JPWO2018079528A1 - Liquid crystal display element - Google Patents

Abstract

The problem to be solved by the present invention is to suppress or prevent the deterioration of the liquid crystal layer due to the deterioration of the light-emitting nanocrystals and the partial irradiation spot of high-energy light. A pair of substrates provided with a first substrate (2) and a second substrate (7) facing each other, and a liquid crystal sandwiched between the first substrate (2) and the second substrate (7) A layer (5), a pixel electrode provided on at least one of the first substrate (2) or the second substrate (7), and the first substrate (2) or the second substrate (7). A common electrode provided in at least one, a color filter (6) composed of a black matrix and three primary color pixel portions of red (R), green (G), and blue (B), and light emission that emits ultraviolet or visible light And an element (L) and a light-emitting nanocrystal that emits light by converting incident light from the light-emitting element (L) into light of at least one of red (R), green (G), and blue (B). An optical conversion unit (103), wherein the liquid crystal layer (5) is represented by the general formula (i) The liquid crystal display element characterized by containing the object 10 to 50 wt%.

Description

  The present invention relates to a liquid crystal display element.

  Due to the excellent display quality, active matrix liquid crystal display devices are put on the market for portable terminals, liquid crystal televisions, projectors, computers and the like. In the active matrix display system, TFT (thin film transistor) or MIM (metal insulator metal) is used for each pixel. In combination with a liquid crystal composition having a high voltage holding ratio, a TN type (twisted nematic) is used. It is widely used as the first general liquid crystal display element. In order to obtain a wider viewing angle characteristic, VA (vertical alignment: vertical alignment), IPS (In Plane Switching), FFS (Fringe Field Switching), which is an improved version of IPS, and the like are used. In order to deal with such display elements, new liquid crystal compounds or liquid crystal compositions have been proposed at present.

On the other hand, since the liquid crystal display element is not a self-luminous type, a light source for emitting light is essential, and a white light source having an emission spectrum in a color reproduction region required for a display is used. As the light source, a cold cathode tube, a white LED (light emitting diode), or the like is used. From the viewpoint of light emission efficiency, at present, the white LED is mainly used. LEDs cannot currently cover the entire visible light range from 380 nm to 750 nm with a single element, and several forms are known for obtaining white light.
1) Combination of blue LED and yellow phosphor 2) Combination of three primary color LEDs (red, green and blue) 3) Combination of near ultraviolet or purple LED and red, green and blue phosphor Among these three methods, From the viewpoint of obtaining white light optimal as a light source for a liquid crystal display element, 3) is the best, and 2) and 1) are in order, and from the viewpoint of luminous efficiency, 1) is the best.

  In a liquid crystal display element, it is important to reduce power consumption. In order to respond to a power saving program that is being studied by advanced countries, the light emission efficiency of a light source is emphasized. Therefore, at present, white light is obtained by the combination of 1) blue LED and yellow phosphor.

  Although this method is excellent in light emission efficiency, it has poor characteristics as a white light source such as lack of red light, and has a problem in color reproducibility. In particular, liquid crystal display elements use color filters in combination with liquid crystal elements to realize color display, so it is difficult to improve color reproducibility even if the light source section is improved. It has been necessary to increase the color purity by increasing the pigment concentration in the color filter or by increasing the color film thickness. However, in this case, there is a problem in that the transmittance decreases and the amount of light must be increased, resulting in an increase in power consumption.

  Therefore, as a technique for simultaneously solving the color reproducibility and the light emission efficiency of the liquid crystal display element, a quantum dot technique (see Patent Document 1), which is an example of a nanocrystal for light emission, has attracted attention. The quantum dots are composed of semiconductor microcrystals with a particle diameter of several nanometers to several tens of nanometers, and have energy levels discretely due to the confinement effect of electron-hole pairs, and the energy band gap increases as the particle diameter decreases. Have. By applying this property and controlling the particle diameter to make the band gap uniform, a light source with a small half-value width of the emission spectrum can be obtained. Since a wide color gamut display can be realized by obtaining a light source of three primary colors with a small half-value width, it is disclosed that a liquid crystal display element with improved color reproducibility can be configured by using quantum dots as a constituent member of a backlight. (See Patent Document 2 and Non-Patent Document 1). Further, a proposal has been made to use three-color quantum dots in place of conventional color filters by using short-wavelength visible light such as near ultraviolet light or blue light as a light source (see Patent Document 3). In principle, these display elements can achieve both high luminous efficiency and color reproducibility.

JP-T-2001-523758 International Publication No. 2004/074739 Pamphlet U.S. Pat. No. 8,648,524 International Publication No. 2014/045371 Pamphlet

SID 2012 DIGEST, p895-896

  However, as described above, when a white light source of a liquid crystal display element is obtained by using quantum dots, which are examples of light-emitting nanocrystals, interposed in a light-emitting element, an example of light-emitting nanocrystals as shown in FIG. The light from a light source using a quantum dot intervening in the light emitting element has a small half-value width of each of the three primary colors of red (R), green (G), and blue (B), and the specific corresponding to the quantum dot. The wavelength is provided. Therefore, the emission spectrum is significantly different from that of a general white LED (for example, the above 1) to 3)). As a result, the liquid crystal material used as an optical shutter is irradiated with light that emits light from the light-emitting nanocrystals or light from the light-emitting nanocrystals, causing problems such as the liquid crystal material itself being easily decomposed. . For example, Patent Document 4 discloses a technique for optimizing a liquid crystal composition used for a liquid crystal display element using a general white light source and a color filter including three primary colors, but quantum dots, etc. There is no disclosure about maintaining the reliability of a liquid crystal material when a light-emitting nanocrystal is used as a light source.

  In particular, when a white light source is obtained by interposing a luminescent nanocrystal such as a quantum dot, if the luminescent nanocrystal deteriorates over time or due to the external environment, the short wavelength visible light used for the light source High energy rays including light rays and ultraviolet light are not easily absorbed by the light emitting nanocrystals, and the liquid crystal layer is directly irradiated with high energy rays for a long time. This causes problems such as the liquid crystal material constituting the liquid crystal layer being easily decomposed. In the case where the surface of the liquid crystal panel is covered with a film containing a light emitting nanocrystal, or a problem that a high energy ray is exposed to a specific region (spot) due to local absence of the light emitting nanocrystal, Since high energy light from the periphery of the outer extension of the panel leaks, there is a problem that the liquid crystal deteriorates from the portion where the high energy light leaks. In particular, at the edge of the spot or the screen, a partially deteriorated portion is likely to occur, and the partial deterioration is different from the overall deterioration and is easily noticed.

  Therefore, the problem to be solved by the present invention is to suppress or prevent the deterioration of the light emitting nanocrystals and the deterioration of the liquid crystal layer due to the partial irradiation spot of the high energy beam.

  As a result of intensive investigations to solve the above problems, the inventors of the present application use a device including a liquid crystal layer containing a liquid crystal composition containing a specific liquid crystal compound and a light source via a light emitting nanocrystal. Thus, the inventors have found that the above problems can be solved and have completed the present invention.

That is, the present invention includes a pair of substrates provided with a first substrate and a second substrate facing each other,
A liquid crystal layer sandwiched between the first substrate and the second substrate;
A pixel electrode provided on at least one of the first substrate and the second substrate;
A common electrode provided on at least one of the first substrate and the second substrate;
A color filter composed of a black matrix and three primary color pixel portions of red (R), green (G), and blue (B);
A light emitting element that emits ultraviolet or visible light; and
A light conversion unit containing nanocrystals for light emission that converts incident light from the light emitting element into light of at least one of red (R), green (G), and blue (B), and emits light; and
The liquid crystal layer has the general formula (i)

(In the formula, R ¹ and R ² are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 2 carbon atoms. 8 represents an alkenyloxy group, A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group, and n represents 0 or 1). The above-described problems are solved by a liquid crystal display element containing a liquid crystal composition.

  The present invention provides a liquid crystal display element in which display defects due to degradation of light-emitting nanocrystals and partial irradiation spots of high-energy rays are reduced.

  The present invention provides a liquid crystal display element having a wide color reproduction region and high-speed response.

It is a perspective view which shows embodiment of the liquid crystal display element of this invention. It is a perspective view which shows other embodiment of the liquid crystal display element of this invention. It is a schematic diagram of the cross section which cut | disconnected the liquid crystal display element in the II line direction of FIG. 1, and is a figure of an example for showing the structure of the liquid crystal display element used for this embodiment. It is a figure which shows an example of a structure of the light conversion part 103 which concerns on this invention. It is a schematic diagram which shows an example of the light conversion part (especially backlight unit) which concerns on this invention. It is a figure which shows another form of the suitable backlight which concerns on this invention. It is a schematic diagram of the cross section which cut | disconnected the liquid crystal display element in the II line direction of FIG. 1, and is a figure of an example for showing the structure of the liquid crystal display element used by this embodiment. It is a schematic diagram of the cross section which cut | disconnected the liquid crystal display element in the II line direction of FIG. 1, and is a figure of an example for showing the structure of the liquid crystal display element used by this embodiment. It is a schematic diagram of the cross section which cut | disconnected the liquid crystal display element in the II line direction of FIG. 2, and is a figure of an example for showing the structure of the liquid crystal display element used by this embodiment. It is a schematic diagram of the cross section which cut | disconnected the liquid crystal display element in the II line direction of FIG. 2, and is a figure of an example for showing the structure of the liquid crystal display element used by this embodiment. It is the schematic diagram which showed the pixel part of the liquid crystal display element of this invention with the equivalent circuit. It is a schematic diagram which shows an example of the shape of the pixel electrode of this invention. It is a schematic diagram which shows an example of the shape of the pixel electrode of this invention. It is a schematic diagram which shows the electrode structure of the IPS type | mold liquid crystal display element of this invention. It is one of the examples of sectional drawing which cut | disconnected the liquid crystal display element shown in FIG. 1 in the III-III line direction in FIG. It is sectional drawing which cut | disconnected the IPS type | mold liquid crystal panel in the III-III line direction in FIG. It is the top view to which the area | region enclosed by the II line | wire of the electrode layer 3 containing the thin-film transistor formed on the board | substrate in FIG. 2 was expanded. It is sectional drawing which cut | disconnected the liquid crystal display element shown in FIG. 2 in the III-III line direction in FIG. It is a figure which shows the emission spectrum of a quantum dot.

The present invention includes a pair of substrates provided with a first substrate and a second substrate facing each other, a liquid crystal layer sandwiched between the first substrate and the second substrate, the first substrate or A pixel electrode provided on at least one of the second substrates, a common electrode provided on at least one of the first substrate or the second substrate, a black matrix, and red (R), green (G), and blue (B) a color filter composed of the three primary color pixel portions, a light emitting element that emits ultraviolet or visible light, and incident light from the light emitting element among red (R), green (G), and blue (B). A light conversion part containing a light-emitting nanocrystal that emits light by converting to light of at least one color,
The liquid crystal layer has the general formula (i):

(In the formula, R ¹ and R ² are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 2 carbon atoms. 8 represents an alkenyloxy group, A represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group, and n represents 0 or 1). A liquid crystal display element comprising the liquid crystal composition.

  The liquid crystal display element is provided with a light conversion part, so that the color reproduction region is expanded as compared with the conventional liquid crystal display element, and the display defect due to deterioration of the light-emitting nanocrystals and partial irradiation spots of high-energy rays is reduced. I will provide a.

  A preferred liquid crystal display element according to the present invention will be described below with reference to the drawings, and then each component of the liquid crystal display element will be described.

  FIG. 1 is a perspective view showing an entire example of a liquid crystal display element used in the present embodiment, and the components are shown separated for convenience for explanation.

  The liquid crystal display element 1000 according to the present invention includes a backlight unit 100 and a liquid crystal panel 10. The backlight unit 100 includes a light source unit 101 having a light emitting element L and a light guide unit 102 having a light guide plate (not shown). The light conversion unit 103 that converts incident light from the light emitting element L to emit light is provided as a part of the light source unit 101 or the light guide unit 102. Therefore, in FIG. 1, as a case where the light conversion unit 103 is provided in a part of the light source unit 101 for convenience, the light conversion unit 103 is provided as a part of the light guide unit 102. In some cases, the light guide 102 (103) is shown (the same applies to FIG. 2).

  1 and 2, light from the light source unit 101 having the light emitting element L and light from the liquid crystal panel 10 are represented by arrows.

  As shown in FIG. 1, in one form of the backlight 100, a light source unit 101 including a plurality of light emitting elements L is disposed on one side surface of the light guide unit 102. In FIG. The liquid crystal panels 10 are arranged in a line on one side surface. The light source unit 101 including the plurality of light emitting elements L is not only provided on one side surface (one side surface of the light guide unit 102) of the liquid crystal panel 10, but also on the other side surface side (opposite side surfaces) of the liquid crystal panel 10 as necessary. The light source unit 101 including a plurality of light emitting elements L may surround three sides of the light guide unit 102 or the entire periphery of the light guide unit 102 so as to surround the light guide unit 102. As such, it may be provided on four side surfaces. The light guide unit 102 may include a light diffusion plate (not shown) instead of the light guide plate as necessary.

  In the liquid crystal panel 10, the first substrate 2 and the second substrate 7 are sandwiched between a pair of polarizing plates 1 and 8, and a first (transparent insulating) substrate (also referred to as a transparent substrate) disposed oppositely. ) 2 and a second (transparent insulation) substrate 7, and the first (transparent insulation) substrate 2 is disposed on the liquid crystal layer 5 side. An electrode layer 3 is formed on the surface. An alignment layer 4 is provided between the liquid crystal layer 5 and each of the first (transparent insulation) substrate 2 and the second (transparent insulation) substrate 7. Further, in FIG. 1, a color filter 6 is provided between the second substrate 7 and the alignment layer 4.

  In FIG. 1, a pixel electrode (not shown) and a common electrode (not shown) are provided as the electrode layer 3 on the first substrate 2 side. However, in another embodiment, the pixel electrode is a first electrode. The common electrode may be provided on the second substrate 7 while being provided on one substrate 2.

  The alignment layer 4 can align liquid crystal molecules in the liquid crystal composition in a predetermined direction with respect to the recording substrates 2 and 7 when no voltage is applied.

  Although FIG. 1 shows a mode in which the first substrate 2 and the second substrate 7 are sandwiched between a pair of polarizing plates 1 and 8, the position where the polarizing plates 1 and 8 are provided is not limited to this figure. . Further, in FIG. 1, a color filter 6 is provided between the second substrate 7 and the alignment layer 4, but another embodiment of the liquid crystal display element according to the present invention is a so-called color filter on array. The color filter 6 may be provided between the electrode layer 3 and the liquid crystal layer 5, or the color filter may be provided between the electrode layer 3 and the first substrate 2. In addition, if necessary, an overcoat layer (not shown) may be provided so as to cover the color filter layer 6 to prevent a substance contained in the color filter layer from flowing out to the liquid crystal layer.

  Further, in this specification, for convenience of explanation, layers (electrode layer 3 and alignment layer 4 in FIG. 1) formed on the substrate on the backlight unit side and a substrate on the backlight unit side (first substrate 2). Is referred to as a first display substrate SUB1, and the layers (the alignment layer 4 and the color filter 6 in FIG. 1) formed on the substrate facing the backlight unit side substrate and the substrate on the backlight unit side The opposing substrate (second substrate 7) is referred to as a second display substrate SUB2, and, depending on the embodiment, opposes a layer formed on the substrate on the backlight unit side or the substrate on the backlight unit side. What constitutes the layer formed on the substrate may be different. For example, in the form of the liquid crystal display element according to the present invention shown in FIG. 2, the second electrode layer 3 ′ (for example, a common electrode) is provided on the layer provided on the second substrate side of the second display substrate SUB2. Is provided.

  1 to 2, as a preferred embodiment of the liquid crystal display element of the present invention, between the liquid crystal layer 5 and the first substrate 2 and between the liquid crystal layer 5 and the second substrate 7. Although the example in which the alignment layer 4 is formed on each of the first substrate and the second substrate so as to contact the liquid crystal layer 5 is described, the liquid crystal display element of the present invention includes the first substrate 2 or The alignment layer 4 may be formed on at least one of the second substrates 7. For example, when the alignment layer 4 is formed between the liquid crystal layer 5 and the first substrate 2 so as to contact the liquid crystal layer 5 on the first substrate 2, the other liquid crystal layer 5 and the second substrate 2 An alignment film may not be provided between the substrate 7 and the substrate 7.

  That is, the liquid crystal panel 10 according to the present invention includes a first polarizing plate 1, a first substrate 2, an electrode layer 3, an alignment layer 4, a liquid crystal layer 5 containing a liquid crystal composition, and an alignment layer 4. The color filter 6, the second substrate 7, and the second polarizing plate 8 are preferably included in order.

  In FIG. 1, when the light conversion unit 103 that converts incident light from the light emitting element L to emit light is provided in the light source unit 101, the light emitted from the light source unit 101 is converted by the light conversion unit 103. The light emitted from the light source unit 101 is transmitted through the surface of the liquid crystal panel 10 through the light guide unit 102 (for example, a light guide plate).

  On the other hand, when the light conversion unit 103 is provided in the light guide unit 102, after the light emitted from the light emitting element L is converted by the light conversion unit 103, the light guide plate in the light guide unit 102 is used. The converted light attempts to pass through the surface of the liquid crystal panel 10 or the light emitted from the light emitting element L is converted by the light conversion unit 103 after passing through the light guide plate in the light guide unit 102. The transmitted light tends to pass through the surface of the liquid crystal panel 10.

  At this time, the shape of the light guide plate is a flat plate having a side surface whose thickness gradually decreases from the side surface on which the light emitted from the light emitting element L is incident toward the opposing surface (the side surface is tapered or wedge-shaped square). In the case of a plate), the line light can be converted into the surface light, so that the light can easily enter the liquid crystal panel 10. In addition, the line light emitted from the light emitting element L may be converted into surface light by a known means.

  In addition, the light guide unit 102 is preferably provided with a light diffusing plate between the liquid crystal panel 10 and the light guide plate from the viewpoint that light emitted from the light guide plate can be uniformly scattered (described below as an embodiment). To describe).

  FIG. 2 is a perspective view showing the whole of another example of the liquid crystal display element used in the present embodiment, and for convenience of explanation, the constituent elements are shown separated from each other. The liquid crystal display element according to the present invention includes a flat backlight unit 100 and a liquid crystal panel 10. In FIG. 1, the plurality of light emitting elements L are arranged on one side surface of the flat light guide 102. However, in the form of FIG. 2, the plurality of light emitting elements L are flat light guides 102. It is the form arrange | positioned planarly with respect to. In the present embodiment, a direct-type backlight structure in which the light source unit 101 is provided directly below the back surface of the liquid crystal panel 10 is employed. In this structure, the light emitting elements L are arranged substantially evenly with respect to almost the entire back surface of the liquid crystal panel 10.

  In this case, since the light from the light emitting element L is surface light, the shape of the light guide plate may not be tapered unlike FIG.

  Also in FIG. 2, it is preferable that the light guide unit 102 includes a light diffusion plate between the liquid crystal panel 10 and the light guide plate (described below as an embodiment).

  2 includes a first substrate 2 having a first electrode layer 3, a second substrate 7 having a second electrode layer 3 ′ (for example, a common electrode), and the first substrate A liquid crystal composition (or a liquid crystal layer 5) sandwiched between the substrate 2 and the second substrate 7, and the liquid crystal layer 5 and the liquid crystal layer 5 are disposed between the first substrate 2 and the liquid crystal layer 5. An alignment layer 4 provided so as to be in contact with each other, and an alignment layer 4 provided so as to be in contact with the liquid crystal layer 5 between the second substrate 7 and the liquid crystal layer 5 are provided. In addition, a color filter 6 is provided between the second substrate 7 and the second electrode layer 3 ′, and the first substrate 2 and the second substrate 8 include a pair of polarizing plates 1, 8.

  That is, the liquid crystal display element 1000 according to the present invention includes a first polarizing plate 1, a second substrate 20, an electrode layer (also referred to as a thin film transistor layer) 3 including a thin film transistor, a photo-alignment layer 4, and a liquid crystal composition. A layer 5 containing an object, a photo-alignment layer 4, a second electrode layer 3 ', a color filter 6, a first substrate 7, and a first polarizing plate 8 are sequentially laminated. .

  The light conversion unit according to the present invention is preferably provided between the light emitting element side substrate and the light emitting element on either the first substrate or the second substrate. Hereinafter, preferred embodiments and preferred backlight units of the liquid crystal display element according to the present invention will be described with reference to FIGS.

  FIG. 3 shows a liquid crystal display element having a backlight unit in which a plurality of light emitting elements L are arranged in a line on one side surface of the liquid crystal panel 10 and the light conversion unit 103 is provided in a part of the light guide unit 102. FIG. 2 is a cross-sectional view of the liquid crystal display element taken along the line I-I in FIG. 1, and is an example for illustrating the configuration of the liquid crystal display element used in the present embodiment.

  The backlight unit 100 in FIG. 3 includes a light source unit 101 having a light emitting element L attached to one side of the outside of the liquid crystal panel 10 and a light guide unit 102 connected to the light source unit 101. The light guide unit 102 includes a light conversion unit 103 and a light guide plate 104. Here, the light conversion unit 103 includes a light emitting nanocrystal NC that emits light by converting incident light from the light emitting element L into light of at least one of red (R), green (G), and blue (B). To do. Therefore, the liquid crystal display element according to the present invention includes a light source unit 101 including a light emitting element L, a light conversion unit 103 and a light guide plate 104 connected to the light source unit 101, and one surface of the light guide plate 104. The first polarizing plate 1, the first display substrate SUB1, the liquid crystal layer 5, the second display substrate SUB2, and the second polarizing plate 8 are laminated in this order. Thus, in the present embodiment, the light conversion unit 103 is provided in a part of the light guide unit 102.

  An example of a preferable form of the liquid crystal display element and the light conversion unit according to the present invention will be described with reference to FIGS. 4, 5, and 6 in combination with FIG.

  FIG. 4 is an example of the light conversion unit 103 according to the present invention. As shown in FIG. 4, the light conversion unit 103 according to the present invention is provided in the inside of a transparent long hollow filling container 111 (in FIG. 4, the tubular filling container 111) (the hollow portion of the hollow body). The nanocrystal NC for light emission is accommodated (or filled). If necessary, in addition to the light-emitting nanocrystal NC, a fluorescent substance or an ultraviolet curable resin may be accommodated (or filled). In FIG. 4, the shape of the surface cut perpendicular to the major axis direction of the filling container 111 is a “0” shape, but the shape of the cross section is not particularly limited.

  A specific manufacturing method will be described in detail later, but the opening at one end of a transparent tubular filling container 111 made of glass, quartz, acrylic, or the like is sealed, and a light emitting nanocrystal NC, for example, a quantum dot, Filling container by injecting a mixture kneaded with ultraviolet curable resin into tube body 111, irradiating with ultraviolet rays to cure the resin, and sealing the other opening of the tube as necessary The light conversion part 103 in which the nanocrystal NC for light emission is sealed in 111 can be formed.

  FIG. 5 is an example of a light conversion unit (particularly a backlight unit) according to the present invention. More specifically, light is emitted inside the light source unit 101 and a transparent long hollow body as shown in FIG. It is a figure which shows the member (light conversion part 103) which accommodated the nanocrystal NC for light, and the light-guide plate 104. FIG. Here, in the embodiment of FIG. 5, the light conversion unit 103 and the light guide plate 104 form the light guide unit 102.

  The light emitting element L of the light source unit 101 is a point light source. Specifically, the light source unit 101 includes a light emitting element L including a light emitting diode 105 (LED). For example, the light-emitting diode 105 is sealed in, for example, a concave container 113 (not shown in FIG. 5, see FIG. 7) and mounted on the light source substrate 110, and the light incident surface (see FIG. In FIG. 5, for example, it is disposed opposite to the left end side surface. Further, as shown in FIG. 5, between the light source unit 101 including the light emitting element L and the light guide plate 104, a tube body (light conversion unit 103) in which the light emitting nanocrystal NC is accommodated is disposed. ing.

  In the light source unit 101, the light source substrate 110 has an elongated rectangular parallelepiped shape, and the light emitting elements L are arranged in a line in the longitudinal direction of the light source substrate 110 (see FIGS. 1 and 5). The light conversion unit 103 connected to the light source unit 101 is a long hollow body similar to the light source substrate 110, and the light emitting nanocrystal NC is accommodated in the transparent long hollow body. It is the structure which was made. Furthermore, since the light guide plate 104 is connected to the light conversion unit 103, the light from the light source unit 101 is at least one of red (R), green (G), and blue (B) in the light conversion unit 103. And is guided to the light guide plate 104 and enters the liquid crystal panel 10. Here, a light diffusion plate may be provided between the light guide plate 104 and the first polarizing plate 1. As a result, the light passing through the light guide plate 104 is scattered and supplied to the liquid crystal panel 10, for example, the first polarizing plate 1 as surface light (see FIGS. 3 and 5). Therefore, in this case, the light guide unit 102 includes the light conversion unit 103, the light guide plate 104, and the light diffusion plate.

  The light-emitting element L (or the light-emitting diode 105) according to the present invention is not particularly limited as long as the wavelength region is a wavelength region that is absorbed by the light-emitting nanocrystal included in the light conversion unit, but in the blue region. It preferably has a main emission peak. For example, a light emitting diode having a main light emission peak in a wavelength region of 420 nm to 480 nm (such as a blue light emitting diode having a main light emission peak in a wavelength region of 420 nm to 480 nm) can be suitably used. A known light emitting diode having a main light emission peak in the blue region can be used. As a light emitting diode having a main light emission peak in a blue region, for example, a seed layer made of AlN formed on a sapphire substrate, an underlayer formed on the seed layer, a laminated semiconductor layer mainly composed of GaN, The thing provided with at least etc. is mentioned as an example. In addition, the laminated semiconductor layer includes a substrate (for example, a layer formed by laminating a base layer, an n-type semiconductor layer, a light emitting layer, and a p-type semiconductor layer in this order from the light source substrate 110 side in FIG. 5).

  Examples of the ultraviolet light source include a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultrahigh-pressure mercury lamp, a carbon arc lamp, an electrodeless lamp, a metal halide lamp, a xenon arc lamp, and an LED. L is preferably an LED that generates ultraviolet light other than the LED having the main emission peak in the wavelength region of 420 nm to 480 nm.

  In this specification, light having an emission center wavelength in the wavelength band of 420 to 480 nm is referred to as blue light, light having an emission center wavelength in the wavelength band of 500 to 560 nm is referred to as green light, and wavelength of 605 to 665 nm. The light having the emission center wavelength in the band is referred to as red light. Further, the ultraviolet light in this specification refers to light having an emission center wavelength in a wavelength band of 300 nm or more and less than 420 nm. Further, in the present specification, the “half-value width” refers to the width of the peak at the peak height ½.

  The light conversion unit 103 converts the wavelength of light from the light emitting element L, and includes a light emitting nanocrystal NC that converts the wavelength of light from the light emitting element L. The nanocrystal for light emission has discrete energy levels, and the emission wavelength can be freely selected by changing the particle diameter of the primary particles of the nanocrystal. Therefore, the color reproduction region is expanded as compared with a conventional light emitting device combining a white LED and a fluorescent material.

  The light conversion unit 103 includes a transparent hollow tube, and one or more types, preferably two types, that absorb light emitted from the light emitting diode 105 in the hollow portion of the hollow tube and emit light having a longer wavelength. It is preferable to include the above-described nanocrystals for light emission NC and a transparent resin containing the light emission nanocrystals NC in a uniformly dispersed state (see FIGS. 4 and 5). In this case, the light emitting nanocrystal NC absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and light emitted from the light emitting diode 105 (for example, blue light). At least one selected from the group consisting of a green light emitting nanocrystal NC that absorbs light and emits green light and a red light emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits red light. It is preferable that the light emitting diode 105 absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and light emitted from the light emitting diode 105 (for example, blue light). Absorbs light (for example, blue light) emitted from the light emitting diode 105 and the green light emitting nanocrystal NC that emits green light by absorbing blue light) It is more preferable to include two kinds of light emitting nanocrystals NC selected from the group consisting of red light emitting nanocrystals NC that emit red light, and absorb light (for example, blue light) emitted from the light emitting diode 105. It is particularly preferable to include a green light-emitting nanocrystal NC that emits green light and a red light-emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light-emitting diode 105 and emits red light.

  Thereby, the spectrum of red light and green light obtained through the light conversion unit has a narrow half-value width and a steep peak. Therefore, the color purity of red light and green light is increased, and the blue light emitted from the light emitting diode 105, the green light emitted from the green phosphor contained in the green light emitting nanocrystal NC, and the red light emitting nanocrystal NC are also included. Since the three primary colors of blue, green, and red are aligned by the red light emitted from the red phosphor, and the color gamut of these combined lights is widened, the color reproduction is better than that of a conventional light emitting device combining a white LED and a fluorescent material. The area is enlarged.

  Further, if necessary, the light conversion unit 103 according to the present invention may include, for example, a fluorescent material in addition to the light emitting nanocrystal NC and the transparent resin containing the light emitting nanocrystal NC in a uniformly dispersed state. Specifically, the light source 101 is preferably light including blue light having a peak at 450 nm, and more preferably a blue light source. The light conversion unit 103 preferably includes a fluorescent material that converts the wavelength of blue light from the light source unit 101 into red light or green light as necessary. Accordingly, the backlight unit can generate light of various colors by combining the red light and the green light that have been wavelength-converted by the light conversion unit 103.

  FIG. 6 is a view showing another embodiment of a preferred backlight according to the present invention, and more specifically, is a modification of the backlight unit of FIG.

  For example, the light emitting diode 105 is sealed in a concave container 113 (not shown in FIG. 6, see FIG. 7) and mounted on the light source substrate 110, and the light incident surface of the light guide plate 104 (in FIG. 6). For example, the left side surface). In addition, as shown in FIG. 6, a tubular body 111 (light conversion unit 103) in which nanocrystals NC for light emission are housed between the light emitting element L and the light guide plate 104 through fixing members 112 a and 112 b. ) Is connected to the light source unit 101.

  Accordingly, the liquid crystal display element according to the present invention is provided with the light conversion unit 103 containing the light-emitting nanocrystals NC in the optical path until the light from the light-emitting element L is supplied to the liquid crystal panel. The unit 103 can emit light obtained by converting incident light from the light emitting element L into light of at least one of red (R), green (G), and blue (B).

  FIG. 7A shows a liquid crystal display having a backlight unit in which a plurality of light emitting elements L are arranged in a line on one side of the liquid crystal panel 10 and a light conversion unit 103 is provided in a part of the light source unit 101. FIG. 2 is a cross-sectional view of the device, in which the liquid crystal display device shown in FIG. Here, the light conversion unit 103 and the light emitting element L attached to one side surface outside the liquid crystal panel 10 are provided in the light source unit 101. Therefore, a suitable backlight unit 100 of the present invention in FIG. 7 includes a light source unit 101 including a light emitting element L provided with a light conversion unit 103, a light guide plate 104, and a light diffusion plate (not shown) if necessary. It is comprised from a light guide part (not shown). Therefore, in the present embodiment, the light conversion unit 103 is included in the light source unit 101. If necessary, a light diffusion plate (not shown) may be provided between the light guide plate 104 and the liquid crystal panel 10 (for example, the polarizing plate 1) so as to contact the light guide plate 104.

  In addition, the light emitting element L includes the light conversion member 103 including the light emitting nanocrystals NC (for example, quantum dots) and the resin (not shown) as the light conversion unit 103, and the light emitting diode 105 as essential components. Is preferred. In other words, the light emitting element L has a configuration in which the light conversion diode 103 covers the light emitting diode 105.

  Therefore, the liquid crystal display element according to this embodiment includes a light source unit 101 including a light emitting element L including a light emitting diode 105 and a light conversion unit 103, a light guide unit 102 including a light guide plate 104, and the light guide plate 104. The first polarizing plate 1, the first display substrate SUB 1, the liquid crystal layer 5, the second display substrate SUB 2, and the second polarizing plate 8 are sequentially stacked on one surface. In the liquid crystal display element, the light source unit 101 having the light emitting element L provided with the light conversion unit 103 and the light guide unit including the light guide plate 104 are connected, and the light source unit 101 is connected to the liquid crystal panel 10. Attached to one external side.

  Moreover, the light emitting element L is comprised by the light emitting diode 105 (LED), and is a point light source. More specifically, the light conversion diode 103 covers the light emitting diode 105. An example of the light emitting element L will be described using an enlarged portion of FIG. 7B. A concave container 113 (transparent filling container) that houses a light emitter having a concave formed on the upper side, and a light source integrated with the container. A substrate 110 (an anode lead portion (not shown) including a lead frame (not shown) and a cathode lead portion (not shown)), a light emitting diode 105 attached to the bottom surface of the concave portion, and a concave portion are provided. And a resin layer containing nanocrystals NC for light emission.

  The light emitting diode 105 is bonded and fixed on the cathode lead portion exposed on the bottom surface of the recess. The light-emitting diode 105 has an n-type electrode and a p-type electrode, and the p-type electrode is connected to the anode lead portion and the n-type electrode is connected to the cathode lead portion through bonding wires. ing. In the light source unit 101 used in the present embodiment, the light emitting diode 105 is attached to the substantially central portion of the bottom surface, but is not particularly limited. Further, since the light source substrate 110 (the anode lead portion and the cathode lead portion, in other words, the lead frame) is a metal plate and a metal conductor such as a copper alloy having a silver plating layer formed on the surface thereof, the transparent filling container The silver plating layers of a part of the anode lead part (conductor part) and a part of the cathode lead part (conductor part) are exposed on the bottom surface of the recess.

  The light emitting diode 105 according to the present invention is not particularly limited in the wavelength region, but preferably has a main light emission peak in the blue region. For example, the light emitting diode 105 having a main light emission peak in a wavelength region of 420 nm or more and 480 nm or less can be suitably used.

  As the light emitting diode 105 having a main light emission peak in the blue region, a known one can be used. As the light emitting diode 105 having a main light emission peak in the blue region, for example, a seed layer made of AlN formed on a sapphire substrate, an underlayer formed on the seed layer, and a laminated semiconductor layer mainly composed of GaN And the like including at least the above. In addition, the laminated semiconductor layer includes a substrate (for example, a layer formed by laminating a base layer, an n-type semiconductor layer, a light emitting layer, and a p-type semiconductor layer in this order from the light source substrate 110 side in FIG. 5).

  The light conversion unit 103 uniformly disperses one or more types, preferably two or more types of light-emitting nanocrystals NC that absorb light emitted from the light-emitting diodes 105 and emit light having a longer wavelength, and light-emitting nanocrystals NC. And a transparent resin that is contained in a state of being allowed to enter. In this case, the light emitting nanocrystal NC absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and light emitted from the light emitting diode 105 (for example, blue light). At least one selected from the group consisting of a green light emitting nanocrystal NC that absorbs light and emits green light and a red light emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits red light. It is preferable that the light emitting diode 105 absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and light emitted from the light emitting diode 105 (for example, blue light). Absorbs light (for example, blue light) emitted from the light emitting diode 105 and the green light emitting nanocrystal NC that emits green light by absorbing blue light) It is more preferable to include two kinds of light emitting nanocrystals NC selected from the group consisting of red light emitting nanocrystals NC that emit red light, and absorb light (for example, blue light) emitted from the light emitting diode 105. It is particularly preferable to include a green light-emitting nanocrystal NC that emits green light and a red light-emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light-emitting diode 105 and emits red light. The red light emitting nanocrystal NC is also excited by the light emitted from the green light emitting nanocrystal NC. Therefore, depending on the ratio of the green and red light emitting nanocrystals NC, the chromaticity of the light output from the light source unit 101 is increased. The movement changes very complexly. For such adjustment of the chromaticity, the light emission wavelength of the light emitting diode 105, the ratio of the green and red light emitting nanocrystals NC, the content of the light emitting nanocrystals NC in the light converting unit 103, and the light converting unit 103 This is related to the shape of the light exit surface from which light is emitted.

  Blue, green light is generated by blue light emitted from the light emitting diode 105, green light emitted from the green phosphor contained in the green light emitting nanocrystal NC, and red light emitted from the red phosphor contained in the red light emitting nanocrystal NC. , The three primary colors of red are available. For this reason, white light is emitted from the light exit surface of the light conversion unit 103. The color reproduction range using white light as the backlight of the liquid crystal display element depends on the wavelength and half width of the main light emission peak of the light emitting diode 105 and the wavelength and half width of the light emission peak of the light emitting nanocrystal NC.

  FIG. 8 shows a liquid crystal display having a backlight unit in which a plurality of light emitting elements L are arranged in a line on one side of the liquid crystal panel 10 and a sheet-like light conversion unit 103 is provided as part of the light guide unit 102. FIG. 2 is a cross-sectional view of the device, in which a liquid crystal display device is cut in the direction of the line I-I in FIG. 1.

  As shown in FIG. 8, the liquid crystal display element of the present embodiment includes a light guide unit including a light guide plate 104 and a light conversion unit 103 including a light emitting nanocrystal NC formed on one surface of the light guide plate 104. 102, the first polarizing plate 1, the first display substrate SUB 1, the liquid crystal layer 5, the second display substrate SUB 2, and the second polarizing plate 8 are sequentially stacked, and one of the light guide plates 104 is stacked. The light source unit 101 is attached to the side surface side. Therefore, in this embodiment, the light conversion unit 103 is included in the light guide unit 102. If necessary, a light diffusing plate may be provided between the light guide plate 104 and the liquid crystal panel 10 (for example, the polarizing plate 1) so as to contact the light guide plate 104.

  Further, the light source unit 101 having the light emitting element L is connected to the light guide plate 104.

  As shown in FIG. 8, the light conversion unit 103 including the light emitting nanocrystals NC has a sheet shape, and in this structure, the light conversion unit 103 is disposed so as to be in contact with almost the entire back surface of the liquid crystal panel 10. Has been. The light conversion unit 103 including the light emitting nanocrystal NC has a structure in which colloidal light emitting nanocrystals are dispersed in a film and sandwiched between protective films. Further, as the light conversion unit 103, one or more types, preferably two or more types of light-emitting nanocrystals NC that absorb the light emitted from the light-emitting diodes 105 and emit light having a longer wavelength, and the light-emitting nanocrystals NC are uniformly formed. And a transparent resin contained in a dispersed state. In this case, the light emitting diode 105 according to the present invention is not particularly limited with respect to the wavelength region as in the other embodiments, but preferably has a main light emission peak in the blue region. For example, the light emitting diode 105 having a main light emission peak in a wavelength region of 420 nm or more and 480 nm or less can be suitably used.

  The light emitting nanocrystal NC absorbs light (for example, blue light) emitted from the light emitting diode 105 and absorbs light (for example, blue light) emitted from the blue light emitting nanocrystal NC that emits blue light. At least one kind of light emitting material selected from the group consisting of a green light emitting nanocrystal NC that emits green light and a red light emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits red light. The nanocrystal NC is preferably included, and the light emitting diode 105 absorbs light (for example, blue light) and emits blue light to emit blue light, and the light emitted from the light emitting diode 105 (for example, blue light). Absorbs light (e.g., blue light) emitted from the green light emitting nanocrystal NC and the light emitting diode 105 that emits green light and emits red light. It is more preferable that two kinds of light emitting nanocrystals NC selected from the group consisting of color light emitting nanocrystals NC are included, and light (for example, blue light) emitted from the light emitting diode 105 is absorbed to emit green light. It is particularly preferable to include a green light emitting nanocrystal NC and a red light emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits red light.

  As shown in FIG. 8, planar blue light that has passed through the light guide plate 104 from the light emitting element L is converted into green light by the green light emitting nanocrystal NC in the light conversion unit 103 including the light emitting nanocrystal NC. The red light emitting nanocrystal NC is preferably converted into red light, and the blue light is preferably transmitted as it is. Therefore, the liquid crystal display element according to the present invention is a planar light source having sharp red, green, and blue peaks, so that the color reproduction region can be expanded and a vivid color can be given to an image.

  FIG. 9 shows a flat backlight unit 100 in which a plurality of light emitting elements L are arranged in a planar shape directly below the back surface of a liquid crystal panel, and a sheet-like light conversion unit 103 is connected to a light guide unit 102. FIG. 3 is an example of a cross-sectional view of the liquid crystal display element having a backlight unit provided in the section, in which the liquid crystal display element is cut in the direction of line II in FIG. 2.

  The backlight unit 100 in this embodiment includes a light source unit 101 in which a plurality of light emitting elements L are arranged in a plane with respect to the light diffusion plate 106 (or the liquid crystal panel 10), the light diffusion plate 106, and the light diffusion plate. And a light guide unit 102 including a light conversion unit 103 including a light-emitting nanocrystal NC provided so as to come into contact with 106. Therefore, in the present embodiment, the light conversion unit 103 is included in the light guide unit 102. The liquid crystal display element in this embodiment includes a light diffusion plate 106 on a light source unit 101 in which a plurality of light emitting elements L are arranged in a plane, and the light conversion unit 103 shown in FIG. And a backlight unit 100 provided with a light conversion unit 103 including a sheet-like nanocrystal for light emission NC. Therefore, the liquid crystal display element according to the present embodiment includes a light source unit 101 in which a plurality of light emitting elements L are arranged in a planar shape, a light diffusion plate 106, and a light conversion nanocrystal NC provided on the light diffusion plate 106. In this structure, the light guide unit 102 including the unit 103, the first polarizing plate 1, the first display substrate SUB1, the liquid crystal layer 5, the second display substrate SUB2, and the second polarizing plate 8 are laminated in this order.

  The light diffusion plate 106 has a role of uniformly scattering light emitted from the light emitting element L.

  As shown in FIG. 9, the light conversion unit 103 including the light-emitting nanocrystals NC is in the form of a sheet, and this structure is similar to that in FIG. A conversion unit 103 is arranged.

  As the light conversion unit 103 in this embodiment, one or more types, preferably two or more types of light-emitting nanocrystals NC that absorb light emitted from the light-emitting diodes 105 and emit light having a longer wavelength, and light-emitting nanocrystals NC. And a transparent resin that is contained in a uniformly dispersed state. In this case, the light emitting diode 105 according to the present invention is not particularly limited with respect to the wavelength region as in the other embodiments, but preferably has a main light emission peak in the blue region. For example, the light emitting diode 105 having a main light emission peak in a wavelength region of 420 nm or more and 480 nm or less can be suitably used.

  The light emitting nanocrystal NC absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and absorbs light emitted from the light emitting diode 105 (for example, blue light) to emit green light. At least one kind of light emitting nanocrystal NC selected from the group consisting of a green light emitting nanocrystal NC that emits light and a red light emitting nanocrystal NC that emits red light by absorbing light (for example, blue light) emitted from the light emitting diode 105. Preferably, the light emitting diode 105 absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light. The blue light emitting nanocrystal NC emits blue light, and the light emitted from the light emitting diode 105 (for example, blue light) absorbs green light. The green light emitting nanocrystals NC and the light emitting diodes 105 absorb red light (for example, blue light) and emit red light. More preferably, the light-emitting diode 105 includes two kinds of light-emitting nanocrystals NC selected from the group consisting of crystal NCs, and absorbs light (for example, blue light) emitted from the light-emitting diode 105 to emit green light. It is particularly preferable to include NC and red-emitting nanocrystal NC that emits red light by absorbing light (for example, blue light) emitted from light-emitting diode 105.

  As shown in FIG. 9, planar light (for example, blue light) diffused from a plurality of light emitting elements L by a light diffusing plate 106 emits green light in a sheet-like light conversion unit 103 including light emitting nanocrystals NC. It is converted into green light by the nanocrystal NC for use, converted to red light by the nanocrystal NC for red light emission, and light (for example, blue light) is transmitted as it is. Therefore, the liquid crystal display element according to the present invention is a planar light source having sharp red, green, and blue peaks, so that the color reproduction region can be expanded and a vivid color can be given to an image.

  FIG. 10 includes a flat backlight unit 100 in which a plurality of light emitting elements L are arranged in a plane directly below the back surface of a liquid crystal panel, and a light conversion unit 103 is provided in a part of the light source unit 101. FIG. 8 is another example of a cross-sectional view of the liquid crystal display element having a backlight unit, taken along the line I-I in FIG.

  The backlight unit 100 in this embodiment includes a light source unit 101 in which a light emitting element L having a light conversion unit 103 including a light emitting nanocrystal NC is arranged in a plane with respect to the light diffusion plate 106 (or the liquid crystal panel 10). And a light guide unit 102 including the light diffusion plate 106. Therefore, in the present embodiment, the light conversion unit 103 is included in the light source unit 101. The liquid crystal display element in this embodiment includes a plurality of light emitting elements L each including a light conversion unit 103 including a light emitting nanocrystal NC, and the plurality of light emitting elements L are arranged in a planar shape. The backlight unit 100 includes a light diffusion plate 106 on the light source unit 101. Further, the light emitting element L having the light conversion part 103 including the light emitting nanocrystal NC has the same structure as the light emitting element L shown in FIG. 7, that is, the light conversion part 103 has a light emitting nanocrystal NC such as a quantum dot. And a light-conversion member containing resin and a light-emitting diode 105.

  Therefore, the liquid crystal display element according to the present invention includes a plurality of light emitting elements L including the light conversion unit 103 including the light emitting nanocrystals NC, and the light source unit 101 in which the plurality of light emitting elements L are arranged in a planar shape. , A light guide unit 102 including a light diffusion plate 106, a first polarizing plate 1, a first display substrate SUB 1, a liquid crystal layer 5, a second display substrate SUB 2, and a second polarizing plate 8. And are stacked in order.

  As in the embodiment shown in FIG. 7, the light emitting diode 105 in the present embodiment is not particularly limited in the wavelength region, but preferably has a main light emission peak in the blue region. For example, the light emitting diode 105 having a main light emission peak in a wavelength region of 420 nm or more and 480 nm or less can be suitably used.

  The light conversion unit 103 uniformly disperses one or more types, preferably two or more types of light-emitting nanocrystals NC that absorb light emitted from the light-emitting diodes 105 and emit light having a longer wavelength, and light-emitting nanocrystals NC. And a transparent resin that is contained in a state of being allowed to enter. In this case, the light emitting nanocrystal NC absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and emits light (for example, blue light) emitted from the light emitting diode 105. At least one selected from the group consisting of a green light emitting nanocrystal NC that absorbs and emits green light and a red light emitting nanocrystal NC that absorbs light (eg, blue light) emitted from the light emitting diode 105 and emits red light It is preferable that the light emitting diode 105 absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits blue light, and light emitted from the light emitting diode 105 (for example, Absorbs light (for example, blue light) emitted from the light emitting diode 105 and the green light emitting nanocrystal NC that emits green light by absorbing blue light) It is more preferable to include two kinds of light emitting nanocrystals NC selected from the group consisting of red light emitting nanocrystals NC that emit red light, and absorb light (for example, blue light) emitted from the light emitting diode 105. It is particularly preferable to include a green light emitting nanocrystal NC that emits green light and a red light emitting nanocrystal NC that absorbs light (for example, blue light) emitted from the light emitting diode 105 and emits red light. The red light emitting nanocrystal NC is also excited by the light emitted from the green light emitting nanocrystal NC. Therefore, depending on the ratio of the green and red light emitting nanocrystals NC, the chromaticity of the light output from the light source unit 101 is increased. The movement changes very complexly. For such adjustment of the chromaticity, the light emission wavelength of the light emitting diode 105, the ratio of the green and red light emitting nanocrystals NC, the content of the light emitting nanocrystals NC in the light converting unit 103, and the light converting unit 103 This is related to the shape of the light exit surface from which light is emitted.

  Blue, green light is generated by blue light emitted from the light emitting diode 105, green light emitted from the green phosphor contained in the green light emitting nanocrystal NC, and red light emitted from the red phosphor contained in the red light emitting nanocrystal NC. , The three primary colors of red are available. For this reason, white light is emitted from the light exit surface of the light conversion unit 103. The color reproduction range using white light as the backlight of the liquid crystal display element depends on the wavelength and half width of the main light emission peak of the light emitting diode 105 and the wavelength and half width of the light emission peak of the light emitting nanocrystal NC.

"LCD panel"
As described above, the layers (electrode layer 3 and alignment layer 4 in FIG. 1) and the backlight unit side substrate (first substrate 2) formed on the backlight unit side substrate are used as the first display substrate SUB1. The layers (the alignment layer 4 and the color filter 6 in FIG. 1) formed on the substrate facing the substrate on the backlight unit side and the substrate facing the substrate on the backlight unit side (second The substrate 7) is referred to as a second display substrate SUB2, and is formed on a layer formed on the substrate on the backlight unit side or on the substrate facing the substrate on the backlight unit side according to the embodiment. What constitutes a layer may be different. Hereinafter, a preferred first display substrate SUB1 (layer formed on the substrate on the backlight unit side and the substrate on the backlight unit side (first substrate 2)) and the second in the liquid crystal display element according to the present invention will be described. Of the display substrate SUB2 (layer formed on the substrate facing the substrate on the backlight unit side and the substrate facing the substrate on the backlight unit side (second substrate 7)), that is, a liquid crystal display element The electrode structure will be described.

  A preferred embodiment of the liquid crystal panel 10 will be described with reference to FIGS. FIG. 11 shows a schematic diagram of a structure diagram of the electrode layer 3 of the liquid crystal display unit. More specifically, FIG. 11 is a schematic diagram showing the pixel portion in an equivalent circuit, and FIGS. 12 and 13 show the shape of the pixel electrode. It is a schematic diagram which shows an example. 12 to 13 are schematic views showing electrode structures of FFS type liquid crystal display elements as an example of the present embodiment. FIG. 14 is a schematic diagram showing an electrode structure of an IPS liquid crystal display element as an example of the present embodiment. Further, FIG. 17 is a schematic diagram showing an electrode structure of a VA liquid crystal display element as an example of this embodiment. As shown in FIGS. 1 and 2, the liquid crystal panel 10 is driven as a liquid crystal display element by providing the backlight unit as illumination means for illuminating the liquid crystal panel 10 from the back side.

  In FIG. 11, the electrode layer 3 according to the present invention includes a common electrode and a plurality of pixel electrodes. The pixel electrode is disposed on the common electrode via an insulating layer (for example, silicon nitride (SiN)). The pixel electrode is disposed for each display pixel, and a slit-shaped opening is formed. The common electrode and the pixel electrode are transparent electrodes formed of, for example, ITO (Indium Tin Oxide), and the electrode layer 3 has a gate bus line GBL (extending along a row in which a plurality of display pixels are arranged in the display portion. GBL1, GBL2,... GBLm), a source bus line SBL (SBL1, SBL2,... SBLm) extending along a column in which a plurality of display pixels are arranged, and a vicinity of a position where the gate bus line and the source bus line intersect In addition, a thin film transistor is provided as a pixel switch. The gate electrode of the thin film transistor is electrically connected to the corresponding gate bus line GBL, and the source electrode of the thin film transistor is electrically connected to the corresponding signal line SBL. Further, the drain electrode of the thin film transistor is electrically connected to the corresponding pixel electrode.

  The electrode layer 3 includes a gate driver and a source driver as driving means for driving a plurality of display pixels, and the gate driver and the source driver are arranged around the liquid crystal display unit. The plurality of gate bus lines are electrically connected to the output terminal of the gate driver, and the plurality of source bus lines are electrically connected to the output terminal of the source driver.

  The gate driver sequentially applies an ON voltage to the plurality of gate bus lines, and supplies the ON voltage to the gate electrode of the thin film transistor electrically connected to the selected gate bus line. Conduction is established between the source and drain electrodes of the thin film transistor in which the ON voltage is supplied to the gate electrode. The source driver supplies an output signal corresponding to each of the plurality of source bus lines. The signal supplied to the source bus line is applied to the corresponding pixel electrode through a thin film transistor in which the source and drain electrodes are electrically connected. The operations of the gate driver and the source driver are controlled by a display processing unit (also referred to as a control circuit) arranged outside the liquid crystal display element.

The display processing unit according to the present invention may have a low frequency driving function and an intermittent driving function for reducing driving power in addition to normal driving, and an LSI for driving a gate bus line of a TFT liquid crystal panel. The operation of the gate driver and the operation of the source driver which is an LSI for driving the source bus line of the TFT liquid crystal panel are controlled. In addition, the common voltage V _COM is supplied to the common electrode to control the operation of the backlight. For example, the display processing unit according to the present invention includes a local dimming unit that divides the entire display screen into a plurality of sections and adjusts the intensity of the backlight light according to the brightness of the image displayed in each section. Also good.

  FIG. 12 is a diagram showing a comb-shaped pixel electrode as an example of the shape of the pixel electrode, and is an enlarged plan view of a region surrounded by the II line of the electrode layer 3 formed on the substrate 2 in FIG. . As shown in FIG. 12, the electrode layer 3 including thin film transistors formed on the surface of the first substrate 2 includes a plurality of gate bus lines 26 for supplying scanning signals and a plurality of gate bus lines 26 for supplying display signals. The source bus lines 25 are arranged in a matrix so as to cross each other. A unit pixel of the liquid crystal display device is formed by a region surrounded by the plurality of gate bus lines 26 and the plurality of source bus lines 25, and a pixel electrode 21 and a common electrode 22 are formed in the unit pixel. ing. A thin film transistor including a source electrode 27, a drain electrode 24, and a gate electrode 28 is provided in the vicinity of the intersection where the gate bus line 26 and the source bus line 25 intersect each other. The thin film transistor is connected to the pixel electrode 21 as a switch element that supplies a display signal to the pixel electrode 21. A common line 29 is provided in parallel with the gate bus line 26. The common line 29 is connected to the common electrode 22 in order to supply a common signal to the common electrode 22.

  A common electrode 22 is formed on the back surface of the pixel electrode 21 with an insulating layer 18 (not shown) interposed therebetween. The shortest separation distance between the adjacent common electrode and the pixel electrode is shorter than the shortest separation distance (cell gap) between the alignment layers. The surface of the pixel electrode is preferably covered with a protective insulating film and an alignment film layer. Note that a storage capacitor 23 for storing a display signal supplied through the source bus line 25 may be provided in a region surrounded by the plurality of gate bus lines 26 and the plurality of source bus lines 25.

  FIG. 13 is a modification of FIG. 12 and shows a slit pixel electrode as an example of the shape of the pixel electrode. The pixel electrode 21 shown in FIG. 13 is formed by cutting out a substantially rectangular flat plate electrode at the center and both ends of the flat plate with a triangular cutout, and the other portions are cut out in a substantially rectangular frame shape. The shape is hollowed out at the part. The shape of the notch is not particularly limited, and a notch having a known shape such as an ellipse, a circle, a rectangle, a rhombus, a triangle, or a parallelogram can be used.

  12 and 13 only show a pair of gate bus lines 26 and a pair of source bus lines 25 in one pixel.

  FIG. 15 is one example of a cross-sectional view of the liquid crystal display element shown in FIG. 1 cut along the line III-III in FIG. 12 or FIG. The first substrate 2 having the alignment layer 4 and the electrode layer 3 including the thin film transistor formed on the surface thereof is separated from the second substrate 7 having the alignment layer 4 formed on the surface so that the alignment layers face each other with a predetermined gap G. This space is filled with a liquid crystal layer 5 containing a liquid crystal composition. The gate insulating film 12, the common electrode 22, the passivation film 18, the flat film 33, the common electrode 22, the insulating film 35, the pixel electrode 21, and the alignment layer 4 are sequentially stacked on a part of the surface of the first substrate 2. . Although FIG. 15 shows an example in which two layers of the passivation film 18 and the flat film 33 are separately provided, one leveling film having both functions of the passivation film 18 and the flat film 33 may be provided.

  A preferred embodiment of the structure of the thin film transistor is, for example, as shown in FIG. 15, provided so as to cover the gate electrode 11 formed on the surface of the substrate 2 and the gate electrode 11 and cover substantially the entire surface of the substrate 2. A gate insulating layer 12, a semiconductor layer 13 formed on the surface of the gate insulating layer 12 so as to face the gate electrode 11, and a protective film provided so as to cover a part of the surface of the semiconductor layer 13 14, a drain electrode 16 provided so as to cover one side end of the protective layer 14 and the semiconductor layer 13 and to be in contact with the gate insulating layer 12 formed on the surface of the substrate 2, and the protection A source electrode 17 which covers the film 14 and the other side end of the semiconductor layer 13 and is in contact with the gate insulating layer 12 formed on the surface of the substrate 2; Has an insulating protective layer 18 provided to cover the electrode 16 and the source electrode 17, a. An anodic oxide film (not shown) may be formed on the surface of the gate electrode 11 for reasons such as eliminating a step with the gate electrode.

  In the embodiment shown in FIGS. 3 and 4, the common electrode 22 is a flat electrode formed on almost the entire surface of the gate insulating layer 12, while the pixel electrode 21 is an insulating protective layer 18 covering the common electrode 22. It is a comb-shaped electrode formed on the top. That is, the common electrode 22 is disposed at a position closer to the first substrate 2 than the pixel electrode 21, and these electrodes are disposed so as to overlap each other via the insulating protective layer 18. The pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material such as ITO (Indium Tin Oxide), IZO (Indium Zinc Oxide), or IZTO (Indium Zinc Tin Oxide). Since the pixel electrode 21 and the common electrode 22 are formed of a transparent conductive material, the area opened by the unit pixel area increases, and the aperture ratio and transmittance increase.

  Further, the pixel electrode 21 and the common electrode 22 have an interelectrode distance (also referred to as a minimum separation distance) R between the pixel electrode 21 and the common electrode 22 in order to form a fringe electric field between these electrodes. It is formed to be smaller than the thickness G of the liquid crystal layer 5 between the first substrate 2 and the second substrate 7. Here, the inter-electrode distance R represents the distance in the horizontal direction on the substrate between the electrodes. In FIG. 12, since the flat common electrode 22 and the comb-shaped pixel electrode 21 are overlapped, an example in which the minimum separation distance (or interelectrode distance): R = 0 is shown, and the minimum separation distance R is The thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 (also referred to as a cell gap): smaller than G, and thus a fringe electric field E is formed. Therefore, the FFS type liquid crystal display element can use a horizontal electric field formed in a direction perpendicular to a line forming the comb shape of the pixel electrode 21 and a parabolic electric field. The electrode width of the comb-shaped portion of the pixel electrode 21: l and the width of the gap of the comb-shaped portion of the pixel electrode 21: m are such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field. It is preferable to form. The minimum separation distance R between the pixel electrode and the common electrode can be adjusted as the (average) film thickness of the gate insulating film 12.

  An example of an IPS liquid crystal display element, which is a modification of the FFS type of the liquid crystal panel of the liquid crystal display element according to the present invention, will be described with reference to FIGS. The configuration of the liquid crystal panel 10 of the IPS type liquid crystal display element is a structure in which an electrode layer 3 (including a common electrode, a pixel electrode, and a TFT) is provided on one substrate as in the FFS type of FIG. First polarizing plate 1, first substrate 2, electrode layer 3, alignment layer 4, liquid crystal layer 5 containing a liquid crystal composition, alignment layer 4, color filter 6, and second substrate 7 And the second polarizing plate 8 are sequentially laminated.

FIG. 13 is an enlarged plan view of a part of the region surrounded by the II line of the electrode layer 3 formed on the first substrate 2 of FIG. 1 in the IPS type liquid crystal display unit. As shown in FIG. 13, in a region surrounded by a plurality of gate bus lines 26 for supplying scanning signals and a plurality of source bus lines 25 for supplying display signals (in a unit pixel), a comb-tooth shape is formed. The first electrode (for example, pixel electrode) 21 and the comb-shaped second electrode (for example, common electrode) 22 are loosely engaged with each other (the two electrodes are spaced apart and meshed with each other while maintaining a certain distance). Is provided). In the unit pixel, a thin film transistor including a source electrode 27, a drain electrode 24, and a gate electrode 28 is provided in the vicinity of an intersection where the gate bus line 26 and the source bus line 25 intersect each other. The thin film transistor is connected to the first electrode 21 as a switch element that supplies a display signal to the first electrode 21. Further, a common line (V _com ) 29 is provided in parallel with the gate bus line 26. The common line 29 is connected to the second electrode 22 in order to supply a common signal to the second electrode 22.

  FIG. 16 is a cross-sectional view of the IPS liquid crystal panel taken along the line III-III in FIG. On the first substrate 2, a gate insulating layer 32 is provided so as to cover the gate bus line 26 (not shown) and to cover substantially the entire surface of the first substrate 2, and on the surface of the gate insulating layer 32. The formed insulating protective layer 31 is provided, and on the insulating protective film 31, a first electrode (pixel electrode) 21 and a second electrode (common electrode) 22 are provided separately. The insulating protective layer 31 is a layer having an insulating function, and is formed of silicon nitride, silicon dioxide, silicon oxynitride film, or the like.

  In the embodiment shown in FIGS. 14 and 16, the first electrode 21 and the second electrode 22 are comb-shaped electrodes formed on the insulating protective layer 31, that is, on the same layer, and are mutually connected. It is provided in a state of being separated and meshed. In the IPS liquid crystal display unit, the interelectrode distance G between the first electrode 21 and the second electrode 22 and the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 ( Cell gap): H satisfies the relationship G ≧ H. The distance between electrodes: G represents the shortest distance in the horizontal direction on the substrate between the first electrode 21 and the second electrode 22. In the example shown in FIGS. 13 and 16, the first electrode 21 is used. And a distance in the vertical direction with respect to a line alternately formed by loosely fitting the second electrode 22. The distance H between the first substrate 2 and the second substrate 7 represents the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7, specifically, the first The distance (namely, cell gap) between the alignment layers 4 (outermost surfaces) provided on each of the substrate 2 and the second substrate 7 and the thickness of the liquid crystal layer are represented.

  On the other hand, in the above-described FFS type liquid crystal display unit, the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 is between the first electrode 21 and the second electrode 22. The IPS liquid crystal display unit is less than the shortest distance in the horizontal direction with respect to the substrate, and the thickness of the liquid crystal layer between the first substrate 2 and the second substrate 7 is the same as that of the first electrode 21 and the second electrode. More than the shortest distance in the horizontal direction with respect to the substrate between the electrodes 22. Therefore, the difference between IPS and FFS does not depend on the positional relationship between the first electrode 21 and the second electrode 22 in the thickness direction.

  The IPS liquid crystal display element drives liquid crystal molecules using an electric field in a horizontal direction with respect to a substrate surface formed between the first electrode 21 and the second electrode 22. The electrode width Q of the first electrode 21 and the electrode width R of the second electrode 22 are preferably formed such that all the liquid crystal molecules in the liquid crystal layer 5 can be driven by the generated electric field.

  Another embodiment of the preferred liquid crystal panel of the present invention is a vertical alignment type liquid crystal display element. FIG. 17 is an enlarged plan view of a region surrounded by the II line of the electrode layer 3 (or also referred to as the thin film transistor layer 3) including the thin film transistor formed on the substrate in FIG. 18 is a cross-sectional view of the liquid crystal display element shown in FIG. 2 taken along the line III-III in FIG. Hereinafter, the vertical alignment type liquid crystal display unit according to the present invention will be described with reference to FIG. 2 and FIGS.

  The configuration of the liquid crystal panel 10 in the liquid crystal display device according to the present invention is a transparent electrode (layer) 3 ′ made of a transparent conductive material (also referred to as a common electrode 3 ′, corresponding to the common electrode 22) as shown in FIG. A first substrate 2 including a pixel substrate and an electrode layer 3 on which a thin film transistor for controlling the pixel electrode included in each pixel is formed; the first substrate 2; A liquid crystal composition (or liquid crystal layer 5) sandwiched between the substrate 7 and the alignment of the liquid crystal molecules in the liquid crystal composition when no voltage is applied is substantially perpendicular to the substrates 2 and 7. A liquid crystal display device is characterized in that the liquid crystal composition of the present invention is used as the liquid crystal composition. As shown in FIG. 18, the first substrate 2 and the second substrate 7 may be sandwiched between a pair of polarizing plates 1 and 8. Further, in FIG. 18, a color filter 6 is provided between the second substrate 7 and the common electrode 3 '. Furthermore, a pair of alignment layers 4 are formed on the surfaces of the transparent electrodes (layers) 3 and 3 ′ so as to be in direct contact with the liquid crystal composition constituting the liquid crystal layer 5 adjacent to the liquid crystal layer 5 according to the present invention. Also good.

  FIG. 17 is a diagram showing an inverted L-shaped pixel electrode as an example of the shape of the pixel electrode, which is surrounded by the II line of the electrode layer 3 (corresponding to the pixel electrode 21) formed on the substrate 2 in FIG. FIG. The pixel electrode is formed in an inverted L shape over substantially the entire area surrounded by the gate bus line 26 and the source bus line 25, as in FIGS. Is not limited.

  Unlike the IPS type and FFS type, the liquid crystal display portion of the vertical alignment type liquid crystal display element is formed with a common electrode 22 (not shown) facing and separating from the pixel electrode 21. In other words, the pixel electrode 21 and the common electrode 22 are formed on different substrates. On the other hand, in the aforementioned FFS or IPS type liquid crystal display element, the pixel electrode 21 and the common electrode 22 are formed on the same substrate.

  Further, the color filter 6 preferably forms a black matrix (not shown) in a portion corresponding to the thin film transistor and the storage capacitor 23 from the viewpoint of preventing light leakage.

  18 is a cross-sectional view of the liquid crystal display element shown in FIG. 2 taken along the line III-III in FIG. That is, the liquid crystal panel 10 of the liquid crystal display element according to the present invention includes a first polarizing plate 1, a first substrate 2, an electrode layer (also referred to as a thin film transistor layer) 3 including a thin film transistor, an alignment layer 4, A layer 5 containing a liquid crystal composition, an alignment layer 4, a common electrode 3 ′, a color filter 6, a second substrate 7, and a first polarizing plate 8 are sequentially stacked. A preferred embodiment of the structure of the thin film transistor (region IV in FIG. 18) of the liquid crystal display element according to the present invention is as described above, and is omitted here.

  The liquid crystal display element according to the present invention may have a local dimming technique for improving the contrast by controlling the luminance of the backlight unit 100 for each of a plurality of sections smaller than the number of liquid crystal pixels.

  As a local dimming method, it is possible to use a plurality of light emitting elements L as light sources for a specific area on the liquid crystal panel and control each light emitting element L according to the luminance of the display area. In this case, the plurality of light emitting elements L may be arranged in a planar shape, or may be arranged in a line on one side of the liquid crystal panel 10.

  In the case of a structure having the light guide portion 102 of the backlight unit 100 and the liquid crystal panel 10 as the local dimming method, the light guide plate (and / or the light diffusing plate) and the substrate on the light source side of the liquid crystal panel In the meantime, the light guide unit 102 may include a control layer that controls the amount of light of the backlight for each specific region smaller than the number of pixels of the liquid crystal.

  As a method for controlling the amount of light of the backlight, a liquid crystal element having fewer than the number of pixels of the liquid crystal may be further included, and various existing methods can be used as the liquid crystal element. An LCD layer containing is preferable in terms of transmittance. The layer containing the (nematic) liquid crystal in which the polymer network is formed (if necessary, the layer containing the (nematic) liquid crystal in which the polymer network is sandwiched between a pair of transparent electrodes) scatters light when the voltage is OFF, In order to transmit light when the voltage is turned on, an LCD layer including a liquid crystal formed with a polymer network partitioned so as to divide the entire display screen into a plurality of partitions, a light guide plate (and / or a light diffusion plate) and a liquid crystal panel Local dimming can be realized by providing it between the substrate on the light source side.

  Hereinafter, the light conversion unit, the liquid crystal layer, and the alignment layer, which are components of the liquid crystal display element according to the present invention, will be described.

  The light conversion part according to the present invention contains light-emitting nanocrystals. As used herein, the term “nanocrystal” preferably refers to a particle having at least one length of 100 nm or less. The shape of the nanocrystal may have any geometric shape and may be symmetric or asymmetric. Specific examples of the shape of the nanocrystal include an elongated shape, a rod shape, a circle shape (spherical shape), an ellipse shape, a pyramid shape, a disk shape, a branch shape, a net shape, or any irregular shape. In some embodiments, the luminescent nanocrystals are preferably quantum dots or quantum rods.

  The light-emitting nanocrystal preferably includes a core including at least one first semiconductor material and a shell that covers the core and includes a second semiconductor material that is the same as or different from the core.

  Therefore, the nanocrystal for light emission according to the present invention includes a core including at least a first semiconductor material and a shell including a second semiconductor material, and the first semiconductor material and the second semiconductor material are the same or different. May be. Further, the core and / or the shell may contain a third semiconductor material other than the first semiconductor and / or the second semiconductor. In addition, what is necessary is just to coat | cover at least one part of a core with the core covering here.

  The light-emitting nanocrystal further includes a core including at least one first semiconductor material, a first shell covering the core and including a second semiconductor material that is the same as or different from the core, and It is preferable to have a second shell that covers the first shell and includes a third semiconductor material that is the same as or different from the first shell.

  Therefore, the nanocrystal for light emission according to the present invention has a form having a core containing a first semiconductor material and a shell covering the core and containing the same second semiconductor material as the core, that is, one type or two An embodiment composed of more than one kind of semiconductor material (= core-only structure (also referred to as core structure)), a core containing a first semiconductor material, and a second semiconductor material that covers the core and is different from the core Including a core / shell structure, a core including a first semiconductor material, and a first shell covering the core and including a second semiconductor material different from the core; Of the three structures of the core / shell / shell structure, the core / shell / shell structure has a second shell that covers the first shell and includes a third semiconductor material different from the first shell. It is preferred to have one Kutomo.

  Further, as described above, the light-emitting nanocrystal according to the present invention preferably includes three forms of a core structure, a core / shell structure, and a core / shell / shell structure. In this case, the core has two or more kinds of semiconductors. A mixed crystal containing a material may be used (for example, CdSe + CdS, CIS + ZnS, etc.). Furthermore, the shell may also be a mixed crystal containing two or more semiconductor materials.

  In the light conversion unit according to the present invention, the light-emitting nanocrystal may have a molecule having affinity for the light-emitting nanocrystal in contact with the light-emitting nanocrystal.

  The above-mentioned molecules having affinity are low molecules and polymers having a functional group having affinity for the nanocrystals for light emission, and the functional group having affinity is not particularly limited. And a group containing one element selected from the group consisting of oxygen, sulfur and phosphorus. Examples include organic sulfur groups, organic phosphate groups pyrrolidone groups, pyridine groups, amino groups, amide groups, isocyanate groups, carbonyl groups, and hydroxyl groups.

  When the light-emitting nanocrystals aggregate, a high-energy light beam is likely to be exposed to a specific region (spot) due to the local absence of the light-emitting nanocrystals.

  The semiconductor material according to the present invention is one selected from the group consisting of II-VI group semiconductors, III-V group semiconductors, I-III-VI group semiconductors, IV group semiconductors, and I-II-IV-VI group semiconductors. Or it is preferable that they are 2 or more types. Preferable examples of the first semiconductor material, the first semiconductor material, and the third semiconductor material according to the present invention are the same as the semiconductor materials described above.

  Specifically, the semiconductor material according to the present invention includes CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, CdSeS, CdSeTe, CdSTe, ZnSeS, ZnSeTe, ZnSTTe, HgSeS, HgSeS, HgSe CdZnS, CdZnSe, CdZnTe, CdHgS, CdHgSe, CdHgTe, HgZnS, HgZnSe, CdHgZnTe, CdZnSeS, CdZnSeTe, CdZnSTe, CdHgSeS, CdHgSeTe AlSb, InN, InP, InAs, InSb, GaNP, GANAS, GaNSb, GaP s, GaPSb, AlNP, AlNAs, AlNSb, AlPAs, AlPSb, InNP, InNAs, InNSb, InPAs, InPSb, GaAlNP, GaAlNAs, GaAlNSb, GaAlPAs, GaAlPSb, GaInNP, GaInNAs, InSPS, GaInPAs InAlPAs, InAlPSb; SnS, SnSe, SnTe, PbS, PbSe, PbTe, SnSeS, SnSeTe, SnSTe, PbSeS, PbSeTe, PbSTe, SnPbS, SnPbSe, SnPbTe, Sn; CuGaSe2, CuInS2, At least one selected from the group consisting of uGaS2, CuInSe2, AgInS2, AgGaSe2, AgGaSe2, C, Si and Ge, and these compound semiconductors may be used alone or in combination of two or more CdS, CdSe, CdTe, ZnS, ZnSe, ZnTe, ZnO, HgS, HgSe, HgTe, InP, InAs, InSb, GaP, GaAs, GaSb, AgInS₂, AgInSe₂, AgInTe₂, AgGaS ₂, AgGaSe₂, AgGaTe₂, CuInS₂, CuInSe₂, CuInTe₂, CuGaS₂, CuGaSe₂, CuGaTe₂, Si, C, Ge and Cu₂ZnSnS₄More preferably, at least one selected from the group consisting of: is selected, and these compound semiconductors may be used alone or in combination of two or more.

  The light emitting nanocrystal according to the present invention is at least selected from the group consisting of a red light emitting nanocrystal that emits red light, a green light emitting nanocrystal that emits green light, and a blue light emitting nanocrystal that emits blue light. It preferably contains one kind of nanocrystal. In general, the emission color of a light-emitting nanocrystal depends on the particle size according to the Schrodinger wave equation of the well-type potential model, but also depends on the energy gap of the light-emitting nanocrystal. The emission color is selected by adjusting the crystal and its particle size.

  In the present invention, the upper limit of the wavelength peak of the fluorescence spectrum of the red light emitting nanocrystal emitting red light is 665 nm, 663 nm, 660 nm, 658 nm, 655 nm, 653 nm, 651 nm, 650 nm, 647 nm, 645 nm, 643 nm, 640 nm, 637 nm, 635 nm. 632 nm or 630 nm, and the lower limit of the wavelength peak is preferably 628 nm, 625 nm, 623 nm, 620 nm, 615 nm, 610 nm, 607 nm or 605 nm.

  In the present invention, the upper limit of the wavelength peak of the fluorescence spectrum of the green light emitting nanocrystal emitting green light is 560 nm, 557 nm, 555 nm, 550 nm, 547 nm, 545 nm, 543 nm, 540 nm, 537 nm, 535 nm, 532 nm or 530 nm. Preferably, the lower limit of the wavelength peak is preferably 528 nm, 525 nm, 523 nm, 520 nm, 515 nm, 510 nm, 507 nm, 505 nm, 503 nm or 500 nm.

  In the present invention, the upper limit of the wavelength peak of the fluorescence spectrum of the blue light emitting nanocrystal emitting blue light is 480 nm, 477 nm, 475 nm, 470 nm, 467 nm, 465 nm, 463 nm, 460 nm, 457 nm, 455 nm, 452 nm or 450 nm. Preferably, the lower limit of the wavelength peak is 450 nm, 445 nm, 440 nm, 435 nm, 430 nm, 428 nm, 425 nm, 422 nm or 420 nm.

  In the present invention, the semiconductor material used for the red light emitting nanocrystal that emits red light preferably has a light emission peak wavelength in the range of 635 nm ± 30 nm. Similarly, the semiconductor material used for the green light emitting nanocrystal that emits green light preferably has a light emission peak wavelength in the range of 530 nm ± 30 nm, and is used for the blue light emitting nanocrystal that emits blue light. The semiconductor material to be used preferably has a light emission peak wavelength in the range of 450 nm ± 30 nm.

  The lower limit of the fluorescence quantum yield of the luminescent nanocrystal according to the present invention is preferably in the order of 40% or more, 30% or more, 20% or more, and 10% or more.

  The upper limit of the full width at half maximum of the fluorescence spectrum of the luminescent nanocrystal according to the present invention is preferably in the order of 60 nm or less, 55 nm or less, 50 nm or less, and 45 nm or less.

The upper limit of the particle size (primary particle) of the nanocrystal for light emission according to the present invention is preferably in the order of 50 nm or less, 40 nm or less, 30 nm or less, and 20 nm or less. The peak wavelength of light emission of the red light emission nanocrystal according to the present invention The upper limit value is 665 nm, and the lower limit value is 605 nm. The compound and its particle size are selected so as to match this peak wavelength. Similarly, the upper limit of the emission peak wavelength of the green light emitting nanocrystal is 560 nm, the lower limit is 500 nm, the upper limit of the emission peak wavelength of the blue light emitting nanocrystal is 480 nm, and the lower limit is 420 nm. The compound and its particle size are selected so as to meet the requirements.

  The light conversion unit according to the present invention includes a light emitting nanocrystal, and the light emitting nanocrystal emits a red light emitting nanocrystal that emits red light, a green light emitting nanocrystal that emits green light, and a blue light. It is preferable to include at least one nanocrystal selected from the group consisting of blue light emitting nanocrystals. Specifically, red (for example, CdSe light-emitting nanocrystals, CdSe rod-shaped light-emitting nanocrystals, rod-shaped light-emitting nanocrystals having a core-shell structure, where the shell portion is CdS and the inner core The part is CdSe, a rod-shaped light emitting nanocrystal having a core-shell structure, the shell part is CdS, the inner core part is ZnSe, and the light-emitting nanocrystal has a core-shell structure, and the shell part is CdS The inner core portion is CdSe, a light emitting nanocrystal having a core-shell structure, and the shell portion is CdS, and the inner core portion is ZnSe, a mixed crystal of CdSe and ZnS, and a light emitting nanocrystal. CdSe and ZnS mixed crystal rod-shaped light-emitting nanocrystals, InP light-emitting nanocrystals, InP light-emitting nanocrystals, InP rod-shaped light-emitting nanocrystals, Mixed crystal luminescent nanocrystals of dSe and CdS, mixed crystal rod-shaped luminescent nanocrystals of CdSe and CdS, mixed crystal luminescent nanocrystals of ZnSe and CdS, mixed crystal rods of ZnSe and CdS Luminescent nanocrystals, etc.), green (CdSe luminescent nanocrystals, CdSe rod-shaped luminescent nanocrystals, CdSe-ZnS mixed crystal luminescent nanocrystals, CdSe-ZnS mixed crystal rod-shaped Luminescent nanocrystals, etc.) and blue (ZnSe luminescent nanocrystals, ZnSe luminescent nanocrystals, ZnS luminescent nanocrystals, ZnS luminescent nanocrystals, luminescent nanocrystals with a core-shell structure) The shell portion is ZnSe, the inner core portion is ZnS, and the rod-shaped light-emitting nanocrystal having a core-shell structure, and the shell portion is ZnSe and the inner portion is ZnSe. Including the core portion ZnS, light emitting nanocrystals CdS, different nanocrystals that emit in the CdS rod light emitting nanocrystals). Other colors (for example, yellow) may be included in the light conversion unit as necessary.

  The particle diameter (primary particle) of the nanocrystal for light emission according to the present invention in the present specification can be measured by TEM observation. In general, examples of the method for measuring the average particle size of nanocrystals include a light scattering method, a sedimentation type particle size measurement method using a solvent, and a method of actually observing particles with an electron microscope and measuring the average particle size. In the present invention, any number of crystals are directly observed with a transmission electron microscope (TEM) or a scanning electron microscope (SEM), and the length of the nanocrystals for light emission is reduced by projection two-dimensional images. A method is preferred in which the particle diameters are calculated from the diameter ratio and the average is obtained. Therefore, in the present invention, the average particle diameter is calculated by applying the above method. The primary particle of the light-emitting nanocrystal is a single crystal having a size of several to several tens of nanometers or a crystallite close thereto, and the size and shape of the primary particle of the light-emitting nanocrystal is the primary particle. It is considered that it depends on the chemical composition, structure, manufacturing method and manufacturing conditions.

  The light conversion part according to the present invention may be mixed with the light-emitting nanocrystals shown above and, if necessary, a resin.

  When the light conversion unit according to the present invention is connected to the light source unit as shown in the embodiment of FIG. 3 and installed on the side surface of the first substrate or the second substrate, the present invention is more specifically described. In the case where the light conversion unit according to the present invention is connected to the light source unit and has a hollow tube and a luminescent nanocrystal housed inside the hollow tube, the luminescent nanocrystal may be mixed with a transparent resin if necessary. Good. As the transparent resin in this case, known ones can be used. For example, acrylic resin, silicone resin, epoxy resin, polyamide resin, polyimide resin, polyester resin, polycarbonate resin, polyether resin, polythioether resin, polyacrylonitrile resin, Examples include polyetheretherketone resins, linear structure and cyclic structure polyolefin resins. The transparent resin is preferably a transparent resin having a total light transmittance of 80% or more in the visible light region (360 nm to 830 nm).

  Further, in the light conversion part according to the present invention, if necessary, in addition to the transparent resin and the light-emitting nanocrystal, scattering of phosphor, polymerization initiator, catalyst, alumina, silica, titanium oxide beads, zeolite, zirconia, etc. A known additive such as an agent may be included.

  The upper limit of the content of the light-emitting nanocrystals with respect to the transparent resin when the light conversion unit according to the present invention is connected to the light source unit and has the hollow tube and the light-emitting nanocrystal housed inside the hollow tube Is preferably 20 parts by weight, preferably 17 parts by weight, preferably 15 parts by weight, and preferably 13 parts by weight with respect to 100 parts by weight of the transparent resin. Preferably, it is 10 parts by weight, preferably 8 parts by weight, preferably 6 parts by weight, preferably 5 parts by weight, and 4.5 parts by weight. Is preferably 4 parts by mass, preferably 3.5 parts by mass, and preferably 3 parts by mass. The lower limit of the content of the light-emitting nanocrystal is preferably 0.05 parts by mass, preferably 0.07 parts by mass, and 0.1 parts by mass with respect to 100 parts by mass of the transparent resin. It is preferably 0.15 parts by mass, preferably 0.2 parts by mass, preferably 0.3 parts by mass, 0.5 parts by mass, and 0.7 parts by mass. Preferably, it is 1 part by mass, preferably 1.2 parts by mass, preferably 1.5 parts by mass, preferably 1.7 parts by mass, and 2 parts by mass. Preferably, it is 2.5 parts by mass, preferably 2.7 parts by mass, and preferably 3 parts by mass. In addition, in the case where a plurality of kinds of light emitting nanocrystals are included in the light conversion portion, the above content represents the total amount.

  When the light conversion unit according to the present invention is integrated with a light-emitting element as shown in the embodiments of FIGS. 7 and 10, more specifically, the light conversion unit according to the present invention includes a light-emitting element and a light-emitting nanocrystal. In the case of providing a light conversion part containing, the nanocrystals for light emission may be used by mixing with a transparent resin if necessary. The transparent resin in this case can use a well-known thing, and since it can use resin similar to the transparent resin of the said Embodiment 1, it abbreviate | omits here. Further, in the light conversion section according to the present invention, the additives added as necessary are the same, and are omitted here.

  The upper limit of the content of the light-emitting nanocrystals with respect to the transparent resin in the case of including the light-emitting element and the light conversion part containing the light-emitting nanocrystals is preferably 25 parts by mass with respect to 100 parts by mass of the transparent resin. It is preferably 23 parts by weight, preferably 20 parts by weight, preferably 17 parts by weight, preferably 15 parts by weight, preferably 13 parts by weight, and 12 parts by weight. Is preferably 10 parts by weight, preferably 8 parts by weight, preferably 6 parts by weight, preferably 5 parts by weight, and preferably 4.5 parts by weight. It is preferably 4 parts by weight, preferably 3.5 parts by weight, and preferably 3 parts by weight. The lower limit of the content of the light-emitting nanocrystal is preferably 0.05 parts by mass, preferably 0.07 parts by mass, and 0.1 parts by mass with respect to 100 parts by mass of the transparent resin. It is preferably 0.15 parts by mass, preferably 0.2 parts by mass, preferably 0.3 parts by mass, preferably 0.5 parts by mass. It is preferably 7 parts by weight, preferably 1 part by weight, preferably 1.2 parts by weight, preferably 1.5 parts by weight, and preferably 1.7 parts by weight. It is preferably 2 parts by mass, preferably 2.5 parts by mass, preferably 2.7 parts by mass, preferably 3 parts by mass, and 3.5 parts by mass. Preferably, it is 4 parts by massIn the case where a plurality of types of light-emitting nanocrystals are included in the light conversion part, the content represents the total amount.

  When the light conversion unit according to the present invention is connected to the light source unit as shown in the embodiment of FIGS. 8 and 9 and installed on the entire surface of the first substrate or the second substrate, the light conversion unit will be described in more detail. The light conversion part according to the present invention is in the form of a sheet, and if disposed on the entire surface of the light source part side of either the first substrate or the second substrate, if necessary, a nanocrystal for light emission May be used by mixing with a transparent resin. The transparent resin in this case can use a well-known thing, and since it can use resin similar to the transparent resin of the said Embodiment 1, it abbreviate | omits here. Further, in the light conversion section according to the present invention, the additives added as necessary are the same, and are omitted here.

  The upper limit of the content of the nanocrystals for light emission with respect to the transparent resin when the light conversion unit according to the present invention is connected to the light source unit and installed on the entire surface of the first substrate or the second substrate is a transparent resin It is preferably 19 parts by mass, preferably 17 parts by mass, preferably 15 parts by mass, preferably 13 parts by mass, and 12 parts by mass with respect to 100 parts by mass. Preferably, it is 10 parts by mass, preferably 8 parts by mass, preferably 6 parts by mass, preferably 5 parts by mass, and preferably 4.5 parts by mass. The mass is preferably 3.5 parts by mass, and preferably 3 parts by mass. The lower limit of the content of the light-emitting nanocrystal is preferably 0.05 parts by mass, preferably 0.07 parts by mass, and 0.1 parts by mass with respect to 100 parts by mass of the transparent resin. It is preferably 0.15 parts by mass and 0.2 parts by mass, preferably 0.3 parts by mass, preferably 0.5 parts by mass, and 0.7 parts by mass. Preferably, it is 1 part by mass, preferably 1.2 parts by mass, preferably 1.5 parts by mass, preferably 1.7 parts by mass, and 2 parts by mass. It is preferably 2.5 parts by mass, 2.7 parts by mass, preferably 3 parts by mass, and preferably 3.5 parts by mass. In the case where a plurality of types of light-emitting nanocrystals are included in the light conversion part, the content represents the total amount.

  Furthermore, in the light conversion part according to the present invention, if necessary, in addition to the transparent resin and the nanocrystal for light emission, a phosphor, a pigment (pigment, dye), a polymerization initiator, a catalyst, alumina, silica, and titanium oxide beads. In addition, known additives such as scattering agents such as zeolite or zirconia may be included.

  Hereinafter, a liquid crystal layer, an alignment film, and the like, which are components of the liquid crystal panel portion of the liquid crystal display element according to the present invention, will be described.

  The liquid crystal layer according to the present invention has the general formula (i):

(In the formula, R ⁱ¹ and R ⁱ² are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 2 carbon atoms. 8 represents an alkenyloxy group, A ⁱ¹ represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group, and n ⁱ¹ represents 0 or 1). % Liquid crystal composition.

  The compound represented by the general formula (i) is preferably a compound selected from the group of compounds represented by the general formulas (i-1) to (i-2).

  The compound represented by general formula (i-1) is the following compound.

(Wherein Rⁱ¹¹And Rⁱ¹²Are each independently R in general formula (i).^L1And R ^L2Means the same. )
  Rⁱ¹¹And Rⁱ¹²Are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms.

  Although the compound represented by general formula (i-1) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  The lower limit of the preferable content is 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, and 10% by mass with respect to the total amount of the composition of the present invention. % By mass, 15% by mass, 20% by mass, 25% by mass, 30% by mass, 35% by mass, 40% by mass, 45% by mass, 50% by mass It is 55 mass%. The upper limit of the preferable content is 95% by mass, 90% by mass, 85% by mass, 80% by mass, 75% by mass, and 70% by mass with respect to the total amount of the composition of the present invention. % By mass, 65% by mass, 60% by mass, 55% by mass, 50% by mass, 45% by mass, 40% by mass, 35% by mass, and 30% by mass And 25% by mass.

When a composition having a low viscosity and a high response speed is required, the lower limit value is high and the upper limit value is preferably high. Moreover, maintaining high T _NI of the compositions of the present invention, it is preferred if good composition temperature stability is required is the upper limit value in the lower limit of the above is moderate is moderate. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the lower limit value is low and the upper limit value is low.

  The compound represented by General Formula (i-1) is preferably a compound selected from the group of compounds represented by General Formula (i-1-1).

( ^Wherein R ⁱ¹² represents the same meaning as in general formula (i-1).)
The compound represented by the general formula (i-1-1) is a compound selected from the compound group represented by the formula (i-1-1.1) to the formula (i-1-1.3). Is preferable, and is preferably a compound represented by formula (i-1-1.2) or formula (i-1-1.3), and particularly represented by formula (i-1-1.3). It is preferable that it is a compound.

  The lower limit of the preferable content of the compound represented by the formula (i-1-1.3) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, and 3% by mass. 5% by mass, 7% by mass, and 10% by mass. The upper limit of the preferable content is 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, and 7% by mass with respect to the total amount of the composition of the present invention. % By mass, 6% by mass, 5% by mass, and 3% by mass.

  The compound represented by General Formula (i-1) is preferably a compound selected from the group of compounds represented by General Formula (i-1-2).

( ^Wherein R ⁱ¹² represents the same meaning as in general formula (i-1).)
The lower limit of the preferable content of the compound represented by the formula (i-1-2) with respect to the total amount of the composition of the present invention is 1% by mass, 5% by mass, and 10% by mass. 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, and 35% by mass. The upper limit of the preferable content is 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, and 40% by mass with respect to the total amount of the composition of the present invention. % By mass, 38% by mass, 35% by mass, 33% by mass, and 30% by mass.

Furthermore, the compound represented by the general formula (i-1-2) is a compound selected from the compound group represented by the formula (i-1-2.1) to the formula (i-1-2.4). It is preferable that it is a compound represented by the formula (i-1-2.2) to the formula (i-1-2.4). In particular, the compound represented by the formula (i-1-2.2) is preferable because the response speed of the composition of the present invention is particularly improved. Further, when obtaining the high _{T NI} than the response speed, it is preferable to use a compound represented by the formula (i-1-2.3) or the formula (i-1-2.4). The content of the compounds represented by formula (i-1-2.3) and formula (i-1-2.4) is not preferably 30% by mass or more in order to improve the solubility at low temperatures. .

  The lower limit of the preferable content of the compound represented by the formula (i-1-2.2) with respect to the total amount of the composition of the present invention is 10% by mass, 15% by mass, and 18% by mass. 20% by mass 23% by mass 25% by mass 27% by mass 30% by mass 33% by mass 35% by mass 38% by mass 40% by mass. The upper limit of the preferable content is 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, and 40% by mass with respect to the total amount of the composition of the present invention. % By mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass, 25% by mass and 22% by mass.

  The lower limit of the preferable total content of the compound represented by the formula (i-1-1.3) and the compound represented by the formula (i-1-2.2) with respect to the total amount of the composition of the present invention The values are 10% by weight, 15% by weight, 20% by weight, 25% by weight, 27% by weight, 30% by weight, 35% by weight, and 40% by weight. . The upper limit of the preferable content is 60% by mass, 55% by mass, 50% by mass, 45% by mass, 43% by mass, and 40% by mass with respect to the total amount of the composition of the present invention. % By mass, 38% by mass, 35% by mass, 32% by mass, 30% by mass, 27% by mass, 25% by mass and 22% by mass.

  The compound represented by General Formula (i-1) is preferably a compound selected from the group of compounds represented by General Formula (i-1-3).

(In the formula, R ⁱ¹³ and R ⁱ¹⁴ each independently represent an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms.)
R ⁱ¹³ and R ⁱ¹⁴ are preferably a linear alkyl group having 1 to 5 carbon atoms and a linear alkoxy group having 1 to 4 carbon atoms.

The lower limit of the preferable content of the compound represented by the formula (i-1-3) with respect to the total amount of the composition of the present invention is 1% by mass, 5% by mass, and 10% by mass. 13% by mass, 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, and 30% by mass. The upper limit of the preferable content is 60% by mass, 55% by mass, 50% by mass, 45% by mass, 40% by mass, and 37% with respect to the total amount of the composition of the present invention. % By mass, 35% by mass, 33% by mass, 30% by mass, 27% by mass, 25% by mass, 23% by mass, 20% by mass, and 17% by mass 15% by mass, 13% by mass, and 10% by mass.
Furthermore, the compound represented by the general formula (i-1-3) is a compound selected from the group of compounds represented by the formula (i-1-3.1) to the formula (i-1-3.12). It is preferable that it is a compound represented by Formula (i-1-3.1), Formula (i-1-3.3), or Formula (i-1-3.4). In particular, the compound represented by the formula (i-1-3.1) is preferable because the response speed of the composition of the present invention is particularly improved. Further, when obtaining the high _{T NI} than the response speed, the formula (i-1-3.3), the formula (i-1-3.4), the formula (L-1-3.11) and formula (i It is preferable to use a compound represented by (1-3.12). Sum of compounds represented by formula (i-1-3.3), formula (i-1-3.4), formula (i-1-3.11) and formula (i-1-3.12) The content of is not preferably 20% by mass or more in order to improve the solubility at low temperatures.

  The lower limit of the preferable content of the compound represented by the formula (i-1-3.1) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, and 3% by mass. 5 mass% 7 mass% 10 mass% 13 mass% 15 mass% 18 mass% 20 mass% The upper limit of the preferable content is 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, and 8% by mass with respect to the total amount of the composition of the present invention. % By mass, 7% by mass, and 6% by mass.

  The compound represented by the general formula (i-1) is preferably a compound selected from the group of compounds represented by the general formula (i-1-4) and / or (i-1-5).

( ^Wherein R ⁱ¹⁵ and R ⁱ¹⁶ each independently represents an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms)
R ⁱ¹⁵ and R ⁱ¹⁶ are preferably a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms. .

  The lower limit of the preferable content of the compound represented by the formula (i-1-4) with respect to the total amount of the composition of the present invention is 1% by mass, 5% by mass, and 10% by mass. 13 mass%, 15 mass%, 17 mass%, and 20 mass%. The upper limit of the preferable content is 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, and 13% by mass with respect to the total amount of the composition of the present invention. % By mass, and 10% by mass.

  The lower limit of the preferable content of the compound represented by the formula (i-1-5) with respect to the total amount of the composition of the present invention is 1% by mass, 5% by mass, and 10% by mass. 13 mass%, 15 mass%, 17 mass%, and 20 mass%. The upper limit of the preferable content is 25% by mass, 23% by mass, 20% by mass, 17% by mass, 15% by mass, and 13% by mass with respect to the total amount of the composition of the present invention. % By mass, and 10% by mass.

  Furthermore, the compounds represented by the general formulas (i-1-4) and (i-1-5) are represented by the formulas (i-1-4.1) to (i-1-5.3). It is preferable that it is a compound chosen from the compound group which is said, and it is preferable that it is a compound represented by Formula (i-1-4.2) or Formula (i-1-5.2).

  The lower limit of the preferable content of the compound represented by the formula (i-1-4.2) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, and 3% by mass. 5 mass% 7 mass% 10 mass% 13 mass% 15 mass% 18 mass% 20 mass% The upper limit of the preferable content is 20% by mass, 17% by mass, 15% by mass, 13% by mass, 10% by mass, and 8% by mass with respect to the total amount of the composition of the present invention. % By mass, 7% by mass, and 6% by mass.

Formula (i-1-1.3), Formula (i-1-2.2), Formula (i-1-3.1), Formula (i-1-3.3), Formula (i-1- 3.4), it is preferable to combine two or more compounds selected from the compounds represented by formula (i-1-3.11) and formula (i-1-3.12). -1.3), formula (i-1-2.2), formula (i-1-3.1), formula (i-1-3.3), formula (i-1-3.4) and It is preferable to combine two or more compounds selected from the compounds represented by formula (i-1-4.2), and the lower limit of the preferable content of the total content of these compounds is the composition of the present invention. 1% by mass, 2% by mass, 3% by mass, 5% by mass, 7% by mass, 10% by mass, 13% by mass, and 15% by mass 18% by mass Yes, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, 33% by mass, 35% by mass, and the upper limit value of the present invention. 80% by mass, 70% by mass, 60% by mass, 50% by mass, 45% by mass, 40% by mass, and 37% by mass with respect to the total amount of the composition of , 35% by mass, 33% by mass, 30% by mass, 28% by mass, 25% by mass, 23% by mass, and 20% by mass. When emphasizing the reliability of the composition, compounds represented by formula (i-1-3.1), formula (i-1-3.3) and formula (i-1-3.4)) It is preferable to combine two or more compounds selected from the group consisting of formulas (i-1-1.3) and (i-1-2.2) when importance is attached to the response speed of the composition. It is preferable to combine two or more compounds selected from the following compounds.
The compound represented by the general formula (i-1) is preferably a compound selected from the compound group represented by the general formula (i-1-6).

(In the formula, R ⁱ¹⁷ and R ⁱ¹⁸ each independently represent a methyl group or a hydrogen atom.)
The lower limit of the preferable content of the compound represented by the formula (i-1-6) with respect to the total amount of the composition of the present invention is 1% by mass, 5% by mass, and 10% by mass. 15% by mass, 17% by mass, 20% by mass, 23% by mass, 25% by mass, 27% by mass, 30% by mass, and 35% by mass. The upper limit of the preferable content is 60% by mass, 55% by mass, 50% by mass, 45% by mass, 42% by mass, and 40% by mass with respect to the total amount of the composition of the present invention. % By mass, 38% by mass, 35% by mass, 33% by mass, and 30% by mass.

  Furthermore, the compound represented by the general formula (i-1-6) is a compound selected from the compound group represented by the formula (i-1-6.1) to the formula (i-1-6.3). Preferably there is.

  The compound represented by general formula (i-2) is the following compound.

(Wherein Rⁱ²¹And Rⁱ²²Are each independently R in general formula (i).ⁱ¹And R ⁱ²Means the same. )
  Rⁱ²¹Is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R^L22Is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

  Although the compound represented by general formula (i-2) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  When emphasizing solubility at low temperatures, the effect is high when the content is set to be large. On the other hand, when the response speed is important, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  The lower limit of the preferable content of the compound represented by the formula (i-2) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. Mass%, 7 mass%, and 10 mass%. The upper limit of the preferable content is 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, and 7% by mass with respect to the total amount of the composition of the present invention. % By mass, 6% by mass, 5% by mass, and 3% by mass.

  Furthermore, the compound represented by the general formula (i-2) is preferably a compound selected from the group of compounds represented by the formula (i-2.1) to the formula (i-2.6) It is preferable that it is a compound represented by (L-2.1), Formula (i-2.3), Formula (i-2.4), and Formula (i-2.6).

  The composition of the present invention further contains one or more compounds selected from compounds represented by formulas (N-1), (N-2), (N-3) and (N-4). It is preferable to do. These compounds correspond to dielectrically negative compounds (the sign of Δε is negative and the absolute value thereof is greater than 2).

  [In the general formulas (N-1), (N-2), (N-3) and (N-4), R^N11, R^{N 12}, R^N21, R^N22, R^N31, R^N32, R^N41And R^N42Are each independently an alkyl group having 1 to 8 carbon atoms, or one or two or more non-adjacent —CH in an alkyl chain having 2 to 8 carbon atoms.₂A structural moiety having a chemical structure in which-are each independently substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO-, or -OCO-,
  A^N11, A^N12, A^N21, A^N22, A^N31, A^N32, A^N41And A^{N4 2}Each independently
(A) 1,4-cyclohexylene group (one —CH present in this group)₂-Or two or more non-adjacent -CH₂-May be replaced by -O-. )as well as
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
(D) 1,4-cyclohexenylene group
Represents a group selected from the group consisting of: In the groups (a), (b), (c) and (d), the hydrogen atoms in the structure are each independently a cyano group, a fluorine atom. Or it may be substituted with a chlorine atom,
  Z^N11, Z^N12, Z^N21, Z^N22, Z^N31, Z^N32, Z^N41And Z^{N4 2}Each independently represents a single bond, —CH₂CH₂-,-(CH₂)₄-, -OCH₂-, -CH₂O-, -COO-, -OCO-, -OCF₂-, -CF₂O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
  X^N21Represents a hydrogen atom or a fluorine atom, and T^N31Is -CH₂-Represents an oxygen atom and X^N41Is an oxygen atom, a nitrogen atom, or -CH₂-Represents Y^N41Is a single bond or —CH₂-Represents n^N11, N^N12, N^N21, N^N22, N^N31, N^N32, N ^N41And n^N42Each independently represents an integer of 0 to 3,^N11+ N^N12, N^N21+ N^N22And n^N31+ N^N32Are each independently 1, 2 or 3, and A^N11~ A^N32, Z^N11~ Z^N32Are present, they may be the same or different and n^N41+ N^N42Represents an integer of 0 to 3, but A^N41And A^{N 42}, Z^N41And Z^N42When a plurality of are present, they may be the same or different. ]
  The compounds represented by the general formulas (N-1), (N-2), (N-3) and (N-4) are preferably compounds whose Δε is negative and whose absolute value is larger than 2. .

Formula (N-1), (N -2), (N-3) and (N-4) ^{in, R N11, R N12, R} N21, R N22, R N31, R N32, R N41 and ^{R N42} Are each independently preferably an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy group having 2 to 8 carbon atoms, An alkyl group having 1 to 5 atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable, and an alkyl having 1 to 5 carbon atoms Group or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is more preferable, and an alkenyl group having 3 carbon atoms (propenyl group). Especially preferred There.

  Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A linear alkoxy group having 1 to 4 carbon atoms and a linear alkenyl group having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

  The alkenyl group is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure.)

A ^N11 , A ^N12 , A ^N21 , A ^N22 , A ^N31, and A ^N32 are preferably aromatic when it is required to increase Δn independently, and in order to improve the response speed, fat A trans-1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5 -Difluoro-1,4-phenylene group, 2,3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1 , 4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group Preferred, it is more preferable that represents the following structures,

More preferably, it represents a trans-1,4-cyclohexylene group, a 1,4-cyclohexenylene group or a 1,4-phenylene group.

^{Z N11, Z N12, Z N21} , Z N22, Z N31 and ^{Z N32} _-CH 2 each _{independently O -, - CF 2 O -} , - CH 2 CH 2 -, - CF 2 CF 2 - or a single bond preferably represents _{an, -CH 2 O -, - CH} 2 CH 2 - or a single bond is more preferable, _-CH 2 O-or a single bond is particularly preferred.

^XN21 is preferably a fluorine atom.

T ^N31 is preferably an oxygen atom.

n ^N11 + n ^N12 , n ^N21 + n ^N22 and n ^N31 + n ^N32 are preferably 1 or 2, a combination in which n ^N11 is 1 and n ^N12 is 0, a combination in which n ^N11 is 2 and n ^N12 is 0, n ^A combination in which ^N11 is 1 and n ^N12 is 1, a combination in which n ^N11 is 2 and n ^N12 is 1, a combination in which n ^N21 is 1 and n ^N22 is 0, n ^N21 is 2 and n ^N22 is n A combination in which n ^N31 is 1 and n ^N32 is 0, and a combination in which n ^N31 is 2 and n ^N32 is 0 are preferable. n ^N41 + n ^N42 is preferably 0, 1 or 2, and n ^N41 + n ^N42 is more preferably 0.

  The lower limit of the preferable content of the compound represented by the formula (N-1) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30%. % By mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, and 80% by mass. It is. The upper limit of the preferable content is 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, and 35% by mass, 25% by mass and 20% by mass.

  The lower limit of the preferable content of the compound represented by the formula (N-2) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30%. % By mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, and 80% by mass. It is. The upper limit of the preferable content is 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, and 35% by mass, 25% by mass and 20% by mass.

  The lower limit of the preferable content of the compound represented by the formula (N-3) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30%. % By mass, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, and 80% by mass. It is. The upper limit of the preferable content is 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, and 35% by mass, 25% by mass and 20% by mass.

  The lower limit of the preferable content of the compound represented by the formula (N-4) with respect to the total amount of the composition of the present invention is 0.5% by mass, 0.7% by mass, and 1% by mass. 1.5% by mass 2% by mass 2.5% by mass 3% by mass 3.5% by mass 4% by mass 4.5% by mass 5% by mass, 6% by mass, 8% by mass, and 10% by mass. The upper limit of the preferable content is 50% by mass, 45% by mass, 35% by mass, 25% by mass, 15% by mass, 13% by mass, and 12% by mass, 10% by mass and 8% by mass.

In the case where a composition having a low response speed and a high response speed is required, the lower limit value is preferably low and the upper limit value is preferably low. Moreover, maintaining high T _NI of the compositions of the present invention, it is preferred if good composition temperature stability is required a low upper limit lower the lower limit of the above. When it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is increased and the upper limit value is high.

  The liquid crystal composition according to the present invention includes a compound represented by the general formula (N-1), a compound represented by the general formula (N-1), and a compound represented by the general formula (N-1). It is preferable to have a compound represented by the general formula (N-1).

  As a compound represented by general formula (N-1), the compound group represented by the following general formula (N-1a)-(N-1h) can be mentioned.

(In the formula, R ^N11 and R ^N12 represent the same meaning as R ^N11 and R ^N12 in formula (N-1), n ^Na11 represents 0 or 1, n ^Nb11 represents 1 or 2, and n ^Nc11 represents ^Represents 0 or 1, n ^Nd11 represents 1 or 2, n ^Ne11 represents 1 or 2, n ^{Nf1 1} represents 1 or 2, n ^Ng11 represents 1 or 2, A ^Ne11 represents trans-1, ^Represents 4-cyclohexylene group or 1,4-phenylene group, and ^Ng11 represents trans-1,4-cyclohexylene group, 1,4-cyclohexenylene group or 1,4-phenylene group, but at least 1 One represents a 1,4-cyclohexenylene group, and Z ^Ne11 represents a single bond or ethylene, but at least one represents ethylene.)
More specifically, the compound represented by the general formula (N-1) is a compound selected from the compound group represented by the general formulas (N-1-1) to (N-1-21). preferable.

  The composition of the present invention preferably further contains one or more compounds represented by the general formula (J). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

(Wherein R ^J1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^J1 represents 0, 1, 2, 3 or 4;
A ^J1 , A ^J2 and A ^J3 are each independently
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O—).
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) are each independently selected from the group consisting of cyano group, fluorine atom, chlorine atom, methyl group, trifluoromethyl group or trifluoro May be substituted with a methoxy group,
Z ^J1 and Z ^J2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or -C≡C-
When n ^J1 is 2, 3 or 4 and a plurality of A ^J2 are present, they may be the same or different, and n ^J1 is 2, 3 or 4 and a plurality of Z ^J1 is present. If they are the same or different,
X ^J1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )
In the general formula (J), R ^J1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. Group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is further preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

R ^J1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

  Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A linear alkoxy group having 1 to 4 carbon atoms and a linear alkenyl group having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

  The alkenyl group is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dot in each formula represents the carbon atom in the ring structure to which the alkenyl group is bonded.)

A ^J1 , A ^J2 and A ^J3 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic to improve the response speed. 1,4-cyclohexylene group, 1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene It preferably represents a -2,6-diyl group, a decahydronaphthalene-2,6-diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, which are substituted by fluorine atoms It is more preferable to represent the following structure,

It is more preferable to represent the following structure.

Z ^J1 and Z ^J2 each independently preferably represent —CH ₂ O—, —OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond, OCH ₂ —, —CF ₂ O—, —CH ₂ CH ₂ — or a single bond is more preferable, and —OCH ₂ —, —CF ₂ O— or a single bond is particularly preferable.

X ^J1 is preferably a fluorine atom or a trifluoromethoxy group, and more preferably a fluorine atom.

n ^J1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and 1 or 2 when emphasizing _TNI. preferable.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

  In the composition of the present invention, the content of the compound represented by the general formula (J) is low temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the general formula (J) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30% by mass. %, 40% by mass, 50% by mass, 55% by mass, 60% by mass, 65% by mass, 70% by mass, 75% by mass, 80% by mass is there. The upper limit of the preferable content is, for example, 95% by mass, 85% by mass, 75% by mass, and 65% by mass with respect to the total amount of the composition of the present invention. , 55% by mass, 45% by mass, 35% by mass, and 25% by mass.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Moreover, maintaining high T _NI of the compositions of the present invention, when temperature stability good composition is required for lowering the lower limit of the above, it is preferable to set the upper limit to lower. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

R ^J1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

  As the compound represented by the general formula (J), a compound represented by the general formula (M) and a compound represented by the general formula (K) are preferable.

(Wherein R ^M1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^M1 represents 0, 1, 2, 3 or 4;
A ^M1 and A ^M2 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═).
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^M1 and Z ^M2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or -C≡C-
When n ^M1 is 2, 3 or 4 and a plurality of A ^M2 are present, they may be the same or different, and n ^M1 is 2, 3 or 4 and a plurality of Z ^M1 is present If they are the same or different,
X ^M1 and X ^M3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^M2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )

(In the formula, R ^K1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^K1 represents 0, 1, 2, 3 or 4;
A ^K1 and A ^K2 are each independently
(A) 1,4-cyclohexylene group (this is present in the group one -CH ₂ - or nonadjacent two or more -CH ₂ - may be replaced by -O- or -S- And (b) 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═).
A hydrogen atom on the group (a) and the group (b) may be independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^K1 and Z ^K2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or -C≡C-
When n ^K1 is 2, 3 or 4 and a plurality of A ^K2 are present, they may be the same or different, and n ^K1 is 2, 3 or 4 and a plurality of Z ^K1 is present If they are the same or different,
X ^K1 and X ^K3 each independently represent a hydrogen atom, a chlorine atom or a fluorine atom,
X ^K2 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. )
The composition of the present invention preferably further contains one or more compounds represented by the general formula (M). These compounds correspond to dielectrically positive compounds (Δε is greater than 2).

In formula (M), R ^M1 represents an alkyl group having 1 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, or an alkenyloxy having 2 to 8 carbon atoms. Group is preferable, an alkyl group having 1 to 5 carbon atoms, an alkoxy group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms or an alkenyloxy group having 2 to 5 carbon atoms is preferable. An alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms is more preferable, an alkyl group having 2 to 5 carbon atoms or an alkenyl group having 2 to 3 carbon atoms is further preferable, and an alkenyl group having 3 carbon atoms. (Propenyl group) is particularly preferred.

R ^M1 is preferably an alkyl group when emphasizing reliability, and is preferably an alkenyl group when emphasizing a decrease in viscosity.

  Further, when the ring structure to which it is bonded is a phenyl group (aromatic), a linear alkyl group having 1 to 5 carbon atoms, a linear alkoxy group having 1 to 4 carbon atoms, and carbon An alkenyl group having 4 to 5 atoms is preferable, and when the ring structure to which the alkenyl group is bonded is a saturated ring structure such as cyclohexane, pyran and dioxane, a linear alkyl group having 1 to 5 carbon atoms, a straight chain A linear alkoxy group having 1 to 4 carbon atoms and a linear alkenyl group having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

  The alkenyl group is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dot in each formula represents the carbon atom in the ring structure to which the alkenyl group is bonded.)

A ^M1 and A ^M2 are preferably aromatic when it is required to independently increase Δn, and are preferably aliphatic to improve the response speed, and trans-1,4 -Cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group, 2, 3-difluoro-1,4-phenylene group, 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6- It preferably represents a diyl group, decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, and more preferably represents the following structure:

It is more preferable to represent the following structure.

Z ^M1 and ^{Z M2} each _{independently -CH 2 O -, - CF 2} O -, - CH 2 CH 2 -, - CF 2 CF 2 - or preferably a single bond, _-CF 2 O-, —CH ₂ CH ₂ — or a single bond is more preferable, and —CF ₂ O— or a single bond is particularly preferable.

n ^M1 is preferably 0, 1, 2 or 3, preferably 0, 1 or 2, preferably 0 or 1 when emphasizing the improvement of Δε, and 1 or 2 when emphasizing T _NI preferable.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It uses combining according to desired performance, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. For example, in one embodiment of the present invention, there are one kind, two kinds, and three kinds of compounds to be used. Furthermore, in another embodiment of the present invention, there are four types, five types, six types, and seven or more types.

  In the composition of the present invention, the content of the compound represented by the general formula (M) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (M) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30% by mass. 40% by mass 50% by mass 55% by mass 60% by mass 65% by mass 70% by mass 75% by mass 80% by mass . The upper limit of the preferable content is, for example, 95% by mass, 85% by mass, 75% by mass, and 65% by mass with respect to the total amount of the composition of the present invention. , 55% by mass, 45% by mass, 35% by mass, and 25% by mass.

When a composition having a low viscosity and a high response speed is required, it is preferable to lower the lower limit value and lower the upper limit value. Moreover, maintaining high T _NI of the compositions of the present invention, when temperature stability good composition is required for lowering the lower limit of the above, it is preferable to set the upper limit to lower. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable to increase the upper limit value while increasing the lower limit value.

  The liquid crystal composition of the present invention preferably further contains one or more compounds represented by the general formula (L). The compound represented by the general formula (L) corresponds to a dielectrically neutral compound (Δε value is −2 to 2).

(Wherein, R ^L1 and R ^L2 each independently represent an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently May be substituted by —CH═CH—, —C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^L1 represents 0, 1, 2 or 3,
A ^L1 , A ^L2 and A ^L3 each independently represent (a) a 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more —CH ₂ — not adjacent to each other). May be replaced by -O-) and (b) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = are -N May be replaced by =.)
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
The group (a), the group (b) and the group (c) may be each independently substituted with a cyano group, a fluorine atom or a chlorine atom,
Z ^L1 and Z ^L2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —OCF _2. —, —CF ₂ O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
When n ^L1 is 2 or 3, and a plurality of A ^L2 are present, they may be the same or different, and when n ^L1 is 2 or 3, and a plurality of Z ^L2 are present, May be the same or different, but excludes compounds represented by general formulas (N-1), (N-2), (N-3), (J) and (i). )
Although the compound represented by general formula (L) may be used independently, it can also be used in combination. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to desired properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention. Alternatively, in another embodiment of the present invention, there are two types, three types, four types, five types, six types, seven types, eight types, nine types, 10 types, More than types.

  In the composition of the present invention, the content of the compound represented by the general formula (L) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, image sticking, It is necessary to appropriately adjust according to required performance such as dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L) with respect to the total amount of the composition of the present invention is 1% by mass, 10% by mass, 20% by mass, and 30% by mass. 40% by mass 50% by mass 55% by mass 60% by mass 65% by mass 70% by mass 75% by mass 80% by mass . The upper limit of the preferable content is 95% by mass, 85% by mass, 75% by mass, 65% by mass, 55% by mass, 45% by mass, and 35% by mass, 25% by mass.

When a composition having a low viscosity and a high response speed is required, the lower limit value is high and the upper limit value is preferably high. Moreover, maintaining high T _NI of the compositions of the present invention, it is preferable if the temperature stability with good composition is required upper limit higher the lower limit of the above is high. Further, when it is desired to increase the dielectric anisotropy in order to keep the driving voltage low, it is preferable that the above lower limit value is lowered and the upper limit value is low.

When importance is attached to reliability, R ^L1 and R ^L2 are preferably both alkyl groups, and when importance is placed on reducing the volatility of the compound, it is preferably an alkoxy group, and importance is placed on viscosity reduction. In this case, at least one is preferably an alkenyl group.

  The number of halogen atoms present in the molecule is preferably 0, 1, 2 or 3, preferably 0 or 1, and 1 is preferred when importance is attached to compatibility with other liquid crystal molecules.

R ^L1 and R ^L2 are a linear alkyl group having 1 to 5 carbon atoms or a linear alkyl group having 1 to 4 carbon atoms when the ring structure to which R ^L1 is bonded is a phenyl group (aromatic). When the ring structure to which the alkoxy group and the alkenyl group having 4 to 5 carbon atoms are bonded is a saturated ring structure such as cyclohexane, pyran, or dioxane, a straight chain having 1 to 5 carbon atoms is preferable. An alkyl group, a linear alkoxy group having 1 to 4 carbon atoms, and a linear alkenyl group having 2 to 5 carbon atoms are preferable. In order to stabilize the nematic phase, the total of carbon atoms and oxygen atoms, if present, is preferably 5 or less, and is preferably linear.

  The alkenyl group is preferably selected from groups represented by any one of the formulas (R1) to (R5). (The black dots in each formula represent carbon atoms in the ring structure.)

n ^L1 is preferably 0 when importance is attached to the response speed, 2 or 3 is preferred for improving the upper limit temperature of the nematic phase, and 1 is preferred for balancing these. In order to satisfy the properties required for the composition, it is preferable to combine compounds having different values.

A ^L1 , A ^L2, and A ^L3 are preferably aromatic when it is required to increase Δn, and are preferably aliphatic for improving the response speed, and are each independently trans- 1,4-cyclohexylene group, 1,4-phenylene group, 2-fluoro-1,4-phenylene group, 3-fluoro-1,4-phenylene group, 3,5-difluoro-1,4-phenylene group 1,4-cyclohexenylene group, 1,4-bicyclo [2.2.2] octylene group, piperidine-1,4-diyl group, naphthalene-2,6-diyl group, decahydronaphthalene-2,6 -It preferably represents a diyl group or a 1,2,3,4-tetrahydronaphthalene-2,6-diyl group, more preferably represents the following structure,

More preferably, it represents a trans-1,4-cyclohexylene group or a 1,4-phenylene group.

Z ^L1 and Z ^L2 are preferably single bonds when the response speed is important.

  The compound represented by the general formula (L) preferably has 0 or 1 halogen atom in the molecule.

  The compound represented by the general formula (L) is preferably a compound selected from the group of compounds represented by the general formulas (L-3) to (L-8).

  The compound represented by general formula (L-3) is the following compound.

(Wherein R^L31And R^L32Are each independently R in general formula (L).^L1And R ^L2Means the same. )
  R^L31And R^L32Are preferably independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

  Although the compound represented by general formula (L-3) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  The lower limit of the preferable content of the compound represented by the formula (L-3) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. Mass%, 7 mass%, and 10 mass%. The upper limit of the preferable content is 20% by mass, 15% by mass, 13% by mass, 10% by mass, 8% by mass, and 7% by mass with respect to the total amount of the composition of the present invention. % By mass, 6% by mass, 5% by mass, and 3% by mass.

When a high birefringence is obtained, the effect is high when the content is set to be large. On the other hand, when the high _TNI is emphasized, the effect is high when the content is set low. Furthermore, when improving dripping marks and image sticking characteristics, it is preferable to set the content range in the middle.

  The compound represented by general formula (L-4) is the following compound.

(Wherein R^L41And R^L42Are each independently R in general formula (L).^L1And R ^L2Means the same. )
  R^L41Is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R^L42Is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms. )
  Although the compound represented by general formula (L-4) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  In the composition of the present invention, the content of the compound represented by the general formula (L-4) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. % By mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass, 30% by mass It is 35% by mass and 40% by mass. The upper limit of the preferable content of the compound represented by the formula (L-4) with respect to the total amount of the composition of the present invention is 50% by mass, 40% by mass, 35% by mass, and 30%. % By mass, 20% by mass, 15% by mass, 10% by mass, and 5% by mass.

  The compound represented by general formula (L-5) is the following compound.

(Wherein R^L51And R^L52Are each independently R in general formula (L).^L1And R ^L2Means the same. )
  R^L51Is preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms, and R^L52Is preferably an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 4 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.

  Although the compound represented by general formula (L-5) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  In the composition of the present invention, the content of the compound represented by the general formula (L-5) is low-temperature solubility, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

The lower limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, 5 % By mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass, 30% by mass It is 35% by mass and 40% by mass. The upper limit of the preferable content of the compound represented by the formula (L-5) with respect to the total amount of the composition of the present invention is 50% by mass, 40% by mass, 35% by mass, and 30%. The compound represented by General Formula (L-6), which is mass%, 20 mass%, 15 mass%, 10 mass%, and 5 mass%, is the following compound.

(Wherein R^L61And R^L62Are each independently R in general formula (L).^L1And R ^L2Means the same as X^L61And X^L62Each independently represents a hydrogen atom or a fluorine atom. )
  R^L61And R^L62Are each independently preferably an alkyl group having 1 to 5 carbon atoms or an alkenyl group having 2 to 5 carbon atoms.^L61And X^L62It is preferable that one of them is a fluorine atom and the other is a hydrogen atom.

  Although the compound represented by general formula (L-6) can also be used independently, it can also be used in combination of 2 or more compounds. There are no particular restrictions on the types of compounds that can be combined, but they are used in appropriate combinations according to the required properties such as solubility at low temperatures, transition temperatures, electrical reliability, and birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, four kinds, and five kinds or more.

  The lower limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. % By mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, 20% by mass, 23% by mass, 26% by mass, 30% by mass It is 35% by mass and 40% by mass. The upper limit of the preferable content of the compound represented by the formula (L-6) with respect to the total amount of the composition of the present invention is 50% by mass, 40% by mass, 35% by mass, and 30%. % By mass, 20% by mass, 15% by mass, 10% by mass, and 5% by mass. When emphasizing to increase Δn, it is preferable to increase the content, and when emphasizing the precipitation at low temperature, it is preferable to decrease the content.

  The compound represented by general formula (L-7) is the following compound.

(Wherein R^L71And R^L72Are each independently R in the general formula (L).^L1And R^{L 2}Means the same as A^L71And A^L72Are each independently A in general formula (L). ^L2And A^L3Represents the same meaning as A^L71And A^L72The above hydrogen atoms may each independently be replaced by a fluorine atom, and Z^L71Is Z in the general formula (L)^L2Means the same as X^L71And X^L72Each independently represents a fluorine atom or a hydrogen atom. )
  Where R^L71And R^L72Are preferably independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group having 2 to 5 carbon atoms, or an alkoxy group having 1 to 4 carbon atoms.^L71And A^L72Are each independently preferably a 1,4-cyclohexylene group or a 1,4-phenylene group;^L71And A^L72The above hydrogen atoms may each independently be replaced by a fluorine atom, and Z^L71Is preferably a single bond or COO-, preferably a single bond, X^L71And X^L72Is preferably a hydrogen atom.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, and four kinds.

  In the composition of the present invention, the content of the compound represented by the general formula (L-7) is low temperature solubility, transition temperature, electrical reliability, birefringence index, process suitability, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. % By mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, and 20% by mass. The upper limit of the preferable content of the compound represented by the formula (L-7) with respect to the total amount of the composition of the present invention is 30% by mass, 25% by mass, 23% by mass, and 20%. % By mass, 18% by mass, 15% by mass, 10% by mass, and 5% by mass.

When an embodiment with a high T _NI is desired for the composition of the present invention, it is preferable to increase the content of the compound represented by formula (L-7), and when an embodiment with a low viscosity is desired, It is preferable to reduce the amount.

  The compound represented by general formula (L-8) is the following compound.

(In the formula, R ^L81 and R ^L82 each independently represent the same meaning as R ^L1 and R ^{L 2} in General Formula (L), and A ^L81 has the same meaning or single bond as A ^L1 in General Formula (L)). The hydrogen atom on A ^L81 may be independently substituted with a fluorine atom, and X ^{L81 to} X ^L86 each independently represent a fluorine atom or a hydrogen atom.)
^{Wherein, R L81} and ^{R L82} are each independently an alkyl group having 1 to 5 carbon atoms, an alkenyl group or an alkoxy group having 1 to 4 carbon atoms 2 to 5 carbon atoms ^{preferably, A L81} is 1, A 4-cyclohexylene group or a 1,4-phenylene group is preferable, and the hydrogen atoms on A ^L71 and A ^{L 72} may be each independently substituted with a fluorine atom, and the same in the general formula (L-8) On the ring structure, 0 or 1 fluorine atom is preferable, and 0 or 1 fluorine atom is preferable in the molecule.

  Although there is no restriction | limiting in particular in the kind of compound which can be combined, It combines according to performance requested | required, such as solubility at low temperature, transition temperature, electrical reliability, birefringence. The kind of the compound used is, for example, one kind as one embodiment of the present invention, two kinds, three kinds, and four kinds.

  In the composition of the present invention, the content of the compound represented by the general formula (L-8) includes solubility at low temperature, transition temperature, electrical reliability, birefringence, process compatibility, dripping marks, It is necessary to adjust appropriately according to required performance such as image sticking and dielectric anisotropy.

  The lower limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the composition of the present invention is 1% by mass, 2% by mass, 3% by mass, and 5%. % By mass, 7% by mass, 10% by mass, 14% by mass, 16% by mass, and 20% by mass. The upper limit of the preferable content of the compound represented by the formula (L-8) with respect to the total amount of the composition of the present invention is 30% by mass, 25% by mass, 23% by mass, and 20%. % By mass, 18% by mass, 15% by mass, 10% by mass, and 5% by mass.

When an embodiment with a high T _NI is desired for the composition of the present invention, it is preferable to increase the content of the compound represented by formula (L-8), and when an embodiment with a low viscosity is desired It is preferable to reduce the amount.

  Of the compounds represented by general formula (i), general formula (L), (N-1), (N-2), (N-3) and (J) with respect to the total amount of the composition of the present invention. The lower limit of the total preferable content is 80% by mass, 85% by mass, 88% by mass, 90% by mass, 92% by mass, 93% by mass, and 94% by mass. Yes, 95% by mass, 96% by mass, 97% by mass, 98% by mass, 99% by mass, and 100% by mass. The upper limit of preferable content is 100% by mass, 99% by mass, 98% by mass, and 95% by mass. However, from the viewpoint of obtaining a composition having a large absolute value of Δε, any one of the compounds represented by the general formula (N-1), (N-2), (N-3), or (J) is 0. It is preferable that it is mass%.

  When the composition of the present invention is a liquid crystal composition having negative dielectric anisotropy, the compound represented by the general formula (i) and the general formula (L-3) with respect to the total amount of the liquid crystal composition To (L-5) and the compounds represented by general formulas (N-1a), (N-1b), (N-1c), (N-1d) and (N-1h) The lower limit of the preferable total content of at least one compound selected from the group of is 85% by mass, 88% by mass, 90% by mass, 92% by mass, and 93% by mass. Yes, 94% by mass, 95% by mass, 96% by mass, 97% by mass, 98% by mass, 99% by mass and 100% by mass. The upper limit of the preferable content is 100% by mass, 99% by mass, 98% by mass, 97% by mass, 95% by mass, 93% by mass, and 90% by mass.

  The composition of the present invention preferably does not contain a compound having a structure in which oxygen atoms such as a peracid (—CO—OO—) structure are bonded in the molecule.

  In the composition of the present invention, when importance is placed on the reliability and long-term stability of the composition, the content of the compound having a carbonyl group is preferably 5% by mass or less based on the total mass of the composition, The content is more preferably 3% by mass or less, still more preferably 1% by mass or less, and most preferably not substantially contained.

  In the composition of the present invention, when importance is attached to the stability by UV irradiation, the content of the compound substituted with chlorine atoms is preferably 15% by mass or less with respect to the total mass of the composition, preferably 10% by mass. % Or less, preferably 8% by mass or less, more preferably 5% by mass or less, more preferably 3% by mass or less, and still more preferably substantially not contained.

  In the liquid crystal composition having a negative dielectric anisotropy of the present invention, when the ring structure in the molecule has a condensed ring, the number of ring structures other than the condensed ring is preferably 1 or less, and the ring structure other than the condensed ring is 0 or less is more preferable.

  In the composition of the present invention, it is preferable to increase the content of a compound in which all the ring structures in the molecule are 6-membered rings, and the content of the compound in which all the ring structures in the molecule are 6-membered rings The total mass is preferably 80% by mass or more, more preferably 90% by mass or more, still more preferably 95% by mass or more, and substantially all ring structures in the molecule are 6-membered. Most preferably, the composition is composed of only a ring compound.

  In the composition of the present invention, in order to suppress deterioration due to oxidation of the composition, it is preferable to reduce the content of the compound having a cyclohexenylene group as a ring structure, and to reduce the content of the compound having a cyclohexenylene group. It is preferably 10% by mass or less, preferably 8% by mass or less, more preferably 5% by mass or less, and preferably 3% by mass or less, based on the total mass of the composition. More preferably, it does not contain substantially.

In the compositions of the present invention, when emphasizing improvements improve viscosity and T _NI is a compound in which a hydrogen atom with optionally substituted 2-methyl-1,4-diyl group halogen in the molecule The content of the compound having the 2-methylbenzene-1,4-diyl group in the molecule is preferably 10% by mass or less based on the total mass of the composition. 8% by mass or less, preferably 5% by mass or less, more preferably 3% by mass or less, and still more preferably substantially not contained.

  In the composition of the present invention, when reliability is particularly important, the content of the compound having an alkenyl group with respect to the total amount of the liquid crystal composition is preferably 50% by mass or less, preferably 40% by mass or less, and 30% by mass. % Or less, preferably 25% by weight or less, preferably 20% by weight or less, preferably 17% by weight or less, preferably 15% by weight or less, preferably 12% by weight or less, preferably 10% by weight or less, 8% by weight The following is preferable, 5 mass% or less is preferable, 3 mass% or less is preferable, and 2 mass% or less is preferable.

  In the composition of the present invention, when the reliability is particularly important, the content of the compound having an alkenyl group with respect to the total amount of components having a dielectric anisotropy of neutral (−2 to 2) of the liquid crystal composition is 90 mass% or less, 70 mass% or less, preferably 60 mass% or less, preferably 50 mass% or less, preferably 40 mass% or less, preferably 30 mass% or less, preferably 20 mass% or less, and 15 mass% or less. 10 mass% or less is preferable, 8 mass% or less is preferable, 5 mass% or less is preferable, 4 mass% or less is preferable, 3 mass% or less is preferable, 2 mass% or less is preferable, and 1 mass% or less is preferable. preferable.

  In the present application, the phrase “not substantially contained” means that the substance is not contained except for an unintentionally contained substance.

  When the compound contained in the composition of the first embodiment of the present invention has an alkenyl group as a side chain, when the alkenyl group is bonded to cyclohexane, the alkenyl group has 2 to 5 carbon atoms. When the alkenyl group is bonded to benzene, the alkenyl group preferably has 4 to 5 carbon atoms, and the unsaturated bond of the alkenyl group and benzene are directly bonded. Preferably not.

The average elastic constant (K _AVG ) of the liquid crystal composition used in the present invention is preferably 10 to 25, and the lower limit thereof is preferably 10, preferably 10.5, preferably 11 and preferably 11.5. , 12 is preferable, 12.3 is preferable, 12.5 is preferable, 12.8 is preferable, 13 is preferable, 13.3 is preferable, 13.5 is preferable, 13.8 is preferable, 14 is preferable, 14 .3 is preferred, 14.5 is preferred, 14.8 is preferred, 15 is preferred, 15.3 is preferred, 15.5 is preferred, 15.8 is preferred, 16 is preferred, 16.3 is preferred, 16 .5, 16.8 is preferable, 17 is preferable, 17.3 is preferable, 17.5 is preferable, 17.8 is preferable, and 18 is preferable. 25 is preferable, 24.5 is preferable, 24 is preferable, 23.5 is preferable, 23 is preferable, 22.8 is preferable, 22.5 is preferable, 22.3 is preferable, 22 is preferable, and 21.8 is 21.5 is preferred, 21.3 is preferred, 21 is preferred, 20.8 is preferred, 20.5 is preferred, 20.3 is preferred, 20 is preferred, 19.8 is preferred, 19.5 is preferred 19.3 is preferred, 19 is preferred, 18.8 is preferred, 18.5 is preferred, 18.3 is preferred, 18 is preferred, 17.8 is preferred, 17.5 is preferred, 17.3 is preferred 17 is preferable. When importance is placed on reducing power consumption, it is effective to reduce the amount of light from the backlight, and it is preferable to improve the light transmittance of the liquid crystal display element. For this purpose, the value of K _AVG should be set low. preferable. It is preferable to set a higher value of K _AVG in the case of emphasizing improved response speed.

  The composition of the present invention may contain a polymerizable compound in order to produce a liquid crystal display element such as a PS mode, a lateral electric field type PSA mode, or a lateral electric field type PSVA mode. Examples of the polymerizable compound that can be used include a photopolymerizable monomer that undergoes polymerization by energy rays such as light. The structure has, for example, a liquid crystal skeleton in which a plurality of six-membered rings such as biphenyl derivatives and terphenyl derivatives are connected. Examples thereof include a polymerizable compound. More specifically, the general formula (XX)

(Wherein, X ²⁰¹ and X ²⁰² each independently represent a hydrogen atom or a methyl group,
Sp ²⁰¹ and Sp ²⁰² are each independently a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH ₂ ) _s — (wherein _s represents an integer of 2 to 7, Preferably bonded to an aromatic ring)
Z ²⁰¹ represents —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ —, —CF ₂ CF ₂ —, —CH═. CH—COO—, —CH═CH—OCO—, —COO—CH═CH—, —OCO—CH═CH—, —COO—CH ₂ CH ₂ —, —OCO—CH ₂ CH ₂ —, —CH ₂ CH ₂ —COO—, —CH ₂ CH ₂ —OCO—, —COO—CH ₂ —, —OCO—CH ₂ —, —CH ₂ —COO—, —CH ₂ —OCO—, —CY ¹ ═CY ² — (Wherein Y ¹ and Y ² each independently represents a fluorine atom or a hydrogen atom), —C≡C— or a single bond;
L ²⁰¹ and L ²⁰² are each independently a fluorine atom, an alkyl group having 1 to 8 carbon atoms, or an alkoxy group having 1 to 8 carbon atoms,
M ²⁰¹ represents a 1,4-phenylene group, a trans-1,4-cyclohexylene group or a single bond, and all of the 1,4-phenylene groups in the formula have an arbitrary hydrogen atom as a fluorine atom and a carbon atom number of 1 May be substituted by an alkyl group of ˜8 or an alkoxy group of 1 to 8 carbon atoms, and n201 and n202 are each independently an integer of 0-4. ) Is preferred.

X ²⁰¹ and X ²⁰² are each preferably a diacrylate derivative that represents a hydrogen atom, or a dimethacrylate derivative that has a methyl group, and a compound in which one represents a hydrogen atom and the other represents a methyl group. As for the polymerization rate of these compounds, diacrylate derivatives are the fastest, dimethacrylate derivatives are slow, asymmetric compounds are in the middle, and a preferred embodiment can be used depending on the application. In the PSA display element, a dimethacrylate derivative is particularly preferable.

Sp ²⁰¹ and Sp ²⁰² each independently represent a single bond, an alkylene group having 1 to 8 carbon atoms, or —O— (CH ₂ ) _s —, but in the PSA display element, at least one is a single bond. A compound in which both represent a single bond or one represents a single bond and the other represents an alkylene group having 1 to 8 carbon atoms or —O— (CH ₂ ) _s — is preferable. In this case, the alkyl group of 1-4 is preferable, and 1-4 is preferable for s.

Z ²⁰¹ represents —OCH ₂ —, —CH ₂ O—, —COO—, —OCO—, —CF ₂ O—, —OCF ₂ —, —CH ₂ CH ₂ —, —CF ₂ CF ₂ — or a single bond. Are preferred, —COO—, —OCO— or a single bond is more preferred, and a single bond is particularly preferred.

M ²⁰¹ is an optionally substituted hydrogen atom, a 1,4-phenylene group which may be substituted by a fluorine atom, an alkyl group having 1 to 8 carbon atoms or an alkoxy group having 1 to 8 carbon atoms, trans-1,4- A cyclohexylene group or a single bond is represented, but a 1,4-phenylene group or a single bond is preferred. When C represents a ring structure other than a single bond, Z ²⁰¹ is preferably a linking group other than a single bond. When M ²⁰¹ is a single bond, Z ²⁰¹ is preferably a single bond.

From these points, in general formula (XX), the ring structure between Sp ²⁰¹ and Sp ²⁰² is specifically preferably the structure described below.

In the general formula (XX), when M ²⁰¹ represents a single bond and the ring structure is formed of two rings, it is preferable to represent the following formulas (XXa-1) to (XXa-5), It is more preferable to represent the formula (XXa-3) from (XXa-1), and it is particularly preferable to represent the formula (XXa-1).

(In the formula, both ends shall be bonded to Sp ²⁰¹ or Sp ^202. )
The polymerizable compounds containing these skeletons are optimal for PSA-type liquid crystal display elements because of the alignment regulating power after polymerization, and a good alignment state can be obtained, so that display unevenness is suppressed or does not occur at all.

  From the above, as the polymerizable monomer, general formula (XX-1) to general formula (XX-4) are particularly preferable, and among them, general formula (XX-2) is most preferable.

(In the formula, benzene may be substituted with a fluorine atom, and Sp ²⁰ represents an alkylene group having 2 to 5 carbon atoms.)
When the polymerizable compound is contained in the composition of the present invention, the content is preferably 0.01% by mass to 0.5% by mass, and preferably 0.05% by mass to 0.45% by mass. Preferably, it is 0.07% by mass to 0.4% by mass, preferably 0.08% by mass to 0.35% by mass, and is 0.1% by mass or more and less than 0.3% by mass. It is preferable.

  In the case of adding a monomer to the composition of the present invention, the polymerization proceeds even when no polymerization initiator is present, but may contain a polymerization initiator in order to accelerate the polymerization. Examples of the polymerization initiator include benzoin ethers, benzophenones, acetophenones, benzyl ketals, acylphosphine oxides, and the like.

  The liquid crystal composition according to the present invention preferably contains a spontaneous alignment agent. The spontaneous alignment agent can control the alignment direction of the liquid crystal molecules contained in the liquid crystal composition constituting the liquid crystal layer. It is considered that the alignment direction of the liquid crystal molecules can be controlled by accumulating or adsorbing the components of the spontaneous alignment agent at the interface of the liquid crystal layer. Thereby, when a spontaneous alignment agent is included in the liquid crystal composition, the alignment layer of the liquid crystal panel can be eliminated.

  The content of the spontaneous alignment agent in the liquid crystal composition according to the present invention is preferably 0.1 to 10% by mass in the whole liquid crystal composition. Further, the spontaneous alignment agent in the liquid crystal composition according to the present invention may be used in combination with the polymerizable compound.

  The spontaneous alignment agent has a polar group and a mesogenic group, and preferably has a polymerizable group if necessary.

  The mesogenic group means a group capable of inducing the behavior of the liquid crystal phase, but the surface modifying compound containing the mesogenic group does not necessarily need to exhibit the liquid crystal phase itself. In other words, the “mesogenic group” is a group that easily induces structural order, and typically includes a rigid portion such as a cyclic group such as an aromatic ring. Further, the “liquid crystal phase” herein refers to a phase having both the fluidity of liquid and the anisotropy of crystal, and examples thereof include nematic liquid crystal, smectic liquid crystal, and cholesteric liquid crystal.

  The shape of the mesogenic group and the shape of the molecule of the surface modification compound in the surface modification compound according to the present invention are not particularly limited, and are rod-shaped, disk-shaped, banana-shaped, L-shaped, T-shaped, or cyclodextrin , Inclusion type such as calixarene or cucurbituril, and the like, but a shape capable of inducing liquid crystal phase behavior is more preferable.

  The polymerizable group is preferably represented by the following general formula (P-1) to general formula (P-15).

  The polar group is preferably an atomic group of a polar element having a heteroatom (a state where charges are separated), and includes a heteroatom such as N, O, S, P, B and Si in the structure. It is more preferable that the atomic group is. Further, the polar group according to the present invention may be either a cyclic structure atomic group including a polar element having a hetero atom or a linear or branched structure atomic group including a polar element having a hetero atom.

  In the polar group according to the present invention, the valence of the polar element having the hetero atom is not particularly limited, such as monovalent, divalent, trivalent, etc., and the number of the polar element having the hetero atom is also particularly limited. There is no. Specifically, the polar element having a hetero atom includesNitrogen-containing groups;Cyano group (—CN), primary amino group (—NH₂) Secondary amino group (—NH—), tertiary amino group (—NRR ′; where R and R ′ are alkyl groups), pyridyl group,Oxygen-containing groups;Hydroxyl group (—OH), alkoxy group (—OR; where R is an alkyl group), formyl group (—CHO), carboxyl group (—COOH), ether group (—R)^a‘OR^a‘’ −; Where R^a', R^a″ Represents an alkylene group or an alkenylene group), a ketone group (—R^a'C (= O) R^a‘’ −; Where R ^a', R^a″ Is an alkylene group or alkenylene group), carbonate group (—O—C (═O) —O—), alkoxy (alkenyloxy) carbonyl group (—COOR ″ —; where R ″ is an alkylene group or alkenylene group ), Carbamoyl group (-CONH₂), Ureido group (-NHCONH₂),Phosphorus-containing groupA phosphinyl group (—P (═O) H₂), Phosphate group (—OP (═O) (OH)₂),Boron-containing group; Boric acid group (-B (OH)₂),Sulfur-containing groupA mercapto group (—SH), a sulfide group (—S—), a sulfinyl group (—S (═O) —), a sulfonyl group (—SO);₂-), Sulfonamide group (-SO₂NH₂), Sulfonic acid group (-SO₃It is preferably a partial structure represented by H) or a sulfino group (—S (═O) OH).

  The spontaneous alignment agent is preferably the following general formula (al-1) and / or general formula (al-2).

^{(Wherein, R al1, R al2, Z} al1, Z al2, L al1, L al2, L al3, Sp al1, Sp al2, Sp al3, X al1, X al2, X al3, m al1, m a l2, ^mal3 , ^nal1 , ^nal2 , ^nal3 , ^pal1 , ^pal2 and ^pal3 are each independently of each other,
^Ral1 represents a hydrogen atom, a halogen, a linear, branched or cyclic alkyl having 1 to 20 carbon atoms, in which one or more non-adjacent CH _{2 in the} alkyl group. The group is substituted by —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O— so that the O and / or S atoms are not directly bonded to each other. In addition, one or more hydrogen atoms may be replaced by F or Cl.
R ^al2 represents a group having any of the following partial structures:

  Sp^al1, Sp^al2And Sp^al3Each independently represent an alkyl group having 1 to 12 carbon atoms or a single bond,
  X^al1, X^al2And X^al3Each independently represents an alkyl group, an acrylic group, a methacryl group or a vinyl group,
  Z^al1Are —O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH.₂-, -CH₂O-, -SCH₂-, -CH₂S-, -CF₂O-, -OCF₂-, -CF₂S-, -SCF₂-,-(CH₂)_n ^al-, -CF₂CH₂-, -CH₂CF₂-,-(CF₂)_n ^al-, -CH = CH-, -CF = CF-, -C≡C-, -CH = CH-COO-, -OCO-CH = CH-,-(CR^al3R^al4)_n ^a1-, -CH (-Sp^al1-X^al1)-, -CH₂CH (-Sp^al1-X^al1)-, -CH (-Sp^al1-X^al1) CH (-Sp^al1-X^al1)-
  Z^al2Are each independently a single bond, —O—, —S—, —CO—, —CO—O—, —OCO—, —O—CO—O—, —OCH.₂-, -CH₂O-, -SCH₂-, -CH₂S-, -CF₂O-, -OCF₂-, -CF₂S-, -SCF₂-,-(CH₂) N1-, -CF₂CH₂-, -CH₂CF₂-,-(CF₂)_n ^al-, -CH = CH-, -CF = CF-, -C≡C-, -CH = CH-COO-, -OCO-CH = CH-,-(CR^al3R^al4)_na1-, -CH (-Sp^al1-X^al1)-, -CH₂CH (-Sp^al1-X^al1)-, -CH (-Sp^al1-X^al1) CH (-Sp^al1-X^al1)-
  L^al1, L^al2, L^al3Independently of one another, a hydrogen atom, a fluorine atom, a chlorine atom, a bromine atom, an iodine atom, -CN, -NO₂, -NCO, -NCS, -OCN, -SCN, -C (= O) N (R^al3)₂, -C (= O) R^al3Represents an optionally substituted silyl group having 3 to 15 carbon atoms, an optionally substituted aryl or cycloalkyl group or 1 to 25 carbon atoms, wherein one or more May be replaced by a halogen atom (fluorine atom, chlorine atom)
R above^al3Represents an alkyl group having 1 to 12 carbon atoms;^al4Represents a hydrogen atom or an alkyl group having 1 to 12 carbon atoms;^alRepresents an integer of 1 to 4,
  p^al1, P^al2And p^al3Each independently represents 0 or 1, m ^al1, M^al2And m^al3Each independently represents an integer of 0 to 3;^{a l1}, N^al2And n^al3Each independently represents an integer of 0 to 3. )
  General formula (Al-2):

(Where Zⁱ¹And Zⁱ²Are each independently a single bond, —CH═CH—, —CF═CF—, —C≡C—, —COO—, —OCO—, —OCOO—, —OOCO—, —CF₂O-, -OCF₂-, -CH = CHCOO-, -OCOCH = CH-, -CH₂-CH₂COO-, -OCOCH₂―CH₂-, -CH = C (CH₃) COO-, -OCOC (CH ₃) = CH-, -CH₂-CH (CH₃) COO-, -OCOCH (CH₃-CH₂-, -OCH₂CH₂O— or an alkylene group having 2 to 20 carbon atoms, and one or two or more non-adjacent —CH in the alkylene group₂-May be substituted by -O-, -COO- or -OCO-, provided that Kⁱ¹Is (K-11), at least -CH in the mesogenic group₂-CH₂COO-, -OCOCH₂―CH₂-, -CH = C (CH₃) COO-, -OCOC (CH₃) = CH-, -CH₂-CH (CH₃) COO-, -OCOCH (CH ₃-CH₂-, -OCH₂CH₂Including any one of O-
  A^al21And Aa¹²²Each independently represents a divalent 6-membered ring aromatic group or a divalent 6-membered ring aliphatic group, but is a divalent unsubstituted 6-membered ring aromatic group, divalent unsubstituted 6-membered The cycloaliphatic group or the hydrogen atom in these ring structures is not substituted or substituted with an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, or a halogen atom. Preferred is a divalent unsubstituted 6-membered aromatic group, a group in which a hydrogen atom in the ring structure is substituted with a fluorine atom, or a divalent unsubstituted 6-membered cyclic aliphatic group. Is preferably a 1,4-phenylene group, a 2,6-naphthalene group or a 1,4-cyclohexyl group, which may be substituted by a halogen atom, an alkyl group or an alkoxy group, but at least one substituent is Pⁱ¹-Spⁱ¹Substituted with-
  Zⁱ¹, A^al21And Aa¹²²Each of which may be the same or different from each other,
  Spⁱ¹Preferably represents a linear alkylene group or a single bond having 1 to 18 carbon atoms, more preferably represents a linear alkylene group or a single bond having 2 to 15 carbon atoms, and more preferably 3 carbon atoms. Represents a linear alkylene group or a single bond of ˜12,
  R^al21Is a hydrogen atom, a linear or branched alkyl group having 1 to 20 carbon atoms, a halogenated alkyl group, or Pⁱ¹-Spⁱ¹-Represents -CH in the alkyl group₂-Is preferably -O-, -OCO-, or -COO- (however, -O- is not continuous), more preferably a hydrogen atom or a linear or branched alkyl group having 1 to 18 carbon atoms. Or Pⁱ¹-Spⁱ¹-Represents -CH in the alkyl group₂-Represents -O- or -OCO- (where -O- is not continuous).

K ⁱ¹ represents a substituent represented by the following general formula (K-1) to general formula (K-11),

P ⁱ¹ represents a polymerizable group, and represents a substituent selected from the group represented by the following general formulas (P-1) to (P-15) (in the formula, the black dot at the right end represents a bond). To express.),

When there are a plurality of Z ⁱ¹ , Z ⁱ² , A ^al21 , m ⁱⁱⁱ¹ and / or A ^al22 , they may be the same or different from each other, provided that any one of A ⁱ¹ and A ⁱ² is at least When substituted with one P ⁱ¹ —Sp ⁱ¹ — and K ⁱ¹ is (K-11), Z ⁱⁱ¹ is at least —CH ₂ —CH ₂ COO—, —OCOCH ₂ —CH ₂ —, —CH _{2. -CH (CH 3) COO -,} - OCOCH (CH 3) -CH 2 -, - OCH 2 CH 2 O- wherein either one of,
m ⁱⁱⁱ¹ represents an integer of 1 to 5,
m ⁱⁱⁱ² represents an integer of 1 to 5,
G ⁱ¹ represents a divalent, trivalent or tetravalent branched structure, or a divalent, trivalent or tetravalent aliphatic or aromatic ring structure;
m ⁱⁱⁱ³ represents an integer smaller than the valence of G ⁱ¹ . )
The spontaneous orientation agent according to the present invention is more preferably a compound represented by the following general formula (al-1-1).

(In the above formula, R^bl1Represents a linear alkyl group having 1 to 12 carbon atoms, R ^bl2And R^bl3Each independently represents a hydrogen atom or a linear alkyl group having 1 to 3 carbon atoms;^bl1And L^bl1Each independently represents a hydrogen atom or a linear alkyl group having 1 to 7 carbon atoms. )
  In addition, as a means for eliminating the alignment layer of the liquid crystal panel, when the liquid crystal composition containing the polymerizable compound is filled between the first substrate and the second substrate, the crystal composition is filled in a state of Tni or higher. And a method of curing the polymerizable compound by irradiating the liquid crystal composition containing the polymerizable compound with UV.

  The composition in the present invention may further contain a compound represented by the general formula (Q).

(Wherein, R ^Q represents a straight-chain alkyl group or branched alkyl group having from 1 22 carbon atoms, one or two or more CH ₂ groups in the alkyl group, so that the oxygen atoms are not directly adjacent a, -O -, - CH = CH -, - CO -, - OCO -, - COO -, - C≡C -, - CF 2 O -, - OCF 2 - may be replaced by, ^{M Q} is trans -1,4-cyclohexylene group, 1,4-phenylene group or a single bond is represented.)
R ^Q represents a linear alkyl group having 1 to 22 carbon atoms or a branched alkyl group, and one or two or more CH ₂ groups in the alkyl group are —O—so that the oxygen atom is not directly adjacent to each other. -, - CH = CH -, - CO -, - OCO -, - COO -, - C≡C -, - CF 2 O -, - OCF 2 - may be substituted with, but 1 to 10 carbon atoms Linear alkyl group, linear alkoxy group, linear alkyl group in which one CH ₂ group is substituted by —OCO— or —COO—, branched alkyl group, branched alkoxy group, one CH ₂ group is —OCO— Or a branched alkyl group substituted with —COO—, a linear alkyl group having 1 to 20 carbon atoms, a linear alkyl group in which one CH ₂ group is substituted with —OCO— or —COO—, branched Chain alkyl group, branched alkoxy group, one CH ₂ group Is more preferably a branched alkyl group substituted with —OCO— or —COO—. ^MQ represents a trans-1,4-cyclohexylene group, a 1,4-phenylene group or a single bond, and a trans-1,4-cyclohexylene group or a 1,4-phenylene group is preferable.

  More specifically, the compound represented by the general formula (Q) is preferably a compound represented by the following general formula (Qa) to general formula (Qd).

Where R^Q1Is preferably a linear or branched alkyl group having 1 to 10 carbon atoms, R^Q2Is preferably a linear or branched alkyl group having 1 to 20 carbon atoms, and R ^Q3Is preferably a linear alkyl group having 1 to 8 carbon atoms, a branched alkyl group, a linear alkoxy group or a branched alkoxy group.^QIs preferably a linear alkylene group having 1 to 8 carbon atoms or a branched alkylene group. Of the compounds represented by general formula (Qa) to general formula (Qd), compounds represented by general formula (Qc) and general formula (Qd) are more preferable.

  In the composition of the present invention, the compound represented by the general formula (Q) preferably contains one or two kinds, more preferably contains 1 to 5 kinds, and the content thereof is from 0.001. The content is preferably 1% by mass, more preferably 0.001 to 0.1% by mass, and particularly preferably 0.001 to 0.05% by mass.

  More specifically, the following compounds (III-1) to (III-38) are preferred as the antioxidant or light stabilizer that can be used in the present invention.

(In the formula, n represents an integer of 0 to 20.)
The composition of the present invention preferably contains one or more compounds represented by general formula (Q) or compounds selected from general formulas (III-1) to (III-38). It is more preferable to contain 5 types, and the content is preferably 0.001 to 1% by mass, more preferably 0.001 to 0.1% by mass, and 0.001 to 0.05% by mass. Particularly preferred.

  In the composition containing the polymerizable compound of the present invention, the polymerizable compound contained therein is polymerized by ultraviolet irradiation to impart liquid crystal alignment ability, and the amount of transmitted light is controlled using the birefringence of the composition. Used for liquid crystal display elements.

  When the liquid crystal composition of the present invention contains a polymerizable compound, an appropriate polymerization rate is desirable for obtaining a good alignment performance of the liquid crystal as a method for polymerizing the polymerizable compound, such as ultraviolet rays or electron beams. A method in which the active energy rays are polymerized by irradiating them in a single or a combination or sequentially. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used. Further, when the polymerization is carried out in a state where the polymerizable compound-containing composition is sandwiched between two substrates, at least the substrate on the irradiated surface side must be given adequate transparency to the active energy rays. Don't be. Moreover, after polymerizing only a specific part using a mask during light irradiation, the orientation state of the unpolymerized part is changed by changing conditions such as an electric field, a magnetic field, or temperature, and further irradiation with active energy rays is performed. Then, it is possible to use a means for polymerization. In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying an alternating electric field to the polymerizable compound-containing composition. The alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In a horizontal electric field type MVA mode liquid crystal display element, the pretilt angle is preferably controlled from 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.

  The temperature during irradiation is preferably within a temperature range in which the liquid crystal state of the composition of the present invention is maintained. Polymerization is preferably performed at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 ° C. As a lamp for generating ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used. Moreover, as a wavelength of the ultraviolet-ray to irradiate, it is preferable to irradiate the ultraviolet-ray of the wavelength range which is not the absorption wavelength range of a composition, and it is preferable to cut and use an ultraviolet-ray as needed. The intensity of the irradiated ultraviolet light is preferably 0.1 mW / cm 2 to 100 W / cm 2, more preferably 2 mW / cm 2 to 50 W / cm 2. The amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm 2 to 500 J / cm 2, and more preferably 100 mJ / cm 2 to 200 J / cm 2. When irradiating with ultraviolet rays, the intensity may be changed. The time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiated ultraviolet rays, but is preferably from 10 seconds to 3600 seconds, and more preferably from 10 seconds to 600 seconds.

  As a method for polymerizing a polymerizable compound, an appropriate polymerization rate is desirable in order to obtain good alignment performance of liquid crystals. Therefore, active energy rays such as ultraviolet rays or electron beams are irradiated singly or in combination or sequentially. The method of polymerizing by is preferred. When ultraviolet rays are used, a polarized light source or a non-polarized light source may be used. Further, when the polymerization is carried out in a state where the polymerizable compound-containing composition is sandwiched between two substrates, at least the substrate on the irradiated surface side must be given adequate transparency to the active energy rays. Don't be. Moreover, after polymerizing only a specific part using a mask during light irradiation, the orientation state of the unpolymerized part is changed by changing conditions such as an electric field, a magnetic field, or temperature, and further irradiation with active energy rays is performed. Then, it is possible to use a means for polymerization. In particular, when ultraviolet exposure is performed, it is preferable to perform ultraviolet exposure while applying an alternating electric field to the polymerizable compound-containing composition. The alternating electric field to be applied is preferably an alternating current having a frequency of 10 Hz to 10 kHz, more preferably a frequency of 60 Hz to 10 kHz, and the voltage is selected depending on a desired pretilt angle of the liquid crystal display element. That is, the pretilt angle of the liquid crystal display element can be controlled by the applied voltage. In a horizontal electric field type MVA mode liquid crystal display element, the pretilt angle is preferably controlled from 80 degrees to 89.9 degrees from the viewpoint of alignment stability and contrast.

The temperature during irradiation is preferably within a temperature range in which the liquid crystal state of the composition of the present invention is maintained. Polymerization is preferably performed at a temperature close to room temperature, that is, typically at a temperature of 15 to 35 ° C. As a lamp for generating ultraviolet rays, a metal halide lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, or the like can be used. Moreover, as a wavelength of the ultraviolet-ray to irradiate, it is preferable to irradiate the ultraviolet-ray of the wavelength range which is not the absorption wavelength range of a composition, and it is preferable to cut and use an ultraviolet-ray as needed. Intensity of ultraviolet irradiation is ^preferably from ^{0.1mW / cm 2 ~100W / cm 2} , 2mW / cm 2 ~50W / cm 2 is more preferable. The amount of energy of ultraviolet rays to be irradiated can be adjusted as appropriate, but is preferably 10 mJ / cm ² to 500 J / cm ^{2, and} more preferably 100 mJ / cm ² to 200 J / cm 2. When irradiating with ultraviolet rays, the intensity may be changed. The time for irradiating with ultraviolet rays is appropriately selected depending on the intensity of the irradiating ultraviolet rays.

"Orientation layer"
In the preferred liquid crystal display element of the present invention, the liquid crystal molecules of the liquid crystal layer 5 are aligned on the surface in contact with the liquid crystal composition between the first substrate and the second substrate. It may be provided. In a liquid crystal display element that requires an alignment layer, it is disposed between the light conversion portion and the liquid crystal layer. Even if the alignment layer is thick, it is as thin as 100 nm or less and constitutes the light conversion portion. It does not completely block the interaction between the dyes such as nanocrystals and pigments and the liquid crystal compound constituting the liquid crystal layer.

  Further, in a liquid crystal display element that does not use an alignment layer, the interaction between light emitting nanocrystals constituting the light conversion part, pigments such as pigments, and the liquid crystal compound constituting the liquid crystal layer becomes greater.

  The alignment layer according to the present invention is preferably at least one selected from the group consisting of a rubbing alignment layer and a photo alignment layer. In the case of the rubbing alignment layer, there is no particular limitation, and a known polyimide alignment film can be suitably used.

  As the rubbing alignment film material, transparent organic materials such as polyimide, polyamide, BCB (Penzocyclobutene Polymer), and polyvinyl alcohol can be used. In particular, p-phenylenediamine, 4,4′-diaminodiphenyl Aliphatic or alicyclic tetracarboxylic acid anhydride such as diamine such as aliphatic or alicyclic diamine such as methane and butanetetracarboxylic anhydride, 2,3,5-tricarboxycyclopentylacetic acid anhydride, pyromellitic acid A polyimide alignment film obtained by imidizing a polyamic acid synthesized from an aromatic tetracarboxylic acid anhydride such as dianhydride is preferable. When used for a vertical alignment film or the like, it can be used without imparting alignment.

  In the case where the alignment layer according to the present invention is a photo-alignment layer, it may be one containing at least one photoresponsive molecule. The photoresponsive molecule is a photoresponsive dimerization-type molecule that forms a cross-linked structure by dimerization in response to light, and is a photoresponsive molecule that isomerizes in response to light and is oriented substantially perpendicular or parallel to the polarization axis. At least one selected from the group consisting of an isomerized molecule and a photoresponsive decomposable polymer in which a polymer chain is cleaved in response to light is preferred, and the photoresponsive isomerized molecule is sensitive and has an orientation regulating ability. This is particularly preferable.

  In the photoresponsive isomerization type polymer, the light used when isomerizing in response to light and orienting substantially perpendicular to the polarization axis is preferably 200 to 500 nm, and preferably 300 to 500 nm. It is more preferable that the thickness is 300 to 400 nm.

  The weight average molecular weight of the photoresponsive isomerization type polymer according to the present invention is preferably 10,000 to 800,000, more preferably 10,000 to 400,000, still more preferably 50,000 to 400,000, and 50,000 to 300,000. It is particularly preferred that

  The said weight average molecular weight (Mw) is obtained as a result of GPC (gel permeation chromatography, Gel Permeation Chromatography) measurement.

  Hereinafter, although an example is given and this invention is further explained in full detail, this invention is not limited by these. The following abbreviations are used for the description of compounds in the examples. Note that n represents a natural number.

(Side chain)
-N -C _n H _{2n + 1} linear alkyl group having n carbon atoms n-C _n H _{2n + 1-} linear alkyl group having n carbon atoms -On -OC _n H _{2n + 1} linear chain having n carbon atoms Jo alkoxyl group nO- C _n H _2n + 1 O- carbon atoms n linear alkoxyl group -V -CH = CH ₂
V- CH ₂ = CH-
-V1 -CH = CH-CH ₃
1V- CH ₃ -CH = CH-
_{-2V -CH 2 -CH 2 -CH = CH} 3
_{V2- CH 2 = CH-CH 2} -CH 2 -
_{-2V1 -CH 2 -CH 2 -CH = CH} -CH 3
_{1V2- CH 3 -CH = CH-CH} 2 -CH 2
(Linking group)
-N- -C _n H _2n-
-NO- -C _n H _2n -O-
-On- _{-O-C n H 2n} -
-COO- -C (= O) -O-
-OCO- -O-C (= O)-
-CF2O- -CF ₂ -O-
-OCF2- -O-CF ₂ -
(Ring structure)

  In the examples, the measured characteristics are as follows.

T _NI : Nematic phase-isotropic liquid phase transition temperature (° C.)
Δn: Refractive index anisotropy at 25 ° C. Δε: Dielectric anisotropy at 25 ° C. η: Viscosity at 25 ° C. (mPa · s)
γ ₁ : rotational viscosity at 25 ° C. (mPa · s)
"VHR measurement"
(Voltage holding ratio (%) at 333 K under conditions of frequency 60 Hz and applied voltage 1 V)
Light resistance test of a blue LED light source having a main emission peak at 450 nm:
The VHR was measured before and after irradiating the liquid crystal panel with a blue monochromatic LED light source having a peak at 450 nm at a wavelength of 450 nm for 68 hours.

LED light resistance test with main emission peak at 385 nm:
The VHR before and after irradiating the liquid crystal panel with a monochromatic LED having a peak at 385 nm at a wavelength of 385 nm for 60 seconds was measured.

"Production method of liquid crystal panel, backlight unit and liquid crystal display element"
(1) Production of liquid crystal panel (VA type liquid crystal panel)
On the transparent electrode having slits formed on the first substrate, an alignment film solution was formed by spin coating to form an alignment film having a dry thickness of 0.1 μm. An alignment film was similarly formed on the second substrate on which the color filter was formed. The first substrate on which the transparent electrode and the alignment film are formed and the second electrode substrate having the slits on which the color filters are formed are opposed to each other with the alignment films facing each other and irradiated with linearly polarized light or rubbed. The peripheral portions were bonded together with a sealant in a state of being arranged in a parallel direction (180 °) and maintaining a constant gap (4 μm) between the two substrates. Next, the following liquid crystal composition (liquid crystal compositions 1 to 9) is filled in the cell gap defined by the alignment film surface and the sealing agent by a vacuum injection method, and the pair of polarizing plates is placed on the first substrate and A VA liquid crystal panel was manufactured by pasting onto the second substrate. The liquid crystal panel thus produced was used as an evaluation element, and a light resistance test using blue light having a main light emission peak at 450 nm and a light resistance test using light having a main light emission peak at 385 nm were evaluated.

  The results are shown in Tables 1-9 below.

  In Tables 1 to 5, the decrease rate in the main emission peak at 450 nm is “the initial (= before 14 hours light resistance test) VHR value / after 14 hours light resistance test”, and the decrease in the main emission peak at 385 nm. The rate is “the VHR value at the initial stage (= before the 60 second light resistance test) / the VHR value after the 60 second light resistance test”. Therefore, the closer the reduction rate is to 1, the more stable it is to blue light having a main emission peak at 450 nm or light having a main emission peak at 385 nm. According to the above experimental results, the liquid crystal display element is excellent in light resistance, and it is considered that the deterioration of the liquid crystal layer due to the deterioration of the light-emitting nanocrystals or the partial irradiation spot of high-energy rays can be suppressed or prevented.

  It is confirmed that when the light having the main emission peak at 385 nm is irradiated, the liquid crystal display element having the composition example 2 has the lowest rate of decrease in the VHR value. On the other hand, when γ1 related to the high-speed response of the liquid crystal display element is observed, it is confirmed that the composition example 3 is the highest. The cause of the former is considered to be related to the fact that it contains two or more liquid crystal compounds including a condensed ring (naphthalene) and thus easily absorbs light. In addition, the latter is considered to be due to the increase in viscosity because the liquid crystal compound contains two or more rings including a chroman ring.

  Moreover, about the said composition example 8, 0.05 mass part of antioxidant of the following formula | equation (III-22) is added with respect to 100 mass parts of liquid crystal compositions of the composition example 8, and is the same as the said composition example 8. Alternatively, a VA-type liquid crystal panel may be manufactured and a light resistance test using blue light having a main emission peak at 450 nm and a light resistance test using light having a main emission peak at 385 nm may be evaluated.

  The light resistance test using light having a main emission peak at 450 nm and the light resistance test using light having a main light emission peak at 385 nm were performed in Composition Examples 12 to 10 in Tables 6 and 7 below except Composition Examples 1 to 9. Even when performed at 22, it is considered that an effect that is stable with respect to blue light having a main emission peak at 450 nm or light having a main emission peak at 385 nm is exhibited. As composition example 22, Example 30 of Japanese Patent No. 51222086 was used.

(PSVA liquid crystal panel)
The following polymerizable compounds

Polymeric compound-containing liquid crystal composition 1 in which 0.3 part by mass and 99.7 parts by mass of composition example 5 are mixed is applied with a polyimide alignment film that induces vertical alignment with a cell gap of 4 μm, and then has a fishbone structure. It injected by the vacuum injection method into the liquid crystal panel containing the board | substrate with ITO. As a material for forming a vertical alignment film, JALS2096 manufactured by JSR Corporation was used.

Thereafter, the liquid crystal panel into which the liquid crystal composition containing the polymerizable compound was injected was irradiated with ultraviolet rays through a filter that cuts out ultraviolet rays of 325 nm or less using a high-pressure mercury lamp with a voltage of 10 V applied at a frequency of 100 Hz. In this case, illuminance measured at the center wavelength of 365nm condition was adjusted to 100 mW / cm ^2, was irradiated with ultraviolet light at an accumulated light intensity of 10J / cm ^2. Then, using a fluorescent UV lamp, the illuminance was measured at a center wavelength of 313nm is adjusted to 3 mW / cm ^2, further irradiated with ultraviolet light at an accumulated light intensity 10J / cm ^2, the PSVA liquid crystal panel 1 Obtained. In the same manner as in the above composition example 5, the light resistance test using blue light having a main emission peak at 450 nm and the light resistance test using light having a main emission peak at 385 nm were evaluated. As a result, no display defect was observed in both cases of blue light having a main emission peak at 450 nm and light having a main emission peak at 385 nm.

  The following polymerizable compound (XX-5);

A polymerizable compound-containing liquid crystal composition 2 obtained by mixing 99.7 parts by mass of Composition Example 1 is coated with a polyimide alignment film that induces vertical alignment at a cell gap of 4 μm, and then includes a fishbone structure ITO-attached substrate. The liquid crystal panel was injected by a vacuum injection method. As a material for forming a vertical alignment film, JALS2096 manufactured by JSR Corporation was used.

Thereafter, the liquid crystal panel into which the liquid crystal composition containing the polymerizable compound was injected was irradiated with ultraviolet rays through a filter that cuts out ultraviolet rays of 325 nm or less using a high-pressure mercury lamp with a voltage of 10 V applied at a frequency of 100 Hz. In this case, illuminance measured at the center wavelength of 365nm condition was adjusted to 100 mW / cm ^2, was irradiated with ultraviolet light at an accumulated light intensity of 10J / cm ^2. Then, using a fluorescent UV lamp, the illuminance was measured at a center wavelength of 313nm is adjusted to 3 mW / cm ^2, further irradiated with ultraviolet light at an accumulated light intensity 10J / cm ^2, the PSVA liquid crystal panel 2 In the same manner as in Composition Example 1, the light resistance test using a blue LED having a main light emission peak at 450 nm and the light resistance test using an LED having a main light emission peak at 385 nm were evaluated. As a result, no display defect was observed in any of a blue LED having a main emission peak at 450 nm and an LED having a main emission peak at 385 nm.

(Spontaneous alignment type VA liquid crystal panel)
2 parts by mass of the following spontaneous alignment agent (the following formula (SA-1)), 0.5 part by mass of the polymerizable compound (XX-2), 99.7 parts by mass of the composition example 7 above,

The liquid crystal composition 3 mixed with the above was injected by a vacuum injection method into a liquid crystal panel including a substrate with ITO having a cell gap of 4 μm and no alignment film.

Thereafter, the liquid crystal panel into which the liquid crystal composition containing the polymerizable compound was injected was irradiated with ultraviolet rays through a filter that cuts out ultraviolet rays of 325 nm or less using a high-pressure mercury lamp with a voltage of 10 V applied at a frequency of 100 Hz. In this case, illuminance measured at the center wavelength of 365nm condition was adjusted to 100 mW / cm ^2, was irradiated with ultraviolet light at an accumulated light intensity of 10J / cm ^2. Then, using a fluorescent UV lamp, central wavelength illuminance measured under the conditions of 313nm is adjusted to 3 mW / cm ^2, further irradiated with ultraviolet light at an accumulated light intensity 10J / cm ^2, spontaneous alignment type VA liquid crystal panel 3 was evaluated in the same manner as in Composition Example 7 above, in the light resistance test using blue light having a main emission peak at 450 nm and the light resistance test using light having a main emission peak at 385 nm. As a result, in both cases of blue light having a main emission peak at 450 nm and light having a main emission peak at 385 nm, the initial VHR value and the VHR value after the light resistance test were substantially the same as those in the above composition example 7. became.

  2 parts by mass of the following spontaneous alignment agent (the following formula (SA-2)), 0.5 part by mass of the polymerizable compound (XX-5), 99.7 parts by mass of the composition example 4

The liquid crystal composition mixed with was injected by a vacuum injection method into a liquid crystal panel including a substrate with ITO having a cell gap of 3.5 μm and no alignment film.

Thereafter, the liquid crystal panel into which the liquid crystal composition containing the polymerizable compound was injected was irradiated with ultraviolet rays through a filter that cuts out ultraviolet rays of 325 nm or less using a high-pressure mercury lamp with a voltage of 10 V applied at a frequency of 100 Hz. In this case, illuminance measured at the center wavelength of 365nm condition was adjusted to 100 mW / cm ^2, was irradiated with ultraviolet light at an accumulated light intensity of 10J / cm ^2. Then, using a fluorescent UV lamp, central wavelength illuminance measured under the conditions of 313nm is adjusted to 3 mW / cm ^2, further irradiated with ultraviolet light at an accumulated light intensity 10J / cm ^2, spontaneous alignment type VA liquid crystal panel As in Composition Example 4, the light resistance test using blue light having a main emission peak at 450 nm and the light resistance test using light having a main emission peak at 385 nm were evaluated. As a result, in both cases of blue light having a main emission peak at 450 nm and light having a main emission peak at 385 nm, the initial VHR value and the VHR value after the light resistance test were almost the same as those in Composition Example 4 above. became.

(IPS liquid crystal panel)
An alignment film solution was formed on the pair of comb electrodes formed on the first substrate by a spin coating method to form an alignment film. An alignment film was similarly formed on the color filter and the second substrate on which the planarizing film was formed on the color filter. The first substrate on which the comb-shaped transparent electrode and the alignment film are formed and the second substrate on which the planarization film is formed on the color filter and the color filter are opposed to each other and irradiated with linearly polarized light, or Arranged so that the direction of rubbing in the horizontal direction was an anti-parallel direction (180 °), and the peripheral part was bonded with a sealant in a state where a constant gap (4 μm) was maintained between the two substrates. Next, the following liquid crystal composition (liquid crystal compositions 1 to 8) is filled into the cell gap defined by the alignment film surface and the sealing agent by a vacuum injection method, and then the pair of polarizing plates is placed on the first substrate and An IPS type liquid crystal panel was manufactured by bonding onto the second substrate.

(FFS type liquid crystal panel)
After forming the flat common electrode on the first transparent substrate, the insulating layer film is formed, and further, the transparent comb electrode is formed on the insulating layer film, and then the alignment film solution is formed on the transparent comb electrode. An electrode substrate was formed by spin coating. An alignment film was similarly formed on the color filter and the second substrate on which the planarizing film was formed on the color filter. Next, the first substrate on which the comb-shaped transparent electrode and the alignment film are formed and the second substrate on which the planarizing film is formed on the color filter and the color filter are opposed to each other and irradiated with linearly polarized light. Or, the rubbing direction was arranged in the anti-parallel direction (180 °), and the peripheral part was bonded with a sealant in a state where a constant gap (4 μm) was maintained between the two substrates. Next, in the cell gap defined by the alignment film surface and the sealing agent, the following liquid crystal composition (liquid crystal compositions 9 to 21) is filled by a dropping method at a temperature just exceeding the clearing point, and then at room temperature. The FFS type liquid crystal panel was produced by cooling to the temperature.

(2) Production of backlight unit (Production of nanocrystal film for light emission)
Light emitting nanocrystals (InP / ZnS core-shell nanocrystals (red light-emitting), InP / ZnS core-shell nanocrystals (green light-emitting), both oleic acid ligands) solid content of 3 parts by mass when the nonvolatile component is 100% by mass The toluene dispersion of each of the green and red light emitting nanocrystals, the photocurable acrylic resin and the photoinitiator were mixed so that the photocurable acrylic resin was 93 parts by mass and the photoinitiator was 4 parts by mass, and the evaporator The resin composition for nanocrystal-containing light emission is prepared by removing toluene from the above. After coating this resin composition so that it might become a film thickness of 100um on a PET film, the PET film was laminated | stacked further. A light conversion part (nanocrystal film for light emission) was obtained by performing UV irradiation until the integrated UV irradiation amount was 5000 mJ.

(Preparation of backlight unit 1)
A blue LED light source is installed at the end of one side of the light guide plate, the portion excluding the irradiation surface is covered with a reflection sheet, the above-mentioned nanocrystal film sheet for light emission is disposed on the irradiation surface of the light guide plate, and a diffusion sheet is further provided on the irradiation side. The backlight unit 1 was produced by disposing.

(Preparation of backlight unit 2)
A blue LED is arranged in a lattice pattern on a lower reflecting plate that scatters and reflects light, a diffusion plate is arranged immediately above the irradiation side, and the above-mentioned nanocrystal film sheet for light emission is arranged on the diffusion plate. A diffusion sheet was disposed on the irradiation side to produce a backlight unit 2.

(Production of light-emitting element including nanocrystal for light emission)
Light emitting nanocrystals (InP / ZnS core-shell nanocrystals (red light-emitting), InP / ZnS core-shell nanocrystals (green light-emitting), both oleic acid ligands) when solid content is 100% by mass, solid content is 8 parts by mass In order to make 92 parts by mass of the epoxy resin curing agent and the curing catalyst mixture, each of the green and red light emitting nanocrystals is mixed with a toluene dispersion and an epoxy resin, and the toluene is removed by an evaporator. Adjust the composition. This was mixed with a curing agent and a curing catalyst, and then the composition was applied on the LED element so as to have a thickness of about 1 mm. The LED element provided with the light conversion part was obtained by hardening resin under the conditions of 110 degreeC x 3 hours.

(Preparation of backlight unit 3)
A blue light emitting diode element including the above-described nanocrystals for light emission is installed at one end of the light guide plate, a portion other than the irradiation surface is covered with a reflection sheet, and a diffusion sheet is disposed on the irradiation surface of the light guide plate to provide a backlight unit. 3 was produced.

(Preparation of backlight unit 4)
A blue LED element including the above-described nanocrystals for light emission is arranged in a lattice shape on a lower reflection plate that scatters and reflects light, and further, a diffusion sheet and a diffusion sheet are arranged on the diffusion plate immediately above the irradiation side. 4 was produced.

(Production of transparent tube containing nanocrystals for light emission)
Light emitting nanocrystals (InP / ZnS core-shell nanocrystals (red light-emitting), InP / ZnS core-shell nanocrystals (green light-emitting), both oleic acid ligands) with a non-volatile component of 100% by mass, 1 mass part of solid content , Including luminescence nanocrystals by mixing toluene dispersion of each green and red luminescent nanocrystals and epoxy resin so that the epoxy resin, curing agent and curing catalyst mixture is 99 parts by mass, and then removing toluene with an evaporator. A resin composition was prepared. Then, the glass tube with one end sealed is filled with the resin composition, the epoxy resin is cured under conditions of 110 ° C. × 3 hours, and finally the unsealed end is sealed. A transparent crystal body containing nanocrystals for light emission was obtained.

(Preparation of backlight unit 5)
A blue LED light source is installed at the end of one side of the light guide plate, and the nanocrystal-containing transparent tube is disposed between the blue LED light source and the light guide plate. Furthermore, the part except an irradiation surface was covered with the reflection sheet, the diffusion sheet was arrange | positioned on the irradiation surface of the light-guide plate, and the backlight unit 5 was produced.

(3) Production of liquid crystal display element and measurement of color reproduction region The color reproduction region is obtained by attaching the backlight units 1 to 5 produced above to the obtained VA liquid crystal panel and spontaneous alignment type VA liquid crystal panel, respectively. Was measured. As a result, in both the liquid crystal display element having the light conversion part and the conventional liquid crystal display element not having the light conversion part, the former was confirmed to have an expanded color reproduction region.

  Similarly, the backlight units 1 to 5 prepared above were attached to the IPS type liquid crystal panel obtained above, and the color reproduction region was measured. As a result, in both the liquid crystal display element having the light conversion part and the conventional liquid crystal display element not having the light conversion part, the former was confirmed to have an expanded color reproduction region.

  The backlight units 1 to 5 produced above were attached to the obtained FFS type liquid crystal panel, and the color reproduction region was measured. As a result, in both the liquid crystal display element having the light conversion part and the conventional liquid crystal display element not having the light conversion part, the former was confirmed to have an expanded color reproduction region.

1000: liquid crystal display element 100: backlight unit (101: light source unit, 102: light guide unit, 103: light conversion unit) 101: light source unit (L: light emitting element (105: light emitting diode, 110: light source substrate), 112a B: fixing member)
102: Light guide section (106: diffusion plate, 104: light guide plate)
103: light conversion unit 110: light source substrate 111: transparent filling container 112a, b: fixing member 113: recessed container SUB1: (transparent) electrode substrate SUB2: (transparent) substrate (including a case where electrodes are provided)
SUB3: (Transparent) substrate NC: Nanocrystal for light emission (compound semiconductor)
DESCRIPTION OF SYMBOLS 1, 8: Polarizing layer 2, 7: Transparent substrate 3: 1st electrode layer 3 ': 2nd electrode layer 4: Alignment film 5: Liquid crystal layer 6: Color filter (The case where the pigment | dye is contained in resin is also included. )
11: gate electrode 12: gate insulating film 13: semiconductor layer 14: protective layer 16: drain electrode 17: source electrode 18: passivation film 21: pixel electrode 22: common electrode 33: flat film 35: insulating film

Claims (13)

A pair of substrates provided so that the first substrate and the second substrate are opposed to each other;
A liquid crystal layer sandwiched between the first substrate and the second substrate;
A pixel electrode provided on at least one of the first substrate and the second substrate;
A common electrode provided on at least one of the first substrate and the second substrate;
A color filter composed of a black matrix and three primary color pixel portions of red (R), green (G), and blue (B);
A light emitting element that emits ultraviolet or visible light; and
A light conversion unit containing nanocrystals for light emission that converts incident light from the light emitting element into light of at least one of red (R), green (G), and blue (B), and emits light; and
The liquid crystal layer has the general formula (i):

(In the formula, R ⁱ¹ and R ⁱ² are each independently an alkyl group having 1 to 8 carbon atoms, an alkenyl group having 2 to 8 carbon atoms, an alkoxy group having 1 to 8 carbon atoms, or 2 to 2 carbon atoms. 8 represents an alkenyloxy group, A ⁱ¹ represents a 1,4-phenylene group or a trans-1,4-cyclohexylene group, and n ⁱ¹ represents 0 or 1). A liquid crystal display element comprising a liquid crystal composition containing at least%.   The liquid crystal display element according to claim 1, wherein the light conversion unit has an emission spectrum in a red (R) and green (G) region, and the light emitting element has an emission spectrum in a blue region.   The liquid crystal display element according to claim 1, wherein the light conversion unit has an emission spectrum in a red (R), green (G), and blue (B) region, and the light emitting element has an emission spectrum in an ultraviolet region.   4. The liquid crystal display element according to claim 2, wherein the half-value width of at least one emission spectrum in the red (R), green (G), and blue (B) region is 20 to 60 nm.   5. The liquid crystal according to claim 1, wherein the light conversion unit is provided between the light source unit side substrate and the light emitting element on either the first substrate or the second substrate. Display element.   The said light conversion part is a sheet form, and it has arrange | positioned in the whole surface with respect to the board | substrate by the side of the said light emitting element by either said 1st board | substrate or a 2nd board | substrate. Liquid crystal display element. The liquid crystal display element according to claim 1, wherein the light conversion unit is disposed on a side surface of the first substrate or the second substrate.   The liquid crystal display element of any one of Claims 1-5 which has a light source part provided with the light conversion part containing the said light emitting element and the said nanocrystal for light emission. The light-emitting nanocrystal includes a core including at least one first semiconductor material;
The liquid crystal display element according to claim 1, further comprising: a shell that covers the core and includes a second semiconductor material that is the same as or different from the core.   The first semiconductor material is one selected from the group consisting of II-VI semiconductors, III-V semiconductors, I-III-VI semiconductors, IV semiconductors, and I-II-IV-VI semiconductors Or the liquid crystal display element of Claim 9 which is 2 or more types. The liquid crystal composition has the general formula (N-1)

(Wherein R^N11And R^N12Each independently represents an alkyl group having 1 to 8 carbon atoms, and one or non-adjacent two or more —CH in the alkyl group.₂-May be each independently substituted by -CH = CH-, -C≡C-, -O-, -CO-, -COO- or -OCO-,
  A^N11And A^N12Each independently
(A) 1,4-cyclohexylene group (one —CH present in this group)₂-Or two or more non-adjacent -CH₂-May be replaced by -O-. )as well as
(B) 1,4-phenylene group (one -CH = present in this group or two or more non-adjacent -CH = may be replaced by -N =).
(C) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or One —CH═ present in the 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or two or more non-adjacent —CH═ may be replaced by —N═. )
(D) 1,4-cyclohexenylene group
The group (a), the group (b), the group (c) and the group (d) are each independently substituted with a cyano group, a fluorine atom or a chlorine atom. well,
  Z^N11And Z^N12Each independently represents a single bond, —CH₂CH₂-,-(CH₂) ₄-, -OCH₂-, -CH₂O-, -COO-, -OCO-, -OCF₂-, -CF₂O—, —CH═N—N═CH—, —CH═CH—, —CF═CF— or —C≡C—,
  n^N11And n^N12Each independently represents an integer from 0 to 3,^N11+ N^{N1 2}Are each independently 1, 2 or 3, and A^N11~ A^N12, Z^N11~ Z^N12When a plurality of are present, they may be the same or different. The liquid crystal display element according to any one of claims 1 to 10, comprising a liquid crystal composition containing 20 to 80% by weight of a compound represented by formula (I) and having a dielectric anisotropy (Δε) of −1 or less. The liquid crystal composition has the general formula (J)

(Wherein R ^J1 represents an alkyl group having 1 to 8 carbon atoms, and one or two or more non-adjacent —CH ₂ — in the alkyl group are each independently —CH═CH—, — Optionally substituted by C≡C—, —O—, —CO—, —COO— or —OCO—,
n ^J1 represents 0, 1, 2, 3 or 4;
A ^J1 , A ^J2 and A ^J3 are each independently
(A) 1,4-cyclohexylene group (one —CH ₂ — present in this group or two or more non-adjacent —CH ₂ — may be replaced by —O—).
(B) a 1,4-phenylene group (one —CH═ present in the group or two or more non-adjacent —CH═ may be replaced by —N═) and (c) Naphthalene-2,6-diyl group, 1,2,3,4-tetrahydronaphthalene-2,6-diyl group or decahydronaphthalene-2,6-diyl group (naphthalene-2,6-diyl group or 1,2 , 3,4-tetrahydronaphthalene-2,6-diyl group, one —CH═ or two or more non-adjacent —CH═ may be replaced by —N═.
The group (a), the group (b) and the group (c) are each independently selected from the group consisting of cyano group, fluorine atom, chlorine atom, methyl group, trifluoromethyl group or trifluoro May be substituted with a methoxy group,
Z ^J1 and Z ^J2 are each independently a single bond, —CH ₂ CH ₂ —, — (CH ₂ ) ₄ —, —OCH ₂ —, —CH ₂ O—, —OCF ₂ —, —CF ₂ O—, -COO-, -OCO- or -C≡C-
When n ^J1 is 2, 3 or 4 and a plurality of A ^J2 are present, they may be the same or different, and n ^J1 is 2, 3 or 4 and a plurality of Z ^J1 is present. If they are the same or different,
X ^J1 represents a hydrogen atom, a fluorine atom, a chlorine atom, a cyano group, a trifluoromethyl group, a fluoromethoxy group, a difluoromethoxy group, a trifluoromethoxy group, or a 2,2,2-trifluoroethyl group. The liquid crystal display element according to any one of claims 1 to 10, comprising a liquid crystal composition containing 5 to 60% by weight of a compound represented by (1) and having a dielectric anisotropy (Δε) of 1 or more.   The liquid crystal display element according to claim 1, wherein Δn of the liquid crystal composition in the liquid crystal layer is 0.05 to 0.15.

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