WO2014042092A1

WO2014042092A1 - Liquid crystal panel and display device

Info

Publication number: WO2014042092A1
Application number: PCT/JP2013/074084
Authority: WO
Inventors: 伊藤昌稔
Original assignee: シャープ株式会社
Priority date: 2012-09-13
Filing date: 2013-09-06
Publication date: 2014-03-20

Abstract

A liquid crystal panel (2) having as a pair of substrates a color filter substrate (4) and an active matrix substrate (5), and a liquid crystal layer (LC) provided between the color filter substrate (4) and the active matrix substrate (5), wherein a seal material (F) is provided for sealing the liquid crystal layer (LC), the seal material (F) being provided in a frame shape on the external periphery of the color filter substrate (4) and the active matrix substrate (5), and the seal material (F) is colored so that the optical density thereof has a value of at least 3.

Description

Liquid crystal panel and display device

The present invention relates to a liquid crystal panel and a display device using the same.

In recent years, for example, liquid crystal display devices have been widely used in liquid crystal televisions, monitors, mobile phones and the like as flat panel displays having features such as thinness and light weight compared to conventional cathode ray tubes. Such a liquid crystal display device includes an illumination device (backlight device) that emits light, and a liquid crystal panel that displays a desired image by serving as a shutter for light from a light source provided in the illumination device. It is included.

The liquid crystal panel as described above includes a liquid crystal layer containing liquid crystal molecules and a pair of substrates sandwiching the liquid crystal layer. In the liquid crystal panel, a plurality of pixels are provided in the effective display area. In the plurality of pixels, generally, a color filter layer of one of red (R), green (G), and blue (B) formed on one side of a pair of substrates has a corresponding color. It is designed to display. In the liquid crystal panel, a black matrix (light-shielding film) is formed on one side of a pair of substrates so as to be disposed between two adjacent color filter layers. The display contrast is improved. Further, in the liquid crystal panel, a black matrix is formed in a frame shape so as to be along the outer peripheral portion of one substrate outside the effective display area, and light is transmitted from the outside of the effective display area to the outside by this frame-shaped black matrix. It is designed to prevent leakage.

Further, in the liquid crystal panel, a sealing material is provided on the outer peripheral portion of these substrates (that is, the outer peripheral portion of the liquid crystal panel) in order to seal the liquid crystal layer between the pair of substrates.

In addition, as described in Patent Document 1 below, for example, a conventional liquid crystal panel uses a black seal material, and is provided with a cutting portion spacer at a portion of a scribe line that separates each liquid crystal panel from a mother substrate. The thickness of the black seal material in the scribe line, that is, the thickness of the outer peripheral portion of the black seal member is made smaller than the thickness of the inner peripheral portion. In this conventional liquid crystal panel, it is possible to stably separate individual liquid crystal panels from the mother substrate by the cutting portion spacer while preventing light leakage from the outer peripheral portion of the liquid crystal panel by the black seal material. It was supposed to be.

JP 2012-32506 A

However, in the conventional liquid crystal panel as described above, it may not be possible to reliably prevent light leakage due to the black sealing material. In particular, when narrowing the frame of the liquid crystal panel, light may leak out from the black seal material.

Specifically, in the above-mentioned conventional liquid crystal panel, the black sealing material is constituted by adding carbon, Ti black, etc. to the epoxy resin, but the black sealing material has insufficient light shielding properties. There was a case. In particular, when narrowing the frame, in this conventional liquid crystal panel, the width dimension of the black sealing material is also reduced, the light shielding property of the black sealing material is greatly reduced, and light leaks to the outside. Could not prevent. In particular, in this conventional liquid crystal panel, the thickness of the black seal material is small on the side where the cut spacers are provided, and thus light leakage is likely to occur. As a result, this conventional liquid crystal panel has a problem that display quality is deteriorated.

In view of the above-described problems, the present invention provides a liquid crystal panel excellent in display quality capable of reliably preventing the occurrence of light leakage even when a narrow frame is achieved, and a display device using the same. Objective.

In order to achieve the above object, a liquid crystal panel according to the present invention is a liquid crystal panel having a pair of substrates and a liquid crystal layer provided between the pair of substrates,
The outer peripheral portion of the pair of substrates is provided in a frame shape, and includes a sealing material for sealing the liquid crystal layer,
The sealing material is colored so that the optical density value is 3 or more.

In the liquid crystal panel configured as described above, a frame-shaped sealing material is provided on the outer periphery of the pair of substrates. In addition, this sealing material is colored so that the optical density value is 3 or more. Thus, unlike the conventional example, even when the frame is narrowed, the occurrence of light leakage can be surely prevented, and a liquid crystal panel excellent in display quality can be configured.

Further, in the liquid crystal panel, it is preferable that the sealing material is configured such that the outer peripheral portion has a greater thickness than the inner peripheral portion.

In this case, the occurrence of light leakage can be more reliably prevented even when the frame is narrowed.

The liquid crystal panel may further include first and second insulating films provided on the surfaces of the pair of substrates,
It is preferable that an outer peripheral portion of the sealing material is provided on the first and second insulating films.

In this case, the adhesive strength of the sealing material can be improved with respect to each pair of substrates.

In the liquid crystal panel, it is preferable that an outer peripheral portion of the sealing material is provided on the surface of each of the pair of substrates.

In this case, the adhesive strength of the sealing material can be further improved with respect to the pair of substrates.

In the liquid crystal panel, a black matrix film is provided on the surface of one of the pair of substrates,
It is preferable that an overlap dimension in which the inner peripheral portion of the sealing material and the black matrix film overlap each other is set to be less than 0.1 mm.

In this case, the boundary accuracy between the effective display area and the frame area of the liquid crystal panel can be improved, and a sealing material can be firmly provided for the pair of substrates.

Further, in the liquid crystal panel, it is preferable that the sealing material is provided so that an outer peripheral portion thereof coincides with each end portion of the pair of substrates.

In this case, it is possible to easily narrow the frame of the liquid crystal panel.

In the liquid crystal panel, it is preferable that a sealing material having a thermal radical polymerization initiator and a radical polymerizable resin is used as the sealing material.

In this case, a sealing material can be easily and firmly provided for each pair of substrates.

Further, the display device of the present invention is characterized by using any of the above liquid crystal panels.

In the display device configured as described above, a liquid crystal panel with excellent display quality that can reliably prevent the occurrence of light leakage even when narrowing the frame is used. It is possible to easily configure a high-performance display device having the same.

According to the present invention, it is possible to provide a liquid crystal panel excellent in display quality that can reliably prevent the occurrence of light leakage even when narrowing the frame, and a display device using the same.

FIG. 1 is a diagram for explaining a liquid crystal display device according to a first embodiment of the present invention. FIG. 2 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG. FIG. 3 is a plan view for explaining a sealing material provided in the liquid crystal panel. FIG. 4 is a cross-sectional view for explaining the main configuration of the liquid crystal panel. FIG. 5 is a cross-sectional view for explaining a main configuration of a liquid crystal panel according to the second embodiment of the present invention. FIG. 6 is a cross-sectional view for explaining the main configuration of a liquid crystal panel according to the third embodiment of the present invention. FIG. 7 is a plan view for explaining a sealing material provided in a liquid crystal panel according to the fourth embodiment of the present invention. FIG. 8 is a cross-sectional view for explaining a main configuration of the liquid crystal panel shown in FIG. FIG. 9 is a cross-sectional view for explaining the main configuration of a liquid crystal panel according to the fifth embodiment of the present invention.

Hereinafter, preferred embodiments showing a liquid crystal panel and a display device of the present invention will be described with reference to the drawings. In the following description, the case where the present invention is applied to a transmissive liquid crystal display device will be described as an example. Moreover, the dimension of the structural member in each figure does not faithfully represent the actual dimension of the structural member, the dimensional ratio of each structural member, or the like.

[First Embodiment]
FIG. 1 is a diagram for explaining a liquid crystal display device according to a first embodiment of the present invention. 1, the liquid crystal display device 1 according to the present embodiment includes a liquid crystal panel 2 in which the upper side of FIG. 1 is installed as a viewing side (display surface side), and a non-display surface side of the liquid crystal panel 2 (lower side of FIG. 1). And a backlight device 3 that generates illumination light for illuminating the liquid crystal panel 2.

The liquid crystal panel 2 includes a color filter substrate 4 and an active matrix substrate 5 that constitute a pair of one and other substrates, respectively, and

polarizing plates

6 and 7 provided on the outer surfaces of the color filter substrate 4 and the active matrix substrate 5, respectively. And. A liquid crystal layer LC is sandwiched between the color filter substrate 4 and the active matrix substrate 5. In the liquid crystal panel 2, as will be described in detail later, the liquid crystal layer LC is sealed with a sealing material.

Further, the color filter substrate 4 and the active matrix substrate 5 are made of a flat transparent glass material or a transparent synthetic resin such as an acrylic resin. Resin films such as TAC (triacetyl cellulose) or PVA (polyvinyl alcohol) are used for the

polarizing plates

6 and 7 and correspond to cover at least the effective display area of the display surface provided in the liquid crystal panel 2. It is bonded to the color filter substrate 4 or the active matrix substrate 5.

In the active matrix substrate 5, pixel electrodes, thin film transistors (TFTs), and the like are formed between the liquid crystal layer LC in accordance with a plurality of pixels included in the display surface of the liquid crystal panel 2 ( Details will be described later.) On the other hand, on the color filter substrate 4, a color filter layer (not shown), an overcoat film described later, a common electrode, and the like are formed between the liquid crystal layer LC.

Further, the liquid crystal panel 2 is provided with an FPC (Flexible Printed Circuit) 8 connected to a control device (not shown) for controlling the drive of the liquid crystal panel 2, and operates the liquid crystal layer LC in units of pixels. Thus, the display surface is driven in units of pixels, and a desired image is displayed on the display surface.

The liquid crystal mode and pixel structure of the liquid crystal panel 2 are arbitrary. Moreover, the drive mode of the liquid crystal panel 2 is also arbitrary. That is, as the liquid crystal panel 2, any liquid crystal panel that can display information can be used. Therefore, the detailed structure of the liquid crystal panel 2 is not shown in FIG.

The backlight device 3 includes a light emitting diode 9 as a light source, and a light guide plate 10 disposed to face the light emitting diode 9. Further, in the backlight device 3, the light emitting diode 9 and the light guide plate 10 are sandwiched by the bezel 14 having an L-shaped cross section in a state where the liquid crystal panel 2 is installed above the light guide plate 10. A case 11 is placed on the color filter substrate 4. Thus, the backlight device 3 is assembled to the liquid crystal panel 2 and is integrated as a transmissive liquid crystal display device 1 in which illumination light from the backlight device 3 is incident on the liquid crystal panel 2.

For the light guide plate 10, for example, a synthetic resin such as a transparent acrylic resin is used, and light from the light emitting diode 9 enters. On the opposite side (opposite surface side) of the light guide plate 10 to the liquid crystal panel 2, a reflection sheet 12 is installed. Further, an optical sheet 13 such as a lens sheet or a diffusion sheet is provided on the liquid crystal panel 2 side (light emitting surface side) of the light guide plate 10, and the inside of the light guide plate 10 has a predetermined light guide direction (left side in FIG. 1). The light from the light emitting diode 9 guided in the direction from the right side to the right side is changed to the planar illumination light having uniform luminance and applied to the liquid crystal panel 2.

In the above description, the configuration using the edge light type backlight device 3 having the light guide plate 10 has been described. However, the present embodiment is not limited to this, and a direct type backlight device is used. May be. A backlight device having other light sources such as a cold cathode fluorescent tube and a hot cathode fluorescent tube other than the light emitting diode can also be used.

Next, the liquid crystal panel 2 of the present embodiment will be specifically described with reference to FIG.

FIG. 2 is a diagram for explaining the configuration of the liquid crystal panel shown in FIG.

2, the liquid crystal display device 1 (FIG. 1) includes a panel control unit 15 that controls driving of the liquid crystal panel 2 (FIG. 1) as the display unit that displays information such as characters and images, and the panel control. A source driver 16 and a gate driver 17 that operate based on an instruction signal from the unit 15 are provided.

The panel control unit 15 is provided in the control device, and receives a video signal from the outside of the liquid crystal display device 1. Further, the panel control unit 15 performs predetermined image processing on the input video signal to generate each instruction signal to the source driver 16 and the gate driver 17, and the input video signal. A frame buffer 15b capable of storing display data for one frame included. Then, the panel control unit 15 performs drive control of the source driver 16 and the gate driver 17 according to the input video signal, so that information according to the video signal is displayed on the liquid crystal panel 2.

The source driver 16 and the gate driver 17 are installed on the active matrix substrate 5. Specifically, the source driver 16 is installed on the surface of the active matrix substrate 5 along the lateral direction of the liquid crystal panel 2 in the outer region of the effective display area A of the liquid crystal panel 2 as a display panel. . Further, the gate driver 17 is installed on the surface of the active matrix substrate 5 so as to be along the vertical direction of the liquid crystal panel 2 in the outer region of the effective display region A.

The source driver 16 and the gate driver 17 are drive circuits that drive a plurality of pixels P provided on the liquid crystal panel 2 side by pixel. The source driver 16 and the gate driver 17 include a plurality of source lines S1 to S1. SM (M is an integer of 2 or more, hereinafter collectively referred to as “S”) and a plurality of gate wirings G1 to GN (N is an integer of 2 or more and is hereinafter collectively referred to as “G”). Each is connected. These source wiring S and gate wiring G constitute a data wiring and a scanning wiring, respectively, on a transparent glass material or a transparent synthetic resin substrate (not shown) included in the active matrix substrate 5. Are arranged in a matrix so as to cross each other. That is, the source wiring S is provided on the substrate so as to be parallel to the matrix-like column direction (vertical direction of the liquid crystal panel 2), and the gate wiring G is arranged in the matrix-like row direction (horizontal of the liquid crystal panel 2). Is provided on the substrate so as to be parallel to (direction).

Further, in the vicinity of the intersection between the source line S and the gate line G, the thin film transistor 18 as a switching element and the pixel P having the pixel electrode 19 connected to the thin film transistor 18 are provided. In each pixel P, the common electrode 20 is configured to face the pixel electrode 19 with the liquid crystal layer LC provided on the liquid crystal panel 2 interposed therebetween. That is, in the active matrix substrate 5, the thin film transistor 18, the pixel electrode 19, and the common electrode 20 are provided for each pixel.

In the active matrix substrate 5, regions of a plurality of pixels P are formed in each region partitioned in a matrix by the source wiring S and the gate wiring G. The plurality of pixels P include red (R), green (G), and blue (B) pixels. These RGB pixels are sequentially arranged in this order, for example, in parallel with the gate wirings G1 to GN. Further, these RGB pixels can display corresponding colors by a color filter layer (not shown) provided on the color filter substrate 4 side.

In the active matrix substrate 5, the gate driver 17 scans the gate wirings G1 to GN with respect to the gate wirings G1 to GN based on the instruction signal from the image processing unit 15a (gate signal). Signal) in sequence. Further, the source driver 16 supplies a data signal (voltage signal (gradation voltage)) corresponding to the luminance (gradation) of the display image to the corresponding source wirings S1 to SM based on the instruction signal from the image processing unit 15a. Output.

Hereinafter, the configuration of the main part of the liquid crystal panel 2 of the present embodiment will be specifically described with reference to FIGS.

FIG. 3 is a plan view for explaining the sealing material provided on the liquid crystal panel. FIG. 4 is a cross-sectional view for explaining the main configuration of the liquid crystal panel.

As shown in FIG. 3, in the liquid crystal panel 2 of the present embodiment, a frame-like sealing material F (shown by hatching) is provided on the outer periphery of the liquid crystal panel 2, and is surrounded by the sealing material F. The liquid crystal layer LC is sealed in the region. In the liquid crystal layer LC, the liquid crystal molecules do not need an injection port, and are filled in a region surrounded by the sealing material F by, for example, an ODF (dropping) method. An effective display area A of the liquid crystal panel 2 is set on the inner side of the area surrounded by the sealing material F.

Further, as shown in FIG. 4, in the liquid crystal panel 2 of the present embodiment, an overlayer as a first insulating film is formed on the inner surface of the color filter substrate 4 (that is, the surface facing the active matrix substrate 5). A coat film 21a is formed. A common electrode 20 and a first alignment film 22a are formed on the overcoat film 21a so as to cover the common electrode 20.

On the other hand, on the inner surface of the active matrix substrate 5 (that is, the surface facing the color filter substrate 4), an interlayer insulating film 21b as a second insulating film is formed. On the interlayer insulating film 21b, a pixel electrode 19 and a second alignment film 22b are formed so as to cover the pixel electrode 19.

Further, a sealing material F is provided on the outer peripheral portions of the color filter substrate 4 and the active matrix substrate 5 to seal the liquid crystal layer LC. Specifically, in the sealing material F, the outer peripheral portion F1 is provided on the overcoat film 21a and the interlayer insulating film 21b, and the inner peripheral portion F2 is provided on the first and

second alignment films

22a and 22b. Yes. Further, in the sealing material F, as shown in FIG. 4, the thickness of the outer peripheral portion F1 (the vertical dimension in FIG. 4 (the dimension in the direction perpendicular to the pair of substrates)) is the thickness of the inner peripheral portion F2. It is larger than that.

As the overcoat film 21a and the interlayer insulating film 21b, for example, an organic planarizing film made of a transparent synthetic resin is used. For example, transparent polyimide films are used as the first and

second alignment films

22a and 22b.

Also, as the sealing material F, for example, a sealing material having a thermal radical polymerization initiator colored in black and a radical polymerizable resin is used. This sealing material adds a thermal radical polymerization initiator to the conventional radical photopolymerization initiator in addition to the radical polymerization resin, thereby reducing the amount of UV irradiation required for photocuring and reducing the amount of heat curing. It is configured so that heat seal curing is possible while suppressing elution of the uncured resin at the time into the liquid crystal layer. As a result, in the liquid crystal panel 2 of the present embodiment, even when the frame is narrowed, the sealing material F is easily cured to form the color filter substrate 4 and the active matrix substrate 5 (a pair of substrates). On the other hand, it can provide firmly. That is, when narrowing the frame, it is difficult to irradiate the sealing material F from the active matrix substrate 5 side provided with a large number of the source wirings S, gate wirings G, and the like with ultraviolet rays. For this reason, it is possible to cure the sealing material F by irradiating ultraviolet rays from the color filter substrate 4 side and irradiating ultraviolet rays in a shorter time than the sealing materials using conventional ultraviolet curing and thermosetting resins. Each of the substrates (color filter substrate 4 and active matrix substrate 5) can be provided firmly.

Specific examples of the thermal radical polymerization initiator include organic peroxide compounds and azo compounds. The radical polymerizable resin is not particularly limited as long as it is a resin having a thermal radical reactive functional group in the molecule.

The sealing material F has an optical density (OpticalOptDensity) value of 3 or more per 1 μm by adding a black pigment or dye to the thermal radical polymerization initiator and the radical polymerizable resin. It is colored. In other words, the sealing material F is colored, for example, black so that the value per 1 μm of the optical density, which is also called the optical density or the absorbance defined by the Lambert-Beer law, is 3 or more.

Specifically, when the wavelength of light is λ, the intensity of incident light to the sealing material F is I0, and the intensity of transmitted light from the sealing material F is I, the Lambert-Beer law Absorbance (optical density) Aλ of λ is obtained by the following equation (1).

Aλ = −log ₁₀ (I / I0) ――― (1)
In the present embodiment, among the light incident on the sealing material F from the light emitting diode 9 of the backlight device 3, at least the light in the visible wavelength range (for example, 360 nm to 830 nm), the above equation (1) The sealing material F is colored black so that the value of the optical density Aλ obtained in step 1 is 3 or more per 1 μm. Thus, in the present embodiment, even when the width of the sealing material F (that is, the horizontal dimension in FIG. 4) is reduced (for example, 1.5 mm), the sealing material F is reduced. It is possible to reliably prevent light from leaking to the outside.

In the liquid crystal panel 2 of the present embodiment configured as described above, a frame-shaped sealing material F is provided on the outer periphery of the color filter substrate 4 and the active matrix substrate 5 as a pair of substrates. Further, the sealing material F is colored so that the optical density value is 3 or more. As a result, in the present embodiment, unlike the conventional example, even when the frame is narrowed, the occurrence of light leakage can be reliably prevented, and the liquid crystal panel 2 excellent in display quality can be configured.

Here, the verification test conducted by the present inventor will be specifically described.

In this verification test, the optical density of the sealing material and the color to be colored were changed, and whether or not light leaked to the outside from the sealing material was examined. Specific examples of the results of the verification test are shown in Table 1.

As shown by “◯” in Table 1, it was confirmed that light could be prevented from leaking outside from the sealing material if the value of the optical density was 3 or more regardless of the colored color. On the other hand, as shown by “x” in Table 1, it was confirmed that light leakage to the outside could not be reliably prevented by simply coloring in black.

Further, in the present embodiment, the sealing material F is configured such that the thickness of the outer peripheral portion F1 is larger than the thickness of the inner peripheral portion F2. Thereby, in the present embodiment, even when the frame is narrowed, the occurrence of light leakage can be prevented more reliably.

In the present embodiment, an overcoat film 21a and an interlayer insulating film 21b (first and second insulating films) provided on the surfaces of the color filter substrate 4 and the active matrix substrate 5 are provided. An outer peripheral portion F1 is provided on the overcoat film 21a and the interlayer insulating film 21b. Thereby, in this embodiment, the adhesive strength of the sealing material F can be improved with respect to each substrate (a pair of each substrate) of the color filter substrate 4 and the active matrix substrate 5.

Further, in the present embodiment, the liquid crystal panel 2 having excellent display quality that can reliably prevent the occurrence of light leakage even when narrowing the frame is used. A simple liquid crystal display device (display device) 1 can be easily configured.

[Second Embodiment]
FIG. 5 is a cross-sectional view for explaining a main configuration of a liquid crystal panel according to the second embodiment of the present invention.

In the figure, the main difference between this embodiment and the first embodiment is that the black matrix film is provided on the surface of the color filter substrate, and the inner peripheral portion of the sealing material and the black matrix film overlap each other. The dimension of is set to less than 0.1 mm. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

That is, as shown in FIG. 5, in the liquid crystal panel 2 of the present embodiment, a black matrix film 23 is provided on the inner surface of the color filter substrate 4, and an overcoat is formed so as to cover the black matrix film 23. A film 21a is formed.

Further, in the liquid crystal panel 2 of the present embodiment, the overlap dimension (indicated by “H1” in FIG. 5) where the inner peripheral portion F2 of the sealing material F and the black matrix film 23 overlap each other is set to be less than 0.1 mm. Has been.

With the above configuration, the present embodiment can achieve the same operations and effects as the first embodiment. In the present embodiment, since the black matrix film 23 is provided on the inner surface of the color filter substrate 4, the boundary accuracy between the effective display area A and the frame area of the liquid crystal panel 2 can be improved. In this embodiment, since the overlap dimension H1 is set to be less than 0.1 mm, even when the sealing material F is cured by irradiating the sealing material F with ultraviolet rays from the color filter substrate 4 side. The black matrix film 23 can be prevented from interfering with ultraviolet irradiation. As a result, in the present embodiment, the sealing material F can be firmly provided on each of the color filter substrate 4 and the active matrix substrate 5 (a pair of substrates).

When the overlap dimension H1 is set to 0.1 mm or more, it becomes difficult to obtain ultraviolet radiation shortage (that is, insufficient amount of irradiated ultraviolet light) and thermal radical reaction, and the sealing material F is provided firmly. May be difficult.

[Third Embodiment]
FIG. 6 is a cross-sectional view for explaining the main configuration of a liquid crystal panel according to the third embodiment of the present invention.

In the figure, the main difference between this embodiment and the first embodiment is that an outer peripheral portion of a sealing material is provided on each surface of the color filter substrate and the active matrix substrate. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

That is, as shown in FIG. 6, in the liquid crystal panel 2 of the present embodiment, the outer peripheral portion F1 of the sealing material F is provided on each inner surface of the color filter substrate 4 and the active matrix substrate 5. In other words, unlike the liquid crystal panel 2 of the first embodiment, the overcoat film 21a and the interlayer insulating film 21b are not provided, and the outer peripheral portion F1 of the sealing material F is the color filter substrate. 4 and each inner surface of the active matrix substrate 5 are provided directly.

With the above configuration, the present embodiment can achieve the same operations and effects as the first embodiment. In the present embodiment, since the outer peripheral portion F1 of the sealing material F is directly provided on the inner surfaces of the color filter substrate 4 and the active matrix substrate 5, each of the color filter substrate 4 and the active matrix substrate 5 is provided. The adhesive strength of the sealing material F can be further improved with respect to the substrates (a pair of substrates).

[Fourth Embodiment]
FIG. 7 is a plan view for explaining a sealing material provided in a liquid crystal panel according to the fourth embodiment of the present invention. FIG. 8 is a cross-sectional view for explaining a main configuration of the liquid crystal panel shown in FIG.

In the figure, the main difference between this embodiment and the first embodiment is that the outer peripheral portion of the sealing material is made to coincide with each end of the color filter substrate and the active matrix substrate. In addition, about the element which is common in the said 1st Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

That is, as shown in FIGS. 7 and 8, in the liquid crystal panel 2 of the present embodiment, the outer peripheral portion F1 of the sealing material F is an end portion of the liquid crystal panel 2, that is, each end portion of the color filter substrate 4 and the active matrix substrate 5. It is provided to match.

Specifically, in the liquid crystal panel 2 of the present embodiment, the overcoat film 21a ′ and the interlayer insulating film 21b ′ are formed so as to coincide with the end portions of the corresponding color filter substrate 4 and active matrix substrate 5. . For example, a transparent thermosetting resin is used for the overcoat film 21a 'and the interlayer insulating film 21b'. In the sealing material F, the outer peripheral portion F1 is provided on the overcoat film 21a 'and the interlayer insulating film 21b'.

With the above configuration, the present embodiment can achieve the same operations and effects as the first embodiment. In this embodiment, the sealing material F is provided so that the outer peripheral portion F1 thereof coincides with each end of the color filter substrate 4 and the active matrix substrate 5. Thereby, in this embodiment, the narrow frame of the liquid crystal panel 2 can be achieved easily.

[Fifth Embodiment]
FIG. 9 is a cross-sectional view for explaining the main configuration of a liquid crystal panel according to the fifth embodiment of the present invention.

In the figure, the main difference between the present embodiment and the fourth embodiment is that an ultraviolet curable resin is used for the overcoat film and the interlayer insulating film. In addition, about the element which is common in the said 4th Embodiment, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

That is, as shown in FIG. 9, in the liquid crystal panel 2 of this embodiment, the overcoat film 21a "and the interlayer insulating film 21b" are provided on the inner surfaces of the corresponding color filter substrate 4 and active matrix substrate 5. . For these overcoat film 21a "and interlayer insulating film 21b", for example, a transparent ultraviolet curable resin is used. As shown in FIG. 8, the first and second overcoat films 21a "and the interlayer insulating film 21b" are formed so as to coincide with the end portions of the corresponding color filter substrate 4 and active matrix substrate 5. May be.

Further, as shown in FIG. 9, in the sealing material F, the outer peripheral portion F <b> 1 is provided on the inner surfaces of the color filter substrate 4 and the active matrix substrate 5. The first inner peripheral portion F2 is provided on the overcoat film 21a "and the interlayer insulating film 21b", and the second inner peripheral portion F3 is provided on the first and

second alignment films

22a and 22b. Yes.

With the above configuration, the present embodiment can achieve the same operations and effects as the fourth embodiment.

It should be noted that all of the above embodiments are illustrative and not restrictive. The technical scope of the present invention is defined by the claims, and all modifications within the scope equivalent to the configurations described therein are also included in the technical scope of the present invention.

For example, in the above description, the case where the present invention is applied to a transmissive liquid crystal display device has been described. However, the liquid crystal panel of the present invention is not limited to this, for example, a transflective liquid crystal display device, or The liquid crystal panel of the present invention can be suitably used for a projection display device using the liquid crystal panel as a light valve.

In the above description, the case where a sealing material having a thermal radical polymerization initiator and a radical polymerizable resin is used as the sealing material has been described. However, the sealing material of the present invention is not limited to this, for example, An ultraviolet curable resin type, a thermosetting resin type, and a combined resin type can also be used.

However, it is preferable to use a sealing material having a thermal radical polymerization initiator and a radical polymerizable resin as in each of the above-described embodiments because the sealing material can be easily and firmly provided. That is, even when it becomes difficult to irradiate the sealing material with ultraviolet rays by narrowing the frame, the case of using the sealing material having the thermal radical polymerization initiator and the radical polymerizable resin is more suitable for the pair of substrates. This is because the sealing material can be easily hardened and firmly provided, and the components of the sealing material can be easily prevented from eluting into the liquid crystal layer.

In addition to the above description, the first to fifth embodiments may be appropriately combined.

The present invention is useful for a liquid crystal panel excellent in display quality capable of reliably preventing the occurrence of light leakage even when narrowing the frame and a display device using the same.

2 LCD panel 4 Color filter substrate (a pair of substrates)
5 Active matrix substrates (a pair of substrates)
21a, 21a ′, 21a ″ overcoat film (first insulating film)
21b, 21b ′, 21b ″ interlayer insulating film (second insulating film)
LC Liquid crystal layer F Seal material F1 Outer peripheral part F2, F3 Inner peripheral part

Claims

A liquid crystal panel having a pair of substrates and a liquid crystal layer provided between the pair of substrates,
The outer peripheral portion of the pair of substrates is provided in a frame shape, and includes a sealing material for sealing the liquid crystal layer,
The sealing material is colored so that the optical density value is 3 or more.
A liquid crystal panel characterized by that.
The liquid crystal panel according to claim 1, wherein the sealing material is configured such that the outer peripheral portion has a greater thickness than the inner peripheral portion.
Comprising first and second insulating films respectively provided on the surfaces of the pair of substrates;
The liquid crystal panel according to claim 1, wherein an outer peripheral portion of the sealing material is provided on the first and second insulating films.
The liquid crystal panel according to claim 1 or 2, wherein an outer peripheral portion of the sealing material is provided on a surface of each of the pair of substrates.
A display device using the liquid crystal panel according to any one of claims 1 to 4.