JP2012108553A - Liquid crystal display device - Google Patents

Liquid crystal display device Download PDF

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JP2012108553A
JP2012108553A JP2012042255A JP2012042255A JP2012108553A JP 2012108553 A JP2012108553 A JP 2012108553A JP 2012042255 A JP2012042255 A JP 2012042255A JP 2012042255 A JP2012042255 A JP 2012042255A JP 2012108553 A JP2012108553 A JP 2012108553A
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liquid crystal
substrate
display device
crystal display
pixel
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JP2012042255A
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Inventor
Masaya Adachi
Shinichi Komura
Shinichiro Oka
真一 小村
真一郎 岡
昌哉 足立
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Japan Display East Co Ltd
Panasonic Liquid Crystal Display Co Ltd
パナソニック液晶ディスプレイ株式会社
株式会社ジャパンディスプレイイースト
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Priority to JP2012042255A priority Critical patent/JP2012108553A/en
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Abstract

In a transflective liquid crystal display device, a liquid crystal display device capable of displaying a high-quality image without complicating the pixel structure and suppressing a decrease in aperture ratio in one pixel is provided. is there.
A liquid crystal layer sandwiched between a first substrate and a second substrate, a first polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the first substrate, A second polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the second substrate, the second substrate having a pixel electrode on the liquid crystal layer side, The substrate has a common electrode on the liquid crystal layer side and is a liquid crystal display device including a plurality of pixels, and each pixel of the plurality of pixels includes a first subpixel and a second subpixel. The ratio of the common electrode occupying the opening of the first subpixel and the ratio of the common electrode occupying the opening of the second subpixel are different in one pixel plane. The ratio of the common electrode is 0% or more and 100% or less.
[Selection] Figure 19

Description

  The present invention relates to a liquid crystal display device, and more particularly to a transflective liquid crystal display device.

  Unlike self-luminous displays such as CRT (Cathode Ray Tube) and PDP (Plasma Display Panel), liquid crystal display devices are non-luminous displays that display images by adjusting the amount of transmitted light. is there. The liquid crystal display device has features such as thinness, light weight, and low power consumption.

  In a liquid crystal display device, a light source (hereinafter referred to as a backlight) is arranged on the back, and a transmissive liquid crystal display device that displays an image by adjusting the amount of light transmitted through the light source, and external light such as room lighting and sunlight. There is a reflection type liquid crystal display device that displays an image by allowing external light to enter from the front side of the display and adjusting the amount of reflected light. In addition, there is a liquid crystal display device (hereinafter referred to as a transflective liquid crystal display device) that can be used as a reflective display device in a bright environment and a transmissive display device in a dark environment. The transflective liquid crystal display device has both reflective and transmissive display functions, and can reduce power consumption by turning off the backlight in a bright environment. In a dark environment, it can be seen by turning on the backlight. That is, it is suitable for a liquid crystal display device of a portable device such as a mobile phone or a digital camera that is assumed to be used in various lighting environments.

  In the transflective liquid crystal display device, as described in Patent Document 1, it is necessary to arrange a transmission region and a reflection region independently in a pixel and to design each retardation optimally. This is achieved by providing a step in the reflective region and making the thickness of the liquid crystal layer in the reflective region approximately half the thickness of the liquid crystal layer in the transmissive region.

  In addition, as described in Patent Document 2, a vertical alignment (hereinafter referred to as VA) type transmissive liquid crystal display device is divided into two pixels to have electro-optical characteristics different in the two regions. Thus, a method of reducing the γ shift when observed from an oblique direction has been proposed. The γ characteristic is a numerical value representing the characteristic of gradation, and the fact that this numerical value is different from the observing direction indicates that the gradation is different depending on the observing direction.

JP 2000-187220 A JP 2004-38165 A

  As described above, the transflective liquid crystal display device can obtain good visibility in various lighting environments. However, in order to optimize the retardation of the transmission region and the reflection region, it is necessary to provide a step structure in the reflection region. This step structure has a problem that the effective area in the pixel is reduced, and the contrast ratio is lowered or the aperture ratio is lowered due to the alignment disorder of the liquid crystal due to the step structure.

  In the VA liquid crystal display device, a pixel is divided into two parts to reduce the γ shift, and a new pixel capacitance is provided or a new TFT is provided in order to have different electro-optical characteristics. It is necessary to provide it, and the aperture ratio reduction and high cost are problems.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is to display a high-quality image within one pixel without complicating the pixel structure and suppressing a decrease in aperture ratio. It is to provide a possible liquid crystal display device.

  In order to solve the above problems, the present invention is arranged such that the liquid crystal layer sandwiched between the first substrate and the second substrate, and the side opposite to the side where the liquid crystal layer is disposed with respect to the first substrate. A first polarizing plate and a second polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the second substrate, and the second substrate has a pixel on the liquid crystal layer side. The first substrate has a common electrode on the liquid crystal layer side, and is a liquid crystal display device including a plurality of pixels. Each pixel of the plurality of pixels includes a first sub-pixel and a second sub-pixel. The ratio of the common electrode occupying the opening of the first subpixel and the ratio of the common electrode occupying the opening of the second subpixel are different in one pixel plane. The ratio of the common electrode in the pixel opening is 0% or more and 100% or less.

  Further, in the configuration of the transflective liquid crystal display device similar to the above, the ratio of the pixel electrode in the opening of the first subpixel and the pixel electrode in the opening of the second subpixel in one pixel plane And the ratio of the pixel electrode in the opening of the first subpixel is 0% or more and 100% or less.

  Further, in the configuration of the transflective liquid crystal display device similar to the above, the ratio of the common electrode occupying the opening of the first subpixel and the common electrode occupying the opening of the second subpixel in one pixel plane The ratio of the common electrode occupying the opening of the first subpixel is 0% or more and 100% or less, and the pixel electrode occupying the opening of the first subpixel is within one pixel plane. The ratio is different from the ratio of the pixel electrode in the opening of the second subpixel, and the ratio of the pixel electrode in the opening of the first subpixel is 0% to 100%.

  A liquid crystal display device capable of displaying a high-quality image can be provided without complicating the pixel structure and suppressing a decrease in the aperture ratio in one pixel.

It is a figure which shows the cross-section of one Example of the liquid crystal display device based on this invention. It is a figure which shows the relationship between the optical axis of the phase difference plate of FIG. 1, and a polarizing plate. It is a figure which shows one Example of the cross-sectional structure of the liquid crystal cell of FIG. It is a figure which shows one equivalent circuit of the pixel display area of FIG. FIG. 4 is a diagram showing an example of one plane of one pixel of the second substrate of FIG. 3. FIG. 4 is a diagram illustrating an example of one plane of one pixel of the first substrate in FIG. 3. It is a figure which shows the other example of a plane of 1 pixel of the 1st board | substrate of FIG. It is a figure which shows the relationship between the phase difference plate of FIG. 9, and the optical axis of a polarizing plate. It is a figure which shows the other Example of the cross-section of the liquid crystal cell of FIG. FIG. 10 is a diagram illustrating an example of one plane of one pixel of the first substrate in FIG. 9. FIG. 10 is a diagram illustrating an example of one plane of one pixel of the second substrate in FIG. 9. It is a figure which shows the other Example of the cross-section of the liquid crystal cell of FIG. FIG. 13 is a diagram illustrating an example of one plane of one pixel of the first substrate in FIG. 12. FIG. 13 is a diagram illustrating an example of one plane of one pixel of the second substrate in FIG. 12. It is a figure which shows the other example of a plane of 1 pixel of the 2nd board | substrate of FIG. It is a figure which shows the cross-section of the 2nd board | substrate of FIG. It is a figure which shows the cross-section of the other Example of the liquid crystal display device based on this invention. It is a figure which shows one Example of the cross-section of the liquid crystal cell of FIG. FIG. 19 is a diagram illustrating an example of one plane of one pixel of the first substrate in FIG. 18. FIG. 19 is a diagram illustrating an example of one plane of one pixel of the second substrate in FIG. 18. It is a figure explaining the voltage-transmittance characteristic of Example 1 of this invention. It is a figure explaining the liquid crystal orientation of Example 3 of this invention. It is a figure explaining the voltage-transmittance characteristic of Example 1 and Example 6 of this invention. It is a figure explaining the voltage-transmittance characteristic of Example 7 of this invention. It is the figure which showed the (gamma) characteristic by the structure of the liquid crystal display device of Example 7 of this invention.

  Each example will be described below with reference to the drawings.

The present embodiment will be described with reference to the drawings. In this embodiment, the liquid crystal molecules are aligned in the vertical direction with respect to the substrate when no voltage is applied, and are aligned substantially horizontally with respect to the substrate when a voltage is applied. The liquid crystal display device is characterized in that the ratio of the common electrode 21 occupying the opening in each region is different, and the ratio of the common electrode 21 occupying the opening in the reflection region is 0% or more and less than 100%. By using this liquid crystal display device, the ratio d R / d T between the thickness d R of the reflection region and the thickness d T of the transmission region can be set to 0.5 or more and 1 or less. As a result, the aperture ratio can be improved, and further, the production process is reduced, leading to a cost reduction.

  Furthermore, the ratio of the electrode in the opening of the reflection region is made smaller than the ratio of the electrode in the opening of the transmission region. As a result, it is possible to make a difference in the effective voltage applied to the liquid crystal layer in the opening area of the transmission area and the reflection area. That is, by reducing the effective voltage applied to the liquid crystal layer in the reflective region, the in-plane retardation of the liquid crystal layer in the reflective region is halved relative to the in-plane retardation of the liquid crystal layer in the transmissive region. can do. Therefore, the step provided in the reflection region, which was the above problem, can be eliminated, and a step-less transflective liquid crystal display device can be achieved.

  Further, since the sub-pixel can be formed by a similar method, the γ characteristic can be improved in the VA liquid crystal display device.

  Note that the openings described herein are defined as areas where light is transmitted in the transmissive area and areas where light is reflected in the reflective area, in one pixel.

  FIG. 1 is a schematic view showing a cross-sectional structure of the liquid crystal display device of this embodiment.

  The liquid crystal display device according to the present embodiment includes a liquid crystal panel having a pair of polarizing plates and a backlight. Specifically, the liquid crystal panel includes a first polarizing plate 11 and a second polarizing plate 12. It is comprised by the liquid crystal cell 10 arrange | positioned between. Between the first polarizing plate 11 and the liquid crystal cell 10, a first retardation plate 13, a second retardation plate 14, and a first negative C plate (hereinafter referred to as negative C-Plate) 34 are arranged. The Between the second polarizing plate 12 and the liquid crystal cell 10, a second negative C-Plate 35, a third retardation plate 15, and a fourth retardation plate 16 are disposed. Further, a backlight unit 17 is disposed on the opposite side of the second polarizing plate 12 from the liquid crystal cell 10.

  The first polarizing plate 11 and the second polarizing plate 12 are composed of a Poly Vinyl Alcohol (hereinafter referred to as PVA) layer in which iodine is adsorbed and stretched, and a protective film for protecting it. In order to achieve normally closed, the absorption axis of the first polarizing plate 11 and the absorption axis of the second polarizing plate 12 are arranged substantially perpendicularly.

  The phase difference between the first phase difference plate 13 and the fourth phase difference plate 16 is ½ wavelength. The first phase difference plate 13 and the fourth phase difference plate 16 are polycarbonate, norbornene resin, or the like. Is used.

  The phase difference between the second phase difference plate 14 and the third phase difference plate 15 is ¼ wavelength, and the second phase difference plate 14 and the third phase difference plate 15 are polycarbonate, norbornene resin, or the like. Is used.

  A wide-band quarter-wave plate having a small wavelength dependence by combining the first retardation plate 13 and the second retardation plate 14 and the combination of the third retardation plate 15 and the fourth retardation plate 16 is obtained. Can be achieved.

  The first negative C-Plate 34 and the second negative C-Plate 35 are arranged to reduce light leakage when observed from an oblique direction during black display. For the first negative C-Plate 34 and the second negative C-Plate 35, materials such as cellulose acylates such as cellulose acetate and cellulose acetate butyrate, polycarbonate, polyolefin, polystyrene, and polyester can be used. Overall, cellulose acylates are desirable, and cellulose acetate is particularly desirable. It is desirable that the retardation Rth in the thickness direction of the first negative C-Plate 34 and the second negative C-Plate 35 is substantially equal. Rth is defined by the following formula (1).

Here n x, n y, n z is the principal axis direction refractive index of the refractive index ellipsoid, n x, n y is a refractive index in the in-plane direction, n z is a refractive index in the thickness direction Yes. D is the thickness of the retardation plate.

  The negative C-Plate is a medium having a refractive index substantially isotropic in the plane and having a refractive index in the thickness direction smaller than that in the in-plane direction.

  The backlight unit 17 includes an LED that is a light source, a light guide plate, a diffusion plate, and the like. The LED is preferably white, but RGB three-color LEDs can also be used. The backlight unit 17 only needs to be able to illuminate the liquid crystal cell from the back surface, and the light source and structure are not limited thereto. For example, the effect of the present invention can be obtained even when CCFL is used as the light source.

  FIG. 2 is a schematic diagram showing the relationship between the retardation plate and the optical axis of the polarizing plate according to the liquid crystal display device of this example.

  In order to achieve a broadband circularly polarizing plate, it is necessary to dispose a retardation plate as shown in FIG.

  The slow axes of the first retardation plate 13 and the fourth retardation plate 16, and the slow axes of the second retardation plate 14 and the third retardation plate 15 are substantially orthogonal to each other. Furthermore, the relationship between the absorption axes of the first polarizing plate 11 and the second polarizing plate 12 and the slow axes of the first to fourth retardation plates is that the absorption axis of the first polarizing plate 11 is 0 degree. The slow axis of the first retardation film 13 is −105 degrees, the slow axis of the second retardation film 14 is 15 degrees, the slow axis of the third retardation film 15 is −75 degrees, The retardation axis of the retardation plate 16 is −15 degrees, and the absorption axis of the second polarizing plate 12 is −90 degrees.

  The illustrated retardation plate arrangement is an example and is not limited to this.

  FIG. 3 is a cross-sectional view of the liquid crystal cell 10 of FIG. 1, and is a schematic diagram illustrating a cross-sectional structure taken along the line AA ′ of FIG. 5 and the portion of FIG. 6 corresponding to the line A-A ′. It is.

  The transflective liquid crystal display device of this embodiment has a transmissive region (T portion in FIG. 3) and a reflective region (R portion in FIG. 3) in one pixel. The liquid crystal cell 10 includes a first substrate 18, a liquid crystal layer 20, and a second substrate 19, and the first substrate 18 and the second substrate 19 sandwich the liquid crystal layer 20. The first substrate 18 includes a color filter 23, a common electrode 21, and a first alignment film 24 on the liquid crystal layer 20 side. The second substrate 19 has a pixel electrode 22 and a second alignment film 25 on the liquid crystal layer 20 side. A reflection plate 26 is disposed in the reflection region of the second substrate 19 on the liquid crystal layer 20 side. An alignment control protrusion 36 is provided on the liquid crystal layer 20 side of the common electrode 21. In addition, a light shielding portion 37 is disposed on the liquid crystal layer 20 side of the second substrate 19, and a step portion 44 is provided in a region corresponding to the reflective region on the liquid crystal layer 20 side of the first substrate 18.

  In addition, the 1st board | substrate 18 and the 2nd board | substrate 19 are transparent in order to permeate | transmit light, For example, glass and a polymer film can be used. The polymer film is particularly preferably plastic or polyethersulfone (hereinafter referred to as PES). However, since plastic and PES allow air to pass through, it is necessary to form a gas barrier on the substrate surface. The gas barrier is preferably formed of a silicon nitride film.

The liquid crystal layer 20 is composed of a liquid crystal composition exhibiting negative dielectric anisotropy in which the dielectric constant in the major axis direction of the liquid crystal molecules is smaller than that in the minor axis direction. As the liquid crystal material of the liquid crystal layer 20, a material showing a nematic phase in a wide range including a room temperature range is used. Further, under the driving conditions using TFTs, for example, with a resolution of QVGA (240 lines) and a driving frequency of 60 Hz, the transmittance is sufficiently maintained during the holding period and exhibits a high resistivity enough not to cause flicker. use. That is, the resistivity of the liquid crystal layer 20 is desirably 10 12 Ωcm 2 or more, and particularly desirably 10 13 Ωcm 2 or more.

  The first alignment film 24 and the second alignment film 25 have a function of vertically aligning liquid crystal molecules on the substrate surface. The first alignment film 24 and the second alignment film 25 are preferably polyimide organic films, but may be SiO vertical vapor deposition films, surfactants, chromium complexes, or the like.

  The alignment control protrusions 36 are arranged to define the direction of liquid crystal molecules that fall when an electric field is applied. It is necessary to define the direction in which vertically aligned liquid crystal molecules are tilted by voltage. Here, protrusions are used as an example, but the present invention is not limited to this. For example, electrode slits may be used. In the peripheral portion of the alignment control protrusion 36, the alignment direction of the liquid crystal molecules in the liquid crystal layer 20 is inclined with respect to the substrate normal direction according to the inclination of the alignment control protrusion 36. The alignment control protrusion 36 is formed of, for example, an acrylic resin. This acrylic resin can form protrusions by photoetching. In FIG. 5, two alignment control protrusions 36 are arranged in one pixel. However, the present invention is not limited to this, and one or more protrusions for alignment control may be arranged in one pixel. It is desirable that 36 are arranged at substantially equal intervals.

  The light shielding portion 37 is arranged to block light leakage caused by the liquid crystal alignment disorder around the alignment control protrusion 36. The material used for the light shielding portion 37 can be an opaque material such as metal, and is preferably chromium, tantalum-molybdenum, tantalum, aluminum, copper, or the like.

  The color filter 23 arranges a red region / a green region / a blue region through which any one of red, green, and blue light is transmitted for each pixel. For example, such an arrangement includes a stripe arrangement and a delta arrangement.

  The common electrode 21 is made of a transparent conductive material, and for example, indium tin oxide (ITO) or zinc oxide (ZnO) is used.

  The reflection plate 26 is provided to reflect external light incident from the first substrate 18 side during reflection display. The reflector 26 has irregularities to diffuse the reflected light.

  In addition, since the reflection plate 26 is connected to the pixel electrode 22 so that the transmission region and the reflection region have the same potential, the reflection plate 26 can also serve as a pixel electrode in the reflection region and is formed of a highly conductive metal. Is done. In particular, the reflector 26 is made of silver, aluminum, or the like, which has a high reflectance in the visible region and is excellent in conductivity.

  The step portion 44 is made of a resist material, and is installed to match the voltage-transmittance characteristic of the transmission region and the voltage-reflectance characteristic of the reflection region.

  Next, the pixel electrode 22 will be described with reference to FIGS. 4 and 5.

  FIG. 4 is a diagram showing an equivalent circuit of pixels arranged in a matrix constituting the pixel display area. The pixel region has a signal wiring 28 and a scanning wiring 29. A region surrounded by the signal wiring 28 and the scanning wiring 29 is a pixel, and the signal wiring and the scanning wiring are arranged substantially orthogonal to each other, and at least one thin film transistor (hereinafter referred to as TFT) is provided at the intersection. Have. The TFT 30 is connected to the through hole 27, and the through hole 27 is connected to the pixel electrode 22 although not shown in FIG. In addition, at least one storage capacitor 31 is disposed in one pixel to prevent the held image signal from leaking.

  Here, the active matrix driving using the TFT 30 in one pixel is described as an example. However, in this embodiment, the same effect can be obtained by the passive matrix driving.

  A voltage signal for controlling the liquid crystal layer 20 is applied to the signal wiring 28, and a signal for controlling the TFT 30 is applied to the scanning wiring 29. The material of the signal wiring 28 and the scanning wiring 29 is preferably a low-resistance conductive material, such as chromium, tantalum-molybdenum, tantalum, aluminum, copper, or the like.

  FIG. 5 is a plan view showing a schematic configuration of one pixel of the second substrate 19.

  A reflection area and a transmission area are formed in one pixel, and the transmission area is further divided into two. In FIG. 5, the second transmissive region, the first transmissive region, and the reflective region are formed in this order from the TFT side (the side on which the source electrode 33 is disposed), but this is not restrictive. The TFT 30 has an inverted staggered structure, and has a semiconductor layer 32 in a channel portion thereof and a through hole 27 for connecting the pixel electrode 22 and the source electrode 33.

  The pixel electrode 22 is disposed to apply an electric field to the liquid crystal layer 20 and is made of a transparent conductive material like the common electrode 21. For example, indium tin oxide (ITO) or zinc oxide (ZnO) is used.

  In this embodiment, the liquid crystal molecules are aligned in the vertical direction with respect to the substrate when no voltage is applied, and are aligned substantially horizontally with respect to the substrate when a voltage is applied. The liquid crystal display device is characterized in that the ratio of the common electrode 21 occupying the opening in each region is different, and the ratio of the common electrode 21 occupying the opening in the reflection region is 0% or more and less than 100%.

As a result, a difference occurs in the effective voltage applied to the liquid crystal layer 20 in the transmissive region and the reflective region. Therefore, Δn T > Δn R at the time of voltage application, and the condition for matching the voltage-transmittance (reflectance) characteristics of the transmission region and the reflection region is d R > d T / 2 (particularly, d R = d T In order to achieve this, it is desirable that 2Δn T = Δn R ).

  As described above, it is possible to provide a liquid crystal display device capable of displaying a high-quality image without complicating the pixel structure and suppressing a decrease in aperture ratio.

  Specifically, a structure for causing a difference in effective voltage applied to the liquid crystal layer 20 in the transmissive region and the reflective region will be described. Such a difference can be achieved, for example, by using the common electrode 21 as shown in FIG.

  FIG. 6 is a plan view showing a schematic configuration of one pixel of the first substrate 18. The reflection region of the common electrode 21 shown in FIG. 6 has a comb-like electrode portion 41. The shape of the common electrode 21 is not limited to the comb-like electrode portion 41, and may be a mesh-like electrode portion 42 as shown in FIG.

  Next, FIG. 21 shows the result of theoretical calculation for the voltage-transmittance characteristics. FIG. 21A shows the case where the ratio of the common electrode 21 occupying the opening is 60%, and FIG. 21B shows the case where the ratio of the common electrode 21 occupying the opening is 100%.

In this case, in FIG. 21A, the threshold voltage and the voltage indicating halftone shift to the high voltage side as compared to FIG. 21B. For example, when 4V is applied, (a) is about 82% of the transmittance of (b). That is, by using (a) as the common electrode 21 in the reflective region and (b) as the common electrode 21 in the transmissive region, a relationship of Δn T > Δn R can be realized when a voltage is applied. Therefore, the relationship of d R / d T > 0.5 can be achieved by the configuration of the present embodiment.

  Next, another embodiment of the liquid crystal display device of the present invention will be described.

  In the present embodiment, an electrically controlled birefringence (hereinafter referred to as ECB) type transflective liquid crystal in which liquid crystal molecules are aligned substantially horizontally with respect to the substrate when no voltage is applied, and is aligned substantially vertically with respect to the substrate when a voltage is applied. In the display device, the ratio of the common electrode 21 occupying the opening is different between the transmission region and the reflection region, and the ratio of the common electrode 21 occupying the opening of the reflection region is 0% or more and less than 100%. It describes a liquid crystal display device.

By using this liquid crystal display device, the ratio d R / d T between the thickness d R of the reflection region and the thickness d T of the transmission region can be set to 0.5 or more and 1 or less. As a result, the aperture ratio can be improved, and further, the production process is reduced, leading to a cost reduction.

  The cross-sectional structure of the liquid crystal display device of this embodiment is the same as that of FIG. 1, but the liquid crystal cell 10 is changed from the VA system to the ECB system.

  FIG. 8 is a schematic diagram showing the relationship between the retardation plate and the optical axis of the polarizing plate in the normally closed liquid crystal display device of this example.

  In order to achieve a broadband circularly polarizing plate having a small wavelength dependence, it is necessary to dispose a retardation plate as shown in FIG. The slow axes of the first retardation plate 13 and the fourth retardation plate 16, and the slow axes of the second retardation plate 14 and the third retardation plate 15 are substantially orthogonal to each other. Furthermore, the relationship between the absorption axes of the first polarizing plate 11 and the second polarizing plate 12 and the slow axes of the first to fourth retardation plates is that the absorption axis of the first polarizing plate 11 is 0 degree. The slow axis of the first retardation film 13 is −105 degrees, the slow axis of the second retardation film 14 is 15 degrees, the slow axis of the third retardation film 15 is −75 degrees, The retardation plate 16 has a slow axis of −15 degrees, and the second polarizing plate 12 has an absorption axis of −90 degrees.

  Next, FIG. 9 shows another cross-sectional view of the liquid crystal cell 10 of FIG. 1, and is a cross-sectional structure taken along the line BB ′ of FIG. 11 and the portion of FIG. 10 corresponding to the line BB ′. FIG.

  The transflective liquid crystal display device of this embodiment has a transmissive region (T portion in FIG. 9) and a reflective region (R portion in FIG. 9) in one pixel. The liquid crystal cell 10 includes a first substrate 18 and a second substrate 19, and the liquid crystal layer 20 is sandwiched between the pair of substrates. The first substrate 18 has a color filter 23, a common electrode 21, and a first alignment film 24 on the liquid crystal layer 20 side, and the second substrate 19 has a pixel electrode 22 and a second alignment film 25 on the liquid crystal layer 20 side. Have In addition, a reflection plate 26 is disposed in the reflection region on the liquid crystal layer 20 side of the second substrate 19, and a step portion 44 is provided in the reflection region on the liquid crystal layer 20 side of the first substrate 18.

The liquid crystal layer 20 is composed of a liquid crystal composition exhibiting positive dielectric anisotropy in which the dielectric constant in the major axis direction of the liquid crystal molecules is larger than that in the minor axis direction, and the liquid crystal material is nematic in a wide range including a room temperature range. The one showing the phase is used. Further, under the driving conditions using TFTs, for example, with a resolution of QVGA (240 lines) and a driving frequency of 60 Hz, the transmittance is sufficiently maintained during the holding period and exhibits a high resistivity enough not to cause flicker. use. That is, the resistivity of the liquid crystal layer 20 is desirably 10 12 Ωcm 2 or more, and particularly desirably 10 13 Ωcm 2 or more.

  As for the alignment state of the liquid crystal layer 20, the twist angle between the first substrate 18 and the second substrate 19 is preferably 0 ° or more and 90 ° or less. The liquid crystal layer 20 is aligned in a substantially horizontal alignment with respect to the substrate, but it is desirable that the liquid crystal layer 20 has a pretilt angle of not less than 0 degrees and less than 10 degrees near the interface between the first substrate 18 and the second substrate 19. The illustrated retardation plate arrangement is an example and is not limited to this.

  In this embodiment, the twist angle of the liquid crystal layer 20 is desirably 0 degree, and the phase difference of the liquid crystal layer 20 when no voltage is applied is desirably a quarter wavelength.

  FIG. 10 is a plan view showing a schematic configuration of one pixel of the first substrate 18.

  The reflection region of the common electrode 21 shown in FIG. 10 has a comb-like electrode portion 41. Thus, by using the common electrode 21 that is a comb-like electrode in the reflective region, the electric field applied to the liquid crystal layer 20 in the reflective region becomes smaller than that in the transmissive region. Therefore, when a voltage is applied, a difference occurs in the in-plane retardation of the transmission region and the reflection region. However, this effect can be obtained by making the ratio of the effective pixel area of the reflective region and the area of the electrode smaller than the ratio of the effective pixel area of the transmissive region and the electrode area. The shape of the common electrode 21 is not limited to the comb-like electrode, and may be any electrode structure in which the electrode and the electrode are arranged at a certain interval. Good.

  FIG. 11 is a plan view showing a schematic configuration of one pixel of the second substrate 19. A transflective liquid crystal display device requires a reflector for reflecting incident light. Therefore, as shown in FIG. 11, a reflection plate 26 for reflecting incident light is disposed in the reflection region.

In the above configuration, as in the first embodiment, the ratio of the effective pixel area of the reflection region to the common electrode 21 is made smaller than the ratio of the effective pixel area of the transmission region to the common electrode 21. . As a result, it is possible to make a difference in the effective voltage applied to the liquid crystal layer 20 in the transmissive region and the reflective region. Therefore, Δn T > Δn R at the time of voltage application, and the condition for matching the voltage-transmittance (reflectance) characteristics of the transmission region and the reflection region is d R > d T / 2 from the equation (1), and the aperture ratio is In addition, it is possible to achieve an effect that leads to cost reduction due to the reduction of the production process.

  Next, another embodiment of the liquid crystal display device of the present invention will be described.

The present embodiment is an embodiment having a structure in which high transmittance is achieved by achieving two-domain alignment in a VA-type transflective liquid crystal display device. The liquid crystal display device is characterized in that the ratio of the common electrode 21 occupying the opening in the reflection region is different, and the ratio of the common electrode 21 occupying the opening in the reflection region is 0% or more and less than 100%. By using this liquid crystal display device, the ratio d R / d T between the thickness d R of the reflective region and the thickness d T of the transmissive region can be made 0.5 to 1 inclusive. As a result, the aperture ratio can be improved, and further, the production process is reduced, leading to a cost reduction.

  FIG. 12 shows another cross-sectional view of the liquid crystal cell 10 of FIG. 1 in the VA type transflective liquid crystal display device. FIG. 12 corresponds to the section C-C 'in FIG. 14 and the section C-C' in FIG. It is the schematic which shows the cross-sectional structure cut | disconnected in the part. The basic structure is the same as that of the first embodiment.

  FIG. 13 is a plan view showing a schematic configuration of one pixel of the first substrate 18 of FIG. A first electrode slit 39 for controlling the orientation is provided between the reflective region and the transmissive region. As described in the above-described embodiments, the electrode slits are arranged to define the direction in which the vertically aligned liquid crystal molecules are tilted by the voltage. Further, the common electrode 21 in the reflective region has a comb-like electrode portion 41.

  FIG. 14 is a plan view showing a schematic configuration of one pixel of the second substrate 19 of FIG. A second electrode slit 40 for controlling the orientation is provided at approximately the center of the transmissive region and the reflective region.

  FIG. 22 is a diagram showing the alignment state of the liquid crystal molecules in the liquid crystal layer 20 sandwiched between the pair of substrates of FIG. FIG. 22A shows the alignment state of the liquid crystal before voltage application. FIG. 22B shows the alignment state of the liquid crystal when a voltage sufficiently higher than the threshold voltage is applied. 22 assumes a transmission region, and the ratio of the common electrode 21 in the opening is 100%. 22 assumes a reflection region, and the ratio of the common electrode 21 in the opening is 60%. At this time, the thickness of the liquid crystal layer 20 is 3 μm, and the common electrode 21 is arranged in the direction in which the liquid crystal molecules are tilted at an interval of 5 μm electrodes and 4 μm slits.

With the configuration of this embodiment, a two-domain structure is formed in each of the reflective region and the transmissive region. Further, the tilt angle from the substrate normal direction according to the electric field of the liquid crystal molecules is different between the transmission region (T portion in FIG. 22B) and the reflection region (R portion in FIG. 22B). Therefore, the relationship of Δn T > Δn R is established when a voltage is applied. Therefore, the relationship of d R > d T / 2 can be achieved by the configuration of the present embodiment. Further, since the alignment control protrusion 36 is not required, high aperture ratio and high transmittance can be achieved.

  Next, another embodiment of the second substrate of the liquid crystal display device of the present invention will be described.

In the transflective liquid crystal display device described in this embodiment, the ratio of the pixel electrode 22 occupying the opening is different in each of the transmission region and the reflection region, and the ratio of the pixel electrode 22 in the opening of the reflection region is 0% or more. It is less than 100%. With these configurations, the ratio d R / d T between the thickness d R of the reflection region and the thickness d T of the transmission region can be set to 0.5 or more and 1 or less. As a result, the aperture ratio can be improved, and further, the production process is reduced, leading to a cost reduction.

  The present embodiment is obtained by changing the configuration of the common electrode 21 and the pixel electrode 22 in the second embodiment. Other basic configurations are the same as those in the second embodiment.

In Examples 1 to 3, the ratio of the common electrode 21 occupying the opening is different between the transmission region and the reflection region, and the ratio of the common electrode 21 occupying the opening of the reflection region is 0% or more and less than 100%. Thus, it was shown that there is an effect that the ratio d R / d T of the thickness d R of the reflection region and the thickness d T of the transmission region can be within 0.5 or more and 1 or less. This is because the ratio of the pixel electrode 22 occupying the opening is different in each of the transmission region and the reflection region, and the same effect can be obtained by setting the ratio of the pixel electrode 22 occupying the opening of the reflection region to 0% or more and less than 100%. Obtainable. At this time, the common electrode can be solid.

  FIG. 15 is a plan view showing a schematic configuration of one pixel of the second substrate 19. A reflection plate 26 is disposed in the reflection region of the second substrate 19 on the liquid crystal layer 20 side. The pixel electrode 22 in the reflection region where the reflection plate 26 is disposed has a comb-like electrode portion 41.

  FIG. 16 is a diagram showing a cross-sectional structure of the second substrate 19 between DD ′ shown in FIG. A reflective plate 26 is disposed in the reflective region (R portion in FIG. 16) of the second substrate 19. An insulating layer 43 is disposed between the second substrate 19 and the pixel electrode 22.

  The insulating layer 43 is disposed between the pixel electrode 22 and the reflection plate 26 in order to insulate the pixel electrode 22 and the reflection plate 26. The insulating layer 43 is preferably an insulating material having excellent transparency, and is particularly preferably a polyimide organic film or a silicon nitride film.

  In this embodiment, the ratio of the pixel electrode 22 occupying the opening is different between the transmission area and the reflection area, and the ratio of the pixel electrode 22 occupying the opening of the reflection area is 0% or more and less than 100%. The same effect as in Example 2 can be obtained. Further, in the first to third embodiments, it is necessary to align the position of the reflection plate 26 disposed on the second substrate 19 with the electrode in the reflection region of the first substrate 18. However, since this example is not necessary, an effect of improving the yield can be obtained. In the first and third embodiments, similar effects can be obtained by changing the configuration of the common electrode 21 and the pixel electrode 22 to the present embodiment.

  In the present embodiment, the configuration of the pixel electrode 22 in the fourth embodiment is changed, and other basic configurations are the same as those in the fourth embodiment.

  The reflector 26 used in the transflective liquid crystal display device of this embodiment is made of an insulating material, and is preferably a dielectric multilayer film.

  By configuring the reflection plate 26 with an insulating material in this way, it is provided to insulate the pixel electrode 22 and the reflection plate 26 as compared with the case where the reflection plate 26 is used so as not to be configured with an insulation material as in the fourth embodiment. The insulating layer formed can be eliminated.

  Therefore, while obtaining the same effect as that of the fourth embodiment, the manufacturing process of the liquid crystal display device can be reduced and the cost can be reduced.

  In the transflective liquid crystal display device of this embodiment, the ratio of the common electrode 21 occupying the openings in the transmissive region and the reflective region, which is the feature described in the first to third embodiments, is different. The ratio of the pixel electrode 22 occupying the openings in the transmissive region and the reflective region, which is the feature described in the fourth and fifth embodiments, in the configuration in which the common electrode 21 occupies 0% or more and less than 100%. However, the ratio of the pixel electrode 22 occupying the opening of the reflection area is 0% or more and less than 100%.

  As described above, in this embodiment, the ratio of both the common electrode 21 and the pixel electrode 22 occupying the opening of the reflection region is set to 0% or more and less than 100%, thereby further reducing the manufacturing process of the liquid crystal display device and reducing the manufacturing process. Costing can be obtained. This can be achieved, for example, by changing the pixel electrode 22 shown in FIG. 11 described in the second embodiment to the pixel electrode 22 shown in FIG.

  Here, FIG. 23 shows the result of theoretical calculation of the voltage-transmittance characteristics in the ratio of the reflection region to the openings of the common electrode 21 and the pixel electrode 22.

  23A shows a case where the ratio of the common electrode 21 occupying the opening is 60%, and FIG. 23B shows a case where the ratio of the common electrode 21 occupying the opening is 100%. ) Shows the case where the ratio of the common electrode 21 and the pixel electrode 22 in the opening is 60%.

In this case, the threshold voltage and the voltage indicating halftone shift to the high voltage side in the order of (b) → (a) → (c). For example, when 4V is applied, (c) is about 56% of the transmittance of (b). That is, by setting (c) as the common electrode 21 in the reflective region and (b) as the common electrode 21 in the transmissive region, a relationship of Δn T > Δn R can be realized when a voltage is applied.

Therefore, the configuration of this embodiment can achieve the relationship of d R / d T > 0.5, and can achieve the effect of cost reduction due to the reduction in production process as well as the improvement of the aperture ratio.

  Next, another embodiment of the liquid crystal display device of the present invention will be described with reference to the drawings.

  In this embodiment, in a VA liquid crystal display device having two sub-pixels in one pixel, the common electrode 21 and / or the pixel electrode 22 occupying the opening in one sub-pixel and the other sub-pixel respectively. The configuration of the liquid crystal display device is described in which the ratio is different and the ratio of the common electrode 21 and / or the pixel electrode 22 occupying the opening of one subpixel is 0% or more and less than 100%. is there.

  By using this VA liquid crystal display device, there is an effect that the shift of the γ characteristic when observed from the front and the γ characteristic when observed from an oblique direction can be reduced.

  FIG. 17 is a schematic view showing a cross-sectional structure of the liquid crystal display device of this example.

  The transmissive liquid crystal display device of this embodiment has two subpixels in one pixel (hereinafter referred to as subpixel A and subpixel B). The liquid crystal display device of this embodiment is configured by disposing a liquid crystal cell 10 between a pair of polarizing plates of a first polarizing plate 11 and a second polarizing plate 12. A first negative C-Plate 34 is arranged between the first polarizing plate 11 and the liquid crystal cell 10. A second negative C-Plate 35 is disposed between the second polarizing plate 12 and the liquid crystal cell 10. Further, a backlight unit 17 is disposed on the opposite side of the second polarizing plate 12 from the liquid crystal cell 10.

  FIG. 18 is a schematic view showing a cross-sectional structure taken along the line EE ′ of FIG. 20 and the part of FIG. 19 corresponding to EE ′ shown in FIG. .

  The liquid crystal cell 10 has a pair of substrates, a first substrate 18 and a second substrate 19. The first substrate 18 and the second substrate 19 sandwich the liquid crystal layer 20. The first substrate 18 has a color filter 23, a common electrode 21, and a first alignment film 24 on the side where the liquid crystal layer 20 is disposed. That is, the color filter 23, the common electrode 21, and the first alignment film 24 are provided between the first substrate 18 and the liquid crystal layer 20. The second substrate 19 has a pixel electrode 22 and a second alignment film 25 on the side where the liquid crystal layer 20 is disposed. Further, an alignment control protrusion 36 is provided on the first alignment film 24 on the side where the common electrode 21 is disposed and on the side close to the liquid crystal layer 20. Further, a light shielding portion 37 is disposed on the second alignment film 25 on the side where the second substrate 19 is disposed and on the side corresponding to the protrusion 36 on the side close to the liquid crystal layer 20.

  Here, the alignment control protrusions 36 are arranged in the vicinity of the center of the pixel. However, since the present embodiment can be effective for all VA liquid crystal display devices, for example, the alignment control of the liquid crystal is performed. An electrode slit structure may be used.

  FIG. 19 is a plan view showing a schematic configuration of one pixel of the first substrate 18 of FIG.

  The sub-pixel A of the common electrode 21 shown in FIG. 19 forms a solid electrode (an electrode in which the entire opening of the sub-pixel is covered with an electrode), and the sub-pixel B has a comb-like electrode (a gap at regular intervals). The electrode is formed with a gap. By using the common electrode 21 as shown in FIG. 19, there is a difference in retardation at the time of voltage application between the subpixel A and the subpixel B. This effect can be achieved by setting the ratio of the common electrode in the opening of the subpixel A to 100% and setting the ratio of the common electrode 21 in the opening of the subpixel B to 0% or more and less than 100%. At this time, the same effect can be obtained by changing the ratio of the pixel electrode 22 instead of the common electrode 21. The shape of the common electrode 21 of the sub-pixel B is not limited to the comb-like electrode, and may be, for example, a mesh-like electrode.

  FIG. 20 is a plan view showing a schematic configuration of one pixel of the second substrate 19 of FIG.

  In the vicinity of the center of the sub-pixel A and sub-pixel B, a light-shielding portion 37 is disposed so as to correspond to the alignment control protrusion 36.

  FIG. 24 shows the result of theoretical calculation of the voltage-transmittance characteristics in the structure of this example. (A) in FIG. 24 is a result when the present embodiment is adopted and the ratio of the common electrode 21 occupying the opening is 50% as an example. On the other hand, (b) in FIG. 24 shows the result when the conventional electrode structure is used (the ratio of the common electrode 21 in the opening is 100%).

  Comparing FIG. 24A and FIG. 24B, the voltage at which the transmittance is 50% of the maximum value is about 3.0V for the former and about 3.7V for the latter. Therefore, it can be seen from the relationship between FIGS. 24A and 24B that different electro-optical characteristics can be achieved in the sub-pixel A and the sub-pixel B by the configuration of this embodiment.

  FIG. 25 shows gradation-relative luminance characteristics under each condition, so-called γ characteristics.

  25A shows the condition of FIG. 24A, FIG. 25B shows the condition of FIG. 24B, FIG. 25C shows the configuration of this embodiment, and the subpixel A is shown in FIG. The condition (a) in 24 and the sub-pixel B are γ characteristics under the condition (b) in FIG. The γ characteristic is a direction parallel to the absorption axis of the first polarizing plate 11 when observed from the front of the substrate, and when observed from an angle of 60 degrees with respect to the normal direction of the substrate, Three conditions were shown in the case of observation from an angle of 60 degrees with respect to the substrate normal direction by rotating 45 degrees clockwise from the absorption axis. In FIG. 25 (c), the γ shift is reduced compared to FIGS. 25 (a) and 25 (b).

  As described above, in the present embodiment, in the sub-pixel B, the ratio of the common electrode 21 in the opening is set to 0% or more and less than 100%, so that the γ characteristic when observed from the front and the oblique direction are observed. An effect of improving the shift of the γ characteristic can be obtained.

  Next, in this embodiment, one subpixel and another subpixel are provided in a VA liquid crystal display device having two subpixels in one pixel and using a circularly polarizing plate instead of a normal polarizing plate. The ratio of the common electrode 21 and / or the pixel electrode 22 occupying the opening in each pixel is different, and the ratio of the common electrode 21 and / or the pixel electrode 22 occupying the opening of one subpixel is 0% or more and 100%. The liquid crystal display device which is less than this will be described.

  By using the VA liquid crystal display device using this circularly polarizing plate, there is an effect that the shift of the γ characteristic when observed from the front and the γ characteristic when observed from the oblique direction can be reduced.

  The present embodiment is obtained by changing the configuration of the retardation plate arrangement in the seventh embodiment. The transmission type liquid crystal display device of this example has the same arrangement as the schematic diagram showing the cross-sectional structure of the liquid crystal display device shown in FIG.

  With the above configuration, as in Example 7, in the VA-type transmissive liquid crystal display device using a circularly polarizing plate instead of a normal polarizing plate, γ characteristics when observed from the front and when observed from an oblique direction It is possible to reduce the shift of the γ characteristic. The same effect can be obtained for a transflective liquid crystal display device using a circularly polarizing plate instead of a normal polarizing plate.

  DESCRIPTION OF SYMBOLS 10 ... Liquid crystal cell, 11 ... 1st polarizing plate, 12 ... 2nd polarizing plate, 13 ... 1st phase difference plate, 14 ... 2nd phase difference plate, 15 ... 3rd phase difference plate, 16 ... 4th phase difference plate, 17 ... backlight unit, 18 ... first substrate, 19 ... second substrate, 20 ... liquid crystal layer, 21 ... common electrode, 22 ... pixel electrode, 23 ... color filter, 24 ... first DESCRIPTION OF SYMBOLS 1 alignment film, 25 ... 2nd alignment film, 26 ... Reflector plate, 27 ... Through hole, 28 ... Signal wiring, 29 ... Scanning wiring, 30 ... Thin-film transistor, 31 ... Storage capacity, 32 ... Semiconductor layer, 33 ... Source Electrode 34... First negative C-Plate 35. Second negative C-Plate 36. Orientation control projection 37. Shading portion 38. Electrode slit portion 39. First electrode slit 40 ... second electrode slit, 41 ... comb-like electrode portion, 42 ... mesh Electrode part, 43 ... insulating layer, 44 ... step part, 45 ... wire grit polarizing plate, 46 ... slit.

Claims (14)

  1. A first substrate, a second substrate,
    A liquid crystal layer sandwiched between the first substrate and the second substrate;
    A first polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the first substrate;
    A second polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the second substrate,
    The second substrate has a pixel electrode on the liquid crystal layer side,
    The first substrate has a common electrode on the liquid crystal layer side,
    A liquid crystal display device comprising a plurality of pixels,
    Each pixel of the plurality of pixels has a first subpixel and a second subpixel,
    In one pixel plane, the ratio of the common electrode in the opening of the first subpixel is different from the ratio of the common electrode in the opening of the second subpixel.
    The liquid crystal display device, wherein a ratio of the common electrode to an opening of the first subpixel is 0% or more and 100% or less.
  2. A first substrate, a second substrate,
    A liquid crystal layer sandwiched between the first substrate and the second substrate;
    A first polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the first substrate;
    A second polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the second substrate,
    The second substrate has a pixel electrode on the liquid crystal layer side,
    The first substrate has a common electrode on the liquid crystal layer side,
    A liquid crystal display device comprising a plurality of pixels,
    Each pixel of the plurality of pixels has a first subpixel and a second subpixel,
    In one pixel plane, the ratio of the pixel electrode in the opening of the first subpixel is different from the ratio of the pixel electrode in the opening of the second subpixel,
    The liquid crystal display device, wherein a ratio of the pixel electrode in the opening of the first subpixel is 0% or more and 100% or less.
  3. A first substrate, a second substrate,
    A liquid crystal layer sandwiched between the first substrate and the second substrate;
    A first polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the first substrate;
    A second polarizing plate disposed on a side opposite to the side on which the liquid crystal layer is disposed with respect to the second substrate,
    The second substrate has a pixel electrode on the liquid crystal layer side,
    The first substrate has a common electrode on the liquid crystal layer side,
    A liquid crystal display device comprising a plurality of pixels,
    Each pixel of the plurality of pixels has a first subpixel and a second subpixel,
    The ratio of the common electrode to the opening of the first subpixel is different from the ratio of the common electrode to the opening of the second subpixel in one pixel plane, and the first subpixel The ratio of the common electrode in the opening of is from 0% to 100%,
    In the one-pixel plane, the ratio of the pixel electrode in the opening of the first subpixel is different from the ratio of the pixel electrode in the opening of the second subpixel. The liquid crystal display device, wherein a ratio of the pixel electrode in the opening of the pixel is 0% or more and 100% or less.
  4. The liquid crystal display device according to any one of claims 1 to 3,
    The liquid crystal display device, wherein a major axis of liquid crystal molecules is aligned substantially perpendicular to the first substrate and the second substrate when no voltage is applied to the liquid crystal layer.
  5. The liquid crystal display device according to any one of claims 1 to 3,
    The liquid crystal layer has a major axis of liquid crystal molecules aligned substantially horizontally with respect to the first substrate and the second substrate when no voltage is applied;
    The pretilt angle of the liquid crystal layer is 0 degree or more and less than 10 degrees,
    A liquid crystal display device, wherein a twist angle of liquid crystal molecules between the first substrate and the second substrate is 0 degree or more and less than 90 degrees.
  6. The liquid crystal display device according to any one of claims 1 to 3,
    A liquid crystal display device comprising: a signal line and a scanning line on the second substrate; and a thin film transistor at a location where the signal line and the scanning line intersect.
  7. The liquid crystal display device according to any one of claims 1 to 3,
    A liquid crystal display device in which a color filter is disposed on a side where the liquid crystal layer is disposed with respect to the first substrate.
  8. The liquid crystal display device according to any one of claims 1 to 3,
    One of the first substrate and the second substrate, or both of them are made of a polymer material.
  9. The liquid crystal display device according to any one of claims 1 to 3,
    A liquid crystal display device comprising one or more retardation plates between the first substrate and the first polarizing plate and between the second substrate and the second polarizing plate, respectively.
  10. The liquid crystal display device according to claim 9.
    The phase difference plate is a liquid crystal display device having a phase difference of ¼ wavelength.
  11. The liquid crystal display device according to claim 9.
    The retardation plate has two sheets, a first retardation plate having a phase difference of ¼ wavelength and a second retardation plate having a retardation of ½ wavelength,
    The first retardation plate is disposed between the liquid crystal layer and the second retardation plate,
    The liquid crystal display device, wherein the second retardation plate is disposed between the first polarizing plate or the second polarizing plate and the first retardation plate.
  12. The liquid crystal display device according to claim 9.
    The liquid crystal display device, wherein the retardation plate is a negative C-plate.
  13. The liquid crystal display device according to any one of claims 1 to 3,
    The liquid crystal display device, wherein the pixel electrode and / or the common electrode in the first subpixel is a comb-like electrode.
  14. The liquid crystal display device according to any one of claims 1 to 3,
    The pixel electrode and / or the common electrode in the first subpixel is a comb-like electrode,
    A liquid crystal display device having one or more slits substantially parallel to the longitudinal direction of the comb-like electrodes.
JP2012042255A 2012-02-28 2012-02-28 Liquid crystal display device Pending JP2012108553A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001109009A (en) * 1999-10-01 2001-04-20 Samsung Electronics Co Ltd Wide visual field angle liquid crystal display device
JP2002090764A (en) * 2000-09-12 2002-03-27 Sharp Corp The liquid crystal display device
JP2004198920A (en) * 2002-12-20 2004-07-15 Seiko Epson Corp Liquid crystal display device and electronic equipment
JP2004318077A (en) * 2003-03-18 2004-11-11 Fujitsu Display Technologies Corp Liquid crystal display device and manufacturing method therefor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001109009A (en) * 1999-10-01 2001-04-20 Samsung Electronics Co Ltd Wide visual field angle liquid crystal display device
JP2002090764A (en) * 2000-09-12 2002-03-27 Sharp Corp The liquid crystal display device
JP2004198920A (en) * 2002-12-20 2004-07-15 Seiko Epson Corp Liquid crystal display device and electronic equipment
JP2004318077A (en) * 2003-03-18 2004-11-11 Fujitsu Display Technologies Corp Liquid crystal display device and manufacturing method therefor

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