JP4058768B2 - LCD panel - Google Patents

Description

【００３３】
【表２】

【００３４】
この表１，２に示すように、光学異方性フィルムの遅相軸と配向膜のラビング方向とが平行であり、且つ、光学異方性フィルムのΔｎｄ値が２００ｎｍ以下の場合は、光電子増倍管の出力値が小さく、黒い部分をより黒く表示することができた。特に、表２に示すように、光学異方性フィルムのΔｎｄ値が７０〜１４０ｎｍのときは、コントラストが極めて良好であることが判る。
【００３５】
【発明の効果】
以上説明したように、本発明によれば、一対の光学異方性フィルムを一対の透明基板を挟むように分離して配置したので、高温下で長時間使用しても光学異方性フィルム同士及び光学異方性フィルムと偏向板との接合部で剥離が発生しにくく、接合部に発泡が発生することを抑制できて、耐久性が優れている。また、楕円偏向板の軸角度及びΔｎｄ値の測定が可能であり、抜き取り検査による品質管理が容易であるという利点もある。
【００３６】
更に、各光学異方性フィルムを、それぞれ遅相軸が第１及び第２の透明基板に設けられた配向膜のラビング方向に対し０±１０°以内の角度となるように配置し、リタデーションΔｎｄを５０〜２５０ｎｍとすることにより、視角特性をより一層向上させることができる。
【図面の簡単な説明】
【図１】本発明の実施形態に係る液晶表示パネルを示す平面図である。
【図２】図１のＸ−Ｘ線による断面図である。
【図３】本実施形態の液晶表示パネルの構成を示す模式図である。
【図４】比較例１の液晶表示パネルの構成を示す模式図である。
【図５】比較例２の液晶表示パネルの構成を示す模式図である。
【図６】実施例の液晶表示パネルの等コントラスト曲線を示す図である。
【図７】比較例１の液晶表示パネルの等コントラスト曲線を示す図である。
【図８】比較例２の液晶表示パネルの等コントラスト曲線を示す図である。
【図９】従来の液晶表示パネルを示す平面図である。
【図１０】図９のＹ−Ｙ線による断面図である。
【図１１】透明基板間の液晶の分子を模式的に示す図であり、（ａ）は電極間に電圧を印加していない状態、（ｂ）は電極間に電圧を印加した状態を示す。
【図１２】従来の液晶表示パネルのノーマリブラックモードにおけるＴ−Ｖ（透過率−電圧）特性を示す図である。
【図１３】光学異方性フィルムが設けられた従来の液晶表示パネルの構成を模式的に示す図である。
【図１４】光学異方性フィルムが設けられた従来の液晶表示パネルのＴ−Ｖ特性を示す図である。
【符号の説明】
１，３，３１，３３ 透明基板
２，６，３２，３６ 配向膜
５，３５ 対向電極
７，３７ 液晶
８，１０ 光学異方性フィルム
９，１１，３９，４１ 偏向板
１２，４２ 画素電極
４８ 液晶分子[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display panel provided with an optically anisotropic film (retardation film).
[0002]
[Prior art]
A liquid crystal display panel is advantageous in that it is thin and lightweight, can be driven at a low voltage and consumes less power, and is widely used in various electronic devices. In particular, in recent years, an active matrix type liquid crystal display panel in which an active element such as a TFT (Thin Film Transistor) is provided for each pixel is excellent in display quality in comparison with a CRT (cathode-ray tube). As a result, it is also used in displays such as mobile TVs and personal computers.
[0003]
In general, a liquid crystal display panel has a structure in which a liquid crystal is sandwiched between two transparent substrates. Of the two opposing surfaces (opposing surfaces) of the transparent substrate, a counter electrode and an alignment film are formed on one surface side, and an active matrix circuit, a pixel electrode and an alignment surface are formed on the other surface side. A film or the like is formed. Furthermore, a polarizing plate is affixed to the opposite surface of each transparent substrate. These two polarizing plates are, for example, arranged so that the absorption axes (directions perpendicular to the deflection direction) of the polarizing plates are perpendicular to each other, and according to this, light is transmitted without applying an electric field. In a state in which is applied, a light shielding mode, that is, a normally white mode is set. On the other hand, when the absorption axes of the two deflecting plates are parallel, the normally black mode is set.
[0004]
By the way, an active matrix type liquid crystal display panel has a defect that viewing angle characteristics are generally poorer than that of a CRT, that is, the contrast changes depending on the viewing angle of the screen. In order to improve this, a liquid crystal display panel having an alignment division structure in which one pixel is divided into two regions and the alignment directions of liquid crystal molecules in each region are different from each other has been proposed.
[0005]
FIG. 9 is a plan view showing this type of conventional liquid crystal display panel, and FIG. 10 is a cross-sectional view taken along line YY of FIG.
The glass substrates 31 and 33 are arranged to face each other. A plurality of pixel electrodes 42 are arranged in a matrix on the lower substrate 31, and gate bus lines 43 and data bus lines 44 are formed between the pixel electrodes 42 so as to intersect at right angles. . A TFT 45 is disposed in the vicinity of the intersection of the gate bus line 43 and the data bus line 44. An alignment film 32 is formed on the substrate 31 so as to cover the pixel electrode 42, the gate bus line 43, the TFT 45, and the like.
[0006]
A color filter 34 is formed on the lower surface side of the upper substrate 33. The color filter 34 has one of red (R), blue (B), and green (G) for each pixel. A counter electrode 35 is provided under the color filter 34, and an alignment film 36 is provided under the counter electrode 35.
The alignment films 32 and 36 are made of polyimide, for example, and are subjected to a so-called rubbing process in which the surface is rubbed with a roll to which a cloth such as rayon is attached. The liquid crystal molecules have a property of being aligned along the rubbing direction of the alignment films 32 and 36. In a TN (Twisted Nematic) type liquid crystal display panel, two alignment films 32 and 36 are arranged so that their rubbing directions are substantially orthogonal as seen from above.
[0007]
The substrates 31 and 33 are arranged with a spherical spacer (not shown) for making the distance between them constant, and a liquid crystal 37 is sealed between the substrates 31 and 33. Then, polarizing plates 39 and 41 are disposed on the lower side of the substrate 31 and the upper side of the substrate 33, respectively.
FIGS. 11A and 11B are diagrams schematically showing liquid crystal molecules between the substrates 31 and 33, and FIG. 11A shows a state in which no voltage is applied between the electrodes. ) Indicates a state in which a voltage is applied. In practice, however, the alignment direction of the liquid crystal molecules 48 is twisted by 90 ° on the pixel electrode side and the counter electrode side, but in FIG. 11, the liquid crystal molecules 48 are not twisted for easy understanding. Shown in state.
[0008]
As shown in FIG. 11A, the liquid crystal molecules 48 are aligned according to the rubbing direction of the alignment films 32 and 36 and tilted at a certain angle θ. The angle θ is called a pretilt angle and differs depending on the constituent material of the alignment film. In a TN type liquid crystal display panel in which polarizing plates are arranged orthogonally, the liquid crystal molecules 48 between the two alignment films 32 and 36 change the alignment direction spirally from one transparent substrate 31 toward the other transparent substrate 33. To go. When the voltage between the pixel electrode 42 and the counter electrode 35 is gradually increased, the liquid crystal molecules 48 start to rise in the direction of the electric field with a certain voltage (threshold) as a boundary, and when a sufficient voltage is applied, As shown in FIG. 11B, the liquid crystal molecules 48 are almost perpendicular to the substrates 31 and 33. That is, the liquid crystal molecules 48 change from a state almost parallel to the substrates 31 and 33 to a state almost perpendicular to the substrates 31 and 33 according to the applied voltage, and the transmittance of light transmitted through the liquid crystal display panel also changes accordingly. Therefore, the light transmittance can be controlled for each pixel, and a desired image can be displayed on the liquid crystal display panel.
[0009]
FIG. 12 shows TV (transmittance-voltage) characteristics in the normally black mode of such a liquid crystal display panel.
In FIG. 12, a is the TV characteristic when viewed from the front of the panel, and d is the TV characteristic when the line of sight is tilted 40 ° upward or downward. Further, b is a TV characteristic when looking down from the upper 40 ° direction and c is a TV characteristic when looking up from the lower 40 ° direction in a liquid crystal display panel having no alignment division structure. As shown in FIG. 12, the TV characteristic of d of the liquid crystal display panel having the alignment division structure is a characteristic as if b and c are averaged. That is, the transmittance on the high voltage side is lower than that of c, and the hump-like characteristics as seen in b are not observed. That is, in the liquid crystal display panel having an alignment division structure, the change in optical characteristics when the viewing angle is changed is smaller than that in a normal liquid crystal display panel, and thus the viewing angle characteristics are remarkably improved.
[0010]
Japanese Laid-Open Patent Publication No. 6-118406 proposes that an optically anisotropic film is superimposed on a liquid crystal display panel having an alignment division structure. FIG. 13 is a diagram schematically showing the configuration of this type of liquid crystal display panel. In FIG. 13, reference numeral 50 denotes a liquid crystal panel (corresponding to 31 to 33 in FIG. 10) composed of a pair of substrates on which electrodes and alignment films are formed and liquid crystal sealed between the substrates. As described above, the two optically anisotropic films 46 and 47 are disposed between the liquid crystal panel 50 and the one deflector plate 39 so that the slow axes (in the direction in which the refractive index is high) are orthogonal to each other. As a result, in a normally black mode liquid crystal display panel, it is possible to suppress the portion that should be displayed in black from becoming whitish and improve the contrast.
[0011]
FIG. 14 is a diagram showing TV characteristics of the liquid crystal display panel. In FIG. 14, “a” indicates a TV characteristic when the liquid crystal display panel is viewed from the front, and “c” indicates a TV characteristic when the line of sight is tilted 40 ° upward or downward. Further, b is a TV characteristic when the line of sight is tilted 40 ° upward or downward in a liquid crystal display panel having no optically anisotropic film. From FIG. 14, it can be seen that the transmittance when the voltage is low can be lowered by disposing the optically anisotropic film. That is, in a normally black mode liquid crystal display panel, a black portion can be displayed more black.
[0012]
[Problems to be solved by the invention]
However, in the liquid crystal display panel having the structure shown in FIG. 13, when used for a long time in a high temperature environment, bubbles are likely to be generated at the joint between the optically anisotropic films or between the optically anisotropic film and the deflection plate, There is a drawback that durability is not sufficient. For this reason, this liquid crystal display panel is not sufficiently reliable as a display device used in a relatively high temperature environment such as an aircraft or an automobile.
[0013]
Further, in this liquid crystal display panel, an attempt is made to extract and inspect the retardation (Δnd value: product of refractive index anisotropy Δn and thickness d) of an elliptical deflection plate (a deflection plate to which an optically anisotropic film is bonded). In addition, since the two optically anisotropic films are superposed, the Δnd value cannot be measured. For this reason, there also exists a fault that quality control is difficult.
[0014]
The present invention was created in view of the problems of the above-described conventional example, and has good visual characteristics, and it is difficult to generate bubbles at the joint between the optically anisotropic film and the deflecting plate, so that the reliability is high. Another object of the present invention is to provide a liquid crystal display panel that is high and can measure the axial angle and Δnd value of an elliptical deflection plate.
[0015]
[Means for Solving the Problems]
The above-described problems include the first and second transparent substrates disposed opposite to each other, the liquid crystal sealed between the first and second transparent substrates, and the first and second transparent substrates. A first electrode and a second electrode provided on each opposing surface side of the substrate for controlling the arrangement state of liquid crystal molecules for each pixel, and covering each of the first and second electrodes, and each pixel is divided into two In the first and second regions, the first and second alignment films in which the rising directions of the liquid crystal molecules are opposite to each other, and the first disposed on the opposite side of the facing surface of the first transparent substrate. An optically anisotropic film, a first polarizing plate bonded to the first optically anisotropic film, and a second optical material disposed on the opposite side of the opposing surface of the second transparent substrate. Liquid having an isotropic film and a second polarizing plate bonded to the second optical anisotropic film A display panel, the first and second optically anisotropic film retardation ([Delta] nd value) of 70 to 140 nm, and wherein the rubbing direction of the first alignment film first optically anisotropic The angle formed with the slow axis of the film is set within 0 ± 10 °, and the angle formed between the rubbing direction of the second alignment film and the slow axis of the second optically anisotropic film is 0 ± 10. This is solved by a liquid crystal display panel characterized by being set within the range of ° .
[0016]
The optically anisotropic film is formed by stretching a polymer in a uniaxial direction, and stress is generated in a direction to return to the inside of the optically anisotropic film particularly when left at a high temperature. For this reason, as shown in FIG. 13, when two optically anisotropic films are overlapped and bonded, the stress generated in the two optically anisotropic films is superimposed, and the optically anisotropic films or optical Peeling occurs at the joint between the anisotropic film and the deflecting plate, causing bubbles. Therefore, in the present invention, the two optically anisotropic films are not stacked and bonded, but are disposed so as to sandwich a pair of transparent electrodes. Thereby, even if it uses for a long time under high temperature, it can avoid that a stress is superimposed, and peeling of a junction part and generation | occurrence | production of a bubble can be suppressed. Therefore, the reliability of the liquid crystal display panel is significantly improved. In addition, since the elliptical deflection plate is composed of one deflection plate and one optical anisotropic film, the axial angle and Δnd value of the elliptical deflection plate can be measured, and quality control by sampling inspection is easy. become.
[0017]
In this case, the slow axis of the optically anisotropic film is preferably within 0 ± 10 ° with respect to the rubbing direction of the alignment film provided on the substrate. If the angle formed by the rubbing direction of the alignment film and the slow axis of the optically anisotropic film is out of this range, the viewing angle characteristics are remarkably deteriorated.
The Δnd value of the optically anisotropic film is preferably 50 to 250 nm. That is, an optically anisotropic film having an Δnd value of less than 50 nm is extremely difficult to produce, and when the Δnd value of the optically anisotropic film exceeds 250 nm, the viewing angle characteristics are remarkably deteriorated.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
FIG. 1 is a plan view showing a liquid crystal display panel according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line XX of FIG.
Pixel electrodes (first electrodes) 2 are arranged in a matrix on a transparent substrate (glass substrate) 1, and a gate bus line 13 and a data bus are disposed on the transparent substrate 1 between these pixel electrodes 2. Lines 14 are formed to intersect at right angles. TFTs 15 are formed in the vicinity of the intersections of the gate bus lines 13 and the data bus lines 14, respectively. The gate of the TFT 15 is connected to the gate bus line 13, the drain is connected to the data bus line 14, and the source is connected to the pixel electrode 2. An alignment film 2 is formed on the glass substrate 1 so as to cover the pixel electrode 12, the TFT 15, the gate bus line 13 and the data bus line 14. A region surrounded by the gate bus line 13 and the drain bus line 14 is each pixel region.
[0019]
A transparent substrate (glass substrate) 3 is disposed above the transparent substrate 1. A color filter 4 having any one color of red (R), green (G), and blue (B) is provided for each pixel below the transparent substrate 3. Is provided with a counter electrode (second electrode) 5. A second alignment film 6 is provided below the counter electrode 5.
[0020]
As shown in FIG. 1, each pixel region is divided into two regions I and II, and the rising direction of liquid crystal molecules in region I (indicated by arrow A) is the rising direction of liquid crystal molecules in region II (arrows). (Indicated by B). In order to reverse the rising directions of the liquid crystal molecules in the regions I and II as described above, for example, when the rubbing process is performed on the alignment films 2 and 6, the rubbing direction in the region I and the rubbing direction in the region II are mutually changed. This can be realized by reversing the direction. The alignment films 2 and 6 are arranged so that the rising directions (rubbing directions) of the liquid crystal molecules are orthogonal to each other. A liquid crystal 7 is sealed between the transparent substrates 1 and 3.
[0021]
A first optical anisotropic film 8 is disposed below the transparent substrate 1, and a first deflecting plate 9 is bonded under the first optical anisotropic film 8. . Similarly, a second optical anisotropic film 10 is disposed on the transparent substrate 3, and a second deflecting plate 11 is bonded onto the second optical anisotropic film 10. Yes.
The optically anisotropic films 8 and 10 are formed, for example, by stretching a polymer such as polycarbonate in a uniaxial direction, and have a retardation Δnd value of 50 to 250 nm and a thickness of 60 to 80 μm, for example.
[0022]
FIG. 3 is a schematic diagram showing the configuration of the liquid crystal display panel of the present embodiment. In this figure, a chain line arrow in the liquid crystal panel 20 indicates a rubbing direction of the lower alignment film 2, and a solid line arrow indicates a rubbing direction of the upper alignment film 6. The solid lines in the optically anisotropic films 8 and 10 indicate the direction of the slow axis, and the solid lines in the deflecting plates 9 and 11 indicate the direction of the absorption axis.
In the present embodiment, as shown in FIG. 3, the slow axis direction of the first optical anisotropic film 8 and the rubbing direction of the first alignment film 2 are arranged substantially parallel (0 ± 10 °). Then, the absorption axis of the deflection plate 9 and the rubbing direction of the second alignment film 6 are arranged substantially perpendicularly. Similarly, the direction of the slow axis of the second optical anisotropic film 10 and the rubbing direction of the second alignment film 6 are arranged substantially parallel (0 ± 10 °), and the deflecting plates 9 and 11 These absorption axes are arranged so as to be parallel to each other.
[0023]
In the liquid crystal display panel of the present embodiment configured as described above, light is blocked when no voltage is applied between the electrodes 5 and 12, and when a voltage is applied between the electrodes 5 and 12, the liquid crystal molecules existing between the electrodes Rises along the rubbing direction of the alignment film and transmits light. In this case, in the present embodiment, the viewing angle characteristics are excellent because each pixel has two regions I and II and the alignment directions of the liquid crystal molecules in each region I and II are different. . Further, in the present embodiment, since the color tone is corrected by the optical anisotropic film, the black portion can be displayed more black and a good contrast can be obtained.
[0024]
In this embodiment, since only one optical anisotropic film is bonded to one deflection plate, the optical anisotropic film shrinks even when used for a long time in a high temperature environment. Generation of bubbles due to force can be suppressed. Therefore, the reliability of the liquid crystal display panel of the present embodiment is improved as compared with the conventional case.
Furthermore, since the liquid crystal display panel of this embodiment forms an elliptical deflection plate by bonding one optical anisotropic film to one deflection plate, the elliptical deflection plate (deflection plate and optical anisotropy). It is possible to measure the axial angle and Δnd value of the joined body with the film, and quality control by sampling inspection is easy.
[0025]
Hereinafter, a result of actually manufacturing a liquid crystal display panel according to the present invention and examining its visibility will be described in comparison with a comparative example.
(First embodiment)
As an example, a TFT liquid crystal display panel having the structure shown in FIGS. 1 to 3 was manufactured. The liquid crystal display panel has a size of 10.4 inches (diagonal length), the number of pixels is 640 × 480 dots, and the size of each pixel is 100 × 290 μm. Further, the Δnd value of the optically anisotropic film is 160 nm.
[0026]
As Comparative Example 1, a liquid crystal display panel having the configuration shown in FIG. The liquid crystal display panel of Comparative Example 1 has the same configuration as the example except that it does not have an optically anisotropic film.
As Comparative Example 2, a liquid crystal display panel having the configuration shown in FIG. In the liquid crystal display panel of Comparative Example 2, the two optically anisotropic films 8 and 10 are bonded together and provided only on one side of the liquid crystal panel 20, and the Δnd value of the optically anisotropic film is The configuration is the same as that of the example except that the thickness is 300 nm.
[0027]
The liquid crystal display panels of these examples and comparative examples 1 and 2 were examined for contrast in each line-of-sight direction by changing the line-of-sight direction. 6 is a diagram showing an isocontrast curve (Viewing Cone) of the liquid crystal display panel of the example, FIG. 7 is a diagram showing an isocontrast curve of the liquid crystal display panel of Comparative Example 1, and FIG. It is a figure which shows an isocontrast curve. However, in these FIGS. 6-8, the center point of the figure shows the front of the liquid crystal display panel, and the concentric scale line shows the angle with respect to the normal line of the panel. 6 to 8, the right direction of the liquid crystal display panel is 0.0 deg, the upper direction is 90.0 deg, the left direction is 180.0 deg, and the lower direction is represented by azimuth angles such as 270.0 deg. Furthermore, the thick line in the figure shows an isocontrast curve with a contrast ratio of 30.0, the thin line shows an isocontrast curve with a contrast ratio of 20.0, the broken line shows an isocontrast curve with a contrast ratio of 10.0, and the alternate long and short dash line shows an isocontrast curve with a contrast ratio of 5.0. .
[0028]
As is clear from FIGS. 6 to 8, the liquid crystal display panel (FIG. 7) of Comparative Example 1 has a relatively good viewing angle characteristic in the left-right direction, but a very bad viewing angle characteristic in the vertical direction. It was. Further, the liquid crystal display panel of Comparative Example 2 (FIG. 8) was not satisfactory although the viewing angle characteristics were improved as compared with Comparative Example 1. On the other hand, the liquid crystal display panel of the example (FIG. 6) was very good in viewing angle characteristics in the vertical direction as well as in the horizontal direction, as compared with Comparative Examples 1 and 2.
[0029]
Next, the durability of the liquid crystal display panels of Examples and Comparative Example 2 at high temperatures was examined. As a result, in the liquid crystal display panel of Comparative Example 2, bubbles were observed at the junction between the deflecting plate and the optically anisotropic film when left at 100 ° C. for 24 hours. On the other hand, in the liquid crystal display panel of the example, even if the liquid crystal display panel was allowed to stand at a temperature of 100 ° C. for 1000 hours, no bubbles were observed in the bonded portion of the optical anisotropic film or the deflecting plate.
[0030]
(Second embodiment)
Next, the relationship between retardation and contrast of the optically anisotropic film was examined. That is, optically anisotropic films having a Δnd value of 90 to 570 nm are used, and the slow axis of these optically anisotropic films and the rubbing direction of the alignment film are arranged parallel (see FIG. 3) or perpendicular to each other. A liquid crystal display panel was prepared. Then, when no voltage is applied to the liquid crystal display panels, the output values of the photomultiplier tubes when the viewing angles are tilted by 40 ° in front of these liquid crystal display panels or in the upper, lower, left or right direction, respectively. The contrast was evaluated by examining.
[0031]
Similarly, a liquid crystal display panel having the structure shown in FIG. 3 is manufactured using an optically anisotropic film having a Δnd value of 70 to 140 nm, and these liquid crystal display panels are also arranged in front of or above the liquid crystal display panel. The contrast was examined when the viewing angle was tilted by 40 ° downward, left or right.
These results are shown in Tables 1 and 2 below. However, in Tables 1 and 2, the comparative example is a liquid crystal display panel used as Comparative Example 2 in the first embodiment. In addition, the output values of the photomultiplier tube with the voltage applied to the liquid crystal display panel were almost the same for the same angle.
[0032]
[Table 1]

[0033]
[Table 2]

[0034]
As shown in Tables 1 and 2, when the slow axis of the optically anisotropic film is parallel to the rubbing direction of the alignment film, and the Δnd value of the optically anisotropic film is 200 nm or less, the photoelectron gain is increased. The output value of the double tube was small, and the black part could be displayed in black. In particular, as shown in Table 2, when the Δnd value of the optically anisotropic film is 70 to 140 nm, it can be seen that the contrast is very good.
[0035]
【The invention's effect】
As described above, according to the present invention, since a pair of optically anisotropic films are arranged so as to sandwich a pair of transparent substrates, the optically anisotropic films can be used with each other even if they are used for a long time at a high temperature. Further, peeling is unlikely to occur at the joint between the optically anisotropic film and the deflecting plate, foaming can be prevented from occurring at the joint, and durability is excellent. Further, the axial angle and Δnd value of the elliptical deflection plate can be measured, and there is an advantage that quality control by sampling inspection is easy.
[0036]
Furthermore, each optically anisotropic film is arranged such that the slow axis is at an angle of 0 ± 10 ° or less with respect to the rubbing direction of the alignment film provided on the first and second transparent substrates, and retardation Δnd. By setting the thickness to 50 to 250 nm, the viewing angle characteristics can be further improved.
[Brief description of the drawings]
FIG. 1 is a plan view showing a liquid crystal display panel according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along line XX of FIG.
FIG. 3 is a schematic diagram showing a configuration of a liquid crystal display panel of the present embodiment.
4 is a schematic diagram showing a configuration of a liquid crystal display panel of Comparative Example 1. FIG.
5 is a schematic view showing a configuration of a liquid crystal display panel of Comparative Example 2. FIG.
FIG. 6 is a diagram showing isocontrast curves of a liquid crystal display panel of an example.
7 is a diagram showing isocontrast curves of the liquid crystal display panel of Comparative Example 1. FIG.
8 is a diagram showing isocontrast curves of a liquid crystal display panel of Comparative Example 2. FIG.
FIG. 9 is a plan view showing a conventional liquid crystal display panel.
10 is a cross-sectional view taken along line YY in FIG.
11A and 11B are diagrams schematically showing liquid crystal molecules between transparent substrates, in which FIG. 11A shows a state where no voltage is applied between the electrodes, and FIG. 11B shows a state where a voltage is applied between the electrodes.
FIG. 12 is a diagram showing TV (transmission-voltage) characteristics in a normally black mode of a conventional liquid crystal display panel.
FIG. 13 is a diagram schematically showing a configuration of a conventional liquid crystal display panel provided with an optically anisotropic film.
FIG. 14 is a diagram showing TV characteristics of a conventional liquid crystal display panel provided with an optically anisotropic film.
[Explanation of symbols]
1, 3, 31, 33 Transparent substrate 2, 6, 32, 36 Alignment film 5, 35 Counter electrode 7, 37 Liquid crystal 8, 10 Optical anisotropic film 9, 11, 39, 41 Deflection plate 12, 42 Pixel electrode 48 Liquid crystal molecules

Claims (2)

First and second transparent substrates disposed opposite to each other;
A liquid crystal sealed between the first and second transparent substrates;
First and second electrodes which are provided on the opposing surface sides of the first and second transparent substrates and which control the alignment state of liquid crystal molecules for each pixel;
First and second alignment films that cover these first and second electrodes, respectively, and in which the rising directions of the liquid crystal molecules are opposite to each other in the first and second regions that divide one pixel into two, ,
A first optically anisotropic film disposed on the opposite side of the opposing surface of the first transparent substrate;
A first polarizing plate bonded to the first optical anisotropic film;
A second optically anisotropic film disposed on the opposite side of the opposing surface of the second transparent substrate;
A liquid crystal display panel having a second polarizing plate bonded to the second optically anisotropic film,
The retardation (Δnd value) of the first and second optically anisotropic films is 70 to 140 nm , and
An angle formed between the rubbing direction of the first alignment film and the slow axis of the first optical anisotropic film is set within 0 ± 10 °, and the rubbing direction of the second alignment film and the second An angle formed with the slow axis of the optically anisotropic film is set within 0 ± 10 ° . 2. The liquid crystal display panel according to claim 1, wherein absorption axes of the first and second polarizing plates are arranged in parallel to each other.

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