JP2002023167A - Thin film transistor(tft) liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high quality TFT liquid crystal display panel realizing a picture display with high contrast and a wide viewing angle and further exhibiting extremely little color slippage or the like influenced by the viewing angle. SOLUTION: In the TFT liquid crystal display panel containing a TFT substrate having TFT array groups, a counter electrode substrate on which a transparent electrode layer is formed, a twisted nematic liquid crystal layer held between the TFT substrate and the counter electrode substrate and a pair of polarizing plates respectively arranged outside the TFT substrate and the counter electrode substrate with respective absorption axes intersecting with each other, the components are arranged in such a way that an intersection angle of rubbing axes corresponding to a liquid crystal twist angle of the twisted nematic liquid crystal layer is larger than an intersection angle of absorption axes of the pair of the polarizing plates and an angle between the rubbing axis of the TFT substrate and the absorption axis of the polarizing plate on the TFT substrate and an angle between the rubbing axis of the counter electrode substrate and the absorption axis of the polarizing plate on the counter electrode substrate are equal to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin film transistor (hereinafter referred to as a thin film transistor).
It is called "TFT". The present invention relates to a TFT type liquid crystal display panel using the above method.

[0002]

2. Description of the Related Art With the rapid market growth and demand expansion of TFT type liquid crystal displays in recent years, small and medium-sized video display fields such as portable televisions and car navigation systems, still picture display fields such as personal computers and monitors, and the like. 2. Description of the Related Art In the field of large-sized moving image display represented by a hybrid television, etc., a high-definition liquid crystal display having vivid color expression has been eagerly sought with a product concept of "light, thin, continuous and saving".

At the same time, there is a strong demand for display quality improvement and quality stability including reliability.
In particular, liquid crystal displays are compared and discussed in comparison with CRT displays that have been widely used in the past, and there are many approaches to improving or overcoming viewing angle dependence, which is a characteristic characteristic of displays using liquid crystals. It has been done.

Here, a panel structure of a conventional TFT type liquid crystal display panel will be described with reference to FIGS. 11 and 12. FIG. FIG. 11 is a sectional view of a panel configuration in a conventional TFT type liquid crystal display panel. In FIG. 11, array chips 2a and 2b and an alignment film 3a are formed on a glass substrate 1, and a TFT substrate 4 is manufactured. Further, on a glass substrate 5, a black matrix 6a and 6b, a colored layer 7, a counter electrode 8, and an alignment film 3b are sequentially formed to form a counter electrode substrate 9.

After rubbing the TFT substrate 4 and the counter electrode substrate 9 in a predetermined direction, spacers 10 are scattered on the counter electrode substrate 9 to form a uniform cell gap. Then, the TFT substrate 4 and the counter electrode substrate 9 are bonded to each other with a sealing resin 11 and cut into a predetermined size.
By injecting the liquid crystal 12 into the gap between the FT substrate 4 and the counter electrode substrate 9, a liquid crystal cell is manufactured. On both sides of the liquid crystal cell, liquid crystal optical compensation films 13a and 13b and polarizing plates 14a and 14b are sequentially installed in a predetermined sticking direction.

FIG. 12A is a perspective view showing the configuration of a conventional liquid crystal display panel in order from the counter electrode substrate 9 side, and FIG. FIG. 4 is a plan view when viewed from the substrate 9 side. Here, 15a is the rubbing axis direction of the liquid crystal 12 on the TFT substrate side, and 15b is the liquid crystal 12 direction on the counter electrode substrate side.
Of the rubbing axis is shown. Also, 16a and 16b indicate the optical axis directions of the optical compensation film, and 17a and 17b indicate the directions of the absorption axes of the polarizing plates. The axis directions of the upper and lower substrates are 15a, 16a, and 17a.
, And 15b, 16b, and 17b are arranged to have the same orientation.

[0007]

FIG. 13 shows the viewing angle-contrast ratio characteristics of a conventional liquid crystal display panel.
Shown in In FIG. 13, the horizontal axis indicates the vertical viewing angle. From FIG. 13, in the conventional liquid crystal display panel, the contrast ratio tends to be relatively large toward the center of the liquid crystal display panel, but the high contrast region where a good display image is obtained is concentrated downward from the front of the panel. It is clear that they are distributed statistically. In addition, since the contrast ratio sharply changes depending on the viewing angle in the vertical viewing angle direction, the larger the display size, the larger the viewing angle in the vertical direction of the panel. Is more remarkable, and it is not always possible to provide a display image having excellent visibility.

As a means for increasing the viewing angle, a method of expanding the entire viewing angle-contrast characteristic by attaching an optical compensation film to a liquid crystal display panel is most often used. There is also a new problem that coloring occurs due to mismatch of the phase difference between the liquid crystal layer and the optical compensation film in the display area.

At present, this problem is addressed by designing the liquid crystal layer of the liquid crystal cell to have a small retardation value. However, as a side effect of adopting such a method, the panel transmittance is reduced to 20%. The above loss results in hindering the increase in brightness of a liquid crystal display using such a method.

It is an object of the present invention to provide a thin film transistor type liquid crystal display panel which can maintain high visibility by improving such a contrast viewing angle dependency and a decrease in panel transmittance.

[0011]

In order to achieve the above object, a thin film transistor type liquid crystal display panel according to the present invention comprises a thin film transistor substrate having a group of thin film transistors, a counter electrode substrate on which a transparent electrode layer is formed, and a thin film transistor substrate. A thin film transistor type liquid crystal display panel comprising: a twisted nematic liquid crystal layer sandwiched between a thin film transistor substrate and a counter electrode substrate; and a pair of polarizing plates disposed so that absorption axes intersect outside the thin film transistor substrate and the counter electrode substrate. The crossing angle of the rubbing axis corresponding to the liquid crystal twist angle of the twisted nematic liquid crystal layer is larger than the crossing angle of the absorption axes of the pair of polarizing plates, and the crossing angle between the rubbing axis of the thin film transistor substrate and the absorption axis of the polarizing plate on the thin film transistor substrate. 1 angle, rubbing axis of counter electrode substrate and counter electrode The second angle formed between the absorption axis of the polarizing plate on the plate, characterized in that equal.

With this configuration, it is possible to move the high contrast area of the display toward the front of the screen, and it is possible to realize good image display.

Further, the thin film transistor type liquid crystal display panel according to the present invention is provided with a hybrid between at least one of between a thin film transistor substrate and a polarizing plate on the thin film transistor substrate, or between a counter electrode substrate and a polarizing plate on the counter electrode substrate. The liquid crystal optical compensation film further includes a negative uniaxial liquid crystal optical compensation film having an alignment form, and a third angle between a statistical arrangement direction of liquid crystal molecules on the liquid crystal optical compensation film and a plane of the liquid crystal optical compensation film is set such that the thin film transistor It is preferable to change continuously to the polarizing plate side on the substrate or from the counter electrode substrate side to the polarizing plate side on the counter electrode substrate. This is because it is possible to realize a further higher contrast and a wider viewing angle display of the entire liquid crystal display panel.

In the thin film transistor type liquid crystal display panel according to the present invention, the crossing angle of the rubbing axis is 94 ° or more.
It is preferable that the angle is 6 ° or less. Crossing angle θ of rubbing axis
Is about 95 ° because the visibility is highest.

In the thin film transistor type liquid crystal display panel according to the present invention, the angle between the liquid crystal alignment direction of the liquid crystal optical compensation film and the rubbing direction of the twisted nematic liquid crystal layer is not less than -3 ° and not more than 3 °, and the wavelength is not more than 3 °. 550n
When m, the front retardation of the liquid crystal optical compensation film is preferably 20 nm or less. By designing the liquid crystal cell in the low retardation direction, that is, by designing the crossing angle of the rubbing axis to be smaller, it is possible to suppress color shift in the viewing angle and coloring of achromatic display, etc. This is because an image can be realized.

In the thin film transistor type liquid crystal display panel according to the present invention, it is preferable that the liquid crystal application voltage at the time of lighting black is 5 V or more and 7 V or less. This is because the higher the liquid crystal applied voltage is, the higher the contrast value can be obtained. However, when the applied voltage exceeds 7 V, a decrease in luminance cannot be ignored.

Further, in the thin film transistor type liquid crystal display panel according to the present invention, it is preferable that the maximum transmittance determined by the front retardation of the twisted nematic liquid crystal layer can be adjusted by the crossing angle of the rubbing axis. This is because no matter how the retardation value of the liquid crystal cell is designed, a bright image display can be realized without impairing the transmittance of the liquid crystal display panel.

In the thin film transistor type liquid crystal display panel according to the present invention, when the wavelength λ is 550 nm, the front retardation of the twisted nematic liquid crystal layer is 180 n.
It is preferable to adjust within the range of m to 380 nm.

Further, in the thin film transistor type liquid crystal display panel according to the present invention, the liquid crystal refractive index anisotropy of the twisted nematic liquid crystal layer when the wavelength is λ (nm) is reduced.
As n (λ), in the visible light range where the wavelength λ is 380 nm or more and 780 nm or less, Δn (λ) / Δn (5
It is preferable to use a positive uniaxial liquid crystal in which 50) is 0.95 or more and 1.05 or less. This is because high contrast characteristics, wide viewing angle characteristics, and the like can be ensured.

Further, the thin film transistor type liquid crystal display panel according to the present invention is arranged such that the angle between the liquid crystal alignment direction of the liquid crystal optical compensation film and the rubbing direction of the twisted nematic liquid crystal layer is not less than -3 ° and not more than 3 °. And the liquid crystal optical compensation film has a front retardation of 20 nm.
The following is preferred. This is because higher contrast characteristics, wider viewing angle characteristics, and the like can be ensured.

[0021]

Embodiment 1 Hereinafter, a TFT type liquid crystal display panel according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1A is a perspective view showing the TFT type liquid crystal display panel according to the first embodiment of the present invention in order from the counter electrode substrate 9 side.
FIG. 2B is a plan view of the TFT liquid crystal display panel according to the first embodiment of the present invention when viewed from the counter electrode substrate 9 side. Here, 15a indicates the rubbing axis direction of the liquid crystal 12 on the TFT substrate side, and 15b indicates the rubbing axis direction of the liquid crystal 12 on the counter electrode substrate side. 17a and 17b indicate the directions of the absorption axis in the polarizing plate. The TF according to the first embodiment
The cross-sectional view of the T-type liquid crystal display panel has the same configuration as the conventional liquid crystal display panel.

As shown in FIG. 1, when the crossing angle of the rubbing axis is designed to be larger than the crossing angle of the absorption axis in the polarizing plate,
As shown in FIG. 2, the maximum contrast peak in the vertical direction can be adjusted. That is, the parameter angle in FIG. 2 indicates the intersection angle θ of the rubbing axis,
The maximum contrast peak in the vertical direction can be adjusted by shifting the crossing angle θ of the rubbing axis in the vertical direction. This utilizes the optical rotation dispersion or birefringence of a twisted nematic liquid crystal cell under a black and white voltage applied to a liquid crystal panel. Therefore, by changing the crossing angle of the rubbing axis, it is possible to adjust so that the maximum contrast ratio peak comes to the frontal azimuth of the target.

For example, when the crossing angle θ of the rubbing axis is designed at 95 °, the obtained TFT type liquid crystal display panel can obtain the maximum contrast ratio in the front direction in the vertical viewing angle direction, and the conventional liquid crystal display panel shown in FIG. Excellent display quality can be obtained as compared with the TFT type liquid crystal display panel. Here, if the crossing angle θ of the rubbing axis is in the range of 94 ° ≦ θ ≦ 96 °, almost the same characteristics can be obtained.

(Embodiment 2) Hereinafter, a TFT type liquid crystal display panel according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 3A is a perspective view showing a TFT type liquid crystal display panel according to a second embodiment of the present invention in order from the counter electrode substrate 9 side, and FIG. 3B is a second embodiment of the present invention. FIG. 2 is a plan view of the TFT type liquid crystal display panel according to FIG.
In addition to FIG. 1, a negative uniaxial liquid crystal optical compensation film 13a fixed in a hybrid orientation mode between a TFT substrate and a polarizing plate on the same substrate or a counter electrode substrate and a polarizing plate on the same substrate; 13b, the angle between the orientation direction of the hybrid liquid crystal and the rubbing direction of the liquid crystal layer on the liquid crystal cell side is also shown. 15a indicates the rubbing axis direction of the liquid crystal 12 on the TFT substrate side, and 15b indicates the rubbing axis direction of the liquid crystal 12 on the counter electrode substrate side. Reference numerals 17a and 17b denote the absorption axis directions of the polarizing plate.

By using the liquid crystal optical compensation films 13a and 13b as shown in FIG. 3, a higher contrast ratio can be obtained in the vertical viewing angle as shown in FIG. 4 than in FIG. This is because, when a black voltage is applied to the liquid crystal panel, the liquid crystal molecules rise in the direction of the electric field, but the liquid crystal optical compensation film compensates for the residual retardation near the glass substrate interface in both the upper and lower directions. This is because white floating of black display in the angular direction is suppressed, and the contrast ratio can be improved. FIG.
2, the angle parameters indicated by ○, □, Δ, etc. indicate the crossing angle θ of the rubbing axis.

Here, the angle θ ′ between the liquid crystal optical axis direction of the liquid crystal optical compensation film and the rubbing direction of the liquid crystal layer on the liquid crystal cell side is arranged to be 0 °. Further, the wavelength λ = 5
The retardation Re '(550) in the front direction of the liquid crystal optical compensation film at 50 nm is set to 20 nm.
However, the black and white effective voltage of the liquid crystal is about 5V. The angle θ ′ between the liquid crystal optical axis direction of the liquid crystal optical compensation film and the rubbing direction of the liquid crystal layer on the liquid crystal cell side is −3 ° ≦ θ ′ ≦ 3.
Even in the range of ゜, almost the same characteristics can be obtained,
The retardation Re ′ (550) in the front direction of the liquid crystal optical compensation film at a wavelength λ = 550 nm is 20 n.
When the value is not more than m, better characteristics can be obtained.

On the other hand, a high contrast value can be obtained by setting the applied voltage of Vlc (black) high, but on the other hand, the luminance decreases. Assuming compatibility of such conflicting phenomena, good display characteristics can be realized by driving and displaying the Vlc (black) voltage at 5 V ≦ Vlc ≦ 7 V. This is because by compensating the phase of the liquid crystal cell and the liquid crystal optical compensation film at 5V ≦ Vlc ≦ 7V, it is possible to obtain almost the same high-contrast viewing angle characteristics.

Further, as shown in FIG. 5, the use of this design method makes it possible to concentrate the high-contrast characteristic region more in the vicinity of the center of the screen, thereby effectively suppressing a sharp decrease in contrast due to the viewing angle as compared with the related art. As a result, a good display image can be realized. Here, CR in FIG. 5 indicates a contrast ratio. For example, CR
> 5 indicates that the contrast ratio is greater than 5. When compared with the same characteristics of the conventional TFT type liquid crystal display panel of FIG. 14, each CR range is widened in view angle, and the steepness of the contrast ratio characteristics in the upper and lower view angle directions is reduced. I understand.

For example, the angle θ ′ between the liquid crystal optical axis direction of the liquid crystal optical compensation film and the rubbing direction of the liquid crystal layer on the liquid crystal cell side is arranged so that −3 ° ≦ θ ′ ≦ 3 °, and λ =
The retardation Re '(550) in the front direction of the liquid crystal optical compensation film at 550 nm was adjusted to be 20 nm or less. On the other hand, when the Vlc (black) voltage applied to the liquid crystal at the time of black display is driven and displayed at 5 V ≦ Vlc ≦ 7 V, the obtained TFT type liquid crystal display panel becomes almost in the front direction in the vertical viewing angle direction. A maximum contrast ratio can be obtained, and a wide contrast characteristic can be obtained over the entire viewing angle.

Embodiment 3 Hereinafter, a TFT type liquid crystal display panel according to Embodiment 3 of the present invention will be described with reference to the drawings. FIG. 6 is a characteristic diagram showing the transmittance at the front retardation Re of the liquid crystal layer in the TFT display liquid crystal panel according to the third embodiment, using the rubbing intersection angle θ as a parameter.

Conventional 90 ° twisted nematic (TN)
In the configuration of the liquid crystal panel, regardless of the presence or absence of the liquid crystal optical compensation film, the panel transmittance decreases due to the decrease in the front retardation of the liquid crystal layer, and particularly in the case where the liquid crystal optical compensation film is used, in the left and right viewing angle directions. The occurrence of coloring (yellowing) and color shift and its countermeasures have made it necessary to design the panel so that the front retardation of the liquid crystal layer is as small as possible. As a side effect, a significant reduction in panel transmittance has been a major issue.

Therefore, by controlling the twist angle of the liquid crystal layer so as to obtain the maximum transmittance in accordance with the front retardation of the liquid crystal layer, a high-luminance display with a brightness equal to or higher than that of the related art without sacrificing the transmittance. Images can be realized. This utilizes the optical rotation dispersion and birefringence of a twisted nematic liquid crystal cell.

FIG. 7 shows the amount of color shift and its range in the achromatic display of a typical low twist type liquid crystal display panel which can obtain the maximum transmittance in the configuration with the liquid crystal optical compensation film (u ', v'). Chromaticity diagram (based on CIE 1976). Here, the results are shown in the case where the viewing azimuth angle φ is set to 0 ° ≦ φ ≦ 360 ° at 10 ° intervals, and the expected viewing angle φ ′ is changed to 0 ° ≦ φ ′ ≦ 80 ° at 1 ° intervals. .

FIG. 8 shows a color shift amount and its range in an achromatic display in a conventional 90 ° twist type liquid crystal panel configuration by a (u ′, v ′) chromaticity diagram (based on CIE 1976). . As is clear from the comparison between FIG. 7 and FIG. 8, the low twist type liquid crystal panel configuration has much smaller color shift variation and realizes high quality image display without coloring compared to the conventional configuration. Is possible.

FIG. 9 shows the viewing angle-transmittance characteristics of the upper and lower viewing angles in 8-gradation display in a low twist type liquid crystal panel configuration. Here, eight gradation levels are selected by dividing the transmittance corresponding to each of the white voltage and the black voltage into seven in the voltage-transmittance characteristics in the front direction, and then using eight voltages corresponding to each. It is.

Similarly, FIG. 10 shows the viewing angle-transmittance characteristics of the upper and lower viewing angles in the 8-gradation display in the case of the conventional configuration. FIG.
10 and FIG. 10, when comparing the grayscale inversion angle, which is the angle at which the transmittance of the black voltage and another brighter voltage level is inverted at the lower viewing angle, the latter is inverted in a viewing field narrower in viewing angle than the former. And good gradation characteristics in a low twist type liquid crystal panel configuration can be obtained.

Here, the front retardation Re of the liquid crystal layer is obtained.
(550) is more preferably in the range from 180 nm to 380 nm. When the liquid crystal cell refractive index anisotropy at the wavelength λ is defined as Δn (λ), 0.95 ≦ Δn (λ) / within the visible light range where the wavelength λ is 380 nm or more and 780 nm or less. Δn (550) ≦ 1.05
If a positive uniaxial liquid crystal that satisfies is satisfied, even better characteristics can be obtained. In the case of the panel structure with the liquid crystal optical compensation film, the angle θ ′ between the liquid crystal optical axis direction of the liquid crystal optical compensation film and the rubbing direction of the liquid crystal layer on the liquid crystal cell side is −3 ° ≦ θ ′ ≦ 3 °. To place. By setting within these ranges, substantially the same characteristics can be obtained.

Further, the retardation Re 'in the front direction of the liquid crystal optical compensation film at the wavelength λ = 550 nm.
By adjusting (550) to be equal to or less than 20 nm, it is possible to obtain higher contrast characteristics, wider viewing angle characteristics, and gradation inversion angles.

In FIG. 6, the twist angle θ was adjusted to 45 ° in the configuration of the TFT display liquid crystal panel. The liquid crystal layer was manufactured so that the front retardation Re (550) thereof was in the range of 180 nm to 380 nm. When the wavelength λ is 38
0.95 ≦ Δn (λ) / Δn (550) ≦ 1.05 in a visible light range of 0 nm or more and 780 nm or less.
A positive uniaxial liquid crystal satisfying the following condition was used. The angle θ ′ formed between the liquid crystal optical axis direction of the liquid crystal optical compensation film and the rubbing direction of the liquid crystal layer on the liquid crystal cell side was arranged to be −3 ° or more and 3 ° or less.

Also, the retardation Re 'in the front direction of the liquid crystal optical compensation film at the wavelength λ = 550 nm is shown.
(550) was adjusted to be 20 nm or less.

With this configuration, it is possible to further improve the contrast characteristic, the wide viewing angle characteristic, and the gradation inversion angle. Also, the retardation R in the front direction of the liquid crystal optical compensation film at λ = 550 nm
e ′ (550) was adjusted to be 20 nm or less.

The obtained TFT type liquid crystal display panel can obtain the maximum transmittance at the relative transmittance determined from the retardation and the twist angle of the liquid crystal layer, has very little color shift in all directions of the viewing angle, A high-contrast area can be designed substantially in the frontal direction in the viewing angle direction, a wide contrast ratio can be provided over the entire viewing angle, and a high-display-quality image in which the grayscale inversion area spreads can be provided.

[0043]

As described above, according to the TFT type liquid crystal display panel of the present invention, the maximum contrast ratio and the high contrast region can be concentrated substantially in the front direction in the vertical viewing angle direction, and the excellent high display quality can be obtained. Can be provided.

According to the TFT type liquid crystal display panel of the present invention, a high-luminance display image is provided, an achromatic display is provided in all directions of the viewing angle, the coloring is very small, and the liquid crystal display panel is almost in front of the vertical viewing angle. A high-contrast ratio can be obtained, and a high-quality image that can reduce the grayscale inversion region over the entire viewing angle can be provided.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a thin film transistor type liquid crystal display panel according to a first embodiment of the present invention;

FIG. 2 is a vertical viewing angle-contrast characteristic diagram at a rubbing intersection angle in the thin film transistor type liquid crystal display panel according to the first embodiment of the present invention;

FIG. 3 is an explanatory diagram of a thin film transistor type liquid crystal display panel according to a second embodiment of the present invention;

FIG. 4 is a vertical viewing angle-contrast characteristic diagram at a rubbing intersection angle in a thin film transistor type liquid crystal display panel according to a second embodiment of the present invention;

FIG. 5 is a view angle characteristic diagram of a thin film transistor type liquid crystal display panel according to a second embodiment of the present invention;

FIG. 6 is a characteristic diagram of retardation and rubbing intersection angle in a thin film transistor type liquid crystal display panel according to a third embodiment of the present invention;

FIG. 7 is a chromaticity diagram of the thin-film transistor liquid crystal display panel according to the third embodiment of the present invention;

FIG. 8 is a chromaticity diagram of a conventional thin film transistor type liquid crystal display panel.

FIG. 9 is a view angle-transmittance characteristic diagram of a thin-film transistor liquid crystal display panel according to a third embodiment of the present invention.

FIG. 10 is a viewing angle-transmittance characteristic diagram of a conventional thin film transistor type liquid crystal display panel.

FIG. 11 is a sectional view of a conventional thin film transistor type liquid crystal display panel.

FIG. 12 is an explanatory view of a conventional thin film transistor type liquid crystal display panel.

FIG. 13 is a view showing viewing angle-contrast ratio characteristics in a conventional thin film transistor type liquid crystal display panel.

FIG. 14 is a view angle characteristic diagram of a conventional thin film transistor type liquid crystal display panel.

[Explanation of symbols]

 Reference Signs List 1, 5 glass substrate 2 array chip 3 polyimide alignment film (effective display pixel area) 4 TFT substrate (thin film transistor substrate) 6 black matrix layer 7 coloring layer 8 counter electrode 9 counter electrode substrate 10 spacer 11 seal resin 12 liquid crystal 13 liquid crystal optics Compensation film 14 Polarizing plate 15 Rubbing axis direction of liquid crystal 16 Optical axis direction of liquid crystal optical compensation film 17 Absorption axis direction of polarizing plate 18 Fiber resin 19 Acrylic resin 20 Pixel electrode

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Shigeki Matsuoka 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (reference) 2H090 HC18 HC20 KA05 LA02 LA04 LA06 LA09 MA04 MA06 MB02 MB03 2H091 FA11Y FD07 FD10 FD12 GA13 HA07 KA02 LA11 LA19 2H092 JA24 PA10 PA11 QA07

Claims (9)

[Claims] A thin film transistor substrate having a thin film transistor array group; a counter electrode substrate on which a transparent electrode layer is formed; a twisted nematic liquid crystal layer sandwiched between the thin film transistor substrate and the counter electrode substrate; A thin film transistor type liquid crystal display panel including a pair of polarizing plates arranged so that absorption axes cross each other outside the counter electrode substrate, wherein a crossing angle of a rubbing axis corresponding to a liquid crystal twist angle of the twisted nematic liquid crystal layer. Is larger than the crossing angle of the absorption axes of the pair of polarizing plates, a first angle between the rubbing axis of the thin film transistor substrate and the absorption axis of the polarizing plate on the thin film transistor substrate, the rubbing axis of the counter electrode substrate, and Second angle between the absorption axis of the polarizing plate on the counter electrode substrate Thin film transistor liquid crystal display panel, wherein the equivalent. 2. A uniaxial negative axis having a hybrid orientation mode at least between the thin film transistor substrate and the polarizing plate on the thin film transistor substrate or between the counter electrode substrate and the polarizing plate on the counter electrode substrate. A liquid crystal optical compensation film, wherein a third angle between a statistical alignment direction of liquid crystal molecules on the liquid crystal optical compensation film and the plane of the liquid crystal optical compensation film is different from the thin film transistor substrate side to the thin film transistor substrate. 2. The thin film transistor type liquid crystal display panel according to claim 1, wherein the liquid crystal display panel continuously changes to a polarizing plate side or from the counter electrode substrate side to a polarizing plate side on the counter electrode substrate. 3. The rubbing axis has an intersection angle of 94 ° or more and 9 or more.
3. The thin film transistor type liquid crystal display panel according to claim 1, wherein the angle is 6 [deg.] Or less. 4. An angle between a liquid crystal alignment direction of the liquid crystal optical compensation film and a rubbing direction of the twisted nematic liquid crystal layer is not less than -3 ° and not more than 3 °, and the wavelength is 55 °.
4. The thin film transistor type liquid crystal display panel according to claim 2, wherein when the thickness is 0 nm, the front retardation of the liquid crystal optical compensation film is 20 nm or less. 5. A liquid crystal application voltage at black lighting of 5 V or more and 7 V or more.
The thin film transistor type liquid crystal display panel according to claim 3 or 4, wherein: 6. The thin film transistor type liquid crystal display panel according to claim 1, wherein a maximum transmittance determined by a front retardation of the twisted nematic liquid crystal layer can be adjusted by an intersection angle of the rubbing axis. 7. When the wavelength λ is 550 nm, the twisted nematic liquid crystal layer has a front retardation of 180 n.
7. The thin film transistor type liquid crystal display panel according to claim 6, wherein the adjustment is performed within a range from m to 380 nm. 8. The liquid crystal refractive index anisotropy of the twisted nematic liquid crystal layer when the wavelength is λ (nm) is Δn.
(Λ) in the visible light range where the wavelength λ is 380 nm or more and 780 nm or less, Δn (λ) / Δn (55
8. The thin film transistor type liquid crystal display panel according to claim 6, wherein a positive uniaxial liquid crystal in which 0) is 0.95 or more and 1.05 or less is used. 9. The liquid crystal optical compensation film is disposed so that an angle between a liquid crystal alignment direction of the liquid crystal optical compensation film and a rubbing direction of the twisted nematic liquid crystal layer is not less than -3 ° and not more than 3 °, and front retardation of the liquid crystal optical compensation film is provided. Is 20
The thin film transistor type liquid crystal display panel according to any one of claims 6 to 8, wherein the thickness is not more than nm.