JP2002148620A - Thin film transistor type liquid crystal display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thin film transistor(TFT) type liquid crystal display panel suppressing gray scale reversal in a gradation display and realizing a wide viewing angle and high contrast. SOLUTION: A nematic liquid crystal layer 12 in twist alignment is held between a TFT substrate 4 having a TFT array group and a counter electrode substrate 10 having a transparent electrode film formed thereon and polarizing plates 19a, 19b in crossed Nicols are arranged in rubbing directions of both substrates. Two layers of uniaxial or biaxial optical retardation films 22a, 22b are arranged on the counter electrode substrate. The optical retardation film 22a on the side close to the counter electrode substrate is arranged so as to make the optic axis direction be identical to the rubbing direction of the counter electrode substrate side and further be perpendicular to the optic axis direction of the other optical retardation film 22b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a TFT type liquid crystal display panel using a thin film transistor (hereinafter abbreviated as TFT) and an image display application device using the same.

[0002]

2. Description of the Related Art A panel structure of a conventional TFT type liquid crystal display panel will be described with reference to FIGS. FIG.
Shows a cross-sectional view of a conventional panel configuration. The array chips 2a and 2b, the pixel electrodes 18, the alignment film 3 and the like are formed on the glass substrate 1, and the TFT substrate 4 is manufactured. The counter electrode substrate 10 is manufactured by forming the black matrices 6 a and 6 b, the coloring layer 7, the overcoat layer 13, the counter electrode 8, and the alignment film 9 on the glass substrate 5. Both substrates 4,1
After rubbing 0, spacers 14 are uniformly dispersed on the counter electrode substrate 10 to form a cell gap.
After the alignment of the TFT substrate 4 and the counter electrode substrate 10 with the sealing resin 11 is hardened, the TFT substrate 4 is cut into a predetermined size.
Is injected to produce a liquid crystal panel. Reference numeral 15 denotes a conductive resin. Polarizing plates 19a and 19b are attached to the outer surfaces of the glass substrates 1 and 5, respectively.

FIGS. 15A and 15B are perspective views showing the optical arrangement of each element in the above-described panel configuration, wherein FIG. 15A shows each element, and FIG. 20a and 20b represent rubbing axis directions of the TFT substrate 4 and the counter electrode substrate 10, respectively. Its axis intersection angle is set to 90 °. 21a and 21b are polarizing plates 19a (TFTs, respectively).
The absorption axis directions of the substrate 4) and 19b (the counter electrode substrate 10) are shown. Here, 20a and 21a and 20b and 21b are respectively arranged in the same direction.

[0004]

In recent years, liquid crystal displays are realizing excellent display performance (brightness, color reproduction, response speed) comparable to CRTs by developing new materials and improving process manufacturing techniques. Also, with the remarkable market growth of the small AV, PC and large monitor fields, the demand for increasingly high-definition and high-quality “ultra” display performance display and multi-functional display, such as characters that are supposed in the future digital society, There is a demand for display performance as a multimedia display supporting moving images. In particular, the liquid crystal display is C
Since the comparison is performed with the target of RT, improvement of the viewing angle display characteristics has been strongly demanded.

FIG. 16 shows a voltage-transmittance characteristic when a conventional liquid crystal panel is viewed from a vertical viewing angle direction. In the front direction, good transmittance-gradation characteristics are obtained, and a clear image display can be realized. On the other hand, when viewed from the lower viewing direction, as the expected angle increases, a rebound phenomenon (gradation inversion) of the transmittance occurs in the halftone area, so that the image is negative-positive inverted, making recognition difficult.

FIG. 17 shows a vertical viewing angle-transmittance characteristic in the case of displaying eight gradations, as a voltage-transmittance characteristic in the front direction. T1 (white) to T8 (black) indicate the respective gradations.
As is clear from the figure, in the direction of the lower viewing angle, a gray level inversion occurs in a black to dark gray scale area due to a small expected angle,
Image recognition becomes difficult. FIG. 18 shows the gradation-transmittance characteristics in the left and right viewing angle directions. As in the vertical viewing angle direction, gradation inversion occurs in the black to dark gradation region.

[0007] Various technical approaches have been taken to solve this problem.
It is accompanied by reliability issues and other degradation (trade-off) of display performance, and at present, no appropriate solution has been extracted yet. Therefore, an object of the present invention is to provide a liquid crystal display panel having high visibility by using a normal twisted nematic liquid crystal display panel and improving the grayscale inversion generated in the intermediate grayscale characteristics.

[0008]

According to the TFT type liquid crystal display panel of the present invention, a nematic liquid crystal layer has a twist arrangement between a TFT substrate having a TFT array group and a counter electrode substrate on which a transparent electrode film is formed. It is assumed that the crossed Nicol polarizing plate is disposed in the rubbing direction of both substrates. A two-layer uniaxial or biaxial retardation film is disposed on the counter electrode substrate, and the optical axis direction of the retardation film on the side closer to the counter electrode substrate is the same as the rubbing direction on the counter electrode substrate side. In the same direction, and arranged so as to be orthogonal to the optical axis direction of the other retardation film,
It is configured to suppress grayscale inversion at intermediate grayscales.

[0009] A configuration may be adopted in which two layers of uniaxial or biaxial retardation films are arranged on the TFT substrate instead of the counter electrode substrate. In that case, the retardation film on the side closer to the TFT substrate is arranged so that its optical axis direction is the same as the rubbing direction on the TFT substrate side, and is orthogonal to the optical axis direction of the other retardation film. You.

According to the above configuration, in the halftone display when the liquid crystal panel is viewed from the lower viewing angle direction, the retardation of the liquid crystal layer and the two-layer phase difference film formed on the counter electrode substrate or the TFT substrate are used. Optical compensation or approximate phase compensation can be performed with the retardation. As a result, the negative-positive inversion between adjacent gray scales, which has conventionally occurred, is eliminated, and a good display image that does not cause a problem in practical use can be realized.

In the above configuration, the phase difference film is
The phase difference Re (5 in the front direction at the wavelength λ = 550 nm
50) is adjusted to a range of 250 nm ≦ Re (550) ≦ 425 nm, and 380 nm ≦ λ ≦ 780 n
0.95 ≦ Re (λ) / Re (550) in the visible region of m
It can be configured such that ≦ 1.15.

In the above-mentioned configuration, preferably, a negative uniaxial liquid crystal optical film is provided between the thin film transistor substrate and the polarizing plate on the substrate and between the counter electrode substrate and the polarizing plate on the substrate. The liquid crystal optical film has a fixed hybrid alignment structure in which the liquid crystal director changes continuously from each substrate side to the polarizing plate side, and the liquid crystal alignment direction and the rubbing direction processed on each substrate. And the two-layer retardation film is disposed between the liquid crystal optical film and the polarizing plate.

According to this configuration, in the halftone display when the liquid crystal panel is viewed from the lower viewing angle direction, the retardation of the liquid crystal layer of the liquid crystal cell and the two-dimensional image formed on the counter electrode substrate are reduced.
Optical compensation or approximately phase compensation can be performed between the retardation of the layer and the retardation of the layer. As a result, the negative / positive inversion between adjacent gradations is eliminated, and a good image display that does not pose a practical problem can be realized. In addition, it is possible to improve grayscale inversion that has occurred in black to dark grayscales in the left-right viewing angle direction, and to obtain a wide viewing angle display characteristic.

The above configuration can be configured as follows. That is, the angle (θ ′) between the rubbing orientation of the liquid crystal in the liquid crystal optical film and the rubbing orientation of the nematic liquid crystal in the liquid crystal layer is −3 ° ≦ θ ′ ≦
+ 3 °, and the wavelength λ = 55 of the liquid crystal optical film.
Phase difference in front direction at 0 nm (Re '(550))
Is adjusted so that Re ′ (550) ≦ 20 nm. The two-layer retardation film has a front-side retardation (Re (550)) of 250 nm ≦ Re (550) ≦ 4.
0.95 ≦ Re (λ) / Re (550) ≦ 1.1 in the visible region of 25 nm, 380 nm ≦ λ ≦ 780 nm.
5, and the angle (θ) between the optical axis direction of the retardation film and the liquid crystal orientation direction of the liquid crystal layer is adjusted to be in the range of −1 ° ≦ θ ≦ + 1 °.

[0015]

(Embodiment 1) FIG. 1 shows a sectional structure of a TFT type liquid crystal display panel according to Embodiment 1. The configuration of the liquid crystal cell formed by the TFT substrate 4 and the counter electrode substrate 10 is the same as that of the conventional liquid crystal display panel shown in FIG. 14, and the same elements as those in FIG. Description is omitted. In the present embodiment, two identical uniaxial or biaxial retardation films 22a and 22b are laminated on the counter electrode substrate 10 and a crossed Nicol polarizing plate 19b is arranged.

FIGS. 2A and 2B are perspective views showing the optical arrangement of each element of the TFT type liquid crystal display panel in the present embodiment. FIG. 2A is an exploded view of each element, and FIG. Are shown again. 20a and 20b indicate the rubbing axis directions of the TFT substrate 4 and the counter electrode substrate 10, respectively. 23a,
23b indicates the optical axis direction of the phase difference films 22a and 22b, respectively. The optical axis direction 23a of the phase difference film 22a on the side closer to the counter electrode substrate 10 is the same direction as the rubbing direction 20b of the counter electrode substrate 10, and is orthogonal to the optical axis direction 23b of the other phase difference film 22b. Configuration. Here, 21a and 21b indicate the absorption axis directions of the polarizing plates 19a and 19b, respectively.

FIG. 3 shows a voltage-transmittance characteristic in the lower viewing angle direction. The horizontal axis is the applied voltage, and the vertical axis is the normalized value of the transmittance, showing the characteristics at various viewing angles.
(B) is an enlarged view of a main part of (a). As is clear from this graph, by using the same retardation film of two layers and designing the proper optical axis direction, the grayscale reversal at the half tone seen in the conventional liquid crystal display panel is suppressed. ing.

FIG. 4 shows transmittance characteristics in the vertical viewing angle direction in 8-gradation display. The horizontal axis represents the viewing angle, and the vertical axis represents the normalized value of the transmittance. T1 (white) to T8 (black)
Indicates each gradation. (B) is an enlarged view of a main part of (a). As is apparent from the graph, the transmittance inversion between adjacent gray scales does not occur in the halftone characteristics, and the negative-positive inversion phenomenon of the image seen in the conventional type can be improved.

Here, the design of the retardation film is based on the wavelength λ.
= 550 nm in frontal direction (Re (55
0)) is 250 nm ≦ Re (550) ≦ 425 n
m and 0.95 ≦ Re (λ) / Re (550) ≦ in the visible region of 380 nm ≦ λ ≦ 780 nm.
It was adjusted to be 1.15. As a result, it is possible to design the inversion angles (T1 and T2) at which the grayscale inversion occurs earliest in comparison with the conventional type, and a high-performance liquid crystal having excellent viewing angle characteristics and grayscale inversion characteristics. A display panel was realized.

FIG. 5 shows a modification of the liquid crystal display panel of FIG. In this example, two identical uniaxial or biaxial retardation films 22a and 22b are
Instead of the TFT substrate 4. Then, the retardation film 2 on the side close to the TFT substrate 4
The optical axis direction 23b of 2b is the same as the rubbing direction 20a of the TFT substrate 4, and is orthogonal to the optical axis direction 23a of the other retardation film 22a. Other configurations are the same as those in the example of FIG.

FIGS. 6A and 6B are perspective views showing the optical arrangement of each element of the display panel of FIG. 5, in which FIG. 6A is disassembled for each element and FIG. It is essentially the same as FIG.

The operation, characteristics, and the like of the display panel of this embodiment are substantially the same as those of the embodiment shown in FIG.

(Embodiment 2) FIG. 7 shows a sectional structure of a TFT type liquid crystal display panel according to Embodiment 2 of the present invention. The configuration of the liquid crystal cell formed by the TFT substrate 4 and the counter electrode substrate 10 is the same as that of the conventional liquid crystal display panel shown in FIG. 14, and the same elements as those in FIG. Is omitted. In the present embodiment, negative uniaxial liquid crystal optical films 24a and 24b are provided between the TFT substrate 4 and the polarizing plate 19a on the same substrate and between the counter electrode substrate 10 and the polarizing plate 19b on the same substrate, respectively. Are located. Further, two identical uniaxial or biaxial retardation films 22a and 22b are laminated on the liquid crystal optical film 24b on the counter electrode substrate 10 side, and a crossed Nicol polarizing plate is disposed on the uppermost surface. ing.

FIGS. 8A and 8B are perspective views showing the optical arrangement of each element of the TFT type liquid crystal display panel of the present invention. FIG. 8A is disassembled for each element, and FIG. Are shown again. Orientation orientation 25 of liquid crystal optical films 24a, 24b
Reference numerals a and 25b denote a fixed hybrid alignment mode in which the liquid crystal director changes continuously from the lower surface of the film (the substrate side of the liquid crystal cell) to the upper surface (the polarizing plate side of the liquid crystal cell). And the rubbing directions 20a and 20b applied to the TFT substrate 4 or the counter electrode substrate 10 are aligned. Also, the counter electrode substrate 10
The optical axis direction 23a of the retardation film 22a on the side closer to
The film configuration is the same as the rubbing direction 20a of the counter electrode substrate 10 and orthogonal to the optical axis direction 23b of the other retardation film 22b.
Here, 21a and 21b indicate the absorption axis directions of the polarizing plates 19a and 19b.

FIG. 9 shows the voltage-transmittance characteristics in the lower viewing angle direction. The horizontal axis is the applied voltage, and the vertical axis is the normalized value of the transmittance, showing the characteristics at various viewing angles.
(B) is an enlarged view of a main part of (a). As is clear from this graph, according to the present embodiment, T
Conventional configuration by arranging a liquid crystal optical film on each of the FT substrate and the counter electrode substrate, and arranging two layers of the same retardation film on the liquid crystal optical film on the counter electrode substrate side with the appropriate optical axis orientation adjusted. In contrast to this, it is possible to suppress grayscale inversion at the time of halftone.

FIG. 10 shows the transmittance characteristic in the vertical viewing angle direction in the 8-gradation display. The horizontal axis represents the viewing angle, and the vertical axis represents the normalized value of the transmittance. T1 (white) to T8 (black) indicate the respective gradations. (B) is an enlarged view of a main part of (a). As is apparent from the graph, no transmittance inversion occurs between adjacent gray levels in the halftone region, and it is possible to overcome the negative-positive inversion of the display image. FIG.
Reference numeral 1 denotes a transmittance characteristic in the left-right viewing angle direction in 8-gradation display. It can be seen that, similarly to the vertical viewing angle characteristic, the gradation inversion that has occurred so far in black to dark gradation has been improved.

Here, the angle between the rubbing orientation in the liquid crystal optical film and the rubbing orientation in the liquid crystal cell is set to -3 ° ≦ θ ′ ≦ + 3 °, and the front phase difference of the liquid crystal optical film is Re ′ (550). ) ≦ 20 nm
May be adjusted. The two-layer retardation film has a retardation in the front direction of 250 nm ≦ Re (550) ≦ 425.
380 nm ≦ λ ≦ 780 nm
0.95 ≦ Re (λ) / Re (550) ≦ in the visible region of
1.15, and the angle (θ) between the optical axis direction of the retardation film and the liquid crystal orientation direction of the liquid crystal cell is −1 ° ≦ θ ≦
There is no problem if the design is made within the range of + 1 °. As a result, the inversion angles (T1 and T2) at which the grayscale inversion occurs earliest can be designed to be larger than those of the conventional type, and a high-quality liquid crystal display panel having excellent wide viewing angle characteristics can be realized. .

FIG. 12 shows a modification of the liquid crystal display panel of FIG. In this example, two identical uniaxial or biaxial retardation films 22a and 22b are
It is configured to be laminated on the TFT substrate 4 instead of 0. Then, the retardation film 2 on the side close to the TFT substrate 4
The optical axis direction 23b of 2b is the same direction as the rubbing direction 20a of the TFT substrate 4, and is orthogonal to the optical axis direction 23a of the other retardation film 22a. Other configurations are the same as those in the example of FIG.

FIGS. 13A and 13B are perspective views showing the optical arrangement of each element of the display panel of FIG. 12, wherein FIG. 13A is disassembled for each element and FIG. It is essentially the same as FIG.

The operation, characteristics, and the like of the display panel of this embodiment are substantially the same as those of the embodiment shown in FIG.

[0031]

(Example 1) A liquid crystal display panel having the structure shown in FIG. 1 was manufactured. The cell thickness (d) is d = 4.7 μm, and the refractive index anisotropy (Δn) is Δn = 0.080 (λ = 550 n)
m) and the twist angle (θ) = 90 °. The retardation films 22a and 22b are designed so that the retardation in the front direction is
(550) = 340 nm, 380 nm ≦ λ ≦ 780
0.95 ≦ Re (λ) / Re (55 in the visible region of nm
0) A polycarbonate polymer film satisfying ≤ 1.15 was used. The applied voltage of the liquid crystal is a white voltage (V
W) is VW = 0 (V), and the black voltage (VB) is VB = 5.
(V).

As shown in FIGS. 3 and 4, the obtained TFT type liquid crystal display panel can suppress the grayscale inversion in the halftone display in the lower viewing angle direction and has the same front contrast as the conventional type. The high contrast described above could be obtained, and a high-quality display image could be provided.

Example 2 A liquid crystal display panel having the structure shown in FIG. 7 was manufactured. The cell thickness (d) is d = 4.7 μm, and the refractive index anisotropy (Δn) is Δn = 0.080 (λ = 550 n)
m) and the twist angle (θ) = 90 °. Also, the front phase difference of the liquid crystal optical films 24a and 24b is set to Re ′ (55).
0) = 20 nm, and the angle between the orientation of the film liquid crystal and the orientation of the liquid crystal of the liquid crystal cell was adjusted to −3 ° ≦ θ ′ ≦ + 3 °. On the other hand, a uniaxial or biaxial retardation film 2
The front phase difference between 2a and 22b is Re (550) = 315n
m in the visible region of 380 nm ≦ λ ≦ 780 nm.
A polycarbonate polymer film satisfying 95 ≦ Re (λ) / Re (550) ≦ 1.15 was used. The angle (θ) between the optical axis directions of the retardation films 22a and 22b and the liquid crystal alignment direction of the liquid crystal cell was set to -1 ° ≦ θ ≦ + 1 °. Further, the applied voltage of the liquid crystal is obtained by converting the white voltage (VW) to VW.
= 0 (V), and the black voltage (VB) was set to VB = 5 (V).

As shown in FIGS. 9, 10 and 11, the obtained TFT type liquid crystal display panel can suppress the grayscale inversion in the halftone display in the lower viewing angle direction, and can reduce the front contrast. It was possible to provide a high-quality display image capable of obtaining a high contrast equal to or higher than that of the mold.

[0035]

According to the TFT type liquid crystal display panel of the present invention, the same uniaxial or biaxial retardation film of two layers laminated on a TFT substrate or a counter electrode substrate can be used.
It is possible to provide a high-quality display image that can achieve a wide viewing angle and also achieve a high contrast equal to or higher than the conventional one by being able to suppress the grayscale inversion that has conventionally occurred in the intermediate grayscale. it can.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a thin-film transistor liquid crystal display panel according to Embodiment 1 of the present invention.

FIG. 2 is a perspective view showing an optical arrangement of each element of the liquid crystal display panel in Embodiment 1.

FIG. 3 shows a voltage of the liquid crystal display panel according to the first embodiment.
Transmittance characteristic diagram

FIG. 4 is a vertical viewing angle-transmittance characteristic diagram of the liquid crystal display panel in Embodiment 1.

FIG. 5 is a cross-sectional view illustrating a modification of the liquid crystal display panel in Embodiment 1.

6 is a perspective view showing an optical arrangement of the liquid crystal display panel of FIG.

FIG. 7 is a cross-sectional view of a thin-film transistor liquid crystal display panel according to Embodiment 2 of the present invention.

FIG. 8 is a perspective view showing an optical arrangement of each element of a liquid crystal display panel in Embodiment 2.

FIG. 9 shows a voltage of a liquid crystal display panel in Embodiment 2.
Transmittance characteristic diagram

FIG. 10 is a view showing a vertical viewing angle-transmittance characteristic of a liquid crystal display panel in Embodiment 2.

FIG. 11 is a left-right viewing angle-transmittance characteristic diagram of a liquid crystal display panel in Embodiment 2.

FIG. 12 is a cross-sectional view illustrating a modification of the liquid crystal display panel in Embodiment 2.

13 is a perspective view showing an optical arrangement of each element of the liquid crystal display panel of FIG.

FIG. 14 is a cross-sectional view of a conventional thin film transistor type liquid crystal display panel.

FIG. 15 is a perspective view showing an optical arrangement of each element of the thin film transistor type liquid crystal display panel of FIG. 14;

FIG. 16 is a voltage-transmittance characteristic diagram of a liquid crystal display panel in a conventional example.

FIG. 17 shows a vertical viewing angle of a liquid crystal display panel in a conventional example.
Transmittance characteristic diagram

FIG. 18 is a left-right viewing angle of a conventional liquid crystal display panel.
Transmittance characteristic diagram

[Explanation of symbols]

 1, 5 glass substrate 2 array chip 3, 9 polyimide alignment film 4 TFT substrate 6a black matrix layer 6b black matrix layer 7 coloring layer 8 counter electrode 10 counter electrode substrate 11 seal resin 12 liquid crystal 13 overcoat layer 14 spacer 15 conductive resin 18 pixel electrode 19a, 19b polarizing plate 20 retardation film 24 liquid crystal optical film

Claims (6)

[Claims] 1. A nematic liquid crystal layer is sandwiched between a thin film transistor substrate having a thin film transistor array group and a counter electrode substrate on which a transparent electrode film is formed in a twist arrangement, and a crossed Nicol layer is formed in a rubbing direction between the two substrates. In the thin film transistor type liquid crystal display panel in which a polarizing plate is disposed, two layers of uniaxial or biaxial retardation films are disposed on the counter electrode substrate, and the retardation film on the side close to the counter electrode substrate is The optical axis direction is the same as the rubbing direction on the counter electrode substrate side, and is arranged so as to be orthogonal to the optical axis direction of the other retardation film, thereby suppressing grayscale inversion at intermediate grayscales. A thin film transistor type liquid crystal display panel characterized in that: 2. A nematic liquid crystal layer is sandwiched in a twist arrangement between a thin film transistor substrate having a thin film transistor array group and a counter electrode substrate on which a transparent electrode film is formed. In a thin film transistor type liquid crystal display panel on which a polarizing plate is disposed, two layers of uniaxial or biaxial retardation films are disposed on the thin film transistor substrate, and the retardation film on the side close to the thin film transistor substrate is: The optical axis direction is the same as the rubbing direction on the thin film transistor substrate side, and is arranged so as to be orthogonal to the optical axis direction of the other retardation film, thereby suppressing grayscale inversion at intermediate grayscales. A thin film transistor type liquid crystal display panel characterized in that: 3. The retardation film has a wavelength λ = 550 nm.
, The phase difference Re (550) in the front direction is 250n
It is adjusted within the range of m ≦ Re (550) ≦ 425 nm, and is set to 0.3 in the visible region of 380 nm ≦ λ ≦ 780 nm.
3. The thin film transistor type liquid crystal display panel according to claim 1, wherein 95 ≦ Re (λ) / Re (550) ≦ 1.15. 4. A liquid crystal optical film having a negative uniaxial liquid crystal optical film disposed between a thin film transistor substrate and a polarizing plate on the substrate and between a counter electrode substrate and a polarizing plate on the same substrate, respectively. Has a fixed hybrid alignment structure in which the liquid crystal director changes continuously from each substrate side to the polarizing plate side, and the liquid crystal alignment direction matches the rubbing direction processed on each substrate. And the two-layer retardation film is
The thin film transistor type liquid crystal display panel according to claim 1, wherein the liquid crystal display panel is disposed between the liquid crystal optical film and the polarizing plate. 5. An angle (θ ′) between a rubbing orientation of a liquid crystal in a liquid crystal optical film and a rubbing orientation of a nematic liquid crystal in a liquid crystal layer is in a range of −3 ° ≦ θ ′ ≦ + 3 °. The phase difference (Re ′ (550)) in the front direction at the wavelength λ = 550 nm is Re ′.
(550) ≦ 20 nm, and the two-layer retardation film has a retardation (Re (55)
0)) is 250 nm ≦ Re (550) ≦ 425 nm, 3
0.95 in the visible region of 80 nm ≦ λ ≦ 780 nm
≦ Re (λ) / Re (550) ≦ 1.15, and the angle (θ) between the optical axis direction of the retardation film and the liquid crystal alignment direction of the liquid crystal layer is in the range of −1 ° ≦ θ ≦ + 1 °. The thin film transistor type liquid crystal display panel according to claim 4, wherein the liquid crystal display panel is adjusted so as to be as follows. 6. An image display application device comprising the thin-film transistor liquid crystal display panel according to claim 1. Description: