CN101131509B - LCD panel - Google Patents

Abstract

The invention discloses a liquid crystal display panel, which comprises an active array substrate, an opposite substrate and an optical self-compensation birefringence liquid crystal layer. The active array substrate comprises a first substrate, a plurality of first wires, a plurality of second wires, a plurality of pixel structures and a first alignment film. The first alignment film has a first alignment direction, and an included angle between the first alignment direction and the first wiring is between 46 degrees and 74 degrees. The opposite substrate is provided with a second alignment film facing the active array substrate, and the second alignment film is provided with a second alignment direction parallel to the first alignment direction. The optically self-compensated birefringence liquid crystal layer is disposed between the active array substrate and the opposite substrate. Therefore, the visual angle range of the liquid crystal display panel can be improved.

Description

LCD panel

technical field

The present invention relates to a liquid crystal display panel, and in particular to an optical self-compensating birefringence liquid crystal display panel.

Background technique

Liquid crystal display devices are divided into many types according to the type of liquid crystal used, the driving method, the arrangement position of the light source, and the like. Among them, the Optically Compensated Birefringence (Optically Compensated Birefringence, OCB) liquid crystal display device has a fast response speed, which can provide a smoother picture performance when the computer plays fast-changing continuous pictures such as animation or movies, so it is very suitable for Applications of high-end liquid crystal display devices. However, the optical self-compensating birefringence liquid crystal display device (hereinafter referred to as the OCB liquid crystal display device) must allow the optical self-compensating birefringent liquid crystal molecules (hereinafter referred to as the OCB liquid crystal molecules) to convert from the splay state to the bend state. ) to enter the standby state, and provide quick response work performance.

However, in the existing OCB liquid crystal display device, since the angle between the alignment direction of the alignment film and the scanning wiring of the active array substrate is 90 degrees, in this alignment mode, the viewing angle range of the existing OCB liquid crystal display device Smaller, so it can't meet the wide viewing angle specifications.

FIG. 1 is a perspective view of a conventional liquid crystal display device. Please refer to Figure 1, using the existing alignment method, under the contrast value of 10 as the lowest viewing condition, the horizontal viewing angle is 160 degrees, and the vertical viewing angle is 140 degrees, which does not meet the specification requirements for wide viewing angles. In addition, the maximum contrast value is 323.44, and there is still considerable room for improvement.

Contents of the invention

In view of this, the purpose of the present invention is to provide a liquid crystal display panel to improve the viewing angle range.

The invention provides a liquid crystal display panel, which includes an active array substrate, an opposite substrate and an optical self-compensation birefringence liquid crystal layer. The active array substrate includes a first substrate, a plurality of first wirings, a plurality of second wirings, a plurality of pixel structures and a first alignment film. Wherein, the first wiring and the second wiring are arranged on the first substrate, and the pixel structure is arranged on the first substrate, and are respectively driven by the first wiring and the second wiring. The first alignment film is arranged on the first substrate and covers the first wiring, the second wiring and the pixel structure, and the first alignment film has a first alignment direction, and the angle between the first alignment direction and the first wiring Between 46 degrees and 74 degrees. The opposite substrate has a second alignment film facing the active array substrate, and the second alignment film has a second alignment direction parallel to the first alignment direction. The optical self-compensation birefringence liquid crystal layer is arranged between the active array substrate and the opposite substrate.

In an embodiment of the present invention, the included angle between the first alignment direction and the first wiring is between 46 degrees and 54 degrees.

In an embodiment of the present invention, the first wiring is a scan wiring, and the second wiring is a data wiring.

In an embodiment of the present invention, the first wiring is a data wiring, and the second wiring is a scanning wiring.

In an embodiment of the present invention, the liquid crystal display panel further includes a first polarizer and a second polarizer. Wherein, the first polarizer is disposed on the surface of the active array substrate away from the opposite substrate, and the first polarizer has a first polarization direction, and the first polarization direction is parallel to the first wiring. The second polarizer is disposed on the surface of the opposite substrate away from the active array substrate, and the second polarizer has a second polarization direction, and the included angle between the second polarization direction and the first polarization direction is 90 degrees.

In an embodiment of the present invention, the liquid crystal display panel further includes a first compensation film and a second compensation film. Wherein, the first compensation film is disposed between the active array substrate and the first polarizer, and the first compensation film has a first axis parallel to the first alignment direction. The second compensation film is disposed between the opposite substrate and the second polarizer, and the second compensation film has a second axis parallel to the second alignment direction.

In an embodiment of the present invention, each pixel structure includes an active device and a pixel electrode. Wherein, the active element is electrically connected with the corresponding first wiring and the second wiring, and the pixel electrode is electrically connected with the active element.

In an embodiment of the present invention, the opposite substrate further includes a second substrate, a color filter layer and a common electrode layer. Wherein, the color filter layer is configured on the second substrate. The common electrode layer is disposed on the color filter layer, and the second alignment film is disposed on the common electrode layer.

Based on the above, in the active array substrate of the liquid crystal display panel of the present invention, the included angle between the first alignment direction of the first alignment film and the first wiring is between 46 degrees and 74 degrees, so the viewing angle can be effectively improved. range to meet the specification requirements for wide viewing angles. In addition, compared with the prior art, the liquid crystal display panel of the present invention has a larger maximum contrast value.

In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments are specifically cited below and described in detail with accompanying drawings.

Description of drawings

FIG. 1 is a perspective view of a conventional liquid crystal display device.

FIG. 2 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 3 is a top view of an active array substrate according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present invention.

FIG. 5 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.

FIG. 6 is a perspective view of a liquid crystal display device according to another embodiment of the present invention.

Detailed ways

FIG. 2 is a cross-sectional view of a liquid crystal display device according to an embodiment of the present invention. FIG. 3 is a top view of an active array substrate according to an embodiment of the present invention. FIG. 4 is a schematic diagram of a liquid crystal display panel according to an embodiment of the present invention.

First, please refer to FIG. 2 , the liquid crystal display device 100 of this embodiment includes a backlight assembly 102 and a liquid crystal display panel 104 . Wherein, the backlight assembly 102 is composed of, for example, a light guide plate 106 , a reflector 108 and a light source 110 . More specifically, the light guide plate 106 is, for example, a wedge-shaped light guide plate. In addition, the reflection cover 108 is disposed beside the light incident surface (not shown) of the light guide plate 106 , and the light source 110 is disposed inside the reflection cover 108 . The above-mentioned light source 110 is, for example, a cold-cathode fluorescent lamp (CCFL) suitable for providing white light or a light-emitting diode array.

Please refer to FIG. 2 and FIG. 3 at the same time. The liquid crystal display panel 104 is disposed on the backlight assembly 102 , and the liquid crystal display panel 102 includes an active array substrate 112 , an opposite substrate 114 and an optical self-compensating birefringent liquid crystal layer 116 . Wherein, the sealant 150 and the optical self-compensating birefringent liquid crystal layer 116 are disposed between the active array substrate 112 and the opposite substrate 114 , and the sealant 150 surrounds the optical self-compensating birefringent liquid crystal layer 116 . In addition, a spacer (Spacer) 152 may also be disposed between the active array substrate 112 and the opposite substrate 114 to maintain a gap (Gap) between the active array substrate 112 and the opposite substrate 114 .

The active array substrate 112 includes a first substrate 118 , a plurality of first wirings 120 , a plurality of second wirings 122 , a plurality of pixel structures 124 and a first alignment film 126 . Wherein, the first wiring 120 and the second wiring 122 are disposed on the first substrate 118 . In this embodiment, the first wiring 120 is a scan wiring, and the second wiring 122 is a data wiring. However, in another embodiment, the first wire 120 can be adjusted as a data wire, and the second wire 122 can be adjusted as a scan wire.

The pixel structure 124 is disposed on the first substrate 118 and driven by the first wiring 120 and the second wiring 122 respectively. The pixel structure 124 includes an active device 128 and a pixel electrode 130 . Wherein, the active element 128 is electrically connected to the corresponding first wiring 120 and the second wiring 122 . In addition, the active device 128 is, for example, a thin film transistor, and the pixel electrode 130 is electrically connected to the active device 128 through the contact window 132 , for example. In addition, the first alignment film 126 is disposed on the first substrate 118 and covers the first wiring 120 , the second wiring 122 and the pixel structure 124 . Moreover, the first alignment film 126 has a first alignment direction 134, and the included angle θ between the first alignment direction 134 and the first wiring 120 is between 46 degrees and 74 degrees, preferably between 46 degrees. to 54 degrees, more preferably 50 degrees.

Please refer to FIG. 2 and FIG. 4 at the same time, the opposite substrate 114 includes a second substrate 140 , a color filter layer 142 , a common electrode layer 144 and a second alignment film 136 . Wherein, the color filter layer 142 is disposed on the second substrate 140 , and the color filter layer 142 is composed of, for example, a black matrix (Black matrix) 146 and a color filter film 148 . In addition, the common electrode layer 144 is disposed on the color filter layer 142 . The second alignment film 136 is disposed on the common electrode layer 144 , and the second alignment film 136 has a second alignment direction 138 parallel to the first alignment direction 134 .

Although the color filter layer 142 in this embodiment is separated from the active array substrate 112, the color filter layer 142 can also be fabricated on the active array substrate 112 (color filter on array). At this time, the opposite substrate 114 of this type does not have the color filter layer 142 .

Please continue to refer to FIG. 2 and FIG. 4 , in this embodiment, the liquid crystal display panel 104 may further include a first polarizer 154 and a second polarizer 156 . Depending on the normal black display or the normal white display, the polarization directions of the first polarizer 154 and the second polarizer 156 will also be different. In this embodiment, a normal white screen is used. At this time, the first polarizer 154 is disposed on the surface of the active array substrate 118 away from the opposite substrate 114, and the first polarizer 154 has a first polarization direction 162, and the first polarization direction 162 and the first wiring 120 are parallel. In addition, the second polarizer 156 is disposed on the surface of the opposite substrate 114 away from the active array substrate 112, and the second polarizer 156 has a second polarization direction 164, and the second polarization direction 164 is the same as that of the first polarization direction 162. The included angle is 90 degrees. However, in another embodiment, if a normally black screen is used for display, the first polarization direction 162 of the first polarizer 154 and the second polarization direction 164 of the second polarizer 156 are parallel to each other.

Please continue to refer to FIG. 2 and FIG. 4 , in order to improve display quality, the liquid crystal display panel 104 may further include a first compensation film 158 and a second compensation film 160 . Wherein, the first compensation film 158 is disposed between the active array substrate 112 and the first polarizer 154 , and the first compensation film 158 has a first axis 166 parallel to the first alignment direction 134 . In addition, the second compensation film is disposed 160 between the opposite substrate 114 and the second polarizer 156 , and the second compensation film 158 has a second axis 168 parallel to the second alignment direction 138 .

Since the angle θ between the first alignment direction 134 of the first alignment film 126 and the first wiring 120 is between 46 degrees and 74 degrees to change the alignment of liquid crystal molecules, compared with the prior art, the present invention can Increase the range of viewing angles to meet the specification requirements for wide viewing angles. In addition, since the present invention changes the alignment direction of the alignment film, compared with the prior art, the present invention can increase the maximum contrast value. The display quality of the liquid crystal display device 100 of this embodiment will be described in detail later.

FIG. 5 is a perspective view of a liquid crystal display device according to an embodiment of the present invention. Please refer to Figure 5. Under the condition that the angle between the alignment direction of the alignment film and the scanning wiring of the active array substrate is 45 degrees, the actual test result is that under the lowest visual condition with a contrast value of 10, the horizontal viewing angle Up to 170 degrees, the vertical viewing angle can also reach 170 degrees, and the maximum contrast value is 480.5.

FIG. 6 is a perspective view of a liquid crystal display device according to another embodiment of the present invention. Please refer to Figure 6. In the case where the angle between the alignment direction of the alignment film and the scanning wiring of the active array substrate is 50 degrees, the actual test result is that under the lowest visual condition with a contrast value of 10, the horizontal viewing angle It can reach 170 degrees, and the vertical viewing angle can also reach 170 degrees, and the maximum contrast value is 524.9.

Please refer to FIG. 1 , FIG. 5 and FIG. 6 at the same time, comparing the present invention with the existing liquid crystal display device, the optical performance is also under the condition that the contrast value is 10 as the minimum visual condition. The existing liquid crystal display device has a horizontal viewing angle of 160 degrees, a vertical viewing angle of 140 degrees, and a maximum contrast value of 323.44 (please refer to FIG. 1 ). However, the horizontal viewing angle of the liquid crystal display device of the present invention can be 170 degrees, the vertical viewing angle is 170 degrees, and the maximum contrast values are 480.5 and 524.9 (please refer to FIG. 5 and FIG. 6 ). In other words, compared with the prior art, the alignment method of the present invention greatly improves both the viewing angle and the maximum contrast value.

In summary, the present invention has at least the following advantages:

1. Since the present invention changes the alignment direction of the alignment film, compared with the prior art, the liquid crystal display panel of the present invention has a larger viewing angle range and can meet the specification requirement of wide viewing angle.

2. The liquid crystal display panel of the present invention has a relatively large maximum contrast value.

Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection should be defined by the claims.

Claims (8)

1. display panels comprises:

One active array substrate comprises:

One first substrate;

Many first distributions and many second distributions are disposed on this first substrate;

A plurality of dot structures are disposed on this first substrate, and drive by those first distributions and those second distributions respectively; And

One first alignment film, be disposed on this first substrate, and cover those first distributions, those second distributions and those dot structures, and this first alignment film has one first alignment direction, and the angle of this first alignment direction and those first distributions is between 46 degree are spent to 74;

One subtend substrate have one second alignment film towards this active array substrate, and this second alignment film has one second alignment direction parallel with this first alignment direction; And

One optics self-compensating birefringence mode liquid crystal layer is disposed between this active array substrate and this subtend substrate.

2. display panels as claimed in claim 1 is characterized in that, the angle of this first alignment direction and those first distributions is between 46 degree are spent to 54.

3. display panels as claimed in claim 1 is characterized in that, those first distributions are scan wiring, and those second distributions are data wiring.

4. display panels as claimed in claim 1 is characterized in that, those first distributions are data wiring, and those second distributions are scan wiring.

5. display panels as claimed in claim 1 is characterized in that, also comprises:

One first polaroid is disposed on the surface away from this subtend substrate of this active array substrate, and this first polaroid has one first polarization direction, and this first polarization direction is parallel with those first distributions; And

One second polaroid is disposed on the surface away from this active array substrate of this subtend substrate, and this second polaroid has one second polarization direction, and the angle of this second polarization direction and this first polarization direction is 90 degree.

6. display panels as claimed in claim 5 is characterized in that, also comprises:

One first compensate film is disposed between this active array substrate and this first polaroid, and this first compensate film has parallel with this first alignment direction one first axial; And

One second compensate film is disposed between this subtend substrate and this second polaroid, and this second compensate film has parallel with this second alignment direction one second axial.

7. display panels as claimed in claim 1 is characterized in that, respectively this dot structure comprises:

One active member is electrical connected with corresponding this first distribution and this second distribution; And

One pixel electrode is electrical connected with this active member.

8. display panels as claimed in claim 1 is characterized in that, this subtend substrate also comprises:

One second substrate;

One chromatic filter layer is disposed on this second substrate; And

Use electrode layer altogether, be disposed on this chromatic filter layer, and this second alignment film is disposed on this common electrode layer.

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