CN110673407B - Liquid crystal display device having a plurality of pixel electrodes - Google Patents

Liquid crystal display device having a plurality of pixel electrodes Download PDF

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CN110673407B
CN110673407B CN201910961648.8A CN201910961648A CN110673407B CN 110673407 B CN110673407 B CN 110673407B CN 201910961648 A CN201910961648 A CN 201910961648A CN 110673407 B CN110673407 B CN 110673407B
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electrode
pixel
pixel electrode
liquid crystal
display device
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CN110673407A (en
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黄霞
王新刚
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InfoVision Optoelectronics Kunshan Co Ltd
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InfoVision Optoelectronics Kunshan Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/1323—Arrangements for providing a switchable viewing angle
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • G02F1/133707—Structures for producing distorted electric fields, e.g. bumps, protrusions, recesses, slits in pixel electrodes
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1343—Electrodes
    • G02F1/134309—Electrodes characterised by their geometrical arrangement
    • G02F1/134345—Subdivided pixels, e.g. for grey scale or redundancy

Abstract

The invention discloses a liquid crystal display device which comprises an array substrate, a color film substrate and a liquid crystal layer, wherein a plurality of pixel units are limited by scanning lines and data lines on the array substrate, the array substrate comprises a common electrode and a pixel electrode, a pixel electrode is arranged in each pixel unit, the pixel electrode comprises a first pixel electrode and a second pixel electrode, the first pixel electrode comprises a first electrode strip, the second pixel electrode comprises a second electrode strip, the extending directions of the first electrode strip and the second electrode strip are different, the color film substrate comprises a visual angle control electrode, and the visual angle control electrode is arranged corresponding to the first pixel electrode and the second pixel electrode. According to the liquid crystal display device, the pixel electrodes comprise the first pixel electrode and the second pixel electrode which are different in extending direction, liquid crystal only needs to be aligned in a single direction, different voltages are applied to the viewing angle control electrode, the liquid crystal display device can be switched between a wide viewing angle and a full-narrow viewing angle, various requirements of users can be met, and the display effect is good.

Description

Liquid crystal display device having a plurality of pixel electrodes
Technical Field
The invention relates to the technical field of liquid crystal display, in particular to a liquid crystal display device.
Background
The liquid crystal display device has the advantages of good picture quality, small volume, light weight, low driving voltage, low power consumption, no radiation and relatively low manufacturing cost, and is dominant in the field of flat panel display.
With the continuous progress of the liquid crystal display technology, the viewing angle of the display has been widened from about 120 ° to over 160 °, and people want to effectively protect business confidentiality and personal privacy while enjoying the visual experience brought by a large viewing angle, so as to avoid business loss or embarrassment caused by the leakage of screen information. Therefore, in addition to the wide viewing angle, the display device is also required to have a function of switching between the wide viewing angle and the narrow viewing angle.
At present, in order to protect commercial confidentiality and personal privacy, a shutter film is mainly attached to a display screen to realize switching between a wide viewing angle and a narrow viewing angle. However, this method requires additional preparation of the louver films, which causes great inconvenience to the user, and one louver film can only realize one viewing angle, and once the louver films are attached, the viewing angle is fixed in the narrow viewing angle mode. In addition, this method can only realize a narrow viewing angle in a single direction (such as the transverse direction), cannot realize a wide and narrow viewing angle in all directions (i.e. the transverse direction and the vertical direction) at the same time, has serious brightness loss, and has high manufacturing cost, and is difficult to meet the use requirement.
Disclosure of Invention
The invention aims to provide a liquid crystal display device capable of realizing omnibearing wide and narrow visual angle switching.
The embodiment of the invention provides a liquid crystal display device, which comprises an array substrate, a color film substrate arranged opposite to the array substrate and a liquid crystal layer positioned between the array substrate and the color film substrate, wherein a plurality of pixel units are limited by scanning lines and data lines on the array substrate, the array substrate comprises a common electrode and a pixel electrode, one pixel electrode is arranged in each pixel unit, the pixel electrode comprises a first pixel electrode and a second pixel electrode, the first pixel electrode comprises a first electrode strip, the second pixel electrode comprises a second electrode strip, the extending directions of the first electrode strip and the second electrode strip are different, the color film substrate comprises a visual angle control electrode, and the visual angle control electrode is arranged corresponding to the first pixel electrode and the second pixel electrode.
In one embodiment, each pixel unit is provided with one first pixel electrode and one second pixel electrode; or, each pixel unit is provided with one first pixel electrode or one second pixel electrode, part of the pixel units are provided with the first pixel electrodes, and part of the pixel units are provided with the second pixel electrodes; or, part of the pixel electrodes in the pixel unit comprise the first pixel electrode and the second pixel electrode; or, the first pixel electrode or the second pixel electrode is arranged in only part of the pixel units.
In one embodiment, when one of the first pixel electrode and the second pixel electrode is disposed in each of the pixel units, the first pixel electrode is disposed in a part of the pixel units, and the second pixel electrode is disposed in a part of the pixel units, the first pixel electrode and the second pixel electrode are alternately disposed in a row; or, the first pixel electrodes and the second pixel electrodes are alternately arranged in columns; or, the first pixel electrode and the second pixel electrode are arranged in a staggered mode.
In an embodiment, when the first pixel electrode and the second pixel electrode are disposed in part of the pixel units, four adjacent pixel units form a pixel unit group, and the pixel electrode in one pixel unit in each pixel unit group includes the first pixel electrode and the second pixel electrode.
In one embodiment, the included angle between the first electrode strip and the second electrode strip is 30-90 °.
In one embodiment, the included angle between the first electrode strips and the transverse direction is-20 degrees to-20 degrees, and the included angle between the second electrode strips and the longitudinal direction is-20 degrees to-20 degrees.
In one embodiment, the initial alignment direction of the liquid crystal layer is the same throughout the liquid crystal display device.
In one embodiment, the alignment directions of the array substrate and the color film substrate are parallel.
In one embodiment, an included angle between the alignment direction of the liquid crystal layer and the first electrode bar is half ± 5 ° of an included angle between the first electrode bar and the second electrode bar.
In one embodiment, the area ratio of the first pixel electrode to the second pixel electrode is 1:1 to 0.5.
According to the liquid crystal display device, the pixel electrodes comprise the first pixel electrode and the second pixel electrode which are different in extending direction, liquid crystal only needs to be aligned in a single direction, different voltages are applied to the viewing angle control electrode, the liquid crystal display device can be switched between a wide viewing angle and a full-narrow viewing angle, various requirements of users can be met, and the display effect is good.
Drawings
Fig. 1 is a schematic plan view of a liquid crystal display device according to a first embodiment of the present invention.
Fig. 2 is a schematic cross-sectional view of the liquid crystal display device shown in fig. 1 with a wide viewing angle.
Fig. 3 is a schematic cross-sectional view of the liquid crystal display device shown in fig. 1 with a narrow viewing angle.
Fig. 4 is a schematic plan view of a liquid crystal display device according to a second embodiment of the invention.
Fig. 5 is a schematic plan view of a liquid crystal display device according to a third embodiment of the invention.
Fig. 6 is a schematic cross-sectional view of the liquid crystal display device shown in fig. 5 with a wide viewing angle.
Fig. 7 is a schematic cross-sectional view of the liquid crystal display device shown in fig. 5 with a narrow viewing angle.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description of the embodiments, structures, features and effects of the present invention will be made with reference to the accompanying drawings and examples.
First embodiment
Referring to fig. 1 and fig. 2, a liquid crystal display device according to a first embodiment of the invention includes an array substrate 10, a color filter substrate 30 disposed opposite to the array substrate 10, and a liquid crystal layer 50 disposed between the thin film transistor array substrate 10 and the color filter substrate 30.
A plurality of pixel units P are defined on the array substrate 10 by the scan lines 100 and the data lines 101. The array substrate 10 includes a first substrate 102, a thin film transistor (not shown), a common electrode 104, and a pixel electrode, where one pixel electrode and one thin film transistor are disposed in each pixel unit. The pixel electrodes include a first pixel electrode 106a and a second pixel electrode 106b, one first pixel electrode 106a and one second pixel electrode 106b are disposed in each pixel unit P, the first pixel electrode 106a includes a first electrode strip, and the second pixel electrode 106b includes a second electrode strip. The extending directions of the first electrode strips and the second electrode strips are different. Specifically, the thin film transistor includes a gate electrode, a source electrode and a drain electrode, wherein the gate electrode is electrically connected to the corresponding scan line 100, the gate electrode may be independently disposed or may be a part of the scan line 100, the source electrode is electrically connected to the corresponding data line 101, and the drain electrode is electrically connected to the corresponding pixel electrode. In this embodiment, the common electrode 104 and the pixel electrode are located in different layers, an insulating layer 107 is interposed between the common electrode 104 and the pixel electrode, the pixel electrode is disposed above the common electrode 104, the pixel electrode is a slit-shaped electrode, and the common electrode 104 is a planar electrode covering the entire surface of the first substrate 102, but the invention is not limited thereto.
In this embodiment, an included angle between the first electrode strips and the second electrode strips may be 30 ° to 90 °. Preferably, the included angle between the first electrode strip and the transverse direction is-20 degrees to-20 degrees, and the included angle between the second electrode strip and the longitudinal direction is-20 degrees to-20 degrees. Through designing the extending direction of the pixel electrode like this, the display effect is better when can make narrow visual angle mode, has good peep-proof effect.
In this embodiment, in each pixel unit P, the area ratio of the first pixel electrode 106a to the second pixel electrode 106b is 1: 1-0.5. Through the design of the area ratio, the display effect is better in a narrow visual angle mode, and the peep-proof effect is good.
The color filter substrate 30 includes a second substrate 302 and a color resist layer 304 disposed on the second substrate 302. The color resist layer 304 is, for example, R, G, B color resist. The color resist layer 304 is provided on the surface of the second substrate 302 on the side closer to the liquid crystal layer 50. A Black Matrix (BM) may be disposed between color resists of the color resist layer 304 to prevent light of different colors from being mixed. The color filter substrate 30 further includes a viewing angle control electrode 306. The viewing angle control electrode 306 covers the entire display area, i.e. the viewing angle control electrode 306 is a planar electrode. The viewing angle control electrode 306 is provided on a surface of the color resist layer 304 on a side thereof close to the liquid crystal layer 50. The color filter substrate 30 further includes a protection layer 309, and the protection layer 309 is disposed on a surface of the viewing angle control electrode 306 close to the liquid crystal layer 50. In this embodiment, the viewing angle control electrode 306 is made of a transparent conductive material, such as an ITO (indium tin oxide) material.
In this embodiment, the liquid crystal molecules in the liquid crystal layer 50 are positive liquid crystal molecules, and the positive liquid crystal molecules have the advantage of fast response. In an initial state (i.e., in a state where no voltage is applied to the liquid crystal display device), the positive liquid crystal molecules in the liquid crystal layer 50 are in a lying posture substantially parallel to the array substrate 10 and the color filter substrate 30, i.e., the long axis direction of the positive liquid crystal molecules is substantially parallel to the surfaces of the array substrate 10 and the color filter substrate 30. However, in practical applications, a smaller initial pretilt angle may be provided between the positive liquid crystal molecules in the liquid crystal layer 50 and the array substrate 10 and the color filter substrate 30, and the range of the initial pretilt angle may be less than or equal to 10 degrees, that is: the pretilt angle is more than or equal to 0 degree and less than or equal to 10 degrees. Of course, the liquid crystal molecules in the liquid crystal layer 50 may also be negative liquid crystal molecules.
In this embodiment, in the entire liquid crystal display device, the initial alignment directions of the liquid crystal layer 50 are the same, and the alignment directions of the array substrate 10 and the color filter substrate 30 are parallel. More specifically, the angle between the alignment direction of the liquid crystal layer 50 and the first electrode bars is half of the angle between the first electrode bars and the second electrode bars ± 5 ° (L1 in fig. 1 is the alignment direction of an embodiment). The initial alignment directions of the liquid crystal layer 50 are designed to be the same, so that the alignment process can be simplified and the manufacturing process of the liquid crystal display device can be simplified.
In this embodiment, the liquid crystal display device can be switched between a wide viewing angle mode and a full narrow viewing angle mode by controlling a voltage signal applied to the viewing angle control electrode 306.
In the first viewing angle mode (i.e., wide viewing angle mode when the liquid crystal molecules are positive liquid crystal molecules), as shown in fig. 2, a voltage of 0V is applied to the viewing angle control electrode 306, an alternating voltage is applied to both the first pixel electrode 106a and the second pixel electrode 106b, and a voltage of 0V is applied to the common electrode 104. At this time, the voltage of the viewing angle control electrode 306 is 0V, the liquid crystal molecules of the liquid crystal layer 50 rotate in the horizontal direction only under the effect of the electrode electric field of the pixel electrode and the common electrode 104, no tilting occurs, the tilt angle is kept almost unchanged, and the liquid crystal display device realizes normal wide viewing angle display. It can be understood that in the wide viewing angle mode, the voltage applied to the common electrode 104 and the viewing angle control electrode 306 may also be a dc voltage or an ac voltage other than 0V, as long as the voltage difference between the common electrode 104 and the viewing angle control electrode 306 is less than a predetermined value (e.g., 1V), and generally, the same Vcom voltage is applied to the common electrode 104 and the viewing angle control electrode 306.
In the second viewing angle mode (i.e., the full narrow viewing angle mode when the liquid crystal molecules are positive liquid crystal molecules), as shown in fig. 3, a voltage is applied to the viewing angle control electrode 306, and a voltage of 0V is applied to the common electrode 104, and even if there is a voltage of one offset value between the viewing angle control electrode 306 and the common electrode 104, an ac voltage is applied to both the first pixel electrode 106a and the second pixel electrode 106 b. At this time, a voltage difference greater than or equal to a predetermined value exists between the viewing angle control electrode 306 and the common electrode 104, and since the extending directions of the first pixel electrode 106a and the second pixel electrode 106b are different, in the region corresponding to the first pixel electrode 106a, the liquid crystal molecules tilt at an angle, and in the region corresponding to the second pixel electrode 106b, the liquid crystal molecules tilt at another angle, so that left and right light leakage and up and down light leakage can be formed at the same time. Thus, the liquid crystal display device can realize full narrow viewing angle display. It is understood that in the full narrow viewing angle mode, the voltage applied to the common electrode 104 may also be a dc voltage or an ac voltage other than 0V, as long as the voltage difference between the common electrode 104 and the viewing angle control electrode 306 is greater than or equal to a predetermined value (e.g., 1V), and in general, a Vcom voltage is applied to the common electrode 104.
The liquid crystal display device of the present invention has a good narrow viewing angle display effect, and please refer to tables 1-4 below.
The liquid crystal layer 50 is made of positive IPS (In-Plane Switching) liquid crystal, the angle between the extending direction of the first electrode strips and the transverse direction is-10 °, the angle between the extending direction of the second electrode strips and the transverse direction is-80 ° (i.e., -10 ° with the longitudinal direction), and when the liquid crystal alignment direction is-45 °, the narrow viewing angle image effect is as shown In table 1 (unit °).
The liquid crystal layer 50 is made of positive IPS (In-Plane Switching) liquid crystal, the angle between the extending direction of the first electrode strips and the transverse direction is-10 °, the angle between the extending direction of the second electrode strips and the transverse direction is-100 ° (i.e., the angle between the extending direction of the second electrode strips and the transverse direction is 10 °), and when the liquid crystal alignment direction is-55 °, the narrow viewing angle image effect is as shown In table 2 (unit °).
The liquid crystal layer 50 is made of positive IPS (In-Plane Switching) liquid crystal, the angle between the extending direction of the first electrode strips and the transverse direction is 0 °, the angle between the extending direction of the second electrode strips and the transverse direction is-100 ° (i.e., the angle between the extending direction of the second electrode strips and the transverse direction is 10 °), and when the liquid crystal alignment direction is-55 °, the narrow viewing angle image effect is as shown In table 3 (unit °).
The liquid crystal layer 50 is a Twisted Nematic (TN) liquid crystal, an angle between the extending direction of the first electrode stripes and the transverse direction is 10 °, an angle between the extending direction of the second electrode stripes and the transverse direction is-100 ° (i.e., an angle between the extending direction of the second electrode stripes and the longitudinal direction is 10 °), and when the liquid crystal alignment direction is-55 °, the narrow viewing angle image effect is as shown in table 4 (unit °).
TABLE 1
Figure BDA0002229122030000071
TABLE 2
Figure BDA0002229122030000072
TABLE 3
Figure BDA0002229122030000073
TABLE 4
Figure BDA0002229122030000074
According to the liquid crystal display device, the pixel electrodes comprise the first pixel electrode and the second pixel electrode which are different in extending direction, liquid crystal only needs to be aligned in a single direction, different voltages are applied to the viewing angle control electrode, the liquid crystal display device can be switched between a wide viewing angle and a full-narrow viewing angle, various requirements of users can be met, and the display effect is good.
Second embodiment
As shown in fig. 4, the lcd device according to the second embodiment of the present invention has substantially the same structure as the lcd device according to the first embodiment, except that in this embodiment, each pixel unit P is provided with a first pixel electrode 106a or a second pixel electrode 106b, and a part of the pixel units P are provided with the first pixel electrodes 106a and a part of the pixel units P are provided with the second pixel electrodes 106 b.
In this embodiment, the first pixel electrode 106a is disposed in the pixel unit of the nth row, and the pixel unit of the (N + 1) th row is the second pixel electrode 106b, that is, the first pixel electrode 106a and the second pixel electrode 106b are alternately disposed in rows, where N is a positive integer greater than or equal to 1. It is understood that the pixel unit of the nth column may be the first pixel electrode 106a, and the pixel unit of the (N + 1) th column may be the second pixel electrode 106b, that is, the first pixel electrode 106a and the second pixel electrode 106b are alternately arranged in a column. It is understood that the first pixel electrodes 106a and the second pixel electrodes 106b may also be disposed alternately, that is, the periphery of each first pixel electrode 106a is the second pixel electrode 106b, and the periphery of each second pixel electrode 106b is the first pixel electrode 106 a. It is to be understood that one second pixel electrode 106b may be disposed to be spaced apart by two or more first pixel electrodes 106 a. That is, the first pixel electrode 106a and the second pixel electrode 106b may be staggered, may be staggered uniformly, or may be staggered non-uniformly in the whole display area.
The structure of the liquid crystal display device of this embodiment is substantially the same as the other structures of the liquid crystal display device of the first embodiment, and is not described herein again.
Third embodiment
As shown in fig. 5, 6 and 7, the liquid crystal display device according to the third embodiment of the present invention includes an array substrate 10, a color filter substrate 30 disposed opposite to the array substrate 10, and a liquid crystal layer 50 disposed between the thin film transistor array substrate 10 and the color filter substrate 30.
A plurality of pixel units P are defined on the array substrate 10 by the scan lines 100 and the data lines 101. The array substrate 10 includes a first substrate 102, a thin film transistor (not shown), a common electrode 104, and a pixel electrode, where one pixel electrode and one thin film transistor are disposed in each pixel unit. The pixel electrodes in some pixel units P include a first pixel electrode 106a and a second pixel electrode 106b, the first pixel electrode 106a includes a first electrode stripe, and the second pixel electrode 106b includes a second electrode stripe. The extending directions of the first electrode strips and the second electrode strips are different. Specifically, the thin film transistor includes a gate electrode, a source electrode and a drain electrode, wherein the gate electrode is electrically connected to the corresponding scan line 100, the gate electrode may be independently disposed or may be a part of the scan line 100, the source electrode is electrically connected to the corresponding data line 101, and the drain electrode is electrically connected to the corresponding pixel electrode. In this embodiment, the common electrode 104 and the pixel electrode are located in different layers, an insulating layer 107 is interposed between the common electrode 104 and the pixel electrode, the pixel electrode is disposed above the common electrode 104, the pixel electrode is a slit-shaped electrode, and the common electrode 104 is a planar electrode covering the entire surface of the first substrate 102, but the invention is not limited thereto.
In this embodiment, an included angle between the first electrode strips and the second electrode strips may be 30 ° to 90 °. Preferably, the included angle between the first electrode strip and the transverse direction is-20 degrees to-20 degrees, and the included angle between the second electrode strip and the longitudinal direction is-20 degrees to-20 degrees. Through designing the extending direction of the pixel electrode like this, the display effect is better when can make narrow visual angle mode, has good peep-proof effect.
In this embodiment, the area ratio of the first pixel electrode 106a to the second pixel electrode 106b is 1:1 to 0.5. Through the design of the area ratio, the display effect is better in a narrow visual angle mode, and the peep-proof effect is good.
In this embodiment, four adjacent pixel units P form a pixel unit group, each pixel unit group includes one pixel unit P, and the pixel electrodes in the pixel unit group include a first pixel electrode 106a and a second pixel electrode 106 b. The other three pixel units P in each pixel unit group are respectively arranged corresponding to R, G, B color resistors.
The color filter substrate 30 includes a second substrate 302 and a color resist layer 304 disposed on the second substrate 302. The color resist layer 304 is, for example, R, G, B color resist. The color resist layer 304 is provided on the surface of the second substrate 302 on the side closer to the liquid crystal layer 50. A Black Matrix (BM) may be disposed between color resists of the color resist layer 304 to prevent light of different colors from being mixed. The color filter substrate 30 further includes a viewing angle control electrode 308. The viewing angle control electrode 308 is disposed on a surface of the second substrate 302 on which the color resist 304 is disposed, and the viewing angle control electrode 308 is disposed corresponding to a pixel unit P region including the first pixel electrode 106a and the second pixel electrode 106 b. The color filter substrate 30 further includes a protection layer 309, and the protection layer 309 is disposed on the color resist layer 304 and the surface of the viewing angle control electrode 308 close to the liquid crystal layer 50. In this embodiment, the viewing angle control electrode 308 is made of a transparent conductive material, such as an ITO (indium tin oxide) material.
In this embodiment, the liquid crystal molecules in the liquid crystal layer 50 are positive liquid crystal molecules, and the positive liquid crystal molecules have the advantage of fast response. In an initial state (i.e., in a state where no voltage is applied to the liquid crystal display device), the positive liquid crystal molecules in the liquid crystal layer 50 are in a lying posture substantially parallel to the array substrate 10 and the color filter substrate 30, i.e., the long axis direction of the positive liquid crystal molecules is substantially parallel to the surfaces of the array substrate 10 and the color filter substrate 30. However, in practical applications, a smaller initial pretilt angle may be provided between the positive liquid crystal molecules in the liquid crystal layer 50 and the array substrate 10 and the color filter substrate 30, and the range of the initial pretilt angle may be less than or equal to 10 degrees, that is: the pretilt angle is more than or equal to 0 degree and less than or equal to 10 degrees. Of course, the liquid crystal molecules in the liquid crystal layer 50 may also be negative liquid crystal molecules.
In this embodiment, in the entire liquid crystal display device, the initial alignment directions of the liquid crystal layer 50 are the same, and the alignment directions of the array substrate 10 and the color filter substrate 30 are parallel. More specifically, the angle between the alignment direction of the liquid crystal layer 50 and the first electrode bars is half of the angle between the first electrode bars and the second electrode bars ± 5 ° (as shown by L2 in fig. 5, the alignment direction of an embodiment). The initial alignment directions of the liquid crystal layer 50 are designed to be the same, so that the alignment process can be simplified and the manufacturing process of the liquid crystal display device can be simplified.
In this embodiment, the liquid crystal display device can be switched between the wide viewing angle mode and the full narrow viewing angle mode by controlling the voltage signal applied to the viewing angle control electrode 306, and the switching process is the same as that of the first embodiment, and is not described herein again.
It is to be understood that, similarly to the second embodiment, the first pixel electrode 106a and the second pixel electrode 106b are not disposed in the same pixel unit P, but the first pixel electrode 106a is disposed in a part of the pixel unit P and the second pixel electrode 106b is disposed in a part of the pixel unit P.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (6)

1. A liquid crystal display device comprises an array substrate (10), a color film substrate (30) arranged opposite to the array substrate (10), and a liquid crystal layer (50) arranged between the array substrate (10) and the color film substrate (30), wherein a plurality of pixel units (P) are defined and formed on the array substrate (10) by scanning lines (100) and data lines (101), the array substrate (10) comprises a common electrode (104) and pixel electrodes, one pixel electrode is arranged in each pixel unit (P), the liquid crystal display device is characterized in that the pixel electrodes comprise a first pixel electrode (106a) and a second pixel electrode (106b), the first pixel electrode (106a) comprises a first electrode strip, the second pixel electrode (106b) comprises a second electrode strip, the extending directions of the first electrode strip and the second electrode strip are different, the color film substrate (30) comprises a viewing angle control electrode (306), the visual angle control electrode (306) is arranged corresponding to the first pixel electrode (106a) and the second pixel electrode (106b), the included angle between the first electrode strip and the second electrode strip is 30-90 degrees, the included angle between the first electrode strip and the transverse direction is-20 degrees, the included angle between the second electrode strip and the longitudinal direction is-20 degrees, in the whole liquid crystal display device, the initial alignment direction of the liquid crystal layer (50) is the same, and the included angle between the alignment direction of the liquid crystal layer (50) and the first electrode strip is half of the included angle between the first electrode strip and the second electrode strip +/-5 degrees.
2. A liquid crystal display device as claimed in claim 1, characterized in that one of the first pixel electrode (106a) and one of the second pixel electrode (106b) are provided in each of the pixel cells (P); or, each pixel unit (P) is provided with one first pixel electrode (106a) or one second pixel electrode (106b), and part of the pixel units (P) are provided with the first pixel electrodes (106a) and part of the pixel units (P) are provided with the second pixel electrodes (106 b); or, the pixel electrodes in part of the pixel units (P) comprise the first pixel electrode (106a) and the second pixel electrode (106 b); alternatively, the first pixel electrode (106a) or the second pixel electrode (106b) is disposed only in a part of the pixel unit (P).
3. The lcd device of claim 2, wherein when one of the first pixel electrode (106a) and the second pixel electrode (106b) is disposed in each of the pixel units (P), and the first pixel electrode (106a) is disposed in a part of the pixel units (P), and the second pixel electrode (106b) is disposed in a part of the pixel units (P), the first pixel electrode (106a) and the second pixel electrode (106b) are alternately disposed in rows; or the first pixel electrode (106a) and the second pixel electrode (106b) are alternately arranged in a row; alternatively, the first pixel electrode (106a) and the second pixel electrode (106b) are alternately arranged.
4. The lcd device of claim 2, wherein when the first pixel electrode (106a) and the second pixel electrode (106b) are disposed in a portion of the pixel cells (P), four adjacent pixel cells (P) form a pixel cell group, and the pixel electrode in one pixel cell (P) in each pixel cell group comprises the first pixel electrode (106a) and the second pixel electrode (106 b).
5. The lcd device of claim 1, wherein the alignment directions of the array substrate (10) and the color filter substrate (30) are parallel.
6. The liquid crystal display device of claim 1, wherein an area ratio of the first pixel electrode (106a) to the second pixel electrode (106b) is 1:1 to 0.5.
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