CN111142294A - Pixel electrode structure and array substrate - Google Patents
Pixel electrode structure and array substrate Download PDFInfo
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- CN111142294A CN111142294A CN202010107436.6A CN202010107436A CN111142294A CN 111142294 A CN111142294 A CN 111142294A CN 202010107436 A CN202010107436 A CN 202010107436A CN 111142294 A CN111142294 A CN 111142294A
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- 239000000758 substrate Substances 0.000 title abstract description 10
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 70
- 238000000926 separation method Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
- 230000035515 penetration Effects 0.000 description 9
- 230000000007 visual effect Effects 0.000 description 5
- 230000005684 electric field Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005034 decoration Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
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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
- G02F1/133—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
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Geometry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Liquid Crystal (AREA)
Abstract
The invention provides a pixel electrode structure and an array substrate. The array substrate comprises a pixel electrode structure, wherein the pixel electrode structure comprises an electrode frame, a first main electrode, a second main electrode and a plurality of branch electrodes; the first main electrode and the second main electrode are arranged in a pixel area formed by the electrode frame in a surrounding mode, two ends of the first main electrode and the second main electrode are electrically connected with the electrode frame respectively, and the first main electrode and the second main electrode are intersected to form a plurality of liquid crystal alignment areas; one end of each branch electrode is electrically connected with the electrode frame, the other end of each branch electrode is arranged away from the first main electrode and the second main electrode, and the branch electrodes distributed in the same liquid crystal alignment area are parallel to each other. The invention enables the liquid crystals at the junction of the transparent branch electrodes and the main electrode in different directions to fall to two sides without mutual interference, avoids liquid crystal interlacing and realizes the technical effects of no cross dark stripes and color cast.
Description
Technical Field
The invention relates to the technical field of display, in particular to a pixel electrode structure and an array substrate.
Background
With the development and progress of technology, liquid crystal displays are the most widely used displays in the market, especially widely used in liquid crystal televisions.
Currently, a liquid crystal display panel has Data Lines (DL), Scan Lines (SL), thin film transistors, and pixel electrodes. In order to improve color shift at large viewing angles, pixels are designed to have a plurality of alignment regions (domains). Multi-domain alignment liquid crystal displays (MVA LCDs) are widely used in large-sized liquid crystal displays and television applications by virtue of high contrast and wide viewing angle.
For the display effect, as shown in fig. 1, a main pixel structure 90 is available on the market, which is a grid-shaped pixel along four directions, i.e. the transparent branch electrodes of the four alignment regions face to four directions, and is a "meter" shaped pattern, and after applying a voltage, the liquid crystal falls down along the transparent branch electrodes. In order to prevent the liquid crystal in two adjacent alignment regions from falling down and causing inversion abnormality, a cross-shaped wide main branch 91(trunk) is disposed at the intersection of the alignment regions, and branch stems 92 are disposed radially around the intersection of the main branch 91. The pixel design can uniformly invert liquid crystal to four different directions, the brightness observed in each direction in a visual angle is uniform, the grid direction generally has a 45-degree difference with the upper and lower polaroids, the theoretical penetration rate can reach the highest, and therefore the penetration rate and the visual angle of the pixel design can reach better levels.
However, at the junction between the transparent branch electrode and the main electrode in different directions, the liquid crystal cannot be ideally inverted to two sides, and a large amount of liquid crystal is often staggered to form a frame, so that the deflection angle of the liquid crystal greatly deviates from 45 degrees, and a cross dark stripe appears in the middle of a pixel. When the liquid crystal molecules are arranged and oriented and viewed at different angles, color cast is generated due to different transmittances of the liquid crystal molecules, the color cast is generated at a large viewing angle, and the problem of the color cast is more serious when the size is larger; and the dark stripe width is wider, and the pixel area penetration rate around the dark stripe is lower than that of other normal pixel areas, finally resulting in the pixel penetration rate being reduced.
Disclosure of Invention
The invention aims to provide a pixel electrode structure and an array substrate, and aims to solve the technical problems that liquid crystals at the junction of transparent branch electrodes and main electrodes in different directions in the conventional'm' -shaped pixel structure cannot be ideally inverted to two sides, a large amount of liquid crystals are staggered and have deflection angles deviating from 45 degrees, and a 'cross' dark stripe appears in the middle of a pixel and color cast occurs.
In order to achieve the above object, the present invention provides a pixel electrode structure, which includes an electrode frame, a first main electrode, a second main electrode, and a plurality of branch electrodes; specifically, the electrode frame surrounds to form a pixel region, the first trunk electrode is arranged in the pixel region, and two ends of the first trunk electrode are respectively and electrically connected with the electrode frame; the second main electrode is arranged in the pixel area, two ends of the second main electrode are respectively electrically connected with the electrode frame, and the second main electrode and the first main electrode are intersected to form a plurality of liquid crystal alignment areas; one end of each branch electrode is electrically connected with the electrode frame, the other end of each branch electrode is arranged away from the first main electrode and the second main electrode, and the branch electrodes distributed in the same liquid crystal alignment area are parallel to each other.
Furthermore, the first main electrode and the second main electrode vertically intersect to form four liquid crystal alignment regions, and each branch electrode in the four liquid crystal alignment regions is symmetrically arranged relative to the first main electrode and the second main electrode.
Further, the overlooking projection of the electrode frame is in an axisymmetric pattern.
Further, the first trunk electrode and/or the second trunk electrode are strip-shaped electrodes with equal width at each position.
Furthermore, the included angle between each branch electrode and the corresponding electrode frame is 40-50 degrees.
Furthermore, in the same liquid crystal alignment region, the spacing distances between any two adjacent branch electrodes are equal.
Further, the spacing distance between two adjacent branch electrodes is 3um-6 um.
Further, in the same liquid crystal alignment region, the widths of the branch electrodes are equal to each other.
Further, the plurality of branch electrodes are arranged in a radial shape.
In order to achieve the above object, the present invention further provides a display panel including the pixel electrode structure described above.
The invention has the technical effects that one end of each branch electrode in the same liquid crystal alignment area is electrically connected with the electrode frame, and the other end of each branch electrode is arranged away from the first main electrode and the second main electrode, so that liquid crystals at the junction of the transparent branch electrodes and the main electrodes in different directions can fall to two sides without mutual interference, the phenomena of liquid crystal staggering and 45-degree deviation of deflection angle are avoided, and the technical effects of no cross dark lines and color cast generation after liquid crystal molecules are arranged and oriented are realized.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings used in the description of the embodiments will be briefly introduced below. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic plan view of a conventional pixel structure;
fig. 2 is a schematic plan view of a pixel structure according to an embodiment of the invention.
Some of the symbols in the drawings are as follows:
1. an electrode frame 2, a first trunk electrode 3, a second trunk electrode,
4. a branch electrode 10, a pixel electrode structure 11 and a liquid crystal alignment area.
Detailed Description
The preferred embodiments of the present invention will be described below with reference to the accompanying drawings for illustrating the invention and enabling those skilled in the art to fully describe the technical contents of the present invention so that the technical contents of the present invention can be more clearly and easily understood. The present invention may, however, be embodied in many different forms of embodiments and the scope of the present invention should not be construed as limited to the embodiments set forth herein.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; the connection can be mechanical connection or electrical connection; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following description of the various embodiments refers to the accompanying drawings that illustrate specific embodiments in which the invention may be practiced. Directional terms mentioned in the present invention, such as [ upper ], [ lower ], [ front ], [ rear ], [ left ], [ right ], [ inner ], [ outer ], [ side ], [ lateral ] and the like, refer to the directions of the attached drawings only. Accordingly, the directional terms used are used for explanation and understanding of the present invention, and are not used for limiting the present invention. In the drawings, elements having similar structures are denoted by the same reference numerals.
In the drawings, the thickness of layers and regions are exaggerated for clarity. For example, the thicknesses and sizes of elements in the drawings are arbitrarily shown for convenience of description, and thus, the described technical scope is not limited by the drawings.
As shown in fig. 2, the embodiment of the invention provides a pixel electrode structure 10, which includes an electrode frame 1, a first main electrode 2, a second main electrode 3, and a plurality of branch electrodes 4.
Specifically, the electrode frame 1 surrounds to form a pixel region, the first trunk electrode 2 is disposed in the pixel region, and two ends of the first trunk electrode are electrically connected to the electrode frame 1 respectively; the second main electrode 3 is arranged in the pixel region, two ends of the second main electrode are respectively electrically connected with the electrode frame 1, and the second main electrode intersects with the first main electrode 2 to form a plurality of liquid crystal alignment regions 11; one end of each branch electrode 4 is electrically connected with the electrode frame 1, the other end of each branch electrode is arranged away from the first main electrode 2 and the second main electrode 3, and the branch electrodes 4 distributed in the same liquid crystal alignment region 11 are parallel to each other.
As shown in fig. 2, in the pixel electrode structure 10 provided in this embodiment, one end of each of the branch electrodes 4 in the same liquid crystal alignment region 11 is electrically connected to the electrode frame 1, and the other end of each of the branch electrodes 4 is separately disposed from the first main electrode 2 and the second main electrode 3, the branch electrodes 4 in four directions are not connected to each other, and there is a certain interval, so that the whole pixel is connected to and conducted through the peripheral electrode frame 1, and meanwhile, the lateral electric field force of the first main electrode 2 and the second main electrode 3 is also prevented from being insufficient, and the middle first main electrode 2 and the second main electrode 3 can provide sufficient lateral electric field force, so that the liquid crystal can be quickly deflected to an ideal angle, thereby reducing the "cross" dark fringe phenomenon and increasing the penetration rate of the pixel. And at the junction of the transparent branch electrode 4 and the main electrode in different directions, the liquid crystal can be inverted to two sides without mutual interference, thereby avoiding the phenomenon that the liquid crystal is staggered and the deflection angle deviates 45 degrees, improving the cross dark line in the middle of the pixel, improving the penetration rate of the pixel and further improving the color cast.
In this embodiment, the first main electrode 2 and the second main electrode 3 are perpendicularly intersected to form four liquid crystal alignment regions 11, and the branch electrodes 4 in the four liquid crystal alignment regions 11 are symmetrically arranged relative to the first main electrode 2 and the second main electrode 3, so that the liquid crystal alignment regions 11 on two sides of the first main electrode 2 and the second main electrode 3 can be viewed in different directions, the brightness observed in each direction in a viewing angle is uniform, and the large-viewing-angle color cast is improved.
Four liquid crystal alignment regions 11 formed by the first main electrode 2 and the second main electrode 3 intersecting perpendicularly are grid-shaped pixels along four directions, that is, the branch electrodes 4 of the four alignment regions face four directions, and after a voltage is applied, liquid crystals in the same liquid crystal alignment region 11 fall down along the direction of the branch electrodes 4. And the other end of the branch electrode 4 is separated from the first main electrode 2 and the second main electrode 3, so that the phenomenon that the liquid crystals in two adjacent alignment areas are influenced by each other when falling is prevented, the liquid crystal alignment is not influenced by the first main electrode 2 and the second main electrode 3, the liquid crystals can be uniformly inverted to four different directions, the brightness observed in each direction in a visual angle is uniform, and the penetration rate and the visual angle can reach better levels.
In this embodiment, the top-view projection of the electrode frame 1 is an axisymmetric pattern, preferably a rectangle, so that the liquid crystal alignment regions 11 can be symmetrically disposed, and the electrode structure can be conveniently manufactured, and the areas of the liquid crystal alignment regions 11 are the same, so that the brightness observed in each direction viewing angle is uniform.
In this embodiment, the first main electrode 2 and/or the second main electrode 3 are strip-shaped electrodes with equal width at each position.
In this embodiment, the included angle between each branch electrode 4 and the corresponding electrode frame 1 is 40 degrees to 50 degrees, preferably 45 degrees. The extending direction of each branch electrode 4 is generally 45 degrees different from that of the upper and lower polaroids, and the theoretical penetration rate can reach the highest, so that the penetration rate and the visual angle of the design can reach better levels. Of course, in other embodiments of the present invention, the branch angle may also be other reasonable values (e.g., other reasonable values in [30 degrees, 60 degrees ], etc.), and the present invention is not limited thereto.
In this embodiment, in the same liquid crystal alignment region 11, the separation distance between any two adjacent branch electrodes 4 is equal, so that the manufacturing is facilitated, and the electric field force of each branch electrode 4 is the same, so that the deflection angles of the liquid crystal are the same.
In this embodiment, the distance between two adjacent branch electrodes 4 is 3um-6um, and preferably 5um, can realize the narrow frame, avoids simultaneously the crossover produces liquid crystal and arranges the direction of charge to disturb between the branch electrode 4.
In order to solve the problem of color shift at a large viewing angle of the conventional liquid crystal display panel, the branch electrodes 4 in the pixel electrode structure 10 provided in this embodiment are also arranged at unequal intervals. That is, in each liquid crystal alignment region, the distance between adjacent branch electrodes 4 gradually decreases in the direction away from the central region of the liquid crystal alignment region 11.
In the present embodiment, the widths of the plurality of branch electrodes 4 are equal to each other in the same liquid crystal alignment region 11, which is convenient for manufacturing and the electric field force of each branch electrode 4 is the same, so that the deflection angles of the liquid crystal are the same.
In this embodiment, the plurality of branch electrodes 4 are arranged radially, and the pixel design can uniformly invert the liquid crystal to four different directions, so that the brightness observed in each direction at the viewing angle is uniform.
Based on the same inventive concept, the disclosed embodiments provide an array substrate including the pixel electrode structure 10 provided by the above embodiments. The pixel electrode structure 10 may be applied to a main pixel region and may also be applied to a sub-pixel region, which is the prior art and is not described herein again.
The working principle of the array substrate provided in this embodiment is consistent with that of the pixel electrode structure 10, and the specific structural relationship and working principle refer to that of the pixel electrode structure 10, in this embodiment, one end of each branch electrode 4 of the same liquid crystal alignment region 11 in the pixel electrode structure 10 is electrically connected to the electrode frame 1, and the other end is separately arranged from the first trunk electrode 2 and the second trunk electrode 3, so that at the boundary between the transparent branch electrodes 4 and the trunk electrodes in different directions, the liquid crystals can fall to two sides without mutual interference, the phenomenon that the liquid crystals are staggered and the deflection angle deviates from 45 degrees is avoided, the technical effect that "cross" dark streaks cannot appear and color cast occurs after the liquid crystal molecules are aligned is realized, and the color cast is improved.
The array substrate in the embodiment of the disclosure can be used for manufacturing a display panel, and the display panel can be any product or component with a display function, such as a mobile phone, a tablet computer, a television, a display, a notebook computer, a digital photo frame, a navigator and the like.
The technical effect of the present invention is to provide a pixel electrode structure 10 and an array substrate, wherein one end of each branch electrode 4 in the same liquid crystal alignment region 11 is electrically connected to the electrode frame 1, and the other end is separated from the first main electrode 2 and the second main electrode 3, so that at the junction between the transparent branch electrodes 4 and the main electrodes in different directions, the liquid crystal can fall to both sides without mutual interference, thereby avoiding the phenomenon of liquid crystal crossing and deflection angle deviation of 45 degrees, realizing the technical effect that 'cross' dark stripes and color cast are not generated after liquid crystal molecules are aligned, and improving color cast.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A pixel electrode structure, comprising:
an electrode frame surrounding and forming a pixel region;
the first main electrode is arranged in the pixel area, and two ends of the first main electrode are respectively electrically connected with the electrode frame;
the second main electrode is arranged in the pixel area, two ends of the second main electrode are respectively electrically connected with the electrode frame, and the second main electrode and the first main electrode are intersected to form a plurality of liquid crystal alignment areas; and
and one end of each branch electrode is electrically connected with the electrode frame, the other end of each branch electrode is arranged away from the first main electrode and the second main electrode, and the branch electrodes distributed in the same liquid crystal alignment area are parallel to each other.
2. The pixel electrode structure of claim 1, wherein the first and second main electrodes perpendicularly intersect to form four liquid crystal alignment regions, and each of the branch electrodes in the four liquid crystal alignment regions is symmetrically arranged with respect to the first and second main electrodes.
3. The pixel electrode structure according to claim 1, wherein the electrode frame has an axisymmetric pattern in a top view projection.
4. The pixel electrode structure according to claim 1, wherein the first trunk electrode and/or the second trunk electrode is a strip-shaped electrode having an equal width at each position.
5. The pixel electrode structure according to claim 1, wherein an included angle between each of the stem electrodes and the corresponding electrode frame is 40 to 50 degrees.
6. The pixel electrode structure of claim 1, wherein the separation distance between any two adjacent branch electrodes is equal in the same liquid crystal alignment region.
7. The pixel electrode structure of claim 1, wherein the distance between two adjacent branch electrodes is 3-6 um.
8. The pixel electrode structure of claim 1, wherein the widths of the branch electrodes are equal to each other in the same liquid crystal alignment region.
9. The pixel electrode structure according to claim 1, wherein the plurality of stem electrodes are radially arranged.
10. A display panel comprising a pixel electrode structure according to any one of claims 1-9.
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| CN202010107436.6A CN111142294B (en) | 2020-02-21 | 2020-02-21 | Pixel electrode structure and array substrate |
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| CN202010107436.6A CN111142294B (en) | 2020-02-21 | 2020-02-21 | Pixel electrode structure and array substrate |
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