CN109212839B - Array substrate, display device and control method of display device - Google Patents
Array substrate, display device and control method of display device Download PDFInfo
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- CN109212839B CN109212839B CN201811417955.1A CN201811417955A CN109212839B CN 109212839 B CN109212839 B CN 109212839B CN 201811417955 A CN201811417955 A CN 201811417955A CN 109212839 B CN109212839 B CN 109212839B
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- 239000000758 substrate Substances 0.000 title claims abstract description 77
- 238000000034 method Methods 0.000 title claims abstract description 15
- 239000002184 metal Substances 0.000 claims abstract description 65
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 56
- 230000005684 electric field Effects 0.000 claims abstract description 30
- 239000010409 thin film Substances 0.000 claims abstract description 23
- 230000002093 peripheral effect Effects 0.000 claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims description 3
- 239000010408 film Substances 0.000 abstract description 18
- 239000010410 layer Substances 0.000 description 62
- 239000004065 semiconductor Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000011229 interlayer Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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- 239000007769 metal material Substances 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/13378—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation
- G02F1/133784—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers by treatment of the surface, e.g. embossing, rubbing or light irradiation by rubbing
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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
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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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
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133514—Colour filters
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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
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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
- G02F1/136—Liquid crystal cells structurally associated with a semi-conducting layer or substrate, e.g. cells forming part of an integrated circuit
- G02F1/1362—Active matrix addressed cells
- G02F1/136227—Through-hole connection of the pixel electrode to the active element through an insulation layer
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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
- G02F1/137—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering
- G02F1/139—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent
- G02F1/1396—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 characterised by the electro-optical or magneto-optical effect, e.g. field-induced phase transition, orientation effect, guest-host interaction or dynamic scattering based on orientation effects in which the liquid crystal remains transparent the liquid crystal being selectively controlled between a twisted state and a non-twisted state, e.g. TN-LC cell
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- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mathematical Physics (AREA)
- Liquid Crystal (AREA)
- Engineering & Computer Science (AREA)
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Abstract
An array substrate, a display device and a control method of the display device are provided, the array substrate comprises a plurality of pixel units, each pixel unit is internally provided with a thin film transistor, a metal common electrode, a pixel electrode and an auxiliary electrode, the pixel electrode is connected with a source electrode or a drain electrode of the corresponding thin film transistor through a first through hole, the metal common electrode, the pixel electrode and the auxiliary electrode are sequentially arranged from bottom to top and are mutually insulated, the pixel electrode is provided with a part corresponding to an opening area of the array substrate, the metal common electrode and the auxiliary electrode are correspondingly arranged on the peripheral side of the opening area and are respectively provided with a part corresponding to the position of the first through hole, and the auxiliary electrode in each pixel unit is connected to the same signal line so as to form an auxiliary electric field for driving liquid crystal with the common electrode on the color filter substrate. The invention can effectively solve the problem that the image quality is influenced by insufficient rubbing alignment caused by the height difference of the film layer around the opening area in the rubbing alignment process of the alignment film.
Description
Technical Field
The invention relates to the technical field of display, in particular to an array substrate, a display device and a control method of the display device.
Background
With the rapid development of light weight, thinness and miniaturization of electronic products, Liquid Crystal Displays (LCDs) are used as Display panels in most of various portable electronic products, and are important components in video cameras, notebook computers, desktop computers, smart televisions, mobile terminals or personal digital processors.
The liquid crystal display displays pictures by utilizing the special physical and photoelectric characteristics of liquid crystal, controls different states of liquid crystal molecules by voltage, and enables light of the backlight module to penetrate through the liquid crystal layer in a required polarization direction, thereby presenting pictures with different colors and patterns. In order to arrange the liquid crystal molecules regularly, alignment films are added on the upper and lower surfaces of the liquid crystal layer, and the liquid crystal molecules are arranged along the alignment films and form a certain angle with the substrate. When a voltage is applied to the liquid crystal layer, the liquid crystal molecules rotate under the action of an electric field, and photoelectric characteristics are generated. If no alignment film is present, the liquid crystal molecules will be randomly arranged in the liquid crystal layer, and when a voltage is applied to the liquid crystal layer, the standing directions of the liquid crystal molecules are different, and light passing through the opening area is scattered and diffracted to generate a light leakage phenomenon, so that a picture cannot be normally displayed. However, in the Rubbing process (Rubbing) for forming the alignment film, insufficient Rubbing of a portion of the alignment film due to a height difference of the surface of the alignment film is likely to occur, and also, the liquid crystal corresponding to the portion of the alignment film is randomly arranged to cause light leakage, thereby affecting image quality.
Referring to fig. 1 and 2, a conventional array substrate includes a substrate 10, a plurality of thin film transistors 11 disposed on the substrate 10, an insulating layer 17 covering the thin film transistors 11, and a pixel electrode 13 disposed on the insulating layer 17, the insulating layer 17 having a through hole 171, each thin film transistor 11 including a gate 111, a gate insulating layer 14, a semiconductor channel layer, a source 112, and a drain 113, the gate 111 being disposed on the substrate 10, a metal common electrode 12 being disposed on the same layer of the gate 111, the gate insulating layer 14 covering the substrate 10, the gate 111, and the metal common electrode 12, the semiconductor channel layer being disposed on the gate insulating layer 14 and directly above the gate 111, the source 112 and the drain 113 being disposed on the semiconductor channel layer and on both sides of the semiconductor channel layer, the drain 113 being disposed below the through hole 171, and the pixel electrode 13 being connected to the drain 113 through the through hole 171, the pixel electrode 13 has a portion 131 corresponding to the opening region 101 (light-transmitting region) of the array substrate, and the metal common electrode 12 is disposed on the periphery of the opening region 101, so that a height difference occurs between the opening region 101 and the periphery of the opening region 101 of the array substrate due to the difference in the number of layers, and particularly, a thickness difference between two layers of metal layers, that is, a thickness difference between the layer where the drain electrode 113 is located and the layer where the metal common electrode 12 is located, exists between the position where the through hole 171 is located and the opening region 101. In the process of forming the alignment film, the rubbing alignment around the opening region 101 is insufficient due to the height difference of the film layer around the opening region 101, and the liquid crystal 18 corresponding to the position is randomly arranged to cause the light leakage phenomenon, thereby affecting the image quality.
Disclosure of Invention
The invention aims to provide an array substrate, a display device and a control method of the display device, which can effectively solve the problem that the image quality is influenced by insufficient rubbing alignment caused by the height difference of film layers around an opening area in the rubbing alignment process of an alignment film.
The invention provides an array substrate, which comprises a plurality of pixel units, wherein each pixel unit is internally provided with a thin film transistor, a metal common electrode, a pixel electrode and an auxiliary electrode, the pixel electrode is connected with a source electrode or a drain electrode of the corresponding thin film transistor through a first through hole, the metal common electrode, the pixel electrode and the auxiliary electrode are sequentially arranged from bottom to top and are mutually insulated, the pixel electrode is provided with a part corresponding to an opening area of the array substrate, the metal common electrode and the auxiliary electrode are correspondingly arranged on the peripheral side of the opening area and are respectively provided with a part corresponding to the position of the first through hole, and the auxiliary electrode in each pixel unit is connected to the same signal line to form an auxiliary electric field for driving liquid crystal with the common electrode on a color filter substrate.
Wherein the auxiliary electrode and the metal common electrode further have portions corresponding to positions of the data lines, respectively.
Wherein the auxiliary electrode and the portion of the metal common electrode corresponding to the position of the data line are located between the data line and the opening area.
Wherein the data line is arranged between two adjacent columns of pixel electrodes.
Wherein the auxiliary electrode overlaps with a projection of the metal common electrode.
The metal common electrode is formed on the layer where the grid electrode of the thin film transistor is located.
Wherein the auxiliary electrode is a metal electrode or a transparent electrode.
Wherein the width of the auxiliary electrode is smaller than that of the metal common electrode, and the auxiliary electrode is aligned with the edge of the metal common electrode far away from the opening area.
The application still provides a display device, display device includes color filter base plate, liquid crystal and as above the array substrate, the liquid crystal sets up color filter base plate with between the array substrate, color filter base plate is provided with common electrode.
The present application also provides a control method of a display device, applied to the display device as described above, including:
monitoring the display state of the display device;
when the display state of the display device is a dark state, an auxiliary voltage is input to an auxiliary electrode in the array substrate, and the auxiliary voltage is greater than or equal to the threshold voltage of the liquid crystal, so that the auxiliary electrode and a common electrode on the color filter substrate form an auxiliary electric field for driving the liquid crystal.
The invention relates to an array substrate, a display device and a control method of the display device, wherein a thin film transistor, a metal common electrode, a pixel electrode and an auxiliary electrode are arranged in each pixel unit, the pixel electrode is provided with a part corresponding to an opening area of the array substrate, the metal common electrode and the auxiliary electrode are correspondingly arranged on the peripheral side of the opening area and are respectively provided with a part corresponding to the position of a first through hole, the auxiliary electrode in each pixel unit is connected to the same signal line and is used for forming an auxiliary electric field for driving liquid crystal with the common electrode on a color filter substrate, thus, the auxiliary electrode and the common electrode on the peripheral side of the opening area are correspondingly arranged and are provided with parts corresponding to the positions of the first through holes, the auxiliary electrode can form an auxiliary electric field for driving the liquid crystal with the common electrode on the color filter substrate, the problem of disordered arrangement of the liquid crystal near the first through hole due to insufficient rubbing alignment is, thereby improving the light leakage phenomenon in the dark state and improving the image quality.
Drawings
Fig. 1 is a schematic wiring diagram of an array substrate in the prior art.
Fig. 2 is a schematic cross-sectional view of a display device of the prior art taken along line II-II of fig. 1.
Fig. 3 is a schematic wiring diagram of the array substrate according to an embodiment of the invention.
Fig. 4 is a schematic cross-sectional view of a display device along the line IV-IV shown in fig. 3 according to an embodiment of the present invention.
Fig. 5 is a graph illustrating transmittance-voltage curves of a display device displaying different color pictures according to the prior art.
FIG. 6 is a graph showing transmittance-voltage curves of a display device displaying different color pictures according to an embodiment of the present invention.
Detailed Description
To further explain 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 preferred embodiments.
Fig. 3 is a schematic wiring diagram of the array substrate according to an embodiment of the invention. Fig. 4 is a schematic cross-sectional view of a display device along the line IV-IV shown in fig. 3 according to an embodiment of the present invention. As shown in fig. 3 and 4, the array substrate of the invention includes a substrate 20, and a Gate line (Gate line)251 and a data line (data line)252 disposed on the substrate 20, a plurality of pixel units are defined between the Gate line 251 and the data line 252, a thin film transistor 21, a metal common electrode 22, a pixel electrode 23, and an auxiliary electrode 26 are disposed in each pixel unit, the thin film transistor 21 is not limited to an amorphous silicon (a-Si) thin film transistor or an oxide thin film transistor, the pixel electrode 23 has a portion 231 corresponding to an opening area (please refer to the opening area 101 in fig. 1) of the array substrate and is connected to a drain 213 of the corresponding thin film transistor 21 through a first via 271 in the non-opening area (in another embodiment, the pixel electrode 23 may also be connected to the source 212), the metal common electrode 22, the pixel electrode 23, and the auxiliary electrode 26 are sequentially disposed on the substrate 20 from bottom to top and are insulated from each other, the metal common electrode 22 and the auxiliary electrode 26 are disposed corresponding to the peripheral side of the opening area and have portions corresponding to the positions of the first through holes 271, respectively, in one embodiment, the metal common electrode 22 and the auxiliary electrode 26 are not limited to pass through the positions directly above and directly below the first through holes 271, respectively, and the auxiliary electrode 26 in each pixel unit is connected to the same signal line for forming an auxiliary electric field for driving the liquid crystal 28 with an entire surface-shaped common electrode (not shown) on the color filter substrate 30.
According to the structure of the array substrate of the embodiment of the invention, by arranging the auxiliary electrode 26 corresponding to the metal common electrode 22 at the peripheral side of the opening area and having the portion corresponding to the position of the first through hole 271, that is, by arranging the auxiliary electrode 26 at the position having the height difference of the film layer, for a TN (Twisted Nematic) liquid crystal panel, when the display state of the display device is a dark state, a vertical electric field for driving the liquid crystal 28 to twist is formed between the pixel electrode 23 and the common electrode on the color filter substrate 30, and at this time, an auxiliary voltage is input to the auxiliary electrode 26 in the array substrate, the auxiliary voltage being greater than or equal to the threshold voltage of the liquid crystal 28, so that the auxiliary electrode 26 and the common electrode on the color filter substrate 30 form an auxiliary electric field for driving the liquid crystal 28, the auxiliary electric field is also a vertical electric field, and when the vertical electric field between the pixel electrode 23 and the common electrode and the vertical electric field between the auxiliary electrode 26 and the common electrode are superimposed, the liquid crystal 28 near the first through hole 271, i.e. the liquid crystal 28 acted by the auxiliary electric field, is disordered due to insufficient rubbing alignment, so as to improve the dark state light leakage phenomenon and improve the image quality.
Referring to fig. 3, the metal common electrode 22 further has a portion corresponding to the position of the data line 252, that is, the metal common electrode 22 passes through a portion corresponding to the data line 252 on the peripheral side of the opening area, so that a height difference caused by a difference in the number of the film layers exists in the portion corresponding to the data line 252 on the peripheral side of the opening area, that is, a thickness difference caused by the layer where the metal common electrode 22 is located, and in the process of forming the alignment film, the position is also easily insufficient in rubbing alignment due to the height difference of the film layers, so that the liquid crystal 28 corresponding to the position is randomly arranged to cause a light leakage phenomenon, which affects the image quality.
In order to solve the above problem, in an embodiment, the auxiliary electrode 26 further has a portion corresponding to the data line 252, and optionally, the auxiliary electrode 26 and the portion of the metal common electrode 22 corresponding to the data line 252 are located between the data line 252 and the opening region, where when a dual gate structure is adopted, the data line 252 is disposed between two adjacent columns of pixel electrodes 23, the auxiliary electrodes 26 on both sides of the data line 252 cross the data line 252 to be connected to each other, and the metal common electrodes 22 on both sides of the data line 252 cross the data line 252 to be connected to each other.
Since the metal common electrode 22 is made of a light-tight metal material and is one of the factors affecting the height difference between the peripheral side of the opening region and the opening region, the auxiliary electrode 26 and the metal common electrode 22 are preferably arranged in a projection overlapping manner, so that the light leakage phenomenon is improved, the aperture ratio is not reduced, and the light transmittance of the display device is ensured. As shown in fig. 5 and 6, the transmittance-voltage curves of the white, red, green and blue pictures before the auxiliary electrode 26 is added to the display device shown in fig. 5, and the transmittance-voltage curves of the white, red, green and blue pictures after the auxiliary electrode 26 is added to the display device shown in fig. 6, it can be seen that the transmittance-voltage curves of the same color picture displayed by the display device before and after the auxiliary electrode 26 is added are substantially the same, and thus the aperture ratio is not decreased by the auxiliary electrode 26.
In one embodiment, the width of the auxiliary electrode 26 is smaller than the width of the metal common electrode 22, and the auxiliary electrode 26 is aligned with the edge of the metal common electrode 22 away from the opening area, that is, the auxiliary electrode 26 is further away from the opening area than the metal common electrode 22, so as to reduce the influence of the auxiliary electric field on the original vertical electric field.
According to the structure of the array substrate of the embodiment of the invention, the auxiliary electrode 26 is arranged corresponding to the metal common electrode 22 on the peripheral side of the opening area and has the part corresponding to the positions of the first through hole 271 and the data line 252, that is, the auxiliary electrode 26 is arranged at the position with the height difference of the film layer, so that the original disordered sequencing phenomenon can be improved by the liquid crystal 28 corresponding to the part under the action of the auxiliary electric field, the influence of the liquid crystal 28 on the peripheral side of the opening area on the light emitted from the opening area is reduced, the dark state light leakage phenomenon is improved, and the image quality is improved.
With reference to fig. 3 and fig. 4, the interlayer structure of the array substrate according to the embodiment of the invention may specifically be that a first metal layer, a gate insulating layer 24, a semiconductor channel layer, a second metal layer, a first insulating layer 27, a first transparent electrode layer, a second insulating layer 29, and a third metal layer or a second transparent electrode layer are sequentially disposed on one side of the substrate 20, wherein the first metal layer is formed with a gate line 251, a gate 211 of the thin film transistor 21, and a metal common electrode 22, that is, the metal common electrode 22 is formed on the layer where the gate 211 of the thin film transistor 21 is located, the second metal layer is formed with a data line 252, a source 212 and a drain 213 of the thin film transistor 21, the first transparent electrode layer is formed with a pixel electrode 23, the first insulating layer 27 is formed with a first through hole 271 exposing the drain 213 of the thin film transistor 21, and the second insulating layer 29 is formed with a second through hole exposing a signal line, an auxiliary electrode 26 is formed in the third metal layer or the second transparent electrode layer, that is, the auxiliary electrode 26 is a metal electrode or a transparent electrode.
According to the interlayer structure of the array substrate, the manufacturing method of the array substrate can comprise the following steps:
step one, forming a gate insulating layer 24;
step two, forming a patterned semiconductor channel layer;
step three, forming a patterned second metal layer, wherein the second metal layer comprises a source electrode 212 and a drain electrode 213 of the thin film transistor 21;
step four, forming a patterned first insulating layer 27, wherein the first insulating layer 27 includes a first via 271 exposing the source electrode 212 or the drain electrode 213 in the second metal layer, and the first via 271 corresponds to the first portion of the metal common electrode 22;
step five, forming a patterned first transparent electrode layer, wherein the first transparent electrode layer comprises pixel electrodes 23, each pixel electrode 23 has a portion 231 corresponding to the opening area, and each pixel electrode 23 is connected with the source electrode 212 or the drain electrode 213 in the second metal layer through a corresponding first through hole 271;
step six, forming a patterned second insulating layer 29, wherein the second insulating layer 29 comprises a second through hole exposing the signal line;
step seven, forming a patterned third metal layer or a second transparent electrode layer, where the third metal layer or the second transparent electrode layer includes an auxiliary electrode 26 disposed corresponding to the metal common electrode 22 on the periphery of the opening area, the auxiliary electrode 26 has a second portion corresponding to the position of the first via 271, and the auxiliary electrodes 26 are communicated with each other and connected to the signal line through the second via for forming an auxiliary electric field for driving the liquid crystal 28 with the common electrode on the color filter substrate 30.
In the above steps, each step is correspondingly patterned by a Mask (Mask).
Referring to fig. 4, the present invention further provides a display device, which includes a color filter substrate 30, a liquid crystal 28 and the array substrate as described above, wherein the liquid crystal 28 is disposed between the color filter substrate 30 and the array substrate, and the color filter substrate 30 is disposed with a common electrode.
The invention also provides a control method of the display device, which is applied to the display device and comprises the following steps:
monitoring the display state of a display device;
and step two, when the display state of the display device is a dark state, inputting an auxiliary voltage to the auxiliary electrode 26 in the array substrate, wherein the auxiliary voltage is greater than or equal to the threshold voltage of the liquid crystal 28, so that the auxiliary electrode 26 and the common electrode on the color filter substrate 30 form an auxiliary electric field for driving the liquid crystal 28.
Wherein, when the display device is in working state, the display state of the display device is monitored, for TN liquid crystal panel, when the display state of the display device is in dark state, a vertical electric field for driving the liquid crystal 28 to twist is formed between the pixel electrode 23 and the common electrode on the color filter substrate 30, at this time, the existing display device will generate light leakage phenomenon due to the disordered arrangement of the liquid crystal 28 around the opening area, and the embodiment of the invention can input the auxiliary voltage to the auxiliary electrode 26 in the array substrate by setting the auxiliary electrode 26 in dark state, the auxiliary voltage is greater than or equal to the threshold voltage of the liquid crystal 28, so that the auxiliary electrode 26 and the common electrode on the color filter substrate 30 form the auxiliary electric field for driving the liquid crystal 28, the auxiliary electric field is also a vertical electric field, when the vertical electric field between the pixel electrode 23 and the common electrode is superposed with the vertical electric field between the auxiliary electrode 26 and the common electrode, the liquid crystal 28 around the opening area, i.e. the liquid crystal 28 acted by the auxiliary electric field, is disordered due to insufficient rubbing alignment, so as to improve the dark state light leakage and improve the image quality.
The invention relates to an array substrate, a display device and a control method of the display device, wherein a thin film transistor, a metal common electrode, a pixel electrode and an auxiliary electrode are arranged in each pixel unit, the pixel electrode is provided with a part corresponding to an opening area of the array substrate, the metal common electrode and the auxiliary electrode are correspondingly arranged on the peripheral side of the opening area and are respectively provided with a part corresponding to the position of a first through hole, the auxiliary electrode in each pixel unit is connected to the same signal line and is used for forming an auxiliary electric field for driving liquid crystal with the common electrode on a color filter substrate, thus, the auxiliary electrode and the common electrode on the peripheral side of the opening area are correspondingly arranged and are provided with parts corresponding to the positions of the first through holes, the auxiliary electrode can form an auxiliary electric field for driving the liquid crystal with the common electrode on the color filter substrate, the problem of disordered arrangement of the liquid crystal near the first through hole due to insufficient rubbing alignment is, thereby improving the light leakage phenomenon in the dark state and improving the image quality.
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 (10)
1. An array substrate is applied to liquid crystal display, and comprises a plurality of pixel units, wherein each pixel unit is internally provided with a thin film transistor, a metal common electrode, a pixel electrode and an auxiliary electrode, the pixel electrode is connected with the source electrode or the drain electrode of the thin film transistor through a first through hole, the metal common electrode, the pixel electrode and the auxiliary electrode are sequentially arranged from bottom to top and are mutually insulated, the pixel electrodes are provided with parts corresponding to the opening areas of the array substrate, the metal common electrodes and the auxiliary electrodes are correspondingly arranged on the peripheral sides of the opening areas and are respectively provided with parts corresponding to the positions of the first through holes, and the auxiliary electrodes in the pixel units are connected to the same signal line and are used for forming auxiliary electric fields for driving liquid crystals with the common electrodes on the color filter substrate.
2. The array substrate of claim 1, wherein the auxiliary electrode and the metal common electrode further have portions corresponding to positions of data lines, respectively.
3. The array substrate of claim 2, wherein the auxiliary electrode and the portion of the metal common electrode corresponding to the position of the data line are located between the data line and the open area.
4. The array substrate of claim 2 or 3, wherein the data line is disposed between two adjacent columns of the pixel electrodes.
5. The array substrate of claim 1 or 2, wherein the auxiliary electrode overlaps a projection of the metal common electrode.
6. The array substrate of claim 1, wherein the metal common electrode is formed on a layer where a gate of the thin film transistor is located.
7. The array substrate of claim 1, wherein the auxiliary electrode is a metal electrode or a transparent electrode.
8. The array substrate of claim 1, wherein the width of the auxiliary electrode is smaller than the width of the metal common electrode, and an edge of the auxiliary electrode away from the opening area is aligned with an edge of the metal common electrode away from the opening area.
9. A display device comprising a color filter substrate, a liquid crystal and the array substrate of claim 1, wherein the liquid crystal is disposed between the color filter substrate and the array substrate, and wherein the color filter substrate is provided with a common electrode.
10. A control method of a display device applied to the display device according to claim 9, comprising:
monitoring the display state of the display device;
when the display state of the display device is a dark state, an auxiliary voltage is input to an auxiliary electrode in the array substrate, and the auxiliary voltage is greater than or equal to the threshold voltage of the liquid crystal, so that the auxiliary electrode and a common electrode on the color filter substrate form an auxiliary electric field for driving the liquid crystal.
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| CN110442255B (en) * | 2019-02-26 | 2021-08-27 | 京东方科技集团股份有限公司 | Touch substrate and touch display device |
| CN115981059B (en) * | 2023-03-20 | 2023-06-23 | 惠科股份有限公司 | Liquid crystal display panel and liquid crystal display |
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