CN106842745A - A kind of array base palte, display device and its driving method - Google Patents
A kind of array base palte, display device and its driving method Download PDFInfo
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- CN106842745A CN106842745A CN201710079905.6A CN201710079905A CN106842745A CN 106842745 A CN106842745 A CN 106842745A CN 201710079905 A CN201710079905 A CN 201710079905A CN 106842745 A CN106842745 A CN 106842745A
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- 239000010409 thin film Substances 0.000 claims abstract description 95
- 239000000758 substrate Substances 0.000 claims abstract description 66
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- 239000004973 liquid crystal related substance Substances 0.000 description 8
- 238000000059 patterning Methods 0.000 description 8
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- 230000002452 interceptive effect Effects 0.000 description 2
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- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- 229920005591 polysilicon Polymers 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000010168 coupling process Methods 0.000 description 1
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- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
-
- 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
-
- 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
- G02F1/13338—Input devices, e.g. touch panels
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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
- G02F1/136286—Wiring, e.g. gate line, drain line
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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
- G02F1/1368—Active matrix addressed cells in which the switching element is a three-electrode device
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
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- Crystallography & Structural Chemistry (AREA)
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- Optics & Photonics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
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- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
The present invention provides a kind of array base palte, display device and its driving method, is related to technical field of touch-control display, can improve the reliability of voltage homogeneity and display device.The array base palte includes：Substrate, sets grid line and data wire over the substrate, and the grid line and the data wire intersect restriction sub-pixel；The sub-pixel includes first film transistor, the second thin film transistor (TFT), first transparency electrode and second transparency electrode；The grid of the first film transistor is electrically connected with the grid line, and source electrode is electrically connected with the data wire, and drain electrode is electrically connected with the first transparency electrode；The grid of second thin film transistor (TFT) is electrically connected with touch-control scan line, and source electrode is electrically connected with touch-control lead, and drain electrode is electrically connected with the second transparency electrode；Wherein, the first transparency electrode and the second transparency electrode insulate, and in the orthographic projection no overlap of the substrate.
Description
Technical Field
The invention relates to the technical field of touch display, in particular to an array substrate, a display device and a driving method of the display device.
Background
The embedded capacitive touch screen integrates a touch electrode structure in a display screen, has the advantages of simple structure, light weight, thinness and low cost, and is increasingly becoming the mainstream technology of the touch screen, for example, the embedded capacitive touch screen is increasingly widely applied to various portable intelligent terminals (such as mobile phones).
The In-Cell capacitive touch screen can be divided into an On-Cell touch screen and an In-Cell touch screen, wherein the In-Cell touch screen can be divided into a Hybrid In-Cell (HIC) capacitive touch screen and a Full In-Cell (FIC) capacitive touch screen.
At present, an embedded capacitive touch screen is mainly a Full In-Cell (FIC) capacitive touch screen, and a touch electrode and a common electrode of the existing FIC capacitive touch screen are shared, so that the voltage uniformity of the common electrode is poor In a display process. On the basis, since the touch signal is not a positive-negative inversion signal with the reference voltage as the center, the liquid crystal is easy to relatively deflect to one side for a long time, which causes voltage residue, thereby causing phenomena such as large flicker and easy drift of the display screen, and further causing the reliability of the display device, especially a high-resolution and high-frequency display device such as LTPS (Low Temperature polysilicon technology), to be reduced.
Disclosure of Invention
Embodiments of the present invention provide an array substrate, a display device and a driving method thereof, which can improve voltage uniformity and reliability of the display device.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, an array substrate is provided, which includes a substrate, and a gate line and a data line disposed on the substrate, where the gate line and the data line intersect to define a sub-pixel; the sub-pixel comprises a first thin film transistor, a second thin film transistor, a first transparent electrode and a second transparent electrode; the grid electrode of the first thin film transistor is electrically connected with the grid line, the source electrode of the first thin film transistor is electrically connected with the data line, and the drain electrode of the first thin film transistor is electrically connected with the first transparent electrode; the grid electrode of the second thin film transistor is electrically connected with the touch scanning line, the source electrode of the second thin film transistor is electrically connected with the touch lead, and the drain electrode of the second thin film transistor is electrically connected with the second transparent electrode; wherein the first transparent electrode and the second transparent electrode are insulated and do not overlap in the orthographic projection of the substrate.
Preferably, the second transparent electrode is arranged around the first transparent electrode; or the first transparent electrode is arranged around the second transparent electrode.
Preferably, the sub-pixel further comprises a common electrode, and an overlapping region exists between an orthographic projection of the common electrode on the substrate and an orthographic projection of the first transparent electrode and the second transparent electrode on the substrate.
Further preferably, the common electrode is disposed on a side of the first transparent electrode and the second transparent electrode away from the substrate; wherein the common electrode includes a plurality of electrically connected bar-shaped electrodes; or the common electrode is arranged on one side of the first transparent electrode and one side of the second transparent electrode close to the substrate; wherein the first transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; the second transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; or the common electrode is arranged on one side of the first transparent electrode and one side of the second transparent electrode close to the substrate; wherein the first transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; the second transparent electrode is a planar electrode.
Based on the above optimization, the grid lines and the touch scanning lines are arranged in parallel and formed synchronously; the data lines and the touch lead lines are arranged in parallel and formed synchronously.
Preferably, the first thin film transistor and the second thin film transistor are formed simultaneously; the first transparent electrode and the second transparent electrode are formed simultaneously.
In a second aspect, a display device is provided, which includes the array substrate of the first aspect.
In a third aspect, there is provided a driving method of the display device according to the second aspect, comprising: in each frame, the grid lines input first scanning signals line by line, the data lines input data signals, and the first transparent electrodes are driven to display; meanwhile, the touch scanning lines input second scanning signals line by line, and the touch lead inputs touch driving signals to drive the second transparent electrode for touch; the touch lead respectively outputs a first voltage signal and a second voltage signal in adjacent frames, the first voltage is higher than the common voltage, and the second voltage is lower than the common voltage.
Preferably, after the first scanning signal is input to the gate line in at least the (N + 1) th row, the second scanning signal is input to the touch scanning line in the nth row; the grid line in the (N + 1) th row is connected with a first thin film transistor in the sub-pixel in the (N + 1) th row, and the touch control scanning line in the Nth row is connected with a second thin film transistor in the sub-pixel in the Nth row.
Preferably, in a frame time, after the touch scanning is finished, the method further includes: and the touch control scanning lines input second scanning signals line by line, and the touch control lead inputs data signals to drive the second transparent electrode for displaying.
The embodiment of the invention provides an array substrate, a display device and a driving method thereof, wherein a first thin film transistor and a first transparent electrode connected with a drain electrode of the first thin film transistor are arranged in each sub-pixel, and a grid electrode of the first thin film transistor is connected with a grid line and a source electrode of the first thin film transistor is connected with a data line; on the basis, the second thin film transistor and the second transparent electrode connected with the drain electrode of the second thin film transistor are arranged in each sub-pixel, the grid electrode of the second thin film transistor is connected with the touch scanning line, and the source electrode of the second thin film transistor is connected with the touch lead wire, so that when a touch driving signal is applied to the touch scanning line, the second transparent electrode is based on a self-capacitance mode or a mutual capacitance mode together with the common electrode, and the touch position can be identified. On the one hand, when the second transparent electrode identifies the touch position based on the self-capacitance mode, the display and the touch can be mutually independent, so that the touch position can be identified while the display is carried out, and the reduction of the display charging time is avoided; on the other hand, because the touch electrode and the common electrode are not required to be shared, the voltage uniformity of the common electrode can not be influenced; on the other hand, the touch scanning is carried out while the display charging is carried out, and the reference voltage can be provided for the touch scanning, so that the voltage of the touch scanning can be adjusted to be respectively higher than the common voltage or lower than the common voltage in adjacent frames, and the phenomena that the display picture flickers greatly and is easy to drift and the like can be avoided; based on the above, the reliability of the display device can be improved, and the display quality of the display device can be improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a first schematic top view of an array substrate according to an embodiment of the present invention;
fig. 2 is a second schematic top view of an array substrate according to an embodiment of the present invention;
fig. 3 is a schematic top view illustrating a third exemplary embodiment of an array substrate;
fig. 4 is a schematic top view illustrating an array substrate according to an embodiment of the present invention;
fig. 5 is a schematic top view illustrating an array substrate according to an embodiment of the present invention;
fig. 6 is a schematic top view illustrating a sixth exemplary embodiment of an array substrate;
FIG. 7 is a schematic cross-sectional view of AA' of FIG. 6;
fig. 8 is a schematic top view illustrating an array substrate according to an embodiment of the present invention;
FIG. 9 is a schematic sectional view taken along direction BB' in FIG. 8;
FIG. 10 is a schematic sectional view taken along line CC' of FIG. 8;
fig. 11 is an eighth schematic top view of an array substrate according to an embodiment of the present invention;
FIG. 12 is a schematic sectional view of the direction DD' in FIG. 11;
FIG. 13 is a schematic sectional view of EE' shown in FIG. 11;
FIG. 14 is a first timing diagram of a driving display device according to an embodiment of the present invention;
fig. 15 is a second timing diagram of a driving display device according to an embodiment of the invention.
Reference numerals:
10-a substrate; 20-a gate line; 30-a data line; 40-touch scan lines; 50-touch lead; 60-a first thin film transistor; 70-a second thin film transistor; 81-a first transparent electrode; 82-a second transparent electrode; 83-common electrode.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
An embodiment of the present invention provides an array substrate, as shown in fig. 1 to 5, including a substrate 10, a gate line 20 and a data line 30 disposed on the substrate 10, where the gate line 20 and the data line 30 cross to define a sub-pixel; the sub-pixel includes a first thin film transistor 60, a second thin film transistor 70, a first transparent electrode 81, and a second transparent electrode 82; a gate electrode of the first thin film transistor 60 is electrically connected to the gate line 20, a source electrode is electrically connected to the data line 30, and a drain electrode is electrically connected to the first transparent electrode 81; the gate of the second thin film transistor 70 is electrically connected to the touch scan line 40, the source is electrically connected to the touch lead 50, and the drain is electrically connected to the second transparent electrode 82; wherein the first transparent electrode 81 and the second transparent electrode 82 are insulated and have no overlap in the orthographic projection of the substrate 10.
In this case, the gate electrode of the first thin film transistor 60 is electrically connected to the gate line 20, the source electrode is electrically connected to the data line 30, and the drain electrode is electrically connected to the first transparent electrode 81, so that the first transparent electrode 81 serves as a pixel electrode. On this basis, when the array substrate is used in a liquid crystal display device, the first transparent electrode 81 drives liquid crystal in common with the common electrode to realize display light emission of each sub-pixel. Here, the common electrode may or may not be disposed on the array substrate.
As for the second transparent electrode 82, it is mainly used for touch control. On the basis, the scanning time of one frame of display is considered to be longer than that of one frame of touch, so that the second transparent electrode 82 can also be used as an auxiliary pixel electrode after one frame of touch is scanned, so as to enlarge the display area of each sub-pixel. Of course, the second transparent electrode 82 may not be used as an auxiliary pixel electrode. When the second transparent electrode 82 is used as a touch electrode or an auxiliary pixel electrode, the signals applied to the touch lead 50 are used for distinguishing.
When the second transparent electrode 82 is used for identifying touch, the identification of the touch position can be realized based on a self-contained manner, and at this time, the second transparent electrode 82 can be used as a touch electrode. That is, scanning signals are input line by line through the touch scanning lines 40, so that the corresponding second thin film transistors 70 are turned on, the touch leads 50 input touch driving signals to the second transparent electrodes 82, and receive touch feedback signals, so that the feedback signals received by the corresponding touch leads 50 are changed according to the change of capacitance on the second transparent electrodes 82 at the touch position, and thus the touch position is determined.
When the second transparent electrode 82 is used for touch recognition, the touch position recognition can also be realized based on a mutual capacitance mode, and in this case, the second transparent electrode 82 can be used as a driving electrode, and a common electrode (which can be disposed on the array substrate or on the cell substrate when the array substrate is used in a liquid crystal display device) can be used as a sensing electrode in a time sharing manner. That is, scanning signals are input line by line through the touch scanning lines 40, so that the corresponding second thin film transistors 70 are turned on, and the touch lead 50 inputs a touch driving signal to the second transparent electrode 82, so that the common electrode at the touch position outputs a touch sensing signal according to a change of capacitance on the second transparent electrode 82 at the touch position, thereby determining the touch position. In this case, for the structure of the common electrode, it is necessary to cooperate with the second transparent electrode 82 to recognize the touch position on the basis of ensuring that each sub-pixel can perform display.
On this basis, since the touch lead 50 and the data line 30 are independent of each other, fingerprint recognition can also be achieved when the second transparent electrode 82 is used for recognition of touch by an IC (integrated circuit) connected to the touch lead 50. Therefore, compared with the method for manufacturing the fingerprint identification function on the frame of the display device, the method for manufacturing the fingerprint identification function on the display device increases the width of the frame, and is more beneficial to realizing the narrow frame of the display device.
In addition, since the sources and the drains of the first thin film transistor 60 and the second thin film transistor 70 are symmetrical, there is no difference between the sources and the drains. In order to distinguish the two electrodes of the thin film transistor except the gate electrode, one of the two electrodes is called a source electrode, and the other electrode is called a drain electrode.
The specific structures of the first thin film transistor 60 and the second thin film transistor 70 may be the same, but may also be different, and are not limited herein.
The first thin film transistor 60 and the second thin film transistor 70 may be amorphous silicon thin film transistors, oxide thin film transistors, low temperature polysilicon thin film transistors, organic thin film transistors, or the like.
The first thin film transistor 60 and the second thin film transistor 70 may have a bottom gate structure or a top gate structure.
Third, in order to ensure the display performance, the size of the first transparent electrode 81 should be as large as possible, and correspondingly, the size of the second transparent electrode 82 should be as small as possible based on the touch position recognition.
Based on this, specific arrangement positions and structures of the first transparent electrode 81 and the second transparent electrode 82 are not limited as long as they are insulated and orthographic projections on the substrate 10 do not overlap. For example, in the same sub-pixel, as shown in fig. 1 and 5, the first and second transparent electrodes 81 and 82 may be disposed along the extending direction of the data line 30; alternatively, as shown in fig. 2, the first and second transparent electrodes 81 and 82 may be disposed along the extending direction of the gate line 20; of course, the second transparent electrode 82 may be disposed around the first transparent electrode 81 as shown in fig. 3, or the first transparent electrode 81 may be disposed around the second transparent electrode 82 as shown in fig. 4.
As will be understood by those skilled in the art in fig. 3, since the drain electrode of the first thin film transistor 60 needs to cross over the second transparent electrode 82 and electrically connect to the first transparent electrode 81 located inside the second transparent electrode 82, the first thin film transistor 60 needs to be insulated from the second transparent electrode 82. Similarly, in fig. 4, since the drain electrode of the second thin film transistor 70 needs to cross the first transparent electrode 81 and electrically connect to the second transparent electrode 82 located inside the first transparent electrode 81, it is necessary to ensure that the second thin film transistor 70 is insulated from the first transparent electrode 81.
In addition, the first transparent electrode 81 and the second transparent electrode 82 may be disposed in the same layer (i.e., formed through the same patterning process), or may be disposed in different layers.
The embodiment of the invention provides an array substrate, wherein a first thin film transistor 60 and a first transparent electrode 81 connected with a drain electrode of the first thin film transistor 60 are arranged in each sub-pixel, and a grid electrode of the first thin film transistor 60 is connected with a grid line 20 and a source electrode of the first thin film transistor 60 is connected with a data line 30, so that when the array substrate is used for a display device, the display luminescence of the sub-pixels can be realized; on this basis, by providing the second thin film transistor 70 and the second transparent electrode 82 connected to the drain of the second thin film transistor 70 in each sub-pixel, connecting the gate of the second thin film transistor 70 to the touch scanning line 40, and connecting the source of the second thin film transistor 70 to the touch lead 50, when a touch driving signal is applied to the touch lead 50, the second transparent electrode 82 can be based on a self-capacitance method or a mutual capacitance method together with the common electrode, thereby recognizing the touch position.
On the one hand, when the second transparent electrode 82 identifies the touch position based on the self-contained mode, the display and the touch can be mutually independent, so that the touch position can be identified while the display is performed, and the reduction of the display charging time is avoided; on the other hand, because the touch electrode and the common electrode are not required to be shared, the voltage uniformity of the common electrode can not be influenced; on the other hand, the touch scanning is carried out while the display charging is carried out, and the reference voltage can be provided for the touch scanning, so that the voltage of the touch scanning can be adjusted to be respectively higher than the common voltage or lower than the common voltage in adjacent frames, and the phenomena that the display picture flickers greatly and is easy to drift and the like can be avoided; based on the above, the reliability of the display device can be improved, and the display quality of the display device can be improved.
Preferably, as shown in fig. 2 to 5, for any one of the sub-pixels, the data line 30 connected to the first thin film transistor 60 in the sub-pixel and the touch lead 50 connected to the second thin film transistor 70 in the sub-pixel are respectively disposed on both sides of the sub-pixel along the gate line 20 direction.
In the embodiment of the present invention, the data line 30 and the touch lead 50 respectively connected to the first thin film transistor 60 and the second thin film transistor 70 in the same sub-pixel are respectively disposed at two sides of the sub-pixel along the gate line 20, so that there is no crossing between the data line 30 and the touch lead 50, and the influence between the data line 30 and the touch lead 50 can be avoided.
Preferably, as shown in fig. 3, the second transparent electrode 82 is disposed around the first transparent electrode 81.
Since the second transparent electrode 82 is disposed at the periphery of the first transparent electrode 81, the second transparent electrode 82 can shield the metal wires and the like located outside the second transparent electrode from interfering with the first transparent electrode 81, so that the display effect is better.
Alternatively, as shown in fig. 4, the first transparent electrode 81 is disposed around the second transparent electrode 82.
Since the first transparent electrode 81 is disposed at the periphery of the second transparent electrode 82, the first transparent electrode 81 can shield metal wires and the like located outside the first transparent electrode from interfering with the second transparent electrode 82, so that the second transparent electrode 82 can be better identified when used for fine identification such as fingerprint identification.
Preferably, as shown in fig. 6 to 13, the sub-pixel further includes a common electrode 83, and an orthogonal projection of the common electrode 83 on the substrate 10 has an overlapping region with an orthogonal projection of the first transparent electrode 81 and the second transparent electrode 82 on the substrate 10.
Note that the first transparent electrode 81 and the second transparent electrode 82 are provided to be insulated from the common electrode 83.
In addition, as will be understood by those skilled in the art, since the first transparent electrode 81 is used as a pixel electrode and the second transparent electrode 82 is also used as an auxiliary pixel electrode, the common electrode 83 is configured to drive the liquid crystal in the corresponding region to deflect under the action of an electric field generated between the first transparent electrode 81 and the common electrode 83. On the basis, when the second transparent electrode 82 is used as an auxiliary pixel electrode, the liquid crystal in the corresponding area is driven to correspondingly deflect under the action of an electric field generated between the second transparent electrode and the common electrode 83.
It should be noted that, because the touch driving signal is very small relative to the data signal, when the second transparent electrode 82 is used for touch control, the electric field formed by the second transparent electrode 82 and the common electrode 83 does not affect the liquid crystal deflection in the area corresponding to the second transparent electrode 82, that is, the area does not leak light.
According to the embodiment of the invention, the common electrode 83 is arranged on the array substrate, so that the display device has the advantages of large visual angle, high response speed, accurate color reduction and the like.
Further preferably, as shown in fig. 6 and 7, the common electrode 83 may be disposed on a side of the first transparent electrode 81 and the second transparent electrode 82 away from the substrate 10; wherein the common electrode 83 includes a plurality of electrically connected bar-shaped electrodes.
Based on this, the first transparent electrode 81 and the second transparent electrode 82 may have the same structure, for example, the first transparent electrode 81 and the second transparent electrode 82 may be strip-shaped electrodes each including a plurality of electrical connections, or both planar electrodes; the first transparent electrode 81 and the second transparent electrode 82 may be different, for example, the first transparent electrode 81 and the second transparent electrode 82 are a planar electrode and a stripe electrode including a plurality of electrical connections, respectively.
In this case, after the touch scan is finished, the second transparent electrode 82 can be used as an auxiliary pixel electrode for displaying, so as to enlarge the display area of each sub-pixel.
It should be noted that the common electrode 83 in all the sub-pixels can be formed simultaneously and connected as a whole.
Alternatively, as shown in fig. 8 to 10, the common electrode 83 may be disposed on a side of the first and second transparent electrodes 81 and 82 close to the substrate 10; wherein the first transparent electrode 81 includes a plurality of electrically connected bar-shaped electrodes; the second transparent electrode 82 includes a plurality of electrically connected stripe-shaped electrodes.
Based on this, the common electrode 83 may be a planar electrode or include a plurality of electrically connected stripe-shaped electrodes.
In this case, after the touch scan is finished, the second transparent electrode 82 can be used as an auxiliary pixel electrode for displaying, so as to enlarge the display area of each sub-pixel.
Alternatively, as shown in fig. 11 to 13, the common electrode 83 may be disposed on a side of the first and second transparent electrodes 81 and 82 close to the substrate 10; wherein the first transparent electrode 81 includes a plurality of electrically connected bar-shaped electrodes; the second transparent electrode 82 is a planar electrode.
In this case, the second transparent electrode 82 is used only as a touch electrode.
It should be noted that, based on the above description of the position where the common electrode 83 is disposed, when the second transparent electrode 82 identifies the touch position based on the self-contained manner, the common electrodes 83 located at the corresponding positions of all the sub-pixels may be electrically connected together.
Based on the above preferred, as shown in fig. 1 to 6, 8 and 11, the gate lines 20 are disposed in parallel with the touch scan lines 40 and are formed simultaneously; the data lines 30 are disposed in parallel with the touch leads 50 and are formed simultaneously.
The gate line 20 and the touch scan line 40 are formed simultaneously, that is, the gate line 20 and the touch scan line 40 are formed through a single patterning process. The data line 30 is formed in synchronization with the touch lead 50, that is, the data line 30 and the touch lead 50 are formed through a one-time patterning process.
In the embodiment of the invention, the gate lines 20 and the touch scanning lines 40 are formed synchronously, and the data lines 30 and the touch leads 50 are formed synchronously, so that the composition process can be reduced, and the preparation cost can be reduced.
Based on the above preferable feature, the first thin film transistor 60 and the second thin film transistor 70 are formed simultaneously; the first transparent electrode 81 and the second transparent electrode 82 are formed simultaneously.
When the first thin film transistor 60 and the second thin film transistor 70 are formed simultaneously, the first thin film transistor 60 and the second thin film transistor 70 have the same structure.
In addition, the first thin film transistor 60 and the second thin film transistor 70 are formed simultaneously, that is, the gate electrode of the first thin film transistor 60 and the gate electrode of the second thin film transistor 70, the active layer of the first thin film transistor 60 and the active layer of the second thin film transistor 70, and the source electrode and the drain electrode of the first thin film transistor 60 and the source electrode and the drain electrode of the second thin film transistor 70 are formed through a patterning process. The first transparent electrode 81 and the second transparent electrode 82 are formed simultaneously, that is, the first transparent electrode 81 and the second transparent electrode 82 are formed through a single patterning process.
In the embodiment of the present invention, the first thin film transistor 60 and the second thin film transistor 70 are formed simultaneously, and the first transparent electrode 81 and the second transparent electrode 82 are formed simultaneously, so that the patterning process can be further reduced, and the manufacturing cost can be reduced.
Based on the above, if the first transparent electrode 81 and the second transparent electrode 82 are located on the side of the gate metal layer close to the substrate 10, the gate line 20, the touch scan line 40, the first transparent electrode 81, and the second transparent electrode 82 may be formed through a single patterning process. When the common electrode 83 is disposed on the first transparent electrode 81 and the second transparent electrode 82 close to the substrate 10, if the common electrode 83 is disposed on the gate metal layer close to the substrate 10, the gate line 20, the touch scan line 40, and the common electrode 83 may be formed by a single patterning process.
An embodiment of the invention provides a display device, which includes the array substrate.
Wherein, the display device also comprises a box aligning substrate.
In addition, when the common electrode 83 is disposed on the pair of cassette substrates, the second transparent electrode 82 can be used as an auxiliary pixel electrode to display after the touch scan is finished, regardless of whether the second transparent electrode 82 includes a plurality of electrically connected strip electrodes or planar electrodes.
The embodiment of the invention also provides a display device, which has the same technical effect as the array substrate and is not repeated herein.
An embodiment of the present invention further provides a driving method of the display device, as shown in fig. 14, including: in each frame, the gate line 20 inputs a first scan signal line by line, the data line 30 inputs a data signal, and drives the first transparent electrode 81 for display; meanwhile, the touch scanning lines 40 input second scanning signals line by line, and the touch lead 50 inputs touch driving signals to drive the second transparent electrodes 82 for touch; in adjacent frames, the touch lead 50 outputs a first voltage signal and a second voltage signal, respectively, where the first voltage is higher than the common voltage, and the second voltage is lower than the common voltage.
The common voltage is a voltage applied to the common electrode 83 when the display device displays a display.
In addition, the second transparent electrode 82 is driven for touch recognition, and recognition of a touch position can be realized based on a self-contained manner, and at this time, the second transparent electrode 82 can be used as a touch electrode. That is, scanning signals are input line by line through the touch scanning lines 40, so that the corresponding second thin film transistors 70 are turned on, the touch leads 50 input touch driving signals to the second transparent electrodes 82, and receive touch feedback signals, so that the feedback signals received by the corresponding touch leads 50 are changed according to the change of capacitance on the second transparent electrodes 82 at the touch position, and thus the touch position is determined.
When the second transparent electrode 82 is used for identifying touch, the identification of the touch position can also be realized based on a mutual capacitance mode, in this case, the second transparent electrode 82 can be used as a driving electrode, and the common electrode 83 can be used as a sensing electrode in a time-sharing manner. That is, scanning signals are input line by line through the touch scanning lines 40, so that the corresponding second thin film transistors 70 are turned on, and the touch lead 50 inputs a touch driving signal to the second transparent electrode 82, so that the common electrode 83 at the touch position outputs a touch sensing signal according to a change of capacitance on the second transparent electrode 82 at the touch position, thereby determining the touch position. In this case, the structure of the common electrode 83 needs to be capable of cooperating with the second transparent electrode 82 to recognize the touch position while ensuring that each sub-pixel can display.
On this basis, since the touch lead 50 and the data line 30 are independent of each other, fingerprint recognition can be also achieved when the second transparent electrode 82 is used for recognition of touch by the IC connected to the touch lead 50.
The first scan signal and the second scan signal are not limited as long as the first thin film transistor 60 and the second thin film transistor 70 can be controlled to be turned on, respectively. On this basis, the first scanning signal and the second scanning signal may be the same or different.
In addition, because the touch driving signal is small relative to the data signal, when the second transparent electrode 82 is driven for touch, the electric field formed by the second transparent electrode 82 and the common electrode 83 does not affect the liquid crystal deflection of the area corresponding to the second transparent electrode 82, that is, the area does not leak light.
In each frame, by inputting a first scanning signal to the gate line 20 line by line, inputting a data signal to the data line 30, and driving the first transparent electrode 81 for displaying, the display luminescence of the sub-pixel can be realized; on this basis, the second scanning signals are input to the touch scanning lines 40 line by line, and the touch driving signals are input to the touch lead 50, so that the second transparent electrode 82 is based on a self-capacitance mode, or based on a mutual capacitance mode together with the common electrode 83, and the touch position can be identified.
On the one hand, when the second transparent electrode 82 identifies the touch position based on the self-contained mode, the display and the touch can be mutually independent, so that the touch position can be identified while the display is performed, and the reduction of the display charging time is avoided; on the other hand, because the touch electrode and the common electrode are not required to be shared, the voltage uniformity of the common electrode can not be influenced; on the other hand, the touch scanning is performed while the display charging is performed, and a reference voltage can be provided for the touch scanning, so that in adjacent frames, the voltage on the touch scanning can be adjusted to be respectively higher than the common voltage or lower than the common voltage, the reliability of the display device can be improved, and the display quality of the display device can be improved.
Preferably, after the first scan signal is input to at least the (N + 1) th row of gate lines 20, the second scan signal is input to the nth row of touch scan lines 40; the (N + 1) th row of gate lines 20 is connected to the first thin film transistors 60 in the (N + 1) th row of sub-pixels, and the nth row of touch scan lines 40 is connected to the second thin film transistors 70 in the N th row of sub-pixels.
Note that, the count of the number of rows of the gate lines 20 and the touch scan lines 40 (i.e., the first row and the second row …) is the same as the count of the number of rows of the connected sub-pixels. For example, taking the fifth row of sub-pixels as an example, the gate line 20 connected to the first thin film transistor 60 in the fifth row of sub-pixels is the fifth row of gate line 20; the touch scan line 40 connected to the second tft 70 in the sub-pixel in the fifth row is the touch scan line 40 in the fifth row.
In the embodiment of the present invention, after the first scanning signal is input to at least the (N + 1) th row of gate lines 20, the second scanning signal is input to the nth row of touch scanning lines 40, so that the input of the first scanning signal to the gate lines 20 and the input of the second scanning signal to the touch scanning lines 40 are performed at different times in the same sub-pixel, and thus, no coupling capacitance is generated between the first transparent electrode 81 and the second transparent electrode 82, thereby avoiding the influence on the display of the sub-pixels of the display device.
Preferably, as shown in fig. 15, in one frame time, after the touch scanning is finished, the method further includes: the touch scanning lines 40 input second scanning signals line by line, and the touch lead 50 inputs data signals to drive the second transparent electrodes 82 for displaying.
Compared with the display scanning, the touch scanning takes a short time, and therefore, after the touch scanning is finished, the second scanning signal is input to the touch scanning line 40, the data signal is input to the touch lead 50, and at this time, the second transparent electrode 82 serves as an auxiliary pixel electrode to enlarge the display area of each sub-pixel.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An array substrate comprises a substrate, a grid line and a data line, wherein the grid line and the data line are arranged on the substrate and intersect to define a sub-pixel; the display device is characterized in that the sub-pixel comprises a first thin film transistor, a second thin film transistor, a first transparent electrode and a second transparent electrode;
the grid electrode of the first thin film transistor is electrically connected with the grid line, the source electrode of the first thin film transistor is electrically connected with the data line, and the drain electrode of the first thin film transistor is electrically connected with the first transparent electrode;
the grid electrode of the second thin film transistor is electrically connected with the touch scanning line, the source electrode of the second thin film transistor is electrically connected with the touch lead, and the drain electrode of the second thin film transistor is electrically connected with the second transparent electrode;
wherein the first transparent electrode and the second transparent electrode are insulated and do not overlap in the orthographic projection of the substrate.
2. The array substrate of claim 1, wherein the second transparent electrode is disposed around the first transparent electrode; or the first transparent electrode is arranged around the second transparent electrode.
3. The array substrate of claim 1, wherein the sub-pixels further comprise a common electrode, and an orthographic projection of the common electrode on the substrate and an orthographic projection of the first transparent electrode and the second transparent electrode on the substrate are overlapped.
4. The array substrate of claim 3, wherein the common electrode is disposed on a side of the first transparent electrode and the second transparent electrode away from the substrate; wherein the common electrode includes a plurality of electrically connected bar-shaped electrodes; or,
the common electrode is arranged on one side of the first transparent electrode and one side of the second transparent electrode close to the substrate; wherein the first transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; the second transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; or,
the common electrode is arranged on one side of the first transparent electrode and one side of the second transparent electrode close to the substrate; wherein the first transparent electrode comprises a plurality of electrically connected strip-shaped electrodes; the second transparent electrode is a planar electrode.
5. The array substrate of any one of claims 1-4, wherein the gate lines and the touch scan lines are disposed in parallel and formed simultaneously;
the data lines and the touch lead lines are arranged in parallel and formed synchronously.
6. The array substrate of any one of claims 1-4, wherein the first thin film transistor and the second thin film transistor are formed simultaneously;
the first transparent electrode and the second transparent electrode are formed simultaneously.
7. A display device comprising the array substrate according to any one of claims 1 to 6.
8. A driving method of a display device according to claim 7, comprising:
in each frame, the grid lines input first scanning signals line by line, the data lines input data signals, and the first transparent electrodes are driven to display; meanwhile, the touch scanning lines input second scanning signals line by line, and the touch lead inputs touch driving signals to drive the second transparent electrode for touch;
the touch lead respectively outputs a first voltage signal and a second voltage signal in adjacent frames, the first voltage is higher than the common voltage, and the second voltage is lower than the common voltage.
9. The driving method according to claim 8, wherein a second scan signal is input to the touch scan line in the nth row at least after the first scan signal is input to the gate line in the (N + 1) th row;
the grid line in the (N + 1) th row is connected with a first thin film transistor in the sub-pixel in the (N + 1) th row, and the touch control scanning line in the Nth row is connected with a second thin film transistor in the sub-pixel in the Nth row.
10. The driving method according to claim 8, wherein within a frame time, after the touch scanning is finished, the method further comprises: and the touch control scanning lines input second scanning signals line by line, and the touch control lead inputs data signals to drive the second transparent electrode for displaying.
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