CN110619859B - Display substrate, driving method thereof and display device - Google Patents
Display substrate, driving method thereof and display device Download PDFInfo
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- CN110619859B CN110619859B CN201911047721.7A CN201911047721A CN110619859B CN 110619859 B CN110619859 B CN 110619859B CN 201911047721 A CN201911047721 A CN 201911047721A CN 110619859 B CN110619859 B CN 110619859B
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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
- G02F1/13338—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
- G02F1/134363—Electrodes characterised by their geometrical arrangement for applying an electric field parallel to the substrate, i.e. in-plane switching [IPS]
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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
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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
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
- G09G3/3611—Control of matrices with row and column drivers
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Abstract
The invention provides a display substrate which comprises a display area, wherein the display area is divided into a plurality of pixel units, a pixel electrode layer and a common electrode layer are arranged in the display area, and the pixel electrode layer comprises a plurality of pixel electrodes which are in one-to-one correspondence with the pixel units; the common electrode layer comprises a plurality of common electrodes, each common electrode and at least one pixel electrode form a pixel capacitor, and the common electrodes are multiplexed into touch electrodes in an induction stage; wherein, the display substrate further includes: the gating units are electrically connected with the pixel electrodes in a one-to-one correspondence mode and used for conducting the pixel electrodes and a common electrode forming a pixel capacitor with the pixel electrodes under the control of gating signals; and under the control of the turn-off signal, the pixel electrode and the common electrode are disconnected. The invention also provides a driving method of the display substrate and a display device. By adopting the display substrate, the problem of continuous accumulation of the voltage difference between the pixel electrode and the common electrode is solved.
Description
Technical Field
The invention relates to the technical field of display, in particular to a display substrate, a driving method of the display substrate and a display device.
Background
With the development of the display industry, application scenes of display products are diversified, and the touch display device is aroused by gestures in a screen-off state to become a conventional application.
In the prior art, in the gesture wake-up mode, a scanning signal is usually output to a common electrode layer of a touch display device, and whether a gesture wake-up operation occurs is determined according to a wake-up sensing signal generated by the common electrode layer. However, in the gesture wake-up mode, a pressure difference exists between the common electrode layer and the pixel electrode layer of the touch display device, and as the time of the gesture wake-up mode increases (for example, the touch display device is in a standby state for a long time), the pressure difference between the common electrode layer and the pixel electrode layer is continuously accumulated, so that poor display such as liquid crystal polarization and uneven brightness occurs in the touch display device.
Disclosure of Invention
The present invention is directed to at least one of the technical problems of the prior art, and provides a display substrate, a driving method of the display substrate, and a display device.
In order to achieve the above object, the present invention provides a display substrate, including a display area, the display area being divided into a plurality of pixel units, a pixel electrode layer and a common electrode layer being disposed in the display area, the pixel electrode layer including a plurality of pixel electrodes corresponding to the plurality of pixel units one to one; the common electrode layer comprises a plurality of common electrodes, each common electrode and at least one pixel electrode form a pixel capacitor, and the common electrodes are multiplexed as touch electrodes in an induction stage;
the display substrate further includes: the gating units are electrically connected with the pixel electrodes in a one-to-one correspondence mode and used for conducting the pixel electrodes and the common electrodes forming pixel capacitors with the pixel electrodes under the control of gating signals; and under the control of a turn-off signal, disconnecting the pixel electrode and the common electrode.
Optionally, the gating unit includes a first gating transistor, a first pole of the first gating transistor is electrically connected to the pixel electrode, a second pole of the first gating transistor is electrically connected to the common electrode, and a gate of the first gating transistor is configured to receive the gating signal or the turn-off signal.
Optionally, the display substrate further includes a first control line, and the gates of the plurality of first gating transistors are electrically connected to the first control line.
Optionally, the common electrode and the pixel electrodes are both disposed on a substrate, and an orthogonal projection of each common electrode on the substrate covers an orthogonal projection of a plurality of pixel electrodes on the substrate.
The invention also provides a display device, which comprises a control unit and the display substrate, wherein the control unit is electrically connected with the gating unit and is used for:
in a non-induction stage in a screen-off awakening state, sending the gating signal to the gating unit; and (c) a second step of,
and sending the turn-off signal to the gating unit in a display stage in a touch display state.
Optionally, the display region is further provided with a plurality of gate lines and a plurality of data lines, and the plurality of gate lines and the plurality of data lines are arranged in a crossing manner to define a plurality of pixel units; each pixel unit is also provided with a second gating transistor, the first pole of the second gating transistor is electrically connected with the pixel electrode, the second pole of the second gating transistor is electrically connected with the data line, and the grid electrode of the second gating transistor is electrically connected with the grid line;
the display device further comprises a first driving unit, and the first driving unit is used for providing pixel voltage signals with opposite positive and negative polarities for every two adjacent data lines in a line scanning period of a display stage of the touch display state.
Optionally, the display device further comprises a data selector, and the data line is electrically connected with the first driving unit through the data selector; the data selector includes: a plurality of third gate transistors corresponding to the plurality of data lines one to one, a first pole of each third gate transistor being electrically connected to the data line, and a second pole of each third gate transistor being electrically connected to the first driving unit;
the data selector also comprises a plurality of second control lines which are in one-to-one correspondence with the plurality of groups of data lines, and the grid electrode of the third gating transistor corresponding to the data lines in the same group is electrically connected with the same second control line.
The invention also provides a driving method applied to the display substrate, wherein the driving method comprises the following steps:
in a non-induction stage in a screen-off awakening state, sending the gating signal to the gating unit;
and sending the turn-off signal to the gating unit in a display stage in a touch display state.
Optionally, the driving method further includes:
in an induction stage in a screen-off awakening state and a touch stage in a touch display state, outputting a scanning signal to the common electrode layer and outputting a control signal to the gating unit, wherein the gating unit disconnects the corresponding pixel electrode from the common electrode under the control of the control signal;
wherein the scanning signal is a periodic signal switched between a first potential and a second potential; the control signal is a periodic signal that switches between a third potential and a fourth potential; the first potential is greater than the second potential, the third potential is greater than the fourth potential, and when the scanning signal is at the first potential, the control signal is at the third potential; when the scanning signal is at the second potential, the control signal is at a fourth potential.
Optionally, a voltage difference between the first potential and the second potential is the same as a voltage difference between the third potential and the fourth potential.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic partial structure diagram of a display substrate according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a partial circuit structure of a display device according to an embodiment of the invention;
FIG. 3a is a diagram illustrating voltages on a pixel electrode and a common electrode in the prior art;
FIG. 3b is a schematic diagram of voltages on the pixel electrode and the common electrode according to an embodiment of the present invention;
fig. 4 is a flowchart of a driving method according to an embodiment of the present invention;
fig. 5a is a voltage timing diagram in a touch display state according to an embodiment of the invention;
fig. 5b is a voltage timing diagram in the screen-off wake-up state according to an embodiment of the present invention.
Wherein the reference numerals include:
1. a gating unit; 11. a first gating transistor; 12. a gate line; 13R-13B, a data line; 14. a second gating transistor; 15. a third gating transistor; 16. a second control line; 2. a pixel electrode; 3. a common electrode; 31. a via hole; 4. a first control line; 5. a control module; 51. a control unit; 52. a first drive unit; 53. a second driving unit.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
The invention provides a display substrate which comprises a display area, wherein the display area is divided into a plurality of pixel units, a pixel electrode layer and a common electrode layer are arranged in the display area, and the pixel electrode layer comprises a plurality of pixel electrodes which correspond to the pixel units one by one. The common electrode layer comprises a plurality of common electrodes, each common electrode and at least one pixel electrode form a pixel capacitor, and the common electrodes are multiplexed as touch electrodes in the induction stage. Fig. 1 is a schematic partial structure diagram of a display substrate according to an embodiment of the present invention, and fig. 1 only shows a structure of one of the common electrodes and an electrical connection thereof. As shown in fig. 1, the display substrate further includes: the pixel driving circuit comprises a plurality of gating units 1 which are electrically connected with a plurality of pixel electrodes 2 in a one-to-one correspondence mode, wherein the gating units 1 are used for conducting the pixel electrodes 2 and a common electrode 3 which forms pixel capacitance with the pixel electrodes under the control of gating signals; the pixel electrode 2 and the common electrode 3 are disconnected under the control of the off signal.
In the embodiment of the present invention, the display substrate may include 2 working states, which are a touch display state and a screen-off wakeup state, respectively, where the touch display state refers to: the display substrate displays images, and the state of a touch position can be determined according to touch actions occurring on the display substrate; the screen-off wake-up state is as follows: the display substrate does not display images, waits for the awakening action, and enables the display substrate to enter a touch display state after the awakening action occurs. Each working cycle in the touch display state comprises a touch stage and a display stage, and each working cycle in the screen-off awakening state comprises an induction stage and a non-induction stage. The common electrode 3 may be configured to receive a reference voltage signal in a display stage in a touch display state and a non-sensing stage in a screen-off wake-up state, where the reference voltage signal may be a ground signal. The pixel electrode 2 may be used to receive a pixel voltage signal in a touch display state. Each common electrode 3 and the pixel electrodes 2 of 24 pixel units may form a pixel capacitor, and in a display stage in a touch display state, two ends of the pixel capacitor (the pixel electrode 2 and the common electrode 3) respectively receive a pixel voltage signal and a reference voltage signal, so that the pixel units display images of corresponding gray scales. The common electrode 3 can also receive the scanning signal at the touch stage in the touch display state and the sensing stage in the screen-off wake-up state, so that the scanning signal is multiplexed into the touch electrode at the touch stage in the touch display state and the sensing stage in the screen-off wake-up state. Each pixel electrode 2 is electrically connected with one gating unit 1, and the gating unit 1 can be used for receiving gating signals in a non-induction stage in a screen-off awakening state so as to conduct the pixel electrode 2 corresponding to the gating unit 1 and the common electrode 3; and receiving a turn-off signal in a display stage in a touch display state to disconnect the pixel electrode 2 and the common electrode 3 corresponding to the gating unit 1. It should be noted that the other common electrodes 3 and the corresponding pixel electrodes 2 can all adopt the same configuration, so that each pixel electrode 2 on the display substrate can be conducted through the gate unit 1 and the common electrode 3 forming the pixel capacitance therewith.
By adopting the display substrate provided by the embodiment of the invention, the pixel electrode 2 and the common electrode 3 can be switched on or off through the gating unit 1 according to actual needs, and when the pixel electrode 2 and the common electrode 3 are switched on, the pressure difference between the pixel electrode 2 and the common electrode 3 can be eliminated, so that the problem of continuous accumulation of the pressure difference between the pixel electrode 2 and the common electrode 3 is solved.
In some embodiments, the gating cell pack 1 includes a first gating transistor having a first pole electrically connected to the pixel electrode 2 and a second pole electrically connected to the common electrode 3, and a gate for receiving a gating signal or a turn-off signal.
Specifically, the second poles of the plurality of first gate transistors corresponding to the same common electrode 3 are connected by a signal line, and then electrically connected to the common electrode 3 through the via hole 31. In the embodiment of the present invention, the second poles of all the first gate transistors on the entire display substrate may be connected together through the signal line, so that the entire pixel electrode layer and the entire common electrode layer may be turned on through the plurality of first gate transistors. The display substrate further includes a first control line 4, and the gates of the plurality of first gate transistors are electrically connected to the first control line 4. The first control line 4 is used for providing a gating signal or a turn-off signal, the first gating transistor can be an N-type transistor or a P-type transistor, when the first gating transistor is the N-type transistor, the gating signal is a high-level signal, and the turn-off signal is a low-level signal; when the first gating transistor is a P-type transistor, the gating signal is a low-level signal, and the turn-off signal is a high-level signal.
In some embodiments, the common electrode 3 may be disposed in the same layer as the pixel electrode 2, or may be disposed in a layer with the pixel electrode 2, which is not limited herein. Preferably, in the embodiment of the present invention, the common electrode 3 and the pixel electrode 2 may be arranged in a layered manner, specifically, the common electrode 3 and the pixel electrode 2 are both arranged on a substrate, and an orthogonal projection of each common electrode 3 on the substrate covers an orthogonal projection of a plurality of pixel electrodes 2 on the substrate.
Based on the same inventive concept, the embodiment of the invention also provides a display device, which comprises a control unit and the display substrate. Fig. 2 is a schematic diagram of a partial circuit structure of a display device according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, a control unit 51 is electrically connected to a gating unit 1, and the control unit 51 is configured to: and in the non-induction stage in the screen-off awakening state, sending a gating signal to the gating unit 1. And sending a turn-off signal to the gating unit 1 at a display stage in a touch display state.
In the embodiment of the present invention, the control unit 51 includes a control terminal EN, and the gating unit 1 may be electrically connected to the control terminal EN of the control unit 51 through the first control line 4. Specifically, the gate unit 1 includes a first gate transistor 11, a first pole of the first gate transistor 11 is electrically connected to the pixel electrode 2, a second pole of the first gate transistor 11 is electrically connected to the common electrode 3, a gate of the first gate transistor 11 is electrically connected to a first control line 4, and the first control line 4 is electrically connected to the control unit 51. In the non-induction stage of the screen-off wake-up state, the control unit 51 may output a gating signal to the plurality of gating units 1, so that the plurality of gating units 1 are conducted with the corresponding pixel electrodes 2 and the common electrodes 3, thereby conducting the entire pixel electrode layer and the common electrode layer; in the display stage in the touch display state, the control unit 51 may output a turn-off signal to the plurality of gate units 1, so that the plurality of gate units 1 disconnect the pixel electrodes 2 and the common electrodes 3 corresponding thereto.
By adopting the display device provided by the embodiment of the invention, the gating signals can be output to the gating units 1 through the control unit 51 in the non-induction stage in the screen-off awakening state, so that the gating units 1 are communicated with the corresponding pixel electrodes 2 and the corresponding common electrodes 3, the whole pixel electrode layer is communicated with the common electrode layer, and the problem of pressure difference accumulation between the pixel electrodes 2 and the common electrodes 3 is solved; and in the display stage of the touch display state, a turn-off signal is output to the gating units 1, so that the gating units 1 are disconnected from the corresponding pixel electrodes 2 and the corresponding common electrodes 3, the pixel electrodes 2 and the common electrodes 3 are enabled to work normally, and the pixel electrodes 2 and the common electrodes 3 are prevented from interfering with each other to influence the display effect.
In some embodiments, the display device further includes a first driving unit 52. The display region is further provided with a plurality of gate lines 12 and a plurality of data lines, and the plurality of gate lines 12 and the plurality of data lines are arranged in a crossing manner to define a plurality of pixel units. The first driving unit 52 is configured to provide positive and negative pixel voltage signals to each two adjacent data lines in each row scanning period in the touch display state. A second gate transistor 14 is further disposed in each pixel unit, a first pole of the second gate transistor 14 is electrically connected to the pixel electrode 2, a second pole of the second gate transistor 14 is electrically connected to the data line, a gate of the second gate transistor 14 is electrically connected to the gate line 12, and each data line is electrically connected to the first driving unit 52.
Specifically, as shown in fig. 2, the first driving unit 52 and the control unit 51 may be integrated in the same control module 5, and the first driving unit 52 may be a source driving circuit. The pixel electrode 2 may be electrically connected to a first voltage output terminal Sx of the first driving unit 52, and the first driving unit 52 is configured to output pixel voltages to the plurality of data lines in a touch display state; the control module 5 may further include a second driving unit 53, the common electrode 3 may be electrically connected to a second voltage output terminal Tx of the second driving unit 53, and the second driving unit 53 is configured to output a reference voltage signal to the common electrode 3 in a display stage in a touch display state and a non-sensing stage in a screen-off wake-up state; and outputting scanning signals to the common electrode 3 at a touch control stage in a touch control display state and an induction stage in a screen-off awakening state. In the non-inductive stage in the screen-off wake-up state, the reference voltage signal may be a ground signal.
In some embodiments, the display device further includes a data selector (not shown), and the data line is electrically connected to the first driving unit 52 through the data selector. The data selector includes: and a plurality of third gate transistors 15 corresponding to the plurality of data lines one to one, a first pole of the third gate transistor 15 being electrically connected to the data lines, and a second pole of the third gate transistor 15 being electrically connected to the first driving unit 52. The plurality of data lines are divided into a plurality of groups, each group includes a plurality of data lines, the data selector further includes a second control line 16, and the gate of the third gating transistor 15 corresponding to the data line in the same group is electrically connected to the same second control line 16.
Specifically, the plurality of pixel units of the display substrate include a plurality of colors, e.g., red, green, and blue. The color of the pixel units in the same column is the same. The plurality of data lines can be divided into a plurality of groups according to the color of the pixel units corresponding to the data lines, that is, the pixel units corresponding to each group of data lines are the same color. The gates of the third gating transistors 15 corresponding to each group of data lines are electrically connected through the same second control line 16, for example, as shown in fig. 2, from left to right, the colors of the pixel units in each column are red, green, blue, red, green, and blue … … in sequence, and the first group of data lines may include a first data line 13R corresponding to a red pixel unit; the second group of data lines may include data lines 13G corresponding to green pixel cells; the third group of data lines may include data lines 13B corresponding to the blue pixel cells. The second control line 16 may include a control line MUXR, a control line MUXG, and a control line MUXB, the gate of the third gating transistor 15 corresponding to the first data line 13R is electrically connected to the control line MUXR, the gate of the third gating transistor 15 corresponding to the second data line 13G is electrically connected to the control line MUXG, and the gate of the third gating transistor 15 corresponding to the third data line 13B is electrically connected to the control line MUXB. In the entire touch display state, the plurality of gate lines 12 may sequentially provide the first driving signal to the second gate transistor 14 to sequentially turn on the plurality of rows of pixel electrodes 2 with their corresponding data lines, and the plurality of second control lines 16 may sequentially output the second driving signal to the third gate transistor 15 to sequentially turn on the plurality of groups of data lines with the first driving unit 52 in one row scanning period. When the second gate transistor 14 and the third gate transistor 15 corresponding to the pixel unit are both turned on, the pixel unit may receive the pixel voltage signal output by the first driving unit 52. The second gate transistor 14 (third gate transistor 15) may be an N-type transistor or a P-type transistor, and when the second gate transistor 14 (third gate transistor 15) is an N-type transistor, the first driving signal (second driving signal) is a high level signal; when the second gate transistor 14 (third gate transistor 15) is a P-type transistor, the first drive signal (second drive signal) is a low level signal.
Fig. 3a is a schematic diagram of voltages on a pixel electrode and a common electrode in the prior art, and fig. 3b is a schematic diagram of voltages on the pixel electrode and the common electrode in the embodiment of the present invention, as shown in fig. 3a and fig. 3b, in the prior art, since the voltages on the common electrode and the pixel electrode are not consistent in a non-sensing stage, a voltage difference is accumulated between the common electrode and the pixel electrode, which causes display defects such as liquid crystal polarization and uneven brightness. By adopting the display device provided by the embodiment of the invention, the voltages on the common electrode and the pixel electrode are kept consistent in a non-induction stage, the pressure difference accumulation between the common electrode and the pixel electrode is avoided, the defects of liquid crystal polarization, uneven brightness and the like of the display device caused by the pressure difference accumulation are prevented, and the display effect of the display device is improved.
Based on the same inventive concept, an embodiment of the present invention further provides a driving method applied to the display substrate, and fig. 4 is a flowchart of the driving method provided by the embodiment of the present invention, and as shown in fig. 4, the driving method includes:
s1, sending a gating signal to a gating unit in a non-induction stage in a screen-off awakening state.
And S2, sending a turn-off signal to the gating unit in a display stage in a touch display state.
Specifically, the display substrate may include 2 working states, which are a touch display state and a screen-off wake-up state, respectively, where the touch display state includes a touch stage and a display stage, and the screen-off wake-up state includes an induction stage and a non-induction stage. Specifically, in the non-induction stage in the screen-off wake-up state, a grounding signal can be output to a common electrode of the display substrate, the pixel electrode is suspended, and meanwhile, a gating signal is output to the gating units, so that the gating units are conducted with the corresponding pixel electrode and the common electrode, the whole pixel electrode layer is conducted with the common electrode layer, and the voltage difference between the pixel electrode and the common electrode is eliminated; in the induction stage in the screen-off awakening state, a scanning signal can be output to the common electrode of the display substrate, so that the common electrode is reused as a touch electrode. In a display stage in a touch display state, turn-off signals can be output to the plurality of gating units, so that the plurality of gating units disconnect the corresponding pixel electrodes and the corresponding common electrodes, and meanwhile, reference voltage signals are output to the common electrodes of the display substrate and pixel voltage signals are output to the pixel electrodes, so that liquid crystal molecules in the pixel units are deflected according to the reference voltage signals and the pixel voltage signals, and corresponding images are displayed. In the touch control stage in the touch control display state, a scanning signal can be output to the common electrode of the display substrate, so that the common electrode is multiplexed as a touch control electrode.
By adopting the driving method of the display substrate provided by the embodiment of the invention, the pixel electrode and the common electrode can be conducted at the non-induction stage in the screen-off awakening state, and the voltage difference between the pixel electrode and the common electrode is eliminated; and in the display stage under the touch display state, the gating units are disconnected from the corresponding pixel electrodes and the corresponding common electrodes, so that the common electrodes and the pixel electrodes can be recovered to normal work, and the display effect is prevented from being influenced due to mutual interference of the pixel electrodes and the common electrodes.
Fig. 5a is a voltage timing diagram in a touch display state according to an embodiment of the present invention, and fig. 5b is a voltage timing diagram in a screen-off wake-up state according to an embodiment of the present invention, and as shown in fig. 5a and fig. 5b, the driving method further includes: and in the induction stage in the screen-off awakening state and the touch control stage in the touch control display state, outputting a scanning signal to the common electrode layer and outputting a control signal to the gating unit, wherein the gating unit disconnects the corresponding pixel electrode from the common electrode under the control of the control signal. Therefore, even if the second poles of all the first gating transistors can be connected together through the signal line, the pixel electrode and the common electrode can be kept disconnected in a touch control stage and an induction stage through the control of the control signal, so that the touch control induction effect is ensured.
The scanning signal is a periodic signal switched between a first potential V1 and a second potential V2. The control signal is a periodic signal that switches between the third potential V3 and the fourth potential V4. The first potential V1 is greater than the second potential V2, the third potential V3 is greater than the fourth potential V4, and when the scanning signal is at the first potential V1, the control signal is at the third potential V3, and when the scanning signal is at the second potential V2, the control signal is at the fourth potential V4. Further, the differential pressure between the first potential V1 and the second potential V2 is the same as the differential pressure between the third potential V3 and the fourth potential V4.
Specifically, as shown in fig. 5a and 5b, the timing sequence of the control signal and the scanning signal output in the above manner is the same, and the voltage difference between the two potentials of the control signal is the same as the voltage difference between the two potentials of the scanning signal, so that the voltage difference between the control line and the signal line outputting the scanning signal can be kept consistent, and the parasitic capacitance charging effect between the newly added control line and the signal line outputting the scanning signal is avoided. In the embodiment of the present invention, it is only necessary to make the differential voltage between the first potential V1 and the second potential V2 and the differential voltage between the third potential V3 and the fourth potential V4 be the same, and it is not necessary to make the values of the first potential V1 (the second potential V2) and the third potential V3 (the fourth potential V4) the same. The gating unit comprises a first gating transistor, the first gating transistor can be an N-type transistor or a P-type transistor, and when the first gating transistor is the N-type transistor, the gating signal is a high-level signal, and the potential of the gating signal is V5; the turn-off signal is a low level signal, and the potential of the turn-off signal can be a second potential V2; at this time, the third potential V3 is less than the potential V5 of the gate signal; when the first gating transistor is a P-type transistor, the gating signal is a low-level signal, the turn-off signal is a high-level signal, and the potential of the control signal is greater than that of the gating signal.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (9)
1. A display substrate comprises a display area, wherein the display area is divided into a plurality of pixel units, a pixel electrode layer and a common electrode layer are arranged in the display area, and the pixel electrode layer comprises a plurality of pixel electrodes which are in one-to-one correspondence with the pixel units; the common electrode layer comprises a plurality of common electrodes, each common electrode and at least one pixel electrode form a pixel capacitor, and the common electrodes are multiplexed into touch electrodes in an induction stage; it is characterized in that the preparation method is characterized in that,
the display substrate further includes:
a data line;
the gating units are electrically connected with the pixel electrodes in a one-to-one correspondence mode and used for conducting the pixel electrodes and the common electrodes forming pixel capacitors with the pixel electrodes under the control of gating signals; under the control of a turn-off signal, disconnecting the pixel electrode and the common electrode;
the gating unit comprises a first gating transistor and a second gating transistor, wherein a first pole of the first gating transistor is electrically connected with the pixel electrode, a second pole of the first gating transistor is electrically connected with the common electrode, and a grid electrode of the first gating transistor is used for receiving the gating signal or the turn-off signal; wherein the data line and the pixel electrode are connected through the second gating transistor;
and second poles of a plurality of first gating transistors corresponding to the same common electrode are connected through signal lines and then electrically connected with the common electrode through via holes.
2. The display substrate according to claim 1, wherein the display substrate further comprises a first control line, and the gates of the plurality of first gate transistors are electrically connected to the first control line.
3. The substrate according to any one of claims 1-2, wherein the common electrode and the pixel electrode are disposed on a substrate, and an orthogonal projection of each of the common electrodes on the substrate covers an orthogonal projection of a plurality of the pixel electrodes on the substrate.
4. A display device comprising a control unit and the display substrate of any one of claims 1 to 3, wherein the control unit is electrically connected to the gate unit, and the control unit is configured to:
in a non-induction stage in a screen-off awakening state, sending the gating signal to the gating unit; and the number of the first and second groups,
and sending the turn-off signal to the gating unit in a display stage in a touch display state.
5. The display device according to claim 4, wherein the display region is further provided with a plurality of gate lines and a plurality of data lines, the plurality of gate lines and the plurality of data lines being arranged to cross each other to define a plurality of the pixel units; each pixel unit is also provided with a second gating transistor, the first pole of the second gating transistor is electrically connected with the pixel electrode, the second pole of the second gating transistor is electrically connected with the data line, and the grid electrode of the second gating transistor is electrically connected with the grid line;
the display device further comprises a first driving unit, and the first driving unit is used for providing pixel voltage signals with opposite positive and negative polarities for every two adjacent data lines in a line scanning period of a display stage of a touch display state.
6. The display device according to claim 5, further comprising a data selector through which the data line is electrically connected to the first driving unit; the data selector includes: a plurality of third gate transistors corresponding to the plurality of data lines one to one, a first pole of each third gate transistor being electrically connected to the data line, and a second pole of each third gate transistor being electrically connected to the first driving unit;
the data selector also comprises a plurality of second control lines which are in one-to-one correspondence with the plurality of groups of data lines, and the grid electrodes of the third gating transistors corresponding to the data lines in the same group are electrically connected with the same second control lines.
7. A driving method applied to the display substrate according to any one of claims 1 to 3, wherein the driving method comprises:
in a non-induction stage in a screen-off awakening state, sending the gating signal to the gating unit;
and sending the turn-off signal to the gating unit in a display stage in a touch display state.
8. The driving method according to claim 7, further comprising:
in an induction stage in a screen-off awakening state and a touch stage in a touch display state, outputting a scanning signal to the common electrode layer and outputting a control signal to the gating unit, wherein the gating unit disconnects the corresponding pixel electrode from the common electrode under the control of the control signal;
wherein the scanning signal is a periodic signal switched between a first potential and a second potential; the control signal is a periodic signal that switches between a third potential and a fourth potential; the first potential is larger than the second potential, the third potential is larger than the fourth potential, and when the scanning signal is at the first potential, the control signal is at the third potential; when the scanning signal is at the second potential, the control signal is at a fourth potential.
9. The driving method according to claim 8, characterized in that a differential pressure between the first potential and the second potential and a differential pressure between the third potential and the fourth potential are the same.
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| KR20100075328A (en) * | 2008-12-24 | 2010-07-02 | 엘지디스플레이 주식회사 | Touch type liquid crystal display device |
| CN102043270B (en) * | 2009-10-26 | 2012-07-25 | 上海天马微电子有限公司 | Touch control type liquid crystal display device |
| KR101735386B1 (en) * | 2010-06-25 | 2017-05-30 | 엘지디스플레이 주식회사 | Liquid crystal display device having touch sensor embedded therein, method for driving the same and method for fabricating the same |
| US9513753B2 (en) * | 2011-12-19 | 2016-12-06 | Sharp Kabushiki Kaisha | Touch-sensor-embedded display panel, display device provided therewith, and method for driving touch-sensor-embedded display panel |
| CN102967974B (en) * | 2012-11-08 | 2016-03-30 | 京东方科技集团股份有限公司 | A kind of array base palte, display device and refreshing frequency control method |
| CN104280920A (en) * | 2014-10-17 | 2015-01-14 | 深圳市华星光电技术有限公司 | Touch screen integrated liquid crystal display panel and liquid crystal display device |
| CN104699313B (en) * | 2015-04-01 | 2018-05-01 | 上海天马微电子有限公司 | Touch panel and display device |
| CN104765507B (en) * | 2015-05-08 | 2018-06-05 | 上海天马微电子有限公司 | Filter circuit and touch display device |
| CN205334410U (en) * | 2015-12-03 | 2016-06-22 | 深圳磨石科技有限公司 | Touch display apparatus and electronic equipment |
| CN105511707B (en) * | 2016-01-29 | 2018-06-22 | 上海中航光电子有限公司 | Touch-control display panel |
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