CN111258454A - Touch display device and discharging method thereof - Google Patents
Touch display device and discharging method thereof Download PDFInfo
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- CN111258454A CN111258454A CN202010045722.4A CN202010045722A CN111258454A CN 111258454 A CN111258454 A CN 111258454A CN 202010045722 A CN202010045722 A CN 202010045722A CN 111258454 A CN111258454 A CN 111258454A
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- 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
- G06F3/0412—Digitisers structurally integrated in a display
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- 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
- G06F3/0416—Control or interface arrangements specially adapted for digitisers
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Abstract
A touch display device and a discharging method thereof are provided. The touch display device has a display mode and a touch wake-up mode, and comprises a first substrate, a second substrate and a third substrate, wherein the first substrate is provided with a plurality of pixel units, and each pixel unit comprises a thin film transistor and is provided with a source electrode, a drain electrode and a grid electrode; the pixel electrode is electrically connected to the source electrode of the thin film transistor; a plurality of data lines electrically connected to the drain electrodes of the thin film transistors, respectively; a plurality of gate lines electrically connected to the gates of the thin film transistors, respectively; the touch control device comprises a plurality of touch control electrodes, a plurality of touch control electrodes and a plurality of touch control units, wherein each touch control electrode corresponds to a plurality of pixel units; a plurality of traces electrically connected to the touch electrodes, respectively; in the touch wake-up mode, the touch electrodes, the data lines and the gate lines are all electrically connected to a same potential.
Description
Technical Field
The present invention relates to a touch display device and a discharging method thereof, and more particularly, to a touch display device having a touch wake-up mode and a discharging method thereof.
Background
With the development of technology, display devices are widely used in many electronic products, such as mobile phones, tablet computers, watches, and the like. In order to improve the display quality, large-sized, high-resolution, high-brightness touch display devices have been developed.
The touch display device is in a black screen state when not used for a long time, the touch electrode needs to input a scanning signal periodically to detect whether a touch action occurs, and when the touch action occurs, the touch display device is switched to a normal display mode. Before the switching operation, the charges remaining in the pixel units in the touch display device need to be discharged and cleared. A common discharge method is to turn on the tfts in all the pixel cells and connect the sources of the tfts to ground, thereby discharging the remaining charges. If the thin film transistor is accidentally turned on, a leakage path is formed by the thin film transistor, and the gate line charges the data line and the pixel, so that the touch display device has residual shadows.
Therefore, how to effectively discharge the pixel units of the touch display device, eliminate the residual charges in the pixel units, avoid the occurrence of residual images in the touch display device, and improve the display quality is one of the issues to be overcome.
Disclosure of Invention
The invention provides a touch display device and a discharging method thereof, which can realize effective discharging of pixel units of the touch display device, eliminate residual charges in the pixel units, avoid the occurrence of residual shadows of the touch display device and improve the display quality.
The touch control display device provided by the embodiment of the invention has a display mode and a touch control awakening mode, and comprises a first substrate, a plurality of pixel units and a plurality of display units, wherein the pixel units respectively comprise: a thin film transistor having a source, a drain and a gate; a pixel electrode electrically connected to the source of the thin film transistor; a plurality of data lines disposed on the first substrate, the plurality of data lines being electrically connected to the drains of the thin film transistors, respectively; a plurality of gate lines disposed on the first substrate, the plurality of gate lines being electrically connected to the gates of the thin film transistors, respectively; the touch control electrodes are arranged on the first substrate, and each touch control electrode corresponds to a plurality of pixel units; a plurality of traces disposed on the first substrate, the plurality of traces being electrically connected to the touch electrodes, respectively; in the touch wake-up mode, the touch electrodes, the data lines and the gate lines are all electrically connected to a same potential.
In an embodiment of the present invention, a discharging method of a touch display device, where the touch display device has a display mode and a touch wake-up mode, includes: a first substrate having a plurality of pixel units, each of the pixel units comprising: a thin film transistor having a source, a drain and a gate; a pixel electrode electrically connected to the source of the thin film transistor; a plurality of data lines disposed on the first substrate, the plurality of data lines being electrically connected to the drains of the thin film transistors, respectively; a plurality of gate lines disposed on the first substrate, the plurality of gate lines being electrically connected to the gates of the thin film transistors, respectively; the touch control electrodes are arranged on the first substrate, and each touch control electrode corresponds to a plurality of pixel units; a plurality of traces disposed on the first substrate, the plurality of traces being electrically connected to the touch electrodes, respectively; the discharge method includes: and under the touch control awakening mode, providing a touch control awakening signal with the same potential to the touch control electrodes, the data lines and the gate lines.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1A is a schematic structural diagram of a touch display device according to an embodiment of the invention.
Fig. 1B is a schematic structural diagram of the pixel unit in fig. 1A.
Fig. 2A is a timing diagram of driving signals in a touch wake-up mode of a touch display device according to the prior art.
Fig. 2B is a timing diagram of driving signals in a touch wake-up mode of the touch display device according to an embodiment of the invention.
Wherein, the reference numbers:
100: touch control display device
101: first substrate
GOA: gate drive circuit
IC: control circuit
PX: pixel unit
A TFT: thin film transistor
M1: a first thin film transistor
M2: second thin film transistor
G: grid electrode
D: drain electrode
S: source electrode
PE: pixel electrode
DL: data line
TL: track line
GL: gate line
TP: touch electrode
CG: control wire
AVDD: high potential of system
GND: ground potential
Detailed Description
The invention will be described in detail with reference to the following drawings, which are provided for illustration purposes and the like:
fig. 1A is a schematic structural diagram of a touch display device according to an embodiment of the invention. Fig. 1B is a schematic structural diagram of the pixel unit in fig. 1A. As shown in fig. 1A and fig. 1B, the touch display device 100 of the present invention has a display mode and a touch wake-up mode, wherein the touch display device 100 is in the touch wake-up mode when it is in a black screen, and has repeated detection periods and discharge periods, and the touch display device 100 is in the display mode after being touched. Specifically, the touch display device 100 includes a first substrate 101 and a second substrate (not shown), and the second substrate is disposed opposite to the first substrate 101. The first substrate 101 is provided with a display area AA, and the display area AA has a plurality of pixel units PX arranged in a matrix. Each pixel unit PX includes a thin film transistor TFT having a source S, a drain D, and a gate G, and a pixel electrode PE electrically connected to the source S of the thin film transistor TFT. The first substrate 101 is further provided with a plurality of data lines DL, a plurality of gate lines GL, a plurality of touch electrodes TP, and a plurality of traces TL. Specifically, the plurality of data lines DL are electrically connected to the drain electrodes D of the thin film transistors TFT, respectively, for providing driving signals to the pixel units PX, the plurality of gate lines GL are electrically connected to the gate electrodes G of the thin film transistors TFT, respectively, the plurality of traces TL are electrically connected to the touch electrodes TP, respectively, and each touch electrode TP corresponds to a plurality of pixel units PX in a projection direction perpendicular to the first substrate 101. In the present embodiment, when the touch display device 100 is in the touch wake-up mode, during the discharging period, the residual charges in the pixel units PX need to be removed, and at this time, the touch electrodes TP, the data lines DL and the gate lines GL of the touch display device 100 are all set to the same potential, such as the ground potential GND.
As shown in fig. 1A and 1B, the thin film transistor TFT in the pixel unit PX may be one, or may be formed by connecting the first thin film transistor M1 and the second thin film transistor M2 in series. When the TFTs are two TFTs connected in series, the data line DL is electrically connected to the drain D of the first TFT M1, the pixel electrode PE is electrically connected to the source S of the second TFT M2, and the gate line GL is electrically connected to the gate G of the first TFT M1 and the second TFT M2.
In addition, as shown in fig. 1A, the touch display device 100 further includes a gate driving circuit GOA and a control circuit IC. The gate driving circuit GOA is electrically connected to the pixel unit PX through a plurality of gate lines GL, and provides a driving signal to the pixel unit PX. The gate driving circuit GOA has a plurality of input terminals (not shown), the input terminals of the gate driving circuit GOA are electrically connected to the control circuit IC through the control line CG, and the control circuit IC provides control signals, such as U2D/D2U, STV/VEND, CLK/XCLK, RST, XDONB, GOFF, etc., to the gate driving circuit GOA through the control line CG. When the touch display device 100 is in the discharging period of the touch wake-up mode, the control line CG, i.e. the plurality of input terminals of the gate driving circuit GOA, are also set to be electrically connected to the ground GND. When the touch display device 100 is touched and in the display mode, the control line CG, i.e. a plurality of input terminals of the gate driving circuit GOA, are electrically connected to the system high voltage AVDD or the first low voltage AVEE, so that the gate driving circuit GOA provides a driving signal to the pixel unit PX under the control of the system high voltage AVDD or the first low voltage AVEE to drive the pixel unit PX to perform normal display. The first low potential AVEE and the ground potential GND are different potentials. For the touch electrode TP, when the touch display device 100 is in the touch wake-up mode, the control circuit IC provides the same potential, such as the ground potential GND, as the data line DL and the gate line GL to the touch electrode through the electrically connected trace line TL. When the touch display device 100 is in the display mode, the control circuit IC supplies the common potential Vcom to the touch electrode TP through the trace TL.
Fig. 2A is a timing diagram of a driving signal of a touch wake-up mode of a touch display device according to the prior art. Fig. 2B is a timing diagram of a driving signal of a touch wake-up mode of a touch display device according to an embodiment of the invention. Referring to fig. 1A, 1B and 2A, in the prior art, when the pixel unit PX of the touch display device 100 is discharged during the discharge period of the touch display device 100 in the touch wake-up mode, the data line DL and the trace line TL in the touch display device 100 are both set to the ground potential GND, and the gate line GL is set to the system high potential AVDD. Taking the thin film transistor TFT as an N-type, at this time, the system high voltage AVDD turns on the thin film transistor TFT to form a conductive path between the source S and the drain D of the thin film transistor TFT, and since both the source S and the drain D are electrically connected to the ground GND, the charges remaining in the pixel unit PX can be discharged. Referring to fig. 1B again, when the TFT is accidentally turned on, that is, the gate G and the source S and the gate G and the drain D of the TFT are turned on, at this time, the gate G is electrically connected to the system high voltage AVDD, the source S and the drain D are electrically connected to the ground GND, the gate G and the source S and the drain D form a potential difference therebetween, the system high voltage AVDD charges the pixel electrode PE and the data line DL, and the pixel units PX connected to the same data line TL are all lit up to generate a bright line ghost. The longer the discharge period is, the longer the charging time of the system high voltage AVDD to the pixel electrode PE and the data line DL is, and the more serious the bright line afterimage is due to the dc residue generated when the polarity of the pixel electrode PE is not inverted.
To solve the problem of image sticking, referring to fig. 2B, when the pixel unit PX of the touch display device 100 is discharged during the discharging period, the data line DL, the trace line TL, and the gate line GL in the touch display device 100 are set to the ground potential GND. In this case, the ground GND does not turn on the TFT to turn off the TFT, a conductive path is not formed between the source S and the drain D, and even if the TFT is accidentally turned on, the gate G and the drain D are electrically connected to the ground GND, so that the residual charges in the pixel electrode PE can be discharged to the ground.
With continued reference to fig. 2A and 2B, fig. 2A and 2B only show the signal potentials of the data line DL, the trace line TL, and the gate line GL, and the following table explains the control signal at each input terminal of the gate driving circuit GOA in the touch display device 100.
Watch 1
As shown in table i, when the touch display device 100 is in the display mode, the control line CG, i.e., the plurality of input terminals of the gate driving circuit GOA, are electrically connected to the system high voltage level AVDD or the first low voltage level AVEE, so that the gate driving circuit GOA provides the driving signal to the pixel unit PX under the control of the system high voltage level AVDD or the first low voltage level AVEE, and drives the pixel unit PX to perform normal display. The potential of the system high potential AVDD may be set to 8.5v, for example, and the potential of the first low potential AVEE may be set to-8 v, for example.
As shown in table i, when the touch display device 100 is in the discharging period of the touch wake-up mode, the control line CG, i.e., the plurality of input terminals of the gate driving circuit GOA, are set to be electrically connected to the ground GND, and one of the input terminals GOFF is electrically connected to the system high voltage AVDD. The potential of the system high potential AVDD may be set to 5.5v, for example, and the potential of the first low potential AVEE may be set to-5.5 v, for example.
The invention also provides a method for discharging the touch display device shown in fig. 1A. When the touch display device 100 is in the touch wake-up mode, during the discharging period, the control circuit IC and the gate driving circuit GOA respectively provide the touch wake-up signals to the touch electrode TP, the data line DL and the gate line GL to discharge the pixel unit PX. Specifically, the touch wake-up signals respectively provided to the touch electrode TP, the data line DL and the gate line GL are at the same potential, for example, the ground potential GND.
In summary, by setting the touch electrode, the data line and the gate line of the touch display device to the same potential, for example, the ground potential GND, effective discharge of the pixel unit of the touch display device can be realized, the residual charges in the pixel unit can be eliminated, the occurrence of the afterimage of the touch display device can be avoided, and the display quality can be improved.
The present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it should be understood that various changes and modifications can be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (11)
1. A touch control display device having a display mode and a touch wake-up mode, comprising:
a first substrate having a plurality of pixel units, each of the pixel units comprising:
a thin film transistor having a source, a drain and a gate;
a pixel electrode electrically connected to the source of the thin film transistor;
a plurality of data lines disposed on the first substrate, the plurality of data lines being electrically connected to the drains of the thin film transistors, respectively;
a plurality of gate lines disposed on the first substrate, the plurality of gate lines being electrically connected to the gates of the thin film transistors, respectively;
the touch control electrodes are arranged on the first substrate, and each touch control electrode corresponds to a plurality of pixel units;
a plurality of traces disposed on the first substrate, the plurality of traces being electrically connected to the touch electrodes, respectively;
in the touch wake-up mode, the touch electrodes, the data lines and the gate lines are all electrically connected to a same potential.
2. The touch display device of claim 1, wherein the same potential is ground potential.
3. The touch display device of claim 1, wherein the thin film transistor comprises a first thin film transistor and a second thin film transistor connected in series.
4. The touch display device of claim 3, wherein the data line is electrically connected to the drain of the first thin film transistor.
5. The touch display device of claim 3, wherein the pixel electrode is electrically connected to the source of the second thin film transistor.
6. The touch display device of claim 3, wherein the gate line is electrically connected to the gates of the first thin film transistor and the second thin film transistor.
7. The touch display device of claim 1, further comprising a gate driving circuit electrically connected to the gate lines, wherein the gate driving circuit has a plurality of input terminals, and in the touch wake-up mode, the plurality of input terminals of the gate driving circuit are all at ground potential or a first high potential.
8. The touch display device according to claim 7, wherein in the display mode, the input terminals of the gate driving circuit are electrically connected to the first high potential or a first low potential, and the first low potential is different from a ground potential.
9. The touch display device of claim 1, further comprising a control circuit electrically connected to the traces, the control circuit providing the common potential to the traces in the touch wake-up mode and providing a common potential to the traces in the display mode.
10. A discharging method of a touch display device, the touch display device having a display mode and a touch wake-up mode, the touch display device comprising:
a first substrate having a plurality of pixel units, each of the pixel units comprising:
a thin film transistor having a source, a drain and a gate;
a pixel electrode electrically connected to the source of the thin film transistor;
a plurality of data lines disposed on the first substrate, the plurality of data lines being electrically connected to the drains of the thin film transistors, respectively;
a plurality of gate lines disposed on the first substrate, the plurality of gate lines being electrically connected to the gates of the thin film transistors, respectively;
the touch control electrodes are arranged on the first substrate, and each touch control electrode corresponds to a plurality of pixel units;
a plurality of traces disposed on the first substrate, the plurality of traces being electrically connected to the touch electrodes, respectively;
characterized in that the discharge method comprises:
and under the touch control awakening mode, providing a touch control awakening signal with the same potential to the touch control electrodes, the data lines and the gate lines.
11. The discharging method according to claim 10, wherein the touch wake-up signal is a ground signal.
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| CN202010045722.4A CN111258454B (en) | 2020-01-15 | 2020-01-15 | Touch display device and discharging method thereof |
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| CN202010045722.4A CN111258454B (en) | 2020-01-15 | 2020-01-15 | Touch display device and discharging method thereof |
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| CN104699313A (en) * | 2015-04-01 | 2015-06-10 | 上海天马微电子有限公司 | Touch panel and display device |
| CN204719368U (en) * | 2015-05-08 | 2015-10-21 | 厦门天马微电子有限公司 | Contactor control device |
| CN105068694A (en) * | 2015-09-07 | 2015-11-18 | 上海天马微电子有限公司 | Touch control display panel and drive method of touch control display panel |
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