CN111381701B - Touch control display device - Google Patents
Touch control display device Download PDFInfo
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- CN111381701B CN111381701B CN201811617296.6A CN201811617296A CN111381701B CN 111381701 B CN111381701 B CN 111381701B CN 201811617296 A CN201811617296 A CN 201811617296A CN 111381701 B CN111381701 B CN 111381701B
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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
Abstract
A touch display device comprises a touch display panel, a plurality of grid lines and a plurality of touch electrodes, wherein the touch display panel comprises a plurality of pixel units and a plurality of touch electrodes; a plurality of traces extending along a second direction, the plurality of traces coupled to the plurality of touch electrodes; a gate driving circuit, including a first set of driving circuits and a second set of driving circuits, coupled to the gate lines and the traces, for driving the pixel units and the touch electrodes; and a back-scanning circuit respectively coupled between the first group of driving circuits and the second group of driving circuits. The touch display device of the invention adopts the grid drive circuit shared by the grid lines and the traces, so that the occupied area of the lines can be reduced, the fan-out design can be simplified, the product size can be reduced, and the production cost can be reduced.
Description
Technical Field
The present invention relates to a display device, and more particularly, to a touch display device including touch electrodes.
Background
With the development of technology, touch display devices are applied to many electronic products, such as mobile phones, tablet computers, watches, etc., and often the touch display devices are combined with a display panel for use. Currently, many manufacturers have proposed techniques for integrating touch devices into display panels. Compared with the touch device which is attached to the outer side of the display panel, the touch device is integrated with the display panel, so that the overall thickness of the product can be reduced.
Fig. 1 is a schematic structural diagram of a conventional touch display device. As shown in fig. 1, the touch display device 100 includes a control unit 110 and a display panel 120. The display panel 120 further includes a pixel array 130, a first gate circuit (e.g., the first gate driving circuit 140), a second gate circuit (e.g., the second gate driving circuit 150), and a touch electrode 160. In addition, the touch display device further includes a plurality of data lines (e.g., S1-Sn) and a plurality of traces (e.g., T1-Tn), which are required to be connected to the control unit 110 from below the display panel 120 along a vertical direction, as shown by the oval areas in the figure. Assuming that there are m touch electrodes 160 arranged in the horizontal direction and n touch electrodes 160 arranged in the vertical direction, the total number of touch electrodes 160 is m × n, and then m × n traces transmit the touch signals to the control unit 110. Assuming that m is 18 and n is 32, the total number of traces is 18 x 32 and 576.
The existing touch display device often increases the output circuit of the touch electrode to the control circuit, increases the area occupied by the control circuit, increases the circuit design difficulty of the circuit part, increases the product size and improves the production cost.
Disclosure of Invention
The invention provides a touch display device which can reduce the occupied area of circuits, simplify the fan-out design, reduce the size of a product and reduce the production cost.
The invention discloses a touch display device, which comprises a touch display panel, a plurality of touch control display panels and a plurality of touch control display panels, wherein the touch control display panel comprises a plurality of pixel units and a plurality of touch control electrodes, the pixel units are arranged in a plurality of rows along a first direction, and are arranged in a plurality of lines along a second direction, and the position of each touch control electrode corresponds to the pixel units; a plurality of gate lines disposed on the touch display panel and coupled to the pixel units respectively; a plurality of traces disposed on the touch display panel and arranged to extend along the second direction, wherein the plurality of traces are coupled to the plurality of touch electrodes; a gate driving circuit, including a first set of driving circuits and a second set of driving circuits, and the first set of driving circuits and the second set of driving circuits respectively include multi-stage shift registers, the gate driving circuit is coupled to the gate lines and the traces for driving the pixel units and the touch electrodes; and a back-scanning circuit respectively coupled between the first group of driving circuits and the second group of driving circuits.
The invention discloses a touch display device, which comprises a touch display panel, a touch control panel and a control unit, wherein the touch display panel comprises a plurality of pixel units and a plurality of touch control electrodes, the pixel units are arranged in a plurality of rows along a first direction and a plurality of columns along a second direction, and the position of each touch control electrode corresponds to the pixel units; a plurality of gate lines disposed on the touch display panel and coupled to the pixel units respectively; a plurality of traces disposed on the touch display panel and arranged to extend along the second direction, wherein the plurality of traces are coupled to the plurality of touch electrodes; a gate driving circuit, including a first group of driving circuits and a second group of driving circuits, and the first group of driving circuits and the second group of driving circuits respectively include multi-stage shift registers, the gate driving circuit is coupled to the gate lines and the traces for driving the pixel units and the touch electrodes; the flyback circuit is respectively coupled between the first group of driving circuits and the second group of driving circuits, and is electrically connected with a first control signal and a second control signal. In a display period, the first control signal is an enable (enable) potential, and the second control signal is a disable (disable) potential; during a touch control period, the second control signal is an enable potential, and the first control signal is a disable potential.
The invention is described in detail below with reference to the drawings and specific examples, but the invention is not limited thereto.
Drawings
Fig. 1 is a schematic structural diagram of a conventional touch display device.
Fig. 2 is a schematic structural diagram of a touch display device according to an embodiment of the invention.
Fig. 3 is a schematic structural diagram of a gate driving circuit according to an embodiment of the invention.
Fig. 4 is a schematic diagram of a touch control circuit structure according to an embodiment of the invention.
FIG. 5 is a timing diagram illustrating control signal switching according to an embodiment of the present invention.
Fig. 6 is a schematic structural diagram of a touch display device according to another embodiment of the invention.
Fig. 7 is a schematic structural diagram of a touch display device according to still another embodiment of the invention.
Wherein, the reference numbers:
100. 200: touch display device 110, 210: control unit
120. 220, and (2) a step of: display panel 130, 230: pixel array
140: the first gate circuit 150: second gate circuit
240: first set of driver circuits 250: second group of driving circuits
160. 260: the touch electrode 270: touch control circuit
280. 280', 280 ": the flyback circuit 281: first switch unit
282: the second switching unit 283: third switch unit
284: fourth switching unit 285: fifth switch unit
286: the sixth switching unit 287: seventh switching unit
288: eighth switch unit
CS 1-1 to CS 1-8, CS 2-1 to CS 2-8: control circuit
CT 11-CTmn: contact point
And DSR: virtual shift register
G1-G4, G1-G1-8, G2-1-G2-8, G n-1-G n-4: gate line
GOA: gate drive circuit
S1-SN: data line
SR 1-1-SR 1-8, SR 2-1-SR 2-8, SRn-1-SRn-4: shift register
T1-TN, TL 1-TLN, TL 1-TL 1-4, TL n-1-TL n-4: track line
TP _ PAD1 to TP _ PADn: 1 st to n th row touch control electrode
DSW, TSW, TPCOM, DCOM, VGL: control signal
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. 2 is a schematic structural diagram of a touch display device according to an embodiment of the invention. As shown in fig. 2, in the present embodiment, the touch display device 200 includes a control unit 210 and a display panel 220. The display panel 220 further includes a pixel array 230 and a gate driver GOA. In the present embodiment, the control unit 210 may include a data driving circuit for providing image data voltages to the pixel array 230 for display. In addition, the control unit 210 may perform touch control as receiving touch data. However, the present invention is not limited thereto. For example, the control unit 210 may be a timing controller or be configured in the timing controller to provide various control signals to the gate driving circuit GOA, the data driving circuit or the pixel array 230.
Specifically, in the present embodiment, the pixel array 230 has a plurality of pixel units (not shown), a plurality of gate lines (e.g., gate lines G1-GN), and the pixel units are controlled by the corresponding gate lines to control the circuit operation of the pixel array 230.
In the embodiment of the invention, a person skilled in the art can determine the number of pixels and gate lines in the pixel array 230 according to the design requirement of the display panel 220, wherein N is a positive integer.
The display panel 220 further has a plurality of touch electrodes 260 formed thereon, each touch electrode 260 corresponds to a plurality of pixel units and is disposed above the pixel units in an overlapping manner, in this embodiment, the touch electrodes 260 are taken as m rows, and each row includes n touch electrodes, and m × n touch electrodes are taken as an example. Each touch electrode 260 is coupled to one of the traces TL1 through TLN through contact points CT11 through CTmn, where m and n are positive integers. The traces TLl-TLN are arranged in the same direction as the gate lines G1-GN.
In the present embodiment, the touch display device 200 further includes a touch control circuit 270. Specifically, the touch control circuit 270 is disposed between the pixel array 230 (the touch electrode 260) and the gate driving circuit GOA. In addition, the touch control circuit 270 is coupled to the gate driving circuit GOA and the touch electrode 260 (or the pixel array 230), respectively. Therefore, the gate driving circuit GOA and the touch control circuit 270 are used for driving the pixel units (not shown) and the touch electrodes 260.
Fig. 3 is a schematic structural diagram of a gate driving circuit according to an embodiment of the invention. As shown in fig. 2 and fig. 3, the gate driving circuit GOA includes a first group of driving circuits 240 and a second group of driving circuits 250. One skilled in the art can determine the number of sets of driving circuits in the gate driving circuit GOA according to the design requirement of the display panel 220, and the present invention is only exemplified by two sets, but not limited to the above-mentioned number. The first group of driving circuits 240 and the second group of driving circuits 250 each include multiple stages of shift registers SR 1-1-SR 1-8 and SR 2-1-SR 2-8, and the stages of the shift registers SR in the two groups of driving circuits may be the same or different. The multi-stage shift registers SR 1-1-SR 1-8 and SR 2-1-SR 2-8 are respectively connected in series, and the output ends of each stage of shift registers SR 1-1-SR 1-8 and SR 2-1-SR 2-8 are respectively coupled to the corresponding gate lines G1-G1-8 and G2-1-G2-8. A flyback circuit 280 is also coupled between the first set of driver circuits 240 and the second set of driver circuits 250.
In this embodiment, the flyback circuit 280 includes a dummy shift register DSR, a first switch unit 281, a second switch unit 282, and a third switch unit 283. The first switch unit 281, the second switch unit 282 and the third switch unit 283 respectively include a first terminal, a second terminal and a control terminal. For example, the first switch unit 281, the second switch unit 282, and the third switch unit 283 may be thin film transistors. The first terminal is a source/drain of the thin film transistor, the second terminal is a drain/source of the thin film transistor, and the control terminal is a gate of the thin film transistor. However, the present invention is not limited thereto, and other switching elements may be used according to the manufacturing process or driving requirements.
Referring to FIG. 3, the dummy shift register DSR is coupled to the last stage shift register SR1-8 of the first group of driving circuits 240 and the source/drain of the second switch unit 282; the drain/source of the second switch unit 282 is coupled to the first stage shift register SR2-1 of the second set of driving circuits 250; the source/drain of the first switch unit 281 is coupled to the first stage shift register SR1-1 of the first group of driving circuits 240, and the drain/source of the first switch unit 281 is coupled to the second stage shift register SR1-2 of the first group of driving circuits 240; the source/drain of the third switching unit 283 is coupled to the source/drain of the first switching unit 281, and the drain/source of the third switching unit 283 is coupled to the dummy shift register DSR. A gate of the first switch unit 281 is electrically connected to a control signal DSW; the gate of the second switch unit 282 is also electrically connected to the control signal DSW; the gate of the third switching unit 283 is electrically connected to a control signal TSW.
Referring to the touch display device 200 of fig. 2 again, the gate driving circuit GOA is coupled to the control unit 210, and the control unit 210 provides the gate driving circuit control signal and the control signals DSW and TSW. In this embodiment, the control signal DSW is a display switch control signal, and the control signal TSW is a touch switch control signal. When the control signal DSW is at a high level, the display panel 230 is in a display state, and when the control signal TSW is at a high level, the display panel 230 is in a touch state. Specifically, when the touch display device 200 is in the display state, the control signal DSW is an enable signal, and the control signal TSW is a disable signal; on the contrary, when the touch display device 200 is in the touch state, the control signal DSW is the disable signal, and the control signal TSW is the enable signal. Taking the flyback circuit 280 of fig. 3 formed by N-type switch elements as an example, when the touch display device 200 is in the display state, the control signal DSW is at a high level, and the control signal TSW is at a low level; when the touch display device 200 is in the touch state, the control signal DSW is at the low potential, and the control signal TSW is at the high potential. In this way, taking the P-type switch device as an example, the enable signal is at a low potential, and the disable signal is at a high potential.
Fig. 4 is a schematic diagram of a touch control circuit structure according to an embodiment of the invention. Referring to FIGS. 2, 3 and 4, the touch control circuit 270 includes a plurality of sets of control circuits CS [1-1] -CS [1-8] and CS [2-1] -CS [2-8], each set of control circuits CS [1-1] -CS [1-8] and CS [2-1] -CS [2-8] corresponding to the shift registers SR 1-1-SR 1-8, SR 2-1-SR 2-8 and traces TL 1-TLN coupled thereto.
Each set of control circuits has the same circuit structure, and in this embodiment, the first set of control circuits CS [1-1] is taken as an example. The control circuit CS [1-1] includes a fourth switching unit 284, a fifth switching unit 285, a sixth switching unit 286, a seventh switching unit 287, and an eighth switching unit 288. The fourth switching unit 284, the fifth switching unit 285, the sixth switching unit 286, the seventh switching unit 287, and the eighth switching unit 288 include a first terminal, a second terminal, and a control terminal, respectively. For example, the fourth switching unit 284, the fifth switching unit 285, the sixth switching unit 286, the seventh switching unit 287, and the eighth switching unit 288 may be thin film transistors. The first terminal is a source/drain of the thin film transistor, the second terminal is a drain/source of the thin film transistor, and the control terminal is a gate of the thin film transistor. However, the present invention is not limited thereto, and other switching elements may be used according to the manufacturing process or driving requirements.
In the present embodiment, the source/drain of the fourth switching unit 284 is electrically connected to a control signal TPCOM, the drain/source thereof is coupled to the source/drain of the fifth switching unit 285, and the drain/source of the fifth switching unit 285 is coupled to the corresponding trace TL 1. The source/drain of the sixth switch unit 286 is electrically connected to a control signal DCOM, and the drain/source thereof is coupled to the corresponding trace TL 1. The seventh switch unit 287 has a source/drain coupled to the corresponding shift register SR1-1, and a drain/source coupled to the corresponding gate line G [1-1 ]. The eighth switch unit 288 has a source/drain electrically connected to a control signal VGL, and a drain/source coupled to the corresponding gate line G [1-1 ]. In addition, the gate of the fourth switching unit 284 is coupled to the output terminal of the shift register SR 1-1; the gates of the fifth switching unit 285 and the eighth switching unit 288 are electrically connected to the control signal TSW; the gates of the sixth switching unit 286 and the seventh switching unit 287 are electrically connected to the control signal DSW. Specifically, when the touch display device 200 is in the display state, the control signal DSW is an enable signal, and the control signal TSW is a disable signal; on the contrary, when the touch display device 200 is in the touch state, the control signal DSW is the disable signal, and the control signal TSW is the enable signal. Taking the touch control circuit of fig. 4 formed by N-type switch elements as an example, when the touch display device 200 is in the display state, the control signal DSW is at a high level, and the control signal TSW is at a low level; when the touch display device 200 is in the touch state, the control signal DSW is at the low potential, and the control signal TSW is at the high potential. In this way, taking the P-type switch device as an example, the enable signal is at a low potential, and the disable signal is at a high potential.
Referring to the touch display device 200 of fig. 2 again, the touch control circuit 270 is coupled to the control unit 210, and the control unit 210 provides the control signals DSW, TSW, TPCOM, DCOM, and VGL. The control signal TPCOM is a common voltage signal in a touch state, the control signal DCOM is a common voltage signal in a display state, and VGL is a pixel unit turn-off signal. When the touch display device 200 is in a touch state, the control signal TPCOM provides a common voltage to the display panel 230 to drive the touch electrode 260; when the touch display device 200 is in the display state, the control signal DCOM provides another common voltage to the display panel 230 to drive the plurality of pixel units. When the touch panel is in a touch state, the control signal VGL provides a fixed potential, for example, a low level, to the pixel unit, and turns off the tft in the pixel unit. In other words, in the touch state, when the control signal VGL is at a low level, the low level can be ensured to be transmitted to the gate line G [1-1], so that the gate (control end) of the thin film transistor in the pixel unit can receive the low level and is not turned on.
As can be seen from the above description, the touch display device 200 of the embodiment connects the traces TL 1-TLN of all the touch electrodes 260 to the touch control circuit 270, and then the control unit 210 drives the touch electrodes 260 of the display panel 230 through the control signals DSW, TSW, TPCOM, DCOM, and VGL. Therefore, no matter how the number of the touch electrodes 260 in the display panel 230 is increased, the number of the control signals transmitted to the touch control circuit 270 by the control unit 210 is only 5, and only 5 signal lines are needed to drive the touch electrodes 260 in the display panel 230.
FIG. 5 is a timing diagram illustrating control signal switching according to an embodiment of the present invention. As shown in fig. 2 to 5, during the display period, the control signal DSW is at a high level, the control signal TPCOM and the control signal TSW are at a low level, the first switch unit 281, the second switch unit 282, the sixth switch unit 286 and the seventh switch unit 287 are in an on state, the fifth switch unit 285 and the eighth switch unit 288 are in an off state, the control signal DCOM is connected to the gate line G [1-1] through the sixth switch unit 286 and the seventh switch unit 287, and the output signal of the shift register SR1-1 is provided to the gate line G [1-1], so as to drive the pixel units in the display panel 230, thereby ensuring the normal display of the display panel 230.
When the display state is switched to the touch state, the control signal TSW changes to a high level, the control signal DSW changes to a low level, the first switch unit 281, the second switch unit 282, the sixth switch unit 286, and the seventh switch unit 287 are in a closed state, the third switch unit 283, the fifth switch unit 285, and the eighth switch unit 288 are in an open state, and the control signal DCOM is disconnected by the sixth switch unit 286 and the seventh switch unit 287 and cannot be connected to the gate line G [1-1 ]; at the same time, the output signal of the shift register SR1-1 supplied to the gate line G [1-1] is also turned off. Since the eighth switching unit 288 is in the on state, the control signal VGL is transmitted to the gate line G [1-1] through the eighth switching unit 288, thereby maintaining the gate line G [1-1] in the display panel 230 at the potential of the control signal VGL. When VGL is at a low level, the thin film transistors in the pixel units are turned off in the display panel 230. Meanwhile, after the third switch unit 283 is turned on, the output signal of the shift register SR1-8 is transmitted to the dummy shift register DSR, the output signal cannot be transmitted to the next shift register SR2-1 because the second switch unit 282 is turned off, and the output signal returns upward to the shift register SR1-2 because the third switch unit 283 is turned on, the output signal of the shift registers SR1-2 to SR1-8 turns on the fourth switch unit 284, and the common voltage of the touch state, i.e., the control signal TPCOM, is transmitted to the trace TL2 through the fourth switch unit 284 and the fifth switch unit 285 to drive the touch electrode 260 in the display panel 230. Thus, the retrace circuit 280 and the touch control circuit 270 can be used to repeatedly turn on the shift registers SR1-2 SR1-8, and scan the gate lines G [1-2] G [1-8] and the traces TL2 TL8, respectively, so that the touch control circuit 270 and the gate driver GOA can share the gate lines.
When the display panel 230 is in operation, the output signal of each shift register in the gate driver circuit GOA will be used as the start signal of the next shift register, so that a switch unit can be set at the start signal of a certain stage of shift register according to design requirements, and the switch unit is controlled by the control signals DSW and TSW, so that after a section of image is displayed on the display panel 230, the driving signal is returned to the shift register of the set switch unit to be used as the input of the shift register, and further, the output signal of the shift register is reused.
In the embodiment, the first switch unit 281 is disposed between the first stage shift register SR1-1 and the second stage shift register SR1-2 of the first group of driving circuits 240, and may be disposed in other stages of shift registers according to the number of touch electrodes 260.
Fig. 6 is a schematic structural diagram of a touch display device according to another embodiment of the invention. Referring to fig. 2 to 4 and 6, in the touch display device 200' of the present embodiment, the touch electrodes 260 in the display panel 230 are divided into n rows, where n is a positive integer. When each row of touch electrodes corresponds to the four-level shift register and the four-level touch control circuit, for example, the first row of touch electrodes TP _ PAD1 corresponds to the shift registers SR 1-1-SR 1-4 and the touch control circuits CS [1-1] -CS [1-4 ]; the second row of touch control electrodes TP _ PAD2 correspond to the shift registers SR 2-1-SR 2-4 and the touch control circuits CS [2-1] CS [2-4 ]; the nth row of touch electrodes TP _ PADn corresponds to the shift registers SRn-1 to SRn-4 and the touch control circuits CS [ n-1] to CS [ n-4] (not shown in the figure). If there are only two touch electrodes in each row in the horizontal direction, a retrace circuit 280' may be provided for every four levels of shift registers. For example, the retrace circuit 280' is disposed between the fourth stage shift register SR1-4 of the first row and the first stage shift register SR2-1 of the second row, and the retrace start point is disposed at the third stage shift register SR1-3 of the first row. At this time, the touch control circuits CS [1-3] and CS [1-4] of the touch control circuit 270 are used to scan the first row of touch electrodes TP _ PAD1 through traces TL [1-3], TL [1-4], and the traces TL [1-1], TL [1-2] are floating or connected to other touch electrodes (not shown); touch control circuits CS [2-3] and CS [2-4] are used to scan the second row of touch electrodes TP _ PAD2 through traces TL [2-3], TL [2-4], with traces TL [2-1], TL [2-2] floating or connected to other touch electrodes (not shown), and so on. Therefore, although each row of touch electrodes corresponds to the four-level shift register and the four-level touch control circuit, only the two-level shift register and the two-level touch control circuit are needed to scan the two touch electrodes in the row. At this time, the scanning frequency of the display state is the same as the scanning frequency of the touch state. It should be noted that each stage of the shift register is also coupled to the corresponding gate lines G [1-1] G [ n-4] in the display panel 230, which are not shown for convenience of illustration.
Fig. 7 is a schematic structural diagram of a touch display device according to still another embodiment of the invention. Referring to fig. 2 to 4 and 7, in the touch display device 200 ″ of the present embodiment, the touch electrodes 260 in the display panel 230 are divided into n rows, where n is an even number. Similarly, each row of touch electrodes corresponds to four levels of shift registers, and if there are only two touch electrodes 260 in the horizontal direction, a retrace circuit 280 ″ can be provided every four levels of shift registers. For example, the flyback circuit 280 ″ is disposed between the fourth stage shift register SR1-4 of the first row and the first stage shift register SR2-1 of the second row. Unlike the embodiment shown in FIG. 6, the first stage shift register SR1-1, the first stage control circuit CS [1-1] and the second stage control circuit CS [1-2] of the touch control circuit 270, which are configured to set the retrace start point of the retrace circuit 280' on the first row, are used to scan the first row touch electrode TP _ PAD1 through traces TL [1-1], TL [1-2 ]; the first stage control circuit CS [2-1] and the second stage control circuit CS [2-2] of the second row are used to scan the second row of touch electrodes TP _ PAD2 through traces TL [2-1], TL [2-2 ]. If the n rows of touch electrodes 260 are divided into two groups, the third-level control circuit CS [1-3] and the fourth-level control circuit CS [1-4] of one row are used for scanning the (n/2) th row of touch electrodes TP _ PAD n/2 through the traces TL [1-3], TL [1-4], and the third-level control circuit CS [2-3] and the fourth-level control circuit CS [2-4] of the second row are used for scanning the (n/2 + 1) th row of touch electrodes TP _ PAD n/2+1 through the traces TL [2-3], TL [2-4 ]. In this way, each touch electrode has two traces to scan the touch electrode, and each touch electrode is scanned twice in one period, so that the scanning frequency of the touch state is twice as high as the scanning frequency of the display state.
Similarly, the n rows of touch electrodes 260 may be divided into X groups, each group includes Y-level control circuits, each touch electrode corresponds to Z-level control circuits at the same time, that is, is coupled to Z traces at the same time, the difference between the groups of two adjacent Z traces is X/Z, and the number of the Z traces corresponding to each touch electrode is the same. X, Y, Z is even greater than 2, and X, Y is evenly divisible by Z. The scanning frequency of the touch state can be Z times of the scanning frequency of the display state, and the sensitivity of the touch signal is further 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 (27)
1. A touch display device, comprising:
the touch display panel comprises a plurality of pixel units and a plurality of touch electrodes, wherein the pixel units are arranged in a plurality of rows along a first direction and a plurality of columns along a second direction, and the position of each touch electrode corresponds to the pixel units;
the gate lines are arranged on the touch display panel and are respectively coupled to the pixel units;
a plurality of traces disposed on the touch display panel and extending along the second direction, wherein the plurality of traces are coupled to the plurality of touch electrodes;
a gate driving circuit, including a first set of driving circuits and a second set of driving circuits, and the first set of driving circuits and the second set of driving circuits respectively include multi-stage shift registers, the gate driving circuit is coupled to the gate lines and the traces for driving the pixel units and the touch electrodes;
and a back-scanning circuit respectively coupled between the first group of driving circuits and the second group of driving circuits.
2. The touch display device of claim 1, wherein the flyback circuit comprises at least one dummy shift register and a plurality of switch units.
3. The touch display device of claim 2, wherein the plurality of switch units comprises a first switch unit, a second switch unit and a third switch unit, and the first switch unit, the second switch unit and the third switch unit respectively have a first end, a second end and a control end, wherein,
the dummy shift register is coupled to the shift register of the last stage of the first group of driving circuits and the first end of the second switch unit, respectively.
4. The touch display device of claim 3, wherein the second terminal of the second switch unit is coupled to the shift register of the first stage of the second set of driving circuits.
5. The touch display device of claim 4, wherein the first terminal of the first switch unit is coupled to a first stage of the shift register of the first set of driving circuits, and the second terminal of the first switch unit is coupled to a second stage of the shift register of the first set of driving circuits.
6. The touch display device as recited in claim 5, wherein the first terminal of the third switching unit is coupled to the first terminal of the first switching unit, and the second terminal of the third switching unit is coupled to the dummy shift register.
7. The touch display device of claim 3,
the control end of the first switch unit is electrically connected with a first control signal;
the control end of the second switch unit is electrically connected with the first control signal;
the control end of the third switching unit is electrically connected with a second control signal.
8. The touch display device of claim 1, further comprising a touch control circuit coupled between the gate driving circuit and the touch electrodes and between the pixel units, wherein the touch control circuit comprises a plurality of sets of control circuits, and each set of control circuits corresponds to each stage of the shift register.
9. The touch display device of claim 8, wherein each set of the control circuits comprises a fourth switch unit, a fifth switch unit, a sixth switch unit, a seventh switch unit, and an eighth switch unit, and the fourth switch unit, the fifth switch unit, the sixth switch unit, the seventh switch unit, and the eighth switch unit respectively have a first end, a second end, and a control end, wherein,
the first end of the fourth switching unit is electrically connected to a third control signal, the second end of the fourth switching unit is coupled to the first end of the fifth switching unit, and the second end of the fifth switching unit is coupled to the trace.
10. The touch display device of claim 9,
the first end of the sixth switch unit is electrically connected to a fourth control signal, and the second end of the sixth switch unit is coupled to the traces.
11. The touch display device of claim 10,
the first end of the seventh switch unit is coupled to the multi-stage shift register, and the second end of the seventh switch unit is coupled to the plurality of gate lines.
12. The touch display device of claim 11,
the first end of the eighth switch unit is electrically connected to a fifth control signal, and the second end of the eighth switch unit is coupled to the plurality of gate lines.
13. The touch display device of claim 12,
the control end of the fourth switch unit is coupled to the multi-stage shift register;
the control ends of the fifth switch unit and the eighth switch unit are electrically connected with the second control signal;
the control ends of the sixth switching unit and the seventh switching unit are electrically connected to the first control signal.
14. The touch display device of claim 1, wherein the plurality of traces comprises X sets of traces, each set of traces comprising Y-level traces, each of the touch electrodes being coupled to Z traces simultaneously, wherein adjacent two of the Z traces have a difference in number of X/Z, the Z traces have the same number of levels, X, Y, Z is an even number greater than 2, and X, Y is divisible by Z.
15. A touch display device, comprising:
the touch display panel comprises a plurality of pixel units and a plurality of touch electrodes, wherein the pixel units are arranged in a plurality of rows along a first direction and a plurality of columns along a second direction, and the position of each touch electrode corresponds to the pixel units;
a plurality of gate lines disposed on the touch display panel and coupled to the pixel units respectively;
a plurality of traces disposed on the touch display panel and arranged to extend along the second direction, wherein the plurality of traces are coupled to the plurality of touch electrodes;
a gate driving circuit, including a first set of driving circuits and a second set of driving circuits, and the first set of driving circuits and the second set of driving circuits respectively include multi-stage shift registers, the gate driving circuit is coupled to the gate lines and the traces for driving the pixel units and the touch electrodes;
a flyback circuit, coupled between the first group of driving circuits and the second group of driving circuits, respectively, and electrically connected to a first control signal and a second control signal; it is characterized in that;
in a display period, the first control signal is an enable (enable) potential, and the second control signal is a disable (disable) potential;
during a touch control period, the second control signal is an enable potential, and the first control signal is a disable potential.
16. The touch display device of claim 15, wherein the flyback circuit comprises at least one dummy shift register and a plurality of switch units.
17. The touch display device of claim 16, wherein the plurality of switch units comprises a first switch unit, a second switch unit, and a third switch unit, and the first switch unit, the second switch unit, and the third switch unit each have a first end, a second end, and a control end, wherein,
the dummy shift register is coupled to the shift register of the last stage of the first group of driving circuits and the first end of the second switch unit, respectively.
18. The touch display device of claim 17, wherein the second terminal of the second switch unit is coupled to the shift register of the first stage of the second set of driving circuits.
19. The touch display device of claim 18, wherein the first terminal of the first switch unit is coupled to a first stage of the shift register of the first set of driving circuits, and the second terminal of the first switch unit is coupled to a second stage of the shift register of the first set of driving circuits.
20. The touch display device as recited in claim 19, wherein the first terminal of the third switching unit is coupled to the first terminal of the first switching unit, and the second terminal of the third switching unit is coupled to the dummy shift register.
21. The touch display device of claim 17,
the control end of the first switch unit is electrically connected with the first control signal;
the control end of the second switch unit is electrically connected with the first control signal;
the control terminal of the third switching unit is electrically connected to the second control signal.
22. The touch display device as claimed in claim 15, further comprising a touch control circuit coupled between the gate driving circuit and the touch electrodes and between the pixel units, wherein the touch control circuit comprises a plurality of sets of control circuits, each set of control circuits corresponds to each stage of the shift register, and the touch control circuit is electrically connected to the first control signal and the second control signal.
23. The touch display device of claim 22, wherein each set of the control circuits comprises a fourth switch unit, a fifth switch unit, a sixth switch unit, a seventh switch unit, and an eighth switch unit, and the fourth switch unit, the fifth switch unit, the sixth switch unit, the seventh switch unit, and the eighth switch unit respectively have a first end, a second end, and a control end, wherein,
the first terminal of the fourth switching unit is electrically connected to a third control signal, the second terminal of the fourth switching unit is coupled to the first terminal of the fifth switching unit, and the second terminal of the fifth switching unit is coupled to the trace;
during the touch control period, the third control signal is a touch control common voltage potential.
24. The touch display device of claim 23,
the first end of the sixth switch unit is electrically connected with a fourth control signal, and the second end of the sixth switch unit is coupled with the plurality of traces;
during the display period, the fourth control signal is a display common voltage potential.
25. The touch display device of claim 24,
the first end of the seventh switch unit is coupled to the multi-stage shift register, and the second end of the seventh switch unit is coupled to the plurality of gate lines.
26. The touch display device of claim 25,
the first end of the eighth switch unit is electrically connected to a fifth control signal, and the second end of the eighth switch unit is coupled to the plurality of gate lines;
during the touch control period, the fifth control signal is a low voltage potential.
27. The touch display device of claim 26,
the control end of the fourth switch unit is coupled to the multi-stage shift register;
the control ends of the fifth switch unit and the eighth switch unit are electrically connected with the second control signal;
the control ends of the sixth switching unit and the seventh switching unit are electrically connected to the first control signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811617296.6A CN111381701B (en) | 2018-12-27 | 2018-12-27 | Touch control display device |
| TW108111757A TWI710935B (en) | 2018-12-27 | 2019-04-02 | Touch display device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811617296.6A CN111381701B (en) | 2018-12-27 | 2018-12-27 | Touch control display device |
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| CN111381701B true CN111381701B (en) | 2022-09-30 |
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| TW202024879A (en) | 2020-07-01 |
| CN111381701A (en) | 2020-07-07 |
| TWI710935B (en) | 2020-11-21 |
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