TWI709884B - Touch display apparatus and controlling method thereof - Google Patents

Abstract

A touch display apparatus and a controlling method thereof are provided. The touch display apparatus includes a touch display panel, a plurality of pixels, a plurality of common electrodes, a plurality of common voltage transmission switches and a plurality of data transmission switch sets. The pixels are divided into a plurality of display areas. The common electrodes respectively correspond to the display areas. The common voltage transmission switches respectively decide whether to transport common voltages to the common electrodes according to a plurality of control signals. The data transmission switch sets respectively correspond to the common voltage transmission switches, are respectively controlled by a plurality of multiplexer signals, and turn-on or cut-off statuses of each of the data transmission switch sets and corresponding common voltage transmission switch are the same.

Description

Touch display device and control method thereof

The present invention relates to a touch display device and a control method thereof, and more particularly to a touch display device and a control method thereof that can reduce noise.

In a conventional technology, the stylus can use Active Electrostatic Solution (AES) to improve the accuracy of the screen edge and reduce parallax. However, the stylus in the above-mentioned conventional technology must have a power source before it can be used. In another conventional technology, in order not to provide a power switch on the stylus and to save power consumption, a signal transmitter is provided on the touch display device, and a wake-up signal is output at regular intervals. When the stylus is close to the touch display device, the stylus can start to work according to the received wake-up signal. In addition, when the stylus leaves the sensing range of the touch display device, the signal transmitter line transmits the wake-up signal again.

In the above-mentioned conventional technology, multiple signal transmitters need to be set up on the touch-sensitive display device and send wake-up signals in the same time interval. Therefore, a certain degree of noise is generated and affects the touch-sensitive display device. Display quality.

The invention provides a touch display device and a control method thereof, which can reduce the noise energy generated and improve the display quality.

The touch display device of the present invention includes a touch display panel. The touch display panel includes a plurality of display pixels, a plurality of common electrodes, a plurality of common voltage transmission switches, and a plurality of data transmission switch groups. The display pixels are arranged on the touch display panel and divided into multiple display partitions. The common electrodes are arranged on the touch display panel, and the common electrodes respectively correspond to display zones. The common voltage transmission switches are respectively coupled to the common electrodes, and the common voltage transmission switches respectively determine whether to transmit a plurality of common voltages to the common electrodes respectively according to a plurality of control signals. The data transmission switch groups respectively correspond to the common voltage transmission switches, wherein the data transmission switch groups are respectively controlled by multiple multiplexing signals, and each data transmission switch group has the same on or off state as the corresponding common voltage transmission switches.

The control method of the present invention is suitable for touch display devices. The touch display device includes a touch display panel. The touch display panel includes a plurality of display pixels, a plurality of common electrodes, a plurality of common voltage transmission switches, and a plurality of data transmission switch groups. The control method includes: distinguishing the touch display panel of the touch display device into a plurality of display partitions, wherein each display partition includes a plurality of display pixels, and a common electrode is respectively arranged on the display partition; and a plurality of common voltage transmission switches are respectively coupled Connect to the common electrode, and respectively provide a plurality of control signals to the common voltage transmission switch, wherein the control signal is used to control the common voltage transmission switch to respectively transmit a plurality of common voltages to the common electrode; and to make the plurality of data transmission switch groups separately Corresponding to common voltage transmission switch, provide Multiple multiplexing signals are used to control the data transmission switch group respectively. Each data transmission switch group has the same on or off state as the corresponding common voltage transmission switch.

Based on the above, in the present invention, a plurality of common electrodes are respectively arranged corresponding to a plurality of display partitions of a touch display panel, and the common voltage transmission switch is used to make each common electrode receive a common voltage. The display pixel corresponding to each common electrode is The charging action is synchronized. In this way, when the display pixel is not performing the charging action, the voltage on both ends of the pixel capacitor of the display pixel can have a similar voltage recovery capability, which can reduce the interference of display quality caused by noise .

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments are described in detail in conjunction with the accompanying drawings.

100, 200, 300, 600, 700: touch display device

110, 210, 810, 820, 830: touch display panel

PXA~PXD, PXA11~PXA32, PXB11~PXB32: display pixels

121~124, 221~22N, 321, 322, 621~62N, 721~72N: common electrode

230: Shared voltage generator

240: circuit board

261~263: circuit board

SWM1~SWMN, SWMA, SWMB: common voltage transmission switch

SWD1~SWD8: data transmission switch

G1~G4: gate line

D1~D8: data transmission line

VCOM1~VCOM6: common voltage

CTR1~CTRN, CTRA, CTRB: control signal

MUX1~MUX8, MUXA, MUXB: multiplex signal

S1~S4: Data signal

DIR1, DIR2: direction

TPA1, TPA2, WK1~WK4: time interval

VD1: Data voltage

V321: Common electrode voltage

VLC: Voltage difference

811, 821, 831: touch substrate

816, 826, 835: first substrate

812, 822, 832: second substrate

813, 823, 833: display medium layer

814, 815, 824, 825, 834: insulating layer

DL: Data transmission line

PE: Pixel electrode for displaying pixels

CE: Common electrode

SF1, SF2: surface

S910~S930: Control steps

FIG. 1 is a schematic diagram of a touch display device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing a partial structure of a touch display device according to another embodiment of the invention.

FIG. 3 is a schematic diagram of a partial circuit of a touch display device according to an embodiment of the invention.

FIG. 4 is an operation waveform diagram of the touch display device according to an embodiment of the present invention.

FIG. 5 is a schematic diagram of voltages across display pixels of the touch display device of the embodiment of the present invention.

FIG. 6 shows a configuration of the common electrode of the touch display device according to the embodiment of the present invention Schematic diagram.

FIG. 7 is a schematic diagram of another configuration of the common electrode of the touch display device according to the embodiment of the present invention.

8A to 8C are structural diagrams of different implementations of the touch display panel of the touch display device of the embodiment of the present invention.

FIG. 9 is a flowchart of a control method of a touch display device according to an embodiment of the invention.

Please refer to FIG. 1. FIG. 1 is a schematic diagram of a touch display device according to an embodiment of the present invention. The touch display device 100 includes a touch display panel 110. The touch display panel 110 includes display pixels PXA to PXD, common electrodes 121 to 124, common voltage transmission switches SWM1 to SWM4, and data transmission switches SWD1 to SWD8. The display pixels PXA to PXD are arranged on the touch display panel 110 and are divided into multiple display partitions. In this embodiment, the display pixels PXA~PXD are divided into four display zones, which correspond to the common electrodes 121~124, respectively. In this embodiment, the range of the common electrodes 121~124 corresponds to the range of the four display zones. . A plurality of gate lines G1 to G4 and a plurality of data transmission lines D1 to D8 are also arranged on the touch display panel 110. Each display pixel PXA~PXD is coupled to one of the gate lines G1~G4 and one of the data transmission lines D1~D8. The common voltage transmission switches SWM1 to SWM4 are respectively coupled to the common electrodes 121 to 124, and the common voltage transmission switches SWM1 to SWM4 jointly receive the common voltage VCOM1. In addition, the common voltage transmission switch SWM1 ~ SWM4 control The terminals receive control signals CTR1~CTR4 respectively, wherein the control signals CTR1~CTR4 are used to control the on or off states of the common voltage transmission switches SWM1~SWM4, respectively. Furthermore, taking the common voltage transmission switch SWM1 as an example, when the common voltage transmission switch SWM1 is turned on according to the control signal CTR1, the common voltage transmission switch SWM1 can transmit the common voltage VCOM1 to the common electrode 121. In contrast, when the common voltage transmission switch SWM1 is turned off according to the control signal CTR1, the common voltage VCOM1 is not transmitted to the common electrode 121, and the common electrode 121 is in a floating state.

On the other hand, in this embodiment, the data transmission switches SWD1 to SWD8 can be divided into multiple data transmission switch groups. Among them, the data transmission switches SWD1 and SWD2 are the first data transmission switch group SWG1 and are coupled to the display pixel PXA corresponding to the common electrode 121; the data transmission switches SWD3 and SWD4 are the second data transmission switch group SWG2 and are coupled to The display pixel PXB corresponding to the common electrode 122; the data transmission switches SWD5 and SWD6 are the third data transmission switch group SWG3 and are coupled to the display pixel PXC corresponding to the common electrode 123; the data transmission switches SWD7 and SWD8 are the fourth data transmission The switch group SWG4 is coupled to the display pixel PXD corresponding to the common electrode 124. In addition, in this embodiment, the first data transmission switch group to the fourth data transmission switch group correspond to the common voltage transmission switches SWM1 to SWM4, respectively. The on or off actions of the first data transmission switch group to the fourth data transmission switch group are the same as the on or off actions of the corresponding common voltage transmission switches SWM1 to SWM4, respectively.

In detail, the data transmission switches SWD1~SWD8 are controlled by the multiplex signals MUX1~MUX8 respectively, and are guided by the multiplex signals MUX1~MUX8 respectively. On or off. In this embodiment, the data transmission switches SWD1 and SWD3 receive the same data signal S1; the data transmission switches SWD2 and SWD4 receive the same data signal S2; the data transmission switches SWD5 and SWD7 receive the same data signal S3; the data transmission switches SWD6, SWD8 receives the same data signal S4.

In terms of operation details, the data transmission switches SWD1 and SWD2 can be simultaneously turned on in the same first time interval according to the multiplexing signals MUX1 and MUX2, respectively, and the common voltage transmission switch SWM1 is also turned on at the same time in the first time interval. In contrast, the data transmission switches SWD1 and SWD2 can be turned off simultaneously in the same second time interval according to the multiplexing signals MUX1 and MUX2 respectively, and the common voltage transmission switch SWM1 is also turned off at the same time in the second time interval.

Following the above description, the data transmission switches SWD3 and SWD4 can be simultaneously turned on in the same second time interval according to the multiplexing signals MUX3 and MUX4 respectively, and the common voltage transmission switch SWM2 is also turned on at the same time in the second time interval. In contrast, the data transmission switches SWD3 and SWD4 can be simultaneously turned off in the same first time interval according to the multiplexing signals MUX3 and MUX4, respectively, and the common voltage transmission switch SWM2 is also turned off at the same time in the first time interval.

That is, in this embodiment, the multiplex signals MUX1 and MUX2 received by the data transmission switches SWD1 and SWD2 and the control signal CTR1 received by the common voltage transmission switch SWM1 may be the same signal. The multiplex signals MUX3 and MUX4 received by the data transmission switches SWD3 and SWD4 and the control signal CTR2 received by the common voltage transmission switch SWM2 may also be the same signal.

In addition, the actions of the data transmission switches SWD5, SWD6 and the common voltage transmission switch SWM3 can be synchronized with the data transmission switches SWD1, SWD2 and the common voltage transmission switch SWM1, and the data transmission switches SWD7, SWD8 and the common voltage transmission switch SWM4 can be synchronized with the data transmission. The switches SWD7, SWD8 and the common voltage transmission switch SWM4 are synchronized, which will not be repeated here.

It can be seen from the above description that taking the display pixel PXA as an example, when the data transmission switches SWD1 and SWD2 are turned on and the display pixel PXA receives the data signal S1 for charging, the common voltage transmission switch SWM1 synchronously provides a common voltage VCOM1 to the common electrode 121, so that the charging action of the display pixel PXA can be successfully completed. When the data transmission switches SWD1 and SWD2 are turned off, the common voltage transmission switch SWM1 stops supplying the common voltage VCOM1 to the common electrode 121, and makes the common electrode 121 a floating state. In this way, when the display pixel PXA is interfered by noise, the voltage recovery capability of the two ends of the pixel capacitance of the display pixel PXA after the interference is the same. Therefore, the change in the display brightness provided by the display pixel PXA can be reduced and the display quality can be improved.

Incidentally, the common voltage transmission switches SWM1 to SWM4 in the embodiment of the present invention receive the same common voltage VCOM1. In other embodiments of the present invention, the common voltage transmission switches SWM1 to SWM4 can also receive a plurality of different common voltages without a fixed limit. In addition, the number of common voltage transmission switches SWM1 to SWM4 and data transmission switches SWD1 to SWD8 shown in FIG. 1 are only examples for illustration. In the touch display device of the embodiment of the present invention, any number can be set according to requirements. The number of common voltage transmission switches and data transmission switches, nothing special limit.

Please also note that in this embodiment, the arrangement direction of the common electrodes 121 to 124 extends along the first direction DIR1 for arrangement, and the data transmission lines D1 to D8 extend along the second direction DIR2 for arrangement. Make settings. In other words, the extending directions of the common electrodes 121 to 124 and the data transmission lines D1 to D8 (the first direction DIR1 and the second direction DIR2) are the same (or parallel to each other).

In addition, the common voltage transmission switches SWM1 to SWM4 and the data transmission switches SWD1 to SWD8 in this embodiment are all transistor switches. Based on the common voltage transmission switches SWM1~SWM4 used to provide the DC common voltage VCOM1 to the common electrodes 121~124, or to make the common electrodes 121~124 float, the common voltage transmission switches SWM1~SWM4 do not need to use excessively large transistors. Set up. In other words, the size of the common voltage transmission switches SWM1 to SWM4 can be smaller than the size of the data transmission switches SWD1 to SWD8.

Please refer to FIG. 2. FIG. 2 is a schematic diagram of a partial structure of a touch display device according to another embodiment of the present invention. The touch display device 200 includes a touch display panel 210, a plurality of common electrodes 221 to 22N, a plurality of common voltage transmission switches SWM1 to SWMN, and a common voltage generator 230. The common electrodes 221-22N are arranged on the touch display panel 210, and are arranged to extend according to the first direction DIR1. The first ends of the common voltage transmission switches SWM1 ˜SWMN are respectively coupled to the common electrodes 221-22N, and the second ends of the common voltage transmission switches SWM1 ˜SWMN are coupled to the common voltage generator 230 to receive the common voltage VCOM1. The common voltage generator 230 can be configured on the circuit board 240, where the circuit board 240 and the touch display panel 210 can pass through one or more The circuit boards 261 to 263 are coupled to each other, and the circuit boards 261 to 263 may be rigid circuit boards or flexible circuit boards.

It is worth noting that the common electrodes 221-22N are not connected to each other, and adjacent common electrodes 221-22N have separate spaces arranged vertically (extending along the first direction DIR1). The common voltage transmission switches SWM1 to SWMN are constructed by a plurality of transistors (such as thin film transistors), and adjacent common voltage transmission switches (such as the common voltage transmission switches SWM1 and SWM2) can receive different control signals.

Please refer to FIG. 3. FIG. 3 is a schematic diagram of a partial circuit of a touch display device according to an embodiment of the present invention. In FIG. 3, the display pixels PXA11 to PXA31 are coupled to the data transmission line D1, the display pixels PXA12 to PXA32 are coupled to the data transmission line D2, and the data transmission switches SWD1 and SWD2 are respectively coupled to the data transmission lines D1 and D2. The display pixels PXB11 to PXB31 are coupled to the data transmission line D3, the display pixels PXB12 to PXB32 are coupled to the data transmission line D4, and the data transmission switches SWD3 and SWD4 are respectively coupled to the data transmission lines D3 and D4. In addition, the display pixels PXA11~PXA31 and the display pixels PXB11~PXB31 are respectively controlled by the gate lines G1~G4 according to the arrangement position.

In this embodiment, the data transmission switches SWD1 and SWD2 further respectively receive the data signals S1 and S2, and they are jointly controlled by the multiplex signal MUXA. The data transmission switches SWD1 and SWD2 form a data transmission switch group SWG1, and are used to drive the display pixels PXA11~PXA32. The display pixels PXA11~PXA32 are coupled to the common electrode 321, and the common electrode 321 is also coupled to one of the common voltage transmission switch SWM1 end. The other end of the common voltage transmission switch SWM1 receives the common voltage VCOM1 and is controlled by the control signal CTRA. The data transmission switches SWD3 and SWD4 receive the data signals S1 and S2 respectively, and are jointly controlled by the multiplex signal MUXB. The data transmission switches SWD3 and SWD4 form another data transmission switch group SWG2, and are used to drive the display pixels PXB11~PXB32. The display pixels PXB11 to PXB32 are coupled to the common electrode 322, and the common electrode 322 is coupled to one end of the common voltage transmission switch SWM2. The other end of the common voltage transmission switch SWM2 receives the common voltage VCOM1 and is controlled by the control signal CTRB.

Please refer to FIG. 3 and FIG. 4 simultaneously. FIG. 4 is an action waveform diagram of the touch display device according to an embodiment of the present invention. In the time interval TPA1, the multiplexing signal MUXA is pulled up to a high voltage, and the multiplexing signal MUXB is maintained at a low voltage. Correspondingly, the control signal CTRA is pulled up to a high voltage, and the control signal CTRB is maintained at a low voltage. As a result, the data transmission switches SWD1 and SWD2 are turned on, and respectively transmit data signals S1 and S2 to charge one of the display pixels PXA11 to PXA31 and one of the display pixels PXA12 to PXA32. At the same time, the common voltage transmission switch SWM1 is turned on, and transmits the common voltage VCOM1 to the common electrode 321, so that the charging operation of the charged display pixels can be performed smoothly.

In the time interval TPA1, the data transmission switches SWD3, SWD4, and the common voltage transmission switch SWM2 are all turned off, and the data transmission lines D3, D4 and the common electrode 322 are all in a floating state.

In addition, in the time interval TPA2, the multiplexing signal MUXB is pulled up to a high voltage, and the multiplexing signal MUXA is pulled down to a low voltage. Correspondingly, the control signal The signal CTRB is pulled up to a high voltage, and the control signal CTRA is pulled down to a low voltage. In this way, the data transmission switches SWD3 and SWD4 are turned on, and respectively transmit data signals S1 and S2 to charge one of the display pixels PXB11 to PXB31 and one of the display pixels PXB12 to PXB32. At the same time, the common voltage transmission switch SWM2 is turned on, and transmits the common voltage VCOM1 to the common electrode 322, so that the charging operation of the charged display pixels can be performed smoothly.

In the time interval TPA2, the data transmission switches SWD1, SWD2 and the common voltage transmission switch SWM1 are all turned off, and the data transmission lines D1, D2 and the common electrode 321 are all in a floating state.

Please refer to FIG. 3, FIG. 4, and FIG. 5 simultaneously. FIG. 5 is a schematic diagram of the voltage across the display pixels of the touch display device of the present embodiment. Taking the display pixel PXA11 as an example, when the multiplexing signal MUXA and the control signal CTRA are pulled down to a low voltage at the same time, the data transmission switch SWD1 and the common voltage transmission switch SWM1 are all turned off, so that both ends of the display pixel PXA11 ( When the voltages on the data transmission line D1 and the common electrode 321 (respectively the data voltage VD1 and the common electrode voltage V321) are in the floating state, when the touch display device 300 enters the time for sending a wake-up signal (to wake up the stylus) In the interval WK1~WK4, the data voltage VD1 and the common electrode voltage V321 will have voltage fluctuations due to the influence of noise. Based on the condition that both ends of the display pixel PXA11 are floating, the data voltage VD1 and the common electrode voltage V321 have the same voltage recovery capability. Therefore, the voltage change of the voltage difference between the two ends of the liquid crystal capacitor of the display pixel PXA11 VLC Approaching 0. In other words, the display brightness of the display pixel PXA11 can be disturbed by the wake-up signal. Effectively be reduced.

Incidentally, after the display pixels PX11~PXA12 on the gate line G1 complete the charging action, the display pixels PX11~PXA12 can be turned off according to the gate drive signal on the gate line G1. Then, the display pixels PX21 to PXA22 on the gate line G2 are activated, and the common electrode 321 at this time can be charged again according to the common voltage VCOM1. It is worth noting that based on the state where the display pixels PX11~PXA12 are turned off at this time, regardless of the voltage value of the recharged common voltage VCOM1, the recharging action of the common electrode 321 at this time will not affect the display picture. Therefore, the display pixels PX11~PXA12 can maintain the correct display brightness.

Please refer to FIG. 6. FIG. 6 is a schematic diagram of a configuration of the common electrode of the touch display device according to an embodiment of the present invention. The touch display device 600 has a plurality of common electrodes 621 to 62N. The common electrodes 621 to 62N are respectively coupled to a plurality of common voltage transmission switches SWM1 to SWMN. In this embodiment, the common voltage transmission switches SWM1~SWMN are respectively controlled by a plurality of control signals CTR1~CTRN, wherein the control signals CTR1~CTRN may all be different. Alternatively, the control signals CTR1~CTRN can be divided into multiple groups, the control signals of the same group have the same waveform, and the control signals of different groups have different waveforms. Here, the number of control signals of the same group can be 2, 3, 4, 6, or any integer number, and there is no certain limit.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of another configuration of the common electrode of the touch display device according to the embodiment of the present invention. The touch display device 700 has multiple common Use electrodes 721~72N. The common electrodes 721 to 72N are respectively coupled to a plurality of common voltage transmission switches SWM1 to SWMN, and the common voltage transmission switches SWM1 to SWMN can receive the same or different common voltages VCOM1 to VCOM6. It is worth noting that, in order to improve the uniformity of the common voltage received in the touch display device 700, the common voltages VCOM1~VCOM6 received by the common voltage transmission switches SWM1~SWMN can be set symmetrically according to the positions of the common voltage transmission switches SWM1~SWMN. The common voltage transmission switches (such as the common voltage transmission switches SWM1 and SWMN) arranged at the edge can receive the same common voltage VCOM1, and the common voltage transmission switches (such as the common voltage transmission switches SWMA, SWMB) arranged in the center can receive another common voltage VCOM6.

Please refer to FIGS. 8A to 8C below. FIGS. 8A to 8C are structural diagrams of different implementations of the touch display panel of the touch display device of the embodiment of the present invention. In FIG. 8A, the touch display panel 810 includes a touch substrate 811, a first substrate 816, a second substrate 812, a display medium layer 813, insulating layers 814, 815, a data transmission line DL, a pixel electrode PE for displaying pixels, and Common electrode CE. In this embodiment, the data transmission line DL is disposed on the surface SF1 of the first substrate 816. The insulating layer 815 is disposed on the surface SF1 of the first substrate 816 and covers the data transmission line DL. The common electrode CE may be disposed on the insulating layer 815, and the insulating layer 814 is disposed on the insulating layer 815 and covers the common electrode CE.

In addition, the display medium layer 813 is disposed between the second substrate 812 and the insulating layer 814, and the pixel electrode PE of the display pixel is disposed on the upper surface of the insulating layer 814 in the display medium layer 813. In addition, the touch substrate 811 may be disposed on the second substrate 812 on.

Incidentally, in this embodiment, the first substrate 816 and the second substrate 812 may both be glass substrates.

In addition, in FIG. 8B, the touch display panel 820 includes a touch substrate 821, a first substrate 826, a second substrate 822, a display medium layer 823, insulating layers 824, 825, a data transmission line DL, and pixel electrodes for display pixels. PE and common electrode CE. In this embodiment, the data transmission line DL is disposed on the surface SF1 of the first substrate 826. The insulating layer 825 is disposed on the surface SF1 of the first substrate 826 and covers the data transmission line DL. The pixel electrode PE of the display pixel may be disposed on the insulating layer 815, and the insulating layer 814 is disposed on the insulating layer 815 and covers the pixel electrode PE.

In addition, the display medium layer 823 is disposed between the lower surface SF2 of the second substrate 822 and the insulating layer 824, and the common electrode CE is disposed on the upper surface of the insulating layer 824 in the display medium layer 823. In addition, the touch substrate 821 may be disposed on the second substrate 822.

In FIG. 8C, the touch display panel 830 includes a touch substrate 831, a first substrate 835, a second substrate 832, a display medium layer 833, an insulating layer 834, a data transmission line DL, a pixel electrode PE of display pixels, and a common electrode. CE. In this embodiment, the data transmission line DL is disposed on the surface SF1 of the first substrate 835. The insulating layer 834 is disposed on the surface SF1 of the first substrate 835 and covers the data transmission line DL. The display medium layer 833 is disposed between the insulating layer 834 and the surface SF2 of the second substrate 832. The pixel electrode PE of the display pixel may be disposed on the insulating layer 834, and the common electrode CE may be disposed on the surface SF2 of the second substrate 832.

Please refer to FIG. 9. FIG. 9 is a flowchart of a control method of a touch display device according to an embodiment of the present invention. In this embodiment, the touch display device includes the touch display panel 110 as shown in the embodiment of FIG. 1. In the control method of this embodiment, step S910 distinguishes the touch display panel of the touch display device into multiple display partitions, where each display partition includes multiple display pixels, and common electrodes are respectively provided on the display partitions; step S920 enables The plurality of common voltage transmission switches are respectively coupled to the common electrodes and respectively provide a plurality of control signals to the common voltage transmission switches, wherein the control signals are used to respectively control whether the common voltage transmission switches respectively transmit a plurality of common voltages to the common electrodes; and In step S930, the multiple data transmission switch groups correspond to the common voltage transmission switches respectively, and multiple multiplexing signals are provided to control the data transmission switch groups respectively. Wherein, each data transmission switch group and the corresponding common voltage transmission switch have the same on or off state.

The implementation details of the foregoing steps have been described in detail in the foregoing embodiments and implementations, and will not be repeated here.

In summary, the present invention distinguishes display pixels into multiple display partitions, and sets multiple common electrodes corresponding to the display partitions respectively. The present invention also controls the receiving state of the common voltage on the common electrode through a plurality of common voltage transmission switches. Among them, when the display pixel is not charging (and the connection with the data transmission line is disconnected), the corresponding common electrode is disconnected in synchronization with the common voltage. As a result, the two ends of the pixel capacitance of the display pixel are disconnected. The voltage recovery capability of the battery can be similar, and when noise interference occurs, it can effectively reduce the change in display brightness and improve the display quality.

Although the present invention has been disclosed as above by embodiments, it is not intended to limit the Inventions, any person with ordinary knowledge in the technical field can make some changes and modifications without departing from the spirit and scope of the invention. Therefore, the scope of protection of the invention shall be defined by the scope of the appended patent application. quasi.

100: Touch display device

110: Touch display panel

PXA~PXD: display pixels

121~124: Common electrode

SWM1~SWM4: Shared voltage transmission switch

SWD1~SWD8: data transmission switch

G1~G4: gate line

D1~D8: data transmission line

VCOM1: Common voltage

CTR1~CTR4: control signal

MUX1~MUX8: multiplex signal

S1~S4: Data signal

DIR1: first direction

DIR2: second direction

Claims (11)

A touch display device includes: a touch display panel, including: a plurality of display pixels arranged on the touch display panel and divided into a plurality of display partitions; a plurality of common electrodes arranged on the touch display On the panel, the common electrodes correspond to the display partitions; a plurality of common voltage transmission switches are respectively coupled to the common electrodes, and the common voltage transmission switches respectively determine whether to transmit multiple common electrodes according to a plurality of control signals. Voltage to the common electrodes, wherein the common voltage transmission switches include: at least one first common voltage transmission switch and at least one second common voltage transmission switch, the at least one first common voltage transmission switch receives a first common voltage, And controlled by a first control signal to transmit the first common voltage to at least one first common electrode, the at least one second common voltage transmission switch receives a second common voltage, and is controlled by a second control signal to Transmitting the second common voltage to at least one second common electrode; and a plurality of data transmission switch groups corresponding to the common voltage transmission switches, wherein the data transmission switch groups are controlled by a plurality of multiplexing signals, each The data transmission switch group has the same on or off state as the corresponding common voltage transmission switches. According to the touch-sensitive display device described in claim 1, wherein the on and off states of the at least one first common voltage transmission switch and the at least one second common voltage transmission switch are different. The touch display device according to claim 1, wherein the data transmission switch groups include: at least one first data transmission switch group coupled to a plurality of first pictures corresponding to at least one first common electrode Pixels, controlled by a first multiplexing signal; and at least one second data transmission switch group, coupled to a plurality of second pixels corresponding to at least one second common electrode, controlled by a second multiplexing signal . According to the touch display device described in claim 3, the first multiplex signal is the same as the first control signal, and the second multiplex signal is the same as the second control signal. According to the touch display device described in claim 1, wherein the common voltage transmission switches further include at least one third common voltage transmission switch, and the at least one third common voltage transmission switch receives a third common voltage, and Controlled by a third control signal to transmit the third common voltage to at least one third common electrode. For example, the touch display device described in claim 1 further includes: a plurality of data transmission lines coupled to the data transmission switch groups, wherein each data transmission line extends along a first direction, and each common electrode extends along a The second direction extends, and the first direction is parallel to the second direction. As described in the first item of the patent application, the size of each common voltage transmission switch is smaller than the size of the data transmission switch of each data transmission switch group. The touch display device as described in the first item of the patent application further includes: a common voltage generator coupled to the common voltage transmission switches to provide the common voltages. The touch display device according to claim 1, wherein the touch display panel includes: a first substrate; a plurality of data transmission lines arranged on a surface of the first substrate; a display medium layer configured Between the first substrate and a second substrate; the second substrate is disposed above the surface on the first substrate, wherein the common electrodes and the display pixels are disposed on the first substrate and the second substrate Between the substrates; and a touch substrate disposed on the first surface of the second substrate. A control method is applicable to a touch display device, wherein the touch display device includes a touch display panel, the touch display panel includes a plurality of display pixels, a plurality of common electrodes, a plurality of common voltage transmission switches, and A data transmission switch group, the control method includes: distinguishing the touch display panel into a plurality of display partitions, wherein each display partition includes the display pixels, and the common electrodes are respectively arranged on the display partitions; The common voltage transmission switches are respectively coupled to the common electrodes, and a plurality of control signals are respectively provided to the common voltage transmission switches, wherein the control signals are used to control whether the common voltage transmission switches respectively transmit multiple Sharing voltages to the common electrodes; and making the data transmission switch groups correspond to the common voltage transmission switches respectively, and provide multiple multiplexing signals to control the data transmission switch groups respectively, wherein each of the data transmission switch groups and The corresponding on or off states of the common voltage transmission switches are the same, wherein the steps of enabling the common voltage transmission switches to be respectively coupled to the common electrodes and respectively providing the control signals to the common voltage transmission switches include : Provide at least one first common voltage transmission switch to be coupled to at least one first common electrode, provide at least one second common voltage transmission switch to be coupled to at least one second common electrode; and transmit at least one first common voltage The switch transmits a first common voltage to the at least one first common electrode according to a first control signal, so that the at least one second common voltage transmission switch transmits a second common voltage to the at least one common electrode according to a second control signal The second common electrode, wherein the on and off states of the at least one first common voltage transmission switch and the at least one second common voltage transmission switch are different. For example, the control method described in item 10 of the scope of patent application, wherein the steps of making the data transmission switch groups correspond to the common voltage transmission switches and providing multiple multiplex signals to control the data transmission switch groups respectively include: At least one first data transmission switch group is coupled to a plurality of first pixels corresponding to at least one first common electrode; at least one second data transmission switch group is coupled to at least one second common electrode And providing a first multiplexing signal and a second multiplexing signal to respectively control the at least one first data transmission switch group and the at least one second data transmission switch group, wherein the A multiplex signal is the same as the first control signal, and the second multiplex signal is the same as the second control signal.

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