WO2019228240A1 - 触控电路、触控检测方法、显示面板及显示装置 - Google Patents
触控电路、触控检测方法、显示面板及显示装置 Download PDFInfo
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- WO2019228240A1 WO2019228240A1 PCT/CN2019/087985 CN2019087985W WO2019228240A1 WO 2019228240 A1 WO2019228240 A1 WO 2019228240A1 CN 2019087985 W CN2019087985 W CN 2019087985W WO 2019228240 A1 WO2019228240 A1 WO 2019228240A1
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- touch
- signal
- electrode
- terminal
- display panel
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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
- G06F3/0418—Control or interface arrangements specially adapted for digitisers for error correction or compensation, e.g. based on parallax, calibration or alignment
- G06F3/04184—Synchronisation with the driving of the display or the backlighting unit to avoid interferences generated internally
-
- 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
-
- 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
- G06F3/04164—Connections between sensors and controllers, e.g. routing lines between electrodes and connection pads
-
- 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
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0443—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a single layer of sensing electrodes
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/044—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means
- G06F3/0446—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means by capacitive means using a grid-like structure of electrodes in at least two directions, e.g. using row and column electrodes
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/40—OLEDs integrated with touch screens
Definitions
- the present invention relates generally to display technology, and in particular, to a touch circuit, a touch detection method, a display panel, and a display device.
- Touch technologies include self-capacitive touch technology and mutual-capacitive touch technology.
- self-capacitive touch technology is widely used in various display technology fields with its simple structure, such as OLED, AMOLED and other display technology fields.
- a self-capacitive touch circuit generally includes a touch signal line and a touch electrode.
- a touch subject such as a finger
- the touch electrode changes the voltage on the touch electrode due to capacitive coupling.
- the touch signal line can determine the touch position of the touch subject by sensing the voltage change on the touch electrodes.
- the voltage signal on the touch electrode is attenuated during the transmission of the touch signal line.
- the length of the required touch signal line becomes longer and longer, and a longer touch signal The line will seriously affect the detection of the voltage change of the touch electrode, thereby affecting the accuracy of touch detection.
- the invention provides a touch circuit, which includes a touch electrode, a touch signal line, and a driving transistor.
- a control terminal of the driving transistor is connected to the touch electrode, a first terminal of the driving transistor receives a first power signal, and a second terminal of the driving transistor is connected to the touch signal line, and is used for The voltage signal outputs a current signal to the touch signal line.
- the touch circuit further includes at least one first switching transistor, a control terminal of the first switching transistor receives a first control signal, and the first terminal of the first switching transistor and the touch control The electrodes are connected, the second end of the first switching transistor receives a second power signal, and the first switching transistor is used to charge the touch electrode by using the second power signal in response to the first control signal.
- the touch circuit further includes a capacitor device, a first terminal of the capacitor device is connected to a control terminal of the driving transistor, and a second terminal of the capacitor device receives a second control signal.
- the touch circuit further includes: at least one second switching transistor, a control terminal of the second switching transistor receives a third control signal, and a first terminal of the second switching transistor is in contact with the contact.
- the control electrode is connected, the second end of the second switching transistor receives a second power signal, and the second switching transistor is used to charge the touch electrode by using the second power signal in response to the third control signal.
- the touch circuit is provided on a display panel including a gate driving circuit; the first control signal, the second control signal, and the third control signal share the gate driving.
- the scanning signal provided by the circuit; wherein the driving timing of the second control signal is earlier than the third control signal and later than the first control signal.
- the invention also provides a display panel, which is characterized by comprising the touch circuit described above.
- the display panel further includes a plurality of driving electrodes extending along the first direction and distributed along the second direction, and each of the driving electrodes includes a plurality of first electrode blocks intersected at intervals and A second electrode block; wherein the first electrode block is used as the touch electrode; the second electrode block is used to provide a power signal to a driving circuit of the display panel and to provide the second power signal .
- a plurality of touch circuits provided on the same driving electrode are connected to the same touch signal line.
- a size of each of the touch electrodes in the first direction changes along the second direction.
- the present invention also provides a touch detection method using the above-mentioned touch circuit, which is characterized in that it includes:
- the touch position is determined according to the current signal.
- the present invention also provides a display device including the above display panel.
- FIG. 1 is a schematic structural diagram of an exemplary embodiment of a touch circuit according to the present disclosure
- FIG. 2 is a schematic structural diagram of an exemplary embodiment of a display panel of the present disclosure
- FIG. 3 is a circuit diagram of a touch circuit in an exemplary embodiment of a display panel of the present disclosure
- FIG. 4 is a timing diagram of a control signal in an exemplary embodiment of a touch circuit of the present disclosure
- FIG. 5 is a schematic structural diagram of a touch circuit of a display panel in the related art
- FIG. 6 is a schematic structural diagram of a touch electrode in an exemplary embodiment of a display panel of the present disclosure
- FIG. 7 is a flowchart of an exemplary embodiment of a touch detection method according to the present disclosure.
- FIG. 1 is a schematic structural diagram of an exemplary embodiment of a touch circuit of the present disclosure.
- the touch circuit includes: a touch electrode 1, a touch signal line 2, and a driving transistor 3.
- a control terminal of the driving transistor 3 is connected to the touch electrode 1, a first terminal of the driving transistor 3 receives a first power signal Vin, and a second terminal of the driving transistor is connected to the touch signal line for The voltage signal of the touch electrode outputs a current signal to the touch signal line.
- the driving transistor may be a P-channel thin film transistor or an N-channel thin film transistor.
- the present exemplary embodiment is described using a P-channel thin film transistor as an example.
- the first terminal of the driving transistor 3 is a source
- the second terminal is a drain
- the control terminal is a gate.
- the source of the driving transistor 3 receives the first power signal Vin
- the drain of the driving transistor 3 is connected to the touch signal line 2
- the gate of the driving transistor 3 is connected to the touch electrode.
- Vg the driving transistor 3
- the gate voltage Vs is the source voltage of the driving transistor 3
- k the mobility of the driving transistor 3
- Vth the threshold voltage of the driving transistor 3.
- Vg is equal to the voltage of the touch electrode
- Vs is equal to Vin
- k and Vth are constant values. Therefore, it can be seen that the drain output current Iout of the driving transistor 3 is only related to the voltage of the touch electrode.
- the change in the touch electrode voltage can be determined based on the change in the drain output current Iout of the driving transistor 3.
- the touch main body such as a finger
- the voltage of the touch electrode is changed. Therefore, the touch condition of the touch electrode can be detected by detecting the drain output current Iout of the driving transistor 3.
- the touch circuit proposed by the present invention uses a driving transistor to convert the voltage signal of the touch electrode into a current signal.
- the attenuation of the voltage signal on the touch electrode on the touch line is avoided, thereby improving the accuracy of touch detection.
- the touch circuit has a simple structure and low cost.
- FIG. 2 is a schematic structural diagram of an exemplary embodiment of a display panel of the present disclosure
- FIG. 3 is a circuit diagram of a touch circuit in an exemplary embodiment of a display panel of the present disclosure.
- the display panel may include a plurality of driving electrodes 5 extending along the first direction and spaced apart along the second direction, and each of the driving electrodes 5 may include a plurality of first electrode blocks 51 and second electrode blocks that are spaced and crossed. 52; wherein the first electrode block 51 can be used as the touch electrode 1; the second electrode block 52 is used to provide a power signal to a driving circuit of the display panel.
- the driving electrode 5 may be a cathode or an anode. In this exemplary embodiment, the driving electrode 5 is used as an example for description. All the second electrode blocks 52 in the display panel are electrically connected and have an output voltage VSS.
- the display panel provided in this exemplary embodiment shares the first electrode block as a touch electrode.
- this arrangement reduces the cross-wire nodes, thereby reducing the parasitic capacitance between the wires and improving the display effect; This setting avoids additional touch layers, reduces the number of wirings, simplifies the process, and saves costs.
- the touch circuit may further include at least one first switching transistor 4, a control terminal of the first switching transistor 4 receives a first control signal S1, and the first switching transistor The first end of 4 is connected to the first electrode block 51, the second end of the first switching transistor 4 receives a second power signal, and the first switching transistor 4 is used in response to the first control signal S1 to use the second A power signal charges the first electrode block 51.
- the touch circuit may further include a capacitor device 6, and a first terminal of the capacitor device 6 is connected to a control terminal of the driving transistor 3.
- the second terminal of the capacitive device 6 receives a second control signal S2.
- the first switching transistor 4 may be disposed on the second electrode block 52, and the second power source signal may be provided by the second electrode block 52. At this time, the voltage of the second power source signal is VSS, and the first electrode block 51 is at The voltage under the second voltage signal is VSS.
- the first switching transistor 4 may be selected as a P-channel thin film transistor, the second power signal provided by the second electrode block 52 may be greater than the threshold voltage of the first switching transistor 4, and the second control signal S2 may be a pulse signal.
- the second control signal S2 When the second control signal S2 is at a high level, the voltage at the control terminal of the driving transistor 3 is equal to VSS. At this time, the driving transistor is not turned on and the touch circuit does not perform touch detection.
- the second control signal S2 When the second control signal S2 is at a low level, the capacitor A voltage drop occurs at the first terminal of the device 6 due to the voltage drop at the second terminal, so that the voltage of the control terminal of the driving transistor 3 connected to the first terminal of the capacitor device 6 also drops. At this time, the voltage of the control terminal of the driving transistor is smaller than the first switch.
- the threshold voltage of the transistor 4 turns on the driving transistor 3 and the touch circuit performs touch detection.
- the present exemplary embodiment realizes the control of the touch detection period by the setting of the capacitive device 6.
- the driving electrode 5 may also be an anode
- the driving transistor may be an N-channel thin film transistor
- the first switching transistor 4 may be selected as an N-channel thin film transistor
- the second electrode The second power signal provided by the block 52 may be smaller than the threshold voltage of the first switching transistor 4, which all belong to the protection scope of the present disclosure.
- the first electrode block 51 will release charges, and the voltage on the first electrode block 51 will change. Because the first electrode block 51 and the second electrode block 52 form a capacitor structure, when the voltage on the first electrode block 51 changes, the voltage on the second electrode block 52 will be affected, and eventually the display panel displays abnormally.
- the touch circuit further includes: at least one second switching transistor 7, a control terminal of the second switching transistor 7 receives a third control signal S3, and a first terminal of the second switching transistor 7 and The first electrode block 51 is connected, and the second terminal of the second switching transistor 7 can receive the second power signal, and the second switching transistor is used to respond to the third control signal to the second power signal using the second power signal.
- the first electrode block 51 is charged.
- the third control signal charges the first electrode block 51 with the second power signal after the first electrode block 51 is discharged, so that the voltages of the first electrode block 51 and the second electrode block 52 are the same, and the first electrode Block 51 does not affect normal display.
- the first control signal S1, the second control signal S2, and the third control signal S3 may share a scan signal provided by a gate driving circuit in a display panel; wherein, the second The driving timing of the control signal S2 is earlier than the third control signal S3 and later than the first control signal S1.
- the gate driving circuit generates scanning signals to the pixel driving circuit row by row according to the time sequence.
- the first control signal S1 can share the scanning signals of the pixels in the previous row
- the second control signal S2 can share the scanning signals of the pixels in the middle row.
- the third control signal S3 can share the scanning signals of the pixels in the next row.
- the pixels in the previous row, the pixels in the middle row, and the pixels in the next row refer to three rows of pixels having a relative position relationship in the display panel, and the three rows of pixels may be adjacent or spaced apart.
- the first control signal S1, the second control signal S2, and the third control signal S3 of the touch circuit share a scanning signal provided by the gate driving circuit to implement touch and
- the display is performed synchronously, so that it is not necessary to set a touch period separately, thereby increasing the display time. This setting avoids the technical problem of short service life of the display panel caused by the short display time in the related art when the normal display is maintained by increasing the brightness of the light-emitting element.
- FIG. 4 it is a timing diagram of control signals in an exemplary embodiment of a touch circuit of the present disclosure.
- S1 is low level
- S2 is high level
- S3 is high level.
- the first switching transistor is turned on
- the second switching transistor is turned off
- the first electrode block 51 is at the second power signal.
- S1 is high level
- S2 is low level
- S3 high Level
- the first terminal of the capacitor device 6 undergoes a voltage drop due to the voltage drop of the second terminal, so that the drive connected to the first terminal of the capacitor device 6 is driven.
- the voltage Vgate at the control terminal of the transistor 3 drops to VSS + ⁇ V, where ⁇ V is the voltage variable of the second control signal.
- the voltage at the control terminal of the driving transistor is less than the threshold voltage of the first switching transistor 4, and the driving transistor 3 is turned on without contact.
- FIG. 5 it is a schematic structural diagram of a touch circuit of a display panel in the related art.
- Each touch electrode 500 is connected to a detection line 501.
- multiple touch circuits provided on the same driving electrode 5 may be connected to the same touch signal line 2. This setting can reduce the number of pins of the detection unit connected to the touch signal line, and reduce the cost of the detection unit.
- FIG. 6 it is a schematic structural diagram of a touch electrode in an exemplary embodiment of a display panel of the present disclosure.
- the size of each of the touch electrodes (ie, the first electrode block 51) in the first direction changes along the second direction.
- FIG. 6 there are two touch points A and B on the first electrode block 51.
- the area around touch point A is larger than the area around touch point B.
- Specific touch positions can be obtained through different capacitance changes.
- FIG. 6 there are two touch points C and D on the second electrode block 52.
- the touch point C is closer to the first electrode block 51, and the touch point D is farther from the first electrode block 51.
- the size of the first electrode block 51 in the first direction changes stepwise along the second direction. It should be understood that there are more ways to change the size of the first electrode block 51 in the first direction along the second direction.
- This exemplary embodiment also provides a touch detection method.
- the touch circuit described above is applied.
- FIG. 7 it is a flowchart in an exemplary embodiment of the touch detection method of the present disclosure. The method includes:
- the touch detection method provided in this exemplary embodiment has the same technical features and working principles as the touch circuit described above, and the above content has been described in detail, and is not repeated here.
- the present invention also provides a display device including the above display panel.
- the specific type of the display device is not particularly limited, and may be any type of display device commonly used in the art, such as an OLED display.
- the display device provided in this exemplary embodiment has the same technical features and working principles as the display panel described above, and the above content has been described in detail, and is not repeated here.
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Abstract
Description
Claims (11)
- 一种触控电路,包括:触控电极;触控信号线;驱动晶体管,所述驱动晶体管的控制端与所述触控电极连接,第一端接收第一电源信号,第二端与所述触控信号线连接,用于根据所述触控电极的电压信号向所述触控信号线输出电流信号。
- 根据权利要求1所述的触控电路,还包括:至少一个第一开关晶体管,所述第一开关晶体管的控制端接收第一控制信号,第一端与所述触控电极连接,第二端接收第二电源信号,用于响应所述第一控制信号利用所述第二电源信号对所述触控电极充电。
- 根据权利要求2所述的触控电路,还包括:电容器件,所述电容器件的第一端与所述驱动晶体管的控制端连接,第二端接收一第二控制信号。
- 根据权利要求3所述的触控电路,还包括:至少一个第二开关晶体管,所述第二开关晶体管的控制端接收第三控制信号,第一端与所述触控电极连接,第二端接收所述第二电源信号,用于响应所述第三控制信号利用所述第二电源信号对所述触控电极充电。
- 根据权利要求4所述的触控电路,其中,所述触控电路设于包括栅极驱动电路的显示面板;所述第一控制信号、所述第二控制信号以及所述第三控制信号共用所述栅极驱动电路提供的扫描信号;其中,所述第二控制信号的驱动时序先于所述第三控制信号且晚于所述第一控制信号。
- 一种显示面板,包括权利要求1-5任一项所述的触控电路。
- 根据权利要求6所述的显示面板,还包括多条沿第一方向延伸且沿第二方向间隔分布的驱动电极,每一所述驱动电极均包括多个间隔交叉分布的第一电极块和第二电极块;其中,所述第一电极块用作所述触控电极;所述第二电极块用于向所述显示面板的驱动电路提供电源信号。
- 根据权利要求7所述的显示面板,其中,连接于同一所述驱动电极的多个触控电路共用于同一条所述触控信号线。
- 根据权利要求7或8所述的显示面板,其中,每一个所述触控电极在所述第一方向上的尺寸沿所述第二方向变化。
- 一种触控检测方法,应用权利要求1-5任一项所述的触控电路,包括:向触控电极充电;利用驱动晶体管将所述触控电极的电压信号转化为电流信号;根据所述电流信号判断触控位置。
- 一种显示装置,包括权利要求6-9任一项所述的显示面板。
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US16/620,606 US11132084B2 (en) | 2018-05-31 | 2019-05-22 | Touch circuit, touch detection method, display panel and display device |
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CN108415624B (zh) | 2018-05-31 | 2020-07-28 | 京东方科技集团股份有限公司 | 触控电路、触控检测方法、显示面板及显示装置 |
CN111078054B (zh) * | 2019-12-20 | 2023-07-07 | 京东方科技集团股份有限公司 | 触控检测装置及其控制方法、显示模组 |
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