CN113485571A - Touch display driving method and related touch display system - Google Patents
Touch display driving method and related touch display system Download PDFInfo
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- CN113485571A CN113485571A CN202110674174.6A CN202110674174A CN113485571A CN 113485571 A CN113485571 A CN 113485571A CN 202110674174 A CN202110674174 A CN 202110674174A CN 113485571 A CN113485571 A CN 113485571A
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000758 substrate Substances 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 230000003139 buffering effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000699670 Mus sp. Species 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0412—Digitisers structurally integrated in a display
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
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Abstract
The application discloses a touch display driving method, which is used for a touch display system, wherein the touch display system comprises a display and a touch sensor, and the touch display driving method comprises the steps of transmitting a touch scanning signal to the touch sensor by a control unit so as to drive the touch sensor to perform touch sensing in a time interval; the time interval is located within the scanning line driving waveform of the gate driving circuit of the display and outside the data line driving waveforms of the source driving circuit of the display. The driving method and the touch display system can provide good touch accuracy and reduce system cost.
Description
Technical Field
The present disclosure relates to a touch display driving method and a related touch display system, and more particularly, to a driving method for improving a touch reporting rate and a related touch display system.
Background
With the progress and development of touch sensing technology, touch displays have been widely applied to various electronic devices, such as mobile phones, tablet computers, personal digital assistants, notebook computers, and other fixed or portable touch display devices, so as to replace conventional input devices, such as keyboards and mice, by touch sensing technology, thereby realizing more intuitive human-computer interfaces. However, as the thickness and quality requirements of users for the conventional electronic devices are higher and higher, manufacturers continue to develop touch displays with thinner profile, higher screen occupation and higher touch accuracy, so that the touch displays are gradually changed from the conventional Out-cell (Out-cell) architecture to the On-cell (In-cell) architecture, and the process of integrating the display panel and the touch sensor is performed to reduce the number of processes and reduce the thickness of the touch display. However, the touch sensor is closer to the display panel interference source, and the touch accuracy and sensitivity are affected.
Since signals driving the scan lines and the data lines of the display panel interfere with the touch sensor, in order to increase the Signal-to-Noise Ratio (SNR) of the touch sensor, the prior art generally performs touch sensing at the Vertical Blanking interval of the display driving. However, in order to provide sufficient touch sensing time, the vertical blanking interval needs to be widened, and the transmission Rate of the image data needs to be greatly increased under the condition of fixed Frame Rate (Frame Rate), which results in increased requirements of the overall system such as transmission lines, bus bars, display driving chips, and the like.
On the other hand, in the prior art, the driving timing of the scan lines and the data lines may be suspended once or more than once in a Frame (Frame) of the display to perform touch sensing during the suspension period, however, in this case, the display driving chip needs to additionally add a buffer to temporarily store a large amount of image data, which also causes a system burden.
Therefore, the conventional touch display driving method has additional requirements for the display driving chip and the display driving method, and how to design and improve the touch display without affecting the driving of the touch display becomes an urgent issue in the industry.
Disclosure of Invention
In order to solve the above problems, the present application provides a touch display driving method and a related touch display system, which can improve the touch reporting rate without changing the driving timing of the display, so as to provide a good touch accuracy and reduce the system cost.
The application discloses a touch display driving method, which is used for a touch display system, wherein the touch display system comprises a display and a touch sensor, and the touch display driving method comprises the steps of transmitting a touch scanning signal to the touch sensor by a control unit so as to drive the touch sensor to perform touch sensing in a time interval; the time interval is located within the scanning line driving waveform of the gate driving circuit of the display and outside the data line driving waveforms of the source driving circuit of the display.
The application further discloses a touch display system, which comprises a display, wherein the display comprises a display panel, a gate driving circuit and a source driving circuit; a touch sensor; and the control unit is coupled with the display and the touch sensor and transmits a touch scanning signal to drive the touch sensor to perform touch sensing in a time interval.
Drawings
Fig. 1 is a schematic view of a touch display system according to an embodiment of the present application.
Fig. 2 is a schematic diagram of driving timing sequences of a display and a touch sensor according to an embodiment of the present disclosure.
Fig. 3 is a schematic diagram of driving timing sequences of a display and a touch sensor according to another embodiment of the present disclosure.
Wherein the reference numerals are as follows:
10 touch display system
102 display
104 touch sensor
106 control unit
Gate (n), Gate (n +1) and Gate (n +2) scanning line driving signals
Gn, Gn +1, Gn +2 scanning line driving waveform
H-porch horizontal sync pulse timing
Interval established between Psn and Psn +1
Phn, Phn +1 maintenance interval
Source data line drive signal
Sn, Sn +1 data line drive waveform
T time interval
TGn +1 scan interval
TP touch control scanning signal
Detailed Description
Referring to fig. 1, fig. 1 is a schematic view of a touch display system 10 according to an embodiment of the present disclosure. The touch display system 10 may be a display system with a touch function, such as a smart phone and a tablet computer. The touch display system 10 includes a display 102, a touch sensor 104, and a control unit 106. The display 102 includes a display panel, wherein the display panel may be a Gate Driver on Array (GOA) panel, or the display 102 may include a Gate Driver chip for driving the display panel by using the Gate Driver; the display 102 further includes a Source Driver (Source Driver) chip for driving the display panel by using the Source Driver, and the gate Driver chip and the Source Driver chip can be integrated into a single chip, which is not limited in this application. The display 102 may further include a Timing Controller (Timing Controller) or a Common Driver (Common Driver), wherein the source Driver, the gate Driver and/or the Common Driver can drive each pixel of the display panel according to a synchronization signal of the Timing Controller.
Referring to fig. 1, the display 102 may include a touch sensor 104 (i.e., the touch sensor 104 is embedded in a display panel of the display 102), or may be independent from the touch sensor 104 (i.e., the touch sensor 104 is externally mounted on the display panel of the display 102). The control unit 106 is configured to transmit a touch scanning signal to drive the touch sensor 104 to perform touch sensing within the time interval T. The time interval T is within the scanning line driving waveforms of the gate driving circuit and is outside the data line driving waveforms of the source driving circuit, that is, the time interval T may be within the scanning line driving timing and outside the data line driving timing of the display 102. In an embodiment, the control unit 106 may be a driving unit of the touch sensor 104, for sending the touch scanning signal to the sensing electrode of the driving touch sensor 104, and receiving the touch sensing signal by the receiving electrode of the driving touch sensor 104, so as to drive the touch sensor 104 for touch sensing. In this way, by performing touch sensing in the time interval T, the touch display system 10 of the present application can perform touch sensing without changing the driving timing of the display 102, so as to provide a higher touch Report Rate (Report Rate).
More specifically, for example, a gate driver on a substrate panel (hereinafter referred to as "GOA panel"), the GOA panel will make a gate driver on a Thin Film Transistor (TFT) array substrate to replace a gate driver chip externally connected to a silicon wafer, and apply the gate driver around the panel, thereby reducing the process and the product cost, and meeting the narrow frame requirement of electronic products. The scanning line driving waveform generated by the gate driving circuit of the prior GOA panel has the function of pre-charging, and the data line driving waveform corresponding to the scanning line driving waveform falls before and after the falling edge of the scanning line driving waveform. In order to make the pixels of the display panel have sufficient charging time without blocking the wrong display driving voltage, the data line driving waveforms need to satisfy the minimum setup time and the minimum sustain time before and after the falling edge of the corresponding scan line driving waveform, and the touch display system 10 of the present application performs touch sensing in the time interval T inside the scan line driving waveform and outside the data line driving waveform. Therefore, the touch display system 10 of the present application can achieve a higher touch reporting rate without suspending the driving of the scan lines and the data lines, increasing the data transmission rate of the display, and changing the driving timing sequence and extra data buffering of the display, without affecting the display effect.
Please refer to fig. 2, which is a schematic diagram of a driving timing sequence of the display 102 according to an embodiment of the present disclosure. As shown in fig. 2, the two scanning line driving signals Gate (n), Gate (n +1) have a scanning line driving waveform Gn and a scanning line driving waveform Gn +1, respectively, and the two scanning line driving signals Gate (n), Gate (n +1) are output to two adjacent scanning lines on the display panel, respectively. Wherein the scanning line driving waveform Gn +1 has a scanning section TGn +1, the scanning section TGn +1 being from a falling edge of a previous scanning line driving waveform Gn to a falling edge of the scanning line driving waveform Gn + 1. The data line driving signal Source is output to a data line on the display panel, the two scanning lines cross the data line, and the data line driving signal Source has a data line driving waveform Sn and a data line driving waveform Sn +1 corresponding to the two scanning line driving waveforms Gn and Gn +1, respectively. The data line driving waveform Sn and the data line driving waveform Sn +1 respectively have setup intervals Psn and Psn +1 and sustain intervals Phn and Phn + 1. The set-up intervals Psn and Psn +1 are intervals in which the data line driving waveform starts to rise to the display driving voltage and is maintained to the falling edge of the scanning line driving waveform; the sustain intervals Phn and Phn +1 are intervals in which the data line driving waveform is maintained at the display driving voltage after the falling edge of the scanning line driving waveform is completed. Since the scan interval TGn +1 corresponding to the scan line driving waveform Gn +1 overlaps with the sustain interval Phn of the previous data line driving waveform Sn and the setup interval Psn +1 of the data line driving waveform Sn +1 corresponding to the scan line driving waveform Gn +1, the time interval T is provided within the scan interval TGn +1 of the scan line driving waveform Gn +1 and outside the data line driving waveforms Sn and Sn +1, and the source driving circuit of the display 102 does not drive the data line within the time interval T, so the control unit 106 can transmit the touch scanning signal TP to drive the touch sensor 104 for touch sensing in the time interval T.
It should be noted that, within the scanning interval TGn +1, the scanning line driving waveform Gn +1 has no state change, and therefore, the touch sensing is not affected. Similarly, the data line driving signal has no state change except the data line driving waveforms Sn and Sn +1, and therefore, the touch sensing is not affected. In this way, when the display 102 drives the scan lines, the touch display system 10 of the present application can effectively increase the dot reporting rate of the touch sensor 104 without increasing the width of the Vertical Blanking interval (Vertical Blanking Period) and without suspending driving the scan lines or the data lines, so as to improve the touch accuracy.
In the following, a simple evaluation is performed, and in one embodiment, taking a display with a High Definition (HD) display panel as an example 102, the HD display panel has 1280 scan lines, and if the Frame Rate (Frame Rate) is 60Hz, the scan time of one scan line is about 12.4 microseconds (μ s). Assuming a touch sensor load of 5K ohms (Ω), a capacitance of 200 picofarads (pF), a transmit terminal voltage of 2.2 volts (V), and a receiving terminal charging rate of 45%, a charge-discharge time of the touch sensor 104 (i.e., a time required to perform touch sensing) is less than 1.5 μ s. That is, the setup interval and the sustain interval remaining for the data line driving waveform are still more than 10us, which is very sufficient for setting up the display driving voltage. Since the touch sensor 104 performs touch sensing according to the touch scan signal TP transmitted by the control unit 106, the touch sensing can be performed without interfering with the driving signal of the display 102 when the touch scan signal TP is controlled to be transmitted in the time interval T and reaches the required voltage level.
It is noted that the scan line driving waveforms and the data line driving waveforms are not limited to the waveforms shown in FIG. 2, and there will be different scan line driving waveforms and data line driving waveforms according to different displays 102. The number of times that the control unit 106 drives the touch sensor 104 to perform touch sensing in the time interval T is not limited to one, and the control unit 106 may adjust the number of times that the touch sensor 104 performs touch sensing according to the length of the time interval T, the length of the scanning interval of the scanning line driving waveforms Gn and Gn +1, the lengths of the setup intervals Psn and Psn +1 and the sustain intervals Phn and Phn +1 of the data line driving waveforms Sn and Sn + 1. For example, in the above embodiment, since the scanning interval TGn +1 is 12.4 μ s, and the time for the touch sensor 104 to perform touch sensing each time is less than 1.5 μ s, in this case, the control unit 106 can drive the touch sensor 104 to perform touch sensing twice. In this way, the touch hit rate of the touch display system 10 can be increased with the increase of the sensing times of the touch sensor 104, and the touch hit rate equal to or greater than 120Hz is achieved on the display panel with 60 Hz.
In another embodiment, the control unit 106 can further drive the touch sensor 104 according to the synchronization signal. In detail, the control unit 106 can control the synchronization relationship of the driving waveforms between the display 102 and the touch sensor 104 more precisely according to the Horizontal pulse timing (H-pulse) in the Horizontal Blanking interval (Horizontal Blanking Period) of the synchronization signal generated by the timing control circuit (not shown) of the display 102. The horizontal synchronization pulse timing H-Porch may refer to a sum interval of a horizontal synchronization waveform together with a Horizontal Front Porch (HFP) and a Horizontal Back Porch (HBP). Specifically, please refer to fig. 3, which is a schematic diagram of a driving timing sequence of the display 102 according to an embodiment of the present disclosure. As shown in fig. 3, each of the scan line driving signals Gate (n), Gate (n +1), and Gate (n +2) has a scan line driving waveform Gn, Gn +1, and Gn +2, respectively, and the data line driving signal Source has a data line driving waveform Sn and a data line driving waveform Sn +1 corresponding to the two scan line driving waveforms Gn and Gn +1, respectively. For example, the source driving circuit of the display 102 may determine the driving timing of the scanning line driving signal and the data line driving signal of the display 102 according to the horizontal synchronization pulse timing H-porch, for example, the corresponding data line driving waveform Sn enters the sustain interval Phn after the falling edge of the previous scanning line driving waveform Gn is ended; alternatively, the next data line driving waveform Sn +1 is allowed to enter the setup interval Psn +1 after the previous data line driving waveform Sn is ended and delayed for a certain time. The data line driving signal is not changed in state in the horizontal synchronization pulse timing H-porch. That is, the horizontal synchronization pulse timing H-porch must be located in the time interval T. In this way, the touch sensor 104 can perform touch sensing according to the touch scanning signal TP output by the control unit 106 within each horizontal synchronization pulse timing H-porch in the horizontal blanking interval.
The control unit 106 can use each horizontal synchronization pulse timing H-porch in the horizontal blanking interval as a synchronization signal to synchronize the touch driving waveform (touch scanning signal TP) received by the touch sensor 104 with the display driving waveform (data line driving signal Source) received by the display panel of the display 102, so as to more precisely control the relative relationship between the driving waveform of the touch sensor 104 and the driving waveform of the display 102. However, the touch and display synchronization method may be that the display 102 provides a synchronization signal to the touch sensor 104, or the display 102 and the touch sensor 104 are synchronized with the system side. It should be noted that the number of times that the control unit 106 transmits the touch scan signal TP to drive the touch sensor 104 to perform touch sensing is not limited to one time. That is, in the present embodiment, the control unit 106 can length-adjust the number of times the touch sensor 104 performs touch sensing according to the signal of the horizontal synchronization pulse timing H-porch, but not limited thereto.
It should be noted that the foregoing embodiments are provided to illustrate the spirit of the present application, and those skilled in the art can make appropriate modifications without limitation thereto. Specifically, considering the actual reporting rate requirement and power consumption of the system, the touch sensor 104 may not need to perform touch sensing in each time interval T (or horizontal synchronization pulse timing H-porch), and may adjust the sensing frequency and times according to the system requirement. For example, for the HD display panel, if every 80 scan lines are used as a period, as long as two touch sensing operations are performed in one period, at least 32 touch sensing operations can be performed in one frame, so as to obtain a touch reporting rate exceeding 30 Hz; it is also within the scope of the present application that the touch hit rate exceeding 60Hz can be obtained by performing four touch sensing operations in one cycle.
In summary, in the embodiments of the present application, the touch sensor is driven to perform touch sensing in a specific time interval, so that when the display drives the scan lines, the dot reporting rate of the touch sensor can be effectively increased without increasing the width of the vertical blanking interval or suspending driving the scan lines or the data lines. Therefore, the touch control accuracy can be improved without influencing the display effect without increasing the data transmission rate of the display, changing the driving time sequence of the display and extra data buffering.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (14)
1. A touch display driving method is used for a touch display system, wherein the touch display system comprises a display and a touch sensor, and the touch display driving method comprises the following steps:
transmitting a touch scanning signal to the touch sensor by using a control unit so as to drive the touch sensor to perform touch sensing in a time interval;
the time interval is located within the scanning line driving waveform of the gate driving circuit of the display and outside the data line driving waveforms of the source driving circuit of the display.
2. The touch display driving method according to claim 1, further comprising:
the gate driving circuit respectively outputs a first scanning line driving signal and a second scanning line driving signal to two scanning lines of the display panel, the first scanning line driving signal has a first scanning line driving waveform, the second scanning line driving signal has a second scanning line driving waveform, the second scanning line driving waveform has a scanning interval, the scanning interval is from a falling edge of the first scanning line driving waveform to a falling edge of the second scanning line driving waveform, and the time interval is within the scanning interval.
3. The touch display driving method according to claim 2, further comprising:
the source electrode driving circuit outputs a data line driving signal to one data line of the display panel, the data line driving signal has a first data line driving waveform corresponding to the first scanning line driving waveform and a second data line driving waveform corresponding to the second scanning line driving waveform, and the time interval is located outside the first data line driving waveform and the second data line driving waveform.
4. The touch display driving method according to claim 1, further comprising:
the display includes a synchronization signal having a Horizontal Blanking Interval (Horizontal Blanking Interval) in which a Horizontal synchronization pulse timing (Horizontal Porch) is located in the time Interval, and the control unit transmits the touch scan signal to the touch sensor at the Horizontal synchronization pulse timing.
5. The touch display driving method according to claim 4, wherein the synchronization signal is generated by a timing control circuit, and the source driver circuit and the gate driver drive the display panel according to the synchronization signal.
6. The touch display driving method according to claim 1, wherein the display comprises a Gate Driver on Array (GOA) panel.
7. The touch display driving method according to claim 1, wherein the control unit drives the touch sensor to execute several times within the time interval.
8. A touch display system includes:
the display comprises a display panel, a gate driving circuit and a source driving circuit;
a touch sensor; and
the control unit is coupled with the display and the touch sensor and transmits a touch scanning signal to drive the touch sensor to perform touch sensing in a time interval;
the time interval is located within the scanning line driving waveform of the gate driving circuit and outside the data line driving waveforms of the source driving circuit.
9. The touch display system of claim 8, further comprising:
the gate driving circuit respectively outputs a first scanning line driving signal and a second scanning line driving signal to two scanning lines of the display panel, the first scanning line driving signal has a first scanning line driving waveform, the second scanning line driving signal has a second scanning line driving waveform, the second scanning line driving waveform has a scanning interval, the scanning interval is from a falling edge of the first scanning line driving waveform to a falling edge of the second scanning line driving waveform, and the time interval is within the scanning interval.
10. The touch display system of claim 9, further comprising:
the source electrode driving circuit outputs a data line driving signal to one data line of the display panel, the data line driving signal has a first data line driving waveform corresponding to the first scanning line driving waveform and a second data line driving waveform corresponding to the second scanning line driving waveform, and the time interval is located outside the first data line driving waveform and the second data line driving waveform.
11. The touch display system of claim 8, wherein the display comprises a timing control circuit, the timing control circuit generates a synchronization signal, and the source driver circuit and the gate driver drive the display panel according to the synchronization signal.
12. The touch display system of claim 11, wherein the synchronization signal has a horizontal blanking interval, a horizontal synchronization pulse timing of the horizontal blanking interval is located in the time interval, and the control unit transmits the touch scan signal to the touch sensor at the horizontal synchronization pulse timing.
13. The touch display system of claim 8, wherein the display panel is a gate driver circuit substrate panel.
14. The touch display system according to claim 8, wherein the control unit drives the touch sensor to execute several times within the time interval.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW110120596A TWI761224B (en) | 2021-06-07 | 2021-06-07 | Touch display driving method and touch display system using the same |
| TW110120596 | 2021-06-07 |
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| CN113485571A true CN113485571A (en) | 2021-10-08 |
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| CN202110674174.6A Pending CN113485571A (en) | 2021-06-07 | 2021-06-17 | Touch display driving method and related touch display system |
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| TW (1) | TWI761224B (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| TWI761224B (en) | 2022-04-11 |
| TW202248822A (en) | 2022-12-16 |
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Effective date of registration: 20240206 Address after: 19th Floor, Building J2A, Phase II of Innovation Industry Park, No. 2800 Innovation Avenue, High tech Zone, Hefei City, Anhui Province Applicant after: Hefei Chuangfa Microelectronics Co.,Ltd. Country or region after: China Address before: Hsinchu County, Taiwan, China Applicant before: FORCELEAD TECHNOLOGIES Corp. Country or region before: Taiwan, China |