CN109885204B - Touch display method, touch display control circuit and touch display device - Google Patents
Touch display method, touch display control circuit and touch display device Download PDFInfo
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- CN109885204B CN109885204B CN201910150728.5A CN201910150728A CN109885204B CN 109885204 B CN109885204 B CN 109885204B CN 201910150728 A CN201910150728 A CN 201910150728A CN 109885204 B CN109885204 B CN 109885204B
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Abstract
The embodiment of the invention provides a touch display method, which is applied to a touch display device and comprises the following steps: step S1, acquiring an original touch scanning signal and an original display scanning signal of a current frame; step S2, dividing the period of the original display scan signal in the active state of the current frame into a plurality of discontinuous sub-active periods to generate a target display scan signal, where the period of the original touch scan signal in the active state corresponds to the interval period of each sub-active period of the target display scan signal; step S3, performing a touch operation according to the original touch scan signal and performing a display operation according to the target display scan signal. The touch display method provided by the embodiment of the invention can improve the touch precision. The embodiment of the invention also provides a touch display control circuit and a touch display device.
Description
Technical Field
The present invention relates to the field of optoelectronic technologies, and in particular, to a touch display method, a storage medium, and a touch display device.
Background
The existing intelligent equipment is generally configured with a display function and a touch function at the same time, one type of intelligent equipment adopts a time-sharing display and touch mode, and the other type of intelligent equipment can simultaneously execute the display function and the touch function. In the liquid crystal display device, for example, the thin film transistor disposed on the substrate drives the liquid crystal molecules to rotate to perform display.
The display signals comprise grid scanning signals and display scanning signals, the grid scanning signals are used for controlling the thin film transistor to be conducted when being output to high level, the display scanning signals are used for outputting high level, and the rotation angle of liquid crystal molecules is controlled to realize the display of corresponding pictures. And the grid scanning signal output is at low level and is used for controlling the thin film transistor to be switched off. When the display function and the touch function are simultaneously executed, the grid scanning signal, the display scanning signal and the touch signal are respectively output at a preset frequency. At a certain moment, if the touch signal and the display scan signal output high levels at the same time, the touch signal is affected by the gate scan signal (mainly, the on state and the off state of the thin film transistor are switched, and the corresponding gate scan signal jumps between the high level and the low level, and at this time, the pressure difference is large), which may cause the touch accuracy to be misaligned.
Disclosure of Invention
The invention provides a touch display method applied to a touch display device, which comprises the following steps:
step S1, acquiring an original touch scanning signal and an original display scanning signal of a current frame;
step S2, dividing the period of the original display scan signal in the active state of the current frame into a plurality of discontinuous sub-active periods to generate the target display scan signal, where the period of the original touch scan signal in the active state corresponds to the interval period of each sub-active period of the target display scan signal;
step S3, performing a touch operation according to the original touch scan signal and performing a display operation according to the target display scan signal.
Another aspect of the present invention provides a touch display control circuit, including:
the signal acquisition module is used for acquiring an original touch scanning signal and an original display scanning signal of a current frame;
the signal modulation module is used for modulating the frequency and the pulse width of the original display scanning signal to generate a target display scanning signal, and the target display scanning signal and the original touch scanning signal are not in an effective state at the same time; and
and the touch display control module is used for executing touch operation according to the original touch scanning signal and executing display operation according to the target display scanning signal.
Another aspect of the present invention provides a touch display device, including a processor and a memory, where the memory stores a computer program, and the computer program, when executed by the processor, can implement the steps of the touch display method as described above.
According to the touch display method provided by the embodiment of the invention, the frequency and the pulse width of the original display scanning signal are modulated according to the original touch scanning signal and the original display scanning signal so as to generate the target display scanning signal, so that the target display scanning signal and the original touch scanning signal are not in an effective state at the same time, the interference of the grid scanning signal on touch is avoided, and the touch precision is favorably improved.
Drawings
Fig. 1 is a schematic step flow diagram of a touch display method according to an embodiment of the present invention.
Fig. 2 is a flowchart illustrating another step of the touch display method according to the embodiment of the invention.
Fig. 3 is a detailed flowchart of step S2 in fig. 1.
Fig. 4 is a detailed flowchart of step S21 in fig. 3.
Fig. 5 shows the original signal output waveform in one frame of image.
Fig. 6 is a schematic circuit diagram of a differentiating circuit according to an embodiment of the present invention.
Fig. 7 is a schematic diagram of an output waveform of the differentiating circuit in fig. 6.
Fig. 8 is a schematic circuit diagram of a counter according to an embodiment of the present invention.
Fig. 9 is a schematic diagram of a corresponding signal waveform in step S22.
Fig. 10 is a schematic block diagram of a touch display control circuit according to an embodiment of the present invention.
Fig. 11 is a schematic block diagram of a touch display device according to an embodiment of the present invention.
Description of the main elements
The following detailed description will further illustrate the invention in conjunction with the above-described figures.
Detailed Description
Referring to fig. 1, the touch display method provided in the present embodiment includes:
step S1, acquiring an original touch scanning signal and an original display scanning signal of a current frame;
step S2, dividing the period of the original display scan signal of the current frame in the valid state into a plurality of discontinuous sub-valid periods to generate a target display scan signal, wherein the period of the original touch scan signal in the valid state corresponds to the interval period of each sub-valid period of the target display scan signal;
step S3, performing a touch operation according to the original touch scan signal and performing a display operation according to the target display scan signal.
The touch display method provided in this embodiment is applied to a touch display device, which may be a liquid crystal display, a light emitting diode display, or the like. In the liquid crystal display, a touch function and a display function are configured at the same time. The lcd includes a plurality of touch driving electrodes for touch control, a liquid crystal layer, and a driving element (generally, a thin film transistor) for controlling a rotation angle of liquid crystal molecules of the liquid crystal layer.
In step S1, the original touch scan signal is used to output to the touch electrode according to a preset rule to implement a touch function, the original display scan signal is used to output to the driving element according to a preset rule to control the liquid crystal molecules to rotate at different angles to implement different image displays, the images are displayed in units of frames, and consecutive frames of images can form a video image, where the output manner of the signals for implementing the image display of each frame is substantially the same. In step S1, the current frame is defined as an image frame not yet displayed that is closest in time to a certain point in time.
Referring to fig. 2, in the present embodiment, the touch display method further includes:
step S4, determining whether there is overlap between the active time periods of the original touch scanning signal and the original display scanning signal of the current frame;
in step S5, if it is determined not to be the same, a touch operation is performed according to the original touch scan signal and a display operation is performed according to the original display scan signal.
If yes, the process goes to step S2.
The thin film transistor can drive the liquid crystal molecules to rotate by a corresponding angle according to the original display scanning signal so as to realize image display. In this embodiment, the state where the output of the display scan signal is high is defined as the valid state, the state where the original touch scan signal is at the high level is defined as the valid state, and if the period of time when the original touch scan signal of the current frame and the period of time when the original display scan signal are in the valid state overlap, the touch accuracy is affected by the gate scan signal. Then, it is determined whether there is an overlap between the active time periods of the current frame original touch scan signal and the original display scan signal in step S4, and if not, step S5 is executed to execute a touch operation according to the original touch scan signal and a display operation according to the original display scan signal.
If so, step S2 is executed to modulate the frequency and pulse width of the original display scan signal to generate a target display scan signal, so that the target display scan signal and the original touch scan signal are not in an active state at the same time, thereby avoiding the touch accuracy from being affected by the gate scan signal.
Referring to fig. 3, step S2 specifically includes:
step S21, respectively obtaining the frequency and pulse width of the original touch scanning signal and the original display scanning signal of the current frame;
step S22, modulating the frequency and the pulse width of the original display scan signal according to the frequency and the pulse width of the original touch scan signal and the original display scan signal of the current frame to generate a target display scan signal, where the target display scan signal and the original touch scan signal are not in an effective state at the same time.
Referring to fig. 4, step S21 specifically includes:
step S211 of differentiating the original touch scan signal and the original display scan signal of the current frame to generate a first spike signal corresponding to the original touch scan signal and a second spike signal corresponding to the original display scan signal;
in step S212, the first spike pulse signal and the second spike pulse signal are used to perform edge triggering and counting, so as to obtain the frequency and pulse width of the original touch scan signal and the original display scan signal of the current frame.
Referring to FIG. 5, FIG. 5 shows only the output waveforms of signals within one frame of image, including the original display scan signal H-Sync, the original touch scan signal Vsense, and the vertical synchronization signal V-Sync. In the nth image frame, the output of the vertical synchronization signal V-Sync is high level, the output of the original display scanning signal H-Sync is continuously high, the liquid crystal display displays the nth image frame, during which the original touch scanning signal Vsense is in a high level period in periods i and ii, and at this time, the original touch scanning signal Vsense and the original display scanning signal H-Sync are simultaneously in a high level, i.e., simultaneously in an active state, and the original display scanning signal needs to be modulated.
Referring to fig. 6, two differentiating circuits 30 shown in fig. 6 are respectively used to differentiate the original touch scan signal Vsense and the original display scan signal H-Sync, and the original touch scan signal Vsense is differentiated to generate the first spike signal V corresponding to the original touch scan signal Vsense shown in fig. 71sense, first spike signal V1Each pulse of sense is equal to a level transition time (including a rising edge and a falling edge) of the original touch scan signal VsenseOne is corresponded. Differentiating the original display scan signal H-Sync to generate the second spike signal H corresponding to the original display scan signal H-Sync as shown in FIG. 71Sync, second spike signal H1Each pulse of Sync corresponds one-to-one to the rising edge of the original display scan signal H-Sync.
Referring to both FIG. 6 and FIG. 7, the first spike signal V is used1sense and second spike signal H1Sync edge-triggers flip-flops 40, in this embodiment edge-triggered convention jumps low to high, i.e., flip-flops 40 will only output signals at the instant the low level jumps high.
After triggering, the counter structure shown in FIG. 8 is used to count the first spike pulse signal V1sense and second spike signal H1The pulses of the Sync are counted, the pulse interval, i.e. the period, is calculated, and the frequency is calculated in periods. The pulse width of the original display scanning signal H-Sync can be calculated by connecting the trigger which changes the conventional jump of the counter into the jump from high level to low level.
Referring to fig. 9, according to the frequency and pulse width of the original touch scan signal Vsense and the original display scan signal H-Sync, the period of time that the original display scan signal H-Sync is in the valid state is divided into three discontinuous sub-valid periods 3a, 3b, 3c to generate the target display scan signal H2Sync, making the time period I of the original touch scan signal Vsense in the active state correspond to the target display scan signal H in the current frame2Interval periods of sub-active periods 3a and 3b of Sync, a period ii in the active state corresponding to the target display scan signal H2Interval periods of sub-validity periods 3b and 3c of Sync. That is, the time interval of the active state of the original touch scanning signal corresponds to the time interval of each sub-active time interval of the target display scanning signal. In the current frame, the pulse width of the original touch scan signal Vsense is smaller than the length of the interval period, that is, the duration of the period i is smaller than the interval period corresponding to the period i, and the duration of the period ii is smaller than the interval period corresponding to the period ii. The target display scan signal H2Sync and raw touchThe scan signal Vsense is not active at the same time.
In other embodiments, other circuit structures may be used to implement the same method steps as the circuit structures shown in fig. 6 and 8.
According to the touch display method provided by the embodiment of the invention, the frequency and the pulse width of the original display scanning signal are modulated according to the original touch scanning signal and the original display scanning signal so as to generate the target display scanning signal, so that the target display scanning signal and the original touch scanning signal are not in an effective state at the same time, the interference of the grid scanning signal on touch is avoided, and the touch precision is favorably improved.
Referring to fig. 10, the touch display control circuit 10 provided in the present embodiment includes:
the signal acquisition module 11 is configured to acquire an original touch scanning signal and an original display scanning signal of a current frame;
the signal modulation module 12 is configured to modulate the frequency and the pulse width of the original display scanning signal to generate a target display scanning signal, where the target display scanning signal and the original touch scanning signal are not in an effective state at the same time; and
and a touch display control module 13, configured to perform a touch operation according to the original touch scan signal and perform a display operation according to the target display scan signal.
The touch display control circuit 10 provided in this embodiment can implement all the above method steps, and can implement all the above beneficial effects.
In this embodiment, the touch display control circuit 10 is a touch display control chip;
in one embodiment, the touch display control circuit 10 is used as a functional module of the touch display control chip;
in one embodiment, the touch display control circuit 10 is embedded in a touch display device, and the signal acquisition module 11, the signal modulation module 12, and the touch display control module 13 are all disposed on a main board of the touch display device;
in another embodiment, one of the signal acquiring module 11, the signal modulating module 12, and the touch display control module 13 is disposed on the main board, and the other part is used as a functional module of the touch display control chip.
The setting manner of the touch display control circuit 10 provided in this embodiment includes, but is not limited to, the above listed several, and this embodiment does not limit this.
Referring to fig. 11, the touch display device 20 provided in the present embodiment includes a processor 21 and a memory 22, where the memory 22 stores a computer program, and the computer program can implement the method steps described in any of the above when being executed by the processor 21. The touch display device 20 provided in the present embodiment can achieve all the above beneficial effects.
It will be appreciated by those skilled in the art that the above embodiments are illustrative only and not intended to be limiting, and that suitable modifications and variations may be made to the above embodiments without departing from the true spirit and scope of the invention.
Claims (9)
1. A touch display method is applied to a touch display device and is characterized by comprising the following steps:
step S1, acquiring an original touch scanning signal and an original display scanning signal of a current frame;
step S2, dividing the period of the original display scan signal in the active state of the current frame into a plurality of discontinuous sub-active periods to generate a target display scan signal, where the period of the original touch scan signal in the active state corresponds to the interval period of each sub-active period of the target display scan signal;
step S3, performing a touch operation according to the original touch scan signal and performing a display operation according to the target display scan signal;
step S2 is preceded by:
step S4, determining whether there is an overlap between the active time periods of the original touch scanning signal and the original display scanning signal of the current frame;
step S5, if not, executing touch operation according to the original touch scanning signal and executing display operation according to the original display scanning signal;
if yes, the process goes to step S2.
2. The touch display method of claim 1, wherein the step S2 specifically includes:
step S21, respectively obtaining the frequency and pulse width of the original touch scanning signal and the original display scanning signal of the current frame;
step S22, modulating the frequency and the pulse width of the original display scan signal according to the frequency and the pulse width of the original touch scan signal and the original display scan signal of the current frame to generate a target display scan signal, where the target display scan signal and the original touch scan signal are not in an active state at the same time.
3. The touch display method of claim 2, wherein the step S21 specifically includes:
step S211 of differentiating the original touch scan signal and the original display scan signal of the current frame to generate a first spike signal corresponding to the original touch scan signal and a second spike signal corresponding to the original display scan signal;
step S212, performing edge triggering and counting respectively with the first spike pulse signal and the second spike pulse signal to obtain the frequency and pulse width of the original touch scan signal and the original display scan signal of the current frame.
4. The touch display method of claim 3, wherein a period of time during which the original touch scan signal is in an active state corresponds to an interval period of each of the sub-active periods of the target display scan signal.
5. The touch display method of claim 4, wherein a pulse width of the original touch scan signal in the current frame is less than each of the interval period lengths.
6. The touch display method of claim 4, wherein the edge-triggered appointment transitions from low to high.
7. The touch display method of claim 4, wherein the active state is a high state.
8. A touch display control circuit, comprising:
the signal acquisition module is used for acquiring an original touch scanning signal and an original display scanning signal of a current frame and judging whether the periods of the current frame, in which the original touch scanning signal and the original display scanning signal are in an effective state, are overlapped;
the signal modulation module is used for modulating the frequency and the pulse width of the original display scanning signal to generate a target display scanning signal when the signal acquisition module judges that the periods of the original touch scanning signal and the original display scanning signal of the current frame in the effective state are overlapped, and the target display scanning signal and the original touch scanning signal are not in the effective state at the same time; and
the touch display control module is used for executing touch operation according to the original touch scanning signal and executing display operation according to the target display scanning signal when the signal acquisition module judges that the time intervals of the original touch scanning signal and the original display scanning signal of the current frame in the effective state are overlapped; the touch display control module is further configured to execute a touch operation according to the original touch scanning signal and execute a display operation according to the original display scanning signal when the signal acquisition module determines that the periods when the original touch scanning signal of the current frame and the original display scanning signal are in the valid state are not overlapped.
9. Touch display device comprising a processor and a memory, the memory storing a computer program, wherein the computer program, when executed by the processor, is adapted to carry out the method steps of any of claims 1 to 7.
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| CN201910150728.5A CN109885204B (en) | 2019-02-28 | 2019-02-28 | Touch display method, touch display control circuit and touch display device |
| TW108108321A TWI721387B (en) | 2019-02-28 | 2019-03-12 | Touch display method, touch display control circuit and touch display device |
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| CN201910150728.5A CN109885204B (en) | 2019-02-28 | 2019-02-28 | Touch display method, touch display control circuit and touch display device |
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| CN109885204B true CN109885204B (en) | 2022-04-12 |
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| CN103207720B (en) * | 2013-03-29 | 2015-09-16 | 北京京东方光电科技有限公司 | A kind of control method of touch-control display panel and device and display device |
| JP2015079173A (en) * | 2013-10-18 | 2015-04-23 | セイコーエプソン株式会社 | Electro-optical device, driving method of the same, and electronic apparatus |
| CN104461138B (en) * | 2014-12-05 | 2017-07-04 | 京东方科技集团股份有限公司 | The driving method of touch-control display panel, device and touch-control display panel |
| WO2018058663A1 (en) * | 2016-09-30 | 2018-04-05 | 深圳深微创芯科技有限公司 | Touch display unit and electronic device |
| KR102627056B1 (en) * | 2016-10-13 | 2024-01-22 | 엘지디스플레이 주식회사 | Touch display device, touch driving circuit and method for driving thereof |
| CN106598334B (en) * | 2016-12-15 | 2020-05-15 | 厦门天马微电子有限公司 | Touch display device and driving method thereof |
| CN108415606B (en) * | 2018-03-26 | 2021-01-12 | 京东方科技集团股份有限公司 | Display touch scanning method, chip, storage medium and display device |
| CN108664163A (en) * | 2018-04-26 | 2018-10-16 | 北京集创北方科技股份有限公司 | Control method and touch display system |
| TWI678654B (en) * | 2018-11-14 | 2019-12-01 | 友達光電股份有限公司 | Touch display device and touch driving method |
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| TW201504905A (en) * | 2013-07-22 | 2015-02-01 | Chunghwa Picture Tubes Ltd | Method of driving touch display and touch display capable of increasing signal-to-noise ratio |
| CN105824449A (en) * | 2015-01-09 | 2016-08-03 | 南京瀚宇彩欣科技有限责任公司 | Touch display device and driving method thereof |
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| TWI721387B (en) | 2021-03-11 |
| CN109885204A (en) | 2019-06-14 |
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