TWI721387B - Touch display method, touch display control circuit and touch display device - Google Patents

Abstract

The present disclosure provides a touch display method applied to a touch display device. The method includes the following steps: Step S1, acquiring an original touch scan signal and an original display scan signal of a current frame; step S2, dividing the period of the current frame in which the original display scan signal is in an effective state into a plurality of discontinuous sub-effective periods to generate a target display scan signal, the period in which the original touch scan signal is in an active state corresponds to each of the interval period of the sub-effective periods of the target display scan signal , step S3, performing touch operation according to the original touch scan signal, and performing display operation according to the target display scan signal. The touch display method provided by the embodiment of the disclosure can improve the touch accuracy. The embodiment of the disclosure further provides a touch display control circuit and a touch display device.

Description

Touch display method, touch display control circuit and touch display device

The present invention relates to the field of optoelectronic technology, in particular to a touch display method, a touch display control circuit and a touch display device.

Conventional smart devices are usually equipped with display functions and touch functions at the same time. One type of smart devices uses time-sharing display and touch methods, while the other type of smart devices can perform display functions and touch functions at the same time. Among them, taking a liquid crystal display device as an example, a thin film transistor disposed on a substrate uses the thin film transistor to drive the rotation of liquid crystal molecules to perform display.

The display signal includes the gate scanning signal and the display scanning signal. When the gate scanning signal output is high, it is used to control the conduction of the thin film transistor, the display scanning signal output is high, and the rotation angle of the liquid crystal molecules is controlled to realize the display of the corresponding screen. When the gate scanning signal output is low level, it is used to control the disconnection of the thin film transistor. When the display function and the touch function are executed at the same time, the gate scan signal, the display scan signal and the touch signal are respectively output at a predetermined frequency. At a certain moment, if the touch signal and the display scan signal output high level at the same time, the touch signal is subject to the gate scan signal (mainly the on state and off state of the thin film transistor are switched, corresponding to the gate scan signal at high level Jump between and low level, at this time, the pressure difference is large), which will cause the touch accuracy to be inaccurate.

One aspect of the present invention provides a touch display method, which is applied to a touch display device, and includes the following steps: Step S1, acquiring the original touch scan signal and the original display scan signal of the current frame; Step S2, dividing the period during which the original display scan signal of the current frame is in a valid state into a plurality of discontinuous sub-valid periods to generate the target display scan signal, the original touch scan The period during which the signal is in a valid state corresponds to the interval period of each of the sub-valid periods of the target display scan signal; Step S3: Perform a touch operation according to the original touch scan signal and perform 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 to acquire the original touch scan signal and the original display scan signal of the current frame; A signal modulation module for modulating the frequency and pulse width of the original display scanning signal to generate a target display scanning signal, the target display scanning signal and the original touch scanning signal are not in a valid state at the same time; and The touch display control module is used to perform a touch operation according to the original touch scan signal and perform a display operation according to the target display scan signal.

Another aspect of the present invention provides a touch display device including a processor and a memory, the memory stores a computer program, and the computer program, when executed by the processor, can implement the steps of the above touch display method .

The touch display method provided by the embodiment of the present invention modulates the frequency and pulse width of the original display scan signal according to the original touch scan signal and the original display scan signal to generate the target display scan signal, so that the target display scan signal is compared with the original display scan signal. The touch scan signal is not in a valid state at the same time, which prevents the gate scan signal from interfering with the touch, which is beneficial to improve the touch accuracy.

S1, S2, S3, S4, S5, S21, S22, S211, S212: steps

Vsense: Original touch scan signal

V ¹ sense: the first spike signal

H-Sync: Original display scan signal

H ¹ -Sync: second spike signal

H ² -Sync: target display scan signal

V-Sync: vertical sync signal

10: Touch display control circuit

I, II: time period

40: trigger

30: Differential circuit

3a, 3b, 3c: sub-valid period

11: Signal acquisition module

12: Signal Modulation Module

13: Touch display control module

20: Touch display device

21: processor

22: Memory

FIG. 1 is a schematic flow diagram of the steps of a touch display method provided by an embodiment of the present invention.

FIG. 2 is a schematic flowchart of another step of the touch display method according to an embodiment of the present invention.

Fig. 3 is a detailed flowchart of step S2 in Fig. 1.

FIG. 4 is a schematic diagram of the detailed flow of step S21 in FIG. 3.

Figure 5 shows the original signal output waveform in a frame of image.

FIG. 6 is a schematic diagram of the circuit structure of a differential circuit provided by an embodiment of the present invention.

Fig. 7 is a schematic diagram of the output waveform of the differential circuit in Fig. 6.

FIG. 8 is a schematic diagram of the circuit structure of a counter provided by an embodiment of the present invention.

FIG. 9 is a schematic diagram of the corresponding signal waveform in step S22.

FIG. 10 is a schematic diagram of a module structure of a touch display control circuit provided by an embodiment of the present invention.

FIG. 11 is a schematic diagram of a module structure of a touch display device provided by an embodiment of the present invention.

Please refer to FIG. 1, the touch display method provided by this embodiment includes: step S1, obtaining the original touch scan signal and the original display scan signal of the current frame; step S2, the original display scan signal of the current frame is in a valid state The period is divided into a plurality of discontinuous sub-effective periods to generate the target display scan signal. The period in which the original touch scan signal is in the effective state corresponds to the interval of each sub-effective period of the target display scan signal; step S3, according to the original touch scan The signal performs a touch operation and performs 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. The touch display device may be a liquid crystal display, a light emitting diode display, etc. In this embodiment, the touch display device is a liquid crystal display as an example for illustration. The liquid crystal display is equipped with touch function and display function at the same time. The liquid crystal display includes a plurality of touch driving electrodes for touch control, a liquid crystal layer, and driving components (generally thin film transistors) for controlling the rotation angle of the 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 realize the touch function, and the original display scan signal is used to output to the driving component according to the preset rule to control the rotation of the liquid crystal molecules. Different images can be displayed at different angles, and the images are displayed in units of frames. Continuous multiple frames can form video images. Among them, the signal output mode for realizing the display of each frame is roughly the same. In this embodiment, one frame is realized as follows: The process of screen display is explained as an example. Among them, in step S1, the current frame is defined as the undisplayed image frame closest to a certain time.

Referring to FIG. 2, in this embodiment, the touch display method further includes: step S4, determining whether the original touch scan signal in the current frame and the original display scan signal are in a valid state overlap; step S5, if it is determined to be No, the touch operation is performed based on the original touch scan signal and the display operation is performed based on the original display scan signal.

If the judgment is yes, then step S2 is executed.

The thin film transistor can drive the liquid crystal molecules to rotate the corresponding angle according to the original display scanning signal to realize image display. In this embodiment, the state where the output of the display scan signal is high is defined as its effective state, and the state where the original touch scan signal is at a high level is defined as its effective state. If the current frame of the original touch scan signal and the original display scan signal are valid When the time periods of the state overlap, the touch accuracy is affected by the gate scanning signal. Step S4 is used to determine whether the original touch scan signal of the current frame and the original display scan signal are in a valid state. Step S5 is executed when it is judged as no, and the touch operation is performed according to the original touch scan signal and the original display scan is performed. The signal performs the display operation.

When the judgment is yes, perform step S2 to modulate the frequency and pulse width of the original display scan signal to generate the target display scan signal, so that the target display scan signal and the original touch scan signal are not in a valid state at the same time, so as to prevent the touch accuracy from being affected. The influence of extremely scanning signal.

Please refer to FIG. 3, step S2 specifically includes: step S21, obtaining the frequency and pulse width of the original touch scan signal and the original display scan signal of the current frame respectively; step S22, according to the original touch scan signal and the original display scan of the current frame The frequency and pulse width of the signal modulate the frequency and pulse width of the original display scan signal to generate the target display scan signal. The target display scan signal is in a valid state when it is different from the original touch scan signal.

Please refer to FIG. 4, step S21 specifically includes: step S211, respectively differentiating the original touch scan signal and the original display scan signal of the current frame to generate the first spike signal corresponding to the original touch scan signal and the original display scan The second spike signal corresponding to the signal; step S212, edge triggering and counting are performed with the first spike signal and the second spike signal, respectively, to obtain the original touch scan signal of the current frame and the frequency and pulse of the original display scan signal width.

Please refer to FIG. 5. In FIG. 5, only the signal output waveform in one frame of image is shown, 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 vertical synchronization signal V-Sync output is high, and the original display scan signal H-Sync output continues to be high. The LCD display displays the Nth frame image. During this time period, the original touch scan signal Vsense is at a high level during periods I and II. At this time, it is at a high level at the same time as the original display scan signal H-Sync, that is, it is in a valid state at the same time, and the original display scan signal needs to be modulated.

Please refer to FIG. 6, the two differentiating circuits 30 shown in FIG. 6 are used to differentiate the original touch scan signal Vsense and the original display scan signal H-Sync respectively, and the original touch scan signal Vsense is differentiated to generate the picture ^{7 shows the first spike signal V 1} sense corresponding to the original touch scan signal Vsense, each pulse of the first spike signal V ¹ sense and the level transition time of the original touch scan signal Vsense (including rising (Edge and falling edge) one-to-one correspondence. Differentiate the original display scan signal H-Sync to generate the second spike signal H ¹ -Sync corresponding to the original display scan signal H-Sync as shown in Figure 7. Each of the second spike signals H ¹ -Sync The pulse corresponds to the rising edge of the original display scan signal H-Sync one by one.

6 and 7 at the same time, the first spike signal V ¹ sense and the second spike signal H ¹ -Sync are used to edge trigger the flip-flop 40. In this embodiment, the predetermined transition of the edge trigger is changed to low power. When the level transitions to a high level, the trigger 40 will have a signal output only when the low level transitions to a high level.

After triggering, the pulses of the first spike signal V ¹ sense and the second spike signal H ¹ -Sync are counted with the counter structure shown in FIG. 8, and the pulse interval is calculated. The pulse interval is also the period, and the frequency can be calculated by the period. The pulse width of the original display scan signal H-Sync can be calculated by changing the counter connection convention to a high level to low level trigger.

Please refer to Figure 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 during which the original display scan signal H-Sync is active is divided into three discontinuous sub-effective periods 3a, 3b and 3c generate the target display scan signal H ² -Sync, so that in the current frame, the period I during which the original touch scan signal Vsense is in a valid state corresponds to the interval between the sub-valid periods 3a and 3b of the ^{target display scan signal H 2 -Sync.} The period II in the effective state corresponds to the interval period between the sub-effective periods 3b and 3c of the ^{target display scan signal H 2 -Sync.} That is, the period during which the original touch scan signal is in the effective state corresponds to the interval period of each sub-effective period of the target display scan signal. In the current frame, the pulse width of the original touch scan signal Vsense is less than the interval period length, and the duration of the time period I is less than the corresponding interval period, and the duration of the period II is less than the corresponding interval period. Then the target display scan signal H ² -Sync and the original touch scan signal Vsense are not in a valid state at the same time.

In other embodiments, other circuit structures can be used to implement the same method steps as the circuit structures shown in FIGS. 6 and 8.

The touch display method provided by the embodiment of the present invention modulates the frequency and pulse width of the original display scan signal according to the original touch scan signal and the original display scan signal to generate the target display scan signal, so that the target display scan signal is compared with the original display scan signal. The touch scan signal is not in a valid state at the same time, which prevents the gate scan signal from interfering with the touch, which is beneficial to improve the touch accuracy.

10, the touch display control circuit 10 provided by this embodiment includes: a signal acquisition module 11 for acquiring the original touch scan signal and the original display scan signal of the current frame; a signal modulation module 12 for modulating the original Display the frequency and pulse width of the scanning signal to generate the target display scanning signal, the target display scanning signal and the original touch scanning signal are not in a valid state at the same time; and the touch display control module 13 is used to perform touch based on the original touch scanning signal Operate and perform display operations based on the target display scan signal.

The touch display control circuit 10 provided in this embodiment can implement all the method steps described above, and can achieve all the beneficial effects described above.

In this embodiment, the touch display control circuit 10 is a touch display control chip; in one embodiment, the touch display control circuit 10 serves as a functional module of the touch display control chip; in one embodiment, the touch The display control circuit 10 is built 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 arranged on the main board of the touch display device; in another embodiment, the signal acquisition module 11. One part of the signal modulation module 12 and the touch display control module 13 is arranged on the main board, and the other part is used as a functional module of the touch display control chip.

The configuration methods of the touch display control circuit 10 provided in this embodiment include but are not limited to the above-listed ones, which are not limited in this embodiment.

Please refer to FIG. 11, the touch display device 20 provided by this embodiment includes a processor 21 and a memory 22. The memory 22 stores a computer program. When the computer program is executed by the processor 21, any of the above can be implemented. The method steps described. The touch display device 20 provided in this embodiment can achieve all the beneficial effects described above.

Those of ordinary skill in the art should realize that the above embodiments are only used to illustrate the present invention, and not to limit the present invention. As long as they fall within the essential spirit of the present invention, the above embodiments are appropriately made. Changes and changes fall within the scope of protection of the present invention.

S1, S2, S3: steps

Claims (10)

A touch display method applied to a touch display device. The improvement is that it includes the following steps: Step S1: Obtain the original touch scan signal and the original display scan signal of the current frame; Step S2: The period in which the original display scan signal is in the effective state is divided into a plurality of discontinuous sub-effective periods to generate the target display scan signal, and the period in which the original touch scan signal is in the effective state corresponds to each of the sub-effective periods of the target display scan signal The interval period; Step S3, 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 method according to claim 1, wherein, before step S2, the method further includes: step S4, determining whether the time period during which the original touch scan signal of the current frame and the original display scan signal are in a valid state overlap Step S5, if the judgment is no, perform a touch operation according to the original touch scan signal and perform a display operation according to the original display scan signal; if the judgment is yes, perform the step S2. The touch display method according to claim 1, wherein the step S2 specifically includes: step S21, respectively obtaining the original touch scan signal and the frequency and pulse width of the original display scan signal of the current frame Step S22, modulate the frequency and pulse width of the original display scan signal according to the frequency and pulse width of the original touch scan signal and the original display scan signal of the current frame to generate the target display scan signal, The target display scan signal and the original touch scan signal are not in a valid state at the same time. The touch display method according to claim 3, wherein the step S21 specifically includes: step S211, respectively differentiating the original touch scan signal and the original display scan signal of the current frame to generate and 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 with the first spike signal and the second spike signal respectively to obtain the frequency and frequency of the original touch scan signal and the original display scan signal of the current frame Pulse Width. The touch display method according to claim 4, wherein the period during which the original touch scan signal is in a valid state corresponds to the interval period of each of the sub-valid periods of the target display scan signal in a one-to-one correspondence. The touch display method according to claim 5, wherein, in the current frame, the pulse width of the original touch scan signal is less than the length of each interval. The touch display method according to claim 5, wherein the predetermined transition of the edge trigger changes from a low level to a high level. The touch display method according to claim 5, wherein the effective state is a high level state. A touch display control circuit is improved in that it includes: a signal acquisition module for acquiring the original touch scan signal and the original display scan signal of the current frame; a signal modulation module for modulating the frequency of the original display scan signal and The pulse width is used to generate a target display scan signal, the target display scan signal and the original touch scan signal are not in a valid state at the same time; and a touch display control module for performing a touch operation according to the original touch scan signal And perform a display operation according to the target display scan signal. A touch display device includes a processor and a memory, and the memory stores a computer program. The improvement is that the computer program can be implemented as described in any one of claim items 1 to 8 when the computer program is executed by the processor. The method steps described.

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