TWI712931B - Touch detection method, touch display drive integrated chip and information processing device - Google Patents

Abstract

A touch detection method is implemented in a touch display device. The method includes the following steps: generating a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal is synchronized with a vertical synchronization signal, The vertical synchronization signal is used to start a frame of picture drawing and has a period T1. The second synchronization signal lags behind the first synchronization signal by a predetermined time t, T2<t<(T1-T2), T2 represents A touch scan period, and T1>2*T2>0; and a touch scan operation of a touch unit is enabled according to the first synchronization signal or the second synchronization signal, wherein the touch scan operation includes at least one The touch scan period.

Description

Touch detection method, touch display drive integrated chip and information processing device

The present invention relates to touch detection, in particular to a touch detection method of a touch display device.

Touch screens have been widely used in various electronic devices. Generally, a touch screen includes a display panel and a touch panel, and the two are controlled by a display driver chip and a touch driver chip, respectively. In recent years, with the maturity of in-cell touch screen technology, control design solutions for display panels and touch panels are also moving towards integrating the display drive circuit and the touch drive circuit into a single chip, that is, touch display drive Integrated chip.

In order to ensure that there is no missing detection in touch detection, the touch display driver integrated chip generally makes the detection frame rate of the touch scan signal and the display frame rate of the display drive signal have a fixed ratio, for example, at 120Hz The detection frame rate corresponds to the display frame rate of 60Hz.

FIG. 1 shows a waveform diagram of a synchronization signal generated by a synchronization signal generating unit inside a conventional touch display driver integrated chip. It is worth noting that the existing touch display driving integrated chip usually integrates a synchronization signal generating unit to generate a vertical synchronization signal (VSYNC) to drive a display driving module and a touch driving module. It can be seen from FIG. 1 that when the display frame rate is 60 Hz, the display time of each frame is about 16.67 ms, and during this period, two touch detection operations are performed.

In addition, the touch detection can be switched between multiple modes, for example: switching between a low-power detection mode and a normal detection mode; or changing the frequency of the touch scan signal. Generally speaking, the circuit parameters that need to be set for different touch detection modes are also different, such as: bias current, reference voltage, resistance, capacitance, circuit startup time, etc. When a touch display driving integrated chip is working, the following 3 operating procedures are usually used to complete the switching of the touch detection mode: 1. Stop the touch detection (that is, disable the touch detection operation); 2. Switch the circuit parameters ; And 3. Restart the touch detection.

FIG. 2 shows an operation schematic diagram of the touch detection mode switching of a conventional touch display driver integrated chip. As shown in Figure 2, a software operation for switching circuit parameters just encounters a pulse of the vertical synchronization signal (VSYNC). During this software operation, a touch detection unit ignores the pulse of the vertical synchronization signal. Stop the touch detection operation. After the software operation period has passed, the touch detection unit must wait until the next pulse of the vertical synchronization signal before restarting the touch detection operation. Therefore, if a touch detection cycle in the touch detection operation is 8.33ms, it may take up to 25ms (=16.67ms+8.33ms) for a touch point to be detected. However, if the duration of a touch operation is less than 25ms, the touch operation will be missed.

It can be seen from the above description that there is an urgent need for a novel touch detection method in the art.

The main purpose of the present invention is to provide a touch detection method, which can avoid the phenomenon of missing touch operation detection during the switching process of the touch detection mode.

To achieve the above objective, a touch detection method is proposed, which is implemented in a touch display device. The method includes the following steps: generating a second synchronization signal according to a first synchronization signal, wherein the first synchronization The signal is synchronized with a vertical synchronization signal. The vertical synchronization signal is used to start a frame of picture drawing and has a period T1. The second synchronization signal lags the first synchronization signal by a predetermined time t, T2<t <(T1-T2), T2 represents a touch scan period, and T1>2*T2>0; and a touch scan operation of a touch unit is enabled according to the first synchronization signal or the second synchronization signal, The touch scan operation includes at least one touch scan period.

In one embodiment, the touch unit has a touch mode switching function, and when the touch unit executes the touch mode switching function, the touch scan operation is disabled.

In an embodiment, the first synchronization signal and the second synchronization signal are generated by a timing control unit.

In one embodiment, the touch unit and a display drive unit are integrated in a touch display drive integrated chip.

To achieve the above objective, the present invention further provides a touch display driving integrated chip to perform a touch detection method. The method includes the following steps: generating a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal It is synchronized with a vertical synchronization signal. The vertical synchronization signal is used to start a frame of picture drawing and has a period T1. The second synchronization signal lags behind the first synchronization signal by a predetermined time t, T2<t< (T1-T2), T2 represents a touch scan period, and T1>2*T2>0; and a touch scan operation of a touch unit is enabled according to the first synchronization signal or the second synchronization signal, where The touch scan operation includes at least one of the touch scan periods.

In one embodiment, the touch unit has a touch mode switching function, and when the touch unit executes the touch mode switching function, the touch scan operation is disabled.

In an embodiment, the first synchronization signal and the second synchronization signal are generated by a timing control unit.

To achieve the above objective, the present invention further provides an information processing device having a central processing unit and a touch display device. The touch display device has the aforementioned touch display drive integrated chip, and the central processing unit is used To communicate with the integrated chip of the touch display driver.

In possible embodiments, the touch display device may be a liquid crystal touch display device, an LED touch display device or an OLED touch display device.

In possible embodiments, the information processing device may be a smart phone, a tablet computer, a notebook computer, an all-in-one computer, a smart watch, or an access control device.

To enable your reviewer to further understand the structure, features, purpose, and relationship of the present invention The advantages are attached with drawings and detailed descriptions of preferred embodiments are as follows.

The present invention mainly proposes a touch detection method, which is applied to an information processing device using a touch display drive integrated chip, so as to avoid the phenomenon of missing touch operation detection during the switching process of the touch detection mode , Wherein, the information processing device may be, but not limited to, an electronic device such as a smart phone, a tablet computer, a notebook computer, an all-in-one computer, a fingerprint punching device or an access control device.

Please refer to FIG. 3, which shows a flowchart of an embodiment of the touch detection method of the present invention. The method is implemented in a touch display device and includes the following steps: generating a first synchronization signal according to a first synchronization signal. Two synchronization signals, where the first synchronization signal is synchronized with a vertical synchronization signal, the vertical synchronization signal is used to start a frame of picture drawing operation and has a period T1, and the second synchronization signal lags behind the first The synchronization signal is a predetermined time t, T2<t<(T1-T2), T2 represents a touch scan period, and T1>2*T2>0 (step a); and according to the first synchronization signal or the second synchronization The signal enables a touch scan operation of a touch unit, wherein the touch scan operation includes at least one touch scan period (step b).

In step a, the first synchronization signal and the second synchronization signal are generated by a timing control unit.

In step b, the touch unit has a touch mode switching function, and when the touch unit executes the touch mode switching function, the touch scan operation is disabled. In addition, the touch unit is integrated with a display drive unit in a touch display drive integrated chip.

Please refer to FIG. 4, which shows a working sequence diagram generated by the touch detection method of FIG. 3. As shown in FIG. 4, the first synchronization signal has a period T1 (=16.67 ms), the second synchronization signal lags the first synchronization signal by a predetermined time t, T2<t<(T1-T2), and T2 represents a period Touch scan cycle, and T1>2*T2>0. According to this design, even if it coincides with a pulse of the first synchronization signal during the switching period of the touch detection mode, since a pulse of the second synchronization signal can appear in time before the next pulse of the first synchronization signal. The touch scanning operation is started, so the touch unit can effectively avoid the occurrence of touch operation miss detection.

Based on the above description, the present invention further provides an information processing device. Please refer to the picture 5. It shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 5, an information processing device 100 includes a central processing unit 110 and a touch display device 120, wherein the touch display device 120 has a touch display panel 121 and a drive for driving the touch display panel 121 A touch display drive integrated chip 122, the touch display drive integrated chip 122 is used to execute the touch detection method of FIG. 3, and the central processing unit 110 is used to communicate with the touch display drive integrated chip 122.

In addition, the touch display device 120 may be a liquid crystal touch display device, an LED (light emitting diode) touch display device, or an OLED (organic light emitting diode) touch display device.

In this way, the above system has completely and clearly described a touch detection method of the present invention; and from the above, it can be known that the present invention has the following advantages:

The touch detection method of the present invention can avoid the missed detection of touch operation during the switching process of the touch detection mode.

It must be emphasized that the foregoing disclosures in this case are preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of this case and are easily inferred by those who are familiar with the art will not deviate from the patent of this case. Right category.

To sum up, regardless of the purpose, means and effect of this case, it is shown that it is very different from the conventional technology, and its first invention is suitable for practicality, and it does meet the patent requirements of the invention. I sincerely ask your examiner to investigate and grant the patent as soon as possible To benefit society is to pray for the most.

<The present invention>

100: Information processing device

110: Central Processing Unit

120: Touch display device

121: Touch display panel

122: Touch display driver integrated chip

Step a: Generate a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal is synchronized with a vertical synchronization signal, and the vertical synchronization signal is used to initiate a frame image drawing operation and has a Period T1, the second synchronization signal lags behind the first synchronization signal by a predetermined time t, T2<t<(T1-T2), T2 represents a touch scan period

Step b: enabling a touch scan operation of a touch unit according to the first synchronization signal or the second synchronization signal, wherein the touch scan operation includes at least one of the touch scan periods

<Learning>

no

Fig. 1 shows a waveform diagram of a synchronous signal generated by a synchronous signal generating unit inside a conventional touch display drive integrated chip; Fig. 2 shows an operation schematic diagram of touch detection mode switching of a conventional touch display drive integrated chip Figure 3 shows a flow chart of an embodiment of the touch detection method of the present invention; Figure 4 shows a working sequence diagram generated by the touch detection method of Figure 3; and Figure 5 shows the information processing device of the present invention A block diagram of an embodiment.

Step a: Generate a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal is synchronized with a vertical synchronization signal, and the vertical synchronization signal is used to initiate a frame image drawing operation and has a Period T1, the second synchronization signal lags behind the first synchronization signal by a predetermined time t, T2<t<(T1-T2), T2 represents a touch scan period

Step b: enabling a touch scan operation of a touch unit according to the first synchronization signal or the second synchronization signal, wherein the touch scan operation includes at least one of the touch scan periods

Claims (8)

A touch detection method is implemented in a touch display device. The method includes the following steps: generating a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal is synchronized with a vertical synchronization signal, The vertical synchronization signal is used to start a frame of picture drawing and has a period T1. The second synchronization signal lags behind the first synchronization signal by a predetermined time t, T2<t<(T1-T2), T2 represents A touch scan period, and T1>2*T2>0; and a touch scan operation of a touch unit is enabled according to the first synchronization signal or the second synchronization signal, wherein the touch scan operation includes at least one The touch scan period; wherein, the touch unit has a touch mode switching function, and when the touch unit performs the touch mode switching function, the touch scan operation will be disabled. According to the touch detection method described in claim 1, wherein the first synchronization signal and the second synchronization signal are generated by a timing control unit. According to the touch detection method described in claim 1, wherein the touch unit and a display drive unit are integrated in a touch display drive integrated chip. A touch display drive integrated chip for performing a touch detection method. The method includes the following steps: generating a second synchronization signal according to a first synchronization signal, wherein the first synchronization signal is synchronized with a vertical synchronization signal , The vertical synchronization signal is used to start a frame of picture drawing operation and has a period T1, the second synchronization signal is behind the first synchronization signal by a predetermined time t, T2<t<(T1-T2), T2 Represents a touch scan period, and T1>2*T2>0; and according to the first synchronization signal or the second synchronization signal, a touch scan operation of a touch unit is enabled, wherein the touch scan operation includes at least A touch scan period; wherein, the touch unit has a touch mode switching function, and when the touch unit performs the touch mode switching function, the touch scan operation is disabled. According to the touch-sensitive display driver integrated chip described in claim 4, the first synchronization signal and the second synchronization signal are generated by a timing control unit. An information processing device having a central processing unit and a touch display device, the touch display device having the touch display drive integrated chip as described in any one of items 4 to 5 of the scope of patent application, and The central processing unit is used to communicate with the touch display driver integrated chip. The information processing device described in item 8 of the scope of patent application, wherein the touch display device is a touch display selected from the group consisting of a liquid crystal touch display device, an LED touch display device, and an OLED touch display device Device. The information processing device described in item 6 of the scope of patent application is an electronic device selected by the group consisting of smart phones, tablet computers, notebook computers, all-in-one computers, smart watches, and access control devices.

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