TWI692045B - Touch detection mode switching method, touch display driving integrated chip and information processing device - Google Patents

Abstract

A touch detection mode switching method includes: storing a plurality of circuit parameters in a touch driving circuit; selecting one of the plurality of circuit parameters according to control of a first selection signal to provide a first touch scanning parameter And store the first touch scan parameter in a first register, and select one of the plurality of circuit parameters according to the control of a second selection signal to provide a second touch scan parameter, and store the The second touch scan parameters are stored in a second register; and when switching from one touch detection mode to another touch detection mode, a touch scan unit performs a touch scan according to a current touch scan parameter The operation is switched to perform another touch scan operation according to the next touch scan parameter, wherein the current touch scan parameter is the first touch scan parameter and the next touch scan parameter is the second touch scan parameter Or the current touch scan parameter is the second touch scan parameter and the next touch scan parameter is the first touch scan parameter.

Description

Touch detection mode switching method, touch display driving integrated chip and information processing device

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

The touch screen has been widely used in various electronic devices. Generally, the touch screen includes a display panel and a touch panel, and the two are respectively controlled by a display driving chip and a touch driving chip. In recent years, with the maturity of in-cell touch screen technology, control design solutions for display panels and touch panels have also been directed towards integrating the display drive circuit with the touch drive circuit in a single chip, ie, touch display drive Integrated chip.

In order to ensure that there is no leakage detection in touch detection, the touch display driver integrated chip generally allows a fixed ratio between the detection frame rate of the touch scan signal and the display frame rate of the display drive signal, for example, at 120 Hz The detected 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 in a conventional touch display driving 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 approximately 16.67 ms, and two touch detection operations are performed during this period.

In addition, 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 scanning signal. Generally speaking, different touch detection modes require different circuit parameters, such as bias current, reference voltage, resistance, capacitance, circuit startup time, etc. When working with a touch display driver integrated chip, the following three 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 touch detection.

FIG. 2 illustrates an operation schematic diagram of a conventional touch display driver integrated chip touch detection mode switching. As shown in FIG. 2, a software that switches circuit parameters just encounters a pulse of the vertical synchronization signal (VSYNC) during the software operation. During this software operation, a touch detection unit ignores the effect of 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 to restart the touch detection operation. Therefore, if a touch detection cycle in the touch detection operation is 8.33 ms, it may take up to 25 ms (=16.67 ms+8.33 ms) for a touch point to be detected. However, if the duration of a touch operation is less than 25 ms, the touch operation will be missed.

As can be seen from the above description, a novel touch detection mode switching method is urgently needed in the art.

The main object of the present invention is to provide a touch detection mode switching method, which can greatly shorten the waiting time for re-synchronization of the touch detection and the synchronization signal (VSYNC) to restart, so as to avoid leakage detection of the touch operation.

To achieve the above objective, a touch detection mode switching method is proposed, which includes the following steps:

Store multiple circuit parameters in a touch drive circuit;

According to the control of a first selection signal, one of the plurality of circuit parameters is selected to provide a first touch scanning parameter, and the first touch scanning parameter is stored in a first register, and according to a second The control of the selection signal selects one of the plurality of circuit parameters to provide a second touch scan parameter, and stores the second touch scan parameter in a second register; and

When switching from one touch detection mode to another touch detection mode, a touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another touch according to the next touch scanning parameter Scanning operation, wherein the current touch scanning parameter is the first touch scanning parameter and the next touch scanning parameter is the second touch scanning parameter, or the current touch scanning parameter is the second touch scanning parameter Parameter and the next touch scan parameter is the first touch scan parameter.

In an embodiment, the plurality of circuit parameters are stored in a storage unit.

In one embodiment, the touch driving circuit is integrated with a display driving circuit in a single touch display driving integrated chip.

To achieve the above objective, the present invention provides a touch display driving integrated chip, which has a storage unit, a first multiplexer, a second multiplexer, a first register, a second register and a touch scan The unit performs a touch detection mode switching method. The method includes the following steps:

Store a plurality of circuit parameters in the storage unit;

Use the first multiplexer to select one of the plurality of circuit parameters according to the control of a first selection signal to provide a first touch scan parameter, and store the first touch scan parameter to the first In the register, and using the second multiplexer to select one of the plurality of circuit parameters according to the control of a second selection signal to provide a second touch scan parameter, and store the second touch scan parameter To the second register; and

When switching from one touch detection mode to another touch detection mode, the touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another touch according to the next touch scanning parameter Scanning operation, wherein the current touch scanning parameter is the first touch scanning parameter and the next touch scanning parameter is the second touch scanning parameter, or the current touch scanning parameter is the second touch scanning parameter Parameter and the next touch scan parameter is the first touch scan parameter.

In one embodiment, the integrated touch display driving chip further has a control unit to generate the first selection signal and the second selection signal.

In order to achieve the above object, the present invention further provides an information processing device, which has a central processing unit and a touch display device, the touch display device has a touch display driving integrated chip as described above, and the central processing unit is used In order to communicate with the touch display driver integrated chip.

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

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

In order to enable your review committee to further understand the structure, features, purposes, and advantages of the present invention, the drawings and detailed description of the preferred specific embodiments are attached as follows.

The invention provides a touch detection mode switching method, which is applied to an information processing device adopting a touch display driving integrated chip to avoid leakage detection of touch operation during the switching of the touch detection mode Phenomenon, 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 integrated computer, a fingerprint-type punching device, or an access control device.

Please refer to FIG. 3, which illustrates a circuit block diagram of an embodiment of a touch detection mode switching unit for implementing a touch detection mode switching method of the present invention. As shown in FIG. 3, a touch detection mode switching unit 1 is provided in a touch display driving integrated chip, and it includes: a storage unit 11, a first multiplexer 12, and a second multiplexer 13 , A first register 14, a second register 15, and a touch scanning unit 16, wherein the storage unit 11 stores a plurality of circuit parameters, including: the first circuit parameter 111, the second circuit parameter 112, ‧‧ ‧, and the Nth circuit parameter 11N; the first multiplexer 12 is used to select one of the plurality of circuit parameters to provide a first touch scan parameter according to the control of a first selection signal SEL1; the second The multiplexer 13 is used to select one of the plurality of circuit parameters to provide a second touch scan parameter according to the control of a second selection signal SEL2; the first register 14 is used to store the first touch Scanning parameters; the second register 15 is used to store the second touch scanning parameters; and the touch scanning unit 16 uses one of the first touch scanning parameters and the second touch scanning parameters as The current touch scan parameters of the touch detection mode and the remaining one is used as the touch scan parameters of the next touch detection mode. That is, if the touch scanning unit 16 performs a touch scanning operation with the first touch scanning parameter stored in the first register 14 in the current touch detection mode, when the touch scanning unit 16 changes In the touch detection mode, it will use the second touch scan parameter stored in the second register 15 to perform another touch scan operation; or, if the touch scan unit 16 is in the current touch detection mode Perform a touch scan operation with the second touch scan parameters stored in the second register 15, when the touch scan unit 16 changes the touch detection mode, it will change to the one stored in the first register 14 The first touch scan parameter performs another touch scan operation.

Based on FIG. 3, the touch detection mode switching method of the present invention will be described below. 4 is a flowchart of an embodiment of a method for switching a touch detection mode according to the present invention. As shown in FIG. 4, the touch detection mode switching method includes: storing a plurality of circuit parameters in a touch driving circuit (step S1); selecting one of the plurality of circuit parameters according to the control of a first selection signal To provide a first touch scan parameter, store the first touch scan parameter in a first register, and select one of the plurality of circuit parameters according to the control of a second selection signal to provide a first Two touch scan parameters, and store the second touch scan parameters in a second register (step S2); and when switching from one touch detection mode to another touch detection mode, a touch scanning unit Switch from performing a touch scan operation according to a current touch scan parameter to performing another touch scan operation according to a next touch scan parameter, wherein the current touch scan parameter is the first touch scan parameter and the next One touch scan parameter is the second touch scan parameter, or the current touch scan parameter is the second touch scan parameter and the next touch scan parameter is the first touch scan parameter (step S3).

That is, in step S1, the touch display driving integrated chip 1 stores a plurality of circuit parameters (111, 112, ‧‧‧, 11N) in the storage unit 11 In particular, when the firmware (driver) download program is executed on the touch drive circuit, the plurality of circuit parameters (111, 112, ‧‧‧, 11N) can be loaded into the storage unit 11 together.

In step S2, the touch display driving integrated chip 1 uses the first multiplexer 12 and the second multiplexer 13 to write the first touch scan parameters and the first touch scan parameters correspondingly into the first A register 14 and a second register 15.

In step S3, the touch display driving integrated chip 1 utilizes the touch scanning unit 16 to perform various types of touch detection operations. For example, assuming that the touch scanning unit 16 is currently performing a touch scanning operation by the first touch scanning parameter of the first register 14, and the touch scanning unit 16 must change its touch scanning mode at a later point, then The touch scanning unit 16 will perform another touch scanning operation according to the second touch scanning parameter of the second register 15; or, it is assumed that the touch scanning unit 16 is currently based on the second touch scanning of the second register 15 Parameters to perform a touch scan operation, and at a later point in time, the touch scan unit 16 must change its touch scan mode, then the touch scan unit 16 will change to the first touch scan parameter of the first register 14 to perform another One touch scanning operation. In a possible embodiment, a control unit inside the touch driving circuit may send the first selection signal SEL1 and the second selection signal SEL2 to perform the first touch scanning parameter and the second touch scanning parameter Update.

As can be seen from the above description, the touch detection mode switching method of the present invention does not need to stop touch detection in advance each time the touch detection mode is switched, so the wait for resynchronization of touch detection and synchronization signal (VSYNC) can be effectively shortened Time, and in the worst case, the waiting time is only 16.7ms.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 5, which illustrates 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 device for driving the touch display panel 121 A touch display driving integrated chip 122 is used to execute the touch detection mode switching method of FIG. 4, and the central processing unit 110 is used to communicate with the touch display driving integrated chip 122.

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

As such, the above is a complete and clear description of a touch detection method of the present invention; and, through the above, it can be known that the present invention has the following advantages:

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

It must be emphasized that the aforementioned disclosure in this case is a preferred embodiment, and any part of the modification or modification that originates from the technical idea of this case and is easily inferred by those who are familiar with the art, does not deviate from the patent of this case. Power category.

In summary, regardless of the purpose, means and effects of this case, it shows that it is very different from the conventional technology, and its first invention is practical and practical, and it does meet the patent requirements of the invention. I urge your review committee to investigate and give the patent to the AirPlus as soon as possible. Society is for supreme prayer.

<The present invention> 1: Touch detection mode switching unit 11: Storage unit 12: The first multiplexer 13: Second multiplexer 14: first register 15: second register 16: Touch scanning unit 111: The first circuit parameter group 112: The second circuit parameter group 11N: Nth circuit parameter group Step S1: Store a plurality of circuit parameters in a touch drive circuit Step S2: Select one of the plurality of circuit parameters according to the control of a first selection signal to provide a first touch scan parameter, and store the first touch scan parameter in a first register, and The control of a second selection signal selects one of the plurality of circuit parameters to provide a second touch scan parameter, and stores the second touch scan parameter in a second register Step S3: When switching from one touch detection mode to another touch detection mode, a touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another one according to the next touch scanning parameter A touch scan operation, wherein the current touch scan parameter is the first touch scan parameter and the next touch scan parameter is the second touch scan parameter, or the current touch scan parameter is the second Touch scan parameter and the next touch scan parameter is the first touch scan parameter

<Xizhi>

1 shows a waveform diagram of a synchronization signal generated by a synchronization signal generating unit in a conventional touch display driving integrated chip; FIG. 2 is a schematic diagram illustrating the operation of switching the touch detection mode of a conventional touch display driver integrated chip; 3 is a circuit block diagram of an embodiment of a touch detection mode switching unit for implementing a touch detection mode switching method of the present invention; 4 is a flowchart of an embodiment of a method for switching a touch detection mode according to the present invention; and 5 is a block diagram of an embodiment of the information processing device of the present invention.

Step S1: Store a plurality of circuit parameters in a touch drive circuit

Step S2: Select one of the plurality of circuit parameters according to the control of a first selection signal to provide a first touch scan parameter, and store the first touch scan parameter in a first register, and The control of a second selection signal selects one of the plurality of circuit parameters to provide a second touch scan parameter, and stores the second touch scan parameter in a second register

Step S3: When switching from one touch detection mode to another touch detection mode, a touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another one according to the next touch scanning parameter A touch scan operation, wherein the current touch scan parameter is the first touch scan parameter and the next touch scan parameter is the second touch scan parameter, or the current touch scan parameter is the second Touch scan parameter and the next touch scan parameter is the first touch scan parameter

Claims (8)

A touch detection mode switching method includes the following steps: Store multiple circuit parameters in a touch drive circuit; According to the control of a first selection signal, one of the plurality of circuit parameters is selected to provide a first touch scanning parameter, and the first touch scanning parameter is stored in a first register, and according to a second The control of the selection signal selects one of the plurality of circuit parameters to provide a second touch scan parameter, and stores the second touch scan parameter in a second register; and When switching from one touch detection mode to another touch detection mode, a touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another touch according to the next touch scanning parameter Scanning operation, wherein the current touch scanning parameter is the first touch scanning parameter and the next touch scanning parameter is the second touch scanning parameter, or the current touch scanning parameter is the second touch scanning parameter Parameter and the next touch scan parameter is the first touch scan parameter. The touch detection mode switching method as described in item 1 of the patent application range, wherein the plurality of circuit parameters are stored in a storage unit. The touch detection mode switching method as described in item 1 of the patent application scope, wherein the touch driving circuit is integrated with a display driving circuit in a single touch display driving integrated chip. A touch display driving integrated chip having a storage unit, a first multiplexer, a second multiplexer, a first register, a second register, and a touch scanning unit to execute a touch detection mode Switching method, the method includes the following steps: Store a plurality of circuit parameters in the storage unit; Use the first multiplexer to select one of the plurality of circuit parameters according to the control of a first selection signal to provide a first touch scan parameter, and store the first touch scan parameter to the first In the register, and using the second multiplexer to select one of the plurality of circuit parameters according to the control of a second selection signal to provide a second touch scan parameter, and store the second touch scan parameter To the second register; and When switching from one touch detection mode to another touch detection mode, the touch scanning unit switches from performing a touch scanning operation according to a current touch scanning parameter to executing another touch according to the next touch scanning parameter Scanning operation, wherein the current touch scanning parameter is the first touch scanning parameter and the next touch scanning parameter is the second touch scanning parameter, or the current touch scanning parameter is the second touch scanning parameter Parameter and the next touch scan parameter is the first touch scan parameter. The touch display driving integrated chip as described in item 4 of the patent application scope further has a control unit to generate the first selection signal and the second selection signal. An information processing device having a central processing unit and a touch display device, the touch display device having a touch display driving integrated chip as described in any one of patent application items 4 to 5, and The central processing unit is used to communicate with the touch display driver integrated chip. The information processing device as described in item 6 of the patent application scope, wherein the touch display device is a touch display selected by 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 as described in item 6 of the patent application scope is an electronic device selected from the group consisting of smart phones, tablet computers, notebook computers, all-in-one computers, smart watches and access control devices.

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