TWI707263B - Touch display driving circuit, touch display device and information processing device with variable frame rate and fixed touch scanning frequency - Google Patents

Abstract

A touch display drive circuit, characterized in that: during operation, a touch drive unit periodically sends a request signal to a display drive unit and executes it after receiving a touch scan command from the display drive unit A touch scanning procedure. After receiving the request signal, the display driving unit will interrupt a display procedure and send the touch scanning command, and store the display data to be buffered corresponding to the period of the touch scanning procedure to the memory In the body unit, or the period of the touch scanning process and the display data to be buffered corresponding to a period of time immediately before the period are stored in the memory unit, and after the touch scanning process ends, according to the waiting Cache display data for one-line displacement display operation or one-scan display operation.

Description

Touch display driving circuit, touch display device and information processing device with variable frame rate and fixed touch scanning frequency

The present invention relates to a touch display driving circuit, in particular to a touch display driving circuit with a variable frame rate (or frame rate) and a fixed touch scanning frequency.

With the continuous upgrading of smart phones, the specifications of touch screens have also been continuously improved. In order to meet the specifications of the touch screen, there are conventional technical solutions that integrate a touch drive circuit and a display drive circuit into a touch display driver integration (TDDI) chip. In a general touch display operation sequence of a touch display integrated driver chip, the touch scan period is usually interspersed in the gap of the display scan period.

In order to save power and extend the operating time of a smart phone, the display frame rate of a general smart phone will vary according to different operation modes; on the other hand, in order to provide users with a good touch operation experience, they generally hope The touch scan frequency can be fixed. However, since the gaps in the display scanning period must be used during the touch scan, it is difficult to balance the requirements of a variable display frame rate and a fixed touch scan frequency.

Therefore, there is an urgent need for a novel touch display driving circuit in the art.

An object of the present invention is to provide a touch display driving circuit that can meet the requirements of a full high definition (FHD) touch display device with variable display frame rate and fixed touch scanning frequency.

Another object of the present invention is to provide a touch display device that can maintain a fixed touch scanning frequency when the frame rate of the ultra-high-definition (FHD) display screen is variable.

Another object of the present invention is to provide an information processing device that can maintain a fixed touch scan frequency when the frame rate of the ultra-high-definition (FHD) display screen is variable.

In order to achieve the foregoing objective, a touch display drive circuit is proposed, which has a touch drive unit, a display drive unit and a memory unit, wherein the touch drive unit is used to sense a touch signal Measure the touch operation on a touch screen, and convert the sensed result into a digital data for transmission to an application processor; the display driving unit is used to generate a pixel voltage signal according to a display data to drive The touch screen is a pixel array; the touch display driving circuit is characterized by:

During operation, the touch drive unit periodically sends a request signal to the display drive unit and executes a touch scan procedure after receiving the display drive unit responds to a touch scan command. The display drive unit After receiving the request signal, a display program is interrupted and the touch scan command is sent, and the display data to be buffered corresponding to the period of the touch scan program is stored in the memory unit, or the touch scan program The display data to be buffered corresponding to a period of time immediately preceding the period is stored in the memory unit, and the display data to be buffered is read from the memory unit after the touch scanning process ends, and then The pixel voltage signal is generated according to the display data to be buffered to drive the pixel array of the touch screen.

In one embodiment, the period of the touch scan procedure covers a part of a frame, or covers a vertical synchronization signal front porch and a part of a frame, or covers a vertical synchronization signal back porch and a part of a frame , Or cover a vertical synchronization signal front porch, a vertical synchronization signal back porch and a part of a frame.

In one embodiment, the display driving unit performs a linear displacement display operation based on the display data to be buffered after the touch scanning process is finished.

In one embodiment, the display driving unit performs a rescanning display operation based on the display data to be buffered after the touch scanning process ends.

To achieve the above objective, the present invention further provides a touch display device having a touch display drive circuit, a touch screen and an application processor, wherein the touch display drive circuit has a touch drive unit, a A display drive unit and a memory unit. The touch drive unit is used to sense touch operations on the touch screen according to a touch signal, and convert the sensed result into a digital data for transmission to the Application processor; the display drive unit is used to generate a pixel voltage signal according to a display data to drive a pixel array of the touch screen; the touch display drive circuit is characterized by:

During operation, the touch drive unit periodically sends a request signal to the display drive unit and executes a touch scan procedure after receiving the display drive unit responds to a touch scan command. The display drive unit After receiving the request signal, a display program is interrupted and the touch scan command is sent, and the display data to be buffered corresponding to the period of the touch scan program is stored in the memory unit, or the touch scan program The display data to be buffered corresponding to a period of time immediately preceding the period is stored in the memory unit, and the display data to be buffered is read from the memory unit after the touch scanning process ends, and then The pixel voltage signal is generated according to the display data to be buffered to drive the pixel array of the touch screen.

In one embodiment, the period of the touch scan procedure covers a part of a frame, or covers a vertical synchronization signal front porch and a part of a frame, or covers a vertical synchronization signal back porch and a part of a frame , Or cover a vertical synchronization signal front porch, a vertical synchronization signal back porch and a part of a frame.

In one embodiment, the display driving unit performs a line displacement display operation or a rescan display operation based on the display data to be buffered after the touch scanning process is finished.

In one embodiment, the touch display device is an ultra-high-quality touch display device.

To achieve the above objective, the present invention further provides an information processing device, which has a central processing unit and the aforementioned touch display device, wherein the central processing unit is used to interact with the application in the touch display device Processor communication.

In a possible embodiment, the information processing device can be a smart phone or a portable computer.

Please refer to FIG. 1, which shows a block diagram of an embodiment of a touch display device using a touch display driving circuit with a variable frame rate and a fixed touch scanning frequency of the present invention. As shown in FIG. 1, a touch display device 100 has a touch display driving circuit 110, a touch screen 120 and an application processor 130.

The touch display drive circuit 110 has a touch drive unit 111, a display drive unit 112, and a memory unit 113. The touch drive unit 111 is used to sense the touch screen 120 according to a touch signal S _TOUCH The touch operation is performed, and the sensed result is converted into digital data D _TOUCH for transmission to the application processor 130.

The display drive unit 112 one line pixel array 120 to generate a pixel signal voltage S _DISP by a display data D _DISP to drive the touch screen.

The touch display device 100 is characterized in that during operation, the touch drive unit 111 periodically, for example, but not limited to, every 8.333 ms, sends a request signal REQ_TP to the display drive unit 112 and receives the display drive unit 112. After responding to a touch scanning command TPS, a touch scanning procedure is executed. After receiving the request signal REQ_TP, the display driving unit 112 will interrupt the display procedure and send out the touch scanning command TPS, and will communicate with the period of the touch scanning procedure ( For example, but not limited to 0.6 ms) the corresponding display data D _BUF to be buffered is stored in the memory unit 113, or the period of the touch scanning process and the display data D _BUF to be buffered corresponding to a previous time immediately adjacent to the period Stored in the memory unit 113, and after the touch scanning process is finished, the display data D _BUF to be buffered is read from the memory unit 113, and the pixel voltage signal S _{DISP is} generated according to the display data D _BUF to be buffered to drive the touch The pixel array of the screen 120. In addition, the period of each touch scanning procedure may just cover a part of a frame, or cover a vertical front porch (VFP) and a part of a frame, or cover a vertical synchronization signal. Back porch (VBP) and a part of a frame, or cover a vertical synchronization signal front porch (VFP), a vertical synchronization signal back porch (VBP) and a part of a frame. Please refer to FIGS. 2a-2d together, in which, FIG. 2a is a schematic diagram of covering a part of a frame during the touch scanning process of the touch display driving circuit of FIG. 1; FIG. 2b is a diagram of the touch display driving circuit of FIG. 1 A schematic diagram of a vertical synchronization signal front porch (VFP) and a part of a frame covered during the touch scanning process; FIG. 2c is a vertical synchronization signal back porch covered during the touch scanning process of the touch display driving circuit of FIG. 1 (VBP) and a schematic diagram of a part of a frame; Fig. 2d is a vertical sync signal front porch (VFP) and a vertical sync signal back porch (VBP) during the touch scanning process of the touch display driving circuit of Fig. 1 And a schematic diagram of a part of a frame.

Further, when the display driving unit 112 to be cached by the after touch scanner generates display data D _BUF pixel voltage signal S _DISP, in order to avoid the problem of visual effects, which can be treated buffer for display data D _BUF line shift ( Line shift operation or re-scan operation. Please also refer to FIGS. 3a-3b, where FIG. 3a shows the touch display driving circuit of FIG. 1 performing a line shift display operation on the buffered display data Y after a touch scan process (T _TPS ) Schematic diagram; and Figure 3b is a schematic diagram of the touch display driving circuit of Figure 1 performing a re-scan display operation on the buffered display data (X+Y) after a touch scanning process (T _TPS ) .

Accordingly, when applied to a full high definition (FHD) touch display device, the present invention can keep the touch report rate at 120 Hz within the frame rate range of 30 Hz to 90 Hz. In addition, for the application processor 130, it only needs to send the display data D _DISP of the screen to be displayed to the touch display driving circuit 110, and no other special processing actions are required.

Based on the above description, the present invention further provides an information processing device. Please refer to FIG. 4, which shows a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 4, an information processing device 200 has a central processing unit 210 and a touch display device 220. The touch display device 220 is implemented by the above touch display device 100, and the central processing unit 210 is used It communicates with an application processor (implemented by the aforementioned application processor 130) in the touch display device 220.

In addition, in possible embodiments, the information processing device 200 may be a smart phone or a portable computer.

According to the above description, the present invention can provide the following advantages:

1. The touch display driving circuit of the present invention can meet the requirements of a variable display frame rate and a fixed touch scanning frequency of an ultra-high image quality (FHD) touch display device.

2. The touch display device of the present invention can maintain a fixed touch scanning frequency under the condition that the frame rate of the ultra-high image quality (FHD) display screen is variable.

3. The information processing device of the present invention can maintain a fixed touch scanning frequency under the condition that the frame rate of the ultra-high image quality (FHD) display screen is variable.

The disclosure of the present invention is one of the preferred embodiments, and any partial changes or modifications that are derived from the technical ideas of the present invention and are easily inferred by those skilled in the art will not depart from the scope of the patent right of the present invention.

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

100: Touch display device

110: Touch display drive circuit

111: Touch drive unit

112: display drive unit

113: memory unit

120: touch screen

130: application processor

200: Information processing device

210: Central Processing Unit

220: Touch display device

In order to further reveal the specific technical content of the present invention, please first refer to the drawings, in which: FIG. 1 shows one of the touch display devices using the touch display driving circuit with variable frame rate and fixed touch scanning frequency of the present invention A block diagram of an embodiment; FIG. 2a is a schematic diagram of a part of a frame covered during the touch scan process of the touch display driving circuit of FIG. 1; FIG. 2b is a view of the touch scan process of the touch display driving circuit of FIG. A schematic diagram of covering a vertical synchronization signal front porch (VFP) and a part of a frame during the period; FIG. 2c is the period of the touch scanning process of the touch display driving circuit of FIG. 1 covering a vertical synchronization signal back porch (VBP) and a A schematic diagram of a part of the signal frame; Fig. 2d shows a vertical front porch (VFP) and a vertical back porch during the touch scanning process of the touch display driving circuit of Fig. 1 VBP) and a schematic diagram of a part of a frame; FIG. 3a is a line shift display of the buffered display data Y after a touch scan process (T _TPS ) by the touch display driving circuit of FIG. 1 Schematic diagram of operation; Figure 3b is a schematic diagram of the display operation of re-scanning (X+Y) the buffered display data (X+Y) by the touch display driving circuit of Figure 1 after a touch scanning process (T _TPS ) And Figure 4 shows a block diagram of an embodiment of the information processing device of the present invention.

100: Touch display device

110: Touch display drive circuit

111: Touch drive unit

112: display drive unit

113: memory unit

120: touch screen

130: application processor

Claims (7)

A touch display drive circuit, which has a touch drive unit, a display drive unit, and a memory unit, wherein the touch drive unit is used to sense a touch on a touch screen according to a touch signal Operate and convert the sensed result into a digital data to be sent to an application processor; the display driving unit is used to generate a pixel voltage signal according to a display data to drive a pixel array of the touch screen The touch display drive circuit is characterized in that: during operation, the touch drive unit periodically sends a request signal to the display drive unit and executes after receiving the display drive unit in response to a touch scan command A touch scanning procedure. After receiving the request signal, the display driving unit will interrupt a display procedure and send the touch scanning command, and store the display data to be buffered corresponding to the period of the touch scanning procedure to the memory In the body unit, or the period of the touch scanning process and the display data to be buffered corresponding to a period of time immediately before the period are stored in the memory unit, and from the memory unit after the touch scanning process ends Read the display data to be buffered, and then generate the pixel voltage signal according to the display data to be buffered to drive the pixel array of the touch screen; wherein, the display driving unit is in the touch After the scanning process ends, a one-line displacement display operation or a rescan display operation is performed according to the display data to be buffered. The touch display driving circuit described in the first item of the scope of patent application, wherein the period of the touch scanning process covers a part of a frame, or covers a vertical synchronization signal front porch and a part of a frame, or covers a The vertical synchronization signal back porch and a part of a frame, or cover a vertical synchronization signal front porch, a vertical synchronization signal back porch and a part of a frame. A touch display device has a touch display drive circuit, a touch screen, and an application processor. The touch display drive circuit has a touch drive unit, a display drive unit, and a memory unit. The touch drive unit is used to sense the touch operation on the touch screen according to a touch signal, and convert the sensed result into a digital data for transmission to the application processor; the display drive unit is used A pixel voltage signal is generated according to a display data to drive a pixel array of the touch screen; the touch display driving circuit is characterized by: During operation, the touch drive unit periodically sends a request signal to the display drive unit and executes a touch scan procedure after receiving the display drive unit responds to a touch scan command. The display drive unit After receiving the request signal, a display program is interrupted and the touch scan command is sent, and the display data to be buffered corresponding to the period of the touch scan program is stored in the memory unit, or the touch scan program The display data to be buffered corresponding to a period of time immediately preceding the period is stored in the memory unit, and the display data to be buffered is read from the memory unit after the touch scanning process ends, and then The pixel voltage signal is generated according to the display data to be buffered to drive the pixel array of the touch screen; wherein the display driving unit displays the display data according to the buffer to be buffered after the touch scanning process is finished The data performs a linear displacement display operation or a rescan display operation. For the touch display device described in item 3 of the scope of patent application, the period of the touch scanning process covers a part of a frame, or covers a vertical synchronization signal front porch and a part of a frame, or covers a The vertical synchronization signal back porch and a part of a frame, or cover a vertical synchronization signal front porch, a vertical synchronization signal back porch and a part of a frame. The touch display device described in item 3 of the scope of patent application is an ultra-high-quality touch display device. An information processing device has a central processing unit and the touch display device as described in any one of the 3 to 5 scope of the patent application, wherein the central processing unit is used to interact with the touch display device The application processor communicates. For example, the information processing device described in item 6 of the scope of patent application is a smart phone or a portable computer.

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