CN102236449A - Panel control device and operation method thereof - Google Patents

Abstract

A panel control device and an operation method thereof. The panel control device includes a display controller and a touch controller. The display controller drives the touch display panel module to display an image. The touch controller senses a touch event of the touch display panel module. According to the driving operation of the display controller, the sensing operation of the touch controller is correspondingly enabled or disabled.

Description

Panel control device and its operation method

technical field

The present invention relates to a touch device, in particular to a panel control device for a touch display panel module and an operation method thereof.

Background technique

Currently, a display system with a touch function is implemented by using the touch system and the display system as independent systems in practice. System integration and cost reduction are the constant directions of the electronics industry. If the controller of the touch control system and the controller of the display system are integrated into the same integrated circuit, the application circuit on the printed circuit board (PCB) can be effectively simplified. In general, touch systems must detect electrical differences between touch and non-touch. The electrical difference is generally very small, and considerable attention must be paid to the prevention and control of noise interference. However, under the development trend of mutual integration of the touch system and the display system, the interference between the touch system and the display system is becoming more and more serious.

Contents of the invention

The invention provides a panel control device and an operation method thereof, which synchronize a touch control system and a display system to improve mutual interference between the touch control system and the display system.

An embodiment of the present invention provides a panel control device, including a display controller and a touch controller. The display controller drives the touch display panel module to display images. The touch controller senses a touch event of the touch display panel module. Wherein, according to the driving operation of the display controller, the sensing operation of the touch controller is correspondingly enabled or disabled.

An embodiment of the present invention proposes a method for operating a panel control device, including: driving a touch display panel module to display an image; sensing a touch event of the touch display panel module; and correspondingly causing the touch event according to the driving operation. enabling or disabling the sensing operation.

Based on the above, the panel control device and its operating method disclosed in the embodiments of the present invention will correspondingly enable or disable the sensing operation of the touch controller according to the driving operation of the display controller. Therefore, the panel control device and its operation method disclosed in the embodiments of the present invention can synchronize the touch system and the display system, and improve the mutual interference between the touch system and the display system.

In order to make the above-mentioned features and advantages of the present invention more comprehensible, the following specific embodiments and the accompanying drawings are described in detail as follows.

Description of drawings

Figure 1 illustrates the input data of a typical display system.

FIG. 2 is a schematic diagram illustrating functional modules of a panel control device according to an embodiment of the present invention.

FIG. 3 illustrates the timing relationship between polarity control signals and driving voltages according to an embodiment of the present invention.

FIG. 4 illustrates the timing relationship between the line latch signal and the driving voltage according to an embodiment of the present invention.

FIG. 5 illustrates an operation method of a panel control device according to an embodiment of the present invention.

Description of reference symbols

200: touch display panel module

210: Touch Controller

220: display controller

C: touch coordinates

D: pixel data

EN: enable signal

LD: Line latch signal

LD', POL': delayed signal

POL: polarity control signal

S510～S530: Operation steps of panel control device

T1: During polarity reversal

T2: during data conversion

Vcom: common voltage

V _D : driving voltage

Detailed ways

In general display systems, horizontal and vertical display information and control information have fixed periods and patterns, while touch systems also calculate touch positions based on horizontal and vertical detection information. The following embodiments synchronize the touch system and the display system, and make better arrangements for application features and functions. In particular, when the touch controller of the touch system and the display controller of the display system are integrated into the same integrated circuit, the effect of the following embodiments on improving mutual interference between the touch system and the display system is more obvious.

On the other hand, when the display panel and the touch panel are further integrated, that is, integrated into the same process, the distance between the display cell and the touch detection component (such as a capacitor) is closer, and the relative interference is more significant. For such a touch system, the noise interference brought by the display system will be even greater. Therefore, it is more important to avoid mutual interference by synchronizing the operation of the touch control system and the display system.

Figure 1 illustrates the input data of a typical display system. The general display system uses the vertical synchronization signal (Vsync) to define the time slot of the picture (Frame), and in one picture, multiple horizontal synchronization signals (Hsync) define the time slots of multiple lines (called scanning lines or horizontal lines). time slot. Each Frame has a Frame Blanking period, and each Line has a Line Blanking period. The operation of the traditional display system is that the display controller controls the source driver (Source Driver) to store the pixel data one by one during the transmission of pixel data. When the pixel data of one line is stored, the display controller will control the source driver to simultaneously send the potential corresponding to the pixel data to the display panel, and then cooperate with the timing of the gate driver (Gate Driver) to make the display panel display the corresponding image. The operation program of such an image display system has a certain sequence and cycle, and correspondingly, the power consumption of the circuit of the display system also has a certain sequence and cycle. The polarity inversion mode (Inversion mode) adopted by the display system also has a certain order and cycle for the power consumption of the system.

FIG. 2 is a schematic diagram illustrating functional modules of a panel control device according to an embodiment of the present invention. The panel control device includes a touch controller (touch controller) 210 and a display controller (display controller) 220 . The touch display panel module 200 in FIG. 2 includes a display panel and a touch panel. The display panel and the touch panel can be two independent panels, or can be integrated into a single panel.

The display controller 220 receives the pixel data D, and drives the display panel of the touch display panel module 200 through the source driver and the gate driver (hereinafter referred to as driving operation), so that the display panel displays images. According to product design requirements, the aforementioned source driver and gate driver can be configured in the touch display panel module 200 or in the display controller 220 . The touch controller 210 senses a touch event of the touch display panel module 200 (hereinafter referred to as a sensing operation), and outputs a touch coordinate C.

According to the driving operation of the display controller 220 , the sensing operation of the touch controller 210 can be enabled or disabled accordingly. That is to say, when the touch system and the display system can operate synchronously, the touch system can use the appropriate time period when the display system consumes less power or has less noise interference, such as the line blank period or the screen blank period, to perform touch control. The touch detection of the control panel is used to minimize noise interference and obtain a more correct detection value (touch coordinate C). Relatively, this embodiment can reduce the burden of subsequent processing noise interference, and reduce the difficulty of judging the detection value interfered by noise.

In the first embodiment, the display controller 220 can output a vertical synchronization signal to the touch controller 210 . As described above, the vertical synchronization signal defines the screen blanking period in one screen. The display controller 220 will not drive the touch display panel module 200 during the blank period of the screen, that is, the display system will not interfere with the touch system during the blank screen. Therefore, the touch controller 210 can enable the sensing operation during the blank period of the screen according to the vertical synchronization signal, and disable the sensing operation after the blank period of the screen ends.

In the second embodiment, the display controller 220 outputs a horizontal synchronization signal to the touch controller 210 . As described above, the horizontal synchronization signal defines a plurality of line periods in one screen, and a line blank period between two adjacent line periods. The display controller 220 will not drive the touch display panel module 200 during this line blank period, that is, the display system will not interfere with the touch control system during this line blank period. Therefore, the touch controller 210 can enable the sensing operation during the line blank period according to the horizontal synchronization signal, and disable the sensing operation after the line blank period ends.

In the third embodiment, the display controller 220 outputs the vertical synchronization signal and the horizontal synchronization signal to the touch controller 210 . Therefore, the touch controller 210 can enable the sensing operation during the screen blank period or the line blank period according to the vertical synchronization signal and the horizontal synchronization signal, and during the screen blank period and not outside the line blank period The sensing operation is disabled for a period of time.

In the fourth embodiment, the display controller 220 outputs the polarity control signal POL to the touch controller 210 . The display controller 220 also outputs the polarity control signal POL to the source driver (not shown). FIG. 3 illustrates the timing relationship between the polarity control signal POL and the driving voltage V _D according to an embodiment of the present invention. When the polarity control signal POL changes state, the source driver will change the polarity of the voltage V _D driving the touch display panel module 200 according to the polarity control signal POL. The polarity of the driving voltage V _D is determined with reference to the common voltage Vcom. During the moment when the driving voltage V _D changes polarity (for example, the polarity inversion period T1 shown in FIG. 3 ), the source driver consumes more power to change the driving voltage V _D . That is to say, the display system is more likely to interfere with the touch system during the polarity inversion period T1. Therefore, the touch controller 210 can disable the sensing operation during the polarity inversion period T1 according to the polarity control signal POL, and enable the sensing operation after the polarity inversion period T1 ends. The touch controller 210 may define the polarity inversion period T1 in any manner. For example, the touch controller 210 can delay the polarity control signal POL to obtain a delayed signal POL', and then perform an inverse exclusive OR (XNOR) operation on the polarity control signal POL and the delayed signal POL' to obtain an enable signal EN, as Figure 3 shows. The touch controller 210 can enable/disable the sensing operation according to the level of the enable signal EN.

In the fifth embodiment, the polarity control signal POL is output from the touch controller 210 to the display controller 220 . Similar to the fourth embodiment, the touch controller 210 disables the sensing operation during the polarity inversion period T1, and its detailed implementation content can refer to the fourth embodiment. The difference is that in this embodiment, the touch controller 210 provides the polarity control signal POL. When the touch controller 210 makes the polarity control signal transition, the display controller 220 will change the polarity of the driving voltage V _D according to the polarity control signal POL.

In the sixth embodiment, the display controller 220 outputs the line latch signal LD to the touch controller 210 . The display controller 220 also outputs the line latch signal LD to the source driver (not shown). FIG. 4 illustrates the timing relationship between the line latch signal LD and the driving voltage V _D according to an embodiment of the present invention. When the line latch signal LD has a pulse (pulse), the source driver will simultaneously send the potential corresponding to the pixel data to the display panel, so the voltage V _D driving the touch display panel module 200 will be changed in level (ie to change the gray scale). During the instant when the driving voltage V _D changes levels (for example, the data conversion period T2 shown in FIG. 4 ), the source driver consumes more power to change the driving voltage V _D . That is to say, the display system is more likely to interfere with the touch system during the data conversion period T2. Therefore, the touch controller 210 disables the sensing operation during the data conversion period T2 according to the line latch signal LD, and enables the sensing operation after the data conversion period T2 ends. The touch controller 210 can define the data conversion period T2 in any manner. For example, the touch controller 210 can delay the line latch signal LD to obtain a delayed signal LD', and then perform a NOR (NOR) operation on the line latch signal LD and the delayed signal LD' to obtain an enable signal EN, as shown in FIG. 4 shown. The touch controller 210 can enable/disable the sensing operation according to the level of the enable signal EN. In another embodiment, if the pulse width of the line latch signal LD is larger than the data conversion period (such as the data conversion period T2 in FIG. 4 ), the line latch signal LD can be directly used as a control device for the sensing operation. The disabling signal (that is, the inversion signal of the enabling signal EN), and the aforementioned delay operation and NOR operation are omitted.

In the seventh embodiment, the line latch signal LD is output from the touch controller 210 to the display controller 220 . Similar to the sixth embodiment, the touch controller 210 disables the sensing operation during the data conversion period T2, and its detailed implementation content can refer to the fourth embodiment. The difference is that in this embodiment, the touch controller 210 provides the line latch signal LD. When the touch controller 210 outputs the line latch signal LD with pulses to the display controller 220, the display controller 220 will correspondingly change the level of the driving voltage _VD .

In the eighth embodiment, the display controller 220 can output the enable signal EN to the touch controller 210 . That is to say, the display controller 220 can perform the methods disclosed in any one or more of the foregoing embodiments to generate the enable signal EN to the touch controller 210 . The touch controller 210 correspondingly enables or disables the sensing operation according to the enable signal EN.

The above-mentioned embodiments are combined to describe the operation method of the panel control device. FIG. 5 illustrates an operation method of a panel control device according to an embodiment of the present invention. In step S510, the display controller 220 drives the touch display panel module 200 to display images. In step S520 , the touch controller 210 correspondingly determines whether to enable or disable the sensing operation according to the driving operation of the display controller 220 . If step S520 determines to disable the sensing operation, go back to step S510. If step S520 determines to enable the sensing operation, then the touch controller 210 proceeds to step S530 to sense a touch event that touches the display panel module 200 . The detailed implementation manner of the above step S520 has been described in the aforementioned first embodiment to the eighth embodiment, and will not be repeated here.

In summary, the panel control device and its operating method disclosed in the above-mentioned embodiments will correspondingly enable or disable the sensing operation of the touch controller 210 according to the driving operation of the display controller 220 . Therefore, the panel control device and its operation method disclosed in these embodiments can synchronize the touch system and the display system, and improve the mutual interference between the touch system and the display system.

Although the present invention has been disclosed above with embodiments, it is not intended to limit the present invention. Those skilled in the art can make some changes and modifications without departing from the spirit and scope of the present invention. Therefore, the present invention The scope of protection is based on the claims of the present application.

Claims (15)

1. A panel control device, comprising: a display controller, driving a touch display panel module to display images; and A touch controller senses a touch event of the touch display panel module, wherein the sensing operation of the touch controller is enabled or disabled correspondingly according to the driving operation of the display controller. 2. The panel control device as claimed in claim 1, wherein the display controller outputs a vertical synchronization signal to the touch controller, and the touch controller enables the sensing operation. 3. The panel control device as claimed in claim 1, wherein the display controller outputs a horizontal synchronous signal to the touch controller, and the touch controller enables the sensor during a blank period according to the horizontal synchronous signal. test operation. 4. The panel control device as claimed in claim 1, wherein the display controller outputs a vertical synchronization signal and a horizontal synchronization signal to the touch controller, and the touch controller is synchronized with the horizontal synchronization signal according to the vertical synchronization signal The signal enables the sensing operation during a vertical blank period of a frame or a horizontal blank period of a line. 5. The panel control device as claimed in claim 1, wherein the display controller outputs a polarity control signal to the touch controller, and the touch controller operates according to the polarity control signal during a polarity inversion period The sensing operation is disabled, and the sensing operation is not enabled during the polarity inversion. 6. The panel control device as claimed in claim 1, wherein the touch controller outputs a polarity control signal to the display controller, and the touch controller disables the sensing during a polarity inversion operation, and inverts the polarity control signal. 7. The panel control device as claimed in claim 1, wherein the display controller outputs a line latch signal to the touch controller, and the touch controller disables all devices during a data conversion according to the line latch signal The sensing operation is enabled, and the sensing operation is not enabled during the data conversion period. 8. The panel control device as claimed in claim 1, wherein the touch controller disables the sensing operation during a data conversion period, and outputs a one-line latch signal to the display controller. 9. The panel control device as claimed in claim 1, wherein the display controller outputs an enable signal to the touch controller, and the touch controller correspondingly enables or disables the sensing operation. 10. A method for operating a panel control device, comprising: driving a touch display panel module to display images; Sensing a touch event of the touch display panel module; and According to the driving operation, the sensing operation is enabled or disabled correspondingly. 11. The operation method of the panel control device according to claim 10, wherein the step of enabling or disabling the sensing operation comprises: The sensing operation is enabled during a frame blank period according to a vertical synchronization signal. 12. The operation method of the panel control device according to claim 10, wherein the step of enabling or disabling the sensing operation comprises: The sensing operation is enabled during a blank period according to a horizontal synchronization signal. 13. The operation method of the panel control device according to claim 10, wherein the step of enabling or disabling the sensing operation comprises: The sensing operation is enabled during a frame blank period or a line blank period according to a vertical synchronization signal and a horizontal synchronization signal. 14. The operation method of the panel control device according to claim 10, wherein the step of enabling or disabling the sensing operation comprises: disabling the sensing operation during a polarity inversion according to a polarity control signal; and The sensing operation is not enabled during the polarity inversion. 15. The operation method of the panel control device according to claim 10, wherein the step of enabling or disabling the sensing operation comprises: disabling the sensing operation during a data transition according to a one-line latch signal; and The sensing operation is not enabled during the data conversion.

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