TWI804425B - Display driving method for avoiding interference with touch detection, driving chip and OLED touch display - Google Patents

Abstract

A display driving method for avoiding interference with touch detection, which is implemented by a driver chip, the method includes: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to Generate a detection result; and when the detection result represents a matching state, drive a touch panel to display in a mode of high-grayscale PWM dimming combined with a low-grayscale DC dimming mode or a full PWM dimming mode A picture corresponding to the display data of this frame.

Description

Display driving method for avoiding interference with touch detection, driving chip and OLED touch display

The present invention relates to a display driving method of a touch panel, in particular to a display driving method capable of avoiding interference with touch detection.

The OLED touch panel can prepare a touch sensor layer on an OLED thin-film encapsulation layer by means of etching, spin coating, etc. to realize a display-touch integration solution. This solution has the advantages of thin thickness, easy flexible deformation, and low cost, so it is widely used in medium and small-sized OLED touch panels.

However, since the vertical distance between the touch layer above the OLED encapsulation layer and the display cathode is only 7um~15um, during the display process, due to the parasitic capacitance between the display driving signal line and the display cathode, when the display driving signal jumps as a whole, As time changes, the voltage of the display cathode will fluctuate accordingly, causing the touch layer to be infected with an interference signal, and the greater the amplitude of the display driving signal in the adjacent row, the stronger the interference.

In order to solve the above problems, existing OLED touch panels generally use frequency hopping or synchronization to detect touch to avoid noise, but when the touch noise intensity of all frequency bands is quite large, there will still be touch false alarms point event occurs. For example: when the display device displays a screen with black and white stripes, the voltage of each display driving signal line on the display device fluctuates up and down at the same time. At this time, the noise value coupled to the touch sensor layer is the largest, and the higher the display brightness Higher, the greater the noise, the more prone to false positives in touch detection.

In order to solve the above problems, there is an urgent need in the art for a novel display driving method that avoids interference with touch detection.

One purpose of the present invention is to disclose a display driving method that avoids interference with touch detection, which can reduce the interference of high-brightness and high-noise display screens on touch detection through a composite display driving mode, thereby improving touch detection. The measured signal-to-noise ratio.

Another object of the present invention is to disclose a display driving method that avoids interference with touch detection, which can reduce the interference of high-brightness and high-noise display screens on touch detection through a composite display driving mode, thereby reducing touch Chance of false positive points.

Another object of the present invention is to disclose a driver chip, which can improve the signal-to-noise ratio of touch detection of an OLED touch panel and reduce the probability of touch false alarm points by the aforementioned method.

Another object of the present invention is to disclose an OLED touch display, which can improve the signal-to-noise ratio of the touch detection of the OLED touch panel and reduce the probability of touch false alarm points by using the aforementioned driving chip.

To achieve the aforementioned purpose, a display driving method that avoids interference with touch detection is proposed, which is realized by a driver chip, and the method includes: Using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result; and When the detection result is in a consistent state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive a touch panel to display the frame corresponding to the display data a picture.

In one embodiment, the high-noise frame detection operation includes detecting whether the frame display data contains data of a plurality of stripe patterns.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the gray scale value of the stripe pattern data is greater than a second threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold.

In one embodiment, when the detection result represents a non-conforming state, the driver chip drives the trigger in a full DC dimming mode or a high-grayscale DC dimming combined with low-grayscale PWM dimming mode. The control panel displays the picture corresponding to the frame display data.

To achieve the aforementioned purpose, the present invention further proposes a driver chip, which is used to implement a display driving method that avoids interference with touch detection, and the method includes: Using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result; and When the detection result is in a consistent state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive a touch panel to display the frame corresponding to the display data a picture.

In one embodiment, the high-noise frame detection operation includes detecting whether the frame display data contains data of a plurality of stripe patterns.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the gray scale value of the stripe pattern data is greater than a second threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold.

In one embodiment, when the detection result represents a non-conforming state, the driver chip drives the trigger in a full DC dimming mode or a high-grayscale DC dimming combined with low-grayscale PWM dimming mode. The control panel displays the picture corresponding to the frame display data.

To achieve the aforementioned purpose, the present invention further proposes an OLED touch display, which has an OLED touch panel and a driver chip for driving the OLED touch panel, and the driver chip is used to perform an interference avoidance touch detection A display driving method, and the method includes: Using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result; and When the detection result represents a matching state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive the OLED touch panel to display corresponding to the frame display data one of the screens.

In one embodiment, the high-noise frame detection operation includes detecting whether the frame display data contains data of a plurality of stripe patterns.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the gray scale value of the stripe pattern data is greater than a second threshold.

In one embodiment, the high-noise frame detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold.

In one embodiment, when the detection result represents a non-compliance state, the driver chip drives the OLED in a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode The touch panel displays the frame corresponding to the frame of display data.

In order to enable your review committee members to further understand the structure, features and purpose of the present invention, drawings and detailed descriptions of preferred specific embodiments are hereby attached.

Please refer to FIG. 1 , which shows a block diagram of an embodiment of the driving chip of the present invention. As shown in FIG. 1 , a driver chip 100 includes an image detection module 110 and a dimming module 120 to drive an OLED touch panel to display images, wherein the dimming module 120 has a mode selection unit 121, a A driving mode generating unit 122 for a high-noise picture, a driving mode generating unit 123 for a normal picture, and a driving unit 124 .

The driver chip 100 is used to execute a display driver program that avoids interference with touch detection. The driver program includes: (1) Using the image detection module 110 to perform a high-noise image detection operation on a frame of display data D _IN To generate a detection result signal _SD ; and (2) when the detection result signal _SD represents a consistent state, the drive mode selection unit 121 outputs a first enable signal EN1 to drive the high-noise picture drive mode to generate The unit 122 executes a high-noise picture driving mode to generate an output data D _OUT according to each display data D _IN to drive the driving unit 124 to generate a corresponding driving voltage V _G , thereby driving the OLED touch panel to display the frame display data D _IN corresponds to a frame, wherein the driving mode of the high-noise frame can be a mode of high-grayscale PWM dimming combined with a low-grayscale DC dimming or a full PWM dimming mode. When the high-noise picture driving mode is the high-grayscale PWM dimming mode combined with the low-grayscale DC dimming mode, the output data D _OUT represents the duty of a PWM signal when the display data D _IN is a high grayscale value ratio, and when the display data D _IN is a low grayscale value, it represents a DC voltage; and when the high-noise picture driving mode is the full PWM dimming mode, the output data D _OUT represents a duty cycle of a PWM signal.

In addition, when the detection result signal _SD represents a non-conforming state, the driving mode selection unit 121 outputs a second enable signal EN2 to drive the normal picture driving mode generating unit 123 to execute a normal picture driving mode, so as to The display data D _IN generates an output data D _OUT to drive the driving unit 124 to generate a corresponding driving voltage V _G , thereby driving the OLED touch panel to display a picture corresponding to the frame of display data D _IN , wherein the normal picture driving The mode can be a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode. When the normal picture driving mode is the full DC dimming mode, the output data D _OUT represents a DC voltage; and when the normal picture driving mode is the high grayscale DC dimming combined with the low grayscale PWM dimming mode , the output data D _OUT represents a DC voltage when the display data D _IN is a high gray scale value, and represents a duty ratio of a PWM signal when the display data D _IN is a low gray scale value.

In addition, in step (1), the high-noise frame detection operation includes detecting whether the frame display data contains data of a plurality of stripe patterns. In detail, the high-noise image detection operation may further include judging whether the continuous pixel length value of the stripe patterns is greater than a first threshold, whether the gray scale value of the data of the stripe patterns is greater than a second threshold, and the Whether the continuous pixel width values of the stripe patterns are greater than a third threshold, wherein the first threshold, the second threshold and the third threshold are positive real numbers independent of each other.

It can be seen from the above description that the present invention discloses a display driving method that avoids interference with touch detection. Please refer to FIG. 2 , which shows a flowchart of an embodiment of a display driving method for avoiding interference with touch detection of the present invention, which is implemented by a driving chip. As shown in Figure 2, the method includes: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result (step a); When the test results represent a consistent state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive a touch panel to display a picture corresponding to the frame of display data ( Step b).

In addition, when the detection result indicates an inconsistent state, the display driver chip can drive the touch panel display and The frame display data corresponds to the frame.

In addition, in the above steps, the high-noise frame detection operation may include detecting whether the frame display data contains data of a plurality of stripe patterns. In addition, the high-noise image detection operation may further include judging whether the continuous pixel length value of the stripe patterns is greater than a first threshold; whether the gray scale value of the data of the stripe patterns is greater than a second threshold; and whether the stripe patterns Whether the continuous pixel width value of the pattern is greater than a third threshold, wherein the first threshold, the second threshold and the third threshold are positive real numbers independent of each other.

According to the above description, the present invention further discloses an OLED touch display. Please refer to FIG. 3 , which shows a block diagram of an embodiment of an OLED touch display of the present invention. As shown in FIG. 3 , an OLED touch display 200 has an OLED touch panel 210 and a driver chip 220 for driving the OLED touch panel 210 , wherein the driver chip 220 is realized by the driver chip 100 .

With the design disclosed above, the present invention has the following advantages: 1. The display driving method of the present invention that avoids interference with touch detection can reduce the interference of high-brightness and high-noise display screens on touch detection through a composite display driving mode, thereby improving the signal-to-noise ratio of touch detection . 2. The display driving method of the present invention that avoids interference with touch detection can reduce the interference of high-brightness and high-noise display screens on touch detection through a composite display driving mode, thereby reducing the probability of false touch detection points. 3. The driving chip of the present invention can improve the signal-to-noise ratio of the touch detection of an OLED touch panel and reduce the probability of false touch detection points by the aforementioned method. 4. The OLED touch display of the present invention can improve the signal-to-noise ratio of the touch detection of the OLED touch panel and reduce the probability of touch false alarm points through the above-mentioned driving chip.

What is disclosed in this case is a preferred embodiment. For example, any partial changes or modifications derived from the technical ideas of this case and easily deduced by those who are familiar with the technology are within the scope of the patent right of this case.

To sum up, regardless of the purpose, means and efficacy of this case, it shows that it is very different from the conventional technology, and its first invention is practical, and it does meet the patent requirements of the invention. I implore your review committee to understand it clearly and grant a patent as soon as possible. Society is for the Most Prayer.

100: driver chip 110: Image detection module 120: Dimming module 121: Mode selection unit 122: High-noise picture drive mode generation unit 123: Normal picture driving mode generating unit 124: drive unit 200:OLED touch display 210: OLED touch panel 220: drive chip Step a: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result Step b: When the detection result represents a matching state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive a touch panel display and the frame display One of the screens corresponding to the data

FIG. 1 shows a block diagram of an embodiment of the driving chip of the present invention. FIG. 2 is a flowchart of an embodiment of a display driving method for avoiding interference with touch detection according to the present invention. FIG. 3 shows a block diagram of an embodiment of the OLED touch display of the present invention.

Step a: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate a detection result

Step b: When the detection result represents a matching state, use a high-grayscale PWM dimming mode combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive a touch panel display and the frame display One of the screens corresponding to the data

Claims (15)

A display driving method for avoiding interference with touch detection, which is implemented by a driver chip, the method includes: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to Generate a detection result; and when the detection result represents a matching state, drive a touch panel to display in a mode of high-grayscale PWM dimming combined with a low-grayscale DC dimming mode or a full PWM dimming mode A frame corresponding to the frame of display data; wherein, the high-noise frame detection operation includes detecting whether the frame of display data contains data of multiple stripe patterns. According to the display driving method for avoiding interference with touch detection described in item 1 of the scope of the patent application, the high-noise image detection operation further includes judging whether the continuous pixel length value of the stripe patterns is greater than a first threshold. According to the display driving method for avoiding interference with touch detection described in item 2 of the scope of the patent application, the high-noise image detection operation further includes judging whether the gray scale value of the stripe pattern data is greater than a second threshold. In the display driving method for avoiding interference with touch detection described in item 3 of the scope of the patent application, the high-noise image detection calculation further includes determining whether the continuous pixel width value of the stripe patterns is greater than a third threshold. The display driving method for avoiding interference with touch detection as described in Item 1 of the scope of the patent application, wherein, when the detection result indicates a non-conforming state, the driving chip is a completely direct current The dimming mode or a mode of high-grayscale DC dimming combined with low-grayscale PWM dimming drives the touch panel to display the image corresponding to the frame of display data. A driver chip, used to implement a display driving method that avoids interference with touch detection, the method includes: using an image detection module in the driver chip to perform a high-noise image detection operation on a frame of display data to generate A detection result; and when the detection result represents a consistent state, drive a touch panel display and display with a high grayscale PWM dimming mode combined with a low grayscale DC dimming mode or a full PWM dimming mode The frame of display data corresponds to a frame; wherein, the high-noise frame detection operation includes detecting whether the frame of display data contains data of multiple stripe patterns. In the driving chip as described in claim 6 of the patent application, wherein the high-noise image detection operation further includes judging whether the continuous pixel length value of the stripe patterns is greater than a first threshold. In the driver chip described in claim 7 of the patent application, wherein the high-noise image detection operation further includes judging whether the grayscale value of the stripe pattern data is greater than a second threshold. In the driving chip described in claim 8 of the patent application, the high-noise image detection operation further includes judging whether the continuous pixel width value of the stripe patterns is greater than a third threshold. The driver chip as described in item 6 of the scope of the patent application, wherein, when the detection result represents a non-conformity state, the driver chip is in a full DC dimming mode or a high-grayscale DC dimming combined with low-gray The step PWM dimming mode drives the touch panel to display the picture corresponding to the frame of display data. An OLED touch display has an OLED touch panel and a driver chip for driving the OLED touch panel, the driver chip is used to implement a display driving method that avoids interference with touch detection, the method includes: using An image detection module in the driver chip performs a high-noise image detection operation on a frame of display data to generate a detection result; Dimming is combined with a low-grayscale DC dimming mode or a full PWM dimming mode to drive the OLED touch panel to display a picture corresponding to the frame of display data; wherein, the high-noise picture detection operation includes detecting the frame Indicates whether the data contains data with multiple stripe patterns. In the OLED touch display described in claim 11 of the patent application, the high-noise image detection operation further includes determining whether the continuous pixel length value of the stripe patterns is greater than a first threshold. In the OLED touch display as described in claim 12 of the patent application, the high-noise image detection operation further includes determining whether the grayscale value of the stripe pattern data is greater than a second threshold. In the OLED touch display as described in claim 13 of the patent application, the high-noise image detection operation further includes determining whether the continuous pixel width value of the stripe patterns is greater than a third threshold. The OLED touch display as described in item 11 of the scope of the patent application, wherein, when the detection result represents a non-conforming state, the driver chip is in a full DC dimming mode or a high The mode of grayscale DC dimming combined with low grayscale PWM dimming drives the OLED touch panel to display the picture corresponding to the frame of display data.

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