TW202410681A - Display driving method, driver chip and OLED touch display of avoiding interfering touch detection characterized by using a composite display driving mold to reduce the interference of high-brightness and high-noise display image on touch detection - Google Patents

Abstract

A display driving method of avoiding interfering touch detection is realized by a driver chip. The method comprises: using an image detection module in the driver chip to perform a high-noise picture detection computing on the display data to generate a detection result; and using a mode of high grayscale PWM dimming acting in concert with a low grayscale DC dimming or a complete PWM dimming mold to drive a touch panel to display a picture corresponding to the display data, when the detection result represents a consistent state.

Description

Display driving methods, driver chips and OLED touch displays to avoid interference with touch detection

The present invention relates to a display driving method for a touch panel, and more particularly to a display driving method that can avoid interference with touch detection.

OLED touch panels can be fabricated with a touch sensor layer on an OLED film encapsulation layer by etching, spin coating, etc. to achieve a display-touch integrated solution. This solution has the advantages of thin thickness, easy flexibility 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 located above the OLED packaging layer and the display cathode is only 7um~15um, during the display process, there is a parasitic capacitance between the display driving signal line and the display cathode. Therefore, when the display driving signal jumps as a whole, When the voltage of the display cathode changes, the voltage of the display cathode will fluctuate, causing the touch layer to be infected with an interference signal. The greater the amplitude of the display driving signal in adjacent rows, the stronger the interference.

To solve the above problems, existing OLED touch panels generally use frequency hopping or synchronization to detect touches to avoid noise. However, when the touch noise intensity of all frequency bands is quite large, false touch alarms will still occur. For example, when the display device displays a picture with black and white stripes, the voltage of each display drive 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, the greater the noise, and the easier it is for touch detection to have false alarms.

In order to solve the above problems, a novel display driving method that avoids interference with touch detection is urgently needed in this field.

One purpose of the present invention is to disclose a display driving method that avoids interference with touch detection. It 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. Measured signal-to-noise ratio.

Another object of the present invention is to disclose a display driving method that avoids interference with touch detection. It can reduce the interference of high-brightness and high-noise display screens on touch detection through a composite display driving mode, thereby reducing the risk of touch detection. The probability 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 false touch 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 touch detection of its OLED touch panel and reduce the probability of false touch alarms by using the aforementioned driver chip.

In order to achieve the aforementioned purpose, a display driving method is proposed to avoid interference with touch detection, which is implemented by a driving chip, and the method includes: Utilize an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a consistent state, a touch panel is driven to display corresponding to the frame display data using a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. One picture.

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

In one embodiment, the high noise image 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 image detection operation further includes determining whether the grayscale value of the data of the stripe patterns is greater than a second threshold.

In one embodiment, the high-noise picture 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-compliant state, the driver chip drives the touch panel to display the screen corresponding to the frame display data in a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode.

In order to achieve the aforementioned objectives, the present invention further proposes a driving chip that is used to perform a display driving method to avoid interference with touch detection. The method includes: Utilize an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a consistent state, a touch panel is driven to display corresponding to the frame display data using a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. One picture.

In one embodiment, the noisy frame detection operation includes detecting whether the frame of display data includes data of a plurality of stripe patterns.

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

In one embodiment, the high-noise picture 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-compliant state, the driver chip drives the touch screen in a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode. The control panel displays the screen corresponding to the frame display data.

To achieve the above-mentioned 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, the driver chip is used to execute a display driving method to avoid interference with touch detection, and the method includes: Using an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a conforming state, a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode is used to drive the OLED touch panel to display a picture corresponding to the frame of display data.

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

In one embodiment, the high noise image 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 picture detection operation further includes determining whether the grayscale value of the stripe pattern data is greater than a second threshold.

In one embodiment, the high-noise picture 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-compliant state, the driver chip drives the OLED touch panel to display the screen corresponding to the frame display data in a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode.

In order to enable the Review Committee to further understand the structure, features and purpose of the present invention, the following are attached with drawings and detailed descriptions of preferred specific embodiments.

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

The driver chip 100 is used to execute a display driver program for avoiding interference touch detection, and the driver program includes: (i) using the image detection module 110 to perform a high noise picture detection operation on a frame of display data D _IN to generate a detection result signal _SD ; and (ii) when the detection result signal _SD represents a matching state, the driving mode selection unit 121 outputs a first enabling signal EN1 to drive the high noise picture driving mode generating unit 122 to execute a high noise picture driving mode, so as 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 a picture corresponding to the frame display data D _IN , wherein the high noise picture driving mode can be a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. When the high noise picture driving mode is the high grayscale PWM dimming mode with the low grayscale DC dimming mode, the output data D _OUT represents a duty cycle of a PWM signal when the display data D _IN is a high grayscale value, and represents a DC voltage when the display data D _IN is a low grayscale value; 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-compliant state, the driving mode selection unit 121 outputs a second enabling signal EN2 to drive the normal picture driving mode generating unit 123 to execute a normal picture driving mode, so as 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 a picture corresponding to the frame display data D _IN , wherein the normal picture driving mode can be a full DC dimming mode or a high grayscale DC dimming combined with a low grayscale PWM dimming mode. When the normal screen driving mode is the full DC dimming mode, the output data D _OUT represents a DC voltage; and when the normal screen 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 grayscale value, and represents a duty cycle of a PWM signal when the display data D _IN is a low grayscale value.

In addition, in step (1), the high-noise picture detection operation includes detecting whether the frame display data includes data of multiple stripes patterns. In detail, the high-noise picture detection operation may further include determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold, whether the grayscale values of the stripe pattern data are greater than a second threshold, and the Whether the continuous pixel width values of some stripe patterns are greater than a third threshold, wherein the first threshold, the second threshold and the third threshold are positive real numbers that are independent of each other.

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

In addition, when the detection result represents a non-compliant state, the display driver chip can drive the touch panel to display the screen corresponding to the frame display data in a full DC dimming mode or a high grayscale DC dimming combined with low grayscale PWM dimming mode.

In addition, in the above steps, the high-noise image detection operation may include detecting whether the frame display data includes data of multiple stripe patterns. In addition, the high-noise image detection operation may further include determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold value; whether the grayscale values of the data of the stripe patterns are greater than a second threshold value; and whether the continuous pixel width values of the stripe patterns are greater than a third threshold value, wherein the first threshold value, the second threshold value, and the third threshold value are independent positive real numbers.

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 the 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 implemented by the driver chip 100.

Through the above disclosed design, the present invention has the following advantages: 1. The display driving method of the present invention for avoiding interference with touch detection can reduce the interference of high brightness and high noise display screen 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 for avoiding interference with touch detection can reduce the interference of high brightness and high noise display screen on touch detection through a composite display driving mode, thereby reducing the probability of false touch points. 3. The driver chip of the present invention can improve the signal-to-noise ratio of touch detection of an OLED touch panel and reduce the probability of false touch points through the above method. 4. The OLED touch display of the present invention can improve the signal-to-noise ratio of touch detection of its OLED touch panel and reduce the probability of false touch alarms through the aforementioned driver chip.

What is disclosed in this case is a preferred embodiment. Any partial changes or modifications derived from the technical ideas of this case and easily inferred by those familiar with the art will not deviate from the scope of the patent rights of this case.

To sum up, regardless of the purpose, means and effects of this case, it shows that it is completely different from the conventional technology, and that the invention is practical first, and indeed meets the patent requirements for inventions. I sincerely ask the review committee to take a clear look and grant the patent as soon as possible for your benefit. Society is a prayer for the Supreme Being.

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 drive mode generation unit 124: driver unit 200: OLED touch display 210: OLED touch panel 220: driver chip Step a: use an image detection module in the driver chip to perform a high noise picture detection operation on a frame of display data to generate a detection result Step b: When the detection result represents a matching state, a high grayscale PWM dimming mode combined with a low grayscale DC dimming mode or a full PWM dimming mode is used to drive a touch panel to display a screen corresponding to the frame display data

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

Step a: Use 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, a high grayscale PWM dimming mode combined with a low grayscale DC dimming mode or a full PWM dimming mode is used to drive a touch panel to display a screen corresponding to the frame display data

Claims (18)

A display driving method that avoids interference with touch detection is implemented by a driver chip. The method includes: Utilize an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a consistent state, a touch panel is driven to display corresponding to the frame display data using a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. One picture. The display driving method to avoid interference with touch detection as described in claim 1, wherein the high-noise picture detection operation includes detecting whether the frame of display data contains data of multiple stripes patterns. In the display driving method to avoid interference with touch detection as described in item 2 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold. As described in item 3 of the patent application, in the display driving method to avoid interference with touch detection, the high-noise picture detection operation further includes determining whether the gray scale value of the stripe pattern data is greater than a second threshold. In the display driving method to avoid interference with touch detection as described in item 4 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold. As described in item 1 of the patent application scope, a display driving method for avoiding interference with touch detection, wherein, when the detection result represents a non-compliant state, the driver chip drives the touch panel to display the screen corresponding to the frame display data in a full DC dimming mode or a high grayscale DC dimming combined with a low grayscale PWM dimming mode. A driver chip used to perform a display driving method to avoid interference with touch detection. The method includes: Utilize an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a consistent state, a touch panel is driven to display corresponding to the frame display data using a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. One picture. The driver chip of claim 7, wherein the high-noise picture detection operation includes detecting whether the frame display data includes data of multiple stripes patterns. In the driving chip described in claim 8 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold. For the driver chip described in claim 9, the high-noise image detection operation further includes determining whether the grayscale values of the stripe pattern data are greater than a second threshold. For the driver chip described in claim 10 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold. The driving chip as described in item 7 of the patent application, wherein when the detection result represents a non-compliant state, the driving chip operates in a full DC dimming mode or a high gray scale DC dimming with low gray The step PWM dimming mode drives the touch panel to display the image corresponding to the frame 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 execute a display driving method to avoid interference with touch detection, the method comprising: Using an image detection module in the driver chip to perform a high-noise picture detection operation on a frame of display data to generate a detection result; and When the detection result represents a conforming state, driving the OLED touch panel to display a picture corresponding to the frame of display data in a high grayscale PWM dimming mode with a low grayscale DC dimming mode or a full PWM dimming mode. An OLED touch display as described in claim 13, wherein the high noise picture detection operation includes detecting whether the frame display data contains data of multiple stripe patterns. For the OLED touch display described in claim 14 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel length values of the stripe patterns are greater than a first threshold. As described in claim 15 of the OLED touch display, the high noise image detection operation further includes determining whether the grayscale value of the data of the stripe patterns is greater than a second threshold. For the OLED touch display described in claim 16 of the patent application, the high-noise picture detection operation further includes determining whether the continuous pixel width values of the stripe patterns are greater than a third threshold. As described in item 13 of the patent application scope, the OLED touch display, wherein when the detection result represents a non-compliant state, the driver chip drives the OLED touch panel to display the screen corresponding to the frame display data in a full DC dimming mode or a high grayscale DC dimming combined with a low grayscale PWM dimming mode.

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