TWI833338B - Display driving methods, driver chips and OLED touch displays to avoid interference with touch detection - Google Patents

Abstract

A display driving method that avoids interference with touch detection is implemented by a driver chip. 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. Generate a detection result; and when the detection result represents a consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce the touch noise intensity with the goal of making the touch noise intensity less than a threshold. The gray scale value of each display data is used to generate a first output data respectively, and a brightness compensation operation is performed on each first output data to generate a PWM duty cycle. According to the first output data and the PWM duty cycle Generate an output data, and generate a driving voltage and a PWM signal according to the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness detection module The difference between a measured brightness value and an ideal corresponding brightness value adjusts the PWM duty cycle.

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 in particular, to a display driving method that can avoid interference with touch detection.

OLED touch panels can prepare a touch sensor layer on an OLED film encapsulation layer by means of etching, spin coating, etc. to achieve an integrated display-touch 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 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.

In order to solve the above problems, existing OLED touch panels generally use frequency hopping or synchronization methods for touch detection to avoid noise. However, when the intensity of touch noise in all frequency bands is considerable, false touch alarms will still occur. point event occurs. For example: when the display device displays a picture with intervals of 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 display brightness becomes higher and higher. High, the greater the noise, the easier it is for touch detection to have false alarm points.

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 that can improve the signal-to-noise ratio of touch detection of an OLED touch panel and reduce the probability of false alarm points of touch by using the aforementioned method.

Another object of the present invention is to disclose an OLED touch display that can improve the signal-to-noise ratio of touch detection of its OLED touch panel and reduce the probability of false alarm points of its touch 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, perform the following steps: detect a touch noise intensity; and gradually reduce the grayscale of each display data under the condition that the touch noise intensity is less than a threshold. values to respectively generate a first output data, perform a brightness compensation operation on each of the first output data to generate a PWM duty cycle, generate an output data according to the first output data and the PWM duty cycle, and A driving voltage and a PWM signal are generated according to the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness value measured by a brightness detection module The difference from an ideal corresponding brightness value adjusts the PWM duty cycle.

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-conforming state, the driving chip directly generates a corresponding driving voltage and a corresponding PWM signal according to the display data to drive the touch panel to display the corresponding state. The frame display data corresponds to the screen.

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: 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 consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce the grayscale of each display data under the condition that the touch noise intensity is less than a threshold. values to respectively generate a first output data, perform a brightness compensation operation on each of the first output data to generate a PWM duty cycle, generate an output data according to the first output data and the PWM duty cycle, and A driving voltage and a PWM signal are generated according to the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness value measured by a brightness detection module The difference from an ideal corresponding brightness value adjusts the PWM duty cycle.

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-conforming state, the driving chip directly generates a corresponding driving voltage and a corresponding driving voltage according to each display data. The corresponding PWM signal drives the touch panel to display the image corresponding to the frame display data.

In order to achieve the above object, the present invention further proposes an OLED touch display, which has an OLED touch panel and a driving chip for driving the OLED touch panel. The driving chip is used to perform an operation to avoid interference with touch detection. display driver method, 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, perform the following steps: detect a touch noise intensity; and gradually reduce the grayscale of each display data under the condition that the touch noise intensity is less than a threshold. values to respectively generate a first output data, perform a brightness compensation operation on each of the first output data to generate a PWM duty cycle, generate an output data according to the first output data and the PWM duty cycle, and A driving voltage and a PWM signal are generated according to the output data to drive the OLED touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on the brightness measured by a brightness detection module. The difference between the value and an ideal corresponding brightness value adjusts the PWM duty cycle.

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 driving chip directly generates a corresponding driving voltage and a corresponding PWM signal according to the display data to drive the OLED touch panel to display and The frame display data corresponds to the screen.

In order to enable the review committee to further understand the structure, characteristics and purpose of the present invention, drawings and detailed descriptions of preferred embodiments are attached as follows.

Please refer to FIG. 1 , which illustrates a block diagram of an embodiment of the driver chip of the present invention. As shown in FIG. 1 , a driving chip 100 includes an image detection module 110 , a noise detection module 111 , a brightness detection module 112 and a dimming module 120 to drive an OLED touch panel 130 to display images. , among which, the dimming module 120 has a mode selection unit 121, a grayscale reduction and brightness compensation 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 to avoid interference with touch detection. The driver includes: (1) 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 S _D ; and (2) when the detection result signal S _D represents a consistent state, the mode selection unit 121 is driven to output a first enabling signal EN1 to drive the gray scale reduction and brightness. The compensation 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 set of driving signals, thereby driving the OLED touch panel 130 to display the frame display data D _IN Corresponding to a picture; wherein, after receiving the first enabling signal EN1, the noise detection module 111 will detect a touch noise intensity _SI , and the grayscale reduction and brightness compensation unit 122 will enable the touch Under the condition that the noise intensity S _I is less than a threshold, the gray scale value of each display data D _IN is gradually reduced to generate a first output data respectively, and a brightness compensation operation is performed on the first output data to generate a PWM duty. Ratio, and generate output data D _OUT according to the first output data and the PWM duty cycle, and the driving unit 124 will generate the set of driving signals including a driving voltage and a PWM signal according to the output data D _OUT to drive the OLED touch The panel 130 displays a picture corresponding to the frame display data, wherein the brightness compensation operation is to adjust the PWM duty according to the difference between the brightness value S _I measured by the brightness detection module 112 and an ideal corresponding brightness value. Compare. That is, the present invention reduces the driving voltage to avoid interfering with touch detection, and the resulting brightness loss is compensated by increasing the PWM duty cycle.

In addition, when the detection result signal S _D represents a non-compliant state, the driving mode selection unit 121 outputs a second enable signal EN2 to drive the normal screen driving mode generating unit 123 to execute a normal screen driving mode according to each The display data D _IN generates an output data D _OUT to drive the driving unit 124 to generate a set of driving signals, thereby driving the OLED touch panel 130 to display a picture corresponding to the frame display data D _IN , wherein, in the normal picture driving mode , the normal picture driving mode generating unit 123 will directly generate the output data D OUT including a corresponding driving voltage value and a corresponding PWM duty cycle according to the gray scale value of each display data D _IN , and the driving unit 124 will generate the output data D _OUT according to the output data. D _OUT generates the set of driving signals including a driving voltage and a PWM signal to drive the OLED touch panel 130 to display a picture corresponding to the frame display data. That is, when no high-noise picture is detected, the present invention drives the OLED touch panel 130 to display the picture according to the original driving voltage value and PWM duty cycle. At this time, the operation of the picture display has a negative impact on the touch detection. Disturbance is minimal.

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 data of the stripe patterns 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, perform the following steps: detect a touch noise intensity; and gradually reduce the grayscale value of each display data to respectively Generate a first output data, perform a brightness compensation operation on each of the first output data to generate a PWM duty cycle, generate an output data based on the first output data and the PWM duty cycle, and based on the output The data generates a driving voltage and a PWM signal to drive a touch panel to display a picture corresponding to the frame display data. The brightness compensation operation is based on a brightness value measured by a brightness detection module and an ideal The difference between the corresponding brightness values adjusts the PWM duty cycle (step b).

In addition, when the detection result represents a non-compliant state, the driver chip directly generates a corresponding driving voltage and a corresponding PWM signal according to the display data to drive the touch panel display to correspond to the frame display data. This screen.

In addition, in the above steps, the high-noise picture detection operation may include detecting whether the frame display data includes data of multiple stripes patterns. In addition, 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 whether the stripes are greater than a second threshold; 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 that are independent of each other.

According to the above description, the present invention further discloses an OLED touch display. Please refer to FIG. 3 , which illustrates 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 , where the driver chip 220 is implemented by the driver chip 100 .

Through the design disclosed above, the present invention has the following advantages: 1. The display driving method of the present invention to avoid 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 to avoid 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 touch false alarm 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 touch false alarm points through the aforementioned method. 4. The OLED touch display of the present invention can use the aforementioned driver chip to improve the signal-to-noise ratio of the touch detection of the OLED touch panel and reduce the probability of touch false alarm points.

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 111:Noise detection module 112:Brightness detection module 120: Dimming module 121: Mode selection unit 122: Gray scale reduction and brightness compensation unit 123: Normal picture drive mode generation unit 124: Drive unit 130:OLED touch panel 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 consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce each display data under the condition that the touch noise intensity is less than a threshold. The grayscale values are used to generate a first output data respectively, a brightness compensation operation is performed on each of the first output data to generate a PWM duty cycle, and an output is generated according to the first output data and the PWM duty cycle. data, and generate a driving voltage and a PWM signal based on the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness detection module. The difference between a brightness value and an ideal corresponding brightness value adjusts the PWM duty cycle

FIG. 1 is a block diagram of an embodiment of the driver chip of the present invention. FIG. 2 is a flowchart 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 picture detection operation on a frame of display data to generate a detection result.

Step b: When the detection result represents a consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce each display under the condition that the touch noise intensity is less than a threshold. The grayscale value of the data is used to generate a first output data respectively, a brightness compensation operation is performed on each first output data to generate a PWM duty cycle, and a PWM duty cycle is generated according to the first output data and the PWM duty cycle. Output data, and generate a driving voltage and a PWM signal based on the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness detection module. The difference between a brightness value and an ideal corresponding brightness value adjusts the PWM duty cycle

Claims (15)

A display driving method that avoids interference with touch detection is implemented by a driver chip. 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. Generate a detection result; and when the detection result represents a consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce the touch noise intensity with the goal of making the touch noise intensity less than a threshold. The gray scale value of each display data is used to generate a first output data respectively, and a brightness compensation operation is performed on each first output data to generate a PWM duty cycle. According to the first output data and the PWM duty cycle Generate an output data, and generate a driving voltage and a PWM signal according to the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness detection module The difference between a measured brightness value and an ideal corresponding brightness value adjusts the PWM duty cycle; wherein the high-noise picture detection operation includes detecting whether the frame display data contains data of multiple stripe patterns. In the display driving method to avoid interference with touch detection as described in item 1 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. 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 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 3 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, the display driving method to avoid interference with touch detection is wherein, when the detection result represents a non-compliant state, the driving chip directly generates a corresponding corresponding display data according to the display data. The driving voltage and a corresponding PWM signal drive the touch panel to display the image corresponding to the frame display data. A driver chip is used to perform a display driving method to avoid interference with touch detection. 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 consistent state, perform the following steps: detect a touch noise intensity; and gradually reduce each step under the condition that the touch noise intensity is less than a threshold. The grayscale values of the display data are used to generate a first output data respectively, and a brightness compensation operation is performed on each of the first output data to generate a PWM duty cycle. According to the first output data and the PWM duty cycle Generate an output data, and generate a driving voltage and a PWM signal according to the output data to drive a touch panel to display a picture corresponding to the frame display data, wherein the brightness compensation operation is based on a brightness detection module The difference between a measured brightness value and an ideal corresponding brightness value adjusts the PWM duty cycle; wherein the high-noise picture detection operation includes detecting whether the frame display data contains data of multiple stripe patterns. In the driving chip described in claim 6 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. In the driver chip described in claim 7 of the patent application, the high-noise picture 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 8 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. Such as the driver chip described in item 6 of the patent application, wherein when the detection result represents a non-compliant state, the driver chip directly generates a corresponding driving voltage and a corresponding PWM signal according to the display data. To drive the touch panel to display the screen corresponding to the frame display data. An OLED touch display has an OLED touch panel and a driver chip used to drive the OLED touch panel. The driver chip is used to perform a display driving method to avoid interference with touch detection. The method includes: using An image detection module in the driver chip performs 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, the following steps are performed: Detection A touch noise intensity; and gradually reducing the gray scale value of each display data to generate a first output data respectively under the condition that the touch noise intensity is less than a threshold, and performing a step on each first output data. A brightness compensation operation to generate a PWM duty cycle, generate an output data based on the first output data and the PWM duty cycle, and generate a driving voltage and a PWM signal based on the output data to drive a touch panel Display a picture corresponding to the frame of display data, wherein the brightness compensation operation is to adjust the PWM duty cycle according to the difference between a brightness value measured by a brightness detection module and an ideal corresponding brightness value; wherein, The noisy picture detection operation includes detecting whether the display data of the frame includes data of multiple stripes patterns. For the OLED touch display described in claim 11 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 OLED touch display described in claim 12 of the patent application, the high-noise picture detection operation further includes determining whether the grayscale values of the stripe pattern data are greater than a second threshold. For the OLED touch display described in claim 13 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. For example, in the OLED touch display described in item 11 of the patent application, when the detection result represents a non-compliant state, the driving chip directly generates a corresponding driving voltage and a corresponding corresponding display data according to the display data. The PWM signal drives the OLED touch panel to display the image corresponding to the frame display data.

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