TWI831291B - Brightness and color shift compensation method, display driver chip and information processing device - Google Patents

Abstract

A brightness and color shift compensation method is implemented by a control circuit. The method includes: receiving a frame of image data, which has a plurality of pixel data; adding a brightness compensation value to each pixel data to generate a first an output pixel data; and multiplying the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage; wherein, the control circuit has a memory to store the frame image data The brightness compensation value corresponds to one frame, and the control circuit reads a corresponding block among a plurality of blocks of the brightness compensation value of the frame from the memory according to the pixel position of the pixel data, Map a gain lookup table according to the brightness compensation average value of the corresponding block to find two adjacent binding points, and perform an interpolation operation based on the brightness compensation average value and the two adjacent binding points to The gain is generated, wherein the gain lookup table has a plurality of binding points, and each binding point includes a corresponding one of the brightness compensation average values and one of the gains.

Description

Brightness and color shift compensation method, display driver chip and information processing device

The present invention relates to a compensation method for a display, and in particular to a brightness and color shift compensation method for a self-luminous display.

The current demura (removing uneven brightness) algorithm uses a high-resolution industrial camera to capture the red, green, and blue images of a self-luminous display or the white (red, green, and blue sub-pixels light up at the same time) images. After the image data is processed by the software, it can generate two-dimensional matrix brightness data corresponding to the pixel position. The two-dimensional matrix brightness data can be used to generate a frame of brightness compensation parameters to correct the input image data of a frame, thereby compensating for the automatic The defect of mura (uneven brightness) in light-emitting displays.

However, since various self-luminous display manufacturers, such as OLED panel factories, have differences in their panel manufacturing technology and process capabilities, OLED panels from different brands, or even different batches of the same brand, will have different mura conditions. . Therefore, fixing a demura compensation algorithm cannot solve the mura problem of OLED panels of different brands and batches. In addition, the demura compensation algorithm cannot solve the color shift problem of OLED panels.

In order to solve the above problems, a novel self-luminous display compensation method is urgently needed in this field.

The main purpose of the present invention is to disclose a brightness and color deviation compensation method, which can provide a brightness compensation parameter and a color deviation compensation parameter through a frame of updateable brightness compensation value and a gain lookup table to correct a frame of input image data. , thereby compensating for the uneven display of a self-luminous display.

Another object of the present invention is to disclose a display driver chip that can use the above-mentioned brightness and color shift compensation method, so that the display driver chip only needs to receive and store one frame of updateable brightness compensation value and a gain lookup table. It can compensate for the uneven display picture of a self-luminous display, so that the display driver chip can be applied to various types of self-luminous displays or self-luminous displays of different batch numbers.

Another object of the present invention is to disclose an information processing device that can use the above-mentioned display driver chip to compensate for uneven display images for self-luminous displays of different models or self-luminous displays of different batch numbers.

In order to achieve the aforementioned purpose, a brightness and color shift compensation method is proposed, which is implemented by a control circuit. The method includes: Receive a frame of image data, which contains multiple pixel data; Add a brightness compensation value to each of the pixel data to generate a first output pixel data; and Multiplying the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage; Wherein, the control circuit has a memory to store the brightness compensation value of a frame corresponding to the frame of image data, and the control circuit reads the frame's brightness compensation value from the memory according to the pixel position of the pixel data. A corresponding block among the plurality of blocks of brightness compensation values is mapped to a gain lookup table according to the brightness compensation average value of the corresponding block to find two adjacent binding points, and according to the brightness compensation average value and the two adjacent binding points to perform an interpolation operation to generate the gain, wherein the gain lookup table has a plurality of the binding points, and each of the binding points includes a corresponding one The brightness compensation average value and a gain.

In one embodiment, the memory system is a static random access memory.

In one embodiment, the brightness compensation value of the frame is transmitted to the control circuit from an application processor.

In one embodiment, the brightness compensation value of the frame is obtained by performing a brightness compensation operation on at least one image captured by a camera on at least one test frame of a display screen.

In order to achieve the aforementioned object, the present invention further proposes a display driver chip, which has a receiving unit, an adding unit, a multiplication unit and a gain generating unit to perform a brightness and color shift compensation method. The method includes: The receiving unit is used to receive a frame of image data, the frame of image data having multiple pixel data; Using the adding unit to add a brightness compensation value to each pixel data to generate a first output pixel data; and The multiplication unit is used to multiply the first output pixel data by a gain to generate a second output pixel data to thereby generate a pixel driving voltage; Wherein, the receiving unit has a memory to store the brightness compensation value of a frame corresponding to the frame of image data, and the gain generating unit reads the frame from the memory according to the pixel position of the pixel data. A corresponding block among the plurality of blocks of brightness compensation values is mapped to a gain lookup table according to the brightness compensation average of the corresponding block to find two adjacent binding points, and according to the brightness compensation average The value and the two adjacent binding points perform an interpolation operation to generate the gain, wherein the gain lookup table has a plurality of the binding points, and each of the binding points includes a corresponding one The brightness compensation average value and a gain.

In one embodiment, the memory system is a static random access memory.

In one embodiment, the brightness compensation value of the frame is transmitted to the receiving unit from an application processor.

In one embodiment, the brightness compensation value of the frame is obtained by performing a brightness compensation operation on at least one image captured by a camera on at least one test frame of a display screen.

In order to achieve the above object, the present invention further proposes an information processing device, which has a display, wherein the display has the aforementioned display driver chip.

In possible embodiments, the display may be a micro-LED display, a sub-millimeter LED display, a quantum dot LED display or an organic LED display.

In possible embodiments, the information processing device may be a smart phone, a smart watch, a smart bracelet, a tablet computer, a notebook computer or a car computer.

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 a display driver chip of the present invention. As shown in FIG. 1 , a display driving chip 100 has a receiving unit 101 , an adding unit 102 , a gain generating unit 103 , a multiplying unit 104 and a driving voltage generating circuit 105 to serve as a self-luminous display module (not shown in In Figure 1) executes a brightness and color shift compensation program, which includes: (1) Using the receiving unit 101 to receive a frame of image data from an application processor 110, the frame of image data having a plurality of pixel data D _IN ; (2) ) use the addition unit 102 to add a brightness compensation value D _OFFSET to each pixel data D _IN to generate a first output pixel data D _O1 ; and (3) use the multiplication unit 104 to multiply the first output pixel data D _O1 A gain G is used to generate a second output pixel data D _O2 so that the driving voltage generating circuit 105 generates a pixel driving voltage V _GAMMA to drive a self-luminous display module, wherein the gain G is used to compensate for the self-luminous display The color cast defect of the module.

Specifically, the receiving unit 101 has a memory (not shown in Figure 1) to store a frame brightness compensation value D _OFFSET corresponding to the frame of image data, and the gain generating unit 103 is based on the pixel of a pixel data D _IN A corresponding block among the blocks of the brightness compensation value D _OFFSET of the frame is read from the memory, and a gain lookup table is mapped according to the brightness compensation average value of the corresponding block (not shown in the figure) 1) to find two adjacent binding points, and perform an interpolation operation based on the brightness compensation average and the two adjacent binding points to generate the gain G, where the gain lookup table There are a plurality of binding points, and each binding point includes a corresponding one of the brightness compensation average values and a gain G. Please refer to Figure 2, which is a schematic diagram of multiple binding points of the gain lookup table, in which the vertical axis is the gain and the horizontal axis is the brightness compensation average value. For the brightness compensation average value that does not correspond to the binding point For example, the corresponding gain can be determined by linear interpolation of one of two adjacent binding points.

In addition, the memory may be a static random access memory; the brightness compensation value D _OFFSET of the frame may be transmitted to the receiving unit 101 from the application processor 110 .

In addition, the brightness compensation value D _OFFSET of the frame is obtained by performing a brightness compensation calculation on at least one image collected by a camera from at least one test frame of a display screen of the self-luminous display module.

According to the above description, the present invention proposes a brightness and color shift compensation method. Please refer to FIG. 3 , which illustrates a flow chart of an embodiment of the brightness and color shift compensation method of the present invention, which is implemented by a control circuit. As shown in Figure 3, the brightness and color shift compensation method includes: receiving a frame of image data, which has multiple pixel data (step a); adding a brightness compensation value to each pixel data to generate a first an output pixel data (step b); and multiplying the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage accordingly (step c).

In the above steps, the control circuit has a memory to store the brightness compensation value of a frame corresponding to the frame of image data, and the control circuit reads out the brightness compensation value from the memory according to the pixel position of the pixel data. A corresponding block among the plurality of blocks of brightness compensation values in the frame is mapped to a gain lookup table according to the brightness compensation average value of the corresponding block to find two adjacent binding points, and according to the brightness The compensated average value and the two adjacent binding points perform an interpolation operation to generate the gain, wherein the gain lookup table has a plurality of the binding points, and each of the binding points includes a corresponding one of the brightness compensation average value and the gain; the memory can be a static random access memory; the brightness compensation value of the frame can be transmitted to the control circuit by an application processor; and the frame of The brightness compensation value may be obtained by performing a brightness compensation operation on at least one image captured by a camera on at least one test frame of a display screen.

In addition, according to the above description, the present invention further provides an information processing device. Please refer to FIG. 4 , which illustrates a block diagram of an embodiment of the information processing device of the present invention. As shown in FIG. 4 , an information processing device 200 has a display 210 . The display 210 has a pixel array 211 and a display driver chip 212 for driving the pixel array 211 . The display driver chip 212 is composed of the display driver chip 100 Realize. In addition, the display 210 can be a micro-LED display, a sub-millimeter LED display, a quantum dot LED display or an organic light-emitting diode display, and the information processing device 200 can be a smart phone. , a smart watch, a smart bracelet, a tablet, a laptop or a car computer.

Through the design disclosed above, the present invention has the following advantages: 1. The brightness and color deviation compensation method of the present invention can provide a brightness compensation parameter and a color deviation compensation parameter through a frame of updateable brightness compensation value and a gain lookup table respectively to correct a frame of input image data, thereby compensating for a self-inflicted image. The phenomenon of uneven display of light-emitting displays. 2. The display driver chip of the present invention can use the above-mentioned brightness and color shift compensation method, so that the display driver chip only needs to receive and store one frame of updateable brightness compensation value and a gain lookup table to compensate for a self-luminous display. Therefore, the display driver chip can be applied to various types of self-luminous displays or different batch numbers of self-luminous displays. 3. The information processing device of the present invention can use the above-mentioned display driver chip to compensate for uneven display images of self-luminous displays of different models or self-luminous displays of different batch numbers.

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: Display driver chip 101: Receiving unit 102: Addition unit 103: Gain generation unit 104: Multiplication unit 105: Driving voltage generation circuit 200: Information processing device 210: Monitor 211: Pixel array 212: Display driver chip Step a: Receive a frame of image data, which contains multiple pixel data. Step b: Add a brightness compensation value to each pixel data to generate a first output pixel data. Step c: Multiply the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage accordingly.

FIG. 1 is a block diagram of an embodiment of a display driver chip of the present invention. FIG. 2 is a schematic diagram showing a plurality of binding points of a gain lookup table of the driver chip of FIG. 1 . FIG. 3 illustrates a flow chart of an embodiment of the brightness and color shift compensation method of the present invention. FIG. 4 is a block diagram of an embodiment of the information processing device of the present invention.

Step a: Receive a frame of image data, which contains multiple pixel data. Step b: Add a brightness compensation value to each pixel data to generate a first output pixel data. Step c: Multiply the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage accordingly.

Claims (7)

A brightness and color shift compensation method is implemented by a control circuit. The method includes: receiving a frame of image data, which has a plurality of pixel data; adding a brightness compensation value to each pixel data to generate a first an output pixel data; and multiplying the first output pixel data by a gain to generate a second output pixel data to generate a pixel driving voltage; wherein, the control circuit has a memory to store the frame image data The brightness compensation value corresponding to a frame is obtained by performing a brightness compensation operation on at least one image collected by a camera on at least one test frame of a display screen, and the brightness compensation value of the frame is The brightness compensation value is transmitted to the control circuit from an application processor, and the control circuit reads out one of the plurality of blocks of the brightness compensation value of the frame from the memory according to the pixel position of the pixel data. A corresponding block is mapped to a gain lookup table according to the brightness compensation average value of the corresponding block to find two adjacent binding points, and the process is performed based on the brightness compensation average value and the two adjacent binding points. An interpolation operation is performed to generate the gain, wherein the gain lookup table has a plurality of binding points, and each binding point includes a corresponding one of the brightness compensation average values and one of the gains. For the brightness and color shift compensation method described in item 1 of the patent application, the memory system is a static random access memory. A display driver chip has a receiving unit, an adding unit, a multiplication unit and a gain generating unit to perform a brightness and color shift compensation method. The method includes: using the receiving unit to receive a frame of image data, and the frame of image data With multiple pixel data; The adding unit is used to add a brightness compensation value to each pixel data to generate a first output pixel data; and the multiplication unit is used to multiply the first output pixel data by a gain to generate a second output pixel data according to To generate a pixel driving voltage; wherein, the receiving unit has a memory to store the brightness compensation value of a frame corresponding to the frame of image data, and the brightness compensation value of the frame is obtained by comparing a camera to a display screen. At least one image captured by at least one test frame is obtained by performing a brightness compensation operation. The brightness compensation value of the frame is transmitted to the receiving unit from an application processor, and the gain generation unit is based on one of the pixel data. At the pixel position, a corresponding block among the blocks of the brightness compensation value of the frame is read from the memory, and a gain lookup table is mapped according to the brightness compensation average value of the corresponding block to find two adjacent binding points, and perform an interpolation operation based on the brightness compensation average and the two adjacent binding points to generate the gain, wherein the gain lookup table has a plurality of the binding points, And each of the binding points includes a corresponding one of the brightness compensation average value and a gain. For the display driver chip described in item 3 of the patent application, the memory system is a static random access memory. An information processing device has a display, wherein the display has a display driver chip as described in any one of items 3 to 4 of the patent application. Such as the information processing device described in item 5 of the patent application scope, wherein the display is composed of a micro-light-emitting diode display, a sub-millimeter light-emitting diode display, a quantum dot light-emitting diode display and an organic light-emitting diode display. A display selected to form the group. For example, the information processing device described in item 5 of the patent application scope is composed of a smart phone, a smart watch, a smart bracelet, a tablet computer, a notebook computer and a car computer. An electronic device of choice.

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