TWI792750B - Correction coefficient compression method for self-luminous display screen, display driver chip, display device and information processing device - Google Patents

Abstract

A correction coefficient compression method for a self-luminous display screen, which is implemented by a control circuit, including: Dividing a frame of pixel compensation data into K first blocks, where K is an integer greater than 1; for each of the first blocks The N pixel compensation data of the block are converted from a spatial domain to a spatial frequency domain to generate K second blocks each comprising N spatial frequency data, where N is a power of 2; according to a compression rate r, r is a positive real number not greater than 1, generating K*r representative blocks from K said second blocks, where K*r is a positive integer; and K mapping addresses stored in an extended comparison table respectively point to One of the K*r representative blocks is subjected to a spatial-frequency-to-spatial domain conversion to generate K third blocks each containing N correction data, so as to perform a self-luminous display according to Each frame input display data for compensation.

Description

Correction coefficient compression method for self-luminous display screen, display driver chip, display device and information processing device

The invention relates to the uniform display correction of self-luminous displays, in particular to a method for compressing correction coefficients of self-luminous display screens.

Self-luminous displays, such as OLED (Organic Light Emitting Diode) or LED (Light Emitting Diode) displays, it is difficult to ensure the consistency of the luminous efficiency of each display element in the production process. Therefore, it is necessary to display the full screen of each display element The data is compensated to ensure the picture quality.

The current practice is to correct each display element (lamp bead) one by one. However, as the size and resolution of the screen become higher and higher, more and more compensation data need to be stored and transmitted, resulting in an increasing memory space required in the display driver chip, and the cost increases accordingly.

In order to solve the above problems, there is an urgent need in the art for a novel uniform display correction method for self-luminous displays.

The main purpose of the present invention is to disclose a correction coefficient compression method for self-luminous display screens, which can reduce the data memory burden of large-size self-luminous displays by greatly reducing the storage capacity of calibration data.

Another object of the present invention is to disclose a display driver chip, which can greatly reduce the data memory burden of the chip by implementing the aforementioned calibration coefficient compression method.

Another object of the present invention is to disclose a display device, which can greatly reduce the storage capacity of display screen calibration data by using the above-mentioned display driver chip, so as to reduce the data memory burden when realizing a large-size display screen specification.

Another object of the present invention is to disclose an information processing device, which can greatly reduce the storage capacity of display calibration data by using the above-mentioned display driver chip, so as to reduce the data memory burden when providing large-size display specifications.

In order to achieve the aforementioned purpose, a correction coefficient compression method for self-illuminating display screens is proposed It is shown that it is realized by a control circuit and it includes: dividing a frame of pixel compensation data into K first blocks, K being an integer greater than 1; compensating the N pixels of each first block The data is converted from a space domain to a space frequency domain to generate K second blocks each containing N space frequency data, where N is a power of 2; according to a compression ratio r, r is a positive real number not greater than 1, Generate K*r representative blocks from the K second blocks, K*r is a positive integer; and K mapping addresses stored in an extended comparison table point to the K*r representative blocks respectively one of the blocks and perform a spatial frequency-to-spatial domain conversion on it to generate K third blocks each containing N correction data to compensate the input display data for each frame of a self-luminous display .

In one embodiment, the spatial domain to spatial frequency domain transform is a discrete cosine transform.

In one embodiment, the spatial frequency domain to spatial domain transform is an inverse discrete cosine transform.

In one embodiment, K*r addresses among the K mapping addresses correspond to the K*r representative blocks in a one-to-one manner, and the other addresses among the K mapping addresses The K*(1-r) addresses are each identical to one of the K*r addresses.

To achieve the aforementioned purpose, the present invention further proposes a display driver chip, which has a control circuit to perform a correction coefficient compression method for a self-luminous display screen, the method comprising: dividing a frame of pixel compensation data into K first blocks, K is an integer greater than 1; performing a spatial domain to spatial frequency domain conversion on the N pixel compensation data of each of the first blocks to generate K second blocks each comprising N spatial frequency data, N is a power of 2; according to a compression ratio r, where r is a positive real number not greater than 1, K*r representative blocks are generated from the K second blocks, and K*r is a positive integer; and The K mapping addresses stored in an extended look-up table are respectively directed to one of the K*r representative blocks, and a space-frequency-domain to space-domain conversion is performed on it to generate K corrections each containing N The third block of data, so as to supplement the display data of each frame of a self-luminous display compensate.

In one embodiment, the spatial domain to spatial frequency domain transform is a discrete cosine transform.

In one embodiment, the spatial frequency domain to spatial domain transform is an inverse discrete cosine transform.

In one embodiment, K*r addresses among the K mapping addresses correspond to the K*r representative blocks in a one-to-one manner, and the other addresses among the K mapping addresses The K*(1-r) addresses are each identical to one of the K*r addresses.

To achieve the aforementioned purpose, the present invention further provides a display device, which has a display module and at least one display driver chip as mentioned above.

In a possible embodiment, the display module can be a micro light emitting diode display module, a mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode Display mods.

To achieve the aforementioned purpose, the present invention further proposes an information processing device, which has a central processing unit and the aforementioned display device, wherein the central processing unit is used to communicate with the display device.

In a possible embodiment, the display module can be a micro light emitting diode display module, a mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode Display mods.

In a possible embodiment, the information processing device may be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an advertising billboard.

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

100: display device

110: Display module

120: Display drive circuit

121: Display driver chip

121a: control circuit

121b: drive circuit

200: information processing device

210: central processing unit

220: display device

Step a: divide one frame of pixel compensation data into K first blocks, K is an integer greater than 1

Step b: performing a spatial-to-spatial-frequency domain conversion on the N pixel compensation data of each of the first blocks to generate K second blocks each comprising N spatial frequency data, where N is 2 Power

Step c: According to a compression ratio r, r is a positive real number not greater than 1, generating K*r representative blocks from the K second blocks, and K*r is a positive integer

Step d: According to the K mapping addresses stored in an extended comparison table, point to one of the K*r representative blocks respectively, and perform a spatial frequency domain to spatial domain conversion on it to generate K each containing The third block of N correction data, so as to compensate the input display data of each frame of a self-luminous display

FIG. 1 is a block diagram of an embodiment of a display device of the present invention.

FIG. 2 is a flow chart of an embodiment of a correction coefficient compression method for a self-luminous display screen of the present invention.

FIG. 3 is a block diagram of an embodiment of an information processing device of the present invention.

Please refer to FIG. 1 , which is a block diagram of an embodiment of a display device of the present invention. As shown in Figure 1, a display device 100 has a display module 110 and a display driver circuit 120 for driving the display module 110, wherein the display driver circuit 120 has at least one display driver chip 121, and the display driver chip 121 has a control circuit 121a and a driving circuit 121b. The number of display driver chips 121 is directly proportional to the size of the display module 110 , that is, the larger the size of the display module 110 , the more the number of display driver chips 121 . In addition, the display module 110 can be a liquid crystal display module, a micro light emitting diode display module, a mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode display module body display module.

The control circuit 121a is used to control the operation of the drive circuit 121b so that the display module 110 displays a picture, and it has a function module to perform a calibration coefficient compression program, which includes: (1) will target the display module 110 A pre-measured frame of pixel compensation data is divided into K first blocks, K is an integer greater than 1; (2) performing a space-to-space Frequency domain conversion to generate K second blocks each comprising N spatial frequency data, N being a power of 2; (3) According to a compression rate r, r is a positive real number not greater than 1, for K all The second block executes a quantity compression program to generate K*r representative blocks, K*r is a positive integer; and (4) K mapping addresses stored in an extended comparison table point to K*r respectively One of the representative blocks is converted from the spatial frequency domain to the spatial domain to generate K third blocks each containing N correction data, so as to input to each frame of the display module 110 Display data for compensation.

In detail, the quantity compression procedure may be to select K*r representative blocks from the K second blocks; or perform a grouping iterative procedure to generate K*r from the K second blocks Represents a block. The grouping iterative procedure regards the K second blocks as K original distribution points on a plane, which includes an initial step and a loop procedure, wherein the initial step is based on K*r predetermined Set a point to carry out a shortest distance judgment procedure on the K described original distribution points to divide the K described original distribution points into K*r a first group, and calculate a centroid coordinate in each of the first groups to generate K*r centroid points; and the loop procedure includes repeatedly performing the following steps: with K*r centroid points Updating the K*r preset points, performing the shortest distance judgment procedure on the K original distribution points according to the K*r preset points, so as to divide the K original distribution points into K*r second groups, and calculate a centroid coordinate in each second group to generate K*r centroid points. The K*r centroid points generated after the loop program is executed are the K*r representative blocks. In addition, the N pieces of the spatial frequency data of each centroid point are an average value or a position-weighted average value of the spatial frequency data of a plurality of the original distribution points in the second group.

In addition, among the K mapping addresses stored in the extended comparison table, K*r addresses are respectively pointing to one of the K*r representative blocks in a one-to-one manner, and the K The other K*(1-r) addresses in the mapping addresses are each identical to one of the K*r addresses. Accordingly, the spatial frequency domain to spatial domain conversion can be performed on the N spatial frequency data of a specified representative block according to each address stored in the extended comparison table, thereby generating K each containing The third block of the N correction data is used to compensate the input display data of each frame of the display module 110 .

In addition, the display module 110 can be a liquid crystal display module, a micro light emitting diode display module, a mini light emitting diode display module, a quantum dot light emitting diode display module or an organic light emitting diode display module body display module.

In addition, the space-to-space-frequency domain conversion may be a discrete cosine transform (DCT), and the space-frequency-to-space domain conversion may be an inverse discrete cosine transform (IDCT).

For example, assuming that the size of the first block is 8*8, a display area with a screen size of 1080*2240 can be divided into 135*280=37800 blocks; discrete cosine is performed on each of the first blocks The conversion can change a frame of pixel compensation data from the first block (8*8 in size) in the spatial domain to the second block (8*8 in size) in the spatial frequency domain, where 64 Each of the second blocks of the spatial frequency domain data is regarded as a 64-dimensional point; the number of 64-dimensional points to be stored is selected according to the compression rate r, for example, if r=1, no compression is performed, Then save all the 37800 64-dimensional data, if r=1/2, then 18900 points will be generated from 37800 points, if r=1/4, then 9450 points will be generated from 37800 points.

According to the above description, it can be seen that the present invention proposes a correction coefficient compression method for a self-luminous display screen. Please refer to FIG. 2 , which shows a flow chart of an embodiment of a correction coefficient compression method for a self-luminous display screen of the present invention, which is implemented by a control circuit. As shown in Figure 2, the method includes: dividing a frame of pixel compensation data into K first blocks, K being an integer greater than 1 (step a); The compensation data is transformed from a spatial domain to a spatial frequency domain to generate K second blocks each comprising N spatial frequency data, where N is a power of 2 (step b); according to a compression ratio r, r is not greater than A positive real number of 1, generating K*r representative blocks from K said second blocks, where K*r is a positive integer (step c); and K mapping addresses stored in an extended comparison table respectively pointing to one of the K*r representative blocks and performing a spatial-frequency-to-spatial-domain conversion on it to generate K third blocks each containing N correction data, whereby a self-luminous Compensation is performed by inputting display data for each frame of the display (step d).

In addition, in step b, the transformation from the spatial domain to the spatial frequency domain is a discrete cosine transformation.

In addition, in step d, among the K mapped addresses, K*r addresses correspond to the K*r representative blocks in a one-to-one manner, and among the K mapped addresses Each of the other K*(1-r) addresses is the same as one of the K*r addresses, and the conversion from the spatial frequency domain to the spatial domain is an inverse discrete cosine transform.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 3 , which shows a block diagram of an embodiment of an information processing device of the present invention. As shown in Figure 3, an information processing device 200 has a central processing unit 210 and a display device 220, wherein the display device 220 is realized by the display device 100 shown in Figure 1, and the central processing unit 210 is used to communicate with the display device The device 220 communicates. In addition, the information processing device 200 can be a smart phone, a portable computer, a vehicle computer, a wearable electronic device or an advertising billboard.

With the design disclosed above, the present invention has the following advantages:

1. The correction coefficient compression method of the self-luminous display screen of the present invention can reduce the data storage burden of the large-size self-luminous display by greatly reducing the storage capacity of the calibration data.

2. The display driver chip of the present invention can greatly reduce the data memory burden of the chip by implementing the aforementioned calibration coefficient compression method.

3. The display device of the present invention can greatly reduce the storage capacity of display screen correction data by using the above-mentioned display driver chip, so as to reduce the data memory burden when realizing a large-size display screen specification.

4. The information processing device of the present invention can greatly reduce the storage capacity of display screen calibration data by using the above-mentioned display driver chip, so as to reduce the data memory burden when providing a large-size display screen specification.

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.

Step a: divide one frame of pixel compensation data into K first blocks, K is an integer greater than 1

Step b: performing a spatial-to-spatial-frequency domain conversion on the N pixel compensation data of each of the first blocks to generate K second blocks each comprising N spatial frequency data, where N is 2 Power

Step c: According to a compression ratio r, r is a positive real number not greater than 1, generating K*r representative blocks from the K second blocks, and K*r is a positive integer

Step d: According to the K mapping addresses stored in an extended comparison table, point to one of the K*r representative blocks respectively, and perform a spatial frequency domain to spatial domain conversion on it to generate K each containing The third block of N correction data, so as to compensate the input display data of each frame of a self-luminous display

Claims (13)

A correction coefficient compression method for a self-luminous display screen, which is realized by a control circuit, including: Dividing a frame of pixel compensation data into K first blocks, where K is an integer greater than 1; performing a spatial-to-spatial-frequency domain conversion on the N pixel compensation data of each of the first blocks to generate K second blocks each containing N spatial frequency data, where N is a power of 2 ; According to a compression rate r, where r is a positive real number not greater than 1, K*r representative blocks are generated from the K second blocks, and K*r is a positive integer; and The K mapping addresses stored in an extended look-up table are respectively directed to one of the K*r representative blocks, and a space-frequency-domain to space-domain conversion is performed on it to generate K corrections each containing N The third block of data is used to compensate the input display data of each frame of a self-luminous display. The correction coefficient compression method for a self-luminous display screen as described in item 1 of the scope of the patent application, wherein the transformation from the space domain to the space frequency domain is a discrete cosine transform. The correction coefficient compression method for a self-luminous display screen as described in item 2 of the scope of the patent application, wherein the transformation from the spatial frequency domain to the spatial domain is an inverse discrete cosine transformation. The correction coefficient compression method for a self-luminous display screen as described in item 1 of the scope of patent application, wherein, among the K mapping addresses, there are K*r addresses corresponding to the K*r addresses in a one-to-one manner The above representative block, and the other K*(1-r) addresses in the K mapping addresses are the same as one of the K*r addresses. A display driver chip has a control circuit to perform a correction coefficient compression method for a self-luminous display screen, the method comprising: Dividing a frame of pixel compensation data into K first blocks, where K is an integer greater than 1; performing a spatial-to-spatial-frequency domain conversion on the N pixel compensation data of each of the first blocks to generate K second blocks each containing N spatial frequency data, where N is a power of 2 ; According to a compression rate r, where r is a positive real number not greater than 1, K*r representative blocks are generated from the K second blocks, and K*r is a positive integer; and The K mapping addresses stored in an extended look-up table are respectively directed to one of the K*r representative blocks, and a space-frequency-domain to space-domain conversion is performed on it to generate K corrections each containing N The third block of data is used to compensate the input display data of each frame of a self-luminous display. The display driver chip as described in item 5 of the scope of the patent application, wherein the transformation from the spatial domain to the spatial frequency domain is a discrete cosine transformation. The display driver chip as described in item 6 of the scope of the patent application, wherein the transformation from the spatial frequency domain to the spatial domain is an inverse discrete cosine transformation. The display driver chip as described in item 5 of the scope of the patent application, wherein K*r addresses among the K mapped addresses correspond to the K*r representative blocks in a one-to-one manner, and The other K*(1-r) addresses among the K mapped addresses are each identical to one of the K*r addresses. A display device has a display module and at least one display driver chip as described in any one of items 5 to 8 of the patent application scope. The display device as described in item 9 of the scope of the patent application, wherein the display module is composed of a micro-light-emitting diode display module, a mini-light-emitting diode display module, and a quantum dot light-emitting diode display module A display module selected as a group formed with an organic light emitting diode display module. An information processing device has a central processing unit and the display device described in claim 9 of the scope of the patent application, wherein the central processing unit is used to communicate with the display device. The information processing device described in item 11 of the scope of the patent application, wherein the display module is composed of a micro-light-emitting diode display module, a mini-light-emitting diode display module, and a quantum dot light-emitting diode display A display module selected from the group formed by the module and an organic light emitting diode display module. The information processing device described in item 11 of the scope of the patent application is one selected from the group consisting of a smart phone, a portable computer, a vehicle-mounted computer, a wearable electronic device and an advertising billboard device.

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