TWI795215B - Gamma comparison table storage method, display driver chip, display device and information processing device - Google Patents

Abstract

A gamma look-up table storage method is implemented by a control circuit to store 2 ^M groups of corresponding data of brightness values and gray scale values in a memory, wherein each brightness value is represented by N bits, Each gray scale value is represented by M bits, N and M are both positive integers greater than 1, and the method includes: using (2 ^m -1) memory cells of M bits of the memory to store ( 2 ^m -1) gray-scale boundary values, m is an integer greater than 1; use the 2 ^m m-bit memory cells of the memory to store the brightness of each group in the 2 ^m groups of 2 ^M brightness values The common high m bytes of the value, m being an integer greater than 1; and storing 2 ^M low (Nm) bytes of the luminance value using the memory unit of 2 ^M (Nm) bits of the memory.

Description

Gamma comparison table storage method, display driver chip, display device and information processing device

The present invention relates to a driving method of a display, in particular to a storage method of a gamma comparison table which can reduce storage space.

For a common display driver chip, a gamma curve is used to correct the input display data in the process of processing the input display data, so as to make the picture uniform and not distorted.

However, as the picture resolution becomes higher and higher, the amount of data brought by the gamma curve is also increasing, so that the display driver chip needs to increase the chip area to provide the corresponding storage space, thereby increasing the cost of the chip.

In order to solve the above problems, there is an urgent need in the art for a novel storage method for the gamma comparison table.

The main purpose of the present invention is to disclose a storage method of a gamma lookup table, which can divide the brightness range in a gamma lookup table into a plurality of groups, each of which has an exclusive common high byte value, so that when stored In the gamma comparison table, it is only necessary to store a plurality of the exclusive common high-byte values and the low-byte values of each brightness value, so that the required gamma can be reduced without losing the information corresponding to the grayscale brightness. storage space.

Another object of the present invention is to disclose a display driver chip, which can reduce the memory space required by a gamma lookup table without losing the information corresponding to the grayscale brightness by implementing the aforementioned gamma lookup table storage method .

Another object of the present invention is to disclose a display device, which can reduce the requirement of a gamma look-up table by using the above-mentioned gamma look-up table storage method to make its display drive chip without losing the information corresponding to the gray scale brightness. memory space.

Another object of the present invention is to disclose an information processing device, which can reduce the requirement of a gamma comparison table for a display device without losing the information corresponding to the grayscale brightness by using the above-mentioned storage method of the gamma comparison table. memory space.

In order to achieve the aforementioned purpose, a gamma comparison table storage method is proposed, which is implemented by a control circuit to store the corresponding data of 2 ^M groups of brightness values and gray scale values in a memory, wherein each of the brightness values The value is represented by N bits, and each gray scale value is represented by M bits, N and M are both positive integers greater than 1, and the method includes:

Using (2 ^m -1) M-bit memory cells of the memory to store (2 ^m -1) gray scale boundary values, m is an integer greater than 1;

Utilizing ^2m m-bit memory cells of the memory to store the common upper m-bytes of the luminance values in each of the ^2m groups of ^2M said luminance values, m being an integer greater than 1; and

^2M low (Nm) bytes of the luminance value are stored in the ^2M (Nm) bit memory cells of the memory.

In one embodiment, one of the brightness values corresponding to any one of the grayscale values is obtained by concatenating a corresponding common high m byte and a corresponding low (N-m) byte become.

In one embodiment, M is an integer greater than or equal to 8.

In one embodiment, the gray scale value is a display gray scale value of red light, blue light or green light.

To achieve the aforementioned purpose, the present invention further proposes a display driver chip, which has a control circuit to execute a gamma look-up table storage method to store the corresponding data of 2 ^M groups of brightness values and gray scale values in a memory, wherein , each of the brightness values is represented by N bits, each of the grayscale values is represented by M bits, and N and M are both positive integers greater than 1, and the method includes:

Using (2 ^m -1) M-bit memory cells of the memory to store (2 ^m -1) gray scale boundary values, m is an integer greater than 1;

Utilizing ^2m m-bit memory cells of the memory to store the common upper m-bytes of the luminance values in each of the ^2m groups of ^2M said luminance values, m being an integer greater than 1; and

^2M low (Nm) bytes of the luminance value are stored in the ^2M (Nm) bit memory cells of the memory.

In one embodiment, one of the brightness values corresponding to any one of the grayscale values is obtained by concatenating a corresponding common high m byte and a corresponding low (N-m) byte become.

In one embodiment, M is an integer greater than or equal to 8.

In one embodiment, the gray scale value is a display gray scale value of red light, blue light or green light.

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

In a possible embodiment, the display panel can be a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel or an organic light emitting diode display panel body display panel.

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 panel can be a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel or an organic light emitting diode display panel body display panel.

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

Please refer to FIG. 1 , which 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 panel 110 and a display driver circuit 120 for driving the display panel 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 1211 and a driving circuit 1212 . The number of display driver chips 121 is directly proportional to the size of the display panel 110 , that is, the larger the size of the display panel 110 , the more the number of display driver chips 121 . In addition, the display panel 110 can be a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode display panel or an organic light emitting diode display panel.

The control circuit 1211 has a function module 1211a to execute a gamma comparison table storage program to store the corresponding data of 2 ^M groups of brightness values and gray scale values in a memory 1211b, wherein the function module 1211a can be a For software or hardware functional modules, each brightness value is represented by N bits, and each gray scale value is represented by M bits, where N and M are both positive integers greater than 1, and the stored Programs include:

(1) Using (2 ^m −1) M-bit memory units of the memory 1211b to store (2 ^m −1) gray-scale boundary values, where m is an integer greater than 1;

(2) Utilize ^2m m-bit memory units of the memory 1211b to store the common high m-bytes of the luminance values in each of the ^2m groups of the ^2M brightness values, and m is an integer greater than 1 ;as well as

(3) Utilize the 2 ^M (Nm) bit memory units of the memory 1211b to store 2 ^M low (Nm) bytes of the luminance value.

According to the above arrangement, one of the brightness values corresponding to any one of the gray scale values can be decoded by hardware in the chip from one corresponding common high m byte group to one corresponding low (N-m) bytes are concatenated.

In addition, preferably, M is an integer greater than or equal to 8, such as 8, 9, 10 and so on.

In addition, the gray scale value may be a display gray scale value of red light, blue light or green light. In detail, assuming that M=8, N=10, and m=2, then the three 8-bit memory units of the memory 1211b store 3 gray-scale boundary values; the four 2-bit memory units store 256 grayscale boundary values. The common high 2 bytes of the brightness values in each of the 4 groups of the brightness values; and 256 8 (=10-2) bit memory cells store the lower 8 (=10-2) of the 256 brightness values 2) Bytes. Accordingly, the memory 1211b only needs 3*8+4*2+256*8 = 2080 bits of storage space to store the information of the gamma comparison table without losing the information corresponding to the grayscale brightness; Ground, the prior art requires 256*10 = 2560 bits of storage space. That is, in this example, the present invention can reduce the memory space by about 18.75%.

According to the above description, it can be seen that the present invention provides a storage method for the gamma comparison table. Please refer to Fig. 2, which depicts a flow chart of an embodiment of the gamma comparison table storage method of the present invention, which is implemented by a control circuit to store ^2M sets of corresponding data of brightness values and gray scale values, wherein each The brightness value is represented by N bits, each of the gray scale values is represented by M bits, and both N and M are positive integers greater than 1. As shown in Figure 2, the method includes: using (2 ^m -1) M-bit memory cells of a memory to store (2 ^m -1) gray-scale boundary values, m is an integer greater than 1 (step a ); Utilize the memory unit of ^2m m bits ^{of the memory to store the common high m bytes of the brightness values of each group in the 2m groups of the brightness values of 2 M ,} m is an integer greater than 1 ( Step b); and storing 2 ^M low (Nm) bytes of the luminance value using the 2 ^M (Nm) bit memory cells of the memory (step c).

In addition, one of the brightness values corresponding to any one of the grayscale values is formed by concatenating a corresponding common high-m byte group and a corresponding low (N-m) byte group.

In addition, preferably, M is an integer greater than or equal to 8, such as 8, 9, 10 and so on.

In addition, the gray scale value may be a display gray scale value of red light, blue light or green light.

Please refer to FIG. 3 , which shows a schematic diagram of an application example of the gamma comparison table storage method in FIG. 2 . As shown in Figure 3, the B (blue) distribution curve of the three distribution curves of R, G, and B brightness versus gray scale has three dividing points Bp0(x0, y0), Bp1(x1, y1), and Bp2(x2, y2), where x0, x1, and x2 are grayscale values, y0, y1, and y2 are brightness values, and the highest 2 bits of brightness values in the range [0, y0] are 00, and in the range of (y0, y1] The highest 2 bits of the brightness value in the range are 01, the highest 2 bits of the brightness value in the range of (y1, y2] are 10, and the highest 2 bits of the brightness value in the range of (y2, 1023] are 11. That is to say, for any brightness value in the range [0, y0], the brightness value can be represented without loss by splicing the highest 2-bit value of 00 with its lower 8-bit value; in (y0, y1 ] any brightness value in the range of (y1, y2] only needs to splicing the highest 2 bits of value 01 with its lower 8 bits to represent the brightness value without loss; any brightness value in the range of (y1, y2] Only the highest 2 bits with a value of 10 need to be spliced with the lower 8 bits to represent the brightness value without loss; The brightness value can be represented without loss by splicing the lower 8-bit value of 2 bits.

According to the above description, the present invention further provides an information processing device. Please refer to FIG. 4 , which shows a block diagram of an embodiment of an information processing device of the present invention. As shown in Figure 4, 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 gamma comparison table storage method of the present invention can divide the brightness range in a gamma comparison table into a plurality of groups, and each group has an exclusive common high byte value, so that when storing the gamma comparison table , only need to store a plurality of the exclusive common high byte value and the low byte value of each brightness value, so that the required storage space can be reduced without losing the information corresponding to the gray scale brightness.

2. The display driver chip of the present invention can reduce the memory space required by a gamma lookup table without losing the information corresponding to the gray scale brightness by implementing the aforementioned gamma lookup table storage method.

3. The display device of the present invention can reduce the memory space required for a gamma lookup table by using the above gamma lookup table storage method so that the display drive chip can reduce the information corresponding to the grayscale brightness.

4. The information processing device of the present invention can use the above gamma lookup table storage method to enable its display device to reduce the memory space required by a gamma lookup table without losing the information corresponding to the gray scale brightness.

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

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

100: display device 110: display panel 120: display drive circuit 121: display drive chip 1211: control circuit 1211a: functional module 1211b: memory 1212: drive circuit 200: information processing device 210: central processing unit 220: display device steps a: Use (2 ^m -1) M-bit memory cells of a memory to store (2 ^m -1) gray scale boundary values, m is an integer greater than 1. Step b: Utilize ^2m m-bit memory units of the memory to store the common high m-bytes of the brightness values of each group in the ^{2m groups of 2M brightness} values, m is an integer greater than 1 . Step c: Utilize the 2 ^M (Nm) bit memory cells of the memory to store 2 ^M low (Nm) bytes of the luminance value.

FIG. 1 shows a block diagram of an embodiment of a display device of the present invention. FIG. 2 is a flow chart of an embodiment of the storage method of the gamma comparison table of the present invention. FIG. 3 shows a schematic diagram of an application example of the storage method of the gamma comparison table in FIG. 2 . FIG. 4 is a block diagram of an embodiment of an information processing device of the present invention.

Step a: Utilize (2 ^m -1) M-bit memory cells of a memory to store (2 ^m -1) gray scale boundary values, m is an integer greater than 1

Step b: Utilize ^2m m-bit memory units of the memory to store the common high m-bytes of the brightness values of each group in the ^{2m groups of 2M brightness} values, m is an integer greater than 1

Step c: Utilize the memory unit of 2 ^M (Nm) bits of the memory to store 2 ^M low (Nm) bytes of the brightness value

Claims (13)

A gamma look-up table storage method is implemented by a control circuit to store 2 ^M groups of corresponding data of brightness values and gray scale values in a memory, wherein each brightness value is represented by N bits, Each gray scale value is represented by M bits, N and M are both positive integers greater than 1, and the method includes: using (2 ^m -1) memory cells of M bits of the memory to store ( 2 ^m -1) gray-scale boundary values, m is an integer greater than 1; use the 2 ^m m-bit memory cells of the memory to store the brightness of each group in the 2 ^m groups of 2 ^M brightness values The common high m bytes of the value, m being an integer greater than 1; and storing 2 ^M low (Nm) bytes of the luminance value using the memory unit of 2 ^M (Nm) bits of the memory. The gamma comparison table storage method as described in item 1 of the scope of the patent application, wherein, one of the brightness values corresponding to any one of the gray scale values is composed of a corresponding common high m byte group and a corresponding The lower (N-m) bytes are concatenated. The gamma comparison table storage method as described in item 1 of the scope of the patent application, wherein, M is an integer greater than or equal to 8. The gamma comparison table storage method described in claim 1 of the patent application, wherein the gray scale value is the display gray scale value of red light, blue light or green light. A display driver chip, having a control circuit to implement a gamma look-up table storage method to store 2 ^M sets of corresponding data of brightness values and gray scale values in a memory, wherein each brightness value is represented by N Bit representation, each gray scale value is represented by M bits, N and M are both positive integers greater than 1, and the method includes: using (2 ^m -1) M bits of the memory The memory unit stores (2 ^m -1) gray-scale boundary values, m is an integer greater than 1; each of the 2 ^m groups of 2 ^M brightness values is stored using the 2 ^m m-bit memory cells of the memory The common high m bytes ^of the brightness values of the group, m is an integer greater than 1; and the low (Nm) of the 2 ^M (Nm) bits of the memory are stored in the memory unit bytes. The display driver chip as described in item 5 of the scope of the patent application, wherein, one of the brightness values corresponding to any one of the grayscale values is composed of a corresponding common high-m byte group and a corresponding one of the The lower (N-m) bytes are concatenated. The display driver chip as described in claim 5 of the patent application, wherein M is an integer greater than or equal to 8. The display driver chip as described in item 5 of the scope of the patent application, wherein the gray scale value is the display gray scale value of red light, blue light or green light. A display device has a display panel 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 panel is displayed by a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, and a quantum dot light emitting diode display A display panel selected from the group consisting of the panel and an organic light emitting diode display panel. An information processing device has a central processing unit and a display device as 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 as described in item 11 of the scope of the patent application, wherein the display panel is composed of a liquid crystal display panel, a micro light emitting diode display panel, a mini light emitting diode display panel, a quantum dot light emitting diode A display panel selected from the group consisting of a body display panel and an organic light emitting diode display panel. 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 information processing device.

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