# US 10,482,844 B2 · Method to improve display performance at edges of circular display screen

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- Number: US 10,482,844 B2
- Document ID: US10482844B2
- Status: Granted
- Kind: B2
- Application number: 15/709,906
- Filed: 2017-09-20
- Published: 2018-01-11
- Granted: 2019-11-19
- Earliest claimed: 2017-06-30
- Assignees: Shanghai Tianma Am-Oled Co., Ltd.
- Applicants: Shanghai Tianma AM-OLED Co., Ltd.
- Inventors: Fangyun Lin; Hongling Wang; Zhiyong Xiong; Bojia Lv; Bozhang Sun
- Web page: https://patentgrep.com/patent/US10482844B2

## CPC

- G09G 5/10: Intensity circuits
- G09G 2300/0421: Structural details of the set of electrodes
- G09G 2310/0232: Special driving of display border areas
- G09G 2320/0686: with two or more screen areas displaying information with different brightness or colours
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)

## Abstract

A method to improve display performance at edges of a circular display screen is provided. The method comprises determining an edge area and a central area of the circular display screen, the edge area surrounding the central area; along a direction from a geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into n display regions each having a different luminance-level, where n is a positive integer larger than 1; and according to luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting the luminance of the pixels in each of the n display regions to corresponding target luminance. Along the direction from the geometric center to the edge area of the circular display screen, the corresponding target luminance of the pixels in the n display regions sequentially decreases.

## Claims

### Claim 1

A method for improving display performance at edges of a circular display screen, comprising:
determining an edge area and a central area of the circular display screen, the edge area surrouding the central area;
along a direction from a geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into n display regions each having a different luminance-level, where n is a positive integer larger than 1; and
according to luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting luminance of pixels in each of the n display regions to corresponding target luminance, wherein:
the pixels in each of the n display regions have different corresponding target luminance,
the pixels in a same display region have same corresponding target luminance, and
along the direction from the geometric center to the edge area of the circular display screen, the corresponding target luminance of each of the pixels in different display regions sequentially decreases and ratios between the corresponding target luminance of the pixels in the n display regions and the luminance of the pixels in the central area form an arithmetic sequence, and the arithmetic sequence has a common ratio of approximately ½.

### Claim 2 (depends on 1)

The method according to claim 1, wherein along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into the n display regions each having the different luminance-level further includes:
determining n circles each having a center point as the geometric center of the circular display screen, wherein the n circles includes a first circle . . . , an (n−1)-th circle, and an n-th circle; and
determining the n display regions each having the different luminance-level.

### Claim 3 (depends on 2)

The method according to claim 2, wherein determining the n circles each having the center point as the geometric center of the circular display screen further includes:
determining at least one first pixel which has a furthest distance from a center of the at least one first pixel to the geometric center of the circular display screen;
determining the n-th circle which has the center point as the geometric center of the circular display screen and crosses the at least one first pixel; and
based on a radius of the determined n-th circle, determining the (n−1)-th circle to the first circle in accordance with a rule that a radius of the (n−1)-th circle to the first circle is sequentially decreased by a preset luminance-decreasing radius k.

### Claim 4 (depends on 3)

The method according to claim 3, wherein:
the preset luminance-decreasing radius k is configured to be approximately 0.1 to 0.4 of a pixel size.

### Claim 5 (depends on 2)

The method according to claim 2, wherein determining the n display regions each having the different luminance-level further includes:
determining a first pixel group including a plurality of pixels in which a center of each pixel is crossed by an i-th circle, where i is a positive integer, 1≤i≤n;
determining a second pixel group disposed between the i-th circle and a (i−1)-th circle and formed by at least one A pixel, in which in a direction from a center of the at least one A pixel to the geometric center of the circular display screen, a distance from the center of the at least one A pixel to a circumference of the (i−1)-th circle is smaller than a distance from the center of the at least one A pixel to a circumference of the i-th circle; and
determining a third pixel group disposed between the i-th circle and a (i+1)-th circle and formed by at least one B pixel, in which in a direction from a center of the at least one B pixel to the geometric center of the circular display screen, a distance from the center of the at least one B pixel to the circumference of the i-th circle is smaller than a distance from the center of the at least one B pixel to a circumference of the (i+1)-th circle.

### Claim 6 (depends on 5)

The method according to claim 5, wherein determining the n display regions each having the different luminance-level further includes:
when i=n, determining a region including all pixels in the first and second pixel groups to be a display region with an n-th luminance-level;
when i∈[2, n−1], determining a region including all pixels in the first, second and third pixel groups to be a display region with an i-th luminance-level; and
when i=1, determining a region including all pixels in the first and third pixel groups to be a display region with a first luminance level.

### Claim 7 (depends on 1)

The method according to claim 1, wherein according to the luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting the luminance of the pixels in each of the n display regions to the corresponding target luminance further includes:
determining a relationship between a preset luminance-level and a luminance ratio for each of the n display regions, wherein the luminance ratio is a ratio between the corresponding target luminance of the pixels in each of the n display regions and the luminance of the pixels in the central area;
according to the luminance-level of each of the n display regions, as well as, the relationship between the preset luminance-level and the luminance ratio of each of the n display regions, determining the luminance ratio corresponding to the target luminance of the pixels in each of the n display regions; and
based on the luminance of the pixels in the central area and the luminance ratio corresponding to the target luminance of the pixels in each of the n display regions, determining the corresponding target luminance of the pixels in each of the n display regions.

### Claim 8 (depends on 1)

The method according to claim 1, wherein the luminance of the pixels in the central area is an average value of the luminance of all the pixels in the central area.

### Claim 9 (depends on 1)

The method according to claim 1, wherein n is an integer equal to or larger than 3.

### Claim 10 (depends on 9)

The method according to claim 9, wherein n is 15.

### Claim 11 (depends on 1)

The method according to claim 1, wherein:
along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, ratios between the corresponding target luminance of the pixels in the n display regions and the luminance of the pixels in the central area form a geometric sequence.

### Claim 12 (depends on 1)

The method according to claim 1, wherein:
the edge area of the circular display screen is divided into a first luminance-level display region, a second luminance-level display region, and a third luminance-level display region; and
along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, ratios between the corresponding target luminance of pixels in the first, second and third luminance-level display regions and the luminance of the pixels in the central area are approximately 0.9, 0.8 and 0.7, respectively.

### Claim 13 (depends on 1)

The method according to claim 1, wherein:
the edge area of the circular display screen is divided into a first luminance-level display region, a second luminance-level display region, and a third luminance-level display region; and
along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, ratios between the corresponding target luminance of pixels in the first, second and third luminance-level display regions and the luminance of the pixels in the central area are approximately 0.5, 0.25 and 0.125, respectively.

### Claim 14 (depends on 1)

The method according to claim 1, wherein the luminance of the pixels in the central area is configured to be luminance of one or more pixels closest to the central area.

### Claim 15 (depends on 4)

The method according to claim 4, wherein:
the pixel size is a length or a width of a pixel.

### Claim 16

A method for improving display performance at edges of a circular display screen, comprising:
determining an edge area and a central area of the circular display screen, the edge area surrouding the central area;
along a direction from a geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into n display regions each having a different luminance-level, where n is 15; and
according to luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting luminance of pixels in each of the n display regions to corresponding target luminance,
wherein the pixels in each of the n display regions have different corresponding target luminance,
the pixels in a same display region have same corresponding target luminance,
along the direction from the geometric center to the edge area of the circular display screen, the corresponding target luminance of the pixels in the n display regions sequentially decreases, and
along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, ratios between the corresponding target luminance of the pixels in the n display regions and the luminance of the pixels in the central area is sequentially configured to be approximately 0.9, 0.8, 0.6, 0.5, 0.4, 0.3, 0.2, 0.1, 0.08, 0.06, 0.04, 0.03, 0.02, and 0.01.

### Claim 17 (depends on 16)

The method according to claim 16, wherein the luminance of the pixels in the central area is an average value of the luminance of all the pixels in the central area.

### Claim 18

A method for improving display performance at edges of a circular display screen, comprising:
determining an edge area and a central area of the circular display screen, the edge area surrouding the central area;
along a direction from a geometric center of the circular display screen to the edge area of the circular display screen, dividing the edge area into n display regions each having a different luminance-level, where n is a positive integer larger than 1; and
according to luminance of pixels in the central area and the luminance-level of each of the n display regions, adjusting luminance of pixels in each of the n display regions to corresponding target luminance,
wherein the pixels in each of the n display regions have different corresponding target luminance,
the pixels in a same display region have same corresponding target luminance,
along the direction from the geometric center to the edge area of the circular display screen, the corresponding target luminance of the pixels in the n display regions sequentially decreases,
along the direction from the geometric center of the circular display screen to the edge area of the circular display screen, ratios between the corresponding target luminance of the pixels in the n display regions and the luminance of the pixels in the central area form an arithmetic sequence, and
the arithmetic sequence has a common difference of approximately 0.1.