# US 11,308,845 B2 · Display panel drive method and device

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- Number: US 11,308,845 B2
- Document ID: US11308845B2
- Status: Granted
- Kind: B2
- Application number: 16/769,183
- Filed: 2018-08-16
- Published: 2021-07-15
- Granted: 2022-04-19
- Earliest claimed: 2018-01-10
- Assignees: Hkc Corporation Limited; Chongqing Hkc Optoelectronics Technology Co., Ltd.
- Applicants: Hkc Corporation Limited; Chongqing Hkc Optoelectronics Technology Co., Ltd.
- Inventors: Chih Tsung Kang
- Web page: https://patentgrep.com/patent/US11308845B2

## CPC

- G09G 3/2003: {Display of colours (specific for liquid crystal displays G09G3/3607)}
- G09G 3/3607: {for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels (display of colours in flat matrix panels other than liquid crystal displays G09G3/2003; grey scales specific for television H04N3/127)}
- G09G 2300/0452: Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
- G09G 2320/0276: for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
- G09G 2320/028: by changing the viewing angle properties, e.g. widening the viewing angle, adapting the viewing angle to the view direction
- G09G 2320/066: for control of contrast
- G09G 2320/0673: for control of gamma adjustment, e.g. selecting another gamma curve
- G09G 2320/068: for control of viewing angle adjustment
- G09G 2360/16: Calculation or use of calculated indices related to luminance levels in display data
- 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

This application relates to a driving method of a display panel. The method includes: dividing sub pixels of the display panel into a plurality of sub pixel groups, each sub pixel group including the same quantity of color sub pixels; for each of the sub pixel groups, respectively adjusting a gamma value of a curve of brightness of each color sub pixel changing with a drive voltage; and for each sub pixel group, adjusting the adjusted gamma value according to a color property of the sub pixel group.

## Claims

### Claim 1

A drive method of a display panel, comprising:
dividing sub pixels of the display panel into a plurality of sub pixel groups, each sub pixel group comprising the same quantity of color sub pixels;
for each of the sub pixel groups, respectively adjusting a gamma value of a curve of brightness of each color sub pixel changing with a drive voltage, comprising:
acquiring a difference curve between a curve of brightness of each type of color sub pixel changing with a drive voltage at a front view angle and a curve of brightness of each type of color sub pixel changing with a drive voltage at a side view angle; and
adjusting the gamma value of a corresponding color sub pixel in the sub pixel group according to the difference curve, comprising:
setting different drive voltage intervals according to the difference curve, and setting a set gamma value corresponding to each drive voltage interval; and
acquiring the drive voltage interval where a quantity of drive voltages distributed is greater than a set threshold, and setting the set gamma value corresponding to the acquired drive voltage interval as the gamma value of the corresponding color sub pixel in the sub pixel group; and
for each of the sub pixel groups, adjusting the adjusted gamma value according to a color property of the sub pixel group.

### Claim 2 (depends on 1)

The method according to claim 1, wherein each sub pixel group comprises the same quantity of first sub pixels, second sub pixels, and third sub pixels; and the step of adjusting the adjusted gamma value according to the color property of the sub pixel group comprises:
respectively calculating a first average drive signal of the first sub pixels, a second average drive signal of the second sub pixels, and a third average drive signal of the third sub pixels;
calculating a parameter value of the sub pixel group in a color spatial system according to the first average drive signal, the second average drive signal, and the third average drive signal; and
respectively and correspondingly adjusting the adjusted gamma value of each color sub pixel according to the parameter value.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the parameter value comprises a saturation value and a hue value.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the step of respectively and correspondingly adjusting the adjusted gamma value of each color sub pixel according to the parameter value comprises:
when determining that the saturation value is between a first saturation threshold and a second saturation threshold, respectively and correspondingly adjusting the adjusted gamma value of each color sub pixel.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the step of when determining that the saturation value is between the first saturation threshold and the second saturation threshold, respectively and correspondingly adjusting the adjusted gamma value of each color sub pixel comprises:
when determining that the saturation value is between the first saturation threshold and the second saturation threshold, respectively adjusting the adjusted gamma value of each color sub pixel in different manners under the condition that the hue value is in different intervals.

### Claim 6 (depends on 5)

The method according to claim 5, wherein the intervals where the hue value falls comprises a first interval, a second interval, a third interval, a fourth interval, a fifth interval, and a sixth interval;
the first interval is 0°<H≤45° and 315°<H≤360°; the second interval is 45°<H≤135°; the third interval is 135°<H≤205°; the fourth interval is 205°<H≤245°; the fifth interval is 245°<H≤295°; and the sixth interval is 295°<H≤315°, wherein H is the hue valve.

### Claim 7 (depends on 1)

The method according to claim 1, wherein after the step of for each of the sub pixel groups, adjusting the adjusted gamma value according to the color property of the sub pixel group, the method further comprising:
filtering the adjusted gamma value of each sub pixel group.

### Claim 8 (depends on 1)

The method according to claim 1, wherein after the step of for each of the sub pixel groups, adjusting the adjusted gamma value according to the color property of the sub pixel group, the method further comprising:
filtering the adjusted gamma value of each the sub pixel group using a spatial low pass filtering function, the spatial low pass filtering function having an expression as follows:
g(x,y)=w1*f(x−1,y−1)+w2*f(x−1,y)+w3*f(x−1,y+1)+w4*f(x,y−1)+w5*f(x,y)+w6*f(x,y+1)+w7*f(x+1,y−1)+w8*f(x+1,y)+w9*f(x+1,y+1),
wherein f(x,y) represents the gamma value of a set sub pixel group before filtering; g(x,y) represents the gamma value of the set sub pixel group after filtering; f(x−1,y−1), f(x−1,y), . . . , and f(x+1,y+1) represent the gamma values of the sub pixel groups surrounding the set sub pixel group; and w1, w2, . . . , and w9 represent weights of various positions in the spatial low pass filtering function.

### Claim 9

A drive device of a display panel, comprising:
a pixel dividing module, configured to divide sub pixels of the display panel into a plurality of sub pixel groups, each sub pixel group comprising various color sub pixels having the same quantity;
a first adjustment module, configured to: for each of the sub pixel groups, respectively adjust a gamma value of a curve of brightness of each color sub pixel changing with a drive voltage, wherein the first adjustment module comprises:
a curve acquiring unit, configured to acquire a difference curve between a curve of brightness of each type of color sub pixel changing with a drive voltage at a front view angle and a curve of brightness of each type of color sub pixel changing with a drive voltage at a side view angle; and
a gamma value adjustment unit, configured to adjust a gamma value of a corresponding color sub pixel in the sub pixel group according to the difference curve, wherein the gamma value adjustment unit comprises:
an interval setting subunit, configured to set different drive voltage intervals according to the difference curve, and set a set gamma value corresponding to each drive voltage interval; and
a gamma value setting subunit, configured to acquire a drive voltage interval where quantity of drive voltages distributed is greater than a set threshold, and setting the set gamma value of the acquired drive voltage interval as the gamma value of a corresponding color sub pixel in the sub pixel group; and
a second adjustment module, configured to: for each of the sub pixel groups, adjust the adjusted gamma value according to a color property of the sub pixel group.

### Claim 10 (depends on 9)

The drive device according to claim 9, wherein the sub pixel groups comprise the same quantity of first sub pixels, second sub pixels, and third sub pixels; and the second adjustment module comprises:
an average drive signal calculation unit, configured to respectively calculate a first average drive signal of the first sub pixels, a second average drive signal of the second sub pixels and a third average drive signal of the third sub pixels;
a parameter value acquiring unit, configured to calculate a parameter value of the sub pixel group in a color spatial system according to the first average drive signal, the second average drive signal and the third average drive signal; and
a re-adjustment unit, configured to respectively and correspondingly adjust the adjusted gamma value of each color sub pixel according to the parameter value.

### Claim 11 (depends on 10)

The drive device according to claim 10, wherein the parameter value comprises a saturation value and a hue value.

### Claim 12 (depends on 11)

The drive device according to claim 11, wherein the re-adjustment unit is configured to: when determining that the saturation value is between a first saturation threshold and a second saturation threshold, respectively and correspondingly adjust the adjusted gamma value of each color sub pixel.

### Claim 13 (depends on 12)

The drive device according to claim 12, wherein the re-adjustment unit is configured to: when determining that the saturation value is between the first saturation threshold and the second saturation threshold, respectively adjust the adjusted gamma value of each color sub pixel in different manners under the condition that the hue value is in different intervals.

### Claim 14 (depends on 13)

The drive device according to claim 13, wherein the intervals where the hue value falls comprises a first interval, a second interval, a third interval, a fourth interval, a fifth interval and a sixth interval;
the first interval is 0°<H≤45° and 315°<H≤360°; the second interval is 45°<H≤135°; the third interval is 135°<H≤205°; the fourth interval is 205°<H≤245°; the fifth interval is 245°<H≤295°; and the sixth interval is 295°<H≤315°, wherein H is the hue valve.

### Claim 15 (depends on 9)

The drive device according to claim 9, wherein the drive device of the display panel further comprising:
a filtering module, configured to filter the adjusted gamma value of each sub pixel group.

### Claim 16

A drive method of a display panel, comprising:
dividing sub pixels of the display panel into a plurality of sub pixel groups, each sub pixel group comprising various color sub pixels of the same quantity;
for each of the sub pixel groups, acquiring a difference curve between a curve of brightness of each type of color sub pixel changing with a drive voltage at a front view angle and a curve of brightness of each type of color sub pixel changing with a drive voltage at a side view angle, setting different drive voltage intervals according to the difference curve and setting a set gamma value corresponding to each drive voltage interval, acquiring the drive voltage interval where a quantity of drive voltages distributed is greater than a set threshold, and setting the set gamma value of the acquired drive voltage interval as the gamma value of a corresponding color sub pixel in the sub pixel group; and
for each of the sub pixel groups, adjusting the adjusted gamma value according to a color property of the sub pixel group.