Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-2023368717-A1
Application number	US-202318197434-A
Country	US
Kind code	A1
Filing date	May 15, 2023
Priority date	May 16, 2022
Publication date	Nov 16, 2023
Grant date	—

Abstract

A display device includes a pixel component including a first pixel area in which pixels are disposed at a first density, and a second pixel area in which the pixels are disposed at a second density less than the first density, and a grayscale compensator which converts input grayscale values for the first pixel area to output grayscale values within a first grayscale range, and converts the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range. An upper limit of the second grayscale range is greater than an upper limit of the first grayscale range.

First claim

What is claimed is:

1 . A display device comprising:
a pixel component including:
a first pixel area in which first pixels are disposed at a first density, and
a second pixel area in which second pixels are disposed at a second density lower than the first density; and
a grayscale compensator which converts input grayscale values for the first pixel area to output grayscale values within a first grayscale range, converts the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range, wherein an upper limit of the second grayscale range is greater than an upper limit of the first grayscale range.

2 . The display device according to claim 1 , wherein the grayscale compensator comprises a gain applicator which applies a gain to the input grayscale values and generates gain-applied grayscale values lower than the input grayscale values.

3 . The display device according to claim 2 , wherein the grayscale compensator further comprises an area discriminator which determines whether the gain-applied grayscale values are grayscale values corresponding to the first pixel area or grayscale values corresponding to the second pixel area.

4 . The display device according to claim 3 , wherein the grayscale compensator further comprises a look-up table which defines a relationship between the output grayscale values and the gain-applied grayscale values.

5 . The display device according to claim 4 , wherein the grayscale compensator provides the output grayscale values identical to the gain-applied grayscale values in a case in which the gain-applied grayscale values correspond to the first pixel area, and provides the output grayscale values based on the look-up table in a case in which the gain-applied grayscale values correspond to the second pixel area.

6 . The display device according to claim 5 ,
wherein the input grayscale values include first input grayscale values for a first color, second input grayscale values for a second color, and third input grayscale values for a third color, and wherein the gain applicator applies an identical gain to the first input grayscale values, the second input grayscale values, and the third input grayscale values.

7 . The display device according to claim 6 ,
wherein the gain-applied grayscale values include first gain-applied grayscale values for the first color, second gain-applied grayscale values for the second color, and third gain-applied grayscale values for the third color, wherein the output grayscale values include first output grayscale values for the first color, second output grayscale values for the second color, and third output grayscale values for the third color, wherein the look-up table defines the first output grayscale values for the first gain-applied grayscale values, the second output grayscale values for the second gain-applied grayscale values, and the third output grayscale values for the third gain-applied grayscale values, and wherein the first output grayscale values, the second output gray scale values and the third output grayscale values are different from each other.

8 . The display device according to claim 4 ,
wherein the look-up table defines the output grayscale values only for input-defined grayscale values which are a portion of the gain-applied grayscale values, and wherein the grayscale compensator generates the output grayscale values for the gain-applied grayscale values other than the input-defined grayscale scale values by performing an interpolation operation using the look-up table.

9 . The display device according to claim 8 , further comprising a grayscale voltage generator which provides grayscale voltages corresponding to the output grayscale values,
wherein the grayscale voltages include reference grayscale voltages for reference grayscale values, and divided grayscale voltages generated by dividing the reference grayscale voltages.

10 . The display device according to claim 9 , wherein the input-defined grayscale values of the look-up table correspond to the reference grayscale values.

11 . A method of driving a display device comprising a pixel component including a first pixel area in which first pixels are disposed at a first density, and a second pixel area in which second pixels are disposed at a second density lower than the first density, the method comprising:
converting input grayscale values for the first pixel area to output grayscale values within a first gray scale range; and converting the input grayscale values for the second pixel area to the output grayscale values within a second grayscale range, wherein an upper limit of the second grayscale range is greater than an upper limit of the first grayscale range.

12 . The method according to claim 11 , further comprising generating gain-applied grayscale values lower than the input grayscale values by applying a gain to the input grayscale values.

13 . The method according to claim 12 , further comprising determining whether the gain-applied grayscale values are grayscale values corresponding to the first pixel area or grayscale values corresponding to the second pixel area.

14 . The method according to claim 13 , wherein the display device further comprises a look-up table which defines a relationship between the output grayscale values and the gain-applied grayscale values.

15 . The method according to claim 14 , further comprising:
providing the output grayscale values identical to the gain-applied grayscale values in a case in which the gain-applied grayscale values correspond to the first pixel area; and providing the output grayscale values based on the look-up table in a case in which the gain-applied grayscale values correspond to the second pixel area.

16 . The method according to claim 15 ,
wherein the input grayscale values include first input grayscale values for a first color, second input grayscale values for a second color, and third input grayscale values for a third color, and wherein an identical gain is applied to the first input grayscale values, the second input grayscale values, and the third input grayscale values.

17 . The method according to claim 16 ,
wherein the gain-applied grayscale values include first gain-applied grayscale values for the first color, second gain-applied grayscale values for the second color, and third gain-applied grayscale values for the third color, wherein the output grayscale values include first output grayscale values for the first color, second output grayscale values for the second color, and third output grayscale values for the third color, wherein the look-up table defines the first output grayscale values for the first gain-applied grayscale values, the second output grayscale values for the second gain-applied grayscale values, and the third output grayscale values for the third gain-applied grayscale values, and wherein the first output grayscale values, the second output gray scale values and the third output grayscale values are different from each other.

18 . The method according to claim 14 , wherein the look-up table defines the output grayscale values only for input-defined grayscale values which are a portion of the gain-applied grayscale values,
the method further comprising generating the output gray scale values for the gain-applied grayscale values other than the input-defined grayscale scale values by performing an interpolation operation using the look-up table.

19 . The method according to claim

Assignees

• Samsung Display Co Ltd

Inventors

• Hyun Chang Ho

Classifications

• G09G3/2007 Primary

  Display of intermediate tones · CPC title

• G09G3/3233 Primary

  with pixel circuitry controlling the current through the light-emitting element · CPC title

• G09G2300/0842

  forming a memory circuit, e.g. a dynamic memory with one capacitor · CPC title

• G09G2300/0819

  used for counteracting undesired variations, e.g. feedback or autozeroing · CPC title

• G09G2320/0233

  Improving the luminance or brightness uniformity across the screen · CPC title