Display device and method of driving the same

Patent metadata

Field	Value
Publication number	US-10733702-B2
Application number	US-201815917475-A
Country	US
Kind code	B2
Filing date	Mar 9, 2018
Priority date	Jul 20, 2017
Publication date	Aug 4, 2020
Grant date	Aug 4, 2020

Abstract

A display device includes a display panel including a display panel including a plurality of pixels, a memory device configured to store pre-scaling data and compensation data, and a panel driver configured to generate first image data by performing a pre-scaling operation on input image data based on the pre-scaling data, generate second image data by performing a compensation operation on the input image data based on the compensation data, and provide a driving signal to the pixels to display a pre-scaled image corresponding to the first image data, or to display a compensated image corresponding to the second image data, wherein the pre-scaling operation is performed before the compensation operation is performed.

First claim

What is claimed is:

1. A display device comprising:
a display panel comprising a plurality of pixels;
a memory device configured to store pre-scaling data and compensation data; and
a panel driver configured to:
generate first image data by performing a pre-scaling operation on input image data based on the pre-scaling data;
generate second image data by performing a compensation operation on the input image data based on the compensation data; and
provide a driving signal to the pixels to display a pre-scaled image corresponding to the first image data, or to display a compensated image corresponding to the second image data,
wherein the pre-scaling operation is performed only during a period after a power-on operation of the display device starts and before a loading of the compensated image is-completed, the pre-scaling operation beginning before, yet ending after, the display panel starts to display an image as a result of the power-on operation.

2. The display device of claim 1 , wherein the compensation data are generated based on accumulated data generated by accumulatively storing the input image data, and
wherein the pre-scaling data are generated based on the compensation data.

3. The display device of claim 2 , wherein the pre-scaling data are set to an average value of the compensation data.

4. The display device of claim 2 , wherein the pre-scaling data are set to a maximum value of the compensation data or to a minimum value of the compensation data.

5. The display device of claim 1 , wherein the pre-scaling operation loads a pre-scaling factor for all of the pixels as the pre-scaling data, and applies the pre-scaling factor to the input image data to generate the first image data.

6. The display device of claim 5 , wherein the compensation operation loads a plurality of compensation factors for the pixels as the compensation data, and applies the compensation factors to the input image data for each of the pixels, respectively, to generate the second image data.

7. The display device of claim 6 , wherein the panel driver is configured to:
drive the display panel based on the first image data until the compensation factors are loaded; and
drive the display panel based on the second image data after the compensation factors are loaded.

8. The display device of claim 1 , wherein the panel driver is configured to perform a transition operation for determining third image data corresponding to values between the first image data and the second image data, and
wherein a transition image corresponding to the third image data is displayed during a transition period between a first period during which the pre-scaled image is displayed and a second period during which the compensated image is displayed.

9. The display device of claim 8 , wherein the third image data are gradually changed from the first image data to the second image data during the transition period.

10. The display device of claim 8 , wherein a time length of the transition period increases as a difference between the first image data and the second image data increases.

11. The display device of claim 1 , wherein the pre-scaling operation loads a plurality of pre-scaling factors for each of a plurality of pre-scaling pixel groups comprising respective ones of the pixels as the pre-scaling data, and applies the pre-scaling factors to the input image data for each of the pre-scaling pixel groups, respectively, to generate the first image data.

12. The display device of claim 11 , wherein the compensation operation loads a plurality of compensation factors for each of a plurality of compensation pixel groups comprising respective ones of the pixels as the compensation data, and applies the compensation factors to the input image data for each of the compensation pixel groups, respectively, to generate the second image data.

13. The display device of claim 12 , wherein a first number of the pixels of one of the pre-scaling pixel groups is larger than a second number of the pixels of one of the compensation pixel groups.

14. The display device of claim 11 , wherein the first image data are generated by performing an interpolation operation on the pre-scaling factors at a boundary of one of the pre-scaling pixel groups.

15. The display device of claim 1 , wherein, when the compensation data are updated, the pre-scaling data are updated based on the updated compensation data.

16. A method of driving a display device to improve display quality thereof, the display device comprising a memory device for storing pre-scaling data and compensation data, the method comprising:
performing a pre-scaling operation for input image data based on the pre-scaling data to generate first image data;
displaying a pre-scaled image on the display device corresponding to the first image data;
performing a compensation operation for the input image data based on the compensation data to generate second image data; and
displaying a compensated image on the display device corresponding to the second image data,
wherein the pre-scaling operation is performed only during a period after a power-on operation of the display device starts and before a loading of the compensated image is completed, the pre-scaling operation beginning before, yet ending after, a display panel of the display device starts to display an image as a result of the power-on operation.

17. The method of claim 16 , wherein the compensation data are generated based on accumulated data generated by accumulatively storing the input image data, and
wherein the pre-scaling data are generated based on the compensation data.

18. The method of claim 17 , wherein the pre-scaling data are set to an average value of the compensation data.

19. The method of claim 16 , further comprising:
performing a transition operation for determining third image data between the first image data and the second image data; and
displaying a transition image corresponding to the third image data during a transition period between a first period during which the pre-scaled image is displayed and a second period during which the compensated image is displayed.

20. The method of claim 19 , further comprising gradually changing the third image data from the first image data to the second image data during the transition period.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Jae Shin
• Park Seungho

Classifications

• G09G2320/0247

  Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes · CPC title

• G06T3/40 Primary

  Scaling of whole images or parts thereof, e.g. expanding or contracting · CPC title

• G09G3/20 Primary

  for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix {no fixed position being assigned to or needed to be assigned to the individual characters or partial characters} · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title

• G09G2340/04

  Changes in size, position or resolution of an image · CPC title