Compensation method of display device and display device having compensation value storage unit

Patent metadata

Field	Value
Publication number	US-10748477-B2
Application number	US-201816226439-A
Country	US
Kind code	B2
Filing date	Dec 19, 2018
Priority date	Dec 29, 2017
Publication date	Aug 18, 2020
Grant date	Aug 18, 2020

Abstract

The present disclosure relates to a compensation method of a display device and the display device having a compensation value storage unit, and more particularly, to a method of performing the compensation by changing a compensation density for pixels included in the display device, and the display device having a storage unit for storing a compensation value for performing the method. According to the present disclosure, the compensation method is provided that includes dividing a display panel into a foveated area and a non-foveated area; performing high-density compensation for a plurality of pixels in the foveated area; and performing low-density compensation for a plurality of pixels in the non-foveated area.

First claim

What is claimed is:

1. A compensation method, comprising:
dividing a display panel into a foveated area and a non-foveated area;
performing high-density compensation for the foveated area; and
performing low-density compensation for the non-foveated area,
wherein performing the high-density compensation comprises:
detecting deterioration for all of a plurality of pixels in the foveated area;
generating first compensation values for the plurality of pixels in the foveated area; and
performing compensation for the plurality of pixels in the foveated area using the first compensation values; and

wherein performing the low-density compensation comprises:
detecting deterioration for a subset of pixels among a plurality of pixels in the non-foveated area, the subset including less than all of the plurality of pixels in the non-foveated area;
generating second compensation values for the subset of pixels in the non-foveated area; and
performing compensation for all of the plurality of pixels in the non-foveated area using the second compensation values.

2. The compensation method of claim 1 ,
wherein performing the compensation for all of the plurality of pixels in the non-foveated area comprises dividing all of the plurality of pixels into a plurality of sub-groups, each sub-group including at least one pixel of the subset of pixels.

3. The compensation method of claim 2 ,
wherein for a sub-group of the plurality of sub-groups, performing compensation for the at least one pixel of the subset of pixels in the sub-group; and
performing the same compensation for pixels in the sub-group excluding the at least one pixel.

4. The compensation method of claim 2 ,
wherein for a sub-group of the plurality of sub-groups, generating second compensation values required for a plurality of pixels in the sub-group;
calculating an average value of the second compensation values for the plurality of pixels in the sub-group; and
performing compensation for the plurality of pixels in the sub-group based on the average value.

5. The compensation method of claim 2 ,
wherein for a sub-group of the plurality of sub-groups, generating second compensation values required for a plurality of pixels in the sub-group;
calculating a median value of the second compensation values for the plurality of pixels in the sub-group; and
performing compensation for the plurality of pixels in the sub-group based on the median value.

6. The compensation method of claim 2 ,
wherein a number of pixels excluding the subset of pixels in the plurality of sub-groups increases toward outside of the display panel.

7. The compensation method of claim 1 ,
wherein the foveated area is a central area of the display panel of a virtual reality display device.

8. A display device, comprising:
a timing controller;
a data driving unit for receiving a driving signal from the timing controller;
a gate driving unit for receiving the driving signal from the timing controller;
a display panel having a plurality of pixels, for displaying video based on signals received from the data driving unit and the gate driving unit, and divided into a foveated area and a non-foveated area;
a power supply unit for supplying power to the data driving unit, the gate driving unit, and the display panel; and
a storage unit for storing a compensation value for compensating the plurality of pixels,
wherein the display device:
detects deterioration for all of a plurality of pixels in the foveated area and generates first compensation values for the plurality of pixels in the foveated area, and
detects deterioration for a subset of pixels among a plurality of pixels in the non-foveated area, the subset including less than all of the plurality of pixels in the non-foveated area and generates second compensation values for the subset of pixels in the non-foveated area, wherein the storage unit stores the first compensation values and the second compensation values, and

wherein the timing controller:
performs compensation for all of the plurality of pixels in the foveated area using the first compensation values, and
performs compensation for all of the plurality of pixels in the non-foveated area using the second compensation values.

9. The display device of claim 8 ,
wherein all of the plurality of pixels in the non-foveated area are divided into a plurality of sub-groups,
wherein the storage unit stores a second compensation value for one pixel of a plurality of pixels in a sub-group of the plurality of sub-groups, and
wherein the timing controller performs the compensation for the plurality of pixels in the sub-group based on the second compensation value for the one pixel.

10. The display device of claim 8 ,
wherein all of the plurality of pixels in the non-foveated area are divided into a plurality of sub-groups,
wherein the storage unit stores an average value or a median value of second compensation values of a plurality of pixels in a sub-group of the plurality of sub-groups, and
wherein the timing controller performs the compensation for the plurality of pixels in the sub-group based on the average value or the median value of the second compensation values.

11. The display device of claim 8 , wherein the storage unit comprises:
a high-density header portion for storing information indicative of high-density;
a high-density body portion for storing the first compensation values of the plurality of pixels in the foveated area;
a low-density header portion for storing information indicative of low-density; and
a low-density body portion for storing the second compensation values of the subset of pixels in the non-foveated area.

12. The display device of claim 11 ,
wherein a lateral number of memory cells in the high-density body portion is the same as a lateral number of the plurality of pixels in the foveated area, and
wherein a longitudinal number of memory cells in the high-density body portion is the same as a longitudinal number of the plurality of pixels in the foveated area.

13. The display device of claim 12 ,
wherein a lateral number of memory cells in the low-density body portion is the same as the lateral number of memory cells in the high-density body portion, and
wherein a longitudinal number of memory cells in the low-density body portion is the same as the longitudinal number of memory cells in the high-density body portion.

Assignees

• Lg Display Co Ltd

Inventors

• Park Dongwon
• Hong Heejung
• Lee Joonhee
• Yoo Seungjin
• Kwon Yongchul

Classifications

• G09G2320/043

  Preventing or counteracting the effects of ageing · CPC title

• G09G2310/08

  Details of timing specific for flat panels, other than clock recovery · CPC title

• G09G2300/043

  Compensation electrodes or other additional electrodes in matrix displays related to distortions or compensation signals, e.g. for modifying TFT threshold voltage in column driver · CPC title

• G09G3/3233 Primary

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

• G09G3/3611

  Control of matrices with row and column drivers · CPC title