Display device and method for controlling same

Patent metadata

Field	Value
Publication number	US-11222597-B2
Application number	US-202017123477-A
Country	US
Kind code	B2
Filing date	Dec 16, 2020
Priority date	Dec 27, 2019
Publication date	Jan 11, 2022
Grant date	Jan 11, 2022

Abstract

Disclosed herein are a display device and a method for controlling the same, and more particularly, to a display device and a method for controlling the same that may compensate degradation of a display panel and may improve image quality. According to the method for controlling the display device of an embodiment, a pattern image is displayed respectively on a plurality of scan blocks set on the display panel. When the pattern image is displayed respectively on the plurality of scan blocks set on the display panel, a current value of each scan block is measured. Then a representative current value is compared with a predetermined reference value, and it is determined whether compensation data of each pixel included in each of the scan blocks is updated.

First claim

What is claimed is:

1. A method for controlling a display device, comprising:
displaying a pattern image respectively in a plurality of scan blocks set on a display panel;
measuring a current value of each of the plurality of scan blocks when the pattern image is displayed;
determining whether to update compensation data of each pixel included in each of the plurality of scan blocks based on a representative current value, wherein the representative current value is determined based on the current value of each of the plurality of scan blocks;
determining a gain value of each pixel included in each of the plurality of scan blocks based on the current value of each of the plurality of scan blocks when it is determined to update the compensation data; and
updating the compensation data of each pixel based on the gain value of each pixel.

2. The method of claim 1 , wherein determining whether to update compensation data of each pixel included in each of the plurality of scan blocks comprises:
comparing the representative current value with a predetermined reference value;
determining to update the compensation data of each pixel included in each of the plurality of scan blocks when the representative current value is higher than or equal to the reference value; and
determining not to update the compensation data of each pixel included in each of the plurality of scan blocks when the representative current value is lower than the reference value.

3. The method of claim 1 , wherein the representative current value is a highest value or a lowest value among differences between current values of the plurality of scan blocks and a prestored reference current value, or is an average value of the differences.

4. The method of claim 1 , further comprising:
displaying a pre-pattern image respectively on a plurality of pre-scan blocks set on the display panel; and
measuring a current value of each of the plurality of pre-scan blocks when the pre-pattern image is displayed; and
setting the plurality of scan blocks in at least one pre-scan block from the plurality of pre-scan blocks selected based on the current value of each of the plurality of pre-scan blocks.

5. The method of claim 1 , wherein determining the gain value of each pixel included in each of the plurality of scan blocks comprises:
calculating an average value of current values of the plurality of scan blocks;
determining a gain value of each of the plurality of scan blocks based on the average value; and
determining a gain value of each pixel included in each of the plurality of scan blocks based on the gain value of each of the plurality of scan blocks.

6. The method of claim 5 , wherein determining the gain value of each pixel included in each of the plurality of scan blocks based on the gain value of each of the plurality of scan blocks comprises:
determining a gain value of each pixel included in each of the plurality of scan blocks by interpolating a gain value of each of the plurality of scan blocks.

7. A display device, comprising:
a display panel comprising a plurality of pixels;
a data driver configured to drive a data line of the display panel;
a gate driver configured to drive a gate line of the display panel;
a timing controller configured to control driving of the data driver and the gate driver; and
a power supply configured to supply a power voltage to the display panel; and
a current scan circuit connected between the display panel and the power supply, and configured to measure magnitude of current flowing in the display panel when an image is displayed on the display panel,
wherein the timing controller is configured to determine a representative current value based on a current value of each scan block, which is measured when a pattern image is displayed respectively on a plurality of scan blocks set on the display panel, to determine whether to update compensation data of each pixel included in each of the plurality of scan blocks based on the representative current value, to determine a gain value of each pixel included in each of the plurality of scan blocks based on the current value of each of the plurality of scan blocks when it is determined to update the compensation data, and to update the compensation data of each pixel based on the gain value of each pixel.

8. The display device of claim 7 , wherein the timing controller is configured to compare the representative current value with a predetermined reference value, to determine to update the compensation of each pixel included in each of the plurality of scan blocks when the representative current value is higher than or equal to the reference value, and to determine not to update the compensation data of each pixel included in each of the plurality of scan blocks when the representative current value is lower than the reference value.

9. The display device of claim 7 , wherein the representative current value is a highest value or a lowest value among differences between the current values of the plurality of scan blocks and a prestored reference current value, or is an average value of the differences.

10. The display device of claim 7 , wherein the timing controller is configured to set the plurality of scan blocks in at least one pre-scan block selected based on the current value of each of the plurality of pre-scan blocks, which is measured when a pre-pattern image is displayed respectively on the plurality of pre-scan blocks set on the display panel.

11. The display device of claim 7 , wherein the timing controller is configured to calculate an average value of current values of the plurality of scan blocks, to determine a gain value of each of the plurality of scan blocks based on the average value, and to determine a gain value of each pixel include in each of the plurality of scan blocks based on the gain value of each of the plurality of scan blocks.

12. The display device of claim 11 , wherein the timing controller is configured to determine a gain value of each pixel included in each of the plurality of scan blocks by interpolating a gain value of each of the plurality of scan blocks.

Assignees

• Lg Display Co Ltd

Inventors

• Bong Seungjong
• Seo Junghoon

Classifications

• G09G2320/0285

  using tables for spatial correction of display data · CPC title

• G09G2320/0233

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

• G09G2310/08

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

• G09G3/2085 Primary

  Special arrangements for addressing the individual elements of the matrix, other than by driving respective rows and columns in combination · CPC title

• G09G2310/0278

  Details of driving circuits arranged to drive both scan and data electrodes · CPC title