Device and method for compensating for stains caused by deterioration of a display device

Patent metadata

Field	Value
Publication number	US-12080205-B2
Application number	US-202117493169-A
Country	US
Kind code	B2
Filing date	Oct 4, 2021
Priority date	Nov 4, 2020
Publication date	Sep 3, 2024
Grant date	Sep 3, 2024

Abstract

A method of compensating for stains caused by deterioration of a display device, the display device including an illuminance sensor and a display panel including pixels and an optical fingerprint sensor, the method including determining, while in a test mode of the display device and via the illuminance sensor, whether an illuminance is a reference value or less, emitting, while in the test mode of the display device, first color light from the display panel when the illuminance is the reference value or less, and acquiring, while in the test mode of the display device, afterimage compensation data relating to amounts of deterioration of the pixels by receiving the first color light through an optical fingerprint sensor.

First claim

What is claimed is:

1. A method of compensating for stains caused by deterioration of a display device, the display device including an illuminance sensor and a display panel including a folding area, a first non-folding area positioned on a first side of the folding area, and a second non-folding area positioned on a second side of the folding area, the first non-folding area including first pixels, the second non-folding area including second pixels and an optical fingerprint sensor, the method comprising:
determining, while in a test mode of the display device and via the illuminance sensor, whether an illuminance is a reference value or less;
emitting, while in the test mode of the display device, first light of a first color from the first pixels when the illuminance is the reference value or less;
acquiring, while in the test mode of the display device, first afterimage compensation data relating to amounts of deterioration of the first pixels by receiving the first light through the optical fingerprint sensor;
emitting, while in the test mode of the display device, second light of the first color from the second pixels when the illuminance is the reference value or less;
acquiring, while in the test mode of the display device, second afterimage compensation data relating to amounts of deterioration of the second pixels by receiving the second light through the optical fingerprint sensor;
tuning an optical characteristic of the first afterimage compensation data based on an optical characteristic of the second afterimage compensation data; and
converting, while in the test mode of the display device, pixel data based on the tuned first afterimage compensation data.

2. The method of claim 1 , further comprising acquiring a first plurality of afterimage compensation data including the first afterimage compensation data and the second afterimage compensation data based on a plurality of grayscales of the first color.

3. The method of claim 2 , further comprising:
emitting, while in the test mode of the display device, third light of a second color from the first pixels;
acquiring, while in the test mode of the display device, third afterimage compensation data relating to amounts of deterioration of the first pixels by receiving the third light through the optical fingerprint sensor;
emitting, while in the test mode of the display device, fourth light of the second color from the second pixels; and
acquiring, while in the test mode of the display device, fourth afterimage compensation data relating to amounts of deterioration of the second pixels by receiving the fourth light through the optical fingerprint sensor.

4. The method of claim 3 , further comprising acquiring a second plurality of afterimage compensation data including the third afterimage compensation data and the fourth afterimage compensation data based on a plurality of grayscales of the second color.

5. The method of claim 3 , further comprising:
emitting, while in the test mode of the display device, fifth light of a third color from the first pixels;
acquiring, while in the test mode of the display device, fifth afterimage compensation data relating to amounts of deterioration of the first pixels by receiving the fifth light through the optical fingerprint sensor;
emitting, while in the test mode of the display device, sixth light of the third color from the second pixels; and
acquiring, while in the test mode of the display device, sixth afterimage compensation data relating to amounts of deterioration of the second pixels by receiving the sixth light through the optical fingerprint sensor.

6. The method of claim 5 , further comprising acquiring a third plurality of afterimage compensation data including the fifth afterimage compensation data and the sixth afterimage compensation data based on a plurality of grayscales of the third color.

7. The method of claim 5 , wherein each of the first color to the third color is any one of red, green, and blue, and
the first color to the third color differ from each other.

8. The method of claim 1 , wherein
the display device is in a folded state during the test mode of the display device.

9. The method of claim 1 , further comprising, after the acquiring of the first afterimage compensation data, processing, while in the test mode of the display device, the first afterimage compensation data.

10. The method of claim 9 , wherein the processing of the first afterimage compensation data comprises:
removing data resulting from external factors from the first afterimage compensation data; and
interpolating the first afterimage compensation data for a region of the display panel which is not covered by the optical fingerprint sensor.

11. The method of claim 9 , wherein the display device further includes a cover window disposed on the display panel, the method further comprising:
providing the second light from the second pixels to the cover window; and
providing the second light from the cover window to the optical fingerprint sensor.

12. The method of claim 9 , further comprising, after the processing of the first afterimage compensation data:
calculating, while in the test mode of the display device, an afterimage compensation coefficient; and
storing, while in the test mode of the display device, the calculated afterimage compensation coefficient.

13. The method of claim 12 , further comprising emitting, while in an operation mode of the display device and via the pixels of the display panel, light based on the afterimage compensation coefficient, and wherein the operation mode of the display device is different than the test mode of the display device.

14. A device for compensating for stains caused by deterioration of a display device, the device comprising:
an illuminance sensor configured to determine, while the display device is in a test mode, whether an illuminance is a reference value or less;
a display panel including a folding area, a first non-folding area positioned on a first side of the folding area, and a second non-folding area positioned on a second side of the folding area, wherein the first non-folding area includes first pixels configured to emit, while the display device is in the test mode, first light of a first color when the illuminance is the reference value or less, and wherein the second non-folding area includes:
second pixels configured to emit, while the display device is in the test mode, second light of the first color when the illuminance is the reference value or less, and
an optical fingerprint sensor configured to acquire, while the display device is in the test mode, first afterimage compensation data relating to amounts of deterioration of the first pixels by receiving the first light and second afterimage compensation data relating to amounts of deterioration of the second pixels by receiving the second light;

an application chip configured to, while the display device is in the test mode:
tune an optical characteristic of the first afterimage compensation data based on an optical characteristic of the second afterimage compensation data,
process the tuned first afterimage compensation data to obtain processed afterimage compensation data, and
calculate an afterimage compensation coefficient based on the processed afterimage compensation data
and

a display driver circuit configured to, while the display device is in the test mode:
convert pixel data based on the afterimage compensation coefficient.

15. The device of claim 14 , wherein the display driver circuit is further configured to store, while the display device is

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Hyun Dae
• Park Kyung Tea

Classifications

• G06V40/1318

  using electro-optical elements or layers, e.g. electroluminescent sensing · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G2320/029

  by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel · CPC title

• G09G2320/045

  Compensation of drifts in the characteristics of light emitting or modulating elements · CPC title

• G09G2320/0257

  Reduction of after-image effects · CPC title