Method of compensating for an excimer laser annealing mura and display device employing the same

Patent metadata

Field	Value
Publication number	US-10127853-B2
Application number	US-201615388933-A
Country	US
Kind code	B2
Filing date	Dec 22, 2016
Priority date	Jan 20, 2016
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

A method of compensating for Mura in a display panel includes displaying a high gray-scale image and a low gray-scale image on a display panel. The displayed images are photographed to generate a high gray-scale luminance image and a low gray-scale luminance image. An ELA Mura for-measurement image having moiré-removed luminance values is generated by dividing luminance values of the low gray-scale luminance image by luminance values of the high gray-scale luminance image. One-dimensional average data is obtained from the ELA Mura for-measurement image. The one-dimensional average data is transformed into frequency-domain data. Target frequency-domain data having a maximum peak value is identified from the frequency-domain data. A direction, an intensity, and a frequency of the ELA Mura are obtained from the target frequency-domain data. A filter is determined based on the obtained information. The filter is applied to image data.

First claim

What is claimed is:

1. A method of compensating for Mura in a display panel, the method comprising:
displaying a high gray-scale image and a low gray-scale image on a display panel;
photographing the high gray-scale image and the low gray-scale image using a luminance measuring equipment to generate a high gray-scale luminance image and a low gray-scale luminance image, respectively;
generating an ELA Mura for-measurement image having moire-removed luminance values by dividing luminance values of the low gray-scale luminance image by luminance values of the high gray-scale luminance image;
obtaining, at predetermined rotation angles while rotating the ELA Mura for-measurement image, one-dimensional average data by sequentially listing average luminance values, each of which is calculated by averaging luminance values in a predetermined direction on the ELA Mura for-measurement image;
transforming the obtained one-dimensional average data into frequency-domain data using a Fast Fourier Transform algorithm;
identifying target frequency-domain data having a maximum peak value from among the frequency-domain data;
obtaining a direction, an intensity, and a frequency of the ELA Mura from the target frequency-domain data;
determining an ELA Mura for-compensation band-reject filter based on the obtained direction, intensity, and frequency of the ELA Mura; and
applying the ELA Mura for-compensation band-reject filter to initial image data to generate corrected image data.

2. The method of claim 1 , wherein the moire-removed luminance values are normalized to be less than or equal to 1.

3. The method of claim 1 , wherein the ELA Mura for-measurement image is rotated from 0° to 180°, an interval of the rotation angles is 0.1°, and a number of the one-dimensional average data is 1800.

4. The method of claim 1 , wherein the direction of the ELA Mura is determined based on the rotation angle at which the target frequency-domain data is obtained, the intensity of the ELA Mura is determined based on the maximum peak value of the target frequency-domain data, and the frequency of the ELA Mura is determined based on a frequency at which the maximum peak value of the target frequency-domain data is located.

5. The method of claim 4 , wherein the ELA Mura for-compensation band-reject filter has no band-reject frequency band when the maximum peak value of the target frequency-domain data is less than a predetermined reference value.

6. The method of claim 4 , wherein a band-reject frequency band of the ELA Mura for-compensation band-reject filter includes the frequency at which the maximum peak value of the target frequency-domain data is located.

7. The method of claim 6 , wherein a degree of band-reject filtering of the ELA Mura for-compensation band-reject filter decreases as luminance of the image data increases.

8. The method of claim 6 , wherein the ELA Mura for-compensation band-reject filter performs no band-reject filtering when luminance of the image data is higher than predetermined reference luminance.

9. The method of claim 1 , further comprising: correcting the ELA Mura for-compensation band-reject filter based on a re-measured ELA Mura that is generated by measuring the ELA Mura based on a for-correction image displayed on the display panel.

10. A display device comprising:
a display panel including a plurality of pixels;
a scan driver configured to provide a scan signal to the display panel;
a data driver configured to provide a data signal to the display panel;
a timing controller configured to control the scan driver and the data driver; and
an excimer laser annealing (ELA) Mura compensator configured to determine an ELA Mura for-compensation band-reject filter based on a direction, an intensity, and a frequency of an ELA Mura of the display panel and generate ELA Mura compensated image data corresponding to the data signal by applying the determined Mura for-compensation band-reject filter to image data.

11. The device of claim 10 , wherein the ELA Mura compensator is included within the timing controller or the data driver.

12. The device of claim 10 , wherein the ELA Mura compensator is external to the timing controller and the data driver.

13. A display device comprising:
a display panel including a plurality of pixels;
a scan driver configured to provide a scan signal to the display panel;
a data driver configured to provide a data signal to the display panel;
a timing controller configured to control the scan driver and the data driver; and
an excimer laser annealing (ELA) Mura compensator configured to generate ELA Mura compensated image data corresponding to the data signal by applying an Mura for-compensation band-reject filter to image data,
wherein the ELA Mura for-compensation band-reject filter is determined by:
displaying a high gray-scale image arid a low gray-scale image on a display panel;
photographing the high gray-scale image and the low gray-scale image using a luminance measuring equipment to generate a high gray-scale luminance image and a low gray-scale luminance image, respectively generating an ELA Mura for-measurement image having moire-removed luminance values by dividing luminance values of the low gray-scale luminance image by luminance values of the high gray-scale luminance image;
obtaining, at predetermined rotation angles while rotating the ELA Mura for-measurement image, one-dimensional average data by sequentially listing average luminance values each of which is calculated by averaging luminance values in a predetermined direction on the ELA Mura for-measurement image;
transforming the obtained one-dimensional average data into frequency-domain data using a Fast Fourier Transform algorithm;
identifying target frequency-domain data having a maximum peak value from among the frequency-domain data; and
obtaining a direction, an intensity, and a frequency of an ELA Mura that exists in the display panel from the target frequency-domain data having a maximum peak value among the frequency-domain data.

14. The device of claim 13 , wherein the moire-removed luminance values are normalized to be less than or equal to 1.

15. The device of claim 13 , wherein the ELA Mura for-measurement image is rotated from 0° to 180°, an interval of the rotation angles is 0.1°, and a number of the one-dimensional average data is 1800.

16. The device of claim 13 , wherein the direction of the ELA Mura is determined based on the rotation angle at which the target frequency-domain data is obtained, the intensity of the ELA Mura is determined based on the maximum peak value of the target frequency-domain data, and the frequency of the ELA Mura is determined based on a frequency at which the maximum peak value of the target frequency-domain data is located.

17. The device of claim 16 , wherein a band-reject frequency band of the ELA Mura for-compensation band-reject filter includes the frequency at which the maximum peak value of the target frequency-domain data is located.

18. The device of claim 17 , wherein a degree of band-reject filtering of the ELA Mura for-compensation band-reject filter decreases as luminance of the image data increases.

19. The device of claim 17 , wherein the ELA Mura for-compensation band-reject filter performs no band-reject filtering when luminance of the image data is higher than predetermined reference luminance.

20. The device of claim 13 , wherein the ELA Mura for-compensation band-reject filter is corrected based on a re-measured ELA Mura that is genera

Assignees

• Samsung Display Co Ltd

Inventors

• Lee Min-Tak
• Kim Kyu-Seok
• Kim Soo-Young
• Yun Young-Nam
• Lee Hyun-Koo

Classifications

• H10P14/3816

  Pulsed laser beam · CPC title

• H10P14/381

  Beam shaping, e.g. using a mask · CPC title

• G09G2360/145

  the light originating from the display screen · CPC title

• G09G3/3611

  Control of matrices with row and column drivers · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title