Display device and method for compensating degradation of display device

Patent metadata

Field	Value
Publication number	US-2016148561-A1
Application number	US-201514841822-A
Country	US
Kind code	A1
Filing date	Sep 1, 2015
Priority date	Nov 26, 2014
Publication date	May 26, 2016
Grant date	—

Abstract

A display device includes a display panel, a plurality of readout circuits, and a deviation corrector. The display panel includes a plurality of pixels. The readout integrated circuits perform a readout operation of detected values including degradation information of the pixels, via readout lines connected to the pixels, when a degradation detecting operation is performed. The deviation corrector calculates weighted values to correct operating deviation of the readout integrated circuits based on an average of initial values. The deviation corrector generates corrected image data to correct input image data based on the weighted values. The initial values correspond to the detected values output from the readout integrated circuits when the display panel is in an initial state in which the pixels are non-degraded.

First claim

What is claimed is:

1 . A display device, comprising:
a display panel including a plurality of pixels; a plurality of readout integrated circuits to perform a readout operation of detected values including degradation information of the pixels, via a plurality of readout lines connected to the pixels, when a degradation detecting operation is performed; a deviation corrector to calculate weighted values to correct operating deviation of the readout integrated circuits based on an average of initial values, and to generate corrected image data to correct input image data based on the weighted values, the initial values being the detected values output from the readout integrated circuits when the display panel is in an initial state in which the pixels are non-degraded; a scan driver to provide a scan signal to the display panel via a plurality of scan lines; a data driver to provide data signals corresponding to the corrected image data to the display panel via a plurality of data lines; and a timing controller to control the readout integrated circuits, the scan driver, and the data driver.

2 . The display device as claimed in claim 1 , wherein:
the display panel includes first through (M)-th pixel columns, where M is a positive integer greater than 1, and the first through (M)-th pixel columns are connected to first through (M)-th readout lines, respectively.

3 . The display device as claimed in claim 2 , wherein the deviation corrector includes:
a first average calculator to calculate first through (M)-th readout line averages based on the initial values, the first through (M)-th readout line averages being averages of the initial values readout from each of the first through (M)-th readout lines; a second average calculator to calculate an initial value average, that is an average of the initial values, based on the first through (M)-th readout line averages; and a weighted value calculator to calculate first through (M)-th weighted values with respect to the first through (M)-th readout lines, the first through (M)-th weighted values to be calculated dividing each of the first through (M)th readout line averages by the initial value average.

4 . The display device as claimed in claim 3 , wherein the deviation corrector includes:
a degradation compensator to generate corrected values of the detected values to compensate degradation of the pixels, by respectively applying the first through (M)-th weighted values to the detected values of the pixels that correspond to the first through (M)-th readout lines, and to generate the corrected image data based on the corrected values.

5 . The display device as claimed in claim 4 , wherein the deviation corrector includes an initial value estimator to calculate an estimated initial value of a degraded pixel based on the initial values of non-degraded pixels adjacent to the degraded pixel when the degraded pixel is detected.

6 . The display device as claimed in claim 5 , wherein the non-degraded pixels for calculating the estimated initial value and the degraded pixel are in a same pixel column.

7 . The display device as claimed in claim 6 , wherein the first calculator is to calculate a (K)-th readout line average based on the initial values corresponding to a (K)-th pixel column and the estimated initial value corresponding to the (K)-th pixel column when the degraded pixel is in the (K)th pixel column, where K is a positive integer less than or equal to M.

8 . The display device as claimed in claim 5 , wherein the non-degraded pixels for calculating the estimated initial value and the degraded pixel are in a same pixel row.

9 . The display device as claimed in claim 1 , wherein the initial values correspond to drive currents of the pixels in the initial state.

10 . The display device as claimed in claim 1 , wherein the initial values correspond to drive voltages of the pixels in the initial state.

11 . The display device as claimed in claim 1 , wherein a number of the readout lines is equal to a number of the data lines.

12 . The display device as claimed in claim 1 , wherein the deviation corrector is in the timing controller.

13 . A method for compensating degradation of a display device, the method comprising:
calculating weighted values to correct operating deviation of a plurality of readout integrated circuits, the weighted values to be calculated based on an average of initial values output from the readout integrated circuits when a display panel is in an initial state in which the pixels are non-degraded; detecting detected values including degradation information of the pixels by the readout integrated circuits; calculating corrected values of the detected values to compensate degradation of the pixels by applying the weighted values to the detected values of the pixels; and generating corrected image data to correct input image data based on the corrected values.

14 . The method as claimed in claim 13 , wherein:
the display panel includes first through (M)-th pixel columns, where M is a positive integer greater than 1 , and the first through (M)-th pixel columns are connected to first through (M)th readout lines, respectively.

15 . The method as claimed in claim 14 , wherein calculating the weighted values includes:
performing a readout operation of the initial values output from the first through (M)-th readout lines; calculating first through (M)th readout line averages that correspond to respective averages of the initial values corresponding to the first through (M)-th readout lines; calculating an initial value average corresponding to an average of the initial values, the initial value average calculated based on the first through (M)-th readout line averages; and calculating first through (M)-th weighted values corresponding to the first through (M)-th readout lines, the first through (M)-th weighted values calculated by dividing the first through (M)-th readout line averages by the initial value average.

16 . The method as claimed in claim 14 , wherein calculating the weighted values includes:
calculating an estimated initial value of a degraded pixel when the degraded pixel is detected; and calculating first through (M)-th weighted values corresponding to the first through (M)-th readout lines based on the initial values and the estimated initial value.

17 . The method as claimed in claim 16 , wherein the estimated initial value is estimated based on the initial values of non-degraded pixels adjacent to the degraded pixel.

18 . The method as claimed in claim 13 , wherein the initial values correspond to drive currents of the pixels in the initial state.

19 . The method as claimed in claim 13 , wherein the initial values correspond to drive voltages of the pixels in the initial state.

20 . The method as claimed in claim 13 , wherein a number of the readout lines is equal to a number of the data lines.

Assignees

• Samsung Display Co Ltd

Inventors

• Park Ji-Eun

Classifications

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G2310/08

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

• G09G2330/021

  Power management, e.g. power saving · CPC title

• G09G2320/0271

  Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title