Organic light emitting display device and driving method thereof

Patent metadata

Field	Value
Publication number	US-2016343302-A1
Application number	US-201615156227-A
Country	US
Kind code	A1
Filing date	May 16, 2016
Priority date	May 20, 2015
Publication date	Nov 24, 2016
Grant date	—

Abstract

A display device includes a display unit including pixels, a memory to store degradation data of the pixels, a group-setting portion to classify the pixels into degradation regions according to a degradation degree and based on the degradation data, perform a contour-simplifying process with respect to the degradation regions, classify the degradation regions into labeling regions according to proximity of adjacent ones of the degradation regions, and set one of the degradation regions as a reference region, a sensor to sense electric characteristics of the degradation regions and the reference region as they separately emit light, a compensation amount controller to compare the electric characteristics of the degradation regions with electric characteristics of the reference region, and calculate a per-position compensation data corresponding to a position of the labeling regions, and a converter to convert a first image data into a second image data based on the per-position compensation data.

First claim

What is claimed is:

1 . An organic light emitting display device, comprising:
a display unit comprising a plurality of pixels; a memory configured to store degradation data of the pixels during display operation; a group-setting portion configured to:
classify the pixels into a plurality of degradation regions according to a degradation degree and based on the degradation data;
perform a contour-simplifying process with respect to each of the degradation regions;
classify the degradation regions into a plurality of labeling regions according to proximity of adjacent ones of the degradation regions; and
set one of the degradation regions as a reference region;
a sensor configured to sense electric characteristics of the degradation regions and the reference region as the regions separately emit light; a compensation amount controller configured to:
compare the electric characteristics of each of the degradation regions with electric characteristics of the reference region; and
calculate a per-position compensation data corresponding to a position of each of the labeling regions; and
a converter configured to convert a first image data into a second image data based on the per-position compensation data.

2 . The organic light emitting display device of claim 1 , wherein the group-setting portion is further configured to remove distortion caused by the contour-simplifying process by masking each of the labeling regions.

3 . The organic light emitting display device of claim 1 , wherein the sensor is further configured to sense electric characteristics of a power source supplied to the display unit when the pixels in each of the degradation regions and in the reference region emit light of red, green, and blue colors.

4 . The organic light emitting display device of claim 1 , wherein driving transistors of the pixels are configured to be controlled to be driven in a linear mode when the electric characteristics are sensed.

5 . The organic light emitting display device of claim 1 , wherein the sensor is configured to sense the electric characteristics several times by varying a power source to output a different voltage for each of the several times.

6 . The organic light emitting display device of claim 1 , wherein the compensation amount controller is further configured to:
calculate per-region compensation data for each of the degradation regions so that a current amount through the pixels in the degradation regions is similar to a current amount through the pixels in the reference region; and apply a positional deviation compensation value depending on a position of each of the labeling regions in the display unit to the per-region compensation data to calculate the per-position compensation data.

7 . The organic light emitting display device of claim 6 , wherein the compensation amount controller is further configured to calculate the per-region compensation data and the per-position compensation data with reference to a compensation estimation curve relating a degradation-compensating amount to a corresponding degradation degree.

8 . The organic light emitting display device of claim 1 , further comprising:
a scan driver configured to transmit scan signals to the pixels through scan lines; and a data driver configured to transmit data signals the pixels through data lines.

9 . A driving method of an organic light emitting display device, the method comprising:
storing degradation data of each of a plurality of pixels during display operation; classifying the pixels into a plurality of degradation regions according to a degradation degree of the pixels based on the degradation data; performing a contour-simplifying process for each of the degradation regions; classifying the degradation regions into a plurality of labeling regions according to proximity of adjacent ones of the degradation regions; setting one of the degradation regions as a reference region; emitting light at each of the degradation regions and the reference region separately; sensing electric characteristics of the degradation regions and the reference region; comparing the electric characteristics of each of the degradation regions with electric characteristics of the reference region; calculating a per-position compensation data corresponding to a position of each of the labeling regions; and converting a first image data into a second image data based on the per-position compensation data.

10 . The driving method of the organic light emitting display device of claim 9 , further comprising removing distortion due to the contour-simplifying process by masking each of the labeling regions.

11 . The driving method of the organic light emitting display device of claim 9 , wherein the sensing of the electric characteristics comprises:
causing pixels in each of the degradation regions and in the reference region to emit light of red, green, and blue colors; and sensing electric characteristics of a power source supplied to the display device.

12 . The driving method of the organic light emitting display device of claim 9 , wherein the calculating of the per-position compensation data comprises:
calculating per-region compensation data for each of the degradation regions so that a current through the pixels in the degradation regions is similar to a current amount through the pixels in the reference region; and applying a positional deviation compensation value depending on a position of the labeling regions in the display device to the per-region compensation data to calculate the per-position compensation data.

13 . The driving method of the organic light emitting display device of claim 12 , wherein the calculating of the per-position compensation data comprises calculating the per-region compensation data and the per-position compensation data with reference to a predetermined compensation estimation curve that relates a degradation-compensating amount to a corresponding degradation degree.

Assignees

• Samsung Display Co Ltd

Inventors

• Han Sang Myeon
• Jin Dong Sup
• Seol Chang Kyu
• Lee Baek Woon
• Kong Jun Jin
• Son Hong Rak

Classifications

• G09G2300/0452

  Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components · CPC title

• G09G3/3266

  Details of drivers for scan electrodes · CPC title

• G09G3/3275

  Details of drivers for data electrodes · CPC title

• 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