Light emitting display device
View Patent ↗A display device includes a pixel circuit unit comprising a plurality of pixels to display an image, a data driver to supply data signals to the pixel circuit unit, a scan driver to supply scan signals to the pixel circuit unit, a black/white transition detector to detect a degree of black/white transition of the image, a gamma corrector to adjust the data signal by providing a gamma value to the data driver, and a timing controller to apply control signals to the data driver and the scan driver, receive the degree of black/white transition from the black/white transition detector, and provide a corrected gamma control signal to the gamma corrector according to the degree of black/white transition.
1. A display device, comprising:
a pixel circuit unit comprising a plurality of pixels to display an image;
a data driver to supply data signals to the pixel circuit unit;
a scan driver to supply scan signals to the pixel circuit unit;
a black/white transition detector to detect a degree of black/white transition within the image;
a gamma corrector to adjust the data signal by providing a gamma value to the data driver; and
a timing controller to apply control signals to the data driver and the scan driver, receive the degree of black/white transition from the black/white transition detector, and provide a corrected gamma control signal to the gamma corrector according to the degree of black/white transition.
2. The device of claim 1 , wherein the black/white transition detector determines the degree of black/white transition by analyzing image data to be displayed by the pixel circuit unit.
3. The device of claim 2 , wherein the black/white transition detector determines the degree of black/white transition by calculating a total of image data in a horizontal direction and then determining a number of times the total in the horizontal direction exceeds a predetermined reference value in a vertical direction.
4. The device of claim 3 , wherein a plurality of predetermined reference values are used by the black/white transition detector.
5. The device of claim 1 , wherein the gamma corrector is a digital gamma unit existing in the data driver.
6. The device of claim 1 , wherein the pixels are organic light emitting elements.
7. The device of claim 1 , wherein the black/white transition detector determines the degree of black/white transition by calculating a total of the image data of an entire image.
8. A dynamic gamma control method in a display, comprising:
receiving image data of an image to be displayed on a screen;
outputting the image data onto the screen;
detecting a degree of black/white transition within the image; and
controlling luminance of the image output onto the screen by applying a gamma value that has been corrected according to the degree of black/white transition.
9. The method of claim 8 , wherein the degree of black/white transition is determined by analyzing the image data to be displayed by a pixel circuit unit.
10. The method of claim 9 , wherein a total of the image data in a horizontal direction is calculated and then the number of times the total in the horizontal direction exceeds a predetermined reference value in a vertical direction so as to determine the degree of black/white transition.
11. The method of claim 10 , wherein a plurality of predetermined reference values are used in the black/white transition detecting step.
12. The method of claim 8 , wherein the image is output onto the screen having organic light emitting elements.
13. The method of claim 8 , wherein the degree of black/white transition by calculating a total of the image data of an entire image.