Display apparatus and method of driving the same
AssigneeSamsung Display Co., Ltd.
InventorsByung-Sik KOH, Si-Duk SUNG, Kwang-Sub SHIN, Jong-Hwa PARK
Life of this patent
Estimating the term…
Abstract
In a display apparatus and a driving method thereof, image data corresponding to plural different positions of a display panel are added to each other, and a sum of the image data of a present frame is compared with a sum of the image data of a previous frame to determine whether an image displayed on the display panel is a still image or not. While a still image is displayed, brightness of the display panel is gradually lowered. Accordingly, the display panel may prevent occurrence of afterimages and deterioration of organic electroluminescent light emitting devices, as well as reduce power consumption.
Claims13
A display apparatus comprising:
- a display panel that displays an image;
- a timing controller that processes image data, the timing controller comprising:
- a panel controller that outputs the image data in synchronization with a first control signal;
- and
- a brightness controller that detects a variation of the image according to a sum of gray scale values of the image data (hereinafter, referred to local image data) corresponding to selected plural positions of the display panel, and outputs a second control signal to control a brightness of the display panel;
- and
- a panel driver that drives the display panel in response to the first control signal and the image data, and controls a brightness of the display panel in response to the second control signal.
A method of driving a display apparatus, comprising:
- adding gray scale values of image data corresponding to selected plural positions of the display panel for a plurality of frames, so as to determine sums of the gray scale values of the image data for each frame of the plurality of frames;
- comparing a sum of the image data obtained from a previous frame with a sum of the gray scale values of the image data obtained from a present frame to calculate a difference value between the previous frame and the present frame;
- comparing the difference value with a predetermined reference value;
- increasing a count value when the difference value is equal to or less than the reference value, and resetting the count value when the difference value is greater than the reference value, wherein the count value corresponds to a displaying time of an image displayed on a display panel;
- generating a control signal based on brightness data corresponding to the count value;
- and
- controlling a brightness of the display panel based on the control signal.
Dependencies are inferred from the claim text.