Timing controller, driving method thereof, and display device using the same

摘要

A timing controller includes a logo detecting unit configured to compare a plurality of frames to detect a logo region, an edge detecting unit configured to detect an edge, corresponding to a boundary between the logo region and an external region of the logo region, from the logo region by using a change amount of brightness between the logo region and the external region, a brightness compensating unit configured to reduce a brightness of the logo region including the edge, and an output unit configured to output image data whose a brightness is compensated for by the brightness compensating unit.

主权项

1. A timing controller of an Organic Light Emitting Diode (OLED) display, comprising:
a processor with circuit elements configured to: compare a plurality of frames to detect a logo region, wherein each frame is divided into a plurality of pixel blocks arranged into an array, with corresponding average accumulation pixel data value of each of the plurality of pixel blocks being stored to corresponding block memories; detect an edge from the pixel blocks of only the logo region which corresponds to a boundary between the logo region and an external region of the logo region, using an infinite impulse response (IIR) filter to determine a change amount of brightness corresponding to the average accumulation pixel data values between the pixel blocks of logo region only and the pixel blocks of external region, wherein the determination of the change amount of brightness corresponding to the average accumulation pixel data values between the pixel blocks of logo region only and the pixel blocks of external region is according to an equation:
Sn=Sn−1·k+An·(1−k) wherein An denotes Block_Count, k is 0.06 (parameter), and Sn−1 denotes an average value of previous data, and Block_Count denotes the accumulation pixel value stored in the corresponding block memories; reduce a brightness of the logo region only comprising the edge; and output image data to the OLED display whose brightness is compensated for by reducing image-sticking caused by the logo region.