Digital driver for 2-inch LTPS AM-OLED displays

Abstract

For LTPS AM-OLED displays, the spatial variation in the electrical characteristics of polysilicon TFTs will cause non-uniform pixel brightness and poor grayscale accuracy. The technological solution for this problem will open up the larger size application of LTPS AM-OLED displays. In this paper, a digital driver employing a FPGA device is designed to serve 2-inch color LTPS AM-OLED displays with 128× (160×3) resolution. A digital method of simultaneous address-display (SAD) and the digital visual interface (DVI) are introduced in the driving scheme. 100% display per, ratio can be obtained. Moving image with 16 grayscales is realized and has good image uniformity.

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