A Driving Scheme For 7 Inch VGA μc-Si AMOLED

Organic light-emitting diode(OLED)displays have attracted public attention due to their self-light emitting, high brightness,wide viewing angle and low power consumption.In recent years, microcrystalline silicon TFT(thin film transistor) which has excellent uni-formity and moderate mobility has become a research issue in AMOLED technology. In this paper, we develope a peripheral driving scheme by analyzing microcrystalline silicon TFT AMOLED characteristics in the development.Based on the sufficient study and analysis of microcrystalline silicon TFT pixel cir-cuit,we drive AMOLED by the method of analog gray scale and voltage-type modulation with LCD driver IC; In order to eliminate the impact of polarity reversal ,we bind source drivers by separating the even and the odd pins of AMOLED.This paper presents an image scaling algorithm for the panel in low resolution .We adopt adaptive algorithm based on Newton's binomial in horizontal interpolation and bilin-ear algorithm in vertical interpolation. The needed cache capacity can be reduced to one line by timing signal control,and saving 75% of storage space compared with computing adaptive interpolation in two dimension.Meanwhile the algorithm maintains good image scaling effect on the image edge and high PSNR.In order to avoid gray error because the storage capacitor is not completely charged, we make use of the "blank " time which stems from image scaling down to extend time for writing panel, avoiding off-chip SRAM. For the source images with common resolution ,the program can achieve time delay of 33μs.Timing simulation and hardware verification results demonstrate that the scheme adapts to the dynamic video display on microcrystalline silicon TFT AMOLED and reduces the hardware overhead significantly.