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A new estimation method for image sticking has been developed that can effectively eliminate the influence by the difference in long-range non-uniformity pattern. An 8×8 chessboard pattern was used for selective degradation, and normalization based on extracted reference and coefficient of variation were adopted for better results.

We propose a new hybrid pixel driving method that combines conventional digital driving with analog compensation for the declining electrical performance that occurs as OLEDs age. Image uniformity, and thus display lifetime, is improved by directly measuring the variation in OLED voltage at each pixel for a given OLED current level and then controlling the voltage drop across its driving TFT of an individual pixel.

Though AMOLED display has been expected as the next generation ideal flat panel display because of its excellent image quality, the AMOLED market has been still limited. This means that AMOLED has not had sufficient competitiveness with LCD yet. There are two critical problems for AMOLED to overcome to compete with LCD. One is Mura problem caused by TFT characteristics deviation in the backplane and the other is short life time of image sticking. In this paper, we will review various approaches to overcome these two critical problems and discuss the practicality of the methods.

An 8-bit coarse digital-to-analog converter (DAC), which adopts both array and tree-type decoders, is combined with a 2-bit fine interpolation DAC to reduce RC time delay and die area of a column driver for LCD-HDTV applications. Error amplifiers drive a pair of column lines in the output buffer to realize rail-to-rail voltage swing with a high slew rate. The design has been fabricated in 0.3 μm LV-HV CMOS technology.