An LCD driver with on-chip frame buffer and 3 times image compression

Star Sung; Jacques Baudia

doi:10.1117/12.765712

28 January 2008 An LCD driver with on-chip frame buffer and 3 times image compression

Star Sung, Jacques Baudia

Proceedings Volume 6807, Color Imaging XIII: Processing, Hardcopy, and Applications; 68070H (2008) https://doi.org/10.1117/12.765712
Event: Electronic Imaging, 2008, San Jose, California, United States

Abstract

An LCD Driver with on-chip frame buffer and 3 times image compression codec reaching visually lossless image quality is presented. The frame buffer compression codec can encode and decode up to eight pixels in one clock cycle. Integrating a whole frame buffer with RGB=888 bits into the display driver sharply reduces power dissipated between the IO pad and PCB board at a cost of 50% IC die area increase. The existing working chip (STE2102, a ram-less LCD Driver with die size of 170mm x 12mm) is manufactured by ST Micro 0.18μm high voltage CMOS process. A new chip design with on-chip frame buffer SRAM and 3 times compression codec supporting QVGA (320x240) is completed which reduces the frame buffer SRAM density and area by a factor of ~3.0 times and cuts the power consumption of the on-chip SRAM frame buffer by ~9.0 times of which 3 times is contributed by less capacitive bit line load and another 3 times from data rate reduction from image compression. The compression codec having 25K gates in encoder and 10K in decoder accepts both YUV and RGB color formats. An on-chip color-space-conversion unit converts the decompressed YUV components with 420, 422 and 444 formats to be RGB format before driving out to be displayed. The high image quality is achieved by applying some patented proprietary compression algorithms including accurate prediction in DPCM, a Golomb-Rice like VLC coding with accurate predictive divider and an intelligent bit rate distribution control.

Citation Download Citation

Star Sung and Jacques Baudia "An LCD driver with on-chip frame buffer and 3 times image compression", Proc. SPIE 6807, Color Imaging XIII: Processing, Hardcopy, and Applications, 68070H (28 January 2008); https://doi.org/10.1117/12.765712

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KEYWORDS

Image compression

LCDs

Image quality

Clocks

Computer programming

RGB color model

Very large scale integration

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