A True 10-bit Data Driver LSI for HDTV TFT-LCDs

Jin-Ho KIM  Oh-Kyong KWON  Byong-Deok CHOI  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E89-C   No.5   pp.585-590
Publication Date: 2006/05/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e89-c.5.585
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Fundamental and Application of Advanced Semiconductor Devices)
Category: Si Devices and Processes
Keyword: 
10-bit gray scale,  HDTV,  TFT-LCD,  data driver,  LCD TV,  

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Summary: 
We present our recent results of the 10-bit data driver LSI for 42-inch diagonal TFT-LCD TV with full HD format. To develop data driver LSIs for a true 10-bit TFT-LCD TV with full HD (19201080) format, small chip area, low power consumption, and output uniformity between channels are key problems that must be solved. By applying a two-stage DAC which combines 8-bit resistor-string DAC and 2-bit binary weighted capacitor DAC, the area increase is limited to only 30% compared to the area of 8-bit resistor-string DAC. The output deviation between channels is successfully limited within 5 mV and the driver LSI with 414 outputs consumes the maximum total current of 16 mA when driving 42-inch HDTV panel. We confirmed that the picture with 10-bit shades of gray is much more natural than that with 8-bit shades of gray.