Low power source driver for liquid crystal display

Details Low power source driver for liquid crystal display Low power source driver for liquid crystal display

2006-05-23

2006-05-23

Wu, Xiao (Department: 2674)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S100000

Reexamination Certificate

active

07050033

ABSTRACT:
Disclosed is a source driver for receiving an input voltage and generating an output voltage to drive a data line in a liquid crystal display apparatus. In the source driver, first and second P-channel MOS transistors are together used as a primary source follower to trace the input voltage thereby eliminating the body effect and keeping the loading charge loss constant. First and second N-channel MOS transistors are used, as a secondary source follower. A capacitor is used for boosting the voltage of the drain of the first N-channel MOS transistor on the level of at least the input voltage plus the threshold voltage of the N-channel MOS transistor. In addition, an extra switch is used to reach the accurate output voltage when the output voltage is approaching the input voltage.

REFERENCES:
patent: 6075524 (2000-06-01), Ruta
patent: 6127997 (2000-10-01), Tsuchi
patent: 6351163 (2002-02-01), Yoshizawa et al.
patent: 6664943 (2003-12-01), Nakajima et al.
Saito et al.; “17.3: A 6-Bit Digital Data Driver for Color TFT-LCDs”; SID 95 Digest, pp. 257-258, (1995).

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