Method of compensating channel offset voltage for column...

Details Method of compensating channel offset voltage for column... Method of compensating channel offset voltage for column...

2007-10-29

2009-02-24

Jeanglaude, Jean B (Department: 2819)

Coded data generation or conversion

Converter compensation

C341S144000, C341S119000, C341S120000

Reexamination Certificate

active

07495590

ABSTRACT:
A technique for removing vertical stripe artifacts generated in a Liquid Crystal Display (LCD) panel, more particularly a technique for compensating for and removing an inter-channel offset voltage of a column driver, which causes the vertical stripe artifacts, is disclosed. An offset voltage generated in each channel for driving each pixel of the LCD panel is detected for a whole signal path and offset voltages detected for all channels are compared and extracted according to a given timing sequence by a common signal comparator, thereby preventing the offset of the detection comparator and reducing a chip size of the column driver in contrary to the prior art. Moreover, an inter-channel offset voltage is detected in a digital circuit mode, thereby compensating for process variations in a semiconductor chip manufacturing process in circuit terms.

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patent: 7199745 (2007-04-01), Tachibana et al.
patent: 2008/0122671 (2008-05-01), Wang et al.

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