Driving method and circuit for automatic voltage output of...

Details Driving method and circuit for automatic voltage output of... Driving method and circuit for automatic voltage output of...

2006-03-03

2009-10-20

Philogene, Haissa (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S099000, C345S094000, C345S082000, C345S077000, C345S208000, C315S169100, C315S169300, C315S291000, C315S360000

Reexamination Certificate

active

07605792

ABSTRACT:
Disclosed herein is a driving method and circuit for the automatic voltage output of an active matrix organic light emitting device, which is capable of resolving the non-uniformity of brightness between pixels. The circuit of the present invention includes timing generation means for generating a data drive start signal; sweep voltage generation means for generating a sweep voltage signal in response to output of the timing generation means; current level detection means for sensing an amount of current, which flows into pixels, based on output of the sweep voltage generation means, and outputting a sensing result to a data line; comparison means for comparing output of the current level detection means with a reference signal that determines stop timing for data writing, and outputting a comparison result; and data writing start/end control signal generation means for starting to operate in response to the output of the timing generation means, and generating data writing start and end control signals to a program stop line of a display panel. The invention can shorten data writing time and improve the precision of data writing. Furthermore, the present invention can simplify a data drive circuit and achieve the uniformity of brightness between pixels.

REFERENCES:
patent: 6795045 (2004-09-01), Jang et al.
patent: 7038651 (2006-05-01), Nitta et al.
patent: 7474288 (2009-01-01), Smith et al.
patent: 2005/0083270 (2005-04-01), Miyazawa
patent: 2007/0080905 (2007-04-01), Takahara
An article entitled, “New Pixel-Driving Scheme with Data-Line . . . ”, By M. Shimoda et al., IDW '02 pp. 239-242 (2002).

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