Active drive type light emitting display device and drive...

Details Active drive type light emitting display device and drive... Active drive type light emitting display device and drive...

2007-07-24

2007-07-24

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

C345S076000

Reexamination Certificate

active

10770394

ABSTRACT:
In a light emitting display device which is actively driven by TFTs, light emitting display pixels are driven efficiently. In a light emitting display panel10, a large number of light emitting display pixels10aare arranged in a matrix pattern and measuring pixels10bare arranged forming a line along one dataline. A constant current is supplied from a constant current source11to the measuring pixels10b, and the forward voltage VF of the EL element in the measuring pixel10bis obtained by a voltage detecting terminal12.The value of the drive voltage supplied to the light emitting display pixels10ais controlled based on the forward voltage VF. Thus, a drive TFT (Tr2) constructing the light emitting display pixel10acan drive an EL element E1in the state where a drop voltage (VD) of the degree by which a constant current characteristic can be ensured is ensured, and a power loss generated in the drive TFT can be effectively restrained.

REFERENCES:
patent: 4782340 (1988-11-01), Czubatyj et al.
patent: 5952789 (1999-09-01), Stewart et al.
patent: 6943759 (2005-09-01), Tam
patent: 7042427 (2006-05-01), Inukai
patent: 7079092 (2006-07-01), Tanghe et al.
patent: 2002/0021293 (2002-02-01), Tam
patent: 2002/0047565 (2002-04-01), Nara et al.
patent: 2003/0234755 (2003-12-01), Koyama
patent: 2004/0041756 (2004-03-01), Henmi et al.
patent: 2004/0263445 (2004-12-01), Inukai et al.
patent: 2005/0024298 (2005-02-01), Tam
patent: 7-36409 (1995-02-01), None

Affiliated with

Also associated with

Rating

Active drive type light emitting display device and drive... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Active drive type light emitting display device and drive..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Active drive type light emitting display device and drive... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3725681