Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Reexamination Certificate
2011-03-22
2011-03-22
Vo, Tuyet Thi (Department: 2821)
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
C345S211000, C345S212000, C345S082000, C345S102000
Reexamination Certificate
active
07911464
ABSTRACT:
The pixels of an active matrix display device have a current-driven light emitting display element, a drive transistor for driving a current through the display element, a storage capacitor for storing a pixel drive voltage to be used for addressing the drive transistor, a light-dependent device for detecting the brightness of the display element, and driver circuitry for providing data signals to the pixel external to the pixel array. This provides a pixel with optical feedback to compensate for display element ageing. The driver circuitry has a processing means for processing the feedback brightness signals and derives from them a threshold voltage for the drive transistor of the pixel as well as information relating to the performance of the display element, for ageing compensation.
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Childs Mark J.
Fish David A.
Knapp Alan G.
Young Nigel D.
Koninklijke Philips Electronics , N.V.
Vo Tuyet Thi
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