Devices and methods for electroluminescent display

Details Devices and methods for electroluminescent display Devices and methods for electroluminescent display

2003-08-22

2008-12-09

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C315S169300

Reexamination Certificate

active

07463222

ABSTRACT:
In an active matrix electroluminescent display device, a storage capacitor (24) is provided for storing a voltage to be used for addressing a drive transistor (22). A discharge photodiode (27) is provided for discharging the storage capacitor in dependence on the light output of the display element, and an input data voltage applied to the pixel is changed by an amount corresponding to the threshold voltage of the drive transistor. The changed data voltage is applied between the gate and source of the drive transistor.In this device the initial voltage on the gate of the drive transistor is modified so as to remove the dependency of the light output on the threshold voltage, so that threshold voltage variations can be tolerated.

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David A. Fish; A Comparison of Pixel Circuits for Active Matrix Polymer/Organic LED Displays; SID 02 Digest, May 2002; pp. 968-971.

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