Organic light-emitting diode display

Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix

Reexamination Certificate

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Details

C315S169300, C345S211000, C345S212000, C345S213000

Reexamination Certificate

active

07091940

ABSTRACT:
A technique to reduce the rate of increase in threshold voltage, i.e. degradation, of an amorphous silicon TFT driving an OLED. A first supply voltage is supplied to a drain of the TFT when a first control voltage is applied to a gate of the TFT to activate the TFT and drive the OLED. However, a second, lower supply voltage is supplied to the drain of the TFT when a second control voltage is applied to the gate of the TFT to deactivate the TFT and turn off the OLED, whereby a voltage differential between the drain and the source when the second control voltage is applied to the gate is substantially lower said first supply voltage. This reduces degradation of the TFT. According to one feature of the present invention, when the TFT is turned off by the absence of voltage applied to its gate, the voltage at the drain of the TFT is reduced to approximately zero to minimize the voltage differential between the drain and the source.

REFERENCES:
patent: 6229506 (2001-05-01), Dawson et al.
patent: 6229508 (2001-05-01), Kane
patent: 6307322 (2001-10-01), Dawson et al.
patent: 6611107 (2003-08-01), Mikami et al.
patent: 6680580 (2004-01-01), Sung
patent: 6731276 (2004-05-01), Ishizuka
patent: 6738034 (2004-05-01), Kaneko et al.
patent: 6753654 (2004-06-01), Koyama
patent: 6858989 (2005-02-01), Howard
patent: 2002/0011796 (2002-01-01), Koyama
Japanese Technology Evaluation Center Panel, Display Technologies in Japan, Jun. 1992, Loyola College in Maryland, Chapter 5: Amorphous Silicon: The Dominant Active Matrix Technology.

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