Active matrix organic electroluminescent display device

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

C345S077000

Reexamination Certificate

active

07812793

ABSTRACT:
An active matrix electroluminescent display device uses a stepped voltage waveform to the input of the pixel, the stepped voltage waveform being voltage-shifted by a previously stored pixel drive voltage before application to the gate of a drive transistor. The level of the voltage shift determines the duty cycle with which the display element is driven, and thereby controls the grey level output. The height of the steps in the stepped voltage waveform is greater than the voltage width of linear operating region of the drive transistor, so that a selected step of the stepped waveform defines a transition from the drive transistor between fully on and fully off. In this way, the drive transistor is never driven in the linear region.

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A. Yumoto et al. “Pixel-Driving Methods for Large-Sized Poly-Si AM-OLED Displays”, Asia Display/IDW'01, Proceedings of the 21st International Display Research Conference in Conjunction With the 8th International Display Workshops, Nagoya, Japan, Oct. 16-19, 2001, vol. CONF. 21/8, Oct. 16, 2001, pp. 1395-1398.

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