Active matrix OLED driving circuit using current feedback

Details Active matrix OLED driving circuit using current feedback Active matrix OLED driving circuit using current feedback

2011-01-25

2011-01-25

Lao, Lun-Yi (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S077000, C345S082000, C345S083000, C345S204000, C315S169300

Reexamination Certificate

active

07876292

ABSTRACT:
An active matrix organic light emitting diode AMOLED driving circuit using current feedback that ensures the uniformity of brightness in pixels of a flat panel display and shortens the time required to input accurate current to respective pixels in the driving circuit.The prevent invention provides an AMOLED driving circuit using current feedback, comprising: a current digital-to-analog converter outputting a current corresponding to input digital data; a first differential amplifier connected to the current digital-to-analog converter and controlling the input data current and a driving current of a driving transistor of a pixel circuit to be identical to each other; a current mirror mirroring driving current of an organic light emitting diode of the pixel circuit to an input side of the first differential amplifier; and a second differential amplifier coupled to the current mirror and controlling charge and discharge speeds of parasitic capacitance of the pixel circuit.

REFERENCES:
patent: 5266936 (1993-11-01), Saitoh
patent: 5721563 (1998-02-01), Memida
patent: 5748160 (1998-05-01), Shieh et al.
patent: 6433488 (2002-08-01), Bu
patent: 6480178 (2002-11-01), Itakura et al.
patent: 6528951 (2003-03-01), Yamazaki et al.
patent: 2004/0085086 (2004-05-01), LeChevalier

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