Pixel circuit, active matrix apparatus and display apparatus

Details Pixel circuit, active matrix apparatus and display apparatus Pixel circuit, active matrix apparatus and display apparatus

2007-02-06

2007-02-06

Vo, Tuyet Thi (Department: 2821)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S090000, C345S082000, C345S077000, C345S104000

Reexamination Certificate

active

11140199

ABSTRACT:
A pixel circuit having a function of compensating for characteristic variation of an electro-optical element and threshold voltage variation of a transistor is formed from a reduced number of component elements. The pixel circuit includes an electro-optical element, a holding capacitor, and five N-channel thin film transistors including a sampling transistor, a drive transistor, a switching transistor, and first and second detection transistors. The sampling transistor samples and supplies an input signal from a signal line so as to be held into the holding capacitor. The driving transistor drives the electro-optical element with current in response to the held signal potential. The first and second detection transistors detect a threshold voltage of the drive transistor and supply the detected voltage into the holding capacitor in order to cancel an influence of the threshold voltage in advance.

REFERENCES:
patent: 6201270 (2001-03-01), Chen
patent: 6693388 (2004-02-01), Oomura
patent: 2003-255856 (2003-09-01), None
patent: 2003-271095 (2005-09-01), None

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