Current load device and method for driving the same

Details Current load device and method for driving the same Current load device and method for driving the same

2007-04-24

2007-04-24

Hjerpe, Richard (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S211000, C345S077000, C315S169300

Reexamination Certificate

active

10228632

ABSTRACT:
This invention provides a precise current load device. A cell includes a power supply line, a ground line, first and second voltage supply lines, a signal line, first, third and fourth control lines, first to fourth switches, a p-type TFT, a capacitance element, and a current load element. A source of the p-type TFT is connected to the power supply line, one terminal of the current load element is connected to the ground line, the first switch is connected between the signal line and a drain of the p-type TFT, the second switch is connected between the drain and the gate of the p-type TFT, the third switch is connected between the drain of the p-type TFT and the current load element, and the fourth switch is connected between the voltage supply line and the current load element.

REFERENCES:
patent: 6373454 (2002-04-01), Knapp et al.
patent: 6806857 (2004-10-01), Sempel et al.
patent: 2001/0015626 (2001-08-01), Ozawa
patent: 1381032 (2002-11-01), None
patent: 11-282419 (1999-10-01), None
patent: WO 99/38148 (1999-07-01), None
R.M.A. Dawson, et al. The Impact of the Transient Response of Organic Light Emitting Diodes on the Deisgn of Active Matrix OLED Displays. pp. 875-878. Digest of IEDM 1998.
European Office Action Jun. 14, 2004.
Chinese Office Action dated May 13, 2005 for corresponding Chinese application 02132171.X.

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