Driver circuit

Details Driver circuit Driver circuit

2005-03-29

2008-12-09

Awad, Amr (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

Reexamination Certificate

active

07463236

ABSTRACT:
A driver circuit to obtain a current to drive a light emitting device is reduced in a patterning area and improved in efficiency. A positive power supply voltage Vdd is applied to an anode of a white LED, while a voltage −0.5 Vdd from a −0.5 Vdd generation circuit is applied to a cathode of the white LED through an N-channel type MOS transistor. The −0.5 Vdd generation circuit generates the voltage −0.5 Vdd according to a clock Φ from a clock generation circuit. A voltage of 1.5 Vdd is applied between the anode and the cathode of the white LED, as equivalent to a prior art. Since N-channel type MOS transistors are heavily used in the −0.5 Vdd generation circuit, the driver circuit requires less patterning area to obtain the same amount of current to drive the LED as in the prior art. In addition, a parasitic capacitance is reduced to improve efficiency of the driver circuit.

REFERENCES:
patent: 6400210 (2002-06-01), Myono
patent: 6841948 (2005-01-01), Yoshida
patent: 2003/0169220 (2003-09-01), Tsuchiya et al.
patent: 2004/0041780 (2004-03-01), Ko
patent: 2004/0056605 (2004-03-01), Yoshida
patent: 2004/0227706 (2004-11-01), Sung
patent: 2005/0068272 (2005-03-01), Yoneda
patent: 2001-231249 (2001-08-01), None
patent: 555350 (2003-09-01), None

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