Light emission circuit

Details Light emission circuit Light emission circuit

1999-01-14

2000-08-29

Wong, Don

Electric lamp and discharge devices: systems

Current and/or voltage regulation

372 38, G05F 100

Patent

active

061113670

ABSTRACT:
A D/A converter outputs analog voltage in a range of 0 to 2 V in accordance with a digital value in a range of 0 to 31 outputted from a light emission control unit, and supplies the analog voltage to a voltage/current conversion unit. Driving current outputted from the voltage/current conversion unit is controlled on a 1 mA unit basis in a range of 0 to 31 mA in accordance with the digital value. Driving current outputted from a voltage/current conversion unit is controlled on a 4 mA unit basis in a range of 0 to 124 mA, and driving current outputted from a voltage/current conversion unit is controlled on a 20 mA unit basis in a range of 0 to 620 mA. The voltage/current conversion units are on-off controlled in accordance with range designation signals, respectively. Accordingly, the luminance of the LED can be controlled in a wide range and accurately even in a low luminance level.

REFERENCES:
patent: 4611117 (1986-09-01), Seibert et al.
patent: 4618257 (1986-10-01), Bayne et al.
patent: 5742133 (1998-04-01), Wilhelm et al.
patent: 5822346 (1998-10-01), Arai
patent: 5978124 (1999-11-01), Maekawa et al.

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