Surface light source control device

Active solid-state devices (e.g. – transistors – solid-state diode – Incoherent light emitter structure – In combination with or also constituting light responsive...

Reexamination Certificate

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Details

C257S059000, C257S072000, C257S257000, C257SE27125

Reexamination Certificate

active

07425728

ABSTRACT:
A surface light source control device has a plane light source control circuit for setting a current amount to a plurality of diode arrays. The light source control circuit comprises a constant current circuit for holding currents respectively flowing in the plurality of diode arrays constant at the same current value; and a power supply voltage control loop for selecting a notable diode array with a minimum reference voltage, among reference voltages appearing at each terminal of the plurality of diode arrays, appeared thereon to select the minimum reference voltage by a voltage selection circuit and adjusting a common power supply voltage so that the reference voltage becomes a prescribed value.

REFERENCES:
patent: 5351106 (1994-09-01), Lesko et al.
patent: 2004/0227749 (2004-11-01), Kimura
patent: 2005/0105009 (2005-05-01), Dunn et al.
patent: 11-298044 (1999-10-01), None

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