Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Kenshi Tsuchiya0
Date of Patent
September 16, 2008
0Patent Application Number
112826480
Date Filed
November 21, 2005
0Patent Primary Examiner
Patent 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.
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