Light emitting element drive apparatus, planar illumination...

Details Light emitting element drive apparatus, planar illumination... Light emitting element drive apparatus, planar illumination...

2010-04-28

2011-12-20

Nguyen, Jimmy H (Department: 2629)

Computer graphics processing and selective visual display system

Display driving control circuitry

Intensity or color driving control

C345S076000, C345S082000, C345S102000

Reexamination Certificate

active

08081199

ABSTRACT:
A light emitting element drive apparatus that drives light emitting elements reduces power loss caused by variability between forward voltage drops of the light emitting elements. A plurality of voltage applying sections (1, 32and33; and2, 34and35) generate application voltages based on a detection voltage determined based on a maximum forward voltage drop among the forward voltage drops of the light emitting element arrays (11to14), and apply the generated application voltages to the light emitting elements (11to14). Switching sections (30and31) switch between a plurality of voltage applying sections (1, 32and33; and2, 34and35) to which the light emitting element arrays (11to14) individually connect. Controlling sections (40to42) control the switching sections (30and31) to switch connection to minimize the difference between forward voltage drops of light emitting element arrays (11to14).

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