Light-emitting diode drive circuit, light source device, and...

Details Light-emitting diode drive circuit, light source device, and... Light-emitting diode drive circuit, light source device, and...

2011-01-04

2011-01-04

Kumar, Srilakshmi K (Department: 2629)

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

C345S044000

Reexamination Certificate

active

07864142

ABSTRACT:
A display device includes a light source device and an image display panel operable to display an image using light emitted from the light source device. The light source device includes a plurality of series drive circuits each including a predetermined number of series-connected light-emitting diodes, a constant-current circuit outputting a constant amount of current to one of the plural series drive circuits serving as a reference, the plural series drive circuits being connected in parallel with the current output, a current mirror circuit operable to allow the same amount of current to flow through the plural series drive circuits, and a voltage dropping circuit operable to cause a voltage drop of a predetermined level in the series drive circuit serving as the reference, the voltage dropping circuit being disposed in series with the light-emitting diodes forming the series drive circuit serving as the reference.

REFERENCES:
patent: 6597119 (2003-07-01), Ito
patent: 2003-100472 (2003-04-01), None
patent: 2004-039290 (2004-02-01), None
patent: 2004-319583 (2004-11-01), None

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