Light source unit and display device having luminance...

Details Light source unit and display device having luminance... Light source unit and display device having luminance...

2007-04-24

2007-04-24

Luu, Thanh X. (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C345S081000, C345S207000, C345S690000, C315S309000

Reexamination Certificate

active

10673369

ABSTRACT:
A light source unit includes a light source having LED chips for emitting different colors of light and an optical sensor for detecting light from a light mixer. A light source control section controls by feedback control luminance of each of the LED chips according to values detected by the optical sensor. The light source unit also includes a temperature control section for controlling the temperature of the light source. The temperature control section is a feedback control system. Keeping the light source at a constant temperature allows suppressing spectrum changes of the LED chips with temperature, thereby suppressing changes in the luminance and chromaticity of the light source unit.

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patent: 2000-301748 (2000-10-01), None
patent: 2001-0022668 (2001-03-01), None

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