Laser driving apparatus

Details Laser driving apparatus Laser driving apparatus

2009-05-13

2010-11-23

Harvey, Minsun (Department: 2828)

Coherent light generators

Particular temperature control

C372S036000

Reexamination Certificate

active

07839907

ABSTRACT:
Laser driving apparatus in which a temperature is controlled such that an optical output is maximum, even when a laser device using an optical wavelength conversion element is used in a backlight source of a liquid crystal display that adjusts light dynamically. Current detection section5detects an average value of a driving current by which laser device1is pulse-driven. Optical detection section3detects an average value of an optical output from laser device1. Efficiency detection section9calculates a ratio of an output from optical detection section3to an output from current detection section5. A temperature setting value at which an efficiency value which is a result of the computation is maximum is provided to temperature control section7and a temperature of nonlinear optical crystal12of laser device1is controlled, whereby laser device1is driven such that the optical output from laser device1is always maximum.

REFERENCES:
patent: 5168503 (1992-12-01), Maeda
patent: 5265115 (1993-11-01), Amano
patent: 5341388 (1994-08-01), Masuda et al.
patent: 2008/0175286 (2008-07-01), Kamijima
patent: 2001-168439 (2001-06-01), None
patent: 2003-174222 (2003-06-01), None
patent: 2003-298180 (2003-10-01), None

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