LASER DRIVING CIRCUIT, LASER DRIVING METHOD, AND DEVICE USING LASER LIGHT

摘要

A laser driving circuit, a laser driving method, and a device using laser light that can reduce speckle noise caused by laser light as coherent light are provided.;In the laser driving circuit that generates laser driving current for driving a plurality of laser light sources emitting laser light of different wavelengths on the basis of an input video signal, a high-frequency signal of a frequency exceeding the band of the video signal is superimposed on the laser driving current generated on the basis of the input video signal, whereby speckle noise caused by the laser light as coherent light is reduced.

主权项

1. A projection apparatus comprising:
a high-frequency superimposing section in a laser driving circuit, the high-frequency superimposing section is configured to receive a clock signal input from circuitry that is external to the laser driving circuit; and a signal processing system configured to generate an input video signal, the high-frequency superimposing section is configured to change amplitude of a high-frequency signal in accordance with a level of the input video signal.