Laser driving circuit, laser driving method, and device using laser light
US9813682B2 · kind B2 · utility
0Cited by
4References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Nov 10, 2016 |
| Grant date | Nov 7, 2017 |
| Priority date | — |
| Expiry date | Nov 10, 2036 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S2301/02
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.