Light source system and projector based on Bragg grating

Abstract

The invention discloses a light source system and a projector based on a Bragg grating. The light source system comprises a light source, the Bragg grating and a wavelength tuning device, wherein the light source is used for outputting visible light to the Bragg grating, the Bragg grating is provided with at least two center reflected wavelengths, and light with at least one of the two center reflected wavelengths is selected from the input visual light and is output; and the wavelength tuning device is used for setting the selected center reflected wavelength of the Bragg grating. The center reflected wavelength of the Bragg grating is set through the wavelength tuning device, so that the Bragg grating can select and output the light of different wavelengths so as to reduce the coherence of the light.

Description

technical field [0001] The invention relates to the technical field of projection, in particular to a Bragg grating-based light source system and a projector. Background technique [0002] At present, the use of many devices requires a light source, such as liquid crystal display screens, projectors and other devices that need to present images to people through light. In order to enable users to experience good visual effects from the above-mentioned equipment, people have conducted a lot of research on how and what light is emitted by the light source in the equipment, and began to use optical components to process the light source and then output it. These components for processing and outputting light are collectively referred to as the light source system. [0003] Taking a projector as an example, its light source system is generally divided into two types. One is an ultra-high pressure mercury lamp as a light source. The life of this bulb is generally between 2000 ho...

AI Technical Summary

Problems solved by technology

[0003] Taking a projector as an example, its light source system is generally divided into two types. One is an ultra-high pressure mercury lamp as a light source. The life of this bulb is generally between 2000 hours and 4000 hours. Weakened, the problem of reduced projected image quality, and the bulb as the only consumable of the projector, its price is relatively high, so the cost of the user to use the projector is relatively high; the other is the laser light source, which mainly uses the ever-growing laser diode, which has Advantages of low energy consumption, high brightness, long life, pure color, high color gamut and switch at any time

However, the light output by the laser light source is highly coherent, and interference occurs when it is irradiated on the projection screen, which is likely to cause the problem of speckle

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