Projection light source and projection device using same

Abstract

The invention provides a projection light source and a projection device. The projection light source comprises a light source and a color wheel. The light source is used for generating exciting light. The color wheel faces the light source, rotates around a rotating shaft, and comprises a plurality of optical wavelength conversion regions which are arranged on a propagation path of the exciting light source to receive the exciting light and to convert the exciting light into fluorescence corresponding to the optical wavelength conversion regions. The fluorescence generates a colored light sequence of a periodic time sequence along with the rotation of the color wheel. The exciting light generated by the light source forms light spots on the color wheel, and the projection sizes of the light spots in the direction of motion of the color wheel are larger than those of the light spots in at least another direction of the color wheel. According to the projection light source, the position and the direction of the exciting light projected onto the color wheel are regulated, so that the fluorescence efficiency of the color wheel can be improved, the temperature of a light spot region on the color wheel can be reduced, the efficiency of output light of the projection light source can be improved, and the stability of the color temperature and the chromaticity of output light beams can be maintained.

Description

technical field [0001] The invention relates to the field of projection technology, in particular to a projection light source using a fluorescent pink wheel and a projection device using the projection light source. Background technique [0002] As computer peripherals are gradually becoming mobile, projector equipment is also developing towards lightweight, which has given birth to miniature projectors. The pico projector is mainly integrated with mobile devices, embedded in mobile phones, digital cameras, tablet computers and other devices, and powered by the battery of the mobile device, so that it can be carried around in a true sense. [0003] At present, the UHP (Ultra High Power) light source commonly used in ordinary projectors cannot be applied to micro-projectors due to reasons such as size, power consumption, and heat dissipation. Therefore, it is necessary to develop a micro-projection light source to cooperate with it. [0004] Compared with traditional UHP li...

AI Technical Summary

Problems solved by technology

Studies have shown that as the temperature rises, the quantum efficiency of the phosphor will decrease, resulting in a decrease in the emitted light of the phosphor, and a change in the wavelength of the radiation, which will cause changes in color temperature and chromaticity; on the other hand, higher temperatures will also accelerate Phosphor Aging

[0008] However, in the prior art, the excitation light emitted by the laser light source 45 usually converges on the fluorescent pink wheel 41 in the form of spot spots, which will form very strong light radiation on the color wheel area where the spot 43 is located, resulting in a higher temperature. , will reduce the luminous efficiency and conversion efficiency of the phosphor, and then reduce the output light efficiency of the projection light source 40, and the color temperature and chromaticity of the output light beam will change, resulting in poor image display effect of the projector.

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