System for improving luminance of laser scanning projection image

Abstract

The invention provides a system for improving luminance of a laser scanning projection image. Compared with the prior art, the system has the obvious advantages as follows: the system is different from the power-increasing ways of the conventional polarization beam combination and wavelength beam combination; instead, the multiple laser beams of the same wavelength are subjected to special combination and arrangement by the system; as a result, the laser power is increased; and in addition, when the specially-arranged light spots are scanned by a galvanometer, high-luminance and relatively uniform lines can be obtained. The system has the advantages that the system is simple in structure, free of limitation from the power of a single light source, capable of lowering the cost, and the like; therefore, the image projected by laser lines can be higher in luminance and larger in size; and particularly, the outdoor application of transparent display is developed.

Description

technical field [0001] The invention belongs to the field of projection imaging, and in particular relates to a system for enhancing the brightness of laser scanning projection images. Background technique [0002] In the fully transparent laser projection display, the laser beam is required to have good collimation, and the imaging has a uniform spot or line at any position on the screen. The movement of the light spot is carried out according to a certain relationship. In addition, the light spot is required to have high brightness. , so as to form a high-brightness image, and the brightness of the image is directly related to the power of the laser. Using a higher-power laser can improve the brightness of the image, but for the ultraviolet laser diode used in transparent display, there is not only a single tube with higher power, but also A slight increase in power will result in a sharp increase in cost; another way is to use multiple low-power laser diodes to obtain hig...

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Problems solved by technology

[0002] In the fully transparent laser projection display, the laser beam is required to have good collimation, and the imaging has a uniform spot or line at any position on the screen. The movement of the light spot is carried out according to a certain relationship. In addition, the light spot is required to have high brightness. , so as to form a high-brightness image, and the brightness of the image is directly related to the power of the laser. Using a higher power laser can improve the brightness of the image, but for the ultraviolet laser diode used in transparent display, there is not only a single tube with higher power, but also A slight increase in power will result in a sharp increase in cost; another way is to use multiple low-power laser diodes to obtain high power through polarization combining, but polarization combining first requires that the two beams have different polarization characteristics, so it will cause light energy loss

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