Liquid crystal polymer polarizing gratings have been widely studied in augmented reality optical waveguide displays due to their nearly 100% diffraction efficiency, large angular bandwidth, and wavelength bandwidth. The thickness of each area of the grating film layer prepared by the existing film production method (spin coating) is the same, which is unfavorable for uniform imaging of large-format liquid crystal polymer polarized grating optical waveguides. This paper proposes a method of etching and thinning the grating film layer to achieve specific efficiency modulation. The experimental values and simulated values are in good agreement, providing a reference for segmented control of the efficiency of large-format liquid crystal polymer polarization gratings.
Laser scanning head-up display has the characteristics of small size, high contrast, and no background halo. However, the power of direct modulation laser diode and the driving current of laser driver chip with high frequency about 100 MHz are limited, and the high brightness advantage of laser scanning display is still difficult to play, which also hinders the application and development of this technology. In this paper, a simple and effective light module is designed by using the shaping and coupling technology of multi laser diodes array. Two driving chips and six laser diodes are introduced, which is optimized the layout of laser diodes according to the characteristics of fast and slow axis. Finally, a single beam is projected to the mirror of MOEMS for laser scanning display by optical coupling fiber. The multi laser diodes array significantly reduces the laser coherence and suppresses the laser projection speckle effect. The experimental results show that the light module achieves more than 300 mW laser output power, promotes the brightness of the display, and is conducive to expanding the application of laser scanning display technology in the fields of projection, avionics and vehicle head-up display.
HUD can significantly improve driving experience and driving safety. At present, the field of view of vehicle head up display is generally small, and the information of display screen is limited. This paper presents the design of a larger field of view vehicle head up display optical system. Through the method of curve imaging surface, the display field of view is improved under the condition of keeping the system concise. At the same time, the imaging surface is projected by laser scanning display technology. The design principle is introduced and the simulation analysis of optical system is carried out. The results show that the horizontal display field of view of the system is about 15°, the pitch display field of view is about 8°, and there is no display distortion. The system can provide more display information without disturbing the driver's line of sight, and enhance the driving safety of high-speed driving.
HUD can significantly improve driving experience and driving safety. At present, the field of view of vehicle head up display is generally small, and the information of display screen is limited. This paper presents the design of a larger field of view vehicle head up display optical system. Through the method of curve imaging surface, the display field of view is improved under the condition of keeping the system concise. At the same time, the imaging surface is projected by laser scanning display technology. The design principle is introduced and the simulation analysis of optical system is carried out. The results show that the horizontal display field of view of the system is about 15°, the pitch display field of view is about 8°, and there is no display distortion. The system can provide more display information without disturbing the driver's line of sight, and enhance the driving safety of high-speed driving.
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