We have succeeded in designing a portable virtual display system based on a virtual projected optical design with
0.44"LCD panel. We have optimized the optical performance using a 2D optical multi zoom so that we should obtain a
comfortable eye motion box area. Furthermore, it is designed to mechanically adjust the system tilting angle in
considerations for different height of head positions. It is also able to display navigations maps and DMV in full color
using RGB 3in1 LED sources. We believe that this is developed as an alternative to conventional built-in type HUD
system targeting the high volume aftermarket at an affordable price.
This paper investigates the qualified method of the removal of hot spot speckle produced by a green laser with long coherence length for a projection display system. The application of a random phase plate using a binary computer generated hologram pattern is successfully applied to reduce the speckle contrast ratio to 2%; this is below the minimum level of 4% which can be recognized by the human eye.
The visualization of distortion was used for the distorted and undistorted interference fringe pattern by a Michelson interferometer. The half image of this symmetric interference fringe was automatically transformed to the continuous phase image by the automated carrier fringe analysis combined with FFT technique and the phase unwrapping method. Finally, the phase image of distortion was created by the calculated MATLAB programme.
In the correction of chromatic aberrations in the lens, the circular Fresnel zone plate is designed by the MATAB algorithm programme. The zone plate image with the high resolution of zone plate curvature surface is obtained by increasing the image pixel size (6000by 6000) and by the camera down system. The designed zone plate is fabricated by photography, and the surface of the fabricated zone plate is observed by WYKO interferometric microscope. Furthermore the chromatic aberration of lens combined with the fabricated zone plate is practically examined. This experiment obtained the reduced chromatic aberration.
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