High-performance photopolymers are the key to promote the development of holographic optical waveguides in the field of AR. In this study, through introducing high refractive index monomers and low refractive index fluoroelastomers into the formulation of a photopolymer, both transmission and reflection volume holographic gratings (VHGs) with high Δn can be recorded. In addition, the transmittance of the VHGs within 400~800 nm can reach 96% after photobleaching. The results indicate the photopolymer has great application potential to prepare VHGs for AR.
This article studies two main ways of gamut expansion: improving the color purity of the primary color and increasing the number of primary colors. A program for the gamut coverage of the multi- primary color display system is written. The color coordinates of the laser TV developed by ourselves are measured and the actual value of color gamut is calculated. The test data verifies the simulation result.
Self-developed three- primary color laser projection TV based on RGB (RED, GREEN, BLUE) laser diode is given by this paper. Laser diode has very narrow line-width, high color purity and saturation, and displays more colorful and gorgeous image. In this work, the Helmholtz-Kohlrausch effect is applied for studying the enhanced perceived brightness of the RGB laser projection television. The experiments are designed for the difference perceived brightness between the RGB laser projector TV and the Blue laser- excited phosphor laser projection TV. The ratio of the enhanced perceived brightness of RGB laser projector TV is evaluated.
In this paper, we design a setting that could constantly monitor the screen vibration frequency and a speckle measurement system that simulates characteristics of human eye to record speckle images. Three vibrating methods, including acoustic wave vibration, frame vibration and chip motor vibration, are adopted to eliminate speckle. Speckle contrast, power consumption and noise are measured, separately. On our experimental platform, when the speckle contrast is less than 5%, the human eyes perceive free of speckle. By comparison, the chip motor vibration has optimal performance that the speckle contrast is 4.97%, power consumption is 1.51 W, and noise is 43.1 dBA. Therefore, the chip motor vibration method is the most suitable method for improving image quality in laser display.
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