| With the development of TV technology, large screen, thin, high resolution and image quality good will become mainstream. projection television,particularly LCOS projection television will be one of the future direction of development. Projection TV light engine is one of the core components. As imaging devices, within a short distance required to achieve a large magnification without distortion, and good clear picture quality.This article first introduces the LCOS chip LCOS technology and technical characteristics, then for the application of plastic aspheric introduces plastic aspheric design features and design principles; and a brief description of the optical design principles and aberration theory of knowledge, which includes the distal Some optical characteristics of the final analysis of the design requirements are to design the various parameters of the projection lens, combined with previous designs of projection lens, designed to meet the requirements of the projection lens and make a tolerance analysis. Requirements of large screen projection lens demand excellent image quality, especially color and distortion. The size of a single pixel LCOS 8.1um, the color difference by analyzing the projection lens is less than half of the pixels that 4um, distortion less than 0.5%. Optimization process with the glass material by optimizing the function and color settings to control the size.The final optimized design a turning angle of 90 degrees, F number of 2.3, the focal length is 9.4mm, less than 1 degree telemetric, lateral color is less than half a pixel 4um, distortion less than 0.3%, projection size is 65 inches, total length to meet the requirements of the LCOS projection lens, the system uses a plastic non-spherical, glass materials are used in glass materials commonly used in China. LCOS projection lens group conducted after the tolerance analysis, gets the business process performance in line with the tolerance for mass production data, with satisfactory results. |
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