LED lighting color sequential LCoS pico projector design
|Keywords||Mini projector Non-imaging optics LED LCos Light bar and the relay lens group Corazon lighting front structure|
Projector performance in recent years has made great progress, you can better meet the needs of people on the show, more and more applications. Especially micro-projection technology began to market, widely used in personal consumption and business occasions, the market demand is very strong, the development of a bright future. In miniature projection systems, the optical engine is the main component of the system, which directly affects the final performance of the system, thus achieving the overall design of the optical light engine is the key to this system, projection display optical engine design includes the lighting system and the imaging lens two parts. Wherein the illumination system is very important. Because micro-display chips are 4:3 or 16:9 rectangle, so the illumination optical design of the projection display lighting, the most important thing is how to efficiently obtain a uniform rectangular beam. The main work includes: the current widespread use of micro-display chip comparison, using different micro-display chip optical micro-display projection technology structure and principle of the introduction; based on non-imaging optics, non-imaging optics introduction to the basic theory and a projection system of the illumination system the basic design theory; introduced light projection system, the illumination characteristics of the LED light source. This thesis uses the RGB color LED, green light alone way, red and blue way, two-way light passes through even after light illumination system together, measured using an integrating sphere R, G, B three-color LED respective color coordinates, by color Hybrid Theory calculated mixing ratio, adjust the LED driving time, to meet the requirements of synthetic white. And compares several lighting solutions, the use of light and light bar uniform transmission relay lens group zoom system, lighting design principles of the structure, through theoretical calculations, simulations to find the right combination of TracePro light bar dimensions and parameters of the relay lens group to achieve a ideal for energy efficiency and spatial uniformity; addition, this paper presents a first light source based on LCoS and LED lighting simple and compact way. Koehler illumination in principle, based on the Koehler illumination using a simplified front-end structure, with two simple LED light collecting lens, the aperture through reasonable set and optimize the LCoS display area on the chip to obtain uniform illumination, illumination uniformity very good, suitable for miniature projection light engine; requirements based on the overall optical system for imaging system design and simulation using TracePro overall optical system, and calculate the overall efficiency, while comparing the measured results and simulation to verify the accuracy of the design.