Investigation On Optical Engine Of Projection Display System Based On LED

Projection display technology projects the image information on the micro-display onto the screen with optical systems to form magnified images .The advantages of projection display are large screen ,high brightness , high contrast and high resolution , which makes application of Projection display cover form the high-end military command ,large conference to business, education ,scientific research ,entertainment and other areas.The optical engine of projection display system main part of the whole system will have heavy effects on final performances .So it is the key to design the optical engine. The optical engine design includes lighting systems and imaging projection lensProjector lighting systems has been plagued by the problem of light in their development. Compared to the traditional sources, the LED has the irreplaceable advantages of high efficiency, no infrared irradiation, small size, low power consumption and long lifetime, which meet the projector light on the requirements of high-flux output.First of all , the background of the projection display , its category and enormous market potential are introduced, there are three typical kind of the projection system .those are CRT,TFT-LCD,LCOS,DLP Projection display ;then the paper introduced the principle of the non-image theory , the etendue principle , the principle of the energy efficiency of the illumination system. Introduced the high luminance LED development, the property of structure, and unified Luminus the production high luminance LED to carry on the performance test.Next in view of optics engine's characteristic, the non-image formation optics theory method is utilized. etendue value was used to illustrate luminous flux and optical efficiency. Relation between optical efficiency and etendue value is analyzed. On the base of principle of the non-image theory, etendue, the characteristic of LED and two section of DMD of different projected display chip parameter:HD2 and XHD5,ZEMAX and Tracepro are used in the design of DLP lumination system. improvements on whole system were made by computer emulation and optimized design . It has satisfied the projected display market commercial request.