Design Of The Linear Polarized Light Source Of High Energy Utilization Liquid Crystal Display Device

The LCD projector display system has a low energy utilization. The overall performance of this system was evaluated and simulated by the TracePro software. The factors that affect the energy efficiency of the whole system (includes lighting system, polarizing beam splitter and phase delay system) are analyzed.The basic lighting system design of the linear polarized light source includes LED light source choice, optimization design of the CPC collector, the beam converted to an aspect ratio of 4:3 rectangular beam by the double compound eye lens as well as the beam homogenization treatment. The energy utilization rate of exit beam from double compound eye lens was more than 90%. At the same time, the uniformity of exit beam was higher than before. Polarized beam splitter applied in optical projection system is analyzed, to design the polarized beam splitter film which have a large bandwidth and a large angle of incidence by using ZnS and MgF2. The effect of film layer, angle of incidence and wavelength of incidence light to extinction ratio of polarized beam splitting film is studied particularly. And it was found that in wavelength range of 420-680nm, spectral effects of film is ideal when angle of incidence is±2.5°and film layer is 21. Aiming to the defect of optical dispersion of phase retardation wave plate in conventional optical projection system, phase retardation system from S light to P light using prism of corner cube is designed. The optimal angle of incidence (-15°+15°) and polarization azimuth (-63°～-52°) when light incident to prism of corner cube is studied in order to polarization convert. The light energy of conversion efficiency from P light to S light was 75.33%.The other light energy was total reflected by the CPC collector to reuse. Experimental data is also analyzed using Stokes parameter method, the efficiency of 93.03%. The experiments verified the feasibility of the retroreflector as a phase retardation system.Finally, structure of projection display system was optimized, capacity usage ratio was calculated, errors were also analyzed. The results showed that optical efficiency and homogeneity of the system were improved completely.