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On the basis of an 60 inch all solid laser television (TV) prototype, a chrominance signal conversion model from an original TV to a laser TV was established. By researching the characteristics of laser display, the conversion matrix between traditional phosphor TV color system and laser TV color system was derived by using a three color laser (red: 660 nm, green: 532 nm, blue: 457 nm) as primary-color. A gamut conversion circuit between the two color systems was given by utilizing a decode module, a Field Programming Gate Array (FPGA) controlling circuit and a coding module. The roles of these models and their working processing were analyzed, and the gamut conversion to the high-definition video signal was achieved. 11 feature colors displayed with the laser TV and the traditional phosphor TV respectively were measured and compared after conversion and the gamut conversion error is less than 9.8%. The experiment obtains an excellent result of gamut conversion and verifies the color-recurrent ability of high-definition laser TVs.

A LED collimator with double freeform surfaces was designed for uniform illumination in both near field and far field. The collimator includes refractive part and reflective part, and each part has double freeform surfaces. Based on Malus Law, the constant optical path length equations that realize the rays collimating were derived. Then associating with tangent-plane iterative method, the date both up freeform surface and down freeform surface simultaneously could be calculated. The simulations show that, 84.55% of the energy is collected in 2 for 1 mm1 mm size white LED after considering the Fresnel loss, reflective surfaces loss and material absorbing. The uniformity in near field is 94.59%, and the uniformity in far field is 89.01%. The uniformity in near field and the optical efficiency in 4 are above 90% and 83.5% respectively, while the LED chip sizes are under 2 mm2 mm. It is illustrated that the LED collimator can realize uniform illumination in both near field and far field with high light efficiency and the tolerance meet the requirements of alignment.

The Thirteenth East Asia-Pacific Conference on Structural Engineering and Construction (EASEC-13), September 11-13, 2013, Sapporo, Japan.