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Laser display can truly reproduce the rich and gorgeous colors of the objective world, its color gamut coverage reaches 90%, color saturation is more than 100 times that of traditional display equipment. In addition, laser display can realize double high definition and true 3D display of image geometry and color, which is the best way to realize high fidelity image. Therefore, laser display has been called "a revolution in the history of human vision".The emergence of laser display technology provides a new opportunity for the development of China's display field. In the 1980s, the national 863 Program established an industrial alliance around laser display technology. After the 21st century, the technology of semiconductor laser develops comprehensively, and it is more competitive as the light source of laser display. Semiconductor lasers can be directly excited by current, which is more efficient than solid-state lasers. The working material attenuates slowly and has a longer service life; The light source system is smaller and suitable for high integration; Mass production with a semiconductor process can make the device cost lower.
In laser display systems, the wavelength selection of red light source is mainly considered in two aspects: first, the sensitive wavelength of human eyes is selected according to the responsiveness of human eyes to the wavelength, to obtain higher optical efficiency; Second, the selected wavelength can expand the coverage of the gamut, to obtain a better color experience. For a red laser larger than 600nm, the shorter the wavelength, the higher the optical efficiency; The longer the wavelength, the larger the gamut coverage. Therefore, in practical application, it is necessary to consider the application scene of laser display and the performance of the light source system comprehensively and select the appropriate laser wavelength. At present, the wavelength of red light used in laser display is usually concentrated at 630 ~ 650nm.
With the development of red-light semiconductor laser, the output power of the device has been greatly improved, the power level of the current commercial 635nm red-light semiconductor laser has reached the watt level, through the photosynthetic beam processing, the power level can meet most of the application requirements of laser display. The requirements of laser display for the quality of light source mainly depend on the laser display technology used. At present, the mainstream laser.
