Laser display technology is the next generation of display technology, with a wide range of color gamut, long life, environmental protection, energy saving, etc., which will lead to a revolutionary improvement in the overall performance of the display system. International multinational companies have recognized the "revolution in a display field." In the coming days, giants such as Sony, Mitsubishi Electric, Seiko Epson, South Korea’s Samsung, Texas Instruments, Osram, and Jena’s optics are stepping up research and development of the technology.
Laser display uses red, green, and blue (trichromatic) monochromatic lasers with higher power (watt levels) as the light source, mixed into full-color, and uses a variety of methods to achieve line and field scans when the scanning speed is higher than the imaged The critical flicker frequency can meet the human eye's "vision residue" requirement and can be clearly observed by the human eye. The critical flicker frequency should not be less than 50Hz. In the color gamut seen by the human eye, the liquid crystal can only reproduce 27%, the plasma is 32%, and the theoretical value of the laser exceeds 90%.
Laser display has two main directions for R&D. The first direction is to use the laser as a new type of light source for projection to the direction of the big screen. Generally, LCD, LCOS, or DMD chips are used as light modulators to perform projection display on the screen with the lens. The projection display has a larger volume and power consumption than a scanning type. Different projection distances require focus adjustment to be clearly imaged. However, the projection type laser has overcome the principle research stage and is currently developing a large-scale production process.
At present, Barco, Christie, Japan NEC (Japan Electric Co., Ltd.), Sony and China's Divide, Changhong, and Hisense focus on the development of projection technology. The projectors, engineering machines, and laser televisions that can be seen on the market are projection laser products.
Another research direction of laser display is direct imaging with high-speed scanning on a screen using a three-primary laser beam. Laser scanning has advantages over projection display in system volume and power consumption, and different projection distances can achieve clear display without focusing. Scanning display technology is then generally used to develop portable micro-displays. However, the development of laser scanning and display technology is relatively slow, and the products corresponding to technology research and scanning display still remain in the early stage of industrialization. MicroVision, Korea (Iljin), Symbol, Light Blue Optics (LBO) and other companies focus on this technology.
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