In recent years, laser display technology has become the new favorite of projection companies and home appliance companies, including Hisense, Divi Video, Barco, Christie, NEC, Sony, LG, Changhong, Nuts, Guangfeng Optoelectronics, Simeile, Konka, etc. Leaders in the large-screen display industry have also established their presence in this field, and have continuously made breakthroughs, and the laser pointer display technology has also made considerable progress.
Laser display technology is the fourth generation of display technology after black and white display, color display, and digital display. Among the many continuously developing display technologies, laser display technology represents the future development trend and mainstream direction of display technology, and is the focus of future competition in the display field. On the basis of inheriting all the advantages of digital display technology, laser display technology uses red, green and blue lasers as the display light source, achieving a major breakthrough in chromaticity and solving the long-standing large color gamut color reproduction in the field of display technology. Therefore, it can reproduce natural colors perfectly.
The color reproduction capabilities of the display devices currently on the market (such as: CRT, LCD, PDP, DLP projector and movie projector, etc.) have not broken through the color space of the NTSC standard, and their color gamut space can only cover what the human eye can recognize With 33% of the color space, it is difficult to truly restore natural colors. This deficiency has become an important obstacle to further improving display quality. After the digital display technology has achieved the high definition of the display system, the laser display technology will realize the image reproduction with a larger color gamut. The laser display system is an inevitable product of the development of display devices to higher performance.
The laser full-color display technology uses red, green, and blue lasers as light sources. Its working principle is shown in Figure 2. The red, green, and blue lasers are respectively incident on the corresponding light after beam expansion, shimming, and decoherence. On the valve, an image modulation signal is added to the light valve, and the modulated three-color laser is combined by the X prism and incident on the projection objective lens, and finally projected onto the screen by the projection objective lens to obtain the laser display image.
The “highest state” laser display in the display world is a display technology that uses red, green, and blue (RGB) lasers as the light source, which fully embodies the three characteristics of high-fidelity images-ultra-high-definition, full-color and true three-dimensional. In the opinion of Academician Xu Zuyan of the Chinese Academy of Engineering, green laser pointer display is the “highest state” in the display field. The laser can realize a large-screen display with the geometric resolution limit of the human eye. It is difficult for the naked eye to distinguish different skin colors with slight differences on an ordinary display, but it can be clearly distinguished on a laser display. “Xu Zuyan, an academician of the Chinese Academy of Engineering, once said.
The advantages of laser display technology are first reflected in high image quality and large field of view, that is, the most vivid colors, the richest colors, the clearest images, and the color temperature can be adjusted, which can seamlessly splice large screens. In addition, laser can achieve true three-dimensionality through holographic technology, which is also the best way to achieve full-color display among many display technologies. In the future, the geometric resolution of the laser display will be increased to 12-21 times that of the current HDTV, the number of colors will be increased to 500 times that of the current HDTV, the color gamut coverage will be increased by 3 times, and the three-dimensional display will be able to achieve true three-dimensional display. .