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LASER light source is an electric light source that uses excited particles to emit light under the action of stimulated radiation, and is a coherent light source. The concept of laser display appeared in the 1960 s, and scientists around the world tried to apply laser technology to the study of display light sources. However, limited by the level of laser development at that time, the research project progressed slowly. In the 1990 s, with the successful development of key materials for all-solid-state lasers, the research of laser display technology was greatly promoted. In 2003, a historic breakthrough was made in the research of display technology. The white light was successfully mixed into white light by RGB three primary color visible light laser, and a series of engineering prototypes were developed. 2005-2010 is the initial stage of laser display industrialization. At this time, China and the world's leading enterprises have launched a laser projection, television and other principle prototype. It has entered the early stage of industrialization. At this stage, all countries are stepping up their efforts. Build a complete science and technology industry chain, accelerate the development of industrial demonstration, patents and technical standards. Around 2010, the laser display industry will enter a period of rapid growth, and the market will reach an annual industrial scale of US $57 billion.

Before being applied to DLP, the products have been widely used in various electronic products. Such as printers, various precision measuring instruments, medical equipment, weapons, etc., the performance is very stable.

Compared with other light source projection units, the laser light source projection unit has the following advantages:

1. High brightness: The brightness of the laser light source projection unit is 1700ANSI --- 10000ANSI can be customized, which is much higher than UHP bulbs and LED light source products.

Luminous efficiency: The luminous efficiency of the laser light source is 12Lm/w, which is higher than the 5Lm/w of the UHP light source and the 3.5Lm/w of the LED light source.

3. Life of light source: The life of UHP light source is still struggling to improve (up to 20000 hours in the future), the stability of LED light-emitting diodes is recognized, and the life is about 60000-80000 hours. The brightness life of the LASER light source depends on the life of the phosphor wheel, which is about 40000-60000 hours, while the life of the laser is up to 100000 hours.

4. Maintenance cycle: Their attenuation and color coordinate changes depend on individual parts. Due to the long life, the maintenance cycle is relatively long. The LED consists of three groups of lights of different colors, each group has six lights. The attenuation degree of different color light can not be consistent, resulting in color drift too large, must be adjusted after a certain period of time.

Color gamut: The color of the laser light source is close to the international TV standard RC709. It has high brightness and true color. It is a display technology with the best reproduction effect in the display field.

Energy saving and environmental protection: UHP is a high-pressure mercury lamp, which contains highly toxic substances, while LED and laser light sources are green products. The power of the laser light source projection unit is only 130-160W, which is much lower than the 320-450W of the LED light source and the 200W-320W of the UHP light source.

From the above comparison, it can be seen that the light source of the projection unit has been gradually developed from UHP to LED and laser light sources. At present, optical products have been widely used in front projection projectors and large cinema projection equipment, and gradually entered the rear projection TV wall market this year. Laser light source products are the future development trend.