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Whether laser can replace LED is an inevitable trend, but there are still some problems to completely replace LED in the short term. Among them, the more tangled hot issues focus on color gamut and brightness.
Some people say that lasers can surpass lasers because of a wider color gamut. In fact, this view is not entirely true. Simply from the color gamut, the white LED is smaller than the standard color gamut range, and the three-color LED is only slightly larger than the standard range; and the color gamut range of the laser is significantly ahead, much larger than the standard color gamut. However, limited by technology, color gamut is only an ideal mathematical model, which is often or divorced from reality in reality. Because at this stage, humans can control the laser only a few bands, can not cover all, so its color gamut is not complete; the same reason, LED is also. Laser, in the color gamut is stronger than LED, only in theory, is our wishful thinking.
In terms of new light sources, (laser cross light source) the real advantage of laser over LED is brightness. At this stage, the LED projector can only reach 1000 lumens, and the brightness of the laser is almost unlimited, and it is the only light source that humans have the ability to create that can be close to the brightness of the sun. According to Wikipedia, on the surface of the earth, the brightness of the direct sunlight at noon is about 80000 to 150000 lumens; the laser created by human beings has such ability, which is undoubtedly the king of light sources.
From the actual performance of the models sold at this stage, pure LED projection still has certain advantages in terms of color gamut, but it is completely lost to laser projectors in terms of brightness. For the laser projector that was sold early in the world, the brightness of Mingji LW61ST can reach 2000 lumens, and there is still room for improvement. However, the projector that is bright at this stage is obtained by Bake's laser engineering projection, reaching 55000 lumens.
Safety Analysis of Laser Cross Light Source
Friends who have seen laser dance performance must be confused by the distinctive display effect of laser. However, in practical applications, the advantage of laser directionality is precisely the big obstacle for it to become a light source.
Laser is the only light source that can compete with the brightness of the sun at this stage, created by human beings. Laser engraving is divided into many grades, which can be understood as different energy and wavelength, and the corresponding colors are also very different.
Visible laser wavelength in 400nm to 700nm, with the increase of power, the visibility is stronger, but the damage to the human eye is also doubled; no matter what wavelength, color of the laser, the human eye has harm. Because of the wrong operation of the laser, temporary blindness, caused by serious flight accidents, leaving an indelible painful history.
Laser is the only light source technology with multiple strict restrictions. In the United States, lasers are regulated by the American National Standards Institute, the Food Administration, and the Drug Administration, among others. The visible laser pointer in the civil field is required to operate at a power of less than 1mW; the laser pointer for industrial use shall not be higher than 5mW.
In fact, the EU's standards are more stringent, the EU has not yet liberalized the production, higher brightness, non-military grade laser display equipment license, at this stage also clearly restrict the application of laser light sources above 5000 lumens in projection.
(Laser Cross Light Source) The Key Technology of Point to Surface Light Source
There are many technical difficulties in using a laser with strong directionality, that is, a laser with strong clustering, as a light source, among which the core key is diffusion technology. The method of overcoming laser bundling is very unique. Take Mingji LX60ST and LW61ST as examples, two diffusion lenses are built into the optical machine to convert point light sources into surface light sources.
The laser without diffusion will only appear in the form of point light source, not only can not become a surface light source, but also the spot after the dot matrix is still obvious, only simple laser dance performance can be carried out, and the damage of the laser in the cluster state to the human eye is immeasurable.
The characteristics of the cluster make the laser very stable, but it is a very unfavorable factor for the projection light source. Only after passing through the diffuser can it become a usable and divergent surface light source.
The laser beam is converted into a surface light source after passing through two diffusion plates in turn, which meets the use requirements of the projection light source.
In the disassembly process, the two diffusion lenses are hidden in the light path, which is not easy to detect, but its importance is self-evident. The laser has been diffused twice, but the energy of the laser is still stronger than that of ordinary light sources. In actual use, it is recommended that users do not look directly at the lens.