Compared with traditional projectors, laser projectors have a longer lifespan of up to 20,000 hours, which is four times the average life cycle of traditional projectors, and can help users save a large amount of funds that would otherwise be spent on consumables. Why is the laser projector's long service life? This is about how it works.
Laser Projector Working Principle
There are two kinds of laser projection technology, one is monochromatic light and the other is colored light. Monochromatic light projection technology is already very common. For the simplest example, the daily use of a laser pointer is a monochromatic light projection technique. And sometimes we can add various grids in front of the monochromatic laser light so that we can project the simplest laser image.
Some modern laser projectors are based on a laser source, such as the DLP mode introduced by BenQ. The blue laser is used as the main light source. The light emitted by the blue laser is separated into red, green and blue by the color wheel, and then three. The color is projected on the DMD chip from the image formed by the human eye. Of course, since the laser is a point light source, the system also has a configuration of a diffusion sheet, a light tube, and the like, so that the laser can be used for beam expansion.
Principle of laser television
The principle of another color laser is not complicated. By controlling the three-color laser, the entire color system is constructed. This is the same as the principle of the CRT. The difference is that the CRT realizes different color performances by controlling different electron guns, and the laser projection The machine directly controls the light, and the efficiency and effect are greatly enhanced.
For example, the use of the early laser light is the LCD mode.
It uses red, green and blue three-color lasers, ie, three-color lasers of red, green and blue. The lasers are then integrated into the X-prism through the corresponding optical components and the processing chip to expand the laser beam. Then the three lasers are integrated. The projection lens then transmits the integrated laser light to the projection screen to complete the entire laser projector display process.
The advantages and disadvantages of laser projectors
advantage:
1, the image should not be blurred
Ordinary projectors are required to be placed as far as possible on the screen, and laser projectors do not have this problem. Even if the "projector head" is placed in the corner, the projected image will not have any distortion. Laser projection does not produce any ambiguity anywhere.
2, high color
In the display effect, since the laser projector simulates the natural color, the color and the gradation are also more abundant. The wavelength of the light is fixed, so it looks very comfortable and there is no unpleasant feeling that the light bulb is dazzling. More importantly, there is no ultraviolet light of traditional light sources, making the eyes relaxed when they look at the picture. This point, whether it is a projection device or an active light-emitting device, is unmatched.
3, long service life
This point has already been explained in the working principle of the above laser projector and will not be repeated.
Disadvantages:
1, the effect is less than professional LED projection
At present, more is just for home audio and video enthusiasts, although it can also be applied in some areas such as presentations, education, etc., but the actual experience is not as professional projection products.
2, less classification
Laser projectors have a short time to market and lack the ability to adapt to the market. Currently, they can only meet the needs of some users.
3, lack of flexibility
Compared with LED projectors, laser projectors lack the necessary flexibility. The former can be lifted and placed on shelves, and can be moved from the living room to the study room and bedroom.
4, the price is relatively expensive
The unit price of the laser projector is higher than that of the LED projector. Although the laser projector has a long service life, once the light source, the cost is much higher than that of the conventional projector.
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