A projector, also known as a projector, is a device that can project images or videos onto the screen. It can be connected to computers, VCDs, DVDs, BDs, game consoles, DVs, etc. through different interfaces to play corresponding video signals.
Laser projectors use laser beams to transmit images. The optical components of the laser projector are mainly composed of red, green and blue light valves, combined X prisms, projection lenses and driving light valves. There are red, green and blue lasers in the laser projector.
1. Light source
Laser TVs use solid-state lasers as the light source, while most traditional projectors use ultra-high pressure mercury lamps. The life span of the laser light source can reach more than 20,000 hours, and the life span is at least 8.5 years if calculated based on 8 hours per day.
Generally, the life of the ultra-high pressure mercury lamp for household projection is about 5000 hours. Calculated according to the use time of 8 hours a day, the life expectancy is about 2 years.
2. Projection technology
The mainstream projection technologies on the market are mainly divided into DLP projection and LCD projection. Most people do not understand these two types of projection technologies very well.
Ordinary projection uses the principle of LCD projection. It is to find a liquid crystal panel, the strong light passes through, and the lens hits the light on the screen, the image is still displayed on the liquid crystal panel, just like the ordinary liquid crystal display.
Laser projection adopts DLP projection. Its principle is to use many small mirrors. Each small mirror controls the angle of light to achieve different intensity control. The emitted light hits the screen through the lens to form a pattern.
3. Light resistance
Traditional projectors need a long installation distance, and good screens take into account the comfort of people’s viewing vision. Most of them adopt the principle of diffuse reflection to avoid direct reflection of strong projection light, so the light resistance performance is weak.
The laser TV adopts the principle of reflective short-focus projection, which shortens the projection distance and has strong anti-light performance. However, because most laser TVs use high-brightness laser light sources and ultra-short-focus projection distances, they will still be exposed to light to a certain extent. interference.