First of all, the biggest difference between the two is in the light source. The solid-state laser is used as the light source for laser projection, while the traditional projectors and most of them use ultra-high pressure mercury lamps. The two are also different in service life. The service life of laser light source can reach more than 20000 hours, and it can be used for 8.5 years if it is 8 hours a day. The general projector has a service life of 5000 hours and is generally used for about 2 years. This also leads to the high cost of the laser light source itself, the high one-time investment cost, but the subsequent replacement cost is small. The bulb is just the opposite.
Ordinary projection adopts the principle of LCD projection. The image is still displayed on the panel, but the picture is projected onto the screen through a stronger light source and lens. The laser projection adopts DLP projection. Its principle is to use many small mirrors. Each small mirror controls the light angle to achieve different strength control. The emitted light hits the curtain through the lens to form an image.
They have different throw distances. Due to the limitation of the principle, the general projector has high requirements for space, and needs a large indoor environment and throw distance. On the contrary, the laser adopts reflective short focus projection. Therefore, a large picture of more than 100 inches can be projected at a distance of half a meter.
The traditional projector has a long projection distance and needs to be matched with a good screen. Most of them adopt the principle of diffuse reflection, which can avoid the direct reflection of projection strong light, so it has weak anti light performance. The laser projection, based on the principle of reflective disconnected projection, can shorten the projection distance, have higher brightness and stronger anti light performance.
Laser projection works differently from ordinary projection. A laser projector uses a laser beam to transmit a picture. The optical components of laser projector are mainly composed of red, green and blue light valve, beam combining X-prism, projection lens and driving light valve. In the normal projection mode, the light is mixed after rotating at high speed through the color wheel, and finally transmitted through the prism.