The basic structure of all projectors is nothing more than these parts.
For the purchase, the important thing is to choose the light source and the image display chip.
As for what is 3LCD, what is DLP, and what is LCOS, it is just the structural differences brought about by the different components, but it can't escape the above parts, and listen to me slowly.
The basic structure of all projectors can be summarized into the following key parts.
When choosing to buy, focus on two elements: the light source and the image display chip.
There are three main types of light sources:
Ultra-high-pressure mercury lamps, which are commonly used as light sources for conventional projectors.
LED, with the popularity of smart projectors, high-power LED lights have become a common choice.
Lasers, depending on the color, can be divided into monochromatic lasers, bichromatic lasers, and trichromatic lasers.
The image display chip is another important component of the projector, and there are three common technologies: DLP, LCD and LCOS.
DLP (Digital Light Processing) projector use.
DMD (Digital Micromirror Device) is an image display chip that consists of millions to tens of millions of tiny aluminum mirrors.
These mirrors are micromechanically controlled by the angle of reflection to achieve the brightness and darkness of the pixels, and the grayscale changes are generated by PWM modulation.
The image display chip of an LCD (Liquid Crystal Display) projector is a lens containing a liquid crystal. The light transmission or non-light transmission of the liquid crystal is controlled by the circuit, so as to change the brightness and darkness of the pixels.
The light first becomes polarized light through the polarizer 1, and then the liquid crystal layer changes the polarization direction of the light with the voltage, and finally decides how much light can pass through the polarizer 2 to achieve the effect of modulating brightness.
LCOS (Liquid Crystal on Silicon) is actually an aluminum reflective layer added to the basis of LCD, so that the display chip changes from light transmission to reflection.
Its working principle is still to control the reflection or non-reflection of the display chip through the circuit, thus changing the brightness and darkness of the pixels.