DLP projector principle

Taking 1024 x 768 resolution as an example, there are a total of 1024 x 768 small mirrors on a DMD. Each mirror represents one pixel. Each of the small mirrors has the ability to switch light independently. The angle of light reflected by the small reflector is controlled by the video signal. The video signal is modulated by the digital light processor DLP, and the video signal is modulated into equal amplitude pulse width modulation signals. The pulse width is used to control the time for the small reflector to open and close the light path. , produces different brightness grayscale images on the screen. DMD projectors can be classified into single-chip, dual-chip and three-chip types according to the number of reflective lenses. Take monolithic as an example, DLP can produce color due to the color wheel placed on the path of the light source (composed of red, green, and blue groups). The light emitted by the light source passes through the condenser lens to the color filter to generate RGB three primary colors. A DMD chip containing tens of thousands of micromirrors projects the light from the light source through rapidly rotating red, green, and blue filters onto the surface of a microchip DMD micromirror array with 5000 mirrors per second. At the speed of rotation, the incident light is reflected and the image is projected through the lens via a plastic lens.