1. There are three LCD panels in the projector, in which the liquid crystals are distributed. Liquid crystal is a substance between liquid and solid, and it does not emit light by itself. They are arranged neatly like pixels on a fluorescent screen. The projector uses the photoelectric effect of liquid crystal, that is, the arrangement of liquid crystal molecules and the state of liquid crystal molecules themselves change under the action of electric field, thus affecting the transmittance or reflectivity of its liquid crystal box.
2. Using this principle, the projector can accurately control the light passing through the liquid crystal cell by using electrical signals. The light source in the LCD projector is metal halogen lamp or UHP (cold light source), which emits bright white light and is decomposed into RGB (red, green and blue) light through the beam splitter in the light path system.
3. The light of three colors of 3.RGB elements passes through the liquid crystal at precise positions. At this time, each liquid crystal is like a light valve, which controls whether and how much light in each liquid crystal passes. In this way, the light of three element colors is accurately projected onto the screen through the lens of the projector.
Extended data:
1, CRT three-gun projector can decompose the input signal source into three CRT screens: R (red), G (green) and B (blue). The phosphor is amplified and converged by the luminous system under high voltage, and a color image is displayed on the big screen.
2. LCD projectors can be divided into LCD flat panel projectors and LCD light valve projectors. The former is the main product in the projector market. Liquid crystal is a substance between liquid and solid, which does not emit light and its working characteristics are greatly affected by temperature. Its working temperature is -55℃ ~+77℃.
3. The red, green and blue of 3.DMD digital signal rotate in turn, and the small mirror is turned on or off according to the position and color of pixels. At this time, DLP can be regarded as a simple optical system, which consists of only one light source and a group of projection lenses.
References:
Baidu encyclopedia-projector