LCD projector type

The LCD projector has a liquid crystal panel projector and a liquid crystal light valve projector Two types of liquid crystal panel projectors: The liquid crystal has active liquid crystals and non-active liquid crystals. The active liquid crystal has translucency and is made into an LCD panel for use in a projector. TFT is an abbreviation of "thin-film transistor" and means "thin-film transistor." The TFT active matrix uses each individual transistor to control each pixel on the LCD panel. Because the TFT active matrix LC panel can produce faster response and contrast, it is the most widely used liquid crystal panel. Through the control system, the brightness, color, contrast, etc. of the light passing through the LCD can be controlled. The size of the LCD panel determines the size of the projector. The smaller the LCD, the smaller the projector's optical system can be and the smaller the projector is. To achieve high resolution on smaller LCDs and maintain high brightness, the harder the technical process is. The LCD panel projector is a passive projection method using an external light metal halide lamp or UHP lamp (cold light source).

Liquid crystal light valve projector: It adopts CRT tube and liquid crystal light valve as imaging device, which is a combination of CRT projector and liquid crystal and liquid crystal light valve. In order to solve the contradiction between image resolution and brightness, it uses an external light source, also called passive projection. The liquid crystal light valve is a kind of controllable switch and mainly consists of three parts: a photoelectric converter, a mirror, and an optical modulator. The optical signal output by the CRT is irradiated to the photoelectric converter, and the optical signal is converted into a continuously changing electrical signal; the external light source generates a beam of strong light, and is projected onto the light valve, reflected by the internal mirror, and can pass through the light modulator. The optical properties of the light valve are changed. The polarization filter of the light valve will filter light in other directions, and only allow the light in the direction of its optical slit to pass. This light is combined with the CRT signal and projected onto the screen. It is the projector with the highest brightness and resolution so far, with a brightness of 6000 ANSI lumens and a resolution of 2500×2000. It is suitable for situations where the ambient light is strong and where there are many audiences, such as large-scale command centers, conference centers, and large-scale Entertainment venues, but they are expensive, bulky, complex and difficult to maintain.