Liquid Crystal Light Valve Projector

The use of CRT tubes and liquid crystal light valves as imaging devices is a combination of CRT projectors and liquid crystal and light valves. In order to solve the contradiction between image resolution and brightness, it uses an external light source, also called passive projection. The general light valve is mainly composed of three parts: a photoelectric converter, a mirror, and an optical modulator, which is a kind of controllable switch. 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 their high prices, large size, light valve is not easy to maintain. For users who are looking for high resolution, high brightness, and large screens, liquid crystal light valve projectors are their first choice.