Almost all typical optical films are used in liquid crystal projection display systems. A typical LCD projection display optical system contains a light source (metal halide lamp or high pressure mercury lamp), an illumination optical system (including the light system and polarization conversion system), a color separation and color combination optical system, an LCD screen, and a projection optical system.
1, AR+HR
As the liquid crystal projection system for the high optical efficiency requirements, the use of high-efficiency reduction of reflective film and high reflective film, can make the system optical energy through each optical interface and in the refractive loss is minimized, and at the same time can maximize the limits of the suppression of stray light, eliminating the “ghost image” and improve clarity.
2. Infrared, ultraviolet cutoff filter
Liquid crystal projection system is often used to improve the brightness of the high-power light source, which emits a large number of ultraviolet and infrared light in the spectrum. The use of infrared, ultraviolet cut-off filters can remove the harmful ultraviolet light and infrared heat in the system, to prevent the liquid crystal aging, improve the service life of the system.
3, polarized light conversion film
Liquid crystals require the use of a polarized light source, which requires the conversion of light emitted from the light source into polarized light. Polarizing Beamsplitters (PBS) prepared using optical films can convert light into polarized light.
4. Color Separation and Color Combination Optical Films
In liquid crystal projection display systems, color separation and color synthesis are generally accomplished by optical films. In order to improve the quality of the system, the general requirements of the production of color separation film should not only have a high wavelength positioning accuracy and in order to ensure that the color of high quality, but also requires the spectral curve of the dichroic mirror in the separation wavelength has a high steepness characteristics, in the cut-off band has a deep cut-off, in the passband has a high transmittance, a small degree of ripple.
–This article is released by vacuum coating machine manufacturer Guangdong Zhenhua
Post time: Oct-11-2023