LCD liquid crystal

LCD projection technology since the 1990s , led by the Japanese projection technology, its development works like slide projector, high brightness halogen bulbs by the Department , the irradiation LCD panel , and then the image through the panel , after the projection lens and the focus group enlarge image, display the image projected on the screen , the projector has three LCD panels inside each piece are responsible for RGB three -color imaging, this three primary colors overlap images and projected through a color image. LCD projection technology projection process is mainly the light bulb through the filters, beam splitter , and then refracting lens at the image projected onto the screen. LCD projectors projector market is currently the main product. LCD is between liquid and solid material between itself does not light , nature of work greatly affected by temperature , the operating temperature of -55 degrees to +77 degrees . The liquid crystal projector of the photoelectric effect , the liquid crystal molecules changes in the electric field , the liquid crystal cell affect transmittance or reflectance , thus affecting its optical properties , generating a different gradation and color images. LCD projectors better color reproduction , resolution up to SXGA standard , small size , light weight, operation is extremely easy to carry , and relatively inexpensive . Character LCD Module technology currently focused on the core technology and SONY EPSON two .
LCD projection for the current relatively mature technology, but due to the performance of the product characteristics , in the face of DLP, LCOS competition, have the following major technical problems to be overcome :
" Lack of brightness : Due to limited aperture ratio , the light utilization is low, in addition monolithic coupled with color filters absorb light source , the light utilization below 10% , so the brightness is still much room for improvement , the current vendor to increase the chip size to overcome .
" Black and white contrast : LCD liquid crystal because of its development have leaked and, therefore, can not make a true black , black and white contrast is poor will affect the quality of three-dimensional, which must be arranged by the LCD to improve the shading effect , this is the family video application is very important.
" Heat problem : Due to the high intensity halogen bulb temperature is high , the heat lamp life problems of a big influence .
"LCD itself, the physical characteristics of the decision of its slow response , over time , performance declined in 1995 by Japanese companies led by LCD manufacturers developed a polysilicon (Poly-silicon) technology , making the projection display systems have more choices . polysilicon (Poly-silicon) technology uses cylindrical lattice , and the TFT LCD Displays on the front plus a set of micro- convex lens , the light is converted into the mirror parallel to the cross of light , this would resolve the crystal silicon optical transmittance of LCD technology problem of low efficiency , the light transmittance rate of 95% , so the same light conditions , improved brightness.