DLP, Digital Light Porsessor digital light processor. The application of reflective DMD device, DLP projectors have a reflective edge in contrast and uniformity are very good, high-definition images, screen uniformity, color, sharpness, and image noise disappear, the picture quality is stable, accurate reproduction of digital images can be continuously and timeless. DLP projectors can be divided into: MCU, two machines, three machines. DMD digital signal red, green, blue order of rotation, a small mirror to the pixel position and color of the number of open or closed, then DLP can be seen as only one light source and a projection lens optical system consisting of a simple lens to enlarge a DMD reflection images projected on the screen directly, so a lively, bright display shows the effect will be in front of us.
As the general DLP projector with a DMD chip, the most obvious advantage is small size, the projector can be made very compact. Now on the market of 1.5 kilograms of mini projectors are DLP-type, most LCD projectors confidential more than 2.5 kg. Another advantage of DLP projectors is the contrast between the large smooth image. These advantages make it a home theater video world, the preferred species. Higher contrast, and now, most of the DLP projector can achieve 600:1 contrast ratio to 800:1 between the low price is also up to 450:1. LCD projector only 400:1 contrast ratio near the low price of only 250:1. The impact of a strong visual sense of the screen, no pixel structure of feeling, the image of nature. Another advantage of DLP projectors is grainy weak. In SVGA (800 × 600) resolution on the format, DLP projector LCD pixel structure than weak, as long as the relative visual distance and screen size of the projected image was the right tone, have not see the pixel structure. Long life, quality and good stability: reflective DMD chip technology makes relatively little energy absorption, and because the use of semiconductor devices, high temperature performance, long-term use after the screen does not appear significant deterioration.
LCD (Liquid Crystal Display) LCD projector, the projector can be divided into liquid crystal panels and liquid crystal light valve projector, the former is the projector market, the main products. LCD is the range between liquid and solid substances, in itself does not shine, the nature of much affected by temperature, its operating temperature of -55 ℃ ~ +77 ℃. LCD projector using the photoelectric effect, that is, alignment of LC molecules under the electric field changes, affecting its LCD Danyuan the transmittance or reflectance, thereby affecting its optical properties, resulting in a different gray level and color images. As the LCD projector better color reproduction, resolution up to SXGA standard, small size, light weight, very easy to bring up is the projector on the market mainstream. The number of pieces in accordance with LCD panels, LCD projectors are divided into three machines and SCM.
LCD projector in a metal halogen light sources or UHP (cold light source), issued a bright white light, through the optical system of the spectroscope, the white light is decomposed into RGB (red, green, blue) color of the light of three elements, RGB color of the light of three elements in precise position through the LCD, this time the role of each liquid crystal light valve is similar to the control of liquid crystal in each of the passage of light through the light or not and how much. Three elements of color light on the way, through the projector lens accurately projected onto the screen, what point is the color of the light intensity of the number of all distributions are just good. Thus, the composition of the projection screen in line with the source image colorful image. LCD projectors have a common color is good, the price advantage and brightness uniformity and good many advantages.
LCD projector obvious disadvantage is the performance of bad black levels, contrast is not very high. LCD projector performance of black, gray look is always the shadow part becomes dark and without detail. This is not suitable for a class of video movies, for the words to the DLP projector is not a big difference. The second drawback is the LCD projector hit the screen visible pixel structure, the audience is like watching the scene through the window lattice. SVGA (800 × 600) format LCD projector of atom projector, no matter how the screen image size, pixel grid can be clearly seen, unless the use of higher resolution products.
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