History of DMD chip (DLP projector in the heart) after a close look at all understand

 As we all know, DMD is a Texas Instruments Digital Light Processing technology (DLP) as the core device. DMD concept first appeared in 1977, scientists from the Texas Instruments invented Larry J.Horn-beck. Interestingly, the original inventor of this technology is not to be used for the display device, but is prepared as a printing technology in the imager. Although it had been using the official name of DMD, but its English name and is not exactly the same. because when digital technology has not yet developed, the chip the micromirror or the use of simulation technology to drive, reflector is the use of a flexible material, so this technique was known as control technology, developed a new generation of DMD devices, and the name changed to , to 1992, Texas Instruments investors to set up digital imaging division, to explore the possibility of commercial application of DMD. Two years later, the first prototype to demonstrate the DLP projector was born in another two years in April 1996, the first commercial DLP projectors the official birth of .1997, Ti terminated in printing technology research and development, to research into digital imaging technology. Subsequently, DMD at an alarming pace in 2001, Ti 1996 announced No. 1,000,000 since the birth of DMD chip. DMDDMD under the electron microscope works must have our readers are familiar with, Figure 1 is a two DMD chip has been packaged, a small piece of a 848X600 resolution, large is 1280X1024 resolution. this looks like a piece of integrated circuit packaging substrate in the mirror kind of thing, in fact, is composed of a large number of micro-mirrors. Under a microscope, these tiny devices looks like this (Figure 2). Photos of the micromirror from the bottom of the micro-electronic mechanical device to drive, when the mirror reflecting the light to the lens, the pixel appears to be lit, if the mirror reflecting the light to the side of the screen display is a dark spot. Figure 3 we can see the lens after removing the exposed micro-electro-mechanical devices (MEMS). the secret of the color wheel DLP projector display colors in two ways, one is to use three DMD, each piece is responsible for a primary colors of the display, similar to the way as 3LCD. However, the cost of using three DMD is very high, so this program is only for the most high-end DLP projectors. Another is the so-called , circular color wheel is divided into R, G, B three transparent sections, white three-color filter through which to form a three-color light, and order has hit on the DMD. So, DLP projector color , is time-show, just because the color wheel turning very fast, based on persistence of vision mechanisms of the human eye, looking with all the colors are displayed. First generation of the color wheel speed is 120 rpm per second, so each color 60Hz monitor refresh rate is 2 times the standard, which is called two-speed color wheel color wheel. the same period, the projector's color wheel business, based on an increase in the tri-color with a white section, this can increase the brightness of the projector. But for home theater applications, high brightness but ineffective .2 Although the high-speed color wheel speed, but many people still feel that the color-sensitive than the same time show that this phenomenon is commonly known as has introduced RGBRGB section 6 color wheel, speed the same, but each color refresh rate up to 240Hz, so called 4-speed color wheel. If further speed up the speed, you can get 5-speed segment color wheel .6 The color wheel can also add a transparent section of a 7-segment color wheel, as can again increase the brightness. color wheel developed in the other direction, is to improve the performance of the color. Ti specially developed for the HD2 + chip, the DVE color wheel, that is, 6 nodes based on the color wheel to increase one or two dark green segments, used to reduce image noise, dark dark green. Recently, Ti and the RGB color wheel adds YCM three complementary color, a new 6-color color wheel, greatly expand the color gamut of DLP, known as the Computer Standards and 848x480 in 480p (16:9) video standards. This generation of DMD micromirror deflection angle of 1 (), contrast ratio ranging from 400:1 to 800:1, through appropriate optical design, the whole contrast ratio can improve to 1000:1. starting from the second generation of DMD, DLP regarded as the beginning of mass into the home theater projector market, this generation of DMD chip, called the HDl, not only the standard resolution to HDTV 1280X720, micromirror deflection angle is also increased to 12 degrees, so that light can be reflected to the more remote areas is absorbed, the impact of stray light is greatly reduced, so the black better performance, the contrast further. this generation of DLP's representative, has the famous Sharp IV-Z9000 and Marantz VPl2S1. After the HDl, Ti found that if the mirrors were all treated as the lower black metal, can greatly reduce the reflections from these metals out of the stray light, contrast consequent elevated to 2000:1, this technology is called as . This technology focuses on reducing the distance between the mirrors, reducing the possibility of stray light reflections, and more smooth surface mirrors to enhance reflectivity, so black and white two while improving the contrast once again increased. This is the generation of HD-class DMD HD2 +. DVE color wheel is introduced together with this generation of DMD. This generation of DLP projectors more representative, Sharp XV-Z12000, Marantz VPl2S3, Yamaha DPXll00, Optoma H77, evil is a lively, contrast, generally ranging from 3500:1 to 5500:1. HD2 + and later developed a smaller area of 0.65 inches DMD, improving the resolution to 1280x768, to further reduce costs, but still maintain the original level of performance. The famous Mitsubishi HC3000 and Optoma HD72 recent is the use of the chip. DC2 in the field of application of SD is 1024X576, and 800x480 resolution, two chips, corresponding to the W-PAL, and W-480p video. DC2 is a matter of course after the DC3, Based on the DC2, black more black, higher contrast ratio. DC3 chip direct result of one of the launch is the HD2 + chip prices, the Sharp XV-Z2000 and HD2 + BenQ PE7700 projector is a cheap representatives. DC3 chip and high-end representative of the projector, a Marantz VPl2S4, Yamaha DPXl200, Optoma H79, Infocus SP7210 and so on. this generation of projectors, with the optical system, and some manufacturers have been raised to a nominal contrast of 10000:1. DC3 after What is it? some people think is the HD3 and xHD3, but this is not more advanced than the next-generation technologies DC3, but two used in the back of the lower priced HD projector chip, the former is 720p resolution, which is 1080p resolution rate. true 1080p chip used in projection machines, is now imminent, pending issue.