The full name of DLP is digital light processing, which was developed by Texas Instruments 1 1 years ago. Because of its working principle and characteristics, this technology has high reliability. The DMD chip of DLP projection system is an extremely precise semiconductor optical switching element, which consists of a large number of display micromirrors, each of which is fixed by a micro hinge. By tilting the display micromirror back and forth, bright or dark projection pixels can be realized. The color of DLP projection system is realized by the high-speed rotating color wheel. The light generated by the light source of the projection system can be filtered into three colors: red, blue and green after passing through the color wheel, and the gray images of the three colors are displayed at high speed in turn, and the superposition of the three gray images is completed by the human eyes, thus producing color images.
Working principle of single DLP projector
DMD chip, the core component of DLP projection system, has the characteristics of heat resistance, moisture resistance and vibration resistance, and compared with other projection technologies, DMD chip will not cause aging phenomena such as discoloration of projected images due to long-term use. Therefore, the highly reliable DLP projection system is very suitable for the commercial big screen market. Since the birth of DLP technology, the large-screen display system based on this technology has also captured the city and occupied most of the market quickly in some fields.
Although DLP has sharp data display and light volume, it does not have the degradation phenomenon and screen window (grid) effect like LCD. But the disadvantage of DLP projector is also obvious-the color is hard to hurt. Single DLP uses a color wheel to display colors, so the nature of the color wheel often determines the number and fineness of colors. In addition, each color is not displayed synchronously, so there will be some color fracture phenomenon (commonly known as rainbow effect), which is also the biggest defect of monocular DLP projector.
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DLP Projector Picture Digital Light Processing Projector is a projection technology that Texas Instruments uses digital micromirror device DMD chip as imaging device to project images by adjusting reflected light. It is very different from LCD projector, and its imaging is realized by thousands of tiny lenses reflecting light. The core technology of DLP chip has been controlled by Texas Instruments. DLP technology seems to be catching up with Intel Inside, because it requires all projector products using DLP technology to be marked with DLP logo. Whether it will achieve the same achievements as Intel in the PC field or not, at least it shows its determination to lead the underlying technology of projectors. DLP manufacturers are mainly European and American manufacturers, such as ASK, Hewlett-Packard and vivitek.
DLP projectors are divided into: single DMD machine (mainly used for portable projection products), two DMD machines (used for large-scale splicing display walls) and three DMD machines (used for ultra-high brightness projectors).
Principle of DLP projector: Take the resolution of 1024×768 as an example, there are 1024×768 small mirrors on a DMD, each mirror represents a pixel, and each small mirror has the ability to control light independently. The angle of the light reflected by the small mirror is controlled by the video signal, which is modulated by the digital light processor DLP, and the video signal is modulated into a pulse width modulation signal with equal amplitude, and the opening and closing time of the light path of the small mirror is controlled by the pulse width, so that gray images with different brightness are generated on the screen. DMD projectors can be divided into single-chip, double-chip and three-chip according to the number of reflective lenses. Taking a single chip as an example, DLP can produce colors because the color wheel (composed of three groups of red, green and blue) placed in the light path of the light source generates three primary colors of RGB through the light emitted by the light source through the condenser lens to the color filter. A DMD chip containing thousands of micromirrors projects light from a light source onto the surface of a microchip DMD embedded with an array of micromirrors through fast-rotating red, green and blue filters. These micromirrors rotate at a speed of 5000 times per second and reflect incident light.