Digital Micromirror Device (dmd Work Principle
Starting as the Deformable Mirror Device in 1977, the technology evolved to a bi-stable, or Digital Micromirror Device in 1987. Over the next decade the DMD technology was perfected, and with the necessary support electronics, was commercialized in the form of Digital Light ProcessingTM technology in the spring of 1996. As of October 2002, over. Oct 10, 2013 Video explaining DLP technology, including how a digital micromirror device (DMD) works, and its capability for the developer to create products for applications such as 3D measurement, machine.
DLP technology is based on an optical semiconductor, called a Digital Micromirror Device (DMD), which uses mirrors made of aluminum to reflect light to make the picture. The DMD is often referred to as the DLP chip. The chip can be held in the palm of your hand, yet it can contain more than 2 million mirrors each, measuring less than one-fifth the width of a human hair. The mirrors are laid out in a matrix, much like a photo mosaic, with each mirror representing one pixel.
When you look closely at a photo mosaic, each piece of it holds a tiny, square photograph. As you step away from the mosaic, the images blend together to create one large image. The same concept applies to DMDs. If you look closely at a DMD, you would see tiny square mirrors that reflect light, instead of the tiny photographs. From far away (or when the light is projected on the screen), you would see a picture.
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The number of mirrors corresponds to the resolution of the screen. DLP 1080p technology delivers more than 2 million pixels for true 1920x1080p resolution, the highest available.
In addition to the mirrors, the DMD unit includes:
- A CMOS DDR SRAM chip, which is a memory cell that will electrostatically cause the mirror to tilt to the on or off position, depending on its logic value (0 or 1)
- A heat sink
- An optical window, which allows light to pass through while protecting the mirrors from dust and debris
Micromirror devices are devices based on microscopically small mirrors. The mirrors are Microelectromechanical systems (MEMS), which means that their states are controlled by applying a voltage between the two electrodes around the mirror arrays. Digital micromirror devices are used in video projectors and optics and micromirror devices for light deflection and control.
Digital Micromirror Devices[edit]
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Digital Micromirror Devices (DMD) were invented by Texas Instruments in 1987 and are the core of the DLP technology used for video projection. The mirrors are arranged in a matrix and have two states, 'on' or 'off' (digital). In the on state, light from the projector bulb is reflected into the lens making the pixel appear bright on the screen. In the off state, the light is directed elsewhere (usually onto a heatsink), making the pixel appear dark. Colours could be produced by various technologies like different light sources or gratings.
Light Deflection and Control[edit]
The mirrors could not only be switched between two states, their rotation is in fact continuous. This could be used for controlling the intensity and direction of incident light. One future application is controlling the light in buildings, based on micromirrors between the two panes of Insulated glazing. The power and direction of the incident light is determined by the mirrors state, which itself is controlled electrostatically.[1]
MEMS Scanning Micromirror[edit]
A MEMS scanning micromirror consists of a silicon device with a millimeter-scale mirror at the center. The mirror is typically connected to flexures that allow it to oscillate on a single axis or biaxially, to project or capture light.[2]
References[edit]
- ^Viereck, V., Ackermann, J., Li, Q., Jakel, A., Schmid, J. and Hillmer, H., Sun glasses for buildings based on micro mirror arrays: Technology, control by networked sensors and scaling potential, Networked Sensing Systems, 2008. INSS 2008. 5th International Conference on, 2008, page 135-139
- ^http://nanophotonics.eecs.berkeley.edu/Publications/Conference/files/4481/Patterson%20et%20al.%20-%202004%20-%20Scanning%20micromirrors%20an%20overview.pdf