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DLP Projection system: how does it work?

Last Updated: Jun 25, 2015 09:57PM CDT
We here at BenQ pride ourselves to use DLP projection technology. In fact, it is all over all of our marketing materials, but what does it really mean?

Well first, DLP stands for Digital Light Processing and is a projection system used in the projector world, along with 2LCD and LCoS systems. DLP was created by Texas Instruments and DLP chips are available from them currently. 
First, the DLP chip (sometimes called the DMD chip) is a processing chip that contains millions of very tiny mirrors inside a sealed enclosure that reflect light into the lens from the bulb. 

But how is that possible?

Well, these millions of micro mirrors actually move and are responsible for creating the image that you are seeing on the screen. they move only in 2 positions (you guessed it!): on and off, also known as 1 and 0. When one of the mirrors is on, it means that the light from the lamp is shining onto the surface of the DLP chip and whichever mirrors happen to be on, the light gets reflected into the lens, magnified through the lens and projected on the screen. if the mirrors are in the off position, then the light gets reflected onto a light absorber inside the unit. Since it is a processor above all else, it takes raw data of 0s and 1s that is supplied to it through the main board and tells the mirrors which way the should flip, either on for 1 and off for 0. Usually every mirror is responsible for every pixel in the given native resolution, therefore TI needs to make a variety of chips to suit different resolutions. This all is happening within a matter of microseconds, by the way.

DLP systems also use a color wheel to create color for the image, whereas 3LCD and LCoS do not use a color wheel.

I hope this helps a little bit in understanding how DLP systems work, and if you have any further questions, please give us a call or shoot us a public question.
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