DLP Guide, Meaning , Facts, Information and Description
- For political parties using this acronym, see Democratic Labour Party.
- For political parties using this acronym, see Democratic Labour Party.
DLP was developed by Texas Instruments, which is also currently the only producer and licenser of this technology, using their Digital Micromirror Device (DMD).
DLP is based on microscopically small mirrors laid out in a matrix on a semiconductor chip. Each mirror represents one pixel in the projected image. The number of mirrors varies: 800x600, 1024x768, and 1280x720 matrices are some common DMD sizes. These mirrors can be repositioned rapidly to reflect, or not reflect, light.
In a projector with a single DLP chip, colors are produced by routing the light from the lamp through the color wheel (which has the three primary colours: blue, red, and green) and then to the mirrors where it is reflected out through the optics. A 3-chip DLP projector uses a prism to split light from the lamp, and each primary colour of light is then routed to its own DLP chip, then recombined and routed out through the lens. Single-chip DLP systems are capable of displaying 16.7 million colours, whereas 3-chip DLP systems can display up to 35 trillion colours.
DLP is rapidly becoming a major player in the rear-projection TV market, having sold 2 million systems and achieved a 10% market share. Over 50 manufacturers will be offering models during the 2004 holidays, up from 18 the previous year. DLP chips currently constitute 5% of Texas Instrument's total sales. Small standalone projection units (also called front projectors) utilizing DLP technology have become very popular for office presentation and home theater duties.
- Pros: smooth, jitter-free images; good color depth and contrast; no burn-in; DLP RPTVs are smaller/thinner/lighter than CRT RPTVs.
- Cons: some people observe a "rainbow effect".
The DLP "Rainbow Effect"
This visual artifact is best described as brief flashes of perceived red/blue/green "shadows" observed most often when the projected content features bright/white objects on a mostly dark/black background (the scrolling end credits of many movies being a common example). Some people perceive these rainbow artifacts all of the time, while others say they only see them when they let their eyes pan across the image. Yet others do not notice the artifact at all. The effect is likely rooted in the concept of the flicker fusion threshold.From a technical standpoint, these rainbow shadows are a side-effect of the spinning color wheel used in single-chip DLP projection systems. As such, three-chip DLP systems do not exhibit the rainbow effect. Newer single-chip systems have endeavored to minimize the effect by increasing the speed of the color wheel and therefore, the rate at which colors are cycled.
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