The white light generated by the lamp in a DLP projection system passes through a colour wheel as it travels to the surface of the DLP chip. The colour wheel filters the light into red, green, and blue from which a single-chip DLP projection system can create at least 16.7 million colours. And the three-chip system found in DLP
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FIGURE 4.29 DLP optical semiconductor chip. (Copyright© Texas Instruments.) (See colour insert.) |
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FIGURE 4.30 DLP optical semiconductor chip showing micromirrors. (Copyright © Texas Instruments.) |
Cinema® projection systems is capable of producing no fewer than 35 trillion colours. The ‘on’ and ‘off’ states of each micromirror are coordinated with these three basic building blocks of colour. For example, a mirror responsible for projecting a purple pixel will only reflect red and blue light to the projection surface; our eyes then blend these rapidly alternating flashes to see the intended hue in a projected image.
