Recently, in response to various limitations of the LCD technologies, high-brightness systems have been developed based on digital light processing (DLP) technology. A DLP projector includes a digital mirror device (DMD) that receives a demanded image to produce a video or still image that is projected onto a screen. The digital light processing projector generally eliminates the pixel mosaic problem of a liquid crystal display (LCD) projector and delivers a higher contrast ratio so as to enhance original color reproducibility, thereby enabling highly bright, clear, and large color images. The DLP projector, as compared to the liquid crystal type, has the advantage that the overall device can be small and simple because the optical system is simple and because it is not necessary to use as many as three liquid crystal cells. DLP projectors have a color wheel that rotates through the projected light beam. A lamp emits light that can be reflected through a converging lens to the color wheel, and the color wheel is rotated at an adjustable speed so that the light passing through it is filtered to alternately generate red, green and blue lights. A DLP light engine directs white light from a lamp onto a color wheel producing red, green, blue and white light. The color wheel is synchronized with a DLP processor chip that controls the components as appropriate to generate a color display. To turn a pixel on, the respective mirror reflects the light into the engine's optics. To turn a pixel off, the mirror reflects the light away from the optics. At the heart of a DLP projection display is provided a spatial light modulator (SLM) unit. A spatial light modulator unit comprises at least one spatial light modulator, which is a device that modulates incident light in a spatial pattern corresponding to an electrical or optical input.
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