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DLP® Using Digital Micromirror Devices: A Primer
Digital Light Processing (DLP®) is known as a multipurpose, robust, modern, and easily accessible optical technology that uses digital micromirror devices (DMDs), which reflect light pixelwise from a light source to a target. DLP® was invented by Texas Instruments and is commonly used in projectors, as shown in Fig. 1, but is also used in other fields. The internal structure of a DMD is visible in Fig. 2. Many reflective micromirrors are placed in an array. Each micromirror represents an optical pixel (Fig. 3). Depending on the format (there are different formats available) of the DMD, the array has a number of micrometers placed on it, e.g., 768 × 1024 (XGA) or 1920 × 1080 (FullHD 1080p). To protect the micromirrors from external influences, a cover glass is installed on the aperture. The DMD is, in most cases, deliverable as a UV-, VIS-, or IR-optimized version, depending on the field of application.
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