Digital Micromirror
Digital Micromirror Device (
Chunhai Ji
Introduction
The applications of large screen, high brightness electronic projection displays include (1) electronic presentations, (2) entertainment, (3) status and information and (4) simulation (e.g., training, and games). So far the electronic presentation market is being driven by the pervasiveness of software that has put sophisticated presentation techniques into the hands of the average PC user. Normally three of projection display techniques are used widely, i.e. oil film, CRT-LCD, and AM-LCD. Oil film projectors is developed in early 1940s and have been the workhorse for applications that require projection displays of the highest brightness. But the oil film projector has a number of limitations including size, weight, power, setup time, stability, and maintenance. In response to these limitations, LCD-based technologies have challenged the oil film projector. These LCD-based projectors are of two general types: (1) CRT-addressed LCD light valves and (2) active-matrix (AM) LCD panels. LCD-based projectors have not provided the perfect solution for the entire range of high-brightness applications. CRT-addressed LCD light valves have setup time and stability limitations. Most active-matrix LCDs used for high-brightness applications are transmissive and, because of this, heat generated by light absorption cannot be dissipated with a heatsink attached to the substrate. This limitation is mitigated by the use of large-area LCD panels with forced-air cooling. However, it may still be difficult to implement effective cooling at the highest brightness levels. In response to these and other limitations, as well as to provide superior image quality under the most demanding environmental conditions, high brightness projection display systems have been developed based on Digital Light Processing (DLP) technology. DLP is based on a microelectromechanical system (MEMS) device known as the Digital Micromirror Device.
Chunhai Ji
Introduction
The applications of large screen, high brightness electronic projection displays include (1) electronic presentations, (2) entertainment, (3) status and information and (4) simulation (e.g., training, and games). So far the electronic presentation market is being driven by the pervasiveness of software that has put sophisticated presentation techniques into the hands of the average PC user. Normally three of projection display techniques are used widely, i.e. oil film, CRT-LCD, and AM-LCD. Oil film projectors is developed in early 1940s and have been the workhorse for applications that require projection displays of the highest brightness. But the oil film projector has a number of limitations including size, weight, power, setup time, stability, and maintenance. In response to these limitations, LCD-based technologies have challenged the oil film projector. These LCD-based projectors are of two general types: (1) CRT-addressed LCD light valves and (2) active-matrix (AM) LCD panels. LCD-based projectors have not provided the perfect solution for the entire range of high-brightness applications. CRT-addressed LCD light valves have setup time and stability limitations. Most active-matrix LCDs used for high-brightness applications are transmissive and, because of this, heat generated by light absorption cannot be dissipated with a heatsink attached to the substrate. This limitation is mitigated by the use of large-area LCD panels with forced-air cooling. However, it may still be difficult to implement effective cooling at the highest brightness levels. In response to these and other limitations, as well as to provide superior image quality under the most demanding environmental conditions, high brightness projection display systems have been developed based on Digital Light Processing (DLP) technology. DLP is based on a microelectromechanical system (MEMS) device known as the Digital Micromirror Device.