Thread Rating:
  • 0 Vote(s) - 0 Average
  • 1
  • 2
  • 3
  • 4
  • 5
Digital Light Processing
Post: #1

Large-screen, high-brightness electronic projection displays serve four broad areas of application: (1) electronic presentations (e.g., business, education, advertising), (2) entertainment (e.g., home theater, sports bars, theme parks, electronic cinema), (3) status and information (e.g., military, utilities, transportation, public, sports) and (4) simulation (e.g., training, games). The electronic presentation market is being driven by the pervasiveness of software that has put sophisticated presentation techniques (including multimedia) into the hands of the average PC user.

A survey of high-brightness (>1000 lumens) electronic projection displays for comparing the already existing three types of projection display technologies namely, Oil film, CRT-LCD, and AM-LCD was conducted. Developed in the early 1940s at the Swiss Federal Institute of Technology and later at Gretag AG, oil film projectors (including the GE Talaria) 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-bright-ness applications are transmissive and, because of this, heat generated by light absorption cannot be dissipated with a heat sink 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 technology. DLP is based on a micro electro mechanical system (MEMS) device known as the Digital Micro mirror Device (DMD). The DMD, invented in 1987 at Texas Instruments, is a semiconductor-based array of fast, reflective digital light switches that precisely control a light source using a binary pulse modulation technique. It can be combined with image processing, memory, a light source, and optics to form a DLP system capable of projecting large, bright, seamless, high-contrast color images.

The Mirror as a Switch
The DMD light switch is a member of a class of devices known as micro electromechanical systems. Other MEMS devices include pressure sensors, accelerometers, and micro actuators. The DMD is monolithically fabricated by CMOS-like processes over a CMOS memory. Each light switch has an aluminum mirror, 16 ?m square that can reflect light in one of two directions depending on the state of the underlying memory cell. Rotation of the mirror is accomplished through electrostatic attraction produced by voltage differences developed between the mirror and the underlying memory cell. With the memory cell in the on state, the mirror rotates to +10 degrees. With the memory cell in the off state, the mirror rotates to .10 degrees. A close-up of DMD mirrors operating in a scanning electron microscope (SEM). By combining the DMD with a suitable light source and projection optics (Figure 6), the mirror reflects incident light either into or out of the pupil of the projection lens by a simple beam-steering technique. Thus, the state of the mirror appears bright and the state of the mirror appears dark. Compared to diffraction-based light switches, the beam-steering action of the DMD light switch provides a superior tradeoff between contrast ratio and the overall brightness efficiency of the system.

By electrically addressing the memory cell below each mirror with the binary bit plane signal, each mirror on the DMD array is electrostatically tilted to the on or off positions. The technique that determines how long each mirror tilts in either direction is called pulse width modulation (PWM). The mirrors are capable of switching on and off more than 1000 times a second. This rapid speed allows digital gray scale and color reproduction. At this point, DLP becomes a simple optical system. After passing through condensing optics and a color filter system, the light from the projection lamp is directed at the DMD. When the mirrors are in the on position, they reflect light through the projection lens and onto the screen to form a digital, square-pixel projected image.
Post: #2
to get information about the topic "digital light processing" full report ppt and related topic refer the link bellow

Important Note..!

If you are not satisfied with above reply ,..Please


So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: dmd amusements, digital light processing and mems, light processing company, site seminarprojects com digital light processing seminar report, dmd acronym, dmd dds, ieee paper for digital light processing,

Quick Reply
Type your reply to this message here.

Image Verification
Image Verification
(case insensitive)
Please enter the text within the image on the left in to the text box below. This process is used to prevent automated posts.

Possibly Related Threads...
Thread: Author Replies: Views: Last Post
  Digital Signature Full Seminar Report Download computer science crazy 20 14,034 16-09-2015 02:51 PM
Last Post: seminar report asees
  Image Processing & Compression Techniques (Download Full Seminar Report) Computer Science Clay 42 19,695 07-10-2014 07:57 PM
Last Post: seminar report asees
  On-line Analytical Processing (OLAP) computer science crazy 2 2,573 01-04-2014 11:11 PM
Last Post: seminar report asees
  Hardware for image processing - Basics Eye – Human vision sensor ppt computer topic 0 685 25-03-2014 11:12 PM
Last Post: computer topic
Question Space-time Adaptive Processing (STAP) computer science crazy 2 2,272 16-10-2013 03:09 PM
Last Post: Guest
  sketch image match to digital image arma 2 738 30-06-2013 12:24 PM
Last Post: Guest
Photo Digital Watermarking Full Seminar Report Download computer science crazy 83 48,459 06-02-2013 12:33 PM
Last Post: Guest
  Digital Image Watermarking project report helper 3 4,679 19-12-2012 11:48 AM
Last Post: seminar details
  Digital Signature Guidelines Electrical Fan 1 1,083 27-11-2012 12:06 PM
Last Post: seminar details
  digital image processing project topics 1 1,764 19-11-2012 01:46 PM
Last Post: seminar details