SEMINAR ON DIGITAL LIGHT PROCESSING

1. SEMINAR ON
DIGITAL LIGHT PROCESSING
Submitted By:
Krishna kumari
MCA 4th Sem(Regular)
Roll no:-1845849(09)

2. CONTENT
• Introduction
• History of Evolution
• Basic components of DLP
• How DLP works?
• Pixel structure of Digital Micro-mirror Device (DMD)cell
• Advantages & Disadvantages
• Applications
• Conclusion
• References

3. Introduction
• It is a revolutionary way to project and display information based on the
Digital Micro Mirror Device (DMD). Digital Light processing was invented
in 1987 by Texas Instruments it creates the final link to display digital visual
information.
• It is available in both front-and rear-projection models. DLP is an excellent
choice for people who watch a lot of sports or fast-action movies because of
the speed at which it creates an image.

4. Continued…
• DMD can be combined with image processing ,memory, a light source and
optics to form a DLP system capable of projecting images with better color
fidelity and consistency than current technology.
• It provide all digital projection displays that offer superior picture quality in
terms of resolution, brightness, contrast.

5. History of innovation:
• DMD was invented in 1987 by Dr. Larry Hornbeck of Texas Instruments.
• In 1993, it named the new technology DLP and formed a separate group
to develop commercial display applications.
• In 1994, TI demonstrated DLP projectors for the first time.
• Since 2000, several DLP technology based products such as projectors,
HDTV’s, “Instant theatre”, etc. were introduced .

6. Why DLP?
• The traditional CRT projectors have RGB tubes which makes the entire
cabinet bulky.
• The LCD projectors use LCD light gates for projecting, which introduces
pixilation effect.
• In order to overcome all the drawbacks of previous techniques, DLP was
developed.

7. Components required for DLP:
• Light source
• Colour wheel
• DMD
• Memory
• Projection lens & screen

8. How DLP works?
• It digitally manipulates light to produce film-like, all-digital images.
• DLP integrates a projection lamp and an electronic video signal from a
source and the processed light produces an all-digital picture.

9. DMD Modulator Structure
• DMD comprises of over one million mirrors, where each mirror represents a
pixel.
• These mirrors reflects light in either of two directions depending on the state
of underlying memory cell.

10. Pixel structure of DMD cell:
• The mirror is rigidly connected to an underlying yoke, which is in turn
connected to the hinges to support posts that attaches the substrate.
• This DMD mirror is electronically driven.

11. Models of DLP:
• One chip DLP systems use a projection lamp to pass white light through a
colour wheel that sends red-green-blue colours to the DMD chip in a
sequential order to create an image onscreen.
Single chip model

12. Three chip model
• In three chip DLP systems use a projection lamp to send white light
through a prism, which creates separate red, green and blue light beams.
Each beam is send to their respective red, green and blue DMD chip to
process the image for display on-screen.

13. Advantages:
• Brighter
-Because it brings more light from lamp to screen.
• Sharper
-As it can produce the closest mirror image of an incoming video of any
resolution.
• Consistent picture quality

14. Disadvantages:
The only real disadvantage of DLP projectors is "rainbow effect."
• The Rainbow Effect often referred to as RBE, is a affect that has some people
seeing flashes of red, green and blue. This is caused by the eye/brain dealing
with the effects of projectors using high speed, spinning colour filter wheels.
• Since a colour wheel is needed for this to occur, the only types of projectors
affected are DLP projectors, since they are single chip devices, and require a
colour wheel to add colour.

15. DLP Vs LCD Projector:
DLP LCD
Implements reflective technology Employs transmissive technology
Smaller, lighter and easily portable Bulkier, not very convenient for
portability
Contrast is higher Contrast is lower
Forms rainbow effect Do not form rainbow effect
Uses LED and standard lamp Uses standard lamp
DLP Vs LCD

16. Applications:
DLPTelevisions
Digital Light Processing Television is a technology that uses one, or
sometimes three, electronic chips called Digital Micro-mirror Devices, or
DMDs, to produce a vivid picture with a high contrast ratio on a high definition
large-screen TV.

17. Conclusion
• We have described the basic processing blocks DLP has a number of potential
uses beyond home theatre, television and film projector.
• Other application that could incorporate its high-definition image creation are
photo finishing , three dimensional visual displays.
• Scientist and developers are likely to discover even more uses for DMDs and
DLP technology in the future.

18. REFERENCES
1. www.ti.com/dlp
2. www.DLP.com/projector glossary
3. Introduction to DLP Technology - Lars a. Yoder
Texas Instruments Ltd
4. Video Processing for DLP System - Vishal & Todd,
Digital Video Product Texas Instruments Ltd