2. Category:
1. Video Displays
Eg: LCD,LED,CRT,DLP
2. Non-video displays
Eg: Seven-segmentDisplay
3. 3D Display
Eg: Multiscopic, Hologram
4. Static Media
Eg: Movie Projector, LaserBeam, SlideProjector
3. Digital Light Processing (DLP)
Digital Light Processing (DLP) is a type of
MEMS(Micro Electro Mechanical
System)technology that uses a digital micromirror
device(DMD).
4. Introduction to DLP:
• It provides all-digital projection displays that
offer superior picture quality in terms of
resolution, brightness, contrast.
• This provides an overview of the digital video
processing solutions like scan conversion, picture
enhancements, color processing.
• DLP™ technology is in use wherever visual
excellence is in demand.
9. How DLP works?
1. Signal Conversion
2. Gray Scale Image
3. Color Creation
10. Step 1: Signal Compression
• Accepts both analog or digital signal
• All signals must be converted into digital
• The digital signal, enables mirrors to tilt
towards “On” or away from “Off” light source.
11. Step 2: Gray Scale Image
• On” – light Pixel vs. “Off” – Dark Pixel
• Mirror switched on more frequently than off – Reflects Light
Gray Pixel
• Rapid Switching allows up to 1024 shades of gray reflections
• Digitalized video signal entering DMD get converted into
highly detailed gray scale image
not present
12. Step 3: Color Creation
• Color is added as white light from the lamp passes through a
color wheel filter
• Color Wheel – RED, GREEN & BLUE
• mirrors on DMD are tilted on for the exact amount of time
required for each basic color
• Only 1 color is shined onto DMD at a time
• When spinning fast enough, human eyes blend alternating
flashes to view “more” colors in the projected image.
•
•
• colour wheel present
15. Advantages:
• Lighter weight than LCD and plasma televisions
• It produces bright, high-contrast images
• It can be projected onto any size screen
• DLP Technology allows for a clear smooth picture with no
glare due to its embossed coating technology:
16. Disadvantages:
• Replacement of the lamp / light bulb in lamp based
units. The average life span of a mercury lamp
averages 2000–5000 hours and the replacement cost
for these range from $99 – 350, depending on the
brand and model.
• Some viewers are bothered by the "rainbow effect" -
particularly in older models.
• May use more electricity, and generate more heat,
than competing technologies.
17. Application:
• Room Projectors, home theater, CRT,
institutional projectors.
• 1-chip DLP Projection System
• 3-chip DLP Projection System
