1. Comparison of Projection Technologies

2. Three Core Projection Technologies A Comparison…
DLP projector (single-chip)
LCD projector (three-panel)
Micromirror device
Transmissive LCD panels
LCOS projector (three-panel)
LCOS reflective LCD panels

3. Option 1: LCD (Liquid Crystal Display)
LCD projectors contain 3 separate LCD panels, one each primary colour (red, green and blue).
However, the LCD drive circuit casts a shadow on the image in the form of a grid – the ‘lattice effect’, which lowers the overall image quality
Drive circuit
obstructs light
LCD
Liquid Crystal
Liquid Crystal Drive Circuit
Transmissive LCD Panel
Aperture Ratio: Around 65-73%

4. Option 2: DLP (Digital Light Processing)
Mass-market projectors use a single DMD chip (Digital Micro-Mirror Device)
Chip consists of thousands of tiny mirrors, which wobble back and forth,
Light is reflected into lens path to turn each pixel on, and away to turn pixel off
The Colour wheel causes colour break-up (often referred to as the ‘Rainbow Effect’)
Single-Chip DLP Panel
Aperture Ratio: Approximately 82%
DLP® board
Processor
Memory
Digital Micro- mirror Device (DMD)
Projection Lens
Mass-market projectors using DLP (micro mirror devices) have a spinning colour wheel, and each pixel produces a sequential RGB display. One chip DLP projectors output RGB colors sequentially (for example, Red is output only 1/3 of the time), so colors other than white are very dark, resulting in unnatural colors and poor gradation.
Colour wheels cause colour break-up, a phenomenon caused when RGB after-images are visible near highlight portions of the image. This is enough to render the image totally unwatchable for some people.
Shaping Lens
Screen
Colour filter (colour wheel)
Light Source
Condensing Lens
Digital Micro-Mirror Device (DMD)

5. DLP (Digital Light Processing) – continued…
DLP® Technology – Key Components
Colour filter (colour wheel, 4 segment)
Digital Micro-mirror Device (DMD)
Mirror –10º
Mirror +10°
Mirrors
Mass-market projectors using DLP (micro mirror devices) have a spinning colour wheel, and a each pixel produces a sequential RGB display. Colour wheels cause colour break-up, a phenomenon caused when RGB after-images are visible near highlight portions of the image. This is enough to render the image totally unwatchable for some people.
DLP® chip

6. Option 3: LCOS (Liquid Crystal on Silicon)
LCOS, or Liquid Crystal on Silicon, combines the best of both worlds
Projector contains three panels, just like LCD-based products
BUT panels are reflective, just like DLP-based products
NO lattice effect and NO colour break – the ideal solution
Reflective LCOS Panel: Aperture Ratio: Over 90%
LCOS
Liquid Crystal
Reflective
Mirror
Liquid Crystal Drive Circuit
Light is reflected before reaching the
drive circuit

7. reflective technology
LCOS Advantages for Image Quality What makes Canon XEED projectors different?
Advantages:
LCOS Projector
(three-panel)
Combination of
transmissive &
reflective technology
Smooth seamless image
Good colour gradation and production
No rainbow effect
Fast pixel refresh
LCOS uses liquid crystal on a reflective silicon base with the drive circuitry placed behind the panel itself .
LCOS offers the following advantages:
First, smooth and seamless images.
Second, LCOS offers great colour gradation and reproduction.
Thirdly, LCOS projectors have fast refresh rate.
And lastly no rainbow effect.

8.   LCD, DLP and LCOS Technologies Compared LCD DLP LCOS
Panel technology
Lattice effect
Obvious (70% Aperture Ratio)
Minimal (82% Aperture Ratio)
Negligible (90% Aperture Ratio)
Rainbow effect
None
Obvious
None
LCOS combines the strengths of technology found in other projectors:
• Liquid Crystal Display (LCD) – same as laptop screens
• Digital Light Processor (DLP) – a reflective light switch chip
LCOS – gives all of their advantages and none of the disadvantages. As a result X-ray images show more detail and have higher contrast, with smoother greyscales.
Colour gradation
Good
Poor
Excellent
Only Canon LCOS panel technology wins on all three counts! 8

9. Canon XEED - Image Display Without Compromise
LCD projector
DLP projector
LCOS projector
Grid-like wiring can be seen
overall
Expression of yellows and
grayscales is weak
Also richly expresses gradation
of neutral colors and dark tones
●Grid-like wiring can be seen
●There is a limit to increasing contrast
●Increasing resolution is difficult
●Contrast reduction due to mirror ambient light
●Colour breaks occur
●Weak gradation expression is a trend of black degradation / white blowout
●Grid-free seamless video
●High resolution, high brightness, high contrast, yet compact
●Superior video projection with minimal afterimage