Varitronix Limited

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LCOS Projection System for 3D Scanning
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Varitronix History and Background

• Hong Kong company established in 1978
• Public in 1991, floating its shares on the Stock
  Exchange of Hong Kong (stock code 710)
• Product range from sophisticated automotive and
  telecommunications, to industrial and consumer
  applications
• Working on LCOS technology since 1993
• Headquartered in Hong Kong, major production
  bases are located in Heyuan and Shenzhen in
  Guangdong Province

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Why Liquid Crystal on Silicon
Microdisplay(LCOS)

• LCOS (Liquid Crystal On Silicon) is a miniature
  display developed on the CMOS platform.
• Its technical and economic advantages propel it
  to become the winning technology for high
  resolution display applications
• Lower cost-per-pixel than TFT, DLP
• Mature CMOS technology for high yield
• Higher aperture ratio and reflective
• technology with higher optical throughput
• Low entrance barrier
• (for a team with LCD experience)

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Advantage of LCOS projection system for 3D
scanning

• Low noise digital drive panel
• Very high resolution, up to 2 million pixels
• Easily and accurately to achieve phase shifted
  computer-generated sinusoidal fringe patterns
• High speed
• Low cost
• High light efficiency

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Strengths Varitronixs LCOS panel used in 3D
scanner

• Solid experience in LCOS projection system
• Support USB interface
• Customization of frame rate and gray levels in
  order to fit customers different products
  requirements
• Simple and compact optical core, suitable for
  small to large 3D scanning equipments
• Synchronization signal is provided for camera
  synchronization
• Very high resolution, up to HD 1920 x 1280

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LCOS panel specifications summary

• Varitronix VMD5100 LCOS panel
• Monochrome active matrix
• 0.7 HD resolution (1280 x 720)
• Pixel size 12 mm x 12 mm
• Display Size 15.4mm x 8.6mm
• Aperture ratio gt91

• Varitronix VMD6100 LCOS panel
• Monochrome active matrix
• 0.82 HD resolution (1920 x 1280)
• Pixel size 9 mm x 9 mm
• Display Size 17.3mm x 11.5mm
• Aperture ratio 90

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Advantage of LCOS projection system among
different technologies
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Schematic diagram of a LCOS projection system
Polarizing Beam Splitter (PBS)
LCOS Microdisplay
Projection Lens
Integration Lens
Projection Lamp
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Fringe pattern generated by LCOS projection system
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Ordinary 3-D scanning system using LCOS
Projection System
Projected Fringe Pattern
LCOS Projection System
USB connection
CCD Camera
Computer
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Interface Electronics

• Proprietary driving scheme for faster fringe
  pattern generation
• Controlled by computer USB interface
• Provide synchronization signal
• Digital signal processing
• Easy to control

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• Thank You