NCAP Plastic Liquid Crystal Display (Polymeric LCD)
engineering fundamentals NCAP Plastic Liquid Crystal Display
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Introduction  

Unlike most LCDs which are difficult to read in bright sunlight, the NCAPTM Plastic Liquid Crystal Display (Polymeric LCD) actually gets easier to read in brighter light (just like a piece of paper).

For informational displays with many separately controlled segments (such as a digital clock), each part of the liquid crystal panel can selectively be turned 'on.' Furthermore, the amount of translucency is proportional to the voltage applied.

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Further Information  

The heart of the NCAPTM technology is the liquid crystal cell. Normally this cell is black, allowing almost no light through. But when a current passes through it, instantly it turns transparent. Behind this liquid crystal cell is a colored reflective pattern. When the cell turns transparent, the colored print beneath shows through.

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Applications  

NCAPTM plastic displays can be directly applied to where clear, bright displays / control panels are needed such as

  • Information displays
  • Automobiles
  • Gaming machines
  • Household appliances (e.g., microwave oven)
  • Biomedical instruments or other instrumentation
  • Point of sale

Some potential applications for applying the NCAPTM LCD cell include

  • Exhibit displays, billboards, schedule boards
  • Ski goggles, sunglasses
  • Automotive windows, portable sun shade / umbrella
  • Telephone booth, changing room, office window / surgery room, hide home entertainment center
  • Peek through oven window, transparent drawers / kitchen cabinets for easy searching

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Common Specifications  

Common specifications for commercially available NCAPTM plastic displays are listed below:

  Dimension: Up to 39 inch x 1000 ft (LDC cell itself)
Up to 22 inch x 15 inch (NCAPTM Display)
  Color: Available in warm yellow, yellow, green, blue, white, orange, and red. However, There are no technical limitations restricting particular colors.
  Operating Temperature: -20 ~ 85 °C
  Storage Temperature: -50 ~ 85 °C
  Voltage: 24 ±1.2 V
  Frequency: 50 / 60 Hz (25 ~ 120 Hz)
  DC Offset: ±350 mVdc
  Optical Performance: Color difference (1976 CIE UCS):
Warm yellow = 73; Red = 106;
  Response Time: Time on at 25°C = 6 ms; Time off at 25°C = 16 ms
Time on at 0°C = 42 ms; Time off at 0°C = 84 ms

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Pros and Cons  

  • Pros:
  - Brighter than common LCD displays
  - Wide uniform 160° viewing angle
  - Thin and flexible construction, curvable
  - Can make large distributed display areas
  - Durable and Reliable (no moving parts)
  - Rugged (monolithic Polymeric construction vs. glass in common LCD)
  - Low power consumption (solid state)
  - Easy to Design, inexpensive customization
  • Cons:
  - More expensive
  - Limited data for outdoor and hazardous environment usages

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