LCoS

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LCoS

(Liquid Crystal on Silicon) A technology used to make microdisplays for rear-projection TVs and head-mounted displays (HMDs). Each LCoS chip hosts a grayscale LCD shutter sandwiched between a cover glass and a mirror. The bottom of the cover glass is coated with indium tin oxide that holds a charge. When combined with the charges at the x-y location on the chip's matrix, it causes the liquid crystals to modulate the light for that pixel.

A Mirror Reflects Light Back
Typically used in sets of three (one each for red, green and blue), light is beamed onto the LCoS chip. For the pixels modulated to allow light to pass through, the light hits a mirror and is reflected back to a color filter. The output of the three color filters is combined and magnified to the size of the screen.

SXRD, D-ILA and HD-ILA
Silicon X-tal Reflective Display (SXRD) and Direct Drive Image Light Amplifier (D-ILA and HD-ILA) are proprietary LCoS technologies from Sony and JVC respectively. See rear-projection TV and head mounted display.


Liquid Crystal Microdisplays
LCoS uses LCD panels similar to LCD-based units, except that light is reflected back from a mirror behind the panel to color filters before heading to the lenses.







LCoS Chips from Aurora Systems
Also known as "imagers" and "spatial light modulators," LCoS microdisplays are typically less than an inch square, and their pixel pitch is in the 8-20 micron range.These chips have resolutions from 1024x768 to 1280x768. (Image courtesy of Aurora Systems, Inc.)
References in periodicals archive ?
In June 2007 JVC developed a 1.27-inch 4K2K D-ILA device that was the world's smallest device of its kind, having a 6.8 micrometer pixel pitch and 4096 x 2400 pixels, and in February 2008 it began marketing a newly commercialized professional D-ILA projector, DLA-SH4K, incorporating that device.
Through the development of a new production process and new pixel structure for even finer pixels, JVC has now succeeded in developing the 1.75-inch 8K4K D-ILA device, the world's first device to achieve real Super Hi-Vision definition level.
D-ILA is the name given to JVC's proprietary high-performance reflective liquid crystal devices for projectors.
Based on this excellent product, the new high end DLA-HD100 features enhanced 0.7-inch full HD D-ILA devices and wire grid optical engine to enable it to further improve contrast to twice the ratio of the best conventional projectors and attain a native contrast ratio of 30,000:1 for super-smooth images exhibiting deep, true black level without a trace of gray.
Selling prices for blank media and consumer digital electronics including LCD televisions and D-ILA hybrid projection TVs were down significantly, while declines in sales of audio products and CRT televisions also negatively impacted profits.
The latest 0.7-inch D-ILA full HD device is the same size as JVC's 720p (approx.
esponding to this, JVC has developed a 0.7-inch D-ILA full HD device for use in high-resolution projection televisions.