![]() ![]() There were single-panel LCoS displays in production: One by Philips and one by Microdisplay Corporation. The light is additionally polarized by beam splitters.īoth Toshiba's and Intel's single-panel LCOS display program were discontinued in 2004 before any units reached final-stage prototype. The white light is separated into three components (red, green and blue) and then combined back after modulation by the 3 LCoS devices. While less expensive, single-panel projectors require higher-speed display elements to process all three colors during a single frame time, and the need to avoid color breakup makes further demands on the speed of the display technology. If the frequency of the color fields is lower than about 540 Hz, an effect called color breakup is seen, where false colors are briefly perceived when either the image or the observer's eye is in motion. As each color is presented, a color wheel (or an RGB LED array) illuminates the display with only red, green or blue light. In single-panel designs, one display chip shows the red, green, and blue components in succession with the observer's eyes relied upon to combine the color stream. In three-panel designs, there is one display chip per color, and the images are combined optically. There are two broad categories of LCoS displays: three-panel and single-panel. Sony and JVC both produce and market front-projection displays that use three LCoS panels, as well as Canon, with XEED and REALiS projectors.ĭevelopers and manufacturers who have left the LCoS imaging market include: Intel, Philips, MicroDisplay Corporation (the only company to successfully bring to market a single-panel LCoS television ), S-Vision, Colorado Microdisplay, Spatialight, Syntax-Brillian. Every company which produces and markets LCoS rear-projection televisions uses three-panel LCoS technology. As of October 2013, LCoS-based rear-projection televisions are no longer produced.Ĭommercial implementations of LCoS technology include Sony's Silicon X-tal Reflective Display (SXRD) and JVC's Digital Direct Drive Image Light Amplifier (D-ILA/). Whilst LCoS technology was initially touted as a technology to enable large-screen, high-definition, rear-projection televisions with very high picture quality at relatively low cost, the development of large-screen LCD and plasma flat panel displays obsoleted rear projection televisions. Sony has made it to market (December 2005) with the Sony-VPL-VW100 or "Ruby" projector, using SXRD, 3 LCoS chips each with a native resolution of 1920×1080, with a stated contrast ratio of 15,000:1 using a dynamic iris. These plans were cancelled in October 2004. Starting in the late 1990s a number of companies attempted to develop products for both near-eye and projection applications.Īt the 2004 CES, Intel announced plans for the large scale production of inexpensive LCoS chips for use in flat panel displays. General Electric first demonstrated a low-resolution LCoS display in the late 1970s. A common voltage for all the pixels is supplied by a transparent conductive layer made of indium tin oxide on the cover glass. Typical cells are about 1–3 centimeters square and about 2 mm thick, with pixel pitch as small as 2.79 μm. For example, a chip with XGA resolution will have 1024x768 plates, each with an independently addressable voltage. In an LCoS display, a CMOS chip controls the voltage on square reflective aluminium electrodes buried just below the chip surface, each controlling one pixel. By way of comparison, some LCD projectors use transmissive LCD, allowing light to pass through the liquid crystal. LCoS was initially developed for projection televisions but is now used for wavelength selective switching, structured illumination, near-eye displays and optical pulse shaping. It is also referred to as a spatial light modulator. Liquid crystal on silicon ( LCoS or LCOS) is a miniaturized reflective active-matrix liquid-crystal display or "microdisplay" using a liquid crystal layer on top of a silicon backplane. For the energy economics metric, see levelized cost of storage. ![]()
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