28-12-2014, 03:17 PM
i need the new trends in lcos technology 2014.could you plese help me?
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download lcos technology ppt
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i need the new trends in lcos technology 2014.could you plese help me?
13-03-2017, 02:38 PM
Liquid crystal over silicon (LCoS or LCOS) is a miniaturized reflective active matrix liquid crystal display or "micro display" that uses a liquid crystal layer on top of a silicon back plane. It is also known as a spatial light modulator. LCoS was initially developed for projection televisions, but is now used for selective wavelength switching, structured lighting, near-eye screens and optical pulse configuration. By way of comparison, some LCD projectors use transmissive LCD, allowing light to pass through the liquid crystal.
In an LCoS display, a CMOS chip monitors the voltage on square reflective aluminum electrodes buried just below the surface of the chip, each controlling a pixel. For example, a chip with XGA resolution will have 1024x768 plates, each with an independently addressable voltage. Typical cells are about 1-3 centimeters square and about 2 mm thick, with a pitch of pixels as small as 2.79 μm. A common voltage for all pixels is supplied by a transparent conductive layer made of indium oxide and tin on the cover glass.
LCOS combines these two ideas. It is a reflective technology that uses liquid crystals instead of individual mirrors. In LCOS, the liquid crystals are applied to a reflective mirror substrate. As the liquid crystals open and close, light is reflected from the mirror or blocked. This modulates the light and creates the image.
LCOS-based projectors typically use three LCOS chips, one to modulate light in the red, green, and blue channels. In this it is similar to an LCD projector that uses three LCD panels. Both LCD and LCOS projectors deliver the red, green and blue components of the light to the screen simultaneously. There is no spinning color wheel used in these projectors as there are in single-chip DLP projectors.
LCOS technology is usually very high resolution, and is usually higher in price than most LCD and DLP products. There is no such thing as a SVGA LCOS resolution projector, and we know of only a very rare XGA resolution machine. Generally LCOS machines begin to appear in the SXGA (1365x1024) and higher resolution class. So by definition they are not cheap. Also LCOS projectors are particularly compact compared to portable LCD and DLP units. The lightest LCOS machines to date weigh about 12 lbs. But they can be much bigger and heavier than that. Therefore, due to the inherent high-resolution and largest form factors, LCOS technology has not yet been adapted for the cheapest portable projectors in the mass market. Todays LCD and DLP projectors are sold in much higher unit volumes and are more suitable for mobile presentation, classroom and cheap home theater. For this reason LCD and DLP technologies receive much more attention. Since LCOS is not sold in volumes than LCD and DLP, many assume that it is not as good as LCD or DLP. Nothing could be more wrong. Many knowledgeable videophiles looking for the most stylish home theater solutions opt for products that use LCOS technology because of their unique blend of performance features that neither LCD nor DLP offer.
In an LCoS display, a CMOS chip monitors the voltage on square reflective aluminum electrodes buried just below the surface of the chip, each controlling a pixel. For example, a chip with XGA resolution will have 1024x768 plates, each with an independently addressable voltage. Typical cells are about 1-3 centimeters square and about 2 mm thick, with a pitch of pixels as small as 2.79 μm. A common voltage for all pixels is supplied by a transparent conductive layer made of indium oxide and tin on the cover glass.
LCOS combines these two ideas. It is a reflective technology that uses liquid crystals instead of individual mirrors. In LCOS, the liquid crystals are applied to a reflective mirror substrate. As the liquid crystals open and close, light is reflected from the mirror or blocked. This modulates the light and creates the image.
LCOS-based projectors typically use three LCOS chips, one to modulate light in the red, green, and blue channels. In this it is similar to an LCD projector that uses three LCD panels. Both LCD and LCOS projectors deliver the red, green and blue components of the light to the screen simultaneously. There is no spinning color wheel used in these projectors as there are in single-chip DLP projectors.
LCOS technology is usually very high resolution, and is usually higher in price than most LCD and DLP products. There is no such thing as a SVGA LCOS resolution projector, and we know of only a very rare XGA resolution machine. Generally LCOS machines begin to appear in the SXGA (1365x1024) and higher resolution class. So by definition they are not cheap. Also LCOS projectors are particularly compact compared to portable LCD and DLP units. The lightest LCOS machines to date weigh about 12 lbs. But they can be much bigger and heavier than that. Therefore, due to the inherent high-resolution and largest form factors, LCOS technology has not yet been adapted for the cheapest portable projectors in the mass market. Todays LCD and DLP projectors are sold in much higher unit volumes and are more suitable for mobile presentation, classroom and cheap home theater. For this reason LCD and DLP technologies receive much more attention. Since LCOS is not sold in volumes than LCD and DLP, many assume that it is not as good as LCD or DLP. Nothing could be more wrong. Many knowledgeable videophiles looking for the most stylish home theater solutions opt for products that use LCOS technology because of their unique blend of performance features that neither LCD nor DLP offer.
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