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Grating Light Valve (GLV) Technology
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Display devices form an important group of devices in the electro industry. With the evolution of high definition TV (HDTV), video conferencing and other advancements in video applications, their importance is increasing. Traditionally cathode ray tubes (CRTs) are used in display devices. But the industry is searching for devices with high resolution and fill ratios that cannot be achieved in CRTs. LCDs can be use an alternative but they are not cost effective. An entirely new type of devices based on Grating Light Valve technology solves all the problems concerning resolution, fill ratio, cost, size and consumption. In addition to this GLV devices can provide digital gray scale and color reproduction. The GLV technology is based on micro electromechanical system (ME technology and can be manufactured using mainstream IC fabrication technology. providing controlled diffraction of incident light, a GLV device will produce bright dark (or even coloured) pixels in a display system. The seminars should cover, 1. Fundamental concepts 2. Architecture of GLV 3. Controlling the GLV device 4. Applying the GLV technology 5. Comparing the GLV technology
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hey dude, i am intrested in this topic... can u mail/provide me with the entire report/ppt of this subject plzzz... thanksss...
Post: #5
GLV's basis technology


The GLV device is built on a silicon wafer and consists of parallel rows of highly reflective micro-ribbons “ ribbons of sizes of a few µm with a top layer of aluminium “ suspended above an air gap that are configured such that alternate ribbons (active ribbons are interlaced with static ribbons) can be dynamically actuated. Individual electrical connections to each active ribbon electrode provide for independent actuation. The ribbons and the substrate are electrically conductive so that the deflection of the ribbon can be controlled in an analog manner: When the voltage of the active ribbons is set to ground potential, all ribbons are undeflected, and the device acts as a mirror so the incident light returns along the same path. When a voltage is applied between the ribbon and base conductor an electrical field is generated and deflects the active ribbon downward toward the substrate. This deflection can be as big as one-quarter wavelength hence creating diffraction effects on incident light that is reflected at an angle that is different from that of the incident light. The wavelength to diffract is determined by the spatial frequency of the ribbons. As this spatial frequency is determined by the photolithographic mask used to form the GLV device in the CMOS fabrication process, the departure angles can be very accurately controlled, which is useful for optical switching applications. (see figure2 for an example).

The switching from undeflected to maximum deflection of the ribbon is really fast; it can switch in 20 nanoseconds which is a million times faster than conventional LCD display devices, and about 1000 times faster than TIâ„¢s DMD technology. This high speed can be achieved thanks to the small size, small mass and small excursion (of a few hundreds of nanometers), of the ribbons. Besides, there is no physical contact between moving elements which makes the lifetime of the GLV as long as 15 years without stopping (over 210 billion switching cycles).


The GLV technology has been applied to wide range of products, from laser-based HDTV sets to computer-to-plate offset printing presses to DWDM components used for wavelength management. Applications of the GLV device in maskless photolithography have also been extensively investigated.


To build a display system using the GLV device different approaches can be followed: ranging from a simple approach using a single GLV device with a white light as a source thus having a monochrome system to a more complex solution using three different GLV devices each for one of the RGB primaries' sources that once diffracted require different optical filters to point the light onto the screen or an intermediate using a single white source with a GLV device such as the one depicted in Figure2. Besides, the light can be diffracted by the GLV device into an eyepiece for Virtual retinal display, or into an optical system for image projection onto a screen (projector and rear-projector).

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