Grating Light Valve (GLV) Technology
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28-01-2009, 01:34 PM

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 seminar and presentation 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...
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27-08-2009, 12:44 PM

GLV's basis technology

.pdf   Grating Light Valve.pdf (Size: 205.58 KB / Downloads: 250)

.pdf   Optical Performance of Grating Light Valve.pdf (Size: 404.53 KB / Downloads: 187)

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 project and implimentationion onto a screen (project and implimentationor and rear-project and implimentationor).

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Grating Light Valve (GLV) Technology

.docx   akhi.docx (Size: 537.65 KB / Downloads: 32)


The objective of this paper is to detail the Grating Light Valve technology and demonstrate its flexibility in attaining high performance in a variety of optical systems and applications, concentrating particularly on its application toward project and implimentationion display systems. The GLV technology represents a unique approach to light modulation and offers remarkable performance in terms of contrast, efficiency, switching speed, and cost. The electro-mechanical response of the
GLV device can be tuned through various design and operational modes to deliver desired performance for a given application. The design and fabrication of a linear array module of 1,088 GLV pixels is described. This module enables a
Scanned Linear GLV Architecture for HDTV project and implimentationion products. The flexibility of the GLV technology and the Scanned Linear GLV Architecture can support line sequential and frame sequential color, as well as 3-valve color systems.

Fundamental concepts

A Grating Light Valve (GLV) device consists of parallel rows of reflective ribbons. Alternate rows of ribbons can be pulled down approximately one-quarter wavelength to create diffraction effects on incident light (see figure 1). When all the ribbons are in the same plane, incident light is reflected from their
surfaces. By blocking light that returns along the same path as the incident light, this state of the ribbons produces a dark spot in a viewing system. When the (alternate) movable ribbons are pulled down, however, diffraction produces light at an angle that is different from that of the incident light. Unblocked, this light
produces a bright spot in a viewing system.

Building the GLV device

The following describes the materials, dimensions and packaging of a GLV device capable of implementing a high-resolution display. The entire GLV device is designed to be built using mainstream IC fabrication technology (e.g. photolithographic masking, deposition, etching, metalization, etc.) to create the
micro electromechanical systems (MEMS) that make up the GLV device. The GLV ribbons are built using silicon nitride, then coated with a very thin layer of aluminum (see figure 2). By making the aluminum layer very thin, one avoids some of the surface roughness that otherwise scatters the light reducing the contrast ratio.

Controlling the GLV device

To control a GLV-based device, one simply directs the up and down ribbon movement of this two-state technology. As mentioned previously, the ribbons will naturally assume the up state. To pull them down, one must apply a voltage difference (e.g. the switch-down voltage, V2) between the movable ribbons and
bottom electrodes. Interestingly, the ribbons maintain their down state even as the voltage differential is reduced. Thus, one can pull the ribbon down with a switch-down voltage (V2), and maintain that state with bias voltage, Vb, such that V1<Vb<V2 volts (see figure 5), where V1 is the switch-up voltage at which the
ribbon returns to its up state.

Several of the unique features of the GLV device described above, particularly its fast switching time, high power handling capability, and analog addressability, enable a novel display architecture that offers significant advantages compared to other project and implimentationion display architectures. A linear GLV array can be used to modulate a single column of image data, while a mechanical scan mirror is used to sweep that column across the field of view. Updating the video data appropriately during
the scan can effectively render a full two-dimensional image. The Scanned Linear GLV Architecture was introduced previously . A more complete description of the linear GLV array module and its associated electronic drivers is given


The Grating Light Valve technology offers unique performance among spatial light modulator technologies. Particularly compelling are its extremely fast switching speed, its ability to be addressed in an analog fashion, and its ability to withstand
very high optical power densities. These attributes can be exploited to achieve a novel project and implimentationion display architecture, which in turn offers a number of system cost and performance advantages over conventional project and implimentationion display systems that are
based on either 2-D spatial light modulators or scanned point systems.

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22-12-2012, 03:13 PM

plz send me ppt and doc of GLV technology

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