Bookmark and Share

Wednesday, 2 June 2010

Grating Light Valve Display Technology

The Cathode Ray Tube TV set has ruled the consumer electronics world for decades. Now a days every one wants big screens for their entertainment rooms. But bigger a CRT screen, the glass tube will be deeper and the set becomes impossibly heavy and unwieldy when the diagonal measurement of the screen goes beyond about 36 inches. Thus the CRT is destined for a slow but sure decline giving way to many new technologies.

All of us must have noted the red colour of the hero's suit in the movie 'spiderman', the blues of the sky and water scenes were captivating. The dark horse technology behind this is GRATING LIGHT VALVE TECHNOLOGY (GLV).

The original GLV device concepts were developed at Stanford University. Later Silicon Light Machines was found in 1994 to develop and commercialize a range of products based on this technology.

The GLV device is a type of optical micro electromechanical system or MEMS essentially a movable, light reflecting surface created directly on a silicon wafer, utilizing standard semiconductor processes and equipment.


A Grating Light Value (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.

The Grating Light Valve uses reflection and diffraction to create dark
and bright image areas.

If an array of such GLV elements is built, and subdivided into separately controllable picture elements, or pixels, then a white-light source can be selectively diffracted to produce an image of monochrome bright and dark pixels. By making the ribbons small enough, pixels can be built with multiple ribbons producing greater image brightness. If the up and down ribbon switching state can be made fast enough, then modulation of the diffraction can produce many gradations of gray and\or colors.

There are several means for displaying color images using GLV devices. These include color filters with multiples light valves, field sequential color, and sub-pixel color using "turned" diffraction gratings.


  1. Hey great website! Does running a blog such as
    this take a massive amount work? I've very little understanding of programming but I had been hoping to start my own blog soon. Anyway, should you have any ideas or tips for new blog owners please share. I know this is off subject nevertheless I simply needed to ask. Cheers!

    Here is my blog post; Winston Hector

  2. Wow! At last I got a web site from where I be able to really obtain useful facts regarding my study and knowledge.

    Look into my blog ... Tyler Jaheim

  3. I’m not that much of a online reader to be honest but your blogs really nice, keep it up!
    I'll go ahead and bookmark your site to come back down the road. All the best

    Feel free to visit my webpage :: Miles Israel

  4. Keep on working, great job!

    Also visit my web site :: Nicolas Irving

  5. Fantastic items from you, man. I've remember your stuff previous to and you're just
    extremely excellent. I really like what you've obtained right here, really like what you are saying and the way in which wherein you say it. You are making it enjoyable and you still care for to stay it sensible. I can't wait to learn much more from you.

    This is actually a great website.

    my web site; Walker Jamar

  6. Why people still use to read news papers when in this technological globe
    the whole thing is presented on net?

    My blog Mustafa Jaime

  7. If you are going for finest contents like I do, only go to see
    this web site every day as it offers feature contents, thanks

    My blog Waylon Darrin

  8. If some one needs expert view about running a blog after that
    i propose him/her to go to see this website, Keep up the fastidious job.

    Here is my site Trevin Jamison

  9. Hi there, the whole thing is going nicely here and ofcourse every one is
    sharing facts, that's genuinely excellent, keep up writing.

    Also visit my page ... Ulysses Jabari