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Microcap & Penny Stocks : Microvision (MVIS) -- Ignore unavailable to you. Want to Upgrade?

To: Bux who wrote (3742)	10/28/1999 5:24:00 PM
From: Obewon	Read Replies (1) \| Respond to of 7721

The use of phosphors on TV and CRT screens is necessary to generate the picture which your eyes see, this is not necessary for the VRD. The moving electron beam excites the phosphors and generates the picture on the tube as the beam sweeps by very quickly. A screen is necessary since the electron gun of a CRT cannot beam the picture directly to the eye. The focal length is too far to get that sort of precision. Imagine looking at a TV without a phosphorous screen from 10 feet away. The only thing you would see would be the equivalent of the few pixels that would be between the electron gun and you eye as it sweeps accross your retina...not very useful. However, as you move closer to the electron gun it covers the equivalent of more an more pixels and you would start to see a picture when you got really close (closer than the screen is to the gun). Alternately, consider the phosphor screen to be your retina. At a distance of just a foot from the electron gun (about standard for CRT screens), your eyeball would have to be bigger than a beachball to get the whole picture. VRD systems lasers are much more accurately controlled and fine tuned but still require the beam to paint the entire picture on your retina (which is measured in millimeters across rather than a 17" screen) Another example I could use to explain why phosphors are necessary is that of a movie picture. Stand in front of a screen (between screen and camera) with a motion picture projected on it and look at the projector. What image do you see? Nothing! Its just a really bright light. But if you stand in the audience looking at the screen or even BEHIND the screen you will be able to see the movie depending on the screen material (white or grey is best). This also demonstrates why the VRD can be day-light visible. Note how bright the light it when you are between the screen and the projector looking at the projector. But out in the audience, the picture brightness appears just right, correct? This is because of the scattering of light on the screen. CRT screens experience this same scattering as all the energy that hits the screen is not going into your retina. Instead it is reflected in all directions and all over the room. That is one reason why you can watch TV from many different angles rather than just precisely in front of the tube. As to you question on whether the VRD can scan faster than 100HZ, theoretically yes it can. Whether it does, I don't know or care really since the eye can only perceive around 60-70. Hope this answers you questions. Obewon