Question

how pictures of projector appear on screen? ​

Answer 1

Answer:Everyone knows real life is nothing like television—possibly because TV screens are so much smaller than the things we see around us. You couldn't show life-sized people, cars, sharks, trees, and skyscrapers on a glass-fronted box 30cm (12 inches) high even if you wanted to. But if you'd like your entertainment to feel more realistic, one option is to swap your TV set for a projector that throws giant images of TV pictures onto the wall. Watching TV then becomes more like watching a movie—in the comfort and privacy of your own home. Projection TV is also very useful in business meetings and college lectures where a whole room full of people need to watch a picture at the same time. You can use it to show live TV pictures, video and DVD recordings, or even the output from a computer screen. Let's take a closer look at the different kinds of TV projector and how they work

1. Developed in the mid-1980s by Texas Instruments scientist Dr Larry J. Hornbeck, DLP technology is based on an amazingly clever microchip called a digital micromirror device (DMD). A DMD chip contains about two million tiny mirrors arranged in a square grid. Each mirror is less than one fifth the diameter of a human hair, and it's mounted on a microscopic hinge so it can tilt either one way or another. A bright lamp shines onto the DMD mirror chip and an electronic circuit makes the mirrors tilt back and forth. If a mirror tilts toward the lamp, it catches the light and reflects it off toward the screen, creating a single bright dot of light (equivalent to a pixel of light made by a normal TV); if a mirror tilts away from the light source, it can't catch any light, so it makes a dark pixel on the screen instead. Each mirror is separately controlled by an electronic switch so, working together, the two million mirrors can build up a high-resolution image from two million light or dark dots.
3. To make color images, DLP projectors need an extra bit of technology: they have a spinning colored wheel inserted into the light path, which can color the pixels red, blue, or green. Combined with the tilting mirrors, the color wheel makes a front-projected TV picture from millions of pixels of every possible color.

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