Projection TV : What is it?
| Projection TVs display images by creating small pictures and enlarging them on the screen using lights and lens systems. This method allows larger screen sizes without making them heavy and bulky, unlike traditional cathode ray tube (CRT) sets. Most projection TVs are also capable of high-definition (HD) and digital signal reception. They also support additional features, such as surround sound, pay-multimedia, and interactive TV, although these usually require a subscription service. |
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Kinds of Projection TVs include the following: |
Front projection TVs
- Front projection TVs use a transmissive system, where light travels along the projector and picks up the image in a linear pattern. They project images directly onto a screen.
- They consist of an LCD or DLP projector and a separate screen, although the image can be displayed on any flat surface. In some systems, a roll-up screen or specially painted wall is used in place of the screen.
- The projector is usually placed on a shelf or mounted on the wall or ceiling.
- This allows extremely large displays measuring as much as 119 inches, making them ideal for advanced home theaters.
Rear projection TVs
- Rear-projection TVs are arranged so that the light bounces on the image and reflects it onto the back of a screen.
- They come in a single unit, with the projector contained entirely within the TV set.
- They may also come with a separate screen and projector, although this is mode commonly used in theaters and classrooms.
- Earlier models used CRT projectors, but most systems now use LCD and DLP for a more compact design.
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Resolution and aspect ratio: Choose a projection TV with a resolution of 1280 x 720 and a 16:9 aspect ratio if you want to watch HDTV channels. This can also display standard channels, but if you do not have an HDTV subscription, you can get a smaller screen starting 640 x 480 with a minimum aspect ratio of 4:3.
Contrast ratio: Choose a projection TV with a high contrast ratio, or the contrast between the deepest blacks and brightest whites. DLP systems are capable of producing absolute blacks, but LCD projectors produce only dark grays. Look for a contrast ratio of 800:1 or higher for a wider range of colors.
Viewing angle: Choose a projection TV that can be viewed from different angles without blurring or distorting the image. This is especially important for large home theaters with scattered seating. Convex glass lenses usually have a smaller viewing angle than flat-screen models.
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