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| | | | | Changing Shape of Television
The Changing Shape of Television
HDTV sets are available today in many shapes, sizes and price ranges and all are designed to fit a certain consumer need. New digital display technology (DDT) is enabling engineers to create wide screen TVs, flat TVs, wall TVs and, eventually, televisions that you can fold up like newspapers.
Here is a layman’s look at the basic terms that explain how digital display technology works:
Direct View TVs consist of a picture
tube called a cathode ray tube (CRT) and range in screen size from less than a foot (measured diagonally) up to about 40”. These sets typically rest on a TV stand or tabletop.
Projection TVs are available in two
basic configurations – front and rear projection.
The most popular are one-piece, self-contained rear projection systems with screen sizes ranging from 40-inches to 80-inches. In rear projection TVs the images are reflected by mirrors inside the set onto the screen. Many rear-projection models come complete with built-in surround sound, multi-channel audio systems that create a home theater experience in one unit.
Alternative, two-piece projection systems employ either front- or rear-firing projectors that can sit on small tables or are permanently mounted on ceilings to cast projected video images on separate video screens. These systems produce pictures of 100-inches and larger.
Currently, most TV projectors – front and rear – use a combination of three CRTs that project images in the red, green and blue color spectrum. It produces large full-color pictures when the three separate images converge on the screen. But new alternatives now further reduce size, eliminate problems related to the misalignment of the CRTs and produce brighter and sharper images.
Liquid crystal on silicon (LCOS), digital light amplification (DLA) and digital light processing (DLP) are examples of these newer display technologies.
Digital Light Processing (DLP)
uses a digital micromirror device to modulate reflected light. An optical semiconductor chip also adds brightness and clarity to a large screen picture. On opening day in 1998, the Texas Rangers baseball team used DLP technology to display an HDTV picture of the game on an 18-foot diagonal screen.
Liquid Crystal on Silicon (LCOS)
technology manages ultra-bright light to deliver high-contrast, sharply focused color images. Utilizing one or three reflective light imagers and a sophisticated prism and lensing system, light is transformed into a laser-like beam and imprinted with a high definition image that is then magnified and displayed in a perfectly aligned wide screen format.
Digital Light Amplification
(DLA) is an electronic valve technology that uses liquid crystal on silicon to enable manufacturers to create a brighter picture on a larger screen.
Flat Panel TVs
can be hung on the wall like a picture. “Flat panel” and “flat screen” often are used interchangeably, but these are two distinct terms. A flat screen TV is not necessarily a flat panel TV. Many CRT displays have a flat screen rather than the traditional curved glass screen, but they are not flat panel and therefore, cannot be hung on the wall. Plasma and liquid crystal displays (LCD) are both flat panel display technologies.
Plasma Display Technology
Does not require a tube and enables manufacturers to create a larger flat-panel TV, up to 60-inches. A plasma display consists of pixels — gas in the plasma state reacts with phosphors in each sub-pixel to produce what engineers call “colored light.” That explains how a plasma TV can display such a clear picture with the lights on.
Liquid Crystal Display (LCD)
technology now is used on everything from digital clocks to microwaves.These thinner displays require less power than CRTs found in most televisions. Many TV makers are using LCDs to create ultra-thin sets that can display HDTV pictures.
CONSUMER BENEFITS OF NEW DISPLAY TECHNOLOGIES:
New digital display technology (DDT) can dramatically improve the clarity and brightness of the picture, particularly in a well-lit room. It will no longer be necessary to turn out the lights to view your favorite movie. DDT sets also provide distortion-free images at the corners and edges of the screen. A DDT set with HDTV will deliver the best picture available on the market. Additionally, the slimness of a flat panel TV will give consumers more options in organizing the home
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