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Some believe widescreen TV and HDTV are the same.
Widescreen is usually defined as having a width to height ratio of 16:9, 16 representing width; 9 representing height.
16:9 is very close to the ratio of a screen in a movie theater so you can display a movie on your TV at full screen size on a 16:9 widescreen TV.
As Widescreen is defined by the width to height ratio in inches, the number of pixels in a comparable ratio is how HDTV is measured.
HDTV is generally defined as a screen that has a minimum of 1024 by 720 pixel-ratio or higher.
The ideal for HDTV is 1920 by 1080. Any screen that has fewer pixels in its display ratio may display Digital TV but not HDTV. HDTV is a high-resolution version of DTV.
Flat Panel TV are direct-view and do not use a rear projection system. A typical model is about 4 inches deep and can conveniently be mounted to a wall. Most models include a table stand and are about 12 to 14 inches deep when using the table stand. There are two types of flat-panel TV displays - Plasma and LCD.
Plasma offers a bright, sharp, rich image at sizes up to 80 inches (diagonally). Contrast (black levels) is the truest of all the displays. It is most used as a professional display for videoconferences and demonstrations.
LCD is the more recent technology in flat-panel TV and is considered extremely reliable as it has been used for notebook computers, digital cameras, camcorders and pocket TVs with great success. Its main drawback was maintaining image integrity in larger sizes. Since 2003, research has advanced this technology to deliver screen sizes that approach 45 inches (diagonal).
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