LCD HDTV Televisions

By Robert Silva
Presented by HDTV Shop 

An LCD TV is a flat panel television that utilizes the same basic Liquid Crystal Display technology that has been in used for some time in cell phones, camcorder viewfinders, and computer monitors.

LCD panels are made of two layers of a glass-like material, which are polarized, and are “glued” together. One of the layers is coated with a special polymer that holds the individual liquid crystals. Electric current is then passed through individual crystals, which allow the crystals to pass or block light to create images.

LCD crystals do not produce their own light, so an external light source, such as florescent bulb is needed for the image created by the LCD to become visible to the viewer.

Unlike standard CRT and Plasma televisions, there are no phosphors that light up, and, thus LCD panels are thin and require less power to operate. Because of the nature of LCD technology, there is no radiation emitted from the screen itself, unlike traditional televisions.

Also, without the need for a picture tube, LCD televisions can be made very thin, thus allowing them to hung on a wall or placed on small stand on top of a table, desk, dresser, or cabinet very easily.

Combining the above technology with the features of a traditional television, such as, AV input/output connectivity, side or bottom mounted loudspeakers, TV tuner, and traditional television adjustment controls, bring to life a concept that is becoming a popular option for TV and home theater viewing.

Are All LCD Televisions Also HDTVs?

Almost all LCD Televisions are HDTVs. However, some of the smaller screen sets may not be.

In order for any Television to be classified as an HDTV, the television must be able to display a vertical resolution of at least 720 lines, represented as a 1280×720 pixel field (1280 pixels across the screen and 720 pixels down the screen). Some smaller LCD TVs sets are referred to as EDTVs (Extended or Enhanced Definition televisions) as they only display a resolution lower than that of 720 lines.

EDTVs typically have a native pixel resolution of 852×480 or less. 852×480 represents 852 pixels across (left to right) and 480 pixels down (top to bottom) on the screen surface. LCD TVs that are capable of displaying HDTV signals directly have a native pixel resolution of 1280×720 (where 720 also represents the number of lines from the top to bottom of the screen) or higher.

Since LCD televisions have a finite number of pixels (referred to as a fixed-pixel display), signal inputs that have higher resolutions must be scaled to fit the pixel field count of the particular LCD display. For example, a typical HDTV input format of 1080i needs a native display of 1920×1080 pixels for a one-to-one point display of the HDTV image. Also, since LCD Television only display progressively scanned images, 1080i source signals are always either deinterlaced to 1080p or scaled down to 768p, 720p, or 480p depending on the native pixel resolution of the specific LCD television.

However, if your LCD television only has a pixel field of 852×480 or 1024×768, the original HDTV signal must be scaled to fit the 852×480 or 1024×768 pixel count on LCD screen surface. HDTV signal inputs have to be scaled down to fit the LCD Television’s native pixel field.

In conclusion, when shopping for a LCD Television, make sure you check to see if it is an EDTV or an HDTV. 

Read more article : LCD 52

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This entry was posted on Saturday, January 9th, 2010 at 7:03 am and is filed under Lcd Tv, Technical Information. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.