LCD HDTV 2009 Guide
Much like other LCD devices you’re more used to, such as alarm clocks and computer monitors – LCD televisions also utilize a technology based on polarized light, where two polarized panels are located in front of and in back of a thin layer of liquid crystal gel, that is divided up into individual pixels. Each pixel is activated individually thanks to two axis of wires, which polarizes them accordingly.
“Ghosting” used to be a noticeable problem with older model LCDs. It’s a term that describes how certain bright parts of a movie would “hang around” for a few seconds, or even display a trail as it moved across the screen. This is due to brighter pixels that would ‘maintain’ light for a time period of 20 milliseconds, while undergoing the transition to another color or light intensity for another 15-20 milliseconds of time. Since the inception of LCD televisions, that time was shortened to only 8 milliseconds.
In order to improve the quality of LCD televisions going forward, a viable strategy is to increase the refresh rate (the ‘invisible’ line that scrolls and refreshes the screen constantly), and to reduce the backlight response of the LCD screen itself.
Interlaced vs. Progressive LCD HDTVs
Another factor in LCD HDTVs are the scan rate: which include an interlaced and a progressive picture. Have you ever seen video tape footage of a PC screen? If so, you may have noticed how the screen seems to “sweep” up and down constantly, almost like a slide show. That is an interlaced picture. Similarly, interlaced HDTVs (and monitors) refresh every other line of the picture, every other time. The process is unseen by the naked eye. However, interlaced screens are known to cause “eye distress,” which your mother warned you about when you sat too close to the TV set. Progressive sets, on the other hand, refresh every line every single time, much like one long “sweep” down the screen after another. Progressive pictures are easier on the eyes, display a smooth viewing image with less “jaggies,” and consequentially, cost a little more.
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