LCD TV : What is it?
| Liquid crystal display (LCD) televisions produce images using liquid crystal gels. The crystals are placed between two thin panels containing a grid of wires, which divide the gel into individual pixels that can be controlled individually. To produce an image, a current is passed through the grid, causing each pixel to brighten or darken according to the amount of voltage applied. A higher voltage produces a darker pixel, while low voltage creates a lighter shade. This system allows for more compact sets compared to cathode ray tube (CRT) systems. However, it also prevents total blockage of light, so blacks are actually displayed as dark gray in LCD screens. |
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Kinds of LCD TVs include the following: |
LCD-HDTVs
- LCD-HDTVs are designed to display high-definition (HD) signals, which have much higher resolutions than standard digital TV.
- They usually come with a digital signal tuner, allowing them to pick up signals from over-the-air without using a separate antenna.
- They usually require a subscription to a digital TV provider to access all available channels.
LCD-TVs
- LCD-TVs display both analog and digital signals, including standard formats such as PAL and NTSC.
- Some models are labeled HD-Ready, which means that they have HD capabilities but do not have the receiver required to pick up HD signals.
- They are commonly used with a separate tuner or set-top box, or integrated with a media center PC.
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Screen size: Consider the size of your room and available viewing distance when choosing an LCD TV. A 20- to 27-inch screen is best viewed from up to five feet away, making them ideal for small rooms. Screens measuring 32 to 37 inches need six to eight feet of distance, while 42- to 46-inch sets need 10 t 14 feet. For home theaters, choose a screen size of 50 inches or more.
Brightness: Choose an LCD TV that is bright enough to illuminate the entire screen. This is usually measured in candelas per square meter (cd/m²), or nits. Most models range from 450 to 800 nits. Larger screens need more brightness for even light distribution.
Pixel pitch: This refers to the distance between pixels of the same color on the screen. Choose an LCD TV with a pixel pitch of 0.4 mm or smaller for sharper images and brighter color.
Response time: Look for an LCD TV with a response time of 25 milliseconds (ms) or lower. This allows smoother movement of elements on the screen, especially in fast-action images such as races and video games.
Contrast Ratio: Choose an LCD TV with a high contrast ratio for deeper blacks and a wider range of colors. LCD screens generally have lower contrast ratios compared to CRT and DLP sets, but a ratio of about 800:1 will produce excellent image quality. |
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