This article is from bestLCDdeal.com which is online retailers in Hyderabad.
LCD TV Response
One of the specifications you’ll see(or will not see) when researching a new LCD TV flat screen
purchase is response time. This important spec represents the amount of time it takes for one pixel to go from active(black) to inactive(white) and back to black again. Think of it in relation to
shutter speed on a camera. It’s the speed at which an LCD panels crystals twist" to block and allow light to pass. It is measured in milliseconds(ms) with a lower number meaning faster change between active and inactive pixels and resulting in less image artifacts. The lower the response time the better.
Refresh rates:
120Hz/240Hz/480Hz - These are releated to the screen refresh rates of LCD televisions. Standard LCDs are 60Hz, they redraw the screen 60 times per second. These double and redouble the speed in an effort to combat motion blur and judder. Sometimes this is accomplished by manipulating the backlight and are not "true" 120Hz. Manufacturers have come up with many names for this feature, Sony calls it MotionFlow, Sharp calls it AquoMotion, Samsung calls it AutoMotion Plus, LG calls it TruMotion but they are all just names for the higher refresh rates of their 120+ Hz models.
Contrast ratio:
Contrast ratio is simply the ratio between the brightest white measurement and the darkest black
Measurement. A recent example of the ratio is 10, 000:1 meaning there are 9, 998 shades of gray between the darkest black and the brightest white that the TV will produce.
Viewing angle:
Viewing angle refers to the off angle axis when moving away from 0 degrees on axis in front of a TV. The terms referring to viewing angle are important to understand because there is a frequent problem with many TVs picture quality decreasing due to a hazy effect caused by the screen of the TV itself.
HDTV Format:
To put the 720 or 1080 lines into perspective, televisions of the past had 480 lines. Since more
lines means a better picture then that alone shows why the HDTV has a nicer picture than an analog TVMore lines is nice but don’t forget about the’p’ and’i’ in the 720p, 1080i and 1080p. The letter is an abbreviation for the type of scan the TV uses -’p’ stands for progressive and’i’ stands for interlaced. Progressive scan is better than interlaced because it processes the images twice as fast. This faster scan rate produces better clarity and color in the on-screen picture. The difference between 720p and 1080i is minimal but the TV industry is using 720p more than 1080i. So, buying a 720p HDTV is recommended over a 1080i HDTV. As far as 1080p, there is no doubt that 1080p is the best resolution on the market. However, there is little to no difference in picture quality between a 1080p and 720p at the 32" and below screen size.
The right distance depends on the size of your TV:
For 20 to 27-inch displays, you should be able to watch comfortably from 2.5 to 5 feet away.
For 32 to 37-inch TVs, you should sit back 6 to 8 feet from the screen itself.
For 42 to 46-inch TVs, you’ll need 10 to 14 feet between you and the screen.
50-inch LCD displays look best when viewed from 12 to 16 feet away.