Are you going to buy an LCD TV? Then please stop by and check these specifications before buying one. There are several important factors in LCD TV's like response time, contrast, aspect ratio, viewing angle, colours, etc. You have to understand certain basic things like LCD TV has Twisted Nematic (TN) liquid crystals that actually controls the amount of light falling on the screen (or matrix). A liquid crystal display consists of an array of tiny segments-called "pixels"-that are manipulated to form images or to present information. Addressing is the process by which pixels are turned on (which disables the passage of light) and off (which enables the passage of light) so as to create an image on the polarized display pane in front of you. So-called active-matrix LCD TVs employ thin film transistors (TFTs), or tiny switching transistors and capacitors arranged in a matrix on a glass substrate, to direct electric charges down columns to reach a particular pixel. The colour can be actually reproduced by dividing each pixel into sub pixels of basic color units namely Red, Green and Blue. The combination of these three will produce all the colors. Let us see the characteristics one by one:
Response time:
Technically, it can be defined as the time taken to switch the liquid crystal ON or OFF. In other words, Motion lag in LCDs is the slight trailing sensation that is visible when fast motion scenes are displayed on an LCD. It appears as if the picture is unable to cope up with the changes in the original feed. This is the most important parameter for you, if you are going to buy LCD TV for ultimate gaming and movie experience. Depending upon the manufacturer the response time varies. There are response times as low as 2.5ms but thorough inspection is needed before deciding your brand.
Contrast Ratio:
You might have noticed in the specification of an LCD TV things such as 10000:1 or 1000:1, etc. These are nothing but the contrast ratio. It gives the number of shades of grey in between the darkest black and the brightest white in your LCD screen. It is really good to have high contrast ratio. They have achieved ratios upto 100000:1. It is usually measured at the manufacturing site itself. There is no particular standard to determine this value. It is generally obtained by the following method. To know the value of darkest black, your TV is simply switched off as this gives the active matrix a pure black colour. The white colour can be obtained by selectively illuminating a particular area in the screen. This is done with the help of activating only that particular crystals. Usually this will also vary from one manufacturer to another.
I'll discuss about the other characteristics in my next post...
Response time:
Technically, it can be defined as the time taken to switch the liquid crystal ON or OFF. In other words, Motion lag in LCDs is the slight trailing sensation that is visible when fast motion scenes are displayed on an LCD. It appears as if the picture is unable to cope up with the changes in the original feed. This is the most important parameter for you, if you are going to buy LCD TV for ultimate gaming and movie experience. Depending upon the manufacturer the response time varies. There are response times as low as 2.5ms but thorough inspection is needed before deciding your brand.
Contrast Ratio:
You might have noticed in the specification of an LCD TV things such as 10000:1 or 1000:1, etc. These are nothing but the contrast ratio. It gives the number of shades of grey in between the darkest black and the brightest white in your LCD screen. It is really good to have high contrast ratio. They have achieved ratios upto 100000:1. It is usually measured at the manufacturing site itself. There is no particular standard to determine this value. It is generally obtained by the following method. To know the value of darkest black, your TV is simply switched off as this gives the active matrix a pure black colour. The white colour can be obtained by selectively illuminating a particular area in the screen. This is done with the help of activating only that particular crystals. Usually this will also vary from one manufacturer to another.
I'll discuss about the other characteristics in my next post...
1 comments:
Thanks for the info machi.. Will lookout for these spec when i buy
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