How good is LED TV
LED TVs are very good and long lasting. The many advantages of LED TV include light weight, bright flat TV screen and less electric power consumption. Thus LED TVs are an ideal TV for use in India. In this page we will explain about the important things to consider and what to look for when buying an LED TV in India
An LED TV is an LCD TV (Liquid Crystal Display TV) with LED (Light Emitting Diode) bulbs as its backlight. In a Flat Screen LED TV the picture is formed on an LCD screen which have millions of Liquid crystals sandwiched between two glass panels. This assembly is known as the LCD panel. The LCD panel is an electronic screen on which the picture is formed, but this screen does not produce any light of its own, and needs to have a bright light at the back to project the picture on to the TV screen.
Types and size of LED TVs
The types of LED TVs available are dependent on their screen resolutions. There is 'HD ready' LED TVs with 1280x720 pixels resolution; the 'Full HD' LED TVs with 1920x1080 pixels resolution and the latest 4K Ultra HD LED TVs with 3840x2160 pixels resolution.
LED TVs are available in various sizes, from about 19 inches right upto the largest production TVs in 2015 at 105 inches. The most common sizes of LED TVs being sold in India are the 32 inch, 40 inch and the 55 inch LED TVs.
LED TV specifications explained
Some of the LED TV specifications which are special to LED TVs are explained here
TV Contrast Ratio
The contrast ratio of a TV is defined as the light value at the brightest spot on a TV screen divided by the darkest spot on a TV screen. If there is no light at all on the darkest area of the TV screen, then the light value there will be 'zero'. Any value divided by 'zero' gives 'infinity'. So a TV which can have a completely dark area with no light at all, then that TV would have the highest contrast ratio.
Contrast Ratio of LED TVs
Unfortunately LED TVs suffer from NOT having the best contrast ratio. This is because the LED TV needs to have bright LED lights shining at the back of the LCD screen all the time to project the picture on to the flat TV screen. Since the backlight of the LED screen is shining over the whole screen, some of the light escapes through the LCD screen and shines on the dark areas of the screen. So LED TVs cannot have a completely dark screen and hence suffer from not having the highest contrast ratio among the different types of TVs.
Local Dimming in LED TVs
To improve the contrast ratio of LED TVs, the LED TV manufacturers have devised a way of filling the back of the LED TV with many lower powered LED bulbs. These LED bulbs are automatically controlled to light up behind bright parts of the TV image and to stay 'off' under the dark areas of the TV picture. This ingenious method of controlling the backlights in an LED TV is known as local dimming. With local dimming the contrast ratio of LED TVs can be improved dramatically, but this also means that the LED TV with local dimming feature will be more expensive.
IPS Screen in LED TVs
IPS stands for In Plane Switching. IPS LED TVs are now considered the top of the range in LED TVs. The LCD panel in an LED TV screen can be of two types: In-Plane Switching (IPS) or Twisted Nematic (TN) type. IPS is the superior technology because it gives much wider viewing angles and much better color to the TV screen.