LED TV Vs LCD TV

There are some differences that should be noted in the issue of LED TV vs. LCD TV. For starters, a traditional LCD television was created to use florescent lighting or another form of flat lighting while an LED TV will make use of a diode that emits light through an LCD panel. Furthermore, there are a number of different lighting styles within both LED and LCD TVs. For instance, some models contain an LED light panel located behind the LCD panel. In other models, LED lights are found around the outer rim of the screen. While in other models LED lights are tricolored and can be controlled in a way that will allow the picture to have stronger contrasts with blacks and bright colors. This feature is known as local dimming which is ultimately what makes the LED TV so different from traditional LCD television.

Picture Differences between LED TV Vs LCD TV

When a traditional LCD television is in operation, the backlight is always on. LCD televisions create dark areas in contrast by twisting crystals to a closed position to block light. This method provides fewer details in dark areas of the screen by offering a small contrast ratio. The local dimming of LED technology will correct the lower quality dark areas in LCD television. Since the LED diodes that control the lights in this technology are capable of being dimmed rather than blocked, higher details in darker areas of the picture are created. Therefore, LED TV Vs. LCD TV will find a greater advantage in the local dimming possibility of LED technology, simply for the higher contrast providing a detailed picture, and displaying more realistic color.

Life of LED and LCD TV

Another consideration in the LED TV Vs. LCD TV issue is the lifetime of the two television technologies. Many manufacturers will claim that their model will produce roughly 100,000 hours of life. However, since LED is still fairly new there is little data that states the length of the lifecycle of this television. Also model, manufacturer, and type of LED technology can play an important part in determining lifespan. It is true to say that since LED TV technology displays a better picture, there are a larger number of LCD TVs with this technology being produced than traditional LCD television. As this continues it is safe to say that the lifespan of an LED TV will become increasingly longer as it’s popularity continues grows.

Differences in Power Consumption of LED and LCD

In LED TV Vs. LCD TV is important to mention that the LED diodes used in local dimming will consume more power than traditional LCD televisions of the same size. In fact, the local dimming LED technology uses almost as much power as a plasma television. However, although the traditional LCD TV uses less power than the local dimming LED TV technology, it is also true to say that the white edge lit LED technology (LED lights located around the edge of the screen) uses less power than both LCD TV, and local dimming LED TV.

LED Television Technology

What is LED Backlight TV?

LED (Light Emitting Diode) TVs are basically LCD TVs that use a LED backlight system to illuminate the LCD screen. There are two methods to accomplish this:

1) LED edge lighting (Edge lit): In this method, LED lights are placed around the perimeter (sides) only. This allows for a slimmer TV design.

2) LED Backlight (Array lit): In this method, LED lights are placed in the form of an array (across the whole back of the display). Any of the lights can be turned off to correspond with the scene being displayed, and this is why it can project such an accurate picture.

What makes LED TVs better than traditional LCD TVs?

The advantages include:

Superior picture quality

LED TVs will produce deeper blacks due to “local dimming” technology. In comparison, LCD TVs produce a lower picture quality, especially when projecting dark backgrounds. The Cold Cathode Fluorescent Lamp (CCFL), which is located behind the screen, does not actually remain cool. Instead of using all of its energy to produce light, it wastes energy in the form of heat. Further, since the CCFL current flow must be kept at a high level to preserve its lifespan, LCD screens cannot be easily dimmed. This is one of the reasons why LED TVs can operate more efficiently while providing a more precise image quality.

Slim design

LED TVs have an ultra-thin design because of the LED backlight technology. This design makes it easy to mount your LED television on the wall to save space.

Power efficiency

LED TVs use less power than plasma and traditional LCD TVs. In fact, Samsung states that their TVs use 40% less power than a conventional TV. Switching to a LED TV will save you money on your monthly electrical bill and waste less energy on producing heat.

Eco-friendly

LED TVs are considered to be more environmentally friendly than fluorescent tubes because LED bulbs are mercury and lead free. LED TVs can also operate for longer hours (15 times longer than ordinary bulbs). The overall lifespan is much longer than your average TV.

Given that it is still relatively new and that it is a superior technology, LED TVs are a little more expensive than plasma and LCD TVs. Samsung, a leader in the TV industry, has a wide range of LED TVs that range from $1,600 – $3,200 depending on the size.

LCD Television Technology

Introduction to LCD Television

Like the popular flat panel LCD monitors that are now commonly used with computers, LCD Televisions have a slim design and a flat viewing surface, but have been fine tuned for video and television display. Recent advances in flat panel LCD television technology now allow for larger screens, wider viewing angles, and higher-quality video images. LCD Televisions are also competing with plasma television technology. They are several times lighter than comparably sized plasma televisions, and are far more durable.

All LCD Televisions offer progressive scan displays and sleek, slim designs. They also provide users with a bevy of input options, adding to their versatility. Most LDC televisions double as computer displays by allowing standard analog VGA (PC) or even DVI digital input, a great option if you need your LCD Television to pull double duty as a PC monitor. Nearly all LCD Television sets offer the option to mount on a wall, under a cabinet, on on a desktop.

How LCD Televisions Work

An LCD Television is sometimes referred to as a "transmissive" display—light isn't created by the liquid crystals themselves; a light source behind the panel shines light through the LCD Television display. A white diffusion panel behind the LCD redirects and scatters the light evenly to ensure a uniform image.

The LCD television display consists of two polarizing transparent panels and a liquid crystal solution sandwiched in between. The screen's front layer of glass is etched on the inside surface in a grid pattern to form a template for the layer of liquid crystals. Liquid crystals are rod-shaped molecules that bend light in response to an electric current — the crystals align so that light cannot pass through them. Each crystal acts like a shutter, either allowing light to pass through or blocking the light. The pattern of transparent and dark crystals forms the image. It's the same display technology behind your digital watch but way more sophisticated.

LCD Televisions typically use the most advanced type of LCD, known as an "active-matrix" LCD. This design is based on thin film transistors (TFT) — basically, tiny switching transistors and capacitors that are arranged in a matrix on a glass substrate. Their job is to rapidly switch the LCD's pixels on and off. In an LCD Television, each color pixel is created by three sub-pixels with red, green and blue color filters.

One of the biggest challenges for LCD television manufacturers has been speeding up the "pixel response" time (how fast an individual pixel's color can change without blurring) to ensure that fast-moving objects don't exhibit "motion lag" or ghosting. It's especially critical for larger-screen LCD Televisions where much of the viewing will be DVD movies and/or HDTV.

An important difference between plasma and LCD television technology is that an LCD television screen doesn't have a coating of phosphor dots (colors are created through the use of filters). That means you'll never have to worry about image burn-in, which is great news, especially for anyone planning to connect a PC or video game system. LCD televisions are extremely energy-efficient, typically consuming 60% less power than comparably-sized tube-type direct-view TVs.

Shortcut to create table in MS Word

To create a table in Ms Word you can use this shortcut.

1. Just type : +======+=====+====+===+==+=+

2. And simply hit 'Enter'.

3. You will see that the text changes to a table. Here, the number '=' represent the number of characters in each cell.

4. Just it makes your work easy and fast.

GPRS and EDGE Multislot Classes

The upload and download speeds that can be reached with a GPRS and EDGE mobile phones depends on a number of factors. First, the capacity available in the cell. Usually, voice calls take precedence over GPRS traffic and in case not enough time slots are available for both, some GPRS timeslots are sacrificed for voice calls. Second, the capability of the mobile, or it's multislot class. Third, the network has to match the abilities of the mobile device. And fourth, the reception conditions experienced by the mobile.

The most comment GPRS/EDGE mobile station class today seems to be multislot class 10. Mobiles of this class can use 4 timeslots in downlink direction and 2 timeslots in uplink direction with a maximum number of 5 simultaneous timeslots. Depending on the amount of data to be transfered in the uplink the network will automatically configure the ongoing data stream for either 3+2 or 4+1 operation.

Some high end mobile, usually also supporting UMTS also support GPRS/EDGE multislot class 32. According to 3GPP TS 45.002 (Release 6), Table B.2, mobile stations of this class support 5 timeslots in downlink and 3 timeslots in uplink with a maximum number of 6 simultaneously used timeslots. If data traffic is concentrated in downlink direction the network will configure the connection for 5+1 operation. When more data is transferred in the uplink the network can at any time change the constellation to 4+2 or 3+3. Under the best reception conditions, i.e. when the best EDGE modulation and coding scheme can be used, 5 timeslots can carry a bandwidth of 5*59.2 kbit/s = 296 kbit/s. In uplink direction, 3 timeslots can carry a bandwidth of 3*59.2 kbit/s = 177.6 kbit/s.

While the numbers are quite impressive it should not be forgotten that a single carrier has 8 timeslots of which two are reserved for signaling on the first carrier. Using 6 timeslots for a single mobile means almost the complete carrier is used for the data transfer of a single mobile. Under realistic conditions it's unlikely a cell has that much free capacity to offer next to voice calls.