LCD Versus Plasma & LED

Plasma and LCD displays work in two very different ways. A plasma TV is sometimes called an "emissive" display while an LCD panel has a “Tran missive” display. Let’s explore the differences in these two technologies

How a Plasma TV works

A plasma display consists of two transparent glass panels with a thin layer of pixels sandwiched in between. Each pixel is composed of three gas-filled cells or sub-pixels (one each for red, green and blue). A grid of tiny electrodes applies an electric current to the individual cells, causing the neon and xenon gas in the cells to ionize. This ionized gas (plasma) emits high-frequency UV rays, which stimulate the cells' phosphors, to glow the desired colour.

Because a plasma panel is illuminated at the sub-pixel level, images are extremely accurate, and the panel's light output is both high and consistent across the entire screen area. Plasma TVs also provide very wide horizontal and vertical viewing angles. Picture quality looks sharp and bright from virtually anywhere in the room.

Most flat-panel TVs are progressive displays – they draw the entire image at once. Panasonic’s 1080p plasma displays illuminate over two million pixels for true high-definition clarity, deeper blacks and warmer colours.

How an LCD TV works

Light in an LCD (Liquid Crystal Display) panel isn't created by the liquid crystals themselves; instead, a light source behind the panel shines light through the display, while a white diffusion panel behind the LCD redirects and scatters the light evenly to ensure a uniform image.

The 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. This pattern of transparent and dark crystals forms the image.

LCD TVs use the most advanced type of LCD, known as an "active-matrix" LCD. This design is based on thin film transistors (TFT). Their job is to rapidly switch the LCD's pixels on and off. In a colour LCD TV, each colour pixel is created by three sub-pixels with red, green and blue colour filters.

An important difference between plasma and LCD technology is that an LCD screen doesn't have a coating of phosphor dots (colours 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 TVs are extremely energy-efficient, typically consuming 60% less power than comparably-sized tube-type TVs.

Which television is right for you?

Plasma TVs have been around longer than LCD TVs and their technology is a little further along. Plasma screens use a phosphor coating like tube TVs, so they have the natural colour we're used to with tube models. People often describe plasma's picture quality as richer or more "cinematic." It's a great choice for a home theatre, or main TV.

A plasma TV might be for you if:

•   You want really rich, warm colours and deep blacks
•   You like to watch sports and other fast-action TV
•   You'll be sitting off-axis when you watch TV or movies
•   Your viewing room doesn't have a lot of ambient light, or you can easily reduce the light by closing blinds.

A flat-panel LCD TV might be for you if:

• You watch a lot of TV shows or play lots of video games with static images on the screen for extended    periods of time, multiple days a week
• Your TV room is relatively bright, or you do a lot of daytime viewing.

LCD and Plasma

Plasma TVs are self-illuminating and provide wide viewing angles. Black areas do not fade, and colours remain almost identical regardless of where the viewer is positioned.

LED Televisions

LED TVs are a new range of flat screen panel televisions that are dedicated to slimness and light weight portability.  LED TVs use a crisp sharp LED light to illuminate the picture.  Due to their new technology they are by comparison not as popular as the Plasma and LCD range which still dominate the market.