Difference between TFT and Plasma

Key Difference: TFT (Thin-film transistor) is a type of semiconductor that is used in liquid crystal display (LCD) panels, while plasma displays are developed using noble gases that are electrically heated to produce light. Plasmas are a better choice in producing displays greater than 40 inches, TFT LCDs become more expensive to produce. TFT displays are also thinner, lighter and consume less power compared to Plasmas. Plasmas are also susceptible to burn-ins, where an image that is constantly displayed can be burned on the screen permanently.

TFT (Thin-film transistor) is a type of semiconductor that is used in liquid crystal display (LCD) panels, while plasma displays are developed using noble gases that are electrically heated to produce light. Most TVs today use either one of these technologies.

TFT (Thin-film transistor) is a field-effect transistor that is used to build the LCD screen. A TFT is created by depositing thin films of a semiconductor active layer as well as the dielectric layer and metallic contacts over a supporting substrate. Each pixel of a LCD receives a transistor that makes switching it on and off very easy. Also since the TFT are embedded within the panel itself, it reduces the crosstalk between pixels, like in plasma. Crosstalk is when a signal transmitted to one pixel also affects another pixel. A TFT is also known as an active matrix display technology, which is more responsive to change and has a faster refresh rate. The faster response rate also eliminated the problem faced by gamers.

Currently, TFTs have become the standard in producing LCD and LED screens. TFT uses four types of technologies:  Twisted Nematic + Film (TN Film), In-Plane Switching (IPS), Vertical Alignment (VA), and Plane to Line Switching (PLS). TN Film is the most common of these due to low production costs, but comes with certain drawbacks such as poor depth quality and restrictive viewing angles. TN Film panels provide fast refresh rates and are based around a 6-bit color depth along with a Frame Rate Control (FRC). IPS dubbed as the ‘super TFT’ was created to remove the drawbacks of TN Film. While it improved viewing angles, it provided poor response times, contrast ratios and was expensive to produce. VA displays were originally poor in response times, but offer 8-bit color depth and a great static contrast ratio. PLS is a new display technology created by Samsung in 2011 and offers improved viewing angles, low production costs, better image quality and increased brightness.

Plasmas are more common in displays greater than 40 inches. A plasma panel has tiny cells of noble gases (neon and xenon) and a small amount of mercury in compartmentalized spaces between two glass panels. The panels also have two electrodes between the glass panels, an address electrode and the display electrodes. The display electrodes are surrounded by an insulating dielectric material and covered by a magnesium oxide protective layer. In order to create the pixels, the address electrode and the display electrodes are charged, which then releases an electric current that flows through the cell. The charge stimulates the gas atoms in the cells to release ultraviolet photons. The photons interact with the phosphor material on the cell walls and give off light, creating a visible light photon. Each pixel has three subpixels, one coated with red, one with blue and one with green. By manipulating the intensity of the current, the system can produce hundreds of different combinations of the three colors and creates an image on the screen.

Both technologies have various advantages and disadvantages. While, Plasmas are a better choice in producing displays greater than 40 inches, TFT LCDs become more expensive to produce. TFT displays are also thinner, lighter and consume less power compared to Plasmas. Plasmas are also susceptible to burn-ins, where an image that is constantly displayed can be burned on the screen permanently.

 

TFT

Plasma

Thickness

Minimum 1 inch

Minimum 3 inches

Power consumption

Consumes less power compared to Plasma

Consumes more power compared to TFT LCD

Screen Refresh Rate

60Hz recommended; 75Hz; faster compared to plasma

Slower compared to TFT LCD

Screen size

13-57 inches

40 inches and above

Screen glare

Less glare

More glare

Running Temperature

Cooler than plasma

Hot

Burn-in

No burn-in occurs; but burn-outs can occur

Can occur if picture left on too long

Viewing angle

178 degrees

Up to 160 degrees

Contrast Ratio

1000 :1 to 1200:1

3000:1

Life span

60,000 hours

Modern plasmas have the same as LCD; 60,000 hours

Weight

Weights less than Plasma

Weights more than TFT LCD

Benefits

Small size, light weight, consumes less energy, sharper display

Excellent contrast and black levels; effortless motion; good picture depth; Less visible motion blur; fast refresh rate;

Limitations

Fixed native resolution, issues with color rendition, issues in viewing angle

Not as power-efficient or thin as most LCDs; generates more heat than LCDs; susceptible to burn in and image retention; does not work well in high-altitudes

Image Courtesy: ercservice.com, ddmcdn.com

Most Searched in Beauty and Style Most Searched in Games and Recreation
Most Searched in Food and Drink Most Searched in Education and References
Lord vs God
Fleas vs Lice
Productivity vs Production
Heart Attack vs Heartburn

Add new comment

Plain text

CAPTCHA
This question is for testing whether or not you are a human visitor and to prevent automated spam submissions.