breakthroughs in TV technology which have changed the way we watch
From HD to 3D via Plasma and LED, discover 10 key innovations in television technology from the last few decades.
Britain is a nation of telly addicts. And why not? TV’s a great way to relax, catch up on world events and keep us entertained.
According to Ofcom, 90% of us watch TV each week, and one in four adults say a television is the device they would miss the most.
Over the last 10 years the TV industry has change dramatically. Technological developments have ushered in a multi-channel era, with better picture quality and more choice about what we watch and when we watch it.
Here are 10 breakthroughs in modern TV technology.
1. CRT
If you bought a television between the late 1960s and the 2000s it was probably a cathode ray tube (CRT) set.
Each CRT set has a vacuum tube with electron guns that beam red, green and blue electrons onto a phosphor screen. The rays scan the dark screen, building up thousands of red green or blue dots to create picture.
The technology dominated for three quarters of a century - CRT TVs date back to the 1930s and it was only in 2007 that sales of the slimmer, more versatile LCD units overtook sales of CRT sets.
2. LCD vs Plasma
Flat screen sets started to appear in the late 1990s. Their immediate advantage over CRT was space. They were also lighter, so could be mounted on a wall and came in bigger screen sizes.
But the choice between CRT and flat screen wasn’t straightforward - in the early 2000s you had the choice of two flat-panel technologies: LCD or Plasma.
LCD panels have a backlight made from CCFL lamps, which shine through a polarising filter and a matrix of colour liquid coloured crystal cells. Each cell lets in a different amount of colour creating a picture.
Plasma screens were comprised of thousands of cells between glass panels. Each of the cells (or pixels) holds a gas and when an electrical charge passes through a reaction occurs and red, green or blue light is emitted depending on the current.
Plasma sets had superior black levels, contrast, better viewing angles and high refresh rates (which means less blur with fast moving action). However they were less energy efficient than LCD, and as the price of LCD sets dropped they were eventually overtaken in popularity by LCD and LED technology. In 2014 Panasonic and other manufacturers discontinued plasma sets.
3. Digital television
By : Hannah Bouckley
From : http://home.bt.com
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