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The Evolution of Television Technology – Part VIII Modern Television Technologies – LCD TV & LED TV
Article by Gary Davis
“We’ve gone through an evolution of technologies. The capabilities our technology can provide are now what the industry is demanding.” – Bill Jones, Politician (Ex- California Secretary of State)
The 20th century has witnessed tremendous technological changes happening at a fast pace. The world is in a constant flux of accelerating change, the rate of progress is happening exponentially, giving us frequent surprises at closer intervals of time, and leaving us amazed. Gordon E. Moore and Ray Kurzweil’s law’s of technological progress reinforce the rapid development fact, giving us an idea that the future of television is going to be very different, and this drastic change in television technology is going to come sooner than expected.
The LCD Tide
Plasma TV was the undoubted leader in flat panel displays since 1997, as it was available in large sizes, was better in brightness and response time, had greater color spectrum, and its viewing angle was wider than the Liquid Crystal Display (LCD) screens, also available at that time. In 2010, Panasonic attempted to display the supremacy of Plasma by exhibiting 152-inch 2160p 3D plasma, standing more than 6ft by 11 ft in size. However, LCD TV displaced Plasma Display TV in 2007, as the most selling television, even surpassing the sale of CRT TVs.
Working of LCD
The Liquid Crystal Display (LCD) technology is based on the liquid crystals made up of complicated molecules, whose double melting point property helps to change its appearance from transparent to opaque. These liquid crystals are kept between two special borosilicate glass panels, or good quality plastic panels, covered with electrodes in rows and columns, such that each liquid crystal connects to each electrode. The crystals are activated by electric current, and can be turned off and on individually to let the light coming from its back pass through, get blocked, or make the crystal turn or twist, thus creating dark or light pixels on the reflecting screen.
History of LCD
The LCD story began with the discovery of liquid crystals in 1888 by the Austrian botanist Friedrich Reinitzer, and after contributions by many scientists, The Marconi Wireless Telegraph Company in 1936 practically applied the technology for the first time in the form of the liquid crystal light valve. It was the American engineer George H. Heilmeier who developed the works of Richard Williams, working at the RCA labs, and invented the LCD in 1964. Wolfgang Helfrich and Martin Schadt developed the LCD to work as a wristwatch display, which went into production from the 1970s. The present LCD TVs use the active-matrix LCD (AMLCD) panel that was first made by T. Peter Brody in 1972.
The LCD was used in instrument and equipment display screens and faced tough competition from the plasma displays during the 1970s and 80s, but LCD emerged the winner due to its light weight and low cost, and so was the case when it was used for portable computer monitor screens in the 1980s. Lower screen refresh rates of LCD limited its use for only smaller televisions, the first of which, a 14-inch LCD TV, was created by Japan’s Sharp Corporation in 1988. Gradually with the enhancement of technology, LCD TV started to increase its hold from the small size TVs segment to medium 32-inch displays by 2004, and 42-inch LCD TV by 2006. It started offering higher resolution with true 1080p and HD support, keeping its price competitively lower than the plasma TVs, ending the latter’s dominance in the 40-inch and above category. Its global manufacturing and demand increased its sales to overtake rear-project systems, CRTs, and eventually plasma screens, in 2007.
The Good and Bad of LCD TV
LCD screens could be manufactured from a mini size of 3-inch to a behemoth of 108-inch, supporting resolution even greater than the standard high definition (HD) and manufactured by companies like LG, Samsung, Sharp Corporation and Sony. Even though LCD was the solution for the size and aspect ratio, the limitations of CRT like weight, cost, and screen burn-in problems of Plasma TV; it had its own disadvantages like the blurring of motion images, restrictive viewing angles, high consumption of power, and harmful environmental effects due to the use of the greenhouse nitrogen trifluoride gas.
Advantage LED TV
One reason for the LCDs low contrast ratio is that the screens have to be backlit for which cold cathode fluorescent lamps (CCFLs) are used, and to improve this shortcoming some companies use high-power Light Emitting Diodes (LEDs) instead, which create greater dynamic contrast, offer wider color gamut, consume less power, and such TV’s are called LED TV.
In 2004, Sony came up with its Qualia 005, distinguished as the first consumer LED backlit LCD TV, or simply LED TV. Others that followed were the Sony BRAVIA series, especially the 40-inch sized and 9.9mm thin SONY BRAVIA KLV-40ZX1M in 2008, which offers Edge-LED TV technology. Another form is the Thin Film Transistor-Liquid Crystal Display (TFT-LCD), which uses active matrix and is mostly used in computer monitors, mobile phones, and televisions.
Late 20th century has had a range of flat display panels that overpowered the CRT TVs, first by plasma TV, later by LCD and LED TV. There is a whole range of next generation television display technologies that will soon transform today’s exceptional TV into tomorrow’s extinct TV, as such is going to be the pace of future television technology.
Samsung UN19D4003 19-Inch 720p 60Hz LED HDTV (Black)
LCD TV – click on the image below for more information.
- 720p Resolution,Internet ready
- 1 USB (JPEG/MP3)
- 60Hz,un19D4003
LCD TV
The Samsung UN19D4003 19″ Class Widescreen LED HDTV delivers 1366 x 768 resolution that allows you to view images in perfect detail. Enjoy HD quality videos with the 16:9 widescreen aspect ratio. Captivate your senses with its 20,000:1 dynamic contrast ratio, bringing more depth to every image with its ability to produce rich color levels. It comes with two HDMI inputs to support the delivery of audio and video signals with just a single cable. View photos and play music from your favorite devic
Samsung UN19D4003 19-Inch 720p 60Hz LED HDTV (Black)
Click on the button for more LCD TV information and reviews.
LCD TV question by out_for_quest: Can a LCD TV Stay in a suitecase with the screen facing down?
I want to take my 19inch LCD TV in my suitecase and check the suitecase in the plane. My question is, is there any harm to the TV for keeping it in a suitecase such that its screen faces down?
LCD TV best answer:
Answer by Gadget
It don’t matter which way up the screen is so long as it isn’t going to get broken, remember it’s make with a very thin piece of glass unlike a normal TV where it’s about 1″ thick