A generic LCD TV, with speakers on either side of the screen
Liquid-crystal-display televisions (LCD TVs) are television sets that use liquid-crystal displays
to produce images. They are, by far, the most widely produced and sold
television display type. LCD TVs are thin and light, but have some
disadvantages compared to other display types such as high power
consumption, poorer contrast ratio, and inferior color gamut.
LCD TVs rose in popularity in the early years of the 21st century, surpassing sales of cathode ray tube televisions worldwide in 2007. Sales of CRT TVs dropped rapidly after that, as did sales of competing technologies such as plasma display panels and rear-projection television.
History
An LCD TV hanging on a wall in the Taipei World Trade Center during the Computex Taipei show in 2008.
Early efforts
Passive matrix
LCDs first became common as portable computer displays in the 1980s,
competing for market share with plasma displays. The LCDs had very slow
refresh rates that blurred the screen even with scrolling text, but
their light weight and low cost were major benefits. Screens using
reflective LCDs required no internal light source, making them
particularly well suited to laptop computers. Refresh rates of early
devices were too slow to be useful for television.
Portable televisions
were a target application for LCDs. LCDs consumed far less battery
power than even the miniature tubes used in portable televisions of the
era. In 1980, Hattori Seiko's R&D group began development on color LCD pocket televisions. In 1982, Seiko Epson
released the first LCD television, the Epson TV Watch, a small
wrist-worn active-matrix LCD television. Sharp Corporation introduced
the dot matrix TN-LCD in 1983, and Casio introduced its TV-10 portable TV. In 1984, Epson released the ET-10, the first full-color pocket LCD television. That same year Citizen Watch introduced the Citizen Pocket TV, a 2.7-inch color LCD TV, with the first commercial TFT LCD display.
Throughout this period, screen sizes over 30" were rare as these
formats would start to appear blocky at normal seating distances when
viewed on larger screens. LCD projection systems were generally limited
to situations where the image had to be viewed by a larger audience. At
the same time, plasma displays could easily offer the performance needed
to make a high quality display, but suffered from low brightness and
very high power consumption. Still, some experimentation with LCD
televisions took place during this period. In 1988, Sharp introduced a
14-inch active-matrix
full-color full-motion TFT-LCD. These were offered primarily as
high-end items, and were not aimed at the general market. This led to
Japan launching an LCD industry, which developed larger-size LCDs,
including TFT computer monitors and LCD televisions. Epson developed the 3LCD
projection technology in the 1980s, and licensed it for use in
projectors in 1988. Epson's VPJ-700, released in January 1989, was the
world's first compact, full-color LCD projector.
Market takeover
In
2006, LCD prices started to fall rapidly and their screen sizes
increased, although plasma televisions maintained a slight edge in
picture quality and a price advantage for sets at the critical 42" size
and larger. By late 2006, several vendors were offering 42" LCDs, albeit
at a premium price, encroaching upon plasma's only stronghold. More
decisively, LCDs offered higher resolutions and true 1080p support, while plasmas were stuck at 720p, which made up for the price difference.
Predictions that prices for LCDs would rapidly drop through 2007
led to a "wait and see" attitude in the market, and sales of all
large-screen televisions stagnated while customers watched to see if
this would happen. Plasmas and LCDs reached price parity in 2007, with the LCD's higher resolution being a 'winning point' for many sales. By late 2007, it was clear plasmas would lose out to LCDs during the critical Christmas sales season.
This was in spite of plasmas continuing to hold an image quality
advantage, but as the president of Chunghwa Picture Tubes noted after
shutting down their plasma production line, "(g)lobally, so many
companies, so many investments, so many people have been working in this
area, on this product. So they can improve so quickly."
When the sales figures for the 2007 Christmas season were finally
tallied, analysts were surprised to find that not only had LCD outsold
plasma, but CRTs as well, during the same period.
This development drove competing large-screen systems from the market
almost overnight. Plasma had overtaken rear-projection systems in 2005. The same was true for CRTs, which lasted only a few months longer; Sony ended sales of their famous Trinitron in most markets in 2007, and shut down the final plant in March 2008. The February 2009 announcement that Pioneer Electronics was ending production of the plasma screens was widely considered the tipping point in that technology's history as well.
LCD's dominance in the television market accelerated rapidly.
It was the only technology that could scale both up and down in size,
covering both the high-end market for large screens in the 40 to 50"
class, as well as customers looking to replace their existing smaller
CRT sets in the 14 to 30" range. Building across these wide scales
quickly pushed the prices down across the board.
In 2008, LCD TV shipments were up 33 percent year-on-year compared to 2007 to 105 million units.
In 2009, LCD TV shipments raised to 146 million units (69% from the total of 211 million TV shipments).
In 2010, LCD TV shipments reached 187.9 million units (from an estimated total of 247 million TV shipments).
Larger size displays continued to be released throughout the decade:
- In October 2004, Sharp announced the successful manufacture of a 65" panel.
- In March 2005, Samsung announced an 82" LCD panel.
- In August 2006, LG.Philips LCD announced a 100" LCD television
- In January 2007, Sharp displayed a 108" LCD panel under the AQUOS brand name at CES in Las Vegas.
Competing systems
In
spite of LCD's dominance of the television field, other technologies
continued to be developed to address its shortcomings. Whereas LCDs
produce an image by selectively blocking a backlight, organic LED, microLED, field-emission display and surface-conduction electron-emitter display
technologies all produce an illuminated image directly. In comparison
to LCDs all of these technologies offer better viewing angles, much
higher brightness and contrast ratio (as much as 5,000,000:1), and
better color saturation and accuracy. They also use less power, and in
theory they are less complex and less expensive to build.
Manufacturing these screens proved to be more difficult than
originally thought, however. Sony abandoned their field-emission display
project in March 2009,
but continued to work on OLED sets. Canon continued development of
their surface-conduction electron-emitter display technology, but
announced they would not attempt to introduce sets to market for the
foreseeable future.
Samsung announced that 14.1 and 31 inch OLED sets were "production ready" at the SID 2009 trade show in San Antonio.
