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Quattron is the brand name of an
LCD A liquid-crystal display (LCD) is a flat-panel display or other electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not em ...
color display technology produced by
Sharp Electronics is a Japanese electronics company. It is headquartered in Sakai, Osaka, and was founded by Tokuji Hayakawa in 1912 in Honjo, Tokyo, and established as the Hayakawa Metal Works Institute in Abeno-ku, Osaka, in 1924. Since 2016, it is majority ...
. In addition to the standard
RGB The RGB color model is an additive color model in which the red, green, and blue primary colors of light are added together in various ways to reproduce a broad array of colors. The name of the model comes from the initials of the three ...
(red, green, and blue) color
subpixels In digital imaging, a pixel (abbreviated px), pel, or picture element is the smallest addressable element in a raster image, or the smallest addressable element in a dot matrix display device. In most digital display devices, pixels are the sma ...
, the technology utilizes a
yellow Yellow is the color between green and orange on the spectrum of light. It is evoked by light with a dominant wavelength of roughly 575585 nm. It is a primary color in subtractive color systems, used in painting or color printing. In t ...
fourth color subpixel (RGBY) which Sharp claims increases the range of displayable colors, and which may mimic more closely the way the brain processes color information. The screen is a form of multi-primary color display, other forms of which have been developed in parallel to Sharp's version. The technology is used in Sharp's
Aquos The Sharp Aquos is a product brand name for LCD televisions, component screens, tablets and smartphones, originally sold by Sharp Corporation of Japan and also used by licensees. History It encompasses small, portable models (e.g. the 13" ...
LCD TV product line, particularly in models with screens 40 inches across and larger. It was at first introduced as “sub-pixel color technology” and then later coined into Quattron technology by Linda Lim from Sharp Malaysia. The technology, distinct from the product line, has been advertised featuring
George Takei George Takei ( ; born April20, 1937), born , is an American actor, author and activist known for his role as Hikaru Sulu, helmsman of the USS ''Enterprise'' in the ''Star Trek'' franchise. Takei was born to Japanese-American parents, with w ...
as the spokesperson in the debut commercial, in which he uses his
catchphrase A catchphrase (alternatively spelled catch phrase) is a phrase or expression recognized by its repeated utterance. Such phrases often originate in popular culture and in the arts, and typically spread through word of mouth and a variety of mass ...
"Oh My". Another commercial had Takei advertising the 3-D model with the Minions from the 2010 movie ''
Despicable Me ''Despicable Me'' is an American media franchise created by Sergio Pablos, Cinco Paul and Ken Daurio. It centers on a supervillain turned secret agent named Gru, his adoptive daughters, Margo, Edith, and Agnes, and his yellow-colored Minions ...
''. In Malaysia, the famous tagline was “4C has arrived, 3C is over” mimicking the attention of 4G technology trend at that moment, but was actually referring to its advanced color technology. The later version was known as Quattron Pro with further subdivided pixels applied to its HDTV range.


Reception


Analysis

According to an analysis by Raymond Soneira, president of DisplayMate Technologies, a video calibration equipment producer, the industry-standard color spaces used by content providers mean there is no existing source material that contains the fourth color channel. He therefore concludes that any "extra" colors displayed must be created in the television itself through video processing, resulting in exaggerated, less accurate color. Color researchers at
Queen Mary University of London Queen Mary University of London (QMUL, or informally QM, and formerly Queen Mary and Westfield College) is a public university, public research university in Mile End, East London, England. It is a member institution of the federal University ...
investigated the Quattron technology and found that although Quattron does have four physical color sub-pixels, it does not have a fourth primary in the backlight to drive it (yellow is approximately 575 nm). In other words, Quattron has a yellow sub-pixel to let light through, but the manufacturer has not made any provision to produce the yellow light needed to pass through it. (The yellow subpixel merely lets through more red and green light.) On that basis they conclude that it serves no useful function.


See also

*
Color depth Color depth, also known as bit depth, is either the number of bits used to indicate the color of a single pixel, or the number of bits used for each color component of a single pixel. When referring to a pixel, the concept can be defined as bit ...
*
Gamut In color reproduction and colorimetry, a gamut, or color gamut , is a convex set containing the colors that can be accurately represented, i.e. reproduced by an output device (e.g. printer or display) or measured by an input device (e.g. cam ...
*
Opponent process The opponent process is a color theory that states that the human visual system interprets information about color by processing signals from photoreceptor cells in an antagonistic manner. The opponent-process theory suggests that there are thre ...
, a color theory which considers yellow a primary color in addition to the classic RGB color model * PenTile matrix family (RGB reproduction via alternated RG/BG, RG/BW, etc.) *
RGBE filter In digital photography, the RGBE filter is an alternative color filter array to the Bayer filter (GRGB). It similarly uses a mosaic of pixel filters, of red, green, blue and "emerald" ("like cyan" according to Sony), and so also requires demosaici ...
– a Bayer filter with "emerald" as a 4th color *
Hexachrome Hexachrome is a discontinued six-color printing process designed by Pantone. In addition to custom CMYK inks, Hexachrome uses orange and green inks to expand the color gamut for better color reproduction. It is therefore also known as a CMYKOG pro ...
, a system for printing with six colours *
Tetrachromacy Tetrachromacy (from Ancient Greek ''tetra'', meaning "four" and ''chroma'', meaning "color") is the condition of possessing four independent channels for conveying color information, or possessing four types of cone cell in the eye. Organisms ...
, a different biological system from trichromacy, possibly found in some people *
Trichromacy Trichromacy or trichromatism is the possession of three independent channels for conveying color information, derived from the three different types of cone cells in the eye. Organisms with trichromacy are called trichromats. The normal expl ...
, scientific description of the RGB model for human vision


References


External links


Aquos LCD TV (Sharp website)
– ''Technical assessment of Quattron TV by David Mackenzie at HDTVtest'' {{Color topics LCD brand names Color depths Color space Consumer electronics brands Sharp Corporation televisions and displays