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Plasma display
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Type of flat panel display
A plasma display panel (PDP) is a type of flat panel display that uses
small cells containing plasma: ionized gas that responds to electric
fields. Plasma televisions were the first large (over 32 inches
diagonal) flat panel displays to be released to the public.
Panasonic plasma TV of the last generation. 55 inch. Middle class ST60
series. (2013)
Until about 2007, plasma displays were commonly used in large
televisions (30 inches (76 cm) and larger). By 2013, they had lost
nearly all market share due to competition from low-cost LCDs and more
expensive but high-contrast OLED flat-panel displays. Manufacturing of
plasma displays for the United States retail market ended in
2014,^[1]^[2] and manufacturing for the Chinese market ended in
2016.^[3]^[4] Plasma displays are obsolete, having been superseded in
most if not all aspects by OLED displays.^[5]
[ ]
Contents
* 1 General characteristics
* 2 Plasma display advantages and disadvantages
+ 2.1 Advantages
+ 2.2 Disadvantages
* 3 Native plasma television resolutions
+ 3.1 Enhanced-definition plasma television
o 3.1.1 ED resolutions
+ 3.2 High-definition plasma television
* 4 Design
* 5 Contrast ratio
* 6 Screen burn-in
* 7 Environmental impact
* 8 History
+ 8.1 Early development
+ 8.2 1980s
+ 8.3 1990s
+ 8.4 2000s
+ 8.5 2010s
* 9 Notable display manufacturers
* 10 See also
* 11 References
* 12 External links
General characteristics[edit]
Plasma displays are bright (1,000 lux or higher for the display
module), have a wide color gamut, and can be produced in fairly large
sizes--up to 3.8 metres (150 in) diagonally. They had a very low
luminance "dark-room" black level compared with the lighter grey of the
unilluminated parts of an LCD screen. (As plasma panels are locally lit
and do not require a back light, blacks are blacker on plasma and
grayer on LCD's.)^[6] LED-backlit LCD televisions have been developed
to reduce this distinction. The display panel itself is about 6 cm
(2.4 in) thick, generally allowing the device's total thickness
(including electronics) to be less than 10 cm (3.9 in). Power
consumption varies greatly with picture content, with bright scenes
drawing significantly more power than darker ones - this is also true
for CRTs as well as modern LCDs where LED backlight brightness is
adjusted dynamically. The plasma that illuminates the screen can reach
a temperature of at least 1200 DEGC (2200 DEGF). Typical power
consumption is 400 watts for a 127 cm (50 in) screen. Most screens are
set to "vivid" mode by default in the factory (which maximizes the
brightness and raises the contrast so the image on the screen looks
good under the extremely bright lights that are common in big box
stores), which draws at least twice the power (around 500-700 watts) of
a "home" setting of less extreme brightness.^[7] The lifetime of the
latest generation of plasma displays is estimated at 100,000 hours (11
years) of actual display time, or 27 years at 10 hours per day. This is
the estimated time over which maximum picture brightness degrades to
half the original value.^[8]
Plasma screens are made out of glass, which may result in glare on the
screen from nearby light sources. Plasma display panels cannot be
economically manufactured in screen sizes smaller than 82 centimetres
(32 in).^[9]^[10] Although a few companies have been able to make
plasma enhanced-definition televisions (EDTV) this small, even fewer
have made 32 inch plasma HDTVs. With the trend toward large-screen
television technology, the 32 inch screen size is rapidly disappearing.
Though considered bulky and thick compared with their LCD counterparts,
some sets such as Panasonic's Z1 and Samsung's B860 series are as slim
as 2.5 cm (1 in) thick making them comparable to LCDs in this respect.
Competing display technologies include cathode-ray tube (CRT), organic
light-emitting diode (OLED), CRT projectors, AMLCD, Digital Light
Processing DLP, SED-tv, LED display, field emission display (FED), and
quantum dot display (QLED).
Plasma display advantages and disadvantages[edit]
Further information: Comparison of CRT, LCD, Plasma, and OLED
Advantages[edit]
* Capable of producing deeper blacks than LCD allowing for a superior
contrast ratio.^[11]^[12]^[13]
* As they use the same or similar phosphors as are used in CRT
displays, plasma's color reproduction is very similar to that of
CRTs.
* Wider viewing angles than those of LCD; images do not suffer from
degradation at less than straight ahead angles like LCDs. LCDs
using IPS technology have the widest angles, but they do not equal
the range of plasma primarily due to "IPS glow", a generally
whitish haze that appears due to the nature of the IPS pixel
design.^[11]^[12]
* Less visible motion blur, thanks in large part to very high refresh
rates and a faster response time, contributing to superior
performance when displaying content with significant amounts of
rapid motion such as auto racing, hockey, baseball,
etc.^[11]^[12]^[14]^[15]
* Superior uniformity. LCD panel backlights nearly always produce
uneven brightness levels, although this is not always noticeable.
High-end computer monitors have technologies to try to compensate
for the uniformity problem.^[16]^[17]
* Unaffected by clouding from the polishing process. Some LCD panel
types, like IPS, require a polishing process that can introduce a
haze usually referred to as "clouding".^[18]
* In their heyday, they were less expensive for the buyer per square
inch than LCD, particularly when considering equivalent
performance.^[19]
Disadvantages[edit]
* Earlier generation displays were more susceptible to screen burn-in
and image retention. Recent models have a pixel orbiter that moves
the entire picture slower than is noticeable to the human eye,
which reduces the effect of burn-in but does not prevent it.^[20]
* Due to the bistable nature of the color and intensity generating
method, some people will notice that plasma displays have a
shimmering or flickering effect with a number of hues, intensities
and dither patterns.
* Earlier generation displays (circa 2006 and prior) had phosphors
that lost luminosity over time, resulting in gradual decline of
absolute image brightness. Newer models have advertised lifespans
exceeding 100,000 hours (11 years), far longer than older
CRTs.^[8]^[13]
* Uses more electrical power, on average, than an LCD TV using a LED
backlight. Older CCFL backlights for LCD panels used quite a bit
more power, and older plasma TVs used quite a bit more power than
recent models.^[21]^[22]
* Does not work as well at high altitudes above 6,500 feet (2,000
meters)^[23] due to pressure differential between the gases inside
the screen and the air pressure at altitude. It may cause a buzzing
noise. Manufacturers rate their screens to indicate the altitude
parameters.^[23]
* For those who wish to listen to AM radio, or are amateur radio
operators (hams) or shortwave listeners (SWL), the radio frequency
interference (RFI) from these devices can be irritating or
disabling.^[24]
* Plasma displays are generally heavier than LCD and may require more
careful handling, such as being kept upright.
* More susceptible to glare.
Native plasma television resolutions[edit]
Further information: Native resolution
Fixed-pixel displays such as plasma TVs scale the video image of each
incoming signal to the native resolution of the display panel. The most
common native resolutions for plasma display panels are 852 *480
(EDTV), 1,366 *768 and 1920 *1080 (HDTV). As a result, picture quality
varies depending on the performance of the video scaling processor and
the upscaling and downscaling algorithms used by each display
manufacturer.^[25]^[26]
Enhanced-definition plasma television[edit]
Main article: Enhanced-definition television
Early plasma televisions were enhanced-definition (ED) with a native
resolution of 840 *480 (discontinued) or 852 *480 and down-scaled their
incoming high-definition video signals to match their native display
resolutions.^[27]
ED resolutions[edit]
The following ED resolutions were common prior to the introduction of
HD displays, but have long been phased out in favor of HD displays, as
well as because the overall pixel count in ED displays is lower than
the pixel count on SD PAL displays (852 *480 vs 720 *576,
respectively).
* 840 *480p
* 852 *480p
High-definition plasma television[edit]
Early high-definition (HD) plasma displays had a resolution of
1024x1024 and were alternate lighting of surfaces (ALiS) panels made by
Fujitsu and Hitachi.^[28]^[29] These were interlaced displays, with
non-square pixels.^[30]
Later HDTV plasma televisions usually have a resolution of 1,024 *768
found on many 42 inch plasma screens, 1280 *768 and 1,366 *768 found on
50 in, 60 in, and 65 in plasma screens, or 1920 *1080 found on plasma
screen sizes from 42 inch to 103 inch. These displays are usually
progressive displays, with non-square pixels, and will up-scale and
de-interlace their incoming standard-definition signals to match their
native display resolutions. 1024 *768 resolution requires that 720p
content be downscaled in one direction and upscaled in the
other.^[31]^[32]
Design[edit]
See also: Plasma (physics)
Ionized gases such as the ones shown here are confined to millions of
tiny individual compartments across the face of a plasma display, to
collectively form a visual image.
Composition of plasma display panel
A panel of a plasma display typically comprises millions of tiny
compartments in between two panels of glass. These compartments, or
"bulbs" or "cells", hold a mixture of noble gases and a minuscule
amount of another gas (e.g., mercury vapor). Just as in the fluorescent
lamps over an office desk, when a high voltage is applied across the
cell, the gas in the cells forms a plasma. With flow of electricity
(electrons), some of the electrons strike mercury particles as the
electrons move through the plasma, momentarily increasing the energy
level of the atom until the excess energy is shed. Mercury sheds the
energy as ultraviolet (UV) photons. The UV photons then strike phosphor
that is painted on the inside of the cell. When the UV photon strikes a
phosphor molecule, it momentarily raises the energy level of an outer
orbit electron in the phosphor molecule, moving the electron from a
stable to an unstable state; the electron then sheds the excess energy
as a photon at a lower energy level than UV light; the lower energy
photons are mostly in the infrared range but about 40% are in the
visible light range. Thus the input energy is converted to mostly
infrared but also as visible light. The screen heats up to between 30
and 41 DEGC (86 and 106 DEGF) during operation. Depending on the
phosphors used, different colors of visible light can be achieved. Each
pixel in a plasma display is made up of three cells comprising the
primary colors of visible light. Varying the voltage of the signals to
the cells thus allows different perceived colors.
The long electrodes are stripes of electrically conducting material
that also lies between the glass plates in front of and behind the
cells. The "address electrodes" sit behind the cells, along the rear
glass plate, and can be opaque. The transparent display electrodes are
mounted in front of the cell, along the front glass plate. As can be
seen in the illustration, the electrodes are covered by an insulating
protective layer.^[33] A magnesium oxide layer may be present to
protect the dielectric layer and to emit secondary electrons.^[34]^[35]
Control circuitry charges the electrodes that cross paths at a cell,
creating a voltage difference between front and back. Some of the atoms
in the gas of a cell then lose electrons and become ionized, which
creates an electrically conducting plasma of atoms, free electrons, and
ions. The collisions of the flowing electrons in the plasma with the
inert gas atoms leads to light emission; such light-emitting plasmas
are known as glow discharges.^[36]^[37]^[38]
Relative spectral power of red, green and blue phosphors of a common
plasma display. The units of spectral power are simply raw sensor
values (with a linear response at specific wavelengths).
In a monochrome plasma panel, the gas is mostly neon, and the color is
the characteristic orange of a neon-filled lamp (or sign). Once a glow
discharge has been initiated in a cell, it can be maintained by
applying a low-level voltage between all the horizontal and vertical
electrodes-even after the ionizing voltage is removed. To erase a cell
all voltage is removed from a pair of electrodes. This type of panel
has inherent memory. A small amount of nitrogen is added to the neon to
increase hysteresis.^[citation needed] In color panels, the back of
each cell is coated with a phosphor. The ultraviolet photons emitted by
the plasma excite these phosphors, which give off visible light with
colors determined by the phosphor materials. This aspect is comparable
to fluorescent lamps and to the neon signs that use colored phosphors.
Every pixel is made up of three separate subpixel cells, each with
different colored phosphors. One subpixel has a red light phosphor, one
subpixel has a green light phosphor and one subpixel has a blue light
phosphor. These colors blend together to create the overall color of
the pixel, the same as a triad of a shadow mask CRT or color LCD.
Plasma panels use pulse-width modulation (PWM) to control brightness:
by varying the pulses of current flowing through the different cells
thousands of times per second, the control system can increase or
decrease the intensity of each subpixel color to create billions of
different combinations of red, green and blue. In this way, the control
system can produce most of the visible colors. Plasma displays use the
same phosphors as CRTs, which accounts for the extremely accurate color
reproduction when viewing television or computer video images (which
use an RGB color system designed for CRT displays).
Plasma displays are different from liquid crystal displays (LCDs),
another lightweight flat-screen display using very different
technology. LCDs may use one or two large fluorescent lamps as a
backlight source, but the different colors are controlled by LCD units,
which in effect behave as gates that allow or block light through red,
green, or blue filters on the front of the LCD panel.^[11]^[39]^[40]
To produce light, the cells need to be driven at a relatively high
voltage (~300 volts) and the pressure of the gases inside the cell
needs to be low (~500 torr).^[41]
Contrast ratio[edit]
Contrast ratio is the difference between the brightest and darkest
parts of an image, measured in discrete steps, at any given moment.
Generally, the higher the contrast ratio, the more realistic the image
is (though the "realism" of an image depends on many factors including
color accuracy, luminance linearity, and spatial linearity). Contrast
ratios for plasma displays are often advertised as high as
5,000,000:1.^[42] On the surface, this is a significant advantage of
plasma over most other current display technologies, a notable
exception being organic light-emitting diode. Although there are no
industry-wide guidelines for reporting contrast ratio, most
manufacturers follow either the ANSI standard or perform a
full-on-full-off test. The ANSI standard uses a checkered test pattern
whereby the darkest blacks and the lightest whites are simultaneously
measured, yielding the most accurate "real-world" ratings. In contrast,
a full-on-full-off test measures the ratio using a pure black screen
and a pure white screen, which gives higher values but does not
represent a typical viewing scenario. Some displays, using many
different technologies, have some "leakage" of light, through either
optical or electronic means, from lit pixels to adjacent pixels so that
dark pixels that are near bright ones appear less dark than they do
during a full-off display. Manufacturers can further artificially
improve the reported contrast ratio by increasing the contrast and
brightness settings to achieve the highest test values. However, a
contrast ratio generated by this method is misleading, as content would
be essentially unwatchable at such settings.^[43]^[44]^[45]
Each cell on a plasma display must be precharged before it is lit,
otherwise the cell would not respond quickly enough. Precharging
normally increases power consumption, so energy recovery mechanisms may
be in place to avoid an increase in power consumption.^[46]^[47]^[48]
This precharging means the cells cannot achieve a true black,^[49]
whereas an LED backlit LCD panel can actually turn off parts of the
backlight, in "spots" or "patches" (this technique, however, does not
prevent the large accumulated passive light of adjacent lamps, and the
reflection media, from returning values from within the panel). Some
manufacturers have reduced the precharge and the associated background
glow, to the point where black levels on modern plasmas are starting to
become close to some high-end CRTs Sony and Mitsubishi produced ten
years before the comparable plasma displays. With an LCD, black pixels
are generated by a light polarization method; many panels are unable to
completely block the underlying backlight. More recent LCD panels using
LED illumination can automatically reduce the backlighting on darker
scenes, though this method cannot be used in high-contrast scenes,
leaving some light showing from black parts of an image with bright
parts, such as (at the extreme) a solid black screen with one fine
intense bright line. This is called a "halo" effect which has been
minimized on newer LED-backlit LCDs with local dimming. Edgelit models
cannot compete with this as the light is reflected via a light guide to
distribute the light behind the panel.^[11]^[12]^[13]
Screen burn-in[edit]
Main article: Screen burn-in
An example of a plasma display that has suffered severe burn-in from
static text
Image burn-in occurs on CRTs and plasma panels when the same picture is
displayed for long periods. This causes the phosphors to overheat,
losing some of their luminosity and producing a "shadow" image that is
visible with the power off. Burn-in is especially a problem on plasma
panels because they run hotter than CRTs. Early plasma televisions were
plagued by burn-in, making it impossible to use video games or anything
else that displayed static images.
Plasma displays also exhibit another image retention issue which is
sometimes confused with screen burn-in damage. In this mode, when a
group of pixels are run at high brightness (when displaying white, for
example) for an extended period, a charge build-up in the pixel
structure occurs and a ghost image can be seen. However, unlike
burn-in, this charge build-up is transient and self-corrects after the
image condition that caused the effect has been removed and a long
enough period has passed (with the display either off or on).
Plasma manufacturers have tried various ways of reducing burn-in such
as using gray pillarboxes, pixel orbiters and image washing routines,
but none to date have eliminated the problem and all plasma
manufacturers continue to exclude burn-in from their
warranties.^[13]^[50]
Environmental impact[edit]
See also: Discontinuation in 2010s
Plasma screens use significantly more energy than CRT and LCD
screens.^[51]
History[edit]
Early development[edit]
Plasma displays were first used in PLATO computer terminals. This PLATO
V model illustrates the display's monochromatic orange glow seen in
1981.^[52]
Kalman Tihanyi, a Hungarian engineer, described a proposed flat-panel
plasma display system in a 1936 paper.^[53]
The first practical plasma video display was co-invented in 1964 at the
University of Illinois at Urbana-Champaign by Donald Bitzer, H. Gene
Slottow, and graduate student Robert Willson for the PLATO computer
system.^[54]^[55] The original neon orange monochrome Digivue display
panels built by glass producer Owens-Illinois were very popular in the
early 1970s because they were rugged and needed neither memory nor
circuitry to refresh the images.^[56] A long period of sales decline
occurred in the late 1970s because semiconductor memory made CRT
displays cheaper than the $2500 USD 512 * 512 PLATO plasma
displays.^[57] Nonetheless, the plasma displays' relatively large
screen size and 1 inch thickness made them suitable for high-profile
placement in lobbies and stock exchanges.
Burroughs Corporation, a maker of adding machines and computers,
developed the Panaplex display in the early 1970s. The Panaplex
display, generically referred to as a gas-discharge or gas-plasma
display,^[58] uses the same technology as later plasma video displays,
but began life as a seven-segment display for use in adding machines.
They became popular for their bright orange luminous look and found
nearly ubiquitous use throughout the late 1970s and into the 1990s in
cash registers, calculators, pinball machines, aircraft avionics such
as radios, navigational instruments, and stormscopes; test equipment
such as frequency counters and multimeters; and generally anything that
previously used nixie tube or numitron displays with a high
digit-count. These displays were eventually replaced by LEDs because of
their low current-draw and module-flexibility, but are still found in
some applications where their high brightness is desired, such as
pinball machines and avionics.
1980s[edit]
In 1983, IBM introduced a 19-inch (48 cm) orange-on-black monochrome
display (Model 3290 Information Panel) which was able to show up to
four simultaneous IBM 3270 terminal sessions. By the end of the decade,
orange monochrome plasma displays were used in a number of high-end
AC-powered portable computers, such as the Compaq Portable 386 (1987)
and the IBM P75 (1990). Plasma displays had a better contrast ratio,
viewability angle, and less motion blur than the LCDs that were
available at the time, and were used until the introduction of
active-matrix color LCD displays in 1992.^[59]
Due to heavy competition from monochrome LCDs used in laptops and the
high costs of plasma display technology, in 1987 IBM planned to shut
down its factory in Kingston, New York, the largest plasma plant in the
world, in favor of manufacturing mainframe computers, which would have
left development to Japanese companies.^[60] Dr. Larry F. Weber, a
University of Illinois ECE PhD (in plasma display research) and staff
scientist working at CERL (home of the PLATO System), co-founded
Plasmaco with Stephen Globus and IBM plant manager James Kehoe, and
bought the plant from IBM for US$50,000. Weber stayed in Urbana as CTO
until 1990, then moved to upstate New York to work at Plasmaco.
1990s[edit]
In 1992, Fujitsu introduced the world's first 21-inch (53 cm)
full-color display. It was based on technology created at the
University of Illinois at Urbana-Champaign and NHK Science & Technology
Research Laboratories.
In 1994, Weber demonstrated a color plasma display at an industry
convention in San Jose. Panasonic Corporation began a joint development
project with Plasmaco, which led in 1996 to the purchase of Plasmaco,
its color AC technology, and its American factory for US$26 million.
In 1995, Fujitsu introduced the first 42-inch (107 cm) plasma display
panel;^[61]^[62] it had 852 *480 resolution and was progressively
scanned.^[63] Two years later, Philips introduced the first large
commercially available flat-panel TV, using the Fujitsu panels. It was
available at four Sears locations in the US for $14,999, including
in-home installation. Pioneer also began selling plasma televisions
that year, and other manufacturers followed. By the year 2000 prices
had dropped to $10,000.
2000s[edit]
In the year 2000, the first 60-inch plasma display was developed by
Plasmaco. Panasonic was also reported to have developed a process to
make plasma displays using ordinary window glass instead of the much
more expensive "high strain point" glass.^[64] High strain point glass
is made similarly to conventional float glass, but it is more heat
resistant, deforming at higher temperatures. High strain point glass is
normally necessary because plasma displays have to be baked during
manufacture to dry the rare-earth phosphors after they are applied to
the display. However, high strain point glass may be less scratch
resistant.^[65]^[66]^[67]^[68]
Plasma displays became 75% thinner between 2006 and 2011
In late 2006, analysts noted that LCDs had overtaken plasmas,
particularly in the 40-inch (100 cm) and above segment where plasma had
previously gained market share.^[69] Another industry trend was the
consolidation of plasma display manufacturers, with around 50 brands
available but only five manufacturers. In the first quarter of 2008, a
comparison of worldwide TV sales broke down to 22.1 million for
direct-view CRT, 21.1 million for LCD, 2.8 million for plasma, and 0.1
million for rear projection.^[70]
Until the early 2000s, plasma displays were the most popular choice for
HDTV flat panel display as they had many benefits over LCDs. Beyond
plasma's deeper blacks, increased contrast, faster response time,
greater color spectrum, and wider viewing angle; they were also much
bigger than LCDs, and it was believed that LCDs were suited only to
smaller sized televisions. However, improvements in VLSI fabrication
narrowed the technological gap. The increased size, lower weight,
falling prices, and often lower electrical power consumption of LCDs
made them competitive with plasma television sets.
Screen sizes have increased since the introduction of plasma displays.
The largest plasma video display in the world at the 2008 Consumer
Electronics Show in Las Vegas, Nevada, was a 150-inch (380 cm) unit
manufactured by Matsushita Electric Industrial (Panasonic) standing
6 ft (180 cm) tall by 11 ft (330 cm) wide.^[71]^[72]
2010s[edit]
At the 2010 Consumer Electronics Show in Las Vegas, Panasonic
introduced their 152" 2160p 3D plasma. In 2010, Panasonic shipped 19.1
million plasma TV panels.^[73]
In 2010, the shipments of plasma TVs reached 18.2 million units
globally.^[74] Since that time, shipments of plasma TVs have declined
substantially. This decline has been attributed to the competition from
liquid crystal (LCD) televisions, whose prices have fallen more rapidly
than those of the plasma TVs.^[75] In late 2013, Panasonic announced
that they would stop producing plasma TVs from March 2014 onwards.^[76]
In 2014, LG and Samsung discontinued plasma TV production as
well,^[77]^[78] effectively killing the technology, probably because of
lowering demand.
Notable display manufacturers[edit]
Most have discontinued doing so, but at one time or another all of
these companies have produced products containing plasma displays:
* Beko (known sometimes as Grundig)
* Fujitsu (only produced panels^[79])
* Funai
* Gradiente
* Chunghwa Picture Tubes (only produced panels ^[80])
* Formosa plastics (only produced panels^[81])
* Hitachi (produced panels^[82])
* JVC
* Lanix
* LG (produced panels^[83])
* Magnavox
* Marantz
* NEC (only produced panels^[79])
* Orion
* Panasonic Viera (produced panels^[1]^[2]^[84]^[85])
* Philips
* Pioneer (produced panels^[86])
* ProScan
* Protron
* Samsung (produced panels^[87])
* Sanyo
* Sony BRAVIA (produced panels^[79])
* Toshiba (produced panels^[88])
* Vestel (both under Vestel name but also under various brands)
Panasonic was the biggest plasma display manufacturer until 2013, when
it decided to discontinue plasma production. In the following months,
Samsung and LG also ceased production of plasma sets. Panasonic,
Samsung and LG were the last plasma manufacturers for the U.S. retail
market.
See also[edit]
* Display examples
* Large-screen television technology
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External links[edit]
Wikimedia Commons has media related to Plasma displays.
* Plasma display panels: The colorful history of an Illinois
technology' ' by Jamie Hutchinson, Electrical and Computer
Engineering Alumni News, Winter 2002-2003 (via archive.org)
* NYTimes.com - Forget L.C.D.; Go for Plasma, Says Maker of Both
according to Panasonic Corporation
* Home Theater Geeks - 13: Plasma Geek Out (audio podcast)
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