Flat panel displays such as LCDs and plasma panels are thinner and lighter than traditional CRT displays. LCDs are the most common type of flat panel display and work by modulating liquid crystals to control the amount of light that passes through. Plasma displays use small cells containing electrically charged gases to create images. While flat panels have advantages over CRTs like size and weight, CRTs provide better picture quality with higher dynamic range and response times.
Liquid-crystal-display televisions (LCD TV) are television sets that use LCD display technology to produce images. LCD televisions are thinner and lighter than cathode ray tube (CRTs) of similar display size, and are available in much larger sizes.
Liquid-crystal-display televisions (LCD TV) are television sets that use LCD display technology to produce images. LCD televisions are thinner and lighter than cathode ray tube (CRTs) of similar display size, and are available in much larger sizes.
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Flexible displays are essentially very thin display screens that can be printed onto flexible or stretchable material and then attached to other surfaces or produced in a variety of shapes
Computer Graphics is an advance field in information technology and all about manipulation and rendering of images. This presentation covers all the main concepts in computer graphics including graphics algorithms.
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Computer graphics report
1. Computer
Graphics
Topic: - Flat - Panel displays
Submitted to: Submitted by:
As. Prof Aman Deep Kaur Alisha Korpal
Nivia Jain
Sharuti Jain
1|Page
2. Index
S no Topic Page no
1 Introduction
2 CRT
3 Advantages & disadvantages
4 Flat panel
5 Types
6 Emissive
7 LCD
8 Plasma Panel
2|Page
3. Introduction
Video display devices
A display device is an output device for presentation of information in visual or tactile
form (the later used for example in tactile electronic displays for blind people). When the
input information is supplied as an electrical signal, the display is called an electronic
display.
How the interactive Graphics display works
The modern graphics display is extremely simple in construction.
Three components:
A digital memory or frame buffer in which the displayed image is stored as
a matrix of intensity values
A monitor
Display controller, which is a simple interface that passes he content of
frame buffer to the monitor. Inside the frame buffer the image is stored as
pattern of binary digital numbers, which represents a rectangular array of
picture elements or pixel.
3|Page
4. Types of video display devices:
Cathode Ray Tube
Flat - Panel Display
4|Page
5. Cathode Ray Tube
The cathode ray tube (CRT) is a vacuum tube containing an electron gun (a source of
electrons) and a fluorescent screen, with internal or external means to accelerate and
deflect the electron beam, used to create images in the form of light emitted from the
fluorescent screen. The image may represent electrical waveforms (oscilloscope),
pictures (television, computer monitor), radar targets and others.
The CRT uses an evacuated glass envelope which is large, deep, heavy, and relatively
fragile.
Cathode rays (also called an electron beam or e-beam) are streams
of electrons observed in vacuum tubes. If an evacuated glass tube is equipped with
two electrodes and a voltage is applied, the glass opposite of the negative electrode is
observed to glow, due to electrons emitted from and travelling perpendicular to
the cathode (the electrode connected to the negative terminal of the voltage supply).
They were first observed in 1869 by German physicist Johann Hittorf, and were named
in 1876 by Eugen Goldstein kathodenstrahlen, or cathode rays.
Electrons were first discovered as the constituents of cathode rays. In 1897 British
physicist J. J. Thomson showed the rays were composed of a previously unknown
negatively charged particle, which was later named the electron. Cathode ray
tubes (CRTs) using a focused beam of electrons deflected by electric or magnetic fields,
create the image in a classic television set.
5|Page
6. Advantages and Disadvantages
Advantages
→ High dynamic range (up to around 15,000:1), excellent color, wide gamut and
low black level. The color range of CRTs is unmatched by any display type
except OLED.
→ Can display in almost any resolution and refresh rate
→ No input lag
→ Sub-millisecond response times
→ Near zero color, saturation, contrast or brightness distortion. Excellent viewing
angle.
→ Allows the use of light guns/pens
Disadvantages
→ Large size and weight, especially for bigger screens (a 20-inch (51 cm) unit
weighs about 50 lb (23 kg))
→ High power consumption
→ Generates a considerable amount of heat when running
→ Geometric distortion caused by variable beam travel distances
→ Can suffer screen burn-in
→ Produces noticeable flicker at low refresh rates
→ Color displays (at PAL or NTSC resolution) cannot be made in sizes smaller than
7 inches without incurring quasi-exponential cost increases per centimeter
decrease in size.
→ The maximum practical size for CRTs is around 24 inches for computer
monitors; most direct view CRT televisions are 36 inches or smaller, with regular-
production models limited to about 40 inches.
6|Page
7. Flat Panel Displays
Flat panel displays (sometimes called Flat screen, however, strictly Flat screen is also
used to describe CRT screens that have a completely flat front surface) encompass a
growing number of electronic visual display technologies enabling much lighter and
thinner than traditional television set and video displays that use cathode ray
tubes (CRT), and are usually less than 100 mm (4 inches) thick. They can be divided
into two general display technology categories; volatile and static.
The first ever flat panel display was invented in 1964 at the University of Illinois.
In many applications, specifically modern portable devices such as laptops, cellular
phones, and digital cameras, camcorders, compact cameras, Pocket video camera,
whatever disadvantages exist are made up for by the portability requirements.
A very thin display screen used in portable computers. Nearly all modern flat-panel
displays use LCD technologies. Most LCD screens are backlit to make them easier to
read in bright environments.
7|Page
8. Types of Flat panel Displays
Emissive display devices
o Plasma panels
o Electroluminescent displays
Non emissive display devices
o LCD
8|Page
9. Emissive display devices
A emission display (FED) is a display technology that incorporates flat panel
display technology that uses large-area field electron emission sources to provide
electrons that strike colored phosphor to produce a color image as a electronic visual
display. In a general sense, a FED consists of a matrix of cathode ray tubes, each tube
producing a single sub-pixel, grouped in threes to form red-green-blue (RGB) pixels.
FEDs combine the advantages of CRTs, namely their high contrast levels and very fast
response times, with the packaging advantages of LCD and other flat panel
technologies. They also offer the possibility of requiring less power, about half that of an
LCD system.
After considerable time and effort in the early and mid-2000s, Sony's FED efforts started
winding down in 2009 as LCD became the dominant technology. In January 2010, AU
Optronics announced that it acquired essential FED assets from Sony and intends to
continue development of the technology.
FEDs are closely related to another developing display technology, the surface-
conduction electron-emitter display, or SED, differing primarily in details of the electron
emission system. In August 2010, Canon announced they were shutting down their joint
effort to develop SEDs commercially, signaling the end of development efforts.
9|Page
10. LCD
A liquid crystal display (LCD) is a flat panel display, electronic visual display, video
display that uses the light modulating properties of liquid crystals (LCs). LCs do not emit
light directly.
They are used in a wide range of applications, including computer monitors, television,
instrument panels, aircraft cockpit displays, signage, etc. They are common in
consumer devices such as video players, gaming devices, clocks, watches, calculators,
and telephones. LCDs have displaced cathode ray tube (CRT) displays in most
applications. They are usually more compact, lightweight, portable, less expensive,
more reliable, and easier on the eyes. They are available in a wider range of screen
sizes than CRT and plasma displays, and since they do not use phosphors, they cannot
suffer image burn-in.
LCDs are more energy efficient and offer safer disposal than CRTs. Its low electrical
power consumption enables it to be used in battery-powered electronic equipment. It is
an electronically modulated optical device made up of any number of segments filled
with liquid crystals and arrayed in front of a light source (backlight) or reflector to
produce images in color or monochrome. The most flexible ones use an array of
small pixels. The earliest discovery leading to the development of LCD technology, the
discovery of liquid crystals, dates from 1888. By 2008, worldwide sales of televisions
with LCD screens had surpassed the sale of CRT units.
10 | P a g e
11. Plasma display
A plasma display panel (PDP) is a type of flat panel display common to large TV
displays 30 inches (76 cm) or larger. They are called "plasma" displays because the
technology utilizes small cells containing electrically charged ionized gases, or what are
in essence chambers more commonly known as fluorescent lamps.
Plasma displays are bright. They have a very low-luminance "dark-room" black level
compared to the lighter grey of the un illuminated parts of an LCD screen (i.e. the blacks
are blacker on plasmas and greyer on LCDs). LED-backlit LCD televisions have been
developed to reduce this distinction. The display panel itself is about 6 cm (2.5 inches)
thick, generally allowing the device's total thickness (including electronics) to be less
than 10 cm (4 inches). Plasma displays use as much power per square meter as
a CRT or an AMLCD television. Power consumption varies greatly with picture content,
with bright scenes drawing significantly more power than darker ones – this is also true
of CRTs. Typical power consumption is 400 watts for a 50-inch (127 cm) screen. 200 to
310 watts for a 50-inch (127 cm) display when set to cinema mode. Most screens are
set to 'shop' mode by default, which draws at least twice the power (around 500–700
watts) of a 'home' setting of less extreme brightness. Panasonic has greatly reduced
power consumption ("1/3 of 2007 models") Panasonic states that PDPs will consume
only half the power of their previous series of plasma sets to achieve the same overall
brightness for a given display size. The lifetime of the latest generation of plasma
displays is estimated at 100,000 hours 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.
11 | P a g e
12. Plasma display screens are made from glass, which reflects more light than the material
used to make an LCD screen. This causes glare from reflected objects in the viewing
area. Companies such as Panasonic coat their newer plasma screens with an anti-glare
filter material. Currently, plasma panels cannot be economically manufactured in screen
sizes smaller than 32 inches. Although a few companies have been able to make
plasma Enhanced-definition televisions (EDTV) this small, even fewer have made 32in
plasma HDTVs. With the trend toward large-screen television technology, the 32in
screen size is rapidly disappearing. Though considered bulky and thick compared to
their LCD counterparts, some sets such as Panasonic's Z1 and Samsung's B860 series
are as slim as one inch thick making them comparable to LCDs in this respect.
Competing display technologies include Cathode ray tube (CRT), Organic light-emitting
diode (OLED), AMLCD, Digital Light Processing DLP, SED-tv, LED display, field
emission display(FED), and Quantum dot display (QLED).
12 | P a g e
13. Advantages
Picture quality
Capable of producing deeper blacks allowing for superior contrast ratio
Wider viewing angles than those of LCD; images do not suffer from degradation
at high angles like LCDs
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
Slim profile
Can be wall mounted
Less bulky than rear-projection televisions
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14. Disadvantages
Earlier generation displays were more susceptible to screen burn-in and image
retention, although most recent models have a pixel orbiter that moves the entire
picture faster than is noticeable to the human eye, which reduces the effect of
burn-in but does not prevent it.
Earlier generation displays (2006 and prior) had phosphors that lost luminosity
over time, resulting in gradual decline of absolute image brightness (newer
models are less susceptible to this, having life spans exceeding 100,000 hours,
far longer than older CRT technology) Earlier generation (circa 2001 and earlier)
models were susceptible to "large area flicker"
Heavier screen-door effect when compared to LCD or OLED based TVs
Generally do not come in smaller sizes than 37 inches
Heavier than LCD due to the requirement of a glass screen to hold the gases
Use more electricity, on average, than an LCD TV
Do not work as well at high altitudes 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.
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.
Due to the strong infrared emissions inherent with the technology, standard IR
repeater systems can not be used in the viewing room. A more expensive
"plasma compatible" sensor must be used.
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