crt led plasma ppt
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Crt Led Plasma PptTRANSCRIPT
LCD , LED
AND
PLASMA TV
INTRODUCTION
Television (TV) is a telecommunication medium for transmitting and receiving moving images that can be monochrome (Black and White) or colored, with or without accompanying sound.
The word Tele is a Greek word meaning Distant and Vision meaning Sight.
The components used in old TV's are essentially very similar to the components used in modern TV's; that is, they perform the same function as their modern counterparts. Where they differ greatly however, is in their size.
There are different types of TV depending upon the display device used.
Display Device
A display device is an output device for presentation of information in visual form. When the input information is supplied as an electrical signal, the display is called an electronic display.
Types of Display Devices
Cathode Ray Tube
Flat - Panel Display
Flow chart
CATHODE RAY TUBE
Thecathode ray tube(CRT) is avacuum tubecontaining anelectron gun(a source of electrons) and afluorescentscreen, 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.
FLAT PANEL DISPLAY
Flat panel displays (sometimes referred to as flatscreens, which more technically mean screens with fully flat front surfaces) encompass a growing number of electronic visual display technologies.
They are far lighter and thinner than traditional television sets and video displays that use cathode ray tubes (CRTs), and are usually less than 10 centimetres (3.9in) thick.
Types of Flat panel Displays
Emissive display devices
Plasma panels
Electroluminescent displays
Non emissive display devicesLCD
LIQUID CRYSTAL DISPLAY(LCD)
Liquid-crystal display televisions (LCD TV) are color television sets that use LCD technology to produce images
Produces colored image by selecting filtering a white light
Thinner and lighter than CRTs of similar display size
The concept of LCD was 1st brought up by Philips
LIQUID CRYSTAL DISPLAY
Liquid Crystal a stable phase of matter characterized by anisotropic properties without the existence of a 3-dimensional crystal lattice generally lying between the solid and isotropic (liquid) phase.
ISOTROPICANISOTROPIC(Liquid Crystalshave orientational order)
(Liquids and gases)
LIQUID CRYSTAL MODEL
Unique Properties of Liquid Crystals
The orientation of Liquid Crystals can be affected by
Pressure
Temperature
Electrical Field
LCD Preparation
Checking the ITO GlassRubbing the PVA to create an alignment layerRemoving the PVA at one edgePlacing the Saran Wrap SpacersApplying the Liquid CrystalPlacing the Polarizers at 90
Cross-sectional view
LCD Technology
Electrical-fieldNOT AppliedLight IS transmittedElectrical-fieldIS AppliedLight NOT transmitted
LCD PIXEL
PROPERTIES OF LCD DISPLAY Light weight (typ. 1/5 of CRT)
power consumption (typ. 1/4 of CRT)
No electromagnetic emission
Large screens (>20 inch) on desktops
Completely flat screen - no geometrical errors
Crisp pictures - digital and uniform colors
Fully digital signal processing possible
Low luminance (typ. 200 cd/m2)
Led-Tvs
An LED-backlit LCD display is a flat panel display that uses LED backlighting instead of the cold cathode (CCFL) backlighting used in other LCD displays.
While not an LED display, televisions using this display are called "LED TV" by some manufacturers and suppliers.
The use of LED backlighting allows for a thinner panel, lower power consumption, better heat dissipation, a brighter display, and better contrast levels
Difference between LCD and LEDProduce images with greater dynamic contrast;
With edge-LED lighting can be extremely slim, some screens less than half an inch (0.92cm) thick.
Offer a wider color gamut when RGB-LED backlighting is used.
Produce less environmental pollution on disposal;
Are more expensive;
Have typically 20 to 30% lower power consumption;
Are more reliable.
Can allow a wider dimming range.
PLASMA TV
Plasma display screens are made from glass, which reflects more light than the material used to make an LCD screen.
A plasma display panel (PDP) is a type of flat panel display common to large TV displays 30 inches (76cm) or larger.
They are called "plasma" displays because the technology utilizes small cells containing electrically charged ionized gases
Capable of producing deeper blacks allowing for superior contrast ratio
PLASMA
Plasma is a state of matter similar to gas in which a certain portion of the particles are ionized.
Heating a gas may ionize its molecules or atoms (reduce or increase the number of electrons in them), thus turning it into a plasma, which contains charged particles: positive ions and negative electrons or ions.
In the universe, plasma is the most common state of matter. Some common plasmas are stars and neon signs.
PLASMA LAMP
PLASMA DISPLAY PANELS
Cross-sectional view
FUTURE TECHNOLOGY OF TV
OLED (Organic light emitting diode)Sony introduced this technology in 2008
It doesnt required backlighting
Allow less power consumption
Screen are so thin and so flexible that one can roll them up like a carpet
We will have OLED based TV in our living room around 2015
SURFACE CONDUCTION ELECTRON (SED)
Better quality picture.
Power efficient.
Long lasting
Canon the originator of SED
LASER TV
The laser technology claims that the technology will allow displays with a richer, more vibrant colour palette than the conventional plasma, LCD or CRT displays
They also claim the displays will:
be half the weight and cost of plasma displays
require around 25% of the power required by Plasma displays
be very thin like plasma and LCD displays are today
3D TV
It creates an ability to present viewer with two slightly different images
One for the left eye and one for the right eye
Auto-stereoscopic display is being used
HALOGRAPHIC TV
Image project outward from TV as they appear to float in
mid-air.One could walk around a specific object and look it from behind or can put himself in middle of the action.
References :-
en.wikipedia.org/wiki/Plasma_(physics)
www.howstuffworks.com ... Television TV Technology
en.wikipedia.org/wiki/LED-backlit_LCD_display
www.slideshare.net/Firedemon13/plasma-8164874 - United States
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