PLASMA TELEVISION Name: Rajput Urvashi A Enrollment No: Branch : Electronic and Communication Audio and video system 1

Content  Abstract  What is plasma TV?  Plasma display  General characteristics  Native plasma television resolution.  How plasma display work!?  Environmental impact.  Advantages  Disadvantages  References 2

What is Plasma TV?  A television set with a plasma screen, usually larger and much thinner than a conventional set, and often designed to be,mounted on a wall… 3

Plasma Display  A plasma display panel (PDP) is a type of flat panel display common to large TV display 30 inches(76cm) or larger.  They are called “plasma” displays because they uses small cells containing electrically charged ionized gases, which are plasmas. 4

General Characteristics  Plasma displays are bright (1,000 lux or higher for the module), have a wide color gamut, and can be produced in fairly large sizes- up to 3.8 meters (150 in) diagonally.  Typical power consumption is 400watts for 127 cm (50 in) screen  The life time of latest generation of plasma displays is estimated at 100,000 hrs of actual display time, or 27 yrs at 10 hrs per day.  This is estimated time over which maximum picture brightness degrades to half the original value. 5

 Plasma screen are made out of glass. This may causes glare from reflected objects in the viewing area.  Companies such as Panasonic coat their newer plasma screens with an anti-glare filter material. 6

Native plasma television resolution  Fixed- pixel displays such as plasma TVs scale the video image of each incoming signals to the native resolution of the display panel.  The most common native resolutions for plasma display panels are 853x48  As, a result picture quality varies depending on the performance of the video scaling processor and the up scaling and down scaling algorithms used by each display manufacturer. 7

How plasma display works?  Ionized gases such as the ones shown here are confined to millions of tiny individual compartments across the face of plasma display, to collectively form a visual image.  A panel typically compromises millions of tiny compartments in between two panels o glass. These cells hold a mixture of noble gases and a minuscule amount of another gases (e.g., mercury vapor). 8

 When a high voltage is applied across the cell, the gas n the cells form a plasma. With flow of electricity(electrons),some of the electrons strike mercury particles as the electrons move through the plasma,  Mercury sheds the energy as UV photons  Then UV photons strikes phosphor that is painted on the side of the cell.  Each pixel in the plasma display is made up of the three cells comprising the primary colors of visible light.  Varying the voltages of the signals to the cells allow different colors. 9

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 The collisions of the flowing electrons in the plasma with the inert gas atoms leads to the light emission; such light-emitting plasma are known as glow discharge.  Every pixel is made up of three separate sub pixels cells, each with different colored phosphors. One sub pixels has a red light phosphor and one green light phosphor and has a blue light phosphor. These color blend together crate overall color of pixel, the same as CRT.  Plasma display use pulse width modulation (PWM) to control brightness; 11

Environmental impact  Plasma screens have been lagging behind CRT and LCD screens in terms of energy consumption efficiency.  To reduce the energy consumption,new technologies are also being found.  A growing problem is that the people tend to keep their old TVs running and an increasing trend to escalating screen sizes. 12

Advantages  Wider viewing angles than those of LCD;  Less visible motion blur and faster response time  Less expensive for the buyer per square inch than LCD, particualry when equivalent performance is considered.  Superior uniformity 13

Disadvantages  Reduces the effect of burn-in but does not prevent it  Plasma display have some shimmering or flickering effect with a number of hues,  The screen size larger than 127(50 in) the effect is more visible at shorter distances.  Uses more electrical power compare to LCD TV  Does not work at high altitudes above 2Kms due to pressure differential between the gases inside the screen and the air pressure at altitude..may cause buzzing sound.  Heavier than LCD TV 14

References  Afterdawn.com- plasma Display  Plasma televisions.org  Google books – principles of multimedia by Ranjan Parekh,  R.R.Gulati 15