Final

PRESENTED BY:-SUMIT SHEKHAR (EC)SOURABH GHODKI (EC) SWAPNIL TEKADE (EC)SHUBHAM GUPTA (EC)

FROM:- TECHNOCHRATS INSTITUTE OFTECHNOLOGY (EXCELLENCE)

April 7, 2023IETE PPT 2

NEW Vs OLD TECHNOLOGY DISPLAY DEVICES

CRT is cheap, versatile & high quality imaging device that has governed technology for years. BUT

This has disadvantages like they are bulky, voltage-hungry, limited screen resolution and emit electromagnetic radiations.

New technology display devices overcome these drawbacks.


ANALOG Vs DIGITAL TV ANALOG Vs DIGITAL TV

In the basic analogue TV, the signal are transmitted as continuously varying radio waves ( Video in AM & Audio in

FM ). Therefore the analogue TV is subject to noise, interference, and attenuation with distance. Also analogue

TV signals require wide Band-Width for audio & video signals, which restricts the resolution & overall quality of the

image.

The digital TV is transmitted as a series of 0’s & 1’s. Computer compressing is possible & therefore fraction of BW

is required.

As the signal is basically ‘ON’ or ‘OFF’, the viewer either sees an image or nothing at all. There is no signal loss due

to attenuation.


TV VIEWING HAS UNDERGONE VARIOUS UPGRADATION IN YEARS1.CRT BASED2.LCD BASED3.LED BASED4.PLASMA BASED5.FED BASED6.SED BASED


COMPARISON OF DIFFERENT

DISPLAYS


LCD Vs LED

LCD has liquid crystals between the display panels of TV, which get activated when an electric current is supplied. It uses CCFL for back lighting.

In case of LED the principle of working is same as that of LCD but for back lighting LEDs’ are used.

- Use of LED as light source makes LED TV slimmer than LCD.

-LED TV has higher brightness than LCD TV.

LED TV COST APPROX DOUBLE THAN LCD or PLASMA

LCD Vs LED

LCD has liquid crystals between the display panels of TV, which get activated when an electric current is supplied. It uses CCFL for back lighting.

In case of LED the principle of working is same as that of LCD but for back lighting LEDs’ are used.

- Use of LED as light source makes LED TV slimmer than LCD.

-LED TV has higher brightness than LCD TV.

LED TV COST APPROX DOUBLE THAN LCD or PLASMA


PLASMA TV WORKING

PLASMA TV works on a principle that gas discharge releases electrons, which hit the RGB colour dots to create different colours.


- ADVANTAGES & DISADVANTAGES OF PLASMA TV OVER LCD TV

- ADVANTAGES :-1. PLASMA TV has VIEWING ANGLE of 178 degrees whereas LCD has

viewing of just 45 degrees.2. VIEWING DISTANCE for a 42” PLASMA TV is 1.7 m as against 4.6 m for

LCD TV.3. CONTRAST RATIO is 2,000,000:1 for PLASMA as against 150,000:1 for

LCD TV.4. LIFE is 100,000 hours for PLASMA against LCD which has 60,000 hours

life.5. Are slightly CHEAPER than LCD TV.

- DISADVANTAGES: 1. PLASMA TV HEAT UP.2. Have DULL COLOURS.3. Consumes MORE POWER than LCD TV4. Not available in sizes less than 42”. 1 FEB 2012

IETE PPT 9

CHOICE VARY DEPENDING ON THE PRIORTISATION BETWEEN VARIOUS CRITERIA LIKE :-

1. CONTRAST RATIO2. POWER CONSUMPTION3. ECO-FRIENDLINESS4. SCREEN SIZE5. THINNESS6. COST7. VIEWING ANGLE etc.

HDTV

HIGH DEFINATION TELEVISION

1 FEB 2012IETE PPT 11

HDTV - HIGH DEFINATION TVHDTV - HIGH DEFINATION TV

Currently HDTV broadcast does not take place in India. Doordarshan did broadcast Commonwealth Games on HDTV, this year.

There are 2 modes of transmission – DIGITAL & ANALOG. DIGITAL – 1. Standard 2. Enhanced 3. HD format

1. Standard – Resolution of 480 i2. Enhanced – Resolution of 480 p3. High Def. – 720 p, 1080 i & 1080 p

High Definition has highest level of resolution. HD is Digital, but all Digital are not High Definition. HDTV has aspect ratio of 16 : 9 (same as movie theatre screen)


INTRODUCTIONINTRODUCTION

HD resolution is listed in 2 different formats.

1. No. of Lines + Type of Scan.

2. No. of pixels ( Vertical by Horizontal )

e.g. (a) 720p OR 720 X 1280 – 720 lines,progressive scanned

(b) 1080i OR 1080 X 1920 – 1080 lines, interlaced scanned

(c) 1080p OR 1080 X 1920 – 1080 lines,progressive scanned

720p & 1080i are virtually equal in overall resolution

While, 1080p is the best.1080p is the best.

HDTV provides cinematic experience with Dolby Digital surround Sound

Higher the no. of lines on TV – greater is the detail in the imageHigher the no. of lines on TV – greater is the detail in the image


ISSUES WITH HDTVISSUES WITH HDTV

To be able to receive HD content, it is required to have :

HD-Ready TV Set or TV set with built-in HDTV Tuner

HDTV transmission provided through satellite, and same may not be available on free basis.

While on analogue TV, the interference causes the picture to slowly deteriorate from bad to worse, whereas in HDTV it will freeze, skip or display ‘garbage’ information.

Operators do not follow HDTV specs -- using slower bitrates or lower resolutions to accommodate more channels within the limited BW, and thus reduces the video quality.


3D 3D TELEVISIONTELEVISION


For life-like experience of movies, sports

and games and above all you have enough money to spend buy a 3-D TV.

3-D technology is available in all LCD – LED and PLASMA TV.

3-D TVs show 3-D picture only if the content is recorded in 3-D.

3-D TV at present cost approx 100 to 125 % more than the normal 2-D TVs.

There is problem of eyestrain and headache due to glasses worn. Glass-free 3-D is still few years away which will address these issues.


•For viewing a 3-D content 3-D glasses based on red-blue polarization are required. In this the right eye see image through a blue filter and left eye see slightly different image from a different angle through a red filter. The brain put these two images together as it normally does and hence a 3-D sensation is delivered. •Now instead of these polarised glasses; glasses with shutter action are used, which are costly. In this the shutter speed is synchronized in a such a way that the right eye sees the image meant for the right eye only, and the left eye sees the images meant for the left eye only.


SURFACE - CONDUCTION ELECTRON-EMITTER

DISPLAY


S E D S E D


SED technology works much the

same way as conventional CRT,

except that instead of one large

electron gun firing at all the

screen phosphors that light to

display the image, SED has thousands of tiny electron

guns known as 'emitters' for each

phosphor sub-pixel. So it takes 3

emitters to create one pixel and

over 6 million emitters to produce a high defination

image.

S E D TECHNOLOGYS E D TECHNOLOGY

COMPARISION OF

DIFFERENT FORM WITH

SED April 7, 2023IETE PPT 20

1. SED is FLAT2. CRT’s are as wide as deep3. SED can be made as large as

required.4. Linearity at side is a non-

issue in SED


SED Vs CRTSED Vs CRTSED Vs CRTSED Vs CRT

SED uses half the power as

compared to CRT

In SED black details are better

High brightness & high

definition in SED

Production process is cheaper1 FEB 2012

IETE PPT 22

S E D Vs PLASMAS E D Vs PLASMA

LCD HAVE LIMITED ANGLE OF VIEW, BECAUSE OF HIGHLY DIRECTIONAL LIGHT.

LCD ARE NOT SUSCEPTIBLE TO BURN-IN

SED USES 2/3rd THE POWER OF LCD


S E D Vs L C DS E D Vs L C D

We think , now you all are aware of the new age technology in TV Receiver .

Do you plan to have the LED/LCD/PLASMA TV IN DIGITAL OR HDTV shortly OR WISH TO GO IN FOR 3-D TV.

CHOICE IS YOURS.

We think , now you all are aware of the new age technology in TV Receiver .

Do you plan to have the LED/LCD/PLASMA TV IN DIGITAL OR HDTV shortly OR WISH TO GO IN FOR 3-D TV.

CHOICE IS YOURS.1 FEB 2012

IETE PPT 24

THANK YOU


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