entertainment and security electronics technology

7/24/2019 Entertainment and Security Electronics Technology

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TELEVISION


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PIXEL


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LCD TV

Operate based on the unique properties of liquid

crstals!

Liquid crstals are clindrical "olecules that possess

characteristics of liquids as #ell as solid crstals! $hen ras of li%ht pass throu%h liquid crstal

"olecules& the "olecules be%in to t#ist!

'n electrical current can be used to unt#ist the"& and

this unt#istin% bloc(s the li%ht ras! ) controllin% the electrical current& the intensit of

the li%ht can also be controlled!


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Consist of t#o pieces of polari*ed %lass

Second piece of %lass #ith the polarizing film

at a right angleto the first piece!

' liquid crstal solution is contained bet#een thet#o substrates!

' current passes throu%h the solution& causin%

so"e "olecules to unt#ist! +i%h ,olta%es correspond to dar( displas #hile

lo#er ,olta%es correspond to bri%ht displas!


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-. LED TV

The LED TV is a "ore ad,anced ,ersion of

the LCD TV! $hile both tpes of TV on LCD

technolo% and ha,e flat/panel desi%ns!

0LED TVs are sli""er& bri%hter& and "oredetailed than our traditional LCD TV!1

LED TVs function b illu"inatin% LCD panels

#ith LED bac(li%htin%! +o#e,er& not all LED TVs utili*e the sa"e

tpe of LED bac(li%htin%!


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' LCD screen is co"posed of 2 parts& the

actual liquid crstal displa and a li%ht

source at the bac( of the screen 3calledbac(li%ht.!

' li%ht diffuser is placed bet#een the

bac(li%ht and the LCD screen to unifor"the source of li%ht equall across the

screen!

LCD stands for 1liquid crstal displa4 andtechnicall& both LED and LCD TVs are

liquid crstal displas!


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PL'S5' TV

The are called 0plas"a0 displas because the

use s"all cells containin% electricall

char%ed ioni*ed %ases& #hich are plas"as!

$or(s on -thstate of "atter (no#n as plas"a ' plas"a can be created b heatin% a %as or

sub6ectin% it to a stron% electro"a%netic field

applied #ith a laser or "icro#a,e %enerator! This

decreases or increases the nu"ber of electrons&

creatin% positi,e or ne%ati,e char%ed particles

called ions!


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WHAT HAPPENS?

'ddresselectrode

causes %as

chan%e to

plas"a state!

7as in plas"astate reacts

#ith phosphors

in dischar%e

re%ion

8eaction causeseach sub/pi9el to

produce red&

%reen& and blue

li%ht!


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+DTV

High-definition television3HDTV. pro,ides a resolution that

is substantiall hi%her than that of standard/definition

tele,ision!

+DTV is a di%ital TV broadcastin% for"at #here the broadcast

trans"its #idescreen pictures #ith "ore detail and qualitthan found in a standard analo% tele,ision!

+DTV is a tpe of Di%ital Tele,ision 3DTV. broadcast& and is

considered to be the best qualit DTV for"at a,ailable!

Tpes of +DTV displas include direct/,ie#& plas"a&rearscreen& and front screen pro6ection!

+DTV requires an +DTV tuner to ,ie# and the "ost detailed

+DTV for"at is :;


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Aspet ratio/ Standard tele,ision has a -=> aspect ratio

// it is four units #ide b three units hi%h! +DTV has a

:?=@ aspect ratio& "ore li(e a "o,ie screen!

!esol"tion/ The lo#est standard resolution 3SDTV. #ill

be about the sa"e as analo% TV and #ill %o up to A;- 9

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