Electronic Displays

JAR 66 CATEGORY B1 CONVERSION COURSE

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MODULE 5.11 ELECTRONIC

MODULE 5 DIGITAL TECHNIQUES ELECTRONIC INSTRUMENT SYSTEMS

1

ELECTRONIC DISPLAYS

1.1

GENERAL

DISPLAYS

With the intr!"#tin $ !i%it&' (i%n&')*r#e((in% te#hn'%+, it h&( -e#.e *((i-'e $r !r&(ti# #h&n%e( t -th /"&ntit&ti0e &n! /"&'it&ti0e !&t& !i(*'&+ .eth!( Thi( te#hn'%+ h&( en&-'e! the (i.*'i$i#&tin $ .&n+ $'i%ht !e#2) in(tr".ent '&+"t(, &''3in% the re*'&#e.ent $ #.*'e4 &n&'%"e in(tr".ent( 3ith (t&te $ the &rt !i%it&' in(tr".ent&tin Thi( G'&(( C#2*it #n#e*t h&( &''3e! .&n+ in(tr".ent( t -e re*'&#e! -+ ne TV t+*e !i(*'&+ th&t #&n !i(*'&+ & '&r%e &n! 0&rie! r&n%e $ in$r.&tin &( re/"ire! There &re three !i$$erent .eth!( $r !i(*'&+in% !i%it&' !&t&, the(e &re

1.2

1

Li%ht)E.ittin% Di!e( 7LED8

9

Li/"i! Cr+(t&' Di(*'&+ 7LCD8

:

C&th!e R&+ T"-e 7CRT8

DISPLAY CONFIGURATIONS

Di(*'&+( $ LED LCD t+*e(0&'"e( &re "("&''+ 'i.ite!&n! t the in 3hi#h (in%'e re%i(ter $ &n! &'*h&n".eri# i( re/"ire!, &re&**'i#&tin -&(e! n the (e0en& (e%.ent r the !t .&tri4 #n$i%"r&tin CRT t+*e !i(*'&+( h&0e & 3i!er "(e &n! #&n !i(*'&+ n&0i%&tin, en%ine *er$r.&n#e &n! (+(te. (t&t"( in$r.&tin T&-'e 1 (h3( the !i$$erent &**'i#&tin( $r e'e#trni# !i(*'&+(

Di(*'&+T+*e Li%ht)E.ittin% Di!e Li/"i! Cr+(t&' Di(*'&+

C&th!e R&+ T"-e

A**'i#&tin Di%it&' #"nter !i(*'&+( $ en%ine *er$r.&n#e Mnitrin% in!i#&tr(; R&!i $re/"en#+ (e'e#tr in!i#&tr(; Di(t&n#e Me&("rin% in!i#&tr(; Cntr' !i(*'&+ "nit( $ Inerti&' N&0i%&tin S+(te.(, et# We&ther r&!&r in!i#&tr(; !i(*'&+ $ n&0i%&tin&' !&t&; en%ine *er$r.&n#e !&t&; (+(te. (t&t"(;

E'e#trni# Di(*'&+ A**'i#&tin( T&-'e1

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DISPLAYS

LED DISPLAYS

CRT DISPLAYS

LCD DISPLAYS

BAe 1=6 E'e#trni# In(tr".ent L&+"t

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DISPLAYS

1.2.1 SEGMENT DISPLAYS

Se0en)(e%.ent #n$i%"r&tin 3i'' &''3 the !i(*'&+ $ !e#i.&' n".-er( >)?; it &'( h&( the #&*&-i'it+ t !i(*'&+ #ert&in &'*h&-eti# #h&r&#ter( T !i(*'&+ &'' &'*h&-eti# #h&r&#ter( re/"ire( &n in#re&(e in the n".-er $ (e%.ent( $r. (e0en t thirteen, &n! in (.e #&(e( (i4teen (e%.ent(
SEVEN)SEGMENT CON
THIRTEEN)SEGMENT CON
Se0en &n! Thirteen Se%.ent Di(*'&+ <r.&t(
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DISPLAYS

In the !t .&tri4 !i(*'&+ the *&ttern( %ener&te! $r e&#h in!i0i!"&' #h&r&#ter i( .&!e "* $ & (*e#i$i# n".-er $ i''".in&te! !t( &rr&n%e! in #'".n( &n! r3(
 ROWS

= COLUMNS

Dt M&tri4 Cn$i%"r&tin
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DISPLAYS

LIGHT-EMITTING DIODE (LEDS)

One $ the .(t #..n 'i%ht ("r#e( "(e! in e'e#trni#( i( the Li%ht E.ittin% Di!e 7LED8 A LED i( & t3 ter.in&' (e.i#n!"#tr !e0i#e #.*ri(in% & *)n "n#tin, 3hi#h #n!"#t( in ne !ire#tin n'+ Thi( (e.i#n!"#tr .&teri&' e.it( 'i%ht 3hen the *)n "n#tin i( $r3&r! -i&(e! &n! & #"rrent i( $'3in% thr"%h it LED( #&n -e .&n"$&#t"re! t e.it 0i(i-'e r in0i(i-'e 7in$r&)re!8 'i%ht Vi(i-'e LED( &re $ten "(e! &( in!i#&tr( in e'e#trni# e/"i*.ent either (in%'+, $r in!i#&tin% *3er nF $r in(t&n#e, r in &rr&+( $r &'*h&n".eri# !i(*'&+( LED( &re re'i&-'e &n! h&0e & 0er+ 'n% 'i$e i$ tre&te! #&re$"''+ Li%ht e.i((in in !i$$erent #'"r( $ the (*e#tr". #&n, 3hen re/"ire!, -e -t&ine! -+ 0&r+in% the *r*rtin( $ the e'e.ent( #.*ri(in% the #hi*, &n! &'( -+ & te#hni/"e $ !*in% 3ith ther e'e.ent(, ie nitr%en C"rrent #n(".*tin 7t+*i#&''+ &-"t 5  9> .A8 %ener&''+ 'i.it( the "(e$"'ne(( $ & LED t e/"i*.ent th&t i( nt -&tter+ *3ere! 1.3.1 OPERATION

The *hen.enn 3hi#h re("'t( in the e.i((in $ 'i%ht $r. & LED i( #&''e! E'e#tr'".ine(#en#e, r Ine#tin L".ine(#en#e, &n! i( !"e t the h'ee'e#trn re#.-in&tin( th&t t&2e *'&#e ne&r & $r3&r! -i&(e! *)n "n#tin When e'e#trn( &re ine#te! int the n re%in $ & *)n !i!e &n! &re (3e*t thr"%h the re%in ne&r the "n#tin, the+ re#.-ine 3ith h'e( in the re%in Thi( %ener&te( e'e#tr.&%neti# 3&0e( $ & $re/"en#+ !eter.ine! -+ the !i$$eren#e in the ener%+ 'e0e'( $ the e'e#trn &n! the h'e In r!er $r thi( re#.-in&tin t re("'t in '".ine(#en#e, there ."(t -e & net #h&n%e in the ener%+ 'e0e'(, &n! the *rtn %ener&te! ."(t nt -e re#&*t"re! in the .&teri&'

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BIAS

DISPLAYS

RECOMBINATIONS

p JUNCTION

n INJECTED ELECTRONS

CONTACT

LED O*er&tin

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DISPLAYS

LED

CHIP

ANODE

Li%ht)E.ittin% Di!e 7LED8
CATHODE

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DISPLAYS

In & t+*i#&' (e0en)(e%.ent !i(*'&+ $r.&t it i( "("&' t e.*'+ ne LED *er (e%.ent &n! ."nt it 3ithin & re$'e#ti0e #&0it+ 3ith & *'&(ti# 0er'&+ &n! & !i$$"(er *'&te The (e%.ent( &re $r.e! &( & (e&'e! inte%r&te! #ir#"it * The #nne#tin% *in( $ the LED( &re ('!ere! t &n &((#i&te! *rinte! #ir#"it -&r! De*en!in% n the &**'i#&tin &n! the n".-er $ !i%it( #.*ri(in% the &**r*ri&te /"&ntit&ti0e !i(*'&+, the+ 3i'' "(e either in!e*en!ent !i%it *(, r #.-ine! ."'ti*'e !i%it *( .&+ -e "(e!
REFLECTIVE CAVITIES

DIFFUSER PLATE

LED's

EFFECTIVE SEGMENT HEIGHT

CIRCUIT OARD

DIGIT PAC! PLASTIC OVERLAY

LED Di%it 
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DISPLAYS

@ ? #n$i%"r&tin
DOT MATRI LED DISPLAY ENGINE SPEED

2" "

#"

ANALOGUE ENGINE SPEED INDICATOR

$"

N1 & RPM

%" 1""

Smith's

En%ine S*ee! In!i#&tr

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DISPLAYS

>, 3hi#h h&( -th LED &n! !t .&tri4, !i(*'&+(

MAN SET

& RPM 12 1"

"

9

%

$

6 5

12 2

1"

N

#

%

#   MATRI DISPLAY

"

9

6 2 5#

$

1

*C

J 

=

= EGT

J 

& RPM

LED DISPLAY

1>> 5=

1>> 5=

N 2

'1"""

$ 

"

9

9 1

#

3

PULL TO SET N1

$ 1



2

#

FF+FU

9

9 1 3

" 1

2

!GPH+!G

PUSH

FUEL USED

RESET FUEL USED

PULL TO SET N1

Bein% :)=>> 3er '&nt In(tr".ent Gr"*
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DISPLAYS

LI,UID CRYSTAL DISPLAY (LCD)

Li/"i! Cr+(t&' Di(*'&+( 7LCD8 &re nt &#t"&''+ 'i%ht ("r#e( ) the+ %ener&te n 'i%ht, .ere'+ $i'terin% in#i!ent 'i%ht, in & #ntr''e! .&nner The LCD( (een in 3&t#he(, #'#2( &n! #&'#"'&tr( et#, &'' 3r2 -+ the (&.e *rin#i*'e T3 tr&n(*&rent -"t #n!"#ti0e *'&te( (&n!3i#h & '&+er $ 'i/"i! #r+(t&'(, 3hi#h nr.&''+ &'' $&#e in the (&.e !ire#tin See
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DISPLAYS

INCIDENT LIGHT

RE
TRANSARENT CONDUCTIVE LATES

INCIDENT LIGHT RE
TRANSARENT

LED O*er&tin
OAQUE


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DISPLAYS

(h3( the (tr"#t"re $ & (e0en)(e%.ent LCD

LIQUID CRYSTAL LAYER 7TYICAL SACING  1> MICRONS8

SEVEN SEGMENT ELECTRODE

MIRROR IMAGE 7NOT SEGMENTED8

BACK LATE

SEGMENT CONTACTS COMMON RETURN CONTACT

Se0en)Se%.ent LCD The (*&#e -et3een the *'&te( i( $i''e! 3ith & 'i/"i! #r+(t&' #.*"n!, &n! the #.*'ete &((e.-'+ i( her.eti#&''+ (e&'e! 3ith & (*e#i&' ther.*'&(ti# .&teri&' t *re0ent #nt&.in&tin When & '3)0't&%e, '3)#"rrent (i%n&' i( &**'ie! t the (e%.ent(, the *'&ri(&tin $ the #.*"n! i( #h&n%e! t%ether 3ith & #h&n%e in it( *ti#&' &**e&r&n#e $r. tr&n(*&rent t re$'e#ti0e The .&%nit"!e $ the *ti#&' #h&n%e i( -&(i#&''+ & .e&("re $ the 'i%ht re$'e#te! $r., r tr&n(.itte! thr"%h, the (e%.ent &re& t the 'i%ht re$'e#te! $r. the -%r"n! &re& Th"(, "n'i2e & LED, it !e( nt e.it 'i%ht, -"t .ere'+ &#t( n 'i%ht *&((in% thr"%h it De*en!in% n the *'&ri(&tin $i'. rient&tin, &n! 3hether the !i(*'&+ i( re$'e#ti0e r tr&n(.i((i0e, the (e%.ent .&+ &**e&r !&r2 n & 'i%ht -%r"n! 7("#h &( in !i%it&' 3&t#he( &n! *#2et #&'#"'&tr(8 r 'i%ht n & !&r2 -%r"n!

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DISPLAYS

LO- VOLTAGE PO-ER SUPPLY TO EACH SEGMENT

1

1

2

"

" 1

CD TO (

"

SEGMENT

"

#

1 DECODER

1

%

"

" "

BCD  Se0en)Se%.ent !e#!er

uk engineering 1.



DISPLAYS

CATHODE RAY TUE (CRT)

Di(*'&+( $ thi( t+*e, 3hi#h &re -&(e! n the e'e#trn -e&. (#&nnin% te#hni/"e, h&0e -een "(e! in &ir#r&$t $r .&n+ +e&r( The+ 3ere $ir(t "(e! t !i(*'&+ 3e&ther r&!&r in$r.&tin &n! h&0e #ntin"e! t -e &n e((enti&' *&rt $ the A0ini#(
GRAHITE COATING 7COLLECTS SECONDARY ELECTRONS TO REVENT SCREEN BECOMING NEGATIVELY CHARGED8

DE
ANODE

HEATER

GRID

GLASS ENVELOE

ELECTRON BEAM

ERMANENT MAGNETS 7BEAM
SCREEN

C&th!e R&+ T"-e CRT Cr(()Se#tin
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DISPLAYS

1..1 ELECTRON GUN

The e'e#trn %"n #n(i(t( $ the $''3in% 1 C&th!e An in!ire#t'+ he&te! #&th!e 7ne%&ti0e'+ -i&(e! 3rt the (#reen8 9 Gri!

A #+'in!ri#&' %ri! ("rr"n!in% the #&th!e

: An!e

T3 7(.eti.e( three8 &n!e(

The #&th!e i( & t"-e $ .et&' #'(e! &t ne en!, 3ith & #&tin% $ .&teri&' th&t 3i'' e.it e'e#trn( 3hen he&te!, #0erin% the #'(e! en! T *er&te the #&th!e nee!( t -e he&te!; thi( i( &#hie0e! "(in% & #i' $ in("'&te! 3ire #nne#te! t the #&th!e Be#&"(e the (#reen $ the CRT #nt&in( #n!"#tin% .&teri&' &t & hi%h 0't&%e 75 ) 152V8, e'e#trn( 3i'' -e &ttr&#te! &3&+ $r. the #&th!e The $ree e'e#trn( h&0e t *&(( thr"%h & *inh'e in & .et&' *'&te 7Cntr' Gri!8 A'terin% the 0't&%e $ the %ri! #&n #ntr' the .0e.ent $ the e'e#trn( thr"%h thi( h'e The 0't&%e $ the %ri! i( &'3&+( ne%&ti0e 3rt C&th!e The $ree e'e#trn( &re then $r.e! int & -e&. -+ the &#tin $ the $ir(t &n!e The &n!e i( $ & #+'in!ri#&' (h&*e &n! -+ &!"(tin% the 0't&%e n the &n!e, the -e&. #&n -e .&!e t #.e t & (.&'' *int &t the (#reen en! $ the CRT The (#reen en! $ the CRT i( #&te! 3ith & .&teri&' #&''e! & h(*hr, 3hi#h 3i'' %'3 3hen (tr"#2 -+ e'e#trn( The *h(*hr i( "("&''+ #&te! 3ith & thin $i'. $ &'".in". ( th&t it #&n -e #nne#te! t the $in&' &##e'er&tin% 7&n!e8 0't&%e The 3h'e t"-e i( $r.e! &( & 0&#"".


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DISPLAYS

CONNECTED TO CONDUCTIVE COATING ON GLASS

CATHODE GRID

SECOND ANODE

HEATER

>V

)5>V

:>>V

CRT V't&%e(
5 2V


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DISPLAYS

Thi( &rr&n%e.ent 3i'' *r!"#e & *int $ 'i%ht &t the #entre $ the (#reen, -"t t .&2e the CRT "(e$"' $r !i(*'&+in% !&t&, thi( -e&. $ e'e#trn( ."(t -e &-'e t -e .0e! &r"n! the (#reen <r thi(, t3 (et( $ .et&' *'&te( &re "(e! &n! i$ & 0't&%e i( *&((e! thr"%h the., then the -e&. 3i'' !e$'e#t n the (#reen The(e *'&te( &re #&''e! De$'e#tin '&te( The(e *'&te( &re &rr&n%e! &t ri%ht &n%'e( t e&#h ther The -e&. #&n -e !e$'e#te! i$ & 0't&%e i( &**'ie! t the(e *'&te(; thi( i( #&''e! E'e#tr(t&ti# !e$'e#tin M0e.ent $ the -e&. 'e$tri%ht i( #ntr''e! -+ the @ '&te(, 3ith the Y '&te( #ntr''in% .0e.ent "*!3n
Y DE
ANODE

@ DE
@ &n! Y De$'e#tin '&te(

uk engineering



DISPLAYS

The ther .eth! "(e! $r !e$'e#tin i( E'e#tr.&%neti# Thi( .eth! i( "(e! $r TV, #.*"ter .nitr( &n! .(t &ir#r&$t CRT !i(*'&+( A( &n e'e#trn .0e(, it #n(tit"te( &n e'e#tri# #"rrent, &n! ( & .&%neti# $ie'! 3i'' e4i(t &r"n! it in the (&.e 3&+ &( & $ie'! &r"n! & #"rrent)#&rr+in% #n!"#tr In the (&.e 3&+ th&t & #n!"#tr 3i'' e4*erien#e & !e$'e#tin% $r#e 3hen *'&#e! in & *er.&nent .&%neti# $ie'!, ( &n e'e#trn -e&. #&n -e $r#e! t .0e 3hen ("-e#te! t e'e#tr.&%neti# $ie'!( &#tin% &#r(( the (*&#e 3ithin the t"-e Ci'( &re there$re *r0i!e! &r"n! the ne#2 $ the t"-e, &n! &re #n$i%"re! ( th&t $ie'!( &re *r!"#e! hrint&''+ 7Y)&4i( $ie'!8 &n! 0erti#&''+ 7@)&4i( $ie'!8 The #i'( &re #nne#te! t the (i%n&' ("r#e( 3h(e 0&ri&-'e( &re t -e !i(*'&+e! The e'e#trn -e&. #&n -e !e$'e#te! t the 'e$t r ri%ht, "* r !3n r &'n% & re("'t&nt !ire#tin !e*en!in% n the *'&ritie( *r!"#e! -+ the #i'(, &n! n 3hether ne &'ne i( ener%i(e!, r -th &re ener%i(e! (i."'t&ne"('+
MAGNETIC
N NECK O< THE TUBE

S

ELECTRON BEAM COMING OUT O< THE AER

S

VERTICALLY DISOSED MAGNETIC COIL RODUCES HORIONTAL DE
N

HORIONTALLY DISOSED MAGNETIC COIL RODUCES VERTICAL DE
E'e#tr.&%neti# De$'e#tin
RESULTANT DE
uk engineering




DISPLAYS

The most common form of deflection for CRT is a “Linear Sweep”. This means that the beam is taken across the screen at a steady rate from one edge to the other, and is then retrned !ery rapidly "an action called “#ly $ack”%. To generate sch a linear sweep in electrostatic deflection, a Saw&tooth 'a!eform is sed. . #igre () shows a Saw&tooth 'a!eform.

CURRENT

RAM OR SWEE

TIME

S&3)tth W&0e$r.
uk engineering


ELECTRONIC


MA' IDEAL CURRENT

" MA'

VOLTAGE

"

ACROSS R

MA' VOLTAGE ACROSS L

MODULE 5.11

"

MA' RESULTANT TRAPE.OIDAL VOLTAGE

"

S#&n Ci' Gr&*h(
DISPLAYS

uk engineering 1.$




DISPLAYS

COLOUR CRT DISPLAYS

*nformation from 'eather Radar systems is re+ired to be displayed in color to enable the ser to see a clear representation of the weather condition ahead. To do this we re+ire the display to be drawn in color. 'eather Radar data is presented in the following colors (.

Le!el-&

$lack

&

ostorm.

/.

Le!el( &

0reen

&

1oderatestorm.

2.

Le!el/ &

3ellow &

4.

Le!el2 &

Lessse!erestorm.

Red

&

Se!erestorm.

#igre (5 shows a display of “'eather Radar” data.

We&ther R&!&r D&t& YELLO-

GREEN

RED

uk engineering




DISPLAYS

1.$.1 SCREEN FORMAT

T !i(*'&+ the 3e&ther !&t& n the CRT, the (#reen i( !i0i!e! int t3 h&'0e( re*re(entin% the t3 /"&!r&nt( in the #)r!in&te (+(te. The ri%in i( &t the -tt. #entre, ( th&t 0&'"e( $ @ &re ne%&ti0e t the 'e$t &n! *(iti0e t the ri%ht A'' 0&'"e( $ Y 3i'' -e *(iti0e The (#reen i( (#&nne! in 956 hrint&' 'ine(, 3ith 956 -it( $ !&t& in e&#h 'ine E&#h 'ine i( '#&te! -+ the 0&'"e $ Y &n! e&#h -it -+ & 0&'"e $ @ The (#reen i( there$re & 956 @ 956 .&tri4 The !&t& $r. the 3e&ther r&!&r (+(te. i( #n0erte! int !i%it&' $r. &n! i( ("**'ie! t the !i(*'&+ n t3 !&t& 'ine( Thi( !&t& re*re(ent( the 3e&ther 'e0e'(; 1, 9, : r =, &t the re'&ti0e r&n%e Thi( !&t& i( (tre! in .e.rie( 3ithin the !i(*'&+ &n! i( "*!&te! 3ith e&#h (#&n $ the r&!&r (+(te. The @ &n! Y 0&'"e( &re "(e! t &!!re(( the .e.r+ &n! !i(*'&+ the in$r.&tin (tre! there &t the &**r*ri&te ti.e ie &( the (#&n ##"r( E&#h *&rt $ the .e.r+ #nt&in( ne &!!re(( $r e0er+ -it n e0er+ 'ine in the !i(*'&+ E&#h .e.r+, there$re i( &'( & 956 @ 956 .&tri4 Thi( 3i'' &''3 the entire 3e&ther !i(*'&+ t -e (tre! #ntin""('+ A( the (#reen i( (#&nne!, the .e.r+ i( &!!re((e! &t e&#h *int n e&#h 'ine -+ t3 #"nter( & hrint&' r @ #"nter $r &!!re((in% the r3( in the .e.r+, &n! & 0erti#&' r Y #"nter $r &!!re((in% the #'".n( The @ #"nter (t&rt( n the 'e$t &t n".-er 196, #"ntin% !3n t > then "* t 196 7@ (#&nnin% i( ne%&ti0e*(iti0e !e*en!in% n 3hi#h (i!e $ the (#reen the !&t& i( t -e !i(*'&+e!8 The Y #"nter #"nt( $r. >  955


uk engineering



DISPLAYS

HORIONTAL SWEE WAVE
(/) /66

IMAGE DISLAY AREA

 E E M WR 8 S O S L < . A E > 9 C 7 I V T A R W E V

Y +

-

-

+ >

@

CRT S#reen <r.&t

uk engineering 1.



DISPLAYS

COLOUR GE NERATION

A #'"r CRT h&( three e'e#trn %"n(, e&#h $ 3hi#h #&n !ire#t &n e'e#trn -e&. &t the (#reen The (#reen i( #&te! 3ith three !i$$erent 2in!( $ *h(*hr .&teri&' On -ein% -.-&r!e! -+ e'e#trn -e&.(, the *h(*hr( '".ine(#e in e&#h $ the three *ri.&r+ #'"r( Re!, Green &n! B'"e The (#reen i( !i0i!e! int & '&r%e n".-er $ (.&'' &re&( r !t(, e&#h $ 3hi#h #nt&in( & *h(*hr $ e&#h 2in! &n! 91 (h3 & #'"r CRT

R B G BLU E

MASK AERTURE

R G

GREEN

B

RED

SHADOW MASK

C'"r CRT

HOSHOR DOT SCREEN

uk engineering




DISPLAYS

ELECTRON GUN ASSEMLY (RED/ GREEN 0 LUE)

SHADOMAS! PHOSPHOR DOT SCREEN

C'"r CRT
uk engineering




DISPLAYS

Be&.( e.itte! $r. e&#h %"n *&(( thr"%h the *er$r&tin( $ the .&(2, 3hi#h #&"(e( the *h(*hr !t( in the #&tin% t '".ine(#e in the &**r*ri&te #'"r I$ & -e&. i( n'+ e.itte! -+ the re! e'e#trn %"n n'+, then n'+ the re! !t( 3i'' '".ine(#e, &n! i$ the -e&. #.*'ete( & $"'' r&(ter (#&n $ the (#reen, then & #.*'ete'+ re! (#reen 3i'' -e (een T &#hie0e & #'"r !i(*'&+, the three %"n( &re "(e! t .i4 the three *ri.&r+ #'"r( t %i0e the re/"ire! #'"r 1..1 MI'ING COLOURS

M(t #'"r( $ 'i%ht #&n -e .&!e -+ .i4in% t%ether the *ri.&r+ #'"r( $ Re!, B'"e &n! Green When the(e #'"r( &re &!!e! t%ether in !i$$erent *r*rtin(, the+ #re&te ther #'"r( E4&.*'e 1

Re!&n!Green



Ye''3

9

Re! &n! B'"e



M&%ent& 7in28,

:

Green &n! B'"e



C+&n 7'i%ht -'"e8

Se#n!&r+ C'"r(

Nte Re!, B'"e &n! Green &!!e! t%ether .&2e White 'i%ht


uk engineering 1.%



DISPLAYS

STRO!E SCANNING

In &!!itin t the r&(ter !i(*'&+, 3hi#h *r!"#e( ('i! #'"r -'#2(, there 3i'' &'( -e & re/"ir.ent t !i(*'&+ (+.-'( &n! &'*h&n".eri# #h&r&#ter( Thi( i( &#hie0e! -+ "(in% & Str2e (#&nnin% .eth! The !i(*'&+ $ !&t& in &'*h&n".eri# &n! (+.-' $r. i( e4tre.e'+ 3i!e)r&n%in% E4&.*'e; We&ther r&!&r !i(*'&+ nt n'+ h&( t !i(*'&+ the 3e&ther ret"rn( 7r&(ter8 -"t &'( the (e'e#te! .!e, r&n%e #ir#'e( &n! r&n%e !&t&
GREEN

YELLO-

RANGE DATA (LUE)

#" MODE (LUE)

3"

2" - 1"

We&ther R&!&r Di(*'&+
RED

uk engineering




DISPLAYS

In ther !i(*'&+ #n$i%"r&tin( there i( the re/"ire.ent $r #n(i!er&-'e in$r.&tin t -e !r&3n "(in% the (tr2e (#&nnin% .eth! &( 3e'' &( the r&(ter (#&nnin% .eth!
Hn455 STROKE SCANNING IS USED
GS

ATT 2 AOA

2"

RASTER SCANNING

2"

F 1"

1" G

1" S CMD M .66 2"" DH

2"

1" 2"

I DH

EADI Di(*'&+
1#" RA


uk engineering



DISPLAYS

The *(itin n the !i(*'&+ (#reen $ the &'*h&n".eri# r (+.-' i( *re) !eter.ine! &n! (tre! in the .e.r+ .&tri4 7t+*i#&''+ "(in% 5 @  .&tri48 When the .&tri4 i( &!!re((e!, the #h&r&#ter i( $r.e! 3ithin the #rre(*n!in% .&tri4 $ !t( n the (#reen -+ 0i!e (i%n&' *"'(e( *r!"#e! &( the 'ine( &re (#&nne!
% ITS

)

( 1" ITS

3

A'*h&n".eri# Di(*'&+
3


uk engineering



DISPLAYS

S*&#in% i( ne#e((&r+ -et3een in!i0i!"&' #h&r&#ter( &n! &'( -et3een the r3( $ #h&r&#ter( T &#hie0e thi(, &n e4tr& 'ine #&''e! B'&n2in% Bit( i( "(e! It #&n -e (een $r. $i%"re 9=, th&t the 3i!th $ the #h&r&#ter "(e( 5 $ the  -it( &''#&te!, : -it( re*re(entin% the -'&n2in% -it( #re&tin% & (*&#e -et3een e&#h #h&r&#ter n the 'ine The hei%ht $ e&#h #h&r&#ter i(  -it( 3ith & : -it( re*re(entin% the -'&n2in% -it(, 3hi#h 3i'' #re&te 'ine (*&#in% -et3een the #h&r&#ter( 1.6

DISPLAY SYSTEMS

The CRT !i(*'&+ "nit( $ the .re #.*rehen(i0e e'e#trni# in(tr".ent (+(te.( *er&te n the (&.e $"n!&.ent&' *rin#i*'e( &( th(e !e(#ri-e in thi( .!"'e H3e0er, t &**'+ the(e *rin#i*'e(, .re e4ten(i0e .i#r)*r#e((in% #ir#"it &rr&n%e.ent( &re re/"ire! in r!er t !i(*'&+ $&r %re&ter &."nt( $ #h&n%in% !&t& in -th /"&ntit&ti0e &n! /"&'it&ti0e $r. The .i#r*r#e((r *r#e((e( in$r.&tin $r. the D&t& Hi%h3&+ -"( &n!, $r. the .e.r+ #ir#"it(, it i( in(tr"#te! t #&'' "* ("-)*r%r&.( E&#h $ the(e *r%r&.( #rre(*n!( t the in!i0i!"&' (et( $ !&t& re/"ire! t -e !i(*'&+e! Si%n&'( &re then %ener&te! in the re'e0&nt -in&r+ $r.&t, &n! &re ("**'ie! t & S+.-' Gener&tr "nit The S+.-' Gener&tr 3i'' then %ener&te the re'e0&nt ("**'ie( t -e &**'ie! t the -e&. !e$'e#tin &n! #'"r %"n #ir#"it( in r!er t !r&3 the #rre#t !i(*'&+ The -e&. 3i'' -e (#&nne! -th in the r&(ter &n! (tr2e $r.&t( The !i(*'&+e! !&t& i( in t3 -&(i# $r.( 1

9

M0in%!&t&

T&-'e 9 (h3( the t+*e( $ $i4e! &n! .0in% !&t& re/"ire! $r !i(*'&+e! !&t& FI'EDDATA

MOVINGDATA

SYMOLS

SYMOLICPOINTERS

SCALEMAR!INGS

INDE'MAR!S

SYSTEMNAMES

DIGITALCOUNTERS

DATUMMAR!S

SYSTEMSTATUSMESSAGES

Di(*'&+e! !&t& T&-'e 9

uk engineering




AGE INTENTIONALLY BLANK

DISPLAYS

JAR 66 CATEGORY B1 MODULE 5.11

MODULE  ELECTRONIC

uk engineering

DIGITAL TECHNI,UES ELECTRONIC INSTRUMENT SYSTEMS

DISPLAYS

Electronic Displays

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