Tổng Quát về Màn hình CRT

 Lịch sử ra đời của màn hình CRT
• 
 ! "#! $%#&'&()*+,-
./012/&031(456,789:;,<6,8=>
?#/01,@AB&;C1D
• CRT là cụm viết tắt của Cathode-Ray Tube, có nghĩa là ống phóng
điện tử chân không.
• 0!3E>>6,?#/01.*+,-4<&F
(@G&HI'&3$&??E&&J
KKLGG)<)&%
&3$MNK!5A&OP&Q&N
&AR!3S,M/01T<,FKUK
M&-V&3&;W; &?IEVX3BY
&@)
2.Cấu tạo của màn hình CRT
2.1. Bóng đèn
• :W#FA,(Z&[3)*( \,M
]WJ5(^5_&`
• Ra+?(& (M.2b4c>dRM/01M
K_&&AF#(N$[e,M
Q&@f,&AI'B.g4fh,.=45
=7,.845i5i
2.2. Súng
• d&($%[@  [ I Q&Q(N",
#&'& W& % !&!I!RMQ,)&j
#[(a,_&a&_ &3$!I!b>kl
;OF5@I- OF!I!&,M%O, 
VI-I3,&&!I!M,MmI
I-I3,,,&!B[!I!F5M
),&6a&E dW& Ino,!I!,
O\(F.pq\r45,,52pq\rs.p/4q\rtYA %,

I!&[&u# &a(a&v&)&%,#&a,!
.5QB8f>>>>>554!I!&wl@  I  [&E
g>>>2f>>>I&,?,,H3
• D&U[)\
xVEI!,M?,Io&69>ky7>k
z@ ?,,a&E,G&2(&%6G(w ![
@  W& %&F%,
{@ ?,?|)&%6GI- OF&j(&(
&[M)!I!V)&#a&E M
• /6[Iv#&'% !&!#&'$%U
&5&_ &!",#&'&6&W&X?,P
[!I!&FYM&&EIw#&'Iv/01&
,a&$,63X&-+, !&OF&#&#$%
$%Q&@&#&}g2h#! &6&WDN-+,
(w !,M&_ &,M5@!S#5A&F
&$;[!a[!5H&Q
2.3. Hệ thống lệch
• /01&AI'B#&W#&j~#&W#&j(^,
(a[(a+35?),a&U#F3Va+3[
Ve&",#&'#@&$5!),!
[a+3!#&'U#F3VUVe&%
3%&j&OW@
• 1#&WVe&;(a&Ve&Ve&[•hgb
&#&WVe&Oo)g•hgb1Q6MFW)
#:)$_ ;,M3[6Ve&)#e
&8>€G>€
2.4. Màn huỳnh quang
• 15#(W&Q&,![(•Iv(",W&6,Y
&U&,G&F!IW&E[!%,!Y,G&F
I (IW

• 1d‚lW5#I'B,G&FYMU I &E
/"d‚l&,!WGWƒ(",a&B&YGY
,G&F5I)A!(XX,,^G(v&
• RIw&&(, I <A&#$
#IX& !&I![„5-,&w&&!,U&j6,8b9•
…;=bU•…†RP I I'B‡O&
3†,\}.ˆg‰gq\}4,O!+3,,In\^M
.p/4q\/r4G5@,a&Ino,?aF\5^
?,.pq\r/r4pq !&,O\(F.pq\r4
• l@  I ,a&E?,w5&U[)5!W?,
,&E&-%&#a&E ,IwWV,M
)),
• :6,8h7,M,OX&#,,MXX,,^
F&G,MWX &B!I!(K!M&@&!
$3v F(PI-&;& I'B,M)Q
&##IW&3$.7bk45aI!/X&+V,P5,O
&WK6,89><A&-#V!&M&?,!(
,^5@,a&Iw&W,P.Š2g‰f4(a&,O [,a&Iw&W
,O.^‹rg‰f4),&6a&E 
2.5. Bóng mặt nạ
• RIw,a&,G&FEV,G&FW()",#&'
&?V,a&&X,,G&FYPGY&E%F&%,
&E[G(v&(a&h=,.gb4,W&X,,G&F
b>>>>>Y
• Ra&Iv#&'5,a&a+35|A(W&Q&,a&M&,
!,Iv#&'W%,(,#5@&,a&&j
&$TUP,a&#&Wa&B &F D&U[),
(",&Ve&,G&F??a&B5Yd‚lW(+3
,a&&-a&B,?)#&W$m &F Iv
#&'[WIw O; &,a&&j5ASA X&v)

,&,a&&(a'IF(•Iv%,(aQO!
:(IvG&o&jEG&T-5&j&
?^$%&I-#&-a&B1j&#&"
M&j&# IMŒ)(,#&
$G$5&U[!& &j&)&%a
&B(,
3.Nguyên lý hoạt động của màn hình CRT
• RM/01AX&F&j,a&W )#&'5,M(Z
&u5(&Av&+?
• /B, )#&'(^,fW )% )f",#
&'.&E5@f,41,YW),a&IAW&W&.%W+3
&)()*IAW&4
• ,5#&MIAW&A);#&aX&H%!#
&'&-[IA+3W&3P($,G&53%a&W+
?;B,,M)!#&'3AZ,&,a&#
&)##&;X&@K55(Hv&5#&)&F
&!",#&'
• %&F!",#&'&&,a&@X&H&M&W
)/01)B,&XQ&j& E5 E
• ~#&XQ3•!Ž!",#&'3&!&a!
;!%,X&H&,M•,a&@!Y
• /!",I!O3V!Y35v_ 5@  W& ,
N)Io%&HW5@!,Iw!-&f,E(.0•4
• RYY&,G&F,a&%,. O4&E5@(,P2O
B2O,5I- WA [f,3Io&M%&H
• 1#&'AVe&X&&$&j&!I Io&F
,a&5#&I!Adòng quét
• ;W,a&U)AVe&A&NF5$(&!%Ve&; 
U&(@55‘!&MVe&!UAH&j&
OW@IW&$[,MAquét dọc %&F

,a&khung ảnh mành
• qW.,4&F&,a&+3A&Wa&Wa
Ve&3&Wa,&E.’I&4
• q#&'V%, !&I!aI!,&Wa
,Ađộ lưu ảnh. a)„ ,X&$
&%a !&I!,;&
• :;a !&I!,V!_,KM3%a
&,MIo(HU:;a !&I!,V!&W
a,&E %&!#&AM(H_&
• Œ#&A5|,F%M?•_&Ž&M&W&%
 !&g=M•I
• ~#3!,‡VI'B&,M/01)a
&X &Wa,&E&&9>~“
• Quét xen kẽ (interlaced):
 /!U”AVe&&@;;&,M&$
mành lẻ•I)!U–&Fmành chẵn AVe&IdE
! 3)%,&— A&IW,5#[&;&(H
)A%,M(HX !3
• Quét không xen kẽ (non-interlaced):
 /!UVe&A&-#&&-˜%,M)&%A
$mQO!5JH&;&;,F#Io)E5M
V3;&5X$&6&,5#
4. Các yếu tố ảnh hưởng tới màn hình CRT
4.1. Độ phân giải
• lIW%,.dO4A%&H&,MAS(ZIW%,
&$™IW%,&$
4.2. Dot Pitch - Khoảng cách giữa tâm các điểm ảnh
• Œ& &P&MMIwe&RMD•r&)Œ&
d&>g7,,
• +3(?#%&HM!5!SQ&@

%,&,M/01d,T&,&w(%&H!S
š& &š
4.3. Tần số quét (refresh rate)
• lIW,M;5oFM&,a&+3D\h>~“9>~“i
4.4. Colour Depth (Độ sâu của màu):
• qWA,%&H&%,DQB\h7&#,hb>>>,
i
5. Ưu điểm và nhược điểm của màn hình CRT
5.1. Ưu điểm
• 1%#,IwX&&&-&Wa! a +)&%
F&Ad"A 5@,&[5!&;&;O'`^F
5.2. Nhược điểm
• /;,$#S&W#6E!F,M!
&+3NI”$E5@!F,M!