Page 62 - FUNDAMENTALS OF COMPUTER

NPP

62 Fundamentals of Computers NPP

Image Sensors can be CMOS (Complemen- B_oO go§gam| _| CMOS (Complementary Metal
tary Metal Oxide Semiconductor) or CCD Oxide Semiconducter) AWdm CCD (Charge
(Charge Coupled Devices).
Coupled Devices) àM{cV h¡Ÿ&
Support electronics, read the images from BcoŠQ´>m°{ZH$ n[anW B_oO Ho$ AmYma na {g½Zc H$mo
sensor and transfer it to the host computer. hm°ñQ> H$åß`yQ>a H$mo àXmZ H$aVo h¡§Ÿ& g|ga VWm BcoŠQ´>m°{ZH$
Sensors and support electronics can be put in a
single clip to save space. n[anW H$mo EH$ hr {Mn _| ~ZmH$a OJh H$mo ~Mm`m Om
gH$Vm h¡Ÿ&
1.32 Monitor 1.32 _m°{ZQ>a

Computer Monitor is also called Visual H$åß`yQ>a _m°{ZQ>a H$mo {dOwAc {S>ñßco `y{ZQ> ^r H$hVo
Display Unit. This is an output device which h¡§Ÿ& `h EH$ AmCQ>nwQ> `w{º$ h¡ Omo {H$ Vñdra| {XImVm h¡
displays images without producing a
permanent record. There is an electronic circuit naÝVw H$moB© ñWm`r [aH$m°S>© Zht ~ZmVm h¡Ÿ& {S>ñßco ES>mßQ>a
called Display Adapter to generate signals Zm_H$ n[anW H$s _XX go Eogo {g½Zc CËnÞ {H$E OmVo h¢
suitable for monitor screen. The monitors are Omo {H$ _m°{ZQ>a ñH«$sZ na Xem©E OmE§Ÿ& _m°{ZQ>a {d{^Þ
available in different sizes. The size of a monitor AmH$mam| _| CncãY h§¡Ÿ& Xmo {dnarV H$moZm| Ho$ ~rM H$s Xyar
is specified as the distance between two AWdm {dH$U© H$s cå~mB© Ho$ ê$n _| _m°{ZQ>a H$m AmH$ma
opposite corners or simply it is the length of the
diagonal of the screen. Xem©`m OmVm h¡Ÿ&

Types of Monitors _m°{ZQ>a Ho$ àH$ma
Following types of monitors are used with {ZåZ{c{IV _m°{ZQ>a H$åß`yyQ>a Ho$ gmW Cn`moJ _|
computers. Each use different hardware AmVo h¢Ÿ& àË`oH$ _| {^Þ àH$ma H$s hmS>©do`a VH$ZrH$s H$m
technology to generate images: Cn`moJ {H$`m OmVm h¡:

1. CRT Monitor 1. CRT _m°{ZQ>a
2. LCD Monitor 2. LCD _m°{ZQ>a
1.33 CRT Monitor (Cathode Ray Tube) 1.33 CRT _m°{ZQ>a (H¡$WmoS> ao Q²>`y~)

These Monitors use a special tube called BZ_| EH$ {deof àH$ma H$s {nŠMa Q²>`y~ H$m Cn`moJ
CRT Tube. The screen is divided into small hmoVm h¡, {Ogo CRT (Cathod Ray Tube) H$hVo h¢Ÿ& nyao
elements called picture elements or pixel.
Images are produced with the help of pixels. ñH«$sZ H$mo N>moQ>o-N>moQ>o {hñgm| _| ~m§Q> {X`m OmVm h¡, {OÝh|
These are the most popular monitors even today. {nŠMa E{c_|Q> `m {nŠgoc H$hVo h¢Ÿ& BZ {nŠgoc H$s _XX
These are also known a Raster Scan Monitors. go hr B_oO ~ZVr h¡Ÿ& AmO ^r `h g~go à{gÕ _m°{ZQ>a h¡,
Electrons are emitted by an electrically heated BÝh| amñQ>a ñH¡$Z _m°{ZQ>a ^r H$hVo h¢Ÿ& Bg_| EH$ {dÚwV Ûmam
cathode. When electron beam strikes the J_© {H$`m J`m H¡$WmoS> hmoVm h¡ Omo BcoŠQ´>m°Z CËg{O©V H$aVm
specially coated screen, light is emitted. Due to
this emission of light image is formed. One h¡Ÿ& O~ EH$ BcoŠQ´>m°Z ~r_ EH$ naV M‹T>r hþB© ñH«$sZ go
pixel of Color monitor contains three dots Q>H$amVr h¡ Vmo àH$me CËg{O©V hmoVm h¡Ÿ& Bg àH$me go hr
belonging to each basic color red, blue and Vñdra| ~ZVr h¡§Ÿ& H$ca _m°{ZQ>a Ho$ EH$ {nŠgoc _| VrZ S>m°Q>
green. The image on the computer screen is hmoVo h¡§ Omo VrZm| _yc^yV H$ca bmb, Zrbm, ham CËg{O©V