Page 64 - FUNDAMENTALS OF COMPUTER
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64 Fundamentals of Computers NPP
Disadvantages of CRT Monitors CRT _m°{ZQ>a H$s hm{Z`m§
1. Large size and heavy weight. 1. BZH$m AmH$ma ~‹S>m d dOZ A{YH$ hmoVm h¡Ÿ&
2. Non-flat CRT screen have geometric 2. Á`m{_Vr` {dH¥${V nmB© OmVr h¡Ÿ& (Zm°Z-âboQ CRT ‘|)
distortion.
3. Older CRTs are prone to burn. 3. nwamZr CRT _| OcZo H$s g§^mdZm ahVr h¡Ÿ&
4. When we start monitor some warm up 4. O~ Bgo Mmcy H$aVo h¢ Vmo {MÌ AmZo _| Wmo‹S>m g_`
time is needed for cathode to be heated cJVm h¡ Vm{H$ H¡$WmoS> Ja_ hmo gHo$Ÿ Am¡a Bbo³Q´>m°Z
and emit electrons.
{ZH$bo&
5. Greater electrical power consumption. 5. {dÚwV e{º$ H$m ì`` A{YH$ hmoVm h¡Ÿ&
6. Very high internal voltage. 6. BZ_| AË`{YH$ CÀM Am§V[aH$ dm°ëQ>oO hmoVo h¢Ÿ&
7. Prone to Noise due to surrounding 7. Amgnmg Ho$ {dÚwV Mw§~H$s` úmoÌ Ho$ H$maU emoa CËnÞ
electromagnetic field. hmoVm h¡Ÿ&
1.34 LCD (Liquid Crystal Display) 1.34 EbgrS>r ({c{ŠdS>> {H«$ñQc {S>ñßco) _m°{ZQ>a
Monitor NPP
These are most popular display devices _m°{ZQ>a ZE H$åß`yQ>am| _| `o AË`{YH$ à{gÕ _m°{ZQ>a
for new computers. There are two types of LCD h¢Ÿ& LCD _m°{ZQ>a ^r Xmo àH$ma Ho$ hmoVo h¢:
Monitor-
1. Passive LCD Monitors: These are older 1. no{gd LCD _m°{ZQ>a: `o nwamZo LCD _m°{ZQ>a
LCD Monitors. They have poor contrast, slow hmoVo h¢Ÿ& BZH$m H§$Q´>mñQ> Iam~ hmoVm h¡ VWm H$m_ H$aZo H$s
response and other image defects.
J{V H$_ hmoVr h¡Ÿ&
2. TFT LCD Monitors: These are Thin Film 2. TFT LCD _m°{ZQ>a: Bggo VmËn`© h¡ Thin Film
Transistor LCD Monitors. They have much Transistor LCD _m°{ZQ>aŸ& BZ_| {MÌ H$s JwUdÎmm A{YH$
better picture quality, improved response and hmoVr h¡Ÿ& H§$Q´>mñQ> AÀN>m hmoVm h¡ d H$m_ H$aZo H$s J{V ^r
good contrast. A TFT is a special kind of Field AÀN>r hmoVr h¡Ÿ& TFT EH$ {deof àH$ma H$m FET (Field
- Effect Transistor (FET) made by depositing Effect Transistor) hmoVm h¡Ÿ& Bgo EH$ AmYma na AÕ©MmcH$
thin films of a semiconductor active layer as
well as the dielectric layer and metallic contacts H$s EH$ nVcr naV M‹T>m H$a Cg na namd¡ÚwV nXmW© d YmVw
over a supporting subtrate. A common subtrate H$m gånH©$ ñWm{nV {H$`m OmVm h¡Ÿ& ½cmg (H$m§M) AmYma
is a glass. Material used for TFT is generally H$m H$m`© H$aVm h¡ {Ogo g~Q´>oQ> H$hVo h¢Ÿ& gm_mÝ`V: Bg_|
silicon. In TFT LCD Monitor Transistors are {g{cH$m°Z Zm_H$ AÕ©MmcH$ nXmW© H$m Cn`moJ {H$`m OmVm
embedded within the panel itself. It reduces h¡Ÿ& TFT LCD _m°{ZQ>a _| `o Q´>m°{OñQ>a n¡Zc _| hr Ow‹S>o hmoVo
cross talk and improves image stability. h¢Ÿ& Bggo B_oO H$s JwUdÎmm gwYaVr h¡Ÿ&
Advantages of LCD Monitor LCD _m°{ZQ>a Ho$ cm^
1. Very compact and light weight. 1. `h AmH$ma _| N>moQ>m d dOZ _| hëH$m hmoVm h¡Ÿ&
2. Lower electric power consumption. 2. Bg_| {dÚwV H$m ì`` AË`§V H$_ hmoVm h¡Ÿ&
3. No geometric distortion due to flatness. 3. g_Vc hmoZo Ho$ H$maU Á`m{_Vr` {dH¥${V H$_ hmoVr h¡Ÿ&
4. Negligible flicker. 4. Bg_| {âcH$a Zht hmoVmŸh¡Ÿ&
