advantage of lcd over crt

8/2/2019 Advantage of LCD Over CRT

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Advantage of LCD over CRT

Smaller sizeAMLCDs occupy approximately 60 percent less space than CRT displaysanimportant feature when office space is limited.

Lower power consumptionAMLCDs typically consume about half the power and emit muchless heat than CRT displays.

Lighter weightAMLCDs weigh approximately 70 percent less than CRT displays of comparablesize.

No electromagnetic fieldsAMLCDs do not emit electromagnetic fields and are not susceptibleto them. Thus, they are suitable for use in areas where CRTs cannot be used.

Longer lifeAMLCDs have a longer useful life than CRTs; however, they may requirereplacement of the backlight.

MAJOR ADVANTAGES OF LCD (Pros of LCD, Cons ofCRT)

LCD CRT

Slim Factor LCDs are much slimmer than theirCRT counterparts. This slimnessbrings along a host of advantagessuch as space saving and portability.

Bulky, the back size is proportionateto the size of the monitor

Viewable screen A 15 inch LCD always has a samesize of viewable area as thespecifications say.

Larger displays may have theirviewable area reduced by at most 0.1inches.

The viewable area is always about0.9 - 1.1 inch smaller than the sizespecified on paper. This is due to theframe around the glass screen.

So a 15" CRT would have only about14" of viewable area.

Screen Flatness 100% ninety degrees true perfect flatscreen

Many manufacturers tout trueflatness for their CRT monitors, butthe sad truth is that most are fake.

In reality it is only the outer glassthat is flat, and not the actual screen.The true 100% perfect flat monitorsare the aperture grille tubes made byMitsubishi and Sony.


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Even then, these tubes have adisadvantage - a faint thin line or two(Depending on size) running throughthe screen to stabilize the grill.

Some people find this distracting,especially if you work on a lightbackground (eg. documents) most ofthe time.

Radiation LCDs emit a very small amount ofradiation compared to CRTs. Healthconscious consumers prefer them forthis one reason.

CRTs emit electromagneticradiation. Much of it is filtered bythe lead heavy glass front and therest that reaches your eyes are mostlyharmless.

Even then, radiation still passesthrough the screen and some peopleregard them as hazardous.

Weight LCDs are very light, hence beingportable.

17 inch LCD weighs around 6kg.

19 inch LCD weighs around 7kg.

CRTs weigh heavier, especially intheir front (the display area)

17 inch CRT weighs around 16kg.

19 inch CRT weighs around 20kg.

Power

RequirementsConsiderably lower power usage.

17 inch LCD requires around 35watts

19 inch LCD requires around 45watts

Higher power usage, more than200% to an LCD of equivalent size.

17 inch CRT requires around 90watts

19 inch CRT requires around 110watts

Glare Little or no glare Glare is reduced by the use of specialfilters and treated glass.

Display

SharpnessSharp (when used at native displayresolution)

Slightly less sharp images - but it isnoticeable when comparing withLCDs


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Automatic

ResizeHit the Auto button, and the displayresizes to fit every pixel within itsviewable area.

Newer CRTs come with a Auto-Fitfeature, but unfortunately it does notwork well and requires microadjustments to fill the screen

Burn-In LCDs are free from the burn-in issuethat plagues CRTs and Plasmadisplays.

However, they do occasionally haveImage Persistence problems whichcan be fixed by switching off theLCD for an extended period of time.

Suffers from burn-in problem.

If displaying a same image for aprolonged period, it could beembedded in the displaypermanently.

Refresh Rate

(Screen Flicker)

LCDs do not "paint" their image.

They provide a flicker free imageevery time.

A minimum of 75hz is required for a

flicker free image. All CRTs alreadysupport this, except at ultra highresolutions 2048++.

Warmness Little Back gets noticeably warm aftersome time

MAJOR ADVANTAGES OF CRT (Pros of CRT, Cons ofLCD)

CRT LCD

Dead / Stuck

PixelThere is no such problem in CRTs asimages are painted on the screen.

LCD panels are prone to dead orstuck pixels (or dots) on the screendue to their manufacturing process.

However, stiff competition has mademany manufacturers adopt zero deadpixel / stuck pixel warranties fortheir products.

Response Time CRTs already have a very fastresponse time hence this attributedoes not apply to it.

This attribute is specially for LCDsas the lower the response rate is, thebetter the chance of avoiding"ghosting" effect.


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Price Affordable and cheaper than LCDsdue to their declining popularity.

17 inch CRT costs around $160

19 inch CRT costs around $225

Considerably more expensive, butprices are dropping fast.

17 inch LCD costs around $275

19 inch LCD costs around $330

Native

ResolutionCan be used at any resolution up tothe maximum supported. No imagequality is lost at any resolution.

Must be used at its native resolution(maximum resolution) for bestquality. Using the display at a lowerresolution will result interpolation(scaling of the image), causing imagequality loss.

This is one of the major reasons forCRTs being in use by gamers as thehigh native resolution that LCDdemands may not deliver smoothframe rates.

Max Colors 32 bit 8-Bit max, 16.7 million colors.

Viewing Angle Wide viewing angle Narrow viewing angle, depending ontechnology employed.

Video Ideal for any video including HD Not ideal for Standard Definitionvideos, but great for High Definitionvideos

Blackness True Black Between Dark Gray to Gray

Summary Pros of LCD vs Cons of CRT

LCD CRT

Slim Factor Slim Bulky

Viewable screen Full or very close Usually 0.9 inches or less than actualsize


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Viewing Angle Wide viewing angle Narrow viewing angle

Video Ideal for any video viewingincluding HD

Not ideal for videos, unless HD

Blackness True Black Between Dark Gray to Gray

The considerations for each display technology are summarized below:

Consideration LCD CRT

Visual performance Faster than CRT Slower than LCD

Image flicker None Prone to flicker

Image brightness Bright, uniform Variable, uneven

Image geometry Uniform Distorted

Image sharpness High Moderate to high

Screen viewing area Full area, very space efficient Partial area, space inefficient.

Screen size Smaller screen for equivalent CRTviewing area Larger screen for equivalent LCDviewing area

Specular screen glare None Prone to specular glare

Energy consumption Low High

Electromagneticemissions

No Yes

Heat emissions Minimal High

Space efficiency High Low

Flexible positioning Highly Moderate

Weight Light Heavy

Color range Very Good Excellent

Cost Moderate Low


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LCD TV Plasma TV

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All

Currently 3.38/5

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4

5

Rating: 3.4/5 (133 votes)

Currently 3.70/5

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4

5

Rating: 3.7/5 (139 votes)

Screen size: 13 - 57 inches 32 - 60 inches hide

Viewing angle: Up to 165 Up to 160 hide

Life span: 50,000 - 60,000 hours 25,000 to 30,000 hours hide

Weight:Less weight compared tosimilar size plasma TV

Heavier hide

Performance at High

Altitude:LCD TVs are not affected byhigh altitudes.

High altitudes (above 6500ft) can affect the performanceof plasma TV displaysbecause the gas held insideeach pixel is stressed, and hasto work harder to perform

hide

Power consumption:Require less power tooperatecompared to plasmaTVs

Fairly power hungry hide

Screen RefreshRate (affects quality of

video):

LCD TVs were originallydesigned for computer data

displays, and not video.Refresh rates are therefore notas good. But LCD TVs arecatching up fast.

Plasma TV displays refresh

and handle rapid movementsin video about as well asnormal CRT TVs

hide

Running Temperature: Cooler than plasma TVs Hotter hide

Screen glare:Less glare compared toplasma TVs

More glare hide

Brightness: Brighter than plasma Not as bright as LCD hide

Burn-in: No burn-in Yes, burn-in is possible hide

Thickness: Minimum 1 inch Minimum 3 inches hide

Contrast Ratio (measure

of the blackest

black comparedto the

whitest white):

Up to 15000:1 (not as good asPlasma)

Up to 3000:1 (better thanLCD)

hide

[edit]Comparison of Picture Quality

Plasma TVs have an edge over LCD TVs in terms of overall picture quality.

[edit]Contrast in LCD vs. Plasma TVs
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Contrast ratio is a measure to compare the darkest black with the whitest white. Plasma TVs score well on this

parameter with a contrast ratio of up to 3000:1. LCD TVs have a contrast ratio of up to 1000:1; however, this

metric is calculated differently for LCDs so it's not an apples-to-apples comparison. Plasma TVs, in general, offer a

better contrast than LCDs.

[edit]Burn-in

Older models ofPlasma TVs can suffer from burn-in produced by static images. After extended periods, stationary

images 'burn in' the screen and produce an after-image ghost which remains permanently on the screen.

LCD TVs do not suffer from burn-in. However, it is possible for individual pixels on an LCD screen to burn out. This

causes small, visible, black or white dots to appear on the screen.

[edit]Deeper Blacks in Plasma TVs

Plasma TVs are capable of displaying deeper blacks. Improved black levels help render better those difficult-to-

define quality attributes like picture depth, scene detail - especially in television and movie scenes where lots of

dark and light content is shown simultaneously, and color richness. Indirectly, a better black level also leads to

better rendering of picture contrast.

In comparison, the nature of LCD technology where a backlight shines through the LCD layer makes it hard for

it to achieve true blacks, i.e. true absence of light. There is always some light leakage from adjacent picture

elements in an LCD panel.

[edit]Color in Plasma vs. LCD screens

LCD TV displays reproduce colours by manipulating light waves and subtracting colours from white light. This

makes it more difficult for maintaining colour accuracy and vibrancy. But, LCD TVs have colour information benefits

from the higher-than-average number of pixels per square inch found in their displays.

In plasma TVs, each pixel contains red, green, and blue elements, which work in conjunction to create

16.77 million colours. Colour information is more accurately reproduced with plasma TV technology than it is with

any other display technology, including LCD TVs.

[edit]Screen Refresh Rates for LCD vs Plasma

Plasma TV displays refresh and handle rapid movements in video about as well as normal CRT TVs. LCD TVs were

originally designed for computer data displays, and not video. Refresh rates are therefore not as good. But LCD TVs

are fast catching up.

[edit]LCD vs. Plasma - Other factors to consider

Pixel Response Time: Measured in milliseconds (ms). The lower the better.[edit]Readiness for HDTV

Most LCD televisions already have built-in standard TV tuners (HDTV tuners must usually be added externally - but

more are showing up as a standard feature). Usually, Plasmas are monitors-only and may require both external

standard and HDTV tuners to receive television signals (although more are beginning to include

either NTSC and/or HDTV tuners).
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ction=edit&section=5http://www.diffen.com/difference/Category:Technologyhttp://www.diffen.com/difference/Category:Televisionhttp://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26x%3D0%26ref_%3Dnb_sb_noss%26y%3D0%26field-keywords%3DPlasma%2520TV%26url%3Dsearch-alias%253Daps&tag=diffen-20&linkCode=ur2&camp=1789&creative=390957http://www.diffen.com/difference/index.php?title=LCD_TV_vs_Plasma_TV&action=edit&section=4http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26node%3D724227011%252C979929011%26ref_%3Damb_link_85752371_5&tag=diffen-20&linkCode=ur2&camp=1789&creative=390957http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26x%3D0%26ref_%3Dnb_sb_noss%26y%3D0%26field-keywords%3DPlasma%2520TV%26url%3Dsearch-alias%253Daps&tag=diffen-20&linkCode=ur2&camp=1789&creative=390957http://www.diffen.com/difference/index.php?title=LCD_TV_vs_Plasma_TV&action=edit&section=3http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26node%3D724227011%252C979929011%26ref_%3Damb_link_85752371_5&tag=diffen-20&linkCode=ur2&camp=1789&creative=390957http://www.amazon.com/gp/redirect.html?ie=UTF8&location=http%3A%2F%2Fwww.amazon.com%2Fs%3Fie%3DUTF8%26x%3D0%26ref_%3Dnb_sb_noss%26y%3D0%26field-keywords%3DPlasma%2520TV%26url%3Dsearch-alias%253Daps&tag=diffen-20&linkCode=ur2&camp=1789&creative=390957


9/10

[edit]Differences in Life span

LCD TVs life span is typically 50,000-60,000 hours, which equates to about 6 years of 24/7 use. However, LCD TVs

will actually last as long as its backlight does, and those bulbs can be replaced - so in essence there's nothing

which can wear out.

The life span for Plasma TVs is 25,000 to 30,000 hours, which equates to about 3 years of 24/7 usage before the

TV fades to half the original brightness.

[edit]Differences in Technology

Plasma displays uses a matrix of tiny gas plasma cells that are charged by precise electrical voltages to emit light

and create the picture image. In other words, each picture element in a plasma TV display acts as a miniature light

source.

Liquid Crystal Displays (LCD) panels - work by trapping a liquid crystal solution between two sheets of polarized

glass. When an electric current passes through the liquid crystals, they rotate causing a change in the polarization

of the light passing through them in response to the applied voltage. This results in more or less light passing

through the polarized glass to reach the face of the display. LCD panels do not generate light - rather they filter or

subtract light produced by a backlight source to create the image on the panel surface.

[edit]Mercury Use

Plasma TVs do not use Mercury while LCD TVs do in their CCFL backlight. However, this issue is a red herring. Most

common high-efficieny phosphorescent lamps use mercury and it is not a big deal. The amount of mercury used in

LCD TVs is very small and besides, the user never comes in contact with it.
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10/10

Not applicableNot

economical

Potential

exists;

Cost?

Carbon

nanotubeswill

succeed.

Will replace

LCD

Mainly occupied

by AM LCD

Between 5 to 15

Games, automotive,

Internet applications,

Instrumentation

Not applicableNot

applicable

Potential

exists;Cost?

Will replace

LCD

Presently

occupied byPMSTN. AMLCD

will enter as

higher resolutions

and speed

requirements

increase

Between 2 and 5

Industrial, Internetappliances,

mobilephones,

cameras/ camcorders,

projectors

Not applicableNot

applicable

Potential

exists;

Cost?

Will replace

LCD

Presently

occupies PM STN

or LCOS

Less than 2

Pager, cell phones,

microdisplays

PROJECTIONPLASMAFEDOLEDLCDSIZE AND APPLICATION

Prime contenderLess

attractive

than

projection

Above 50

HDTV,Video walls

Can penetrate into PDPOnly

choice

Remote

possibility

No

technology

limitations;

hopes are

high

Not applicableBetween 35 & 50

TV, HDTV, Large

displays education

and advert isement

Not economicalHigh endof the size

eminently

suitable

DoubtfulLessexpensive

and better

performance

than LCD.

Tiling is

possible

Expensive for TV;Tiling by Rainbow

is a route

Between 20 & 35

TV

Potential

exists. But

technology

for large

sizes with

CNT?

Potential to

replace LCD

Sony already

demonstrate

d 15

Fully occupied by

AMLCD a:Si

Moving to p:Si

Between 15 to 20

Notebook PC and

Desktop

PROJECTIONPLASMAFEDOLEDLCDSIZE AND APPLICATION

advantage of lcd over crt

Documents