Advantage Of Lcd Over Crt ik1j

Advantage of LCD over CRT  Smaller size—AMLCDs occupy approximately 60 percent less space than CRT displays—an important feature when office space is limited.  Lower power consumption—AMLCDs typically consume about half the power and emit much less heat than CRT displays.  Lighter weight—AMLCDs weigh approximately 70 percent less than CRT displays of comparable size.  No electromagnetic fields—AMLCDs do not emit electromagnetic fields and are not susceptible to them. Thus, they are suitable for use in areas where CRTs cannot be used.  Longer life—AMLCDs have a longer useful life than CRTs; however, they may require replacement of the backlight.

 MAJOR ADVANTAGES OF LCD (Pros of LCD, Cons of CRT) LCD

CRT

Slim Factor

LCDs are much slimmer than their CRT counterparts. This slimness brings along a host of advantages such as space saving and portability.

Bulky, the back size is proportionate to the size of the monitor

Viewable screen

A 15 inch LCD always has a same size of viewable area as the specifications say.

The viewable area is always about 0.9 - 1.1 inch smaller than the size specified on paper. This is due to the frame around the glass screen.

Larger displays may have their viewable area reduced by at most 0.1 inches. Screen Flatness

100% ninety degrees true perfect flat screen

So a 15" CRT would have only about 14" of viewable area. Many manufacturers tout true flatness for their CRT monitors, but the sad truth is that most are fake. In reality it is only the outer glass that is flat, and not the actual screen. The true 100% perfect flat monitors are the aperture grille tubes made by Mitsubishi and Sony.

Even then, these tubes have a disadvantage - a faint thin line or two (Depending on size) running through the screen to stabilize the grill. Some people find this distracting, especially if you work on a light background (eg. documents) most of the time. Radiation

LCDs emit a very small amount of radiation compared to CRTs. Health conscious consumers prefer them for this one reason.

CRTs emit electromagnetic radiation. Much of it is filtered by the lead heavy glass front and the rest that reaches your eyes are mostly harmless. Even then, radiation still es through the screen and some people regard them as hazardous.

Weight

Power Requirements

LCDs are very light, hence being portable.

CRTs weigh heavier, especially in their front (the display area)

17 inch LCD weighs around 6kg.

17 inch CRT weighs around 16kg.

19 inch LCD weighs around 7kg.

19 inch CRT weighs around 20kg.

Considerably lower power usage.

Higher power usage, more than 200% to an LCD of equivalent size.

17 inch LCD requires around 35 watts 19 inch LCD requires around 45 watts

17 inch CRT requires around 90 watts 19 inch CRT requires around 110 watts

Glare

Little or no glare

Glare is reduced by the use of special filters and treated glass.

Display Sharpness

Sharp (when used at native display resolution)

Slightly less sharp images - but it is noticeable when comparing with LCDs

Automatic Resize

Hit the Auto button, and the display resizes to fit every pixel within its viewable area.

Newer CRTs come with a Auto-Fit feature, but unfortunately it does not work well and requires micro adjustments to fill the screen

Burn-In

LCDs are free from the burn-in issue that plagues CRTs and Plasma displays.

Suffers from burn-in problem.

However, they do occasionally have Image Persistence problems which can be fixed by switching off the LCD for an extended period of time.

If displaying a same image for a prolonged period, it could be embedded in the display permanently.

Refresh Rate (Screen Flicker)

LCDs do not "paint" their image. They provide a flicker free image every time.

A minimum of 75hz is required for a flicker free image. All CRTs already this, except at ultra high resolutions 2048++.

Warmness

Little

Back gets noticeably warm after some time

 MAJOR ADVANTAGES OF CRT (Pros of CRT, Cons of LCD) CRT Dead / Stuck Pixel

There is no such problem in CRTs as images are painted on the screen.

LCD LCD s are prone to dead or stuck pixels (or dots) on the screen due to their manufacturing process. However, stiff competition has made many manufacturers adopt zero dead pixel / stuck pixel warranties for their products.

Response Time

CRTs already have a very fast response time hence this attribute does not apply to it.

This attribute is specially for LCDs as the lower the response rate is, the better the chance of avoiding "ghosting" effect.

Price

Native Resolution

Affordable and cheaper than LCDs due to their declining popularity.

Considerably more expensive, but prices are dropping fast.

17 inch CRT costs around $160

17 inch LCD costs around $275

19 inch CRT costs around $225

19 inch LCD costs around $330

Can be used at any resolution up to the maximum ed. No image quality is lost at any resolution.

Must be used at its native resolution (maximum resolution) for best quality. Using the display at a lower resolution will result interpolation (scaling of the image), causing image quality loss. This is one of the major reasons for CRTs being in use by gamers as the high native resolution that LCD demands may not deliver smooth frame rates.

Max Colors

32 bit

8-Bit max, 16.7 million colors.

Viewing Angle

Wide viewing angle

Narrow viewing angle, depending on technology employed.

Video

Ideal for any video including HD

Not ideal for Standard Definition videos, but great for High Definition videos

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 actual size

Screen Flatness

True Flat

Fake Flat (unless aperture grille)

Radiation

Little or none

More Radiation

Weight

Light

Heavy

Power Requirements

Low Power requirement

250% or more power

Glare

No Glare

Reduced Glare

Image Sharpness

Sharp

Slightly less sharp images

Automatic Resize

Perfect

Imperfect

Burn-In

None

Suffers from burn-in problem

Refresh Rate

No refresh rate (60hz fixed)

Needs refresh rate (minimum 72hz)

Warmness

Little

Back gets warm after some time

 Pros of CRT vs Cons of LCD CRT

LCD

Dead / Stuck Pixel

No such problem

May have dead / stuck pixel

Response Rate

No issue with response rate

Slow

Price

Cheap

Expensive

Native Resolution

None

Has a native resolution

Max Colors

32 bit

8-Bit max, 16.7 million colors.

Viewing Angle

Wide viewing angle

Narrow viewing angle

Video

Ideal for any video viewing including 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 Visual performance Image flicker Image brightness Image geometry Image sharpness Screen viewing area Screen size Specular screen glare Energy consumption Electromagnetic emissions Heat emissions Space efficiency Flexible positioning Weight Color range Cost

CRT

Faster than CRT None Bright, uniform Uniform High Full area, very space efficient Smaller screen for equivalent CRT viewing area None Low No

Slower than LCD Prone to flicker Variable, uneven Distorted Moderate to high Partial area, space inefficient. Larger screen for equivalent LCD viewing area Prone to specular glare High Yes

Minimal High Highly Light Very Good Moderate

High Low Moderate Heavy Excellent Low

LCD TV

Screen size: Viewing angle: Life span: Weight:

Performance at High Altitude:

Power consumption:

Screen Refresh Rate (affects quality of video): Running Temperature: Screen glare:

Plasma TV

Currently 3.38/5 1 2 3 4 5

Currently 3.70/5 1 2 3 4 5

Rating: 3.4/5 (133 votes) 13 - 57 inches Up to 165° 50,000 - 60,000 hours Less weight compared to similar size plasma TV

Rating: 3.7/5 (139 votes) 32 - 60 inches Up to 160° 25,000 to 30,000 hours

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Heavier

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High altitudes (above 6500 ft) can affect the performance LCD TVs are not affected by of plasma TV displays hide high altitudes. because the gas held inside each pixel is stressed, and has to work harder to perform Require less power to operatecompared to plasma Fairly power hungry hide TVs LCD TVs were originally designed for computer data Plasma TV displays refresh displays, and not video. and handle rapid movements hide Refresh rates are therefore not in video about as well as as good. But LCD TVs are normal CRT TVs catching up fast. Cooler than plasma TVs Hotter hide Less glare compared to More glare hide plasma TVs Brighter than plasma Not as bright as LCD hide No burn-in Yes, burn-in is possible hide Minimum 1 inch Minimum 3 inches hide

Brightness: Burn-in: Thickness: Contrast Ratio (measure Up to 15000:1 (not as good as Up to 3000:1 (better than of the blackest Plasma) LCD) black comparedto the whitest white): [edit]Comparison

of Picture Quality

Plasma TVs have an edge over LCD TVs in of overall picture quality. [edit]Contrast

Hide All

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 of Plasma 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-todefine 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 . [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).

[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) s - work by trapping a liquid crystal solution between two sheets of polarized glass. When an electric current es through the liquid crystals, they rotate causing a change in the polarization of the light ing through them in response to the applied voltage. This results in more or less light ing through the polarized glass to reach the face of the display. LCD s do not generate light - rather they filter or subtract light produced by a backlight source to create the image on the 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 never comes in with it.

SIZE AND APPLICATION

LCD

Less than 2” Pager, cell phones, microdisplays Between 2” and 5” Industrial, Internet appliances, mobilephones, cameras/ camcorders, projectors

Presently occupies PM STN or LCOS Presently occupied by PMSTN. AMLCD will enter as higher resolutions and speed requirements increase Mainly occupied by AM LCD

Between 5” to 15” Games, automotive, Internet applications, Instrumentation

SIZE AND APPLICATION

LCD

OLED

Will replace LCD Will replace LCD

Will replace LCD

OLED

Between 15” to 20” Notebook PC and Desktop

Fully occupied by AMLCD a:Si Moving to p:Si

Potential to replace LCD Sony already demonst rate d 15”

Between 20” & 35” TV

Expensive for TV; Tiling by Rainbow is a route

Between 35” & 50” TV, HDTV, Large displays education and advert isement

Not applicable

Less expensive and better performance than LCD. Tiling is possible No technology limitat ions; hopes are high

Above 50” HDTV,Video walls

FED

PLASMA

PROJECTION

Potential exists; Cost? Potential exists; Cost?

Not applicable

Not applicable

Not applicable

Not applicable

Potential exists; Cost? Carbon nanotubes will succeed.

Not Not applicable economical

FED

Potential exists. But technology for large sizes with CNT? Doubtful

Remote possibility

PLASMA

PROJECTION

High end of the size eminently suitable

Not economical

Only choice

Can penetrate into PDP

Less attractive than projection

Prime contender