These are just all our notes gathered in one.
The real presentation we will be giving to miss will be different.
Download the other document “Final Presentation” and see what it actually looks like.
The main goal here is to try and make things as easy as possible for us to understand, remember, and to present in our presentation.
What everyone needs to do is:
1.
Choose one paragraph to work on.
2.
We may already have notes but try to put as much as possible in your own words. Some things can be quotes. E.g.. the definition of a computer. There is no point putting that in your own words since the definition given is a fact.
3.
Get more notes if you want, but please be sure to copy the url address like I did. (We have to show where we got our information from and from who)
Finally, we have to finish off our presentation as quickly as possible so we can work on how we will be doing our presentation.
Note: look at the font and space of the words.
They are all typewritten, doubled spaced, Verdana, 12 point font (as stated in our project instructions.

Go to http://freeknowledge.weebly.com to find this same document and download. (copy and paste in the link in the address bar)
Presentation: Touch Screen monitors http://en.wikipedia.org/wiki/Computer_monitor
Definition of a monitor
A monitor or display (sometimes called a visual display unit) is a piece of electrical equipment which displays images generated by devices such as computers , without producing a permanent record. The monitor comprises the display device, circuitry , and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a cathode ray tube (CRT).
; http://encarta.msn.com/dictionary_1861630951/monitor.html
Computer display device: a video device that displays data or images generated by a computer or terminal
;
(Note: just get a simple definition of a monitor, about two or three lines or even less. State where you got the definition from please)

1.
History of computer monitors http://www.articlealley.com/article_80885_10.html
A little Vintage Computer Monitor History
Date Published: 13th August 2006
Author: Arthur Fellon RSS Views: 2678 PRINT ASK ABOUT THIS ARTICLE
Until the early 1980's most monitors were terminals. They were boxy video display terminals
(VDT's) combined with an attached keyboard. A terminal could be configured to work with just about any computer on the market. (Not that there was a wide selection of personal computers for you to choose from.)
Terminals were attached to computers by a serial interface. In those days, the VDT was commonly referred to as a CRT (Cathode Ray Tube).
Before DOS, the dominant operating system (OS) for 8 bit computers was CP/M (Control Program for Microprocessors). Early CP/M machines were originally designed to use separate memorymapped video display devices and discrete keyboards that plugged into the machines � not unlike video display cards used later. The most well known was the VDM-1. Terminal manufacturers recognized this "lost market "and began to market mainframe and mini-style terminals to the CP/M

community. The sales pitch of "just like a real (mainframe at the time) computer" paid off. CP/M computers soon used terminals almost exclusively.
Apple II computers and the early game machines (such as those made by Atari, Coleco or Nintendo) hooked to a monitor not a terminal. (The Apple II was built with a keyboard as part of the system.
All that was missing was a monitor once the Apple II was plugged in).
These monitors � unlike terminals � looked like television sets without the tuner. In some cases they actually were television sets. (Many early computers � such as the Commodores Vic 20, 64 and 128, could be used with any television set with a special RF adapter that hooked to the antenna of the TV).
Then IBM came out with PC-DOS computers, which were dubbed "three-piece computers.' One explanation according to a prominent used car dealer Moonie Bronstein was that many of the early marketers / hucksters advising the techies of the early computer era ,had their start in the competitive world of auto sales where such terms as " 3 piecers " and " 4 piecers" were popular marketing and sales terms. Other explanations for this marketing term was because the computers included three main components i.e. � the monitor, the keyboard and the CPU "box".

Ironically, when the IBM PC-DOS computers arrived on the scene with separate monitor and keyboard � the monitor connected directly to the computer. Just like the earliest personal computers) through a display device connection. These new monitors used video cards that were either IBM monochrome (MDA), IBM color graphics cards9 CGA), or Hercules (the first third party ad on cards). http://www.buzzle.com/articles/computer-monitors.html
Computer Monitors
An overview of computer monitors, different types of computer monitors
A long time has passed since the first computer monitors were introduced. Way back when these units were first introduced, they were available in monochrome only and most of the computer monitors used to have a bright green display on a jet black background. These were known as monochrome monitors and they did not use to have high quality displays. The displays that we see on the monitors are caused by the electrons directed on a phosphor coating on the screen by the cathode gun of the picture tube.
To put it simply, the computer monitor comprises of a display device along with the circuitry required to form a display using the signals sent by an external source. The computer monitor receives the signals sent by the CPU of the PC and displays the same on the surface of the monitor.
In the old days, the computer monitors were available in just one size, 14 inches. As times passed on the developers of computer monitors saw the problems that the end users were facing due to the onscreen resolution and also the quality of display.
Apart from these problems the old computer monitors were not smart enough to display smooth pictures, in fact the first generation computer were not designed to display images since there were no applications at that time that could output images. Charts and pie images came far later on. Most of the work required during those days were linear in nature and used to be displayed using a series of fine lines. Even a circle was constituted of fine straight lines and if one has access to old computer monitors, they will see the circle as a jagged image. Even the CPU’s available during that time were simple ad did not have the capacity to do the amount of number crunching that is required for displaying graphic images.

As the CPU’s became more and more powerful, so did the programs running on them and hence the demand for better quality computer monitors kept increasing. Keeping graphics in mind the first color computer monitors were introduced. Initially these computer monitors did not have a high resolution since lots of memory was required to run them. With the advent of graphic cards, the main memory of the computer was relieved of a huge part of its burden.
The size of monitors too started increasing and they were available in sizes up to 19?. These computer monitors were all CRT based (cathode ray tube) and used to consume a lot of power, apart from that they were bulky and heavy too and used to occupy a lot of space on the table. With the advent of the LCD (liquid crystal display) computer monitors, these issues were resolved, but they were very costly, hence, not affordable to the home users. Thanks to mass production, even the prices of LCD computer monitors dropped and nowadays there is hardly any difference between the price of a CRT and a LCD computer monitor.
By Stoyan Stoyanov
Published: 9/10/2008

What are touch screen monitors? http://en.wikipedia.org/wiki/Touchscreen
A touchscreen is a display that can detect the presence and location of a touch within the display area. The term generally refers to touch or contact to the display of the device by a finger or hand.
Touchscreens can also sense other passive objects, such as a stylus. However, if the object sensed is active, as with a light pen, the term touchscreen is generally not applicable. The ability to interact directly with a display typically indicates the presence of a touchscreen.
The touchscreen has two main attributes. First, it enables one to interact with what is displayed directly on the screen, where it is displayed, rather than indirectly with a mouse or touchpad.
Secondly, it lets one do so without requiring any intermediate device, again, such as a stylus that needs to be held in the hand. Such displays can be attached to computers or, as terminals, to networks. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices, mobile phones, and video games.
Types of touch Screen monitors http://en.wikipedia.org/wiki/Touchscreen
Types of touch screen technology
Touch-screen monitors have become more and more commonplace as their price has steadily dropped over the past decade. There are three basic systems that are used to recognize a person's touch:
 Resistive
 Capacitive
 Surface acoustic wave
The resistive system consists of a normal glass panel that is covered with a conductive and a resistive metallic layer. These two layers are held apart by spacers, and a scratch-resistant layer is placed on top of the whole setup. An electrical current runs through the two layers while the monitor is operational. When a user touches the screen, the two layers make contact in that exact

spot. The change in the electrical field is noted and the coordinates of the point of contact are calculated by the computer. Once the coordinates are known, a special driver translates the touch into something that the operating system can understand, much as a computer mouse driver translates a mouse's movements into a click or a drag.
In the capacitive system, a layer that stores electrical charge is placed on the glass panel of the monitor. When a user touches the monitor with his or her finger, some of the charge is transferred to the user, so the charge on the capacitive layer decreases. This decrease is measured in circuits located at each corner of the monitor. The computer calculates, from the relative differences in charge at each corner, exactly where the touch event took place and then relays that information to the touch-screen driver software. One advantage that the capacitive system has over the resistive system is that it transmits almost 90 percent of the light from the monitor, whereas the resistive system only transmits about 75 percent. This gives the capacitive system a much clearer picture than the resistive system.
On the monitor of a surface acoustic wave system, two transducers (one receiving and one sending) are placed along the x and y axes of the monitor's glass plate. Also placed on the glass are reflectors
-- they reflect an electrical signal sent from one transducer to the other. The receiving transducer is able to tell if the wave has been disturbed by a touch event at any instant, and can locate it accordingly. The wave setup has no metallic layers on the screen, allowing for 100-percent light throughput and perfect image clarity. This makes the surface acoustic wave system best for displaying detailed graphics (both other systems have significant degradation in clarity).
Another area in which the systems differ is in which stimuli will register as a touch event. A resistive system registers a touch as long as the two layers make contact, which means that it doesn't matter if you touch it with your finger or a rubber ball. A capacitive system, on the other hand, must have a conductive input, usually your finger, in order to register a touch. The surface acoustic wave system works much like the resistive system, allowing a touch with almost any object
-- except hard and small objects like a pen tip.
As far as price, the resistive system is the cheapest; its clarity is the lowest of the three, and its layers can be damaged by sharp objects. The surface acoustic wave setup is usually the most expensive.
SAW Technology
Touch screen monitor - Architecture
Benefits to society
The future of touch screen monitors
Bibliography

……………………………………………… http://www.techterms.com/definition/monitor
Monitor
The term "monitor" is often used synonymously with "computer screen" or "display." The monitor displays the computer's user interface and open programs, allowing the user to interact with the computer, typically using the keyboard and mouse.
Older computer monitors were built using cathode ray tubes (CRTs), which made them rather heavy and caused them to take up a lot of desk space. Most modern monitors are built using LCD technology and are commonly referred to as flat screen displays. These thin monitors take up much less space than the older CRT displays. This means people with LCD monitors have more desk space to clutter up with stacks of papers, pens, and other objects.
"Monitor" can also be used as a verb. A network administrator may monitor network traffic, which means he watches the traffic to make sure the bandwidth usage is within a certain limit and checks to see what external sources may be attempting to access the network. Software programs may monitor the system's CPU performance as well as RAM and hard disk usage.

Finally, monitors also refer to speakers used for monitoring sound. Audio engineers typically use
"studio monitors" to listen to recordings. These high-end speakers allow the engineers to accurately mix and master audio tracks. So a sound mixer could be monitoring a recording visually using a computer monitor, while monitoring the sound using audio monitors at the same. As you can tell,
"monitor" serves as a rather http://searchcio-midmarket.techtarget.com/sDefinition/0,,sid183_gci212588,00.html#
- In computers, a monitor is a computer display and related parts packaged in a physical unit that is separate from other parts of the computer. Notebook computers don't have monitors because all the display and related parts are integrated into the same physical unit with the rest of the computer. In practice, the terms monitor and display are used interchangably. http://monitors.org/ (advantages of LCD monitor)
Within the last couple of years, it seems like everyone suddenly has to have a flat panel monitor instead of the traditional CRT monitor (which stands for Cathode Ray Tube, in case you were wondering). But is this flat panel trend simply a passing fad, or are there really advantages to buying an LCD or plasma monitor?
The answer to that question is a resounding yes. There are many different advantages to owning a flat panel monitor. The first is, obviously, size. A flat panel monitor takes up much less room than the traditional, boxy CRT monitor does. This saves you a lot of desk space, plus it makes it much easier to move your monitor around if you need to since flat panel screens are much lighter.

Another benefit is that many flat panel monitors have an adjustable base. This lets you raise the monitor so that it’s an eye level without stacking it on top of books or buying a special little shelf to put it on.
The fact that flat panel monitors are available as wide screens is another advantage. CRT monitors are almost always square or close to it. With a flat panel, though, you can get screens that are 16:10 or so, which give you a lot more computer desktop space. These monitors are great for several things. First, more monitor space allows you to have more windows open side by side. If you’re doing internet research, for example, you can open a browser window and your word processor program and resize them so they’re side by side. This makes it much easier to type notes and saves time since you won’t be constantly switching between the two programs. In fact, these wide screen monitors almost eliminate the need for using dual monitors since the main benefit of having two monitors attached to your computer is that it allows you to run two programs side by side. The wider screen is also nice if you plan to watch a lot of movies on your laptop computers.
Viewing quality is another reason why flat panel monitors are becoming very popular. LCD and plasma screens are capable of presenting much clearer, crisper images than CRT monitors. This is especially useful for anyone who does a lot of graphic arts or video editing. Many of the new flat panel monitors include digital connections in addition to the standard analogue cables, which is nice if your graphics card has digital output.
Finally, price and availability are also becoming issues in the flat panel verses CRT debate. Because they take up less room, businesses can stock more flat panel monitors than CRT monitors, and many have begun phasing out the traditional monitors. Plus, the price of flat panel monitors has dropped dramatically in the last five years. If things continue the way they have been, you won’t be able to find many CRT monitors for sell. However, as you can see, these flat panel monitors aren’t just a trend—there are many advantages to purchasing and using them.

http://www.essortment.com/hobbies/monitorcomputer_sdna.htm (how computer monitors work)
Everyone knows what a computer monitor is. Computers are such an integral part of our life that almost everyone has had some contact with a computer monitor. But how do they work?
The first concept we need to understand is that of the pixel. If you take a magnifying glass and look at the screen of your computer monitor or television set while it’s turned on, you’ll notice that the picture is actually made up of thousands of dots of light. Each of these dots is a pixel. Pixel incidentally is a shorthand term for “picture element”. Most of us have heard of pixels if only because digital cameras are rated in megapixels. The prefix mega means one million. So now you know that if you have a 2.1 megapixel camera, every picture will have 2.1 million dots in it. Go ahead, count ‘em if you don’t believe me.
We also know that the higher the number of megapixels the better the camera is considered to be.
Why? Suppose you had a picture that was one inch by one inch and it had 50 pixels per inch. This is about what you see if your computer monitor is set to a resolution of 640 X 480 pixels. Each pixel is about 1/64 of an inch from its neighbor and to the eye the individual pixels blend together and form a continuous picture. Now enlarge this picture to 10 X 10 inches. The pixels are now ten times as large and the space between them is over 1/8th inch. Now your eye can easily see each pixel and the picture looks terrible. The greater the number of pixels, the larger you can make the image and

the closer you can look without seeing the individual pixels. This is what is meant by higher resolution.
So the screen of your computer monitor is made up of dots (pixels) and the more dots there are per inch of screen the higher the resolution and the better the screen images look. Now we have to discuss how the monitor makes those dots light up. There are several different technologies used for monitors but by far the most common is the same as that used for years in television sets. Early experimenters with electricity found that they were able to produce a stream of sub-microscopic negatively charged particles (electrons) by electrically heating a metal filament in a vacuum.
Because these particles were negatively charged, their direction could be changed by sending them between two metal plates one of which was charged positive and one negative. By adjusting the amount of charge on the plates the amount of change in direction could be varied. This device became known as an electron beam gun.
At about the same time, certain compounds were discovered that glowed whenever they were struck by electrons. These were called phosphors. Combining these two elements produced what is known as a cathode ray tube. The picture tube in your TV set is a cathode ray tube. The tube is a vaguely pyramid shaped affair. The base of the pyramid is the screen. The inside of the screen is coated with phosphors and the electron gun is located at the point of the pyramid. A very thin beam of electrons is sent towards the screen and electrical circuits between the gun and screen bend the beam so that it swings from side to side and up and down. Each side to side swing creates a line across the screen and when the beam reaches the edge of the screen, it moves down and creates another line just below the first. When the bottom of the screen is reached the beam returns to the top and starts over.
So now we can create a series of lines on the screen but how do we make a picture? If you turn the beam on full strength, the line will be bright white, if you turn the beam off, the line will be black.

Anything in between will produce various shades of gray. So we produce a picture by varying the intensity of the beam while it is swinging back and forth. Of course all of this happens so quickly that your eye doesn’t see any of it. Only the overall picture is visible. But, you ask, what about color?
The secret to producing a color picture lies in the fact that any color can be produced by combining varying amounts of red, green and blue. Researchers soon found phosphors that glowed red or green or blue when struck by electrons of certain strengths. They also found ways to create three streams of electrons from one gun. The last leap was to be able to coat the inside of the screen with phosphors in such a way that each pixel actually contained a dot of red phosphor, a dot of green phosphor and a dot of yellow phosphor. So now you had three guns sweeping across the screen each one varying in intensity to create just the right color on each pixel. Now do you understand why it took so long to produce a reliable color TV set? And aren’t you amazed that they are as cheap and reliable as they are?
This is the technology that is inside most computer monitors. They look like small TV sets because basically that’s what they are. The other type of monitor that is beginning to become common is the flat panel monitor. The most often used technology in these devices is the liquid crystal display.
Remember mood rings from the ‘70s? Mood rings were the public’s first introduction to liquid crystals. These were liquids that changed colors as their temperature varied. You can still buy desk thermometers made with this technology. Other liquid crystals were found to change color when subjected to electricity. These are the kind used for flat panel monitors. Two sheets of glass have rows of very fine almost invisible wire placed on them. One row runs side to side, the other top to bottom. These sheets are put together with a layer of liquid crystal between them. When electricity is applied to one of the up and down wires and also to one of the side to side wires, the point where they intersect glows with a color that depends on the intensity of the electricity. This creates one

pixel of the image. Creating the entire image requires many scans at speeds much faster than your eye can see.
There are some other technologies being developed for use in monitors but these are the two major types in use now. Understanding a little about how these devices work gives you a real appreciation of the science and technology that created them. http://www.associatedcontent.com/article/425432/five_disadvantages_of_flat_panel_computer.ht
ml
Five Disadvantages of Flat Panel Computer Monitors
October 28, 2007 by
D Swain
D SwainSingle page
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Monitors | Panel | Flat
Flat panel computer monitors are quickly becoming more popular than the traditional CRT monitors. However, they have a few disadvantages when compared to the traditional design. Some of these include durability, color, and viewing angle. This article will discuss some of the

disadvantages of flat panel computer monitors.
Durability
One of the first disadvantages of flat panel computer monitors is their durability. Many people like to leave their computer and monitor on even when they aren't using them. However, flat panel computer monitors won't last that long if you leave them on like that. This will cause them to lose their brightness and need to be replaced in about two years.
Color
One of the next disadvantages of flat panel computer monitors deals with their color quality. CRT monitors can produce high quality and sharp images. Although flat panel computer monitors are newer, they still can't compete with the color quality of CRT monitors. However, the average computer user will not be able to tell the difference.
Viewing Angle
Another disadvantage of flat panel computer monitors is their viewing angle. CRT monitors can be viewed from wide angles. You usually can't view flat panel computer monitors from a wide angle.

You have to view the monitor as close to the center as you can. This may not be a disadvantage if you usually sit straight in front of your monitor.
Price
One of the biggest disadvantages of flat panel computer monitors is their price. They can sometimes can twice as much as CRT monitors. A CRT monitor that measure 15 inches will usually cost from
$75 to $100. 15 inch flat panel computer monitors usually start around $125.
Pixels
One of the final disadvantages of flat panel computer monitors deals with pixels. If you mainly use your computer to play games, then you may want to stick with CRT monitors. Flat panel computer monitors have much lower pixel response times, so they are not ideal for heavy gaming. This can also present a problem when doing other tasks such as editing videos and graphics. http://www.associatedcontent.com/article/425430/five_advantages_of_flat_panel_computer.html?
cat=15
Five Advantages of Flat Panel Computer Monitors

October 28, 2007 by
D Swain
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Monitors | LCD Monitors | Flat | Personal Computer | Panel | Flat Screen
CRT monitors have been around since the invention of the personal computer. The newer flat panel computer monitors have a few advantages when compared to the older design. Some of these include power, radiation, and space. This article will discuss some of the advantages of flat panel
computer monitors.
Power
One of the first advantages of flat panel computer monitors deals with power. These monitors consume much less power than CRT monitors. This will definitely benefit you if you frequently use your computer. You will save a lot of money on your energy bill by using flat panel computer monitors.

Radiation
One of the next advantages of flat panel computer monitors deals with radiation. Traditional CRT monitors emit radiation that can be harmful over time if you spend a lot of time in front of your computer. Flat panel computer monitors have a lot fewer emissions than CRT monitors. Therefore, they are a lot safer to use.
Space
Most people buy flat panel computer monitors because they take up less space. CRT monitors are very bulky and can easily take up half of your desk. Flat panel computer monitors use their size efficiently, as they are usually just a few inches thick. This will allow you to use more of the space on top of your desk.
Size
One of the next advantages of flat panel computer monitors deals with their sizes. They are usually available in larger sizes than CRT monitors. They can come in wide screen or extra large screen sizes. Since flat panel computer monitors are thinner, you can easily bit their larger sizes wherever you need to.

Environment
One of the final advantages of flat panel computer monitors deals with the environment. These monitors are much more environmentally friendly. CRT monitors have more parts to get rid of.
They also need to be disposed on carefully as some of their contents can harm the environment.
Flat panel computer monitors have less parts to get rid of. This also means that LCD monitors will take up less space in the landfills.
Top Flat-Panel LCD Monitors Under $250
August 11, 2006 by emily price emily priceSingle page
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LCD Monitors | Monitors | Flat Panel | Computer Desks | Lcd Monitor

Computer desks often have little room to house anything other than your computer monitor and accessories. If you want to have a little more room on your computer desk then buying a flat panel monitor can save you a lot of space on your computer desk. Flat panel monitors are all LCD
screens and are not only small in size, they are also much easier to move around and manipulate than your old bulky monitor. LCD screens can be easier to see, and can offer you a much crisper and clearer picture than you have with your traditional monitor. Replacing your old monitor with an updated LCD version doesn't have to be a very expensive endeavor. Here is the top 17-inch LCD monitors under $250.
Gateway Flat-Panel LCD Monitor
FPD1760
This great flat panel monitor by gateway offers 1280 x 1024 maximum resolution. The monitor will allow you to have more space on your desk top while getting a much better resolution video with brighter crisper colors than your previous monitor. The monitor has digital and standard analog input. The screen is treated with an anti-glare treatment making your monitor have fewer glares and be easier to see. This 17" monitor usually sells for around $200.
Hewlett-Packard Flat-Panel LCD Monitor
Vs17e

This 17" flat panel monitor by Hewlett Packard also has a 1280 x 1024 maximum resolution. The monitor has speakers built into the monitor making it so you do not have to use external speakers along with the monitor if you do not want to. This monitor can tilt to the degree of your choosing for maximum viewing and has wall mounting ability so you can truly save space in your home by attaching your monitor to the wall rather than using desk space. Another great feature of this monitor is that it is energy efficient with full Energy Star compliance. This Hewlett Packard monitor is typically $225.
Sony Flat-Panel LCD Monitor
SDM-HS75P/S

Me0 http://www.cs.brown.edu/~tld/publications/books/talking/web/home-Z-H-13.html
An overview of computer monitors, different types of computer monitors.
A long time has passed since the first computer monitors were introduced. Way back when these units were first introduced, they were available in monochrome only and most of the computer monitors used to have a bright green display on a jet black background. These were known as monochrome monitors and they did not use to have high quality displays. The displays that we see on the monitors are caused by the electrons directed on a phosphor coating on the screen by the cathode gun of the picture tube.
To put it simply, the computer monitor comprises of a display device along with the circuitry required to form a display using the signals sent by an external source. The computer monitor receives the signals sent by the CPU of the PC and displays the same on the surface of the monitor. In the old days, the computer monitors were available in just one size, 14 inches. As times passed on the developers of computer monitors saw the problems that the end users were facing due to the onscreen resolution and also the quality of display.
Apart from these problems the old computer monitors were not smart enough to display smooth pictures, in fact the first generation computer were not designed to display images since there were no applications at that time that could output images. Charts and pie images came far later on. Most of the work required during those days were linear in nature and used to be displayed using a series of fine lines. Even a circle was constituted of fine straight lines and if one has access to old computer monitors, they will see the circle as a jagged image. Even the CPU’s available during that time were simple ad did not have the capacity to do the amount of number crunching that is required for displaying graphic images.
As the CPU’s became more and more powerful, so did the programs running on them and hence the demand for better quality computer monitors kept increasing. Keeping graphics in mind the first color computer monitors were introduced. Initially these computer monitors did not have a high resolution since lots of memory was required to run them. With the advent of graphic cards, the main memory of the computer was relieved of a huge part of its burden.
The size of monitors too started increasing and they were available in sizes up to 19?. These computer monitors were all CRT based (cathode ray tube) and used to consume a lot of power, apart from that they were bulky and heavy too and used to occupy a lot of space on the table. With the advent of the LCD
(liquid crystal display) computer monitors, these issues were resolved, but they were very costly, hence, not affordable to the home users. Thanks to mass production, even the prices of LCD computer monitors dropped and nowadays there is hardly any difference between the price of a CRT and a LCD computer monitor.
By
Stoyan Stoyanov
Published: 9/10/2008

http://www.buzzle.com/articles/lcd-monitor-reviews-best-lcd-monitors.html
- information –
-
LCD screens are quickly replacing CRT screens, as the default choice for monitors of computers. To know more about the best LCD monitors, take a look at this LCD monitor review. Read on.
LCD monitors have flat-panel screens that may be colored or black-and-white. LCD is an acronym for
'liquid crystal display', and these displays are found in most devices nowadays, such as calculators, MP3 players, digital watches, TVs and cell phones . Unlike a CRT (cathode ray tube) monitor that takes up a lot of space and is very heavy, an LCD monitor is thin and quite lightweight. LCDs were first used in laptops, but later were sold as separate monitors for desktops.
The size of LCD monitors is between 15 inches and 21 inches. There are two kinds of LCD monitors, active-matrix and passive-matrix. Active-matrix displays, also known as TFT displays, are of better quality than the passive-matrix displays. When reading LCD monitor reviews to choose which one to buy, the most significant factors to look at are the contrast ratios, brightness, viewing angles and response times.
Factors which affect your choice of LCD monitor
Contrast ratio is the ratio of the brightest white color to the darkest black color on the monitor screen. It is always better to have a high contrast ratio than a low contrast ratio. Low-end LCD monitors have a

contrast ratio of 350:1, while the high-end LCD monitors have a contrast ratio of 500:1. The standard unit of brightness is nit, or candela per square meter. Most LCD monitors have a brightness of 250-300 nits.
The viewing angle gives an idea about where a viewer should position himself, while watching the LCD monitor. If the viewer goes to the side, or stands up and watches the LCD monitor from top, then the quality of the picture becomes worse. The horizontal viewing angle should be at least 140 degrees, while the vertical viewing angle should be at least 120 degrees.
Response time, also known as latency, is the time needed for a pixel to go from black to white and then back to black again. Response time becomes important, when watching DVD movies or playing video games. If the response time is too slow, then one starts to see blurring or distortions. The unit of response time is milliseconds and a response time of 25 ms should be enough for most purposes, while a response time of 17 ms is necessary for video gaming.
An LCD monitor is brighter and also consumes less power than a CRT monitor. They cause less eye strain and also give out less radiation, thus causing less harm to one's health. However, people who use graphics software, such as Adobe Photoshop , still prefer CRT to LCD monitors. LCD monitors may sometimes give problems with the backlight and may fail within a few years of use.
Liquid crystals were discovered in 1888, and RCA made the first LCD in 1968. The liquid crystal in an
LCD, is neither liquid nor solid. It is closer to the former than the latter. The twisted liquid crystals untwist, when an electric current is applied to them. They do not allow light to pass through them, making some parts of the LCD screen darker than other parts. LCDs can be reflective, which means that they can throw back the light from an external light source.
A common-plane-based LCD can be a 7-segment display and can be found in microwave ovens and digital clocks. The 7-segment display can show all the numbers from 0 to 9. If the resolution of a monitor is 1024x768, the monitor has 786432 pixels. Passive-matrix displays have slower response times than active-matrix displays. A slow response time causes a trail to follow the pointer, when the mouse is moved rapidly. Passive-matrix displays also produce fuzzy images.
LCD can produce a grayscale, which is a series of 256 shades from white to black. Each pixel in an LCD has three subpixels which that are red, blue and green. The red subpixel can produce 256 shades of red, and the blue and green subpixels can do the same respectively. This leads to a range of 16.8 million colors.
A monitor with outstanding picture quality is the 22-inch HP w2207h, having a resolution of 1680x1050.
The best price on the HP w2207h LCD monitor is $179. A higher-end model is the 24-inch Samsung
SyncMaster 2443BWX LCD monitor. It has a resolution of 1920x1200, and a best price of $194.99.
By Mukul Deshpande
Published: 7/15/2009

http://www.wisegeek.com/what-are-touch-screen-monitors.htm
The benefits of such technology are obvious. Rather than lugging along extra input devices such as a mouse or a keyboard, the user need only his finger to manipulate the chosen device. But it's not just mobile devices that benefit from this type of input. All kinds of devices can be equipped, including TV and computer monitors, LCD screens, and the older CRT computer monitors. As a result, a bartender can press on a screen to ring up drinks on a busy night rather than type in a price, a nurse can input patient information with one hand. Truly, the possibilities with touch screen monitors are endless.
Touch screen monitors usually come in three varieties that enable it to recognize a person's touch. These are resistive, capacitive and surface acoustic wave . The resistive type works by having two panels with a thin space between them. When the user presses the screen, the two panels touch at that point, and the exact coordinates are then registered with the computer.
A capacitive system runs a small electrical charge throughout the touch screen. When the user touches the chosen area, some of the electrical charge is distributed to the finger, lessening the charge at that location. The coordinates are again recorded and sent to the computer. This type of touch screen produces a clearer picture because it transmits more light and doesn't require two panels.
Finally, the surface acoustic wave system is the best, and results in the clearest picture. Transducers are used to send electrical signals across the screen, and if a user touches the screen, they can determine where based on how the electrical signal is received from one transducer to the other http://www.wisegeek.com/s/touch-screen-monitors http://www.hachstuff.com/touchscreen/

June 27th, 2009 by admin | Filed under Touch Screen .
A touch screen is a touch input device that carries out the functions of both the video display unit and input devices (keyboard and mouse)’ Touch screens have been very popular in recent years and can see all of the shopping malls, airports, fast food restaurants, and ATMs’
The touch-screen technology has been around since the 1970s and there are several companies that manufacture equipment with touch screen’ A touch screen to save space and maintenance, making them popular information kiosks’ These touch screen displays, whether in the form of touch screens or add-on panels that are mounted on a monitor screen’
A touch screen has three main components that allow the operation of the touch sensor, the driver and the driver software’ The driver software is the application program that translates the feeling of touching the controls and communicates with the operating system installed on your computer’ The controller is a PC card that connects the touch sensor for the team’ It is a small gadget that translates the information from the sensor into contact with information that is understandable to the PC’
There are several technologies used in the manufacture of touch screen touch’ The screen can build resistance, capacitive or surface wave technology senses’ A resistive touch screen is where a thin metal layer acts as a tough primary sensory layer’ Raises the resistance layer and move the button as an electrical impulse’ However, the touch screen using capacitive capacitive tendency of the human body, due to interference in its own layer and the capacitive touch sense’
Alternatively, the surface wave touch screen, uses ultrasonic waves’ These waves pass over the touch screen’ Some waves are absorbed when the user touches the screen’ This wave of change events contact and location’
Touchscreen technology using the principles of physics, but the touch screen greatly simplifies communication’ With easy to use and attractive interface, a touchscreen is very privileged to games, training and information’