An is a screen with which one interacts by touching the screen's surface rather than by using an input object such as a mouse, and it operates with IR light. With an IR touch screen, there are many different IR light-emitting diodes (LEDs); when a finger or object changes the light pattern, the screen picks up the touch. Unlike some other touch screens, which need a conductor such as a finger, an IR touch screen can be activated with nearly any object. The glass screen of an IR screen does not need to be patterned, so these touch screens tend to have better durability and clarity when compared to other touch screens.
These touch screens are seen on cash registers, some computers and medical devices.With an IR touch screen, there is a photodetector and an array of IR LEDs that cover the entire screen. When the user touches the screen, the touch disrupts the LEDs, and both the screen and photodetector notice this disruption. By correlating the two factors, this touch screen knows exactly where the user touched and simulates a mouse click for that area. This enables users to open files and click buttons without a mouse, which is much more useful in some applications. Most touch screen hardware requires a conductor such as a finger or apparatus, but the IR screen does not need this. The advantage is that anything can be used, so users do not need to purchase or maintain special equipment.
If something falls or unexpectedly touches the screen, however, it will register that as a touch. This means a finger, plastic or metal, pen cap or anything else can be used to operate the IR touch screen.Many touch screen systems require glass with specialized patterns so the computer can recognize where the user is touching. An IR touch screen does not use this system, so the glass is same as with a regular screen. The advantage of this is that the glass usually lasts longer and has better optical quality.
At the same time, these screens may sometimes incorrectly register a touch, because the touch interface is not as sophisticated.IR touch screen hardware is seen most often on cash registers, some desktops and some medical devices. It also is used for some video games, but this is not very common. The reasons behind this touch screen’s wide use are low maintenance and ease of use. @Emilski - Good question. I think the basic advantage of the infrared screen is that it is cheaper and easier to use. The can be located about anywhere, and people can use them with gloved hands or a stylus or whatever they want.For the conductive type, though, it might be more expensive, but the screen quality is much better.
Touchscreens or Human Machine Interface (HMI) It was a touch sensor named ‘Elograph’. Later in 1974, Hurst in association with his company Elographics came up with the first real touchscreen featuring a transparent surface. In 1977, Elographics developed and patented a resistive touchscreen technology, one of the most popular touchscreen technologies in use today. Resistive touch screen can be divided into 4, 5,6, 7 or 8-wired models, which differentiate between the coordinates of touch. As one of the most commonly used, resistive touch screen relies on a touch overlay, constructed by a flexible top layer and rigid bottom layer, divided by insulating spacer dots.
The light emission is brighter, which makes it much more popular for things like cell phones or computer screens where people might be watching videos or viewing pictures.Like someone else mentioned before, some people say that the infrared screens can be affected by bright lights, but I have never seen it happen. Would be an interesting experiment if you had access to an infrared screen. @kentuckycat - I don't think the infrared sensors are actually in the screen. From what I have always read, the infrared part actually comes from a ring of sensor that surround the screen and make a sort of invisible field across the face of the glass. Whenever your finger touches part of the screen, the sensors around the edge can use the X and Y coordinates to figure out exactly where your finger is and how that corresponds to what is on the screen.Because of all that, I don't think shining an infrared beam at the screen would do anything, since there wouldn't be a physical disruption. It would be interesting to try sometime, though.What I am wondering is what the benefit is to having an electrically controlled screen.
A lot of popular devices use them, so there must be some sort of tradeoff between the electric and IR screens. @nony - The IR touch screen seems to be preferable to the stylus in most instances, I would agree. However, sometimes using the human finger as the stylus is not the best alternative in my opinion.This would be in situations where you have a virtual keyboard on something like a PDA and you “fat finger” one of the keys with your finger.I’ve done that quite a lot, and in those instances I much prefer to use the stylus. It’s precise and easy to maneuver.I see the IR touch screen as being more preferable in situations where you don’t need that kind of precision.
I know that some tablet computers are used in educational settings for example and kids can just point to objects on the screen or drag and drop them, and the IR touch screen would be more appropriate for those kinds of situations. I thought it was really interesting reading about how one of these screens worked. I always wondered about them. Like the article mentions, I knew some other types of screens used either electrical currents or just pressure, but I never thought about them being able to use changes in light.So, since it is infrared, does that mean it is using two different types of light at once?
Obviously, there is some sort of visible LED that shows what we see on the screen, but does it also have infrared that you could see if you looked through a camera with an infrared sensor or something?Along those same lines, too, what would happen if you were to shine something like a TV remote at one of the screens. Would it have any effect, or does there have to be a real touch? @lighth0se33 - I personally don't think there is anything wrong with it. I hit the buttons with my fingers most of the time, and so does everyone else I know. The only thing I can think of is that some people might not want to touch a screen that someone else has touched, but then again, the stylus would probably have more germs on it than the touch screen.I have actually been to quite a few places where there isn't a stylus, and you have to use your finger, even for signing your name.Is there anything that a normal person would have in their home that would use an infrared touch screen? I'd like to take a better look at the screen itself now that I know in general how one of them works. All I can really think of is a cell phone, but mine doesn't have a touch screen.
I know that the touch screen I use at stores after swiping my debit card responds to either a pen stylus or my finger. Sometimes, the stylus works better, though, because certain screens need to have more pressure applied to them to respond.Generally, I use the stylus when I have to sign my name on the screen, and I use my finger to press “yes” or “no” buttons.
If I already have the stylus in hand, though, I will use it to press the button areas, too.Sometimes, I get self-conscious when using my finger if a stylus is present. I don't know whether it is considered proper etiquette to use my finger, but when I am holding a card in one hand and people are behind me, it just seems quicker.
Does anyone know if cashiers think it rude to use your finger on the touch screen?
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4.2. 4.3.Cathode Ray Tube (CRT)This monitor uses a Cathode Ray Tube (CRT). CRT tube creates an image on the screen using a beam of electrons. CRT consists of one or more guns that fire a beam of electrons inside the screen. The screen is coated with very tiny Phosphor dots from inside. The beam of electrons repeatedly falls on the surface of screen.
Every beam fall takes only a fraction of second. CRT in color monitors consists of three guns. These guns generate red, green and blue (RGB) colors. The other colors are generated with a combination of these three colors.
Nowadays, most of the CRT monitors are replaced by Flat Panel Monitors. Flat Panel MonitorsFlat Panel Monitors take less space and are lightweight. These monitors use much less power than CRTs. It does not emit harmful radiations. It is much expensive than CRT. Notebook computers, PDA and cellular phones use flat panel monitors.
Flat panel monitors are available in different sizes such as 15”, 17”, 18” & 19” etc.Flat panel display is made up of two plates of glass. These plates contain a substance between them. The substance is activated in different ways.There are two types of technologies used in flat panel display screens.
Liquid Crystal DisplayLiquid crystal display screen contains a substance called liquid crystal. The molecules of this substance line up in such a way that the light behind the screens blocked or allowed to create an image.
LCDs provide a sharper picture than CRTs and emit less radiation. LCD displays requires less power and take up less space than CRT. Gas plasma DisplayGas plasma display uses gas plasma technology. This technology uses a layer of gas between two glass plates. The gas release ultraviolet light when voltage is applied. The pixels on the screen glow due to this ultraviolet light and form an image.
Plasma display is available in the sizes of upto 150 inches wide. It provides richer colors than LCD monitors but are more expensive. That is why, it is not commonly used. It provides higher display quality. This type of monitor can hand directly on a wall. Touch Screen MonitorsTouch screen monitors are used for input as well as output.
A touch screen is a special type of visual display unit. It has a grid of light beams or fine wires on the screen.
It lets the user to interact with a computer by the touch of a finger rather than typing on a keyboard or moving a mouse. The user enters data by touching icons or menus identified on the screen.Most touch screen computers use sensors to detect touch of a finger. Touch screen is well suited for simple applications like ATM. It has also become common in department stores and supermarkets.Types of touch Screen MonitorsThere are different types of touch screen technology. The most common types are Resistive, Surface wave & Capacitive.
Resistive Touch ScreenThis monitor usually has a coat of thin electrically conductive and resistive layer of metal. A change in electrical current occurs when it is pressed. The input can be processed by a computer. These monitors are the most popular types of touch screen monitors used today. They are usually not affected by dust or liquids which make them very reliable.
Surface Wave Touch ScreensThese monitors use ultrasonic waves to process input from the screen. These waves flow over the touch screen. The wave is absorbed and processed by computer when a person touches the pad. Capacitive Touch ScreenThese screens are coated with indium tin oxide. This material provides continuous current across the screen.
The current can be measure by the processor when the pad is touched. It is usually used with a bare finger instead of stylus. These screens have high clarity and are not affected by dust. Nowadays most of the smartphones have Capacitive Touch screens.