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22 Touch Screen

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As users touch the screen, feedback is provided as to what will be selected: users can adjust the position of the finger, and the action takes place only when the finger is lifted off the screen.

Sears et al. The HCIL team developed and studied small touchscreen keyboards including a study that showed users could type at 25 wpm on a touchscreen keyboard , aiding their introduction on mobile devices.

They also designed and implemented multi-touch gestures such as selecting a range of a line, connecting objects, and a "tap-click" gesture to select while maintaining location with another finger.

In , HCIL demonstrated a touchscreen slider, [30] which was later cited as prior art in the lock screen patent litigation between Apple and other touchscreen mobile phone vendors in relation to U.

Patent 7,, An early attempt at a handheld game console with touchscreen controls was Sega 's intended successor to the Game Gear , though the device was ultimately shelved and never released due to the expensive cost of touchscreen technology in the early s.

The first mobile phone with a capacitive touchscreen was LG Prada released in May which was before the first iPhone. Touchscreens would not be popularly used for video games until the release of the Nintendo DS in This has changed with the commercialization of multi-touch technology, and the Apple Watch being released with a force-sensitive display in April There are a variety of touchscreen technologies with different methods of sensing touch.

A resistive touchscreen panel comprises several thin layers, the most important of which are two transparent electrically resistive layers facing each other with a thin gap between.

The top layer that which is touched has a coating on the underside surface; just beneath it is a similar resistive layer on top of its substrate.

One layer has conductive connections along its sides, the other along top and bottom. A voltage is applied to one layer and sensed by the other.

When an object, such as a fingertip or stylus tip, presses down onto the outer surface, the two layers touch to become connected at that point. The panel then behaves as a pair of voltage dividers , one axis at a time.

By rapidly switching between each layer, the position of pressure on the screen can be detected. Resistive touch is used in restaurants, factories and hospitals due to its high tolerance for liquids and contaminants.

A major benefit of resistive-touch technology is its low cost. Additionally, as only sufficient pressure is necessary for the touch to be sensed, they may be used with gloves on, or by using anything rigid as a finger substitute.

Disadvantages include the need to press down, and a risk of damage by sharp objects. Resistive touchscreens also suffer from poorer contrast, due to having additional reflections i.

Surface acoustic wave SAW technology uses ultrasonic waves that pass over the touchscreen panel. When the panel is touched, a portion of the wave is absorbed.

The change in ultrasonic waves is processed by the controller to determine the position of the touch event. Surface acoustic wave touchscreen panels can be damaged by outside elements.

Contaminants on the surface can also interfere with the functionality of the touchscreen. A capacitive touchscreen panel consists of an insulator , such as glass , coated with a transparent conductor , such as indium tin oxide ITO.

Different technologies may be used to determine the location of the touch. The location is then sent to the controller for processing. Touchscreens that use silver instead of ITO exist, as ITO causes several environmental problems due to the use of indium.

Unlike a resistive touchscreen , some capacitive touchscreens cannot be used to detect a finger through electrically insulating material, such as gloves.

This disadvantage especially affects usability in consumer electronics, such as touch tablet PCs and capacitive smartphones in cold weather when people may be wearing gloves.

It can be overcome with a special capacitive stylus, or a special-application glove with an embroidered patch of conductive thread allowing electrical contact with the user's fingertip.

Some capacitive display manufacturers continue to develop thinner and more accurate touchscreens. Those for mobile devices are now being produced with 'in-cell' technology, such as in Samsung's Super AMOLED screens, that eliminates a layer by building the capacitors inside the display itself.

This type of touchscreen reduces the visible distance between the user's finger and what the user is touching on the screen, reducing the thickness and weight of the display, which is desirable in smartphones.

A simple parallel-plate capacitor has two conductors separated by a dielectric layer. Most of the energy in this system is concentrated directly between the plates.

Some of the energy spills over into the area outside the plates, and the electric field lines associated with this effect are called fringing fields.

Part of the challenge of making a practical capacitive sensor is to design a set of printed circuit traces which direct fringing fields into an active sensing area accessible to a user.

A parallel-plate capacitor is not a good choice for such a sensor pattern. Placing a finger near fringing electric fields adds conductive surface area to the capacitive system.

The additional charge storage capacity added by the finger is known as finger capacitance, or CF. The capacitance of the sensor without a finger present is known as parasitic capacitance, or CP.

In this basic technology, only one side of the insulator is coated with a conductive layer. A small voltage is applied to the layer, resulting in a uniform electrostatic field.

When a conductor, such as a human finger, touches the uncoated surface, a capacitor is dynamically formed.

The sensor's controller can determine the location of the touch indirectly from the change in the capacitance as measured from the four corners of the panel.

As it has no moving parts, it is moderately durable but has limited resolution, is prone to false signals from parasitic capacitive coupling , and needs calibration during manufacture.

It is therefore most often used in simple applications such as industrial controls and kiosks. Although some standard capacitance detection methods are projective, in the sense that they can be used to detect a finger through a non-conductive surface, they are very sensitive to fluctuations in temperature, which expand or contract the sensing plates, causing fluctuations in the capacitance of these plates.

This limits applications to those where the finger directly touches the sensing element or is sensed through a relatively thin non-conductive surface.

Projected capacitive touch PCT; also PCAP technology is a variant of capacitive touch technology but where sensitivity to touch, accuracy, resolution and speed of touch have been greatly improved by the use of a simple form of "Artificial Intelligence".

This intelligent processing enables finger sensing to be projected, accurately and reliably, through very thick glass and even double glazing.

Some modern PCT touch screens are composed of thousands of discrete keys, [49] but most PCT touch screens are made of a matrix of rows and columns of conductive material, layered on sheets of glass.

This can be done either by etching a single conductive layer to form a grid pattern of electrodes , or by etching two separate, perpendicular layers of conductive material with parallel lines or tracks to form a grid.

In some designs, voltage applied to this grid creates a uniform electrostatic field, which can be measured. When a conductive object, such as a finger, comes into contact with a PCT panel, it distorts the local electrostatic field at that point.

This is measurable as a change in capacitance. If a finger bridges the gap between two of the "tracks", the charge field is further interrupted and detected by the controller.

The capacitance can be changed and measured at every individual point on the grid. This system is able to accurately track touches.

Due to the top layer of a PCT being glass, it is sturdier than less-expensive resistive touch technology. Unlike traditional capacitive touch technology, it is possible for a PCT system to sense a passive stylus or gloved finger.

However, moisture on the surface of the panel, high humidity, or collected dust can interfere with performance. These environmental factors, however, are not a problem with 'fine wire' based touchscreens due to the fact that wire based touchscreens have a much lower 'parasitic' capacitance, and there is greater distance between neighbouring conductors.

This is a common PCT approach, which makes use of the fact that most conductive objects are able to hold a charge if they are very close together. In mutual capacitive sensors, a capacitor is inherently formed by the row trace and column trace at each intersection of the grid.

A voltage is applied to the rows or columns. Bringing a finger or conductive stylus close to the surface of the sensor changes the local electrostatic field, which in turn reduces the mutual capacitance.

The capacitance change at every individual point on the grid can be measured to accurately determine the touch location by measuring the voltage in the other axis.

Mutual capacitance allows multi-touch operation where multiple fingers, palms or styli can be accurately tracked at the same time.

Self-capacitance sensors can have the same X-Y grid as mutual capacitance sensors, but the columns and rows operate independently.

With self-capacitance, the capacitive load of a finger is measured on each column or row electrode by a current meter, or the change in frequency of an RC oscillator.

A finger may be detected anywhere along the whole length of a row. This allows for the speedy and accurate detection of a single finger, but it causes some ambiguity if more than one finger is to be detected.

However, by selectively de-sensitizing any touch-points in contention, conflicting results are easily eliminated. Alternatively, ambiguity can be avoided by applying a "de-sensitizing" signal to all but one of the columns.

By selecting a sequence of these sections along the row, it is possible to determine the accurate position of multiple fingers along that row. This process can then be repeated for all the other rows until the whole screen has been scanned.

Self capacitance is far more sensitive than mutual capacitance and is mainly used for single touch, simple gesturing and proximity sensing where the finger does not even have to touch the glass surface.

Mutual capacitance is mainly used for multitouch applications. Capacitive touchscreens do not necessarily need to be operated by a finger, but until recently the special styli required could be quite expensive to purchase.

The cost of this technology has fallen greatly in recent years and capacitive styli are now widely available for a nominal charge, and often given away free with mobile accessories.

These consist of an electrically conductive shaft with a soft conductive rubber tip, thereby resistively connecting the fingers to the tip of the stylus.

An infrared touchscreen uses an array of X-Y infrared LED and photodetector pairs around the edges of the screen to detect a disruption in the pattern of LED beams.

These LED beams cross each other in vertical and horizontal patterns. This helps the sensors pick up the exact location of the touch.

A major benefit of such a system is that it can detect essentially any opaque object including a finger, gloved finger, stylus or pen.

It is generally used in outdoor applications and POS systems that cannot rely on a conductor such as a bare finger to activate the touchscreen.

Unlike capacitive touchscreens , infrared touchscreens do not require any patterning on the glass which increases durability and optical clarity of the overall system.

Infrared touchscreens are sensitive to dirt and dust that can interfere with the infrared beams, and suffer from parallax in curved surfaces and accidental press when the user hovers a finger over the screen while searching for the item to be selected.

A translucent acrylic sheet is used as a rear-projection screen to display information. The edges of the acrylic sheet are illuminated by infrared LEDs, and infrared cameras are focused on the back of the sheet.

Objects placed on the sheet are detectable by the cameras. When the sheet is touched by the user, the deformation results in leakage of infrared light which peaks at the points of maximum pressure, indicating the user's touch location.

Microsoft's PixelSense tablets use this technology. Optical touchscreens are a relatively modern development in touchscreen technology, in which two or more image sensors such as CMOS sensors are placed around the edges mostly the corners of the screen.

A touch blocks some lights from the sensors, and the location and size of the touching object can be calculated see visual hull.

This technology is growing in popularity due to its scalability, versatility, and affordability for larger touchscreens.

Introduced in by 3M , this system detects a touch by using sensors to measure the piezoelectricity in the glass.

Complex algorithms interpret this information and provide the actual location of the touch. Since there is no need for additional elements on screen, it also claims to provide excellent optical clarity.

Any object can be used to generate touch events, including gloved fingers. A downside is that after the initial touch, the system cannot detect a motionless finger.

However, for the same reason, resting objects do not disrupt touch recognition. The key to this technology is that a touch at any one position on the surface generates a sound wave in the substrate which then produces a unique combined signal as measured by three or more tiny transducers attached to the edges of the touchscreen.

The digitized signal is compared to a list corresponding to every position on the surface, determining the touch location. A moving touch is tracked by rapid repetition of this process.

Extraneous and ambient sounds are ignored since they do not match any stored sound profile. The technology differs from other sound-based technologies by using a simple look-up method rather than expensive signal-processing hardware.

As with the dispersive signal technology system, a motionless finger cannot be detected after the initial touch. However, for the same reason, the touch recognition is not disrupted by any resting objects.

The technology was created by SoundTouch Ltd in the early s, as described by the patent family EP, and introduced to the market by Tyco International 's Elo division in as Acoustic Pulse Recognition.

The technology usually retains accuracy with scratches and dust on the screen. The technology is also well suited to displays that are physically larger.

There are several principal ways to build a touchscreen. The key goals are to recognize one or more fingers touching a display, to interpret the command that this represents, and to communicate the command to the appropriate application.

In the resistive approach, which used to be the most popular technique, there are typically four layers:. When a user touches the surface, the system records the change in the electric current that flows through the display.

Dispersive-signal technology measures the piezoelectric effect —the voltage generated when mechanical force is applied to a material—that occurs chemically when a strengthened glass substrate is touched.

There are two infrared-based approaches. In one, an array of sensors detects a finger touching or almost touching the display, thereby interrupting infrared light beams projected over the screen.

In the other, bottom-mounted infrared cameras record heat from screen touches. This means that there are nearly twice as many cross-over points for a fixed number of terminal connections and no 'bussed' connections around the edges of the touchscreen.

In each case, the system determines the intended command based on the controls showing on the screen at the time and the location of the touch.

The development of multi-touch screens facilitated the tracking of more than one finger on the screen; thus, operations that require more than one finger are possible.

These devices also allow multiple users to interact with the touchscreen simultaneously. With the growing use of touchscreens, the cost of touchscreen technology is routinely absorbed into the products that incorporate it and is nearly eliminated.

The ability to accurately point on the screen itself is also advancing with the emerging graphics tablet-screen hybrids.

Polyvinylidene fluoride PVFD plays a major role in this innovation due its high piezoelectric properties, which allow the tablet to sense pressure, making such things as digital painting behave more like paper and pencil.

TapSense, announced in October , allows touchscreens to distinguish what part of the hand was used for input, such as the fingertip, knuckle and fingernail.

This could be used in a variety of ways, for example, to copy and paste, to capitalize letters, to activate different drawing modes, etc. A real practical integration between television-images and the functions of a normal modern PC could be an innovation in the near future: for example "all-live-information" on the internet about a film or the actors on video, a list of other music during a normal video clip of a song or news about a person.

For touchscreens to be effective input devices, users must be able to accurately select targets and avoid accidental selection of adjacent targets.

The design of touchscreen interfaces should reflect technical capabilities of the system, ergonomics , cognitive psychology and human physiology.

Guidelines for touchscreen designs were first developed in the s, based on early research and actual use of older systems, typically using infrared grids—which were highly dependent on the size of the user's fingers.

These guidelines are less relevant for the bulk of modern devices which use capacitive or resistive touch technology.

From the mids, makers of operating systems for smartphones have promulgated standards, but these vary between manufacturers, and allow for significant variation in size based on technology changes, so are unsuitable from a human factors perspective.

Much more important is the accuracy humans have in selecting targets with their finger or a pen stylus. The accuracy of user selection varies by position on the screen: users are most accurate at the center, less so at the left and right edges, and least accurate at the top edge and especially the bottom edge.

This user inaccuracy is a result of parallax , visual acuity and the speed of the feedback loop between the eyes and fingers.

The precision of the human finger alone is much, much higher than this, so when assistive technologies are provided—such as on-screen magnifiers—users can move their finger once in contact with the screen with precision as small as 0.

Users of handheld and portable touchscreen devices hold them in a variety of ways, and routinely change their method of holding and selection to suit the position and type of input.

There are four basic types of handheld interaction:. See your browser's documentation for specific instructions.

HP Customer Support. Select your model. How does HP install software and gather data? Screen does not respond to touch, or responds intermittently Use the troubleshooting steps in this section if the touch screen does not respond, or if the screen sometimes responds and sometimes does not.

Step 1: Confirm the computer has a touch screen If the screen has never responded to touch, but you think it should, use one of these methods to confirm your computer has a touch screen.

In Windows, search for and open View pen and touch info. If the Pen and touch section reads No pen or touch input is available for this display , the computer does not have a touch screen.

Check the product specifications for your computer model on the HP Customer Support website. Check the labels on the computer and on the product packaging.

Notebook and All-in-One computer models equipped with touch screens are branded with the word Touch or TouchSmart.

Step 2: Enable and reinstall the touch screen driver in Device Manager Your touch screen might not respond because it is not enabled or needs to be reinstalled.

Use Device Manager to enable and reinstall the touch screen driver. In Windows, search for and open Device Manager. Right-click the touch screen device, and then click Enable , if possible.

If the Enable option does not display, continue to the next step. Right-click the touch screen device, and then click Uninstall.

Step 3: Configure the touch display Configure the touch display to identify your screen as a touch screen. In Windows, search for and open Calibrate the screen for pen and touch input.

On the Display tab, click Setup. Step 4: Install Windows updates Device driver updates released through Windows update might resolve touch screen issues.

Windows 10 Install the latest Windows 10 updates. In Windows, search for and open Check for updates. When update installation is complete, tap the screen to see if it responds.

If it does not, continue to the next step. Windows 8 Install the latest Windows 8 updates. Click the Windows icon, and then search for and open Windows Update.

A list of available updates opens in a new window. Select updates from the Important and Optional tabs.

Make sure you install all device driver updates. Press the Power button for at least five seconds to turn off the computer.

Turn on the computer and immediately press Esc repeatedly, about once every second. When the Startup menu appears, press F2. There are two interactive touch screen hardware tests.

Click Touch Pointer Test first. Read the on-screen instructions, and then click Run once. Touch each of the blocks on the screen to erase them.

The test ends after you erase all the blocks or after three minutes have passed, and the results display. Click Component Tests , and then click Touch Screen.

Drag each orange rectangle to the box indicated by the arrows with a finger or a stylus. The test ends after you reposition all the blocks or after three minutes, and the results display.

If the diagnostics tests pass but the touch screen still does not respond during regular use, continue to the next step. If one or both tests fail, a digit code, or failure ID, displays.

Contact HP and provide this code. The failure ID is also available in Test Logs on the main menu. Step 6: Adjust the power management settings for your touch screen Power settings can cause the touch screen to stop working after waking from sleep.

Change the power settings so that the touch screen stays active while the computer is in sleep mode. Right-click the touch screen device, and then click Properties.

On the Power Management tab, uncheck Allow the computer to turn off this device to save power , and then click OK.

The touch screen should remain working after waking the computer from sleep. Step 7: Perform a hard reset notebook PCs or full shutdown and restart All-in-One PCs If none of the previous steps worked, perform a hard reset or full shutdown and restart.

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4 thoughts on “22 Touch Screen”

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