Jun. 24, 2024
We all use touchscreens every day. Touch panels are so common, that we don&#;t notice them anymore. Think about all the times when you use touch panels: typing out a text message, getting cash from an ATM, and adjusting the temperature in the office.
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You might be aware of the differences between particular touch panel modules. Touch panels vary in response time, required pressure or different texture under your fingers.
Each type of touch panel responds differently because of the underlying technology.
You want to choose the best type of touchscreen for the project you&#;re working on? Try to decide based on what environment and what circumstances the display will be used in.
The three main touch screen components are:
Our shop gives you two versions to choose from: capacitive and resistive touch panels.
Let&#;s start with resistive touch panels.
The history of resistive touch panels starts in the s. For years, that was the most common touch input technology. But it wasn&#;t just the number of years the resistive touch panels had over capacitive ones. Resistive touch panel technology is cheaper than the capacitive touch screen components.
According to the technology name, the resistance measurement is what detects the touch. The pressure on the screen of the touch panel translates directly to change in the Ohm value.
A resistive touch panel has several layers:
The conductive layers of ITO or Indium Tin Oxide (see the image above) are separated by spacer dots. That prevents them from touching one another while the touch panel is not in use. What happens when a finger touches the touch panel? This space between spacer dots disappears and the layers detect the resistance change. Then the coordinates of the touch are being calculated.
The main advantages of resistive touch panels are:
Resistive touch panel disadvantages:
Capacitive touch panel technology relies on the capacitance of the human body. Meanwhile, the resistive technology depends on pressure applied on the touch panel., and not on pressure like resistive technology. There are two types of capacitive touch panels &#; surface capacitive and projected capacitive.
Both touch panels work on detecting the change of capacitance on the screen.
Capacitive touch panels are more often used for big surfaces, as they need less accuracy.
Let&#;s see take a look at how capacitive touch screen components work.
As you probably may already know, a thin glass surface covers capacitive touch screens. Under this glass surface, covered with a protective layer, lies a thin layer of electrodes. The electrodes on the corner of the touch panel provide the voltage for the thin film layer. As your finger touches the screen a small electrical charge is transferred to the finger and the electrical circuit is complete. This creates a voltage drop on that part of the screen, and the touch is being detected.
The projected capacitive touch panel is a more complex capacitive technology. Beneath the glass with the protective cover (mentioned above), there is a pattern of electrode layers &#; called the matrix. This pattern forms the plane of X and Y coordinates, which the controller uses to calculate the touch event.
This variant of touch panels is used for smaller dimensions, as it&#;s more accurate than surface capacitance.
This is why you can&#;t use a capacitive touch screen when you&#;re wearing gloves.
Capacitive technology advantages are:
The disadvantages are:
So, next time you&#;re starting a project and you don&#;t know what type of touch screen components you should choose, check out this article. Think about what kind of environment the touch panel will be in. If you are planning to use this device in a more rugged, industrial setting, a resistive touch panels will work better. It&#;s because you can use this touch panel with both gloved hands and a stylus.
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But if you design the device for a more sophisticated application, then a capacitive touch panel is our recommendation. With capacitive touch panels multi-touch is not a problem, you can easily scroll and have excellent sensitivity.
Focus LCDs offers resistive and capacitive touch panels options for all standard and custom displays. Resistive touch was the original touch interface option and is very common for outdoor and industrial applications. Capacitive touch is a newer touch interface and has more precision and control. The applications for capacitive touch panels are usually gesture oriented such as cell displays.
Touch panels, both resistive and capacitive, are made of a few unique components that can be chosen based on the application. The touch interface of a display is comprised of a touch sensor embedded in film or the cover glass of the display. The sensor is then controlled and processed by an independent touch IC. The touch sensor then sends the input signals to the external display and touch processor.
This note will discuss the unique features and constraints of the two touch panel options for LCDs, with emphasis on the differences between each technology and their price ranges.
Resistive Touch Panels
Resistive touch panels are a common touch interface that utilizes resistors to indicate the signal of a touch on the display. Resistive touch panels are typically inexpensive and a good solution for integrating touch capabilities. They can also be used with or without a signal controller. Using a resistive touch panel controller can promote the precision and accuracy of the touch position. Alternatively, analog push sensing can be done without a resistive touch controller. This would act as a sensor to detect the on or off state within a certain frame.
A resistive touch panel can be incorporated into the glass or film on the surface of a display. The film or glass has a conductive layer on parallel surfaces that complete a circuit when pressed together. The sensor can then measure the voltage at different positions when the layers are compressed. This is done with an internal voltage divider circuit that has various resistances at different locations on the screen. The options for resistive touch panels are available in four and five wire resistive touch configurations.
Voltage across the panel is measure in the positive and negative x and y axis. The touch panel is connected through four or five wires that represent these x and y direction signals. Each connection pin represents the direction and positive or negative orientation. Four and five wire resistive touch panels both work by sensing the voltage at the location pressed in with these coordinates.
The difference between four and five wire resistive touch panels is the number of layers that are used to sense the touch position. Four wire resistive touch panels will have a top and bottom conductive layer that measures the compressed location of the panel. The five-wire resistive touch panel will have an additional layer for sensing the corners of the display. This allows the 5-wire resistive touch panel to measure touch locations with greater accuracy.
Resistive touch panels are also a great option for applications that require some level of noise immunity. Their sturdy and accurate touch sensor will withstand environmental conditions that capacitive touch panels cannot.
Capacitive Touch Panels
Capacitive touch panels are a more modern method of integrating a touch interface with a display. This type of touch panel uses an array of capacitors to determine where on the surface the user is touching. This is done by grounding the capacitors when a touch is detected, thus discharging them at that particular display location. These changes in capacitance can be calibrated for very reliable and accurate measurements.
Similar to resistive touch panels, capacitive touch sensors are located in between an insulative glass and a conductively coated film, but they are more accurate at determining the precise touch position.
There are multiple different types of capacitive touch panels. Each type is most commonly defined by the number of touch locations that the sensor can detect. Touch location options for capacitive touch panels consist of 1-point, 2-points, 5-points, and 10-points. The number of points does not include the ability to detect gestures on the display.
Capacitive touch panels can be more expensive than resistive touch panels due to the advanced nature of the technology. These touch panels require a special controller IC that measures and controls signals to accurately determine touch locations. The precision of a capacitive touch panel is only limited by the display size. Therefore, they are a best suited for larger displays requiring touch capabilities because the surface area is large enough to enable precise touch sensing.
Some common applications for capacitive touch panels include cellphones, navigation systems, tablets, cameras, and computer screens. Capacitive touch panels can be incorporated into any TFT or other custom display applications and has the added benefit of durability as well as flexibility.
Resistive vs. Capacitive
When deciding which touch panel is the best option for your application, it is important to assess the advantages and disadvantages of each technology.
The benefit of a resistive touch panel over a capacitive touch panel is the low price and low power consumption. Resistive touch panels are a great, inexpensive option for applications that do not require the precision of capacitive touch sensing, in addition to applications with concerns relating to power consumption.
Another advantage of resistive touch is the ability to detect touch with gloves or a stylus. Capacitive touch sensors often only detect gestures supplied by bare hands due to the sensing requirements. This makes resistive touch panels superior for harsh temperatures as well as industrial, medical, and outdoor applications.
Capacitive touch panels require a conductor, such as the human body, to discharge the capacitors to implement the touch detection. This means that the touch events will not be processed for insulated, non-conductive objects. For example, wearing gloves can prevent the sensor from communicating the touch event. However, it is possible to integrate non-conductive touch into your capacitive touch panel with the addition of a high-tech sensing chip.
An additional advantage of capacitive touch panels is their sensitivity to a touch&#;s location. Their sensors can detect multiple touches at a time, allowing the implementation of gestures. An example of multi-touch gesturing would be zooming out of an image on the display by pinching two fingers together against the screen. This is an advantage over resistive touch sensing which can only detect one touch location at a time.
The cost analysis of each touch panel type is a large factor in deciding which technology to use. In some cases, the additional expense of capacitive touch features does not benefit the interface or application. Below is a review of each touch panel technology.
DISCLAIMER
Buyers and others who are developing systems that incorporate FocusLCDs products (collectively, &#;Designers&#;) understand and agree that Designers remain responsible for using their independent analysis, evaluation and judgment in designing their applications and that Designers have full and exclusive responsibility to assure the safety of Designers&#; applications and compliance of their applications (and of all FocusLCDs products used in or for Designers&#; applications) with all applicable regulations, laws and other applicable requirements.
Designer represents that, with respect to their applications, Designer has all the necessary expertise to create and implement safeguards that:
(1) anticipate dangerous consequences of failures
(2) monitor failures and their consequences, and
(3) lessen the likelihood of failures that might cause harm and take appropriate actions.
Designer agrees that prior to using or distributing any applications that include FocusLCDs products, Designer will thoroughly test such applications and the functionality of such FocusLCDs products as used in such applications.
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