The company has a group of cooperation teams engaged in the PCAP Touch Screen, ITO Technology Multi-touch Screen industry for many years, with dedication, innovation spirit and service awareness, and has established a sound quality control and management system to ensure product quality.
When deciding between resistive and capacitive touch, be sure to consider where as well as how the display will be used. Different use cases call for different touch technology.
Resistive touchscreens use a relatively simple technology. A resistive touchscreen comprises two flexible sheets with an air gap between them. When the screen is touched, the sheets make contact. Then the touch location is calculated based on voltages using and an ADC. Read more about how to implement a resistive touchscreen.
Resistive touchscreens register touches made with a finger (even if gloved), stylus, pencil eraser or anything with an end blunt enough not to damage the screen. Most ATMs, card readers at the grocery store, and older home electronics (think that GPS you bought for your car in 2006) use resistive touch sensing.This is our 5″ resistive touch display. The tail from the touchscreen is visible coming down in the middle of the display and is connected to the main display tail under the black protective tape.
Because resistive touchscreens are relatively simple and require only four lines to sense touch, the lines connecting the touchscreen to the microcontroller are often incorporated into the main display tail, meaning only one connection between the display module and the controller are needed.
Capacitive touchscreens are a little more complicated. Capacitive touchscreens work by registering a change in an electrostatic field on the screen when touched with an adequately capacitive object, like a finger. Gloved fingers or a stylus may be used, but they must have conductive materials to simulate a bare finger.
As capacitive touchscreens require a controller and more lines, the tail of a capacitive touchscreen is usually separate from the main display tail.This is our 5″ capacitive touch display. It is the same display as the display with the resistive touchscreen. On the main tail, you can see four pads where the resistive touchscreen tail would connect. To the right of the main tail, you can see the capacitive touch tail.
Beyond the methods of obtaining a touch, there are pros and cons that must be considered when deciding between a resistive touchscreen and a capacitive touchscreen.
The following table compares resistive and capacitive touchscreens across a variety of categories. In short, resistive touchscreens are less expensive and work well in outdoor applications, but do not age well (they can get scratched, and become hazy with age) and can only register a single touch. Capacitive touchscreens use a glass top layer so they maintain more of the display’s brightness. Plus, capacitive touchscreens can support multiple touches and gestures. The main draw backs for capacitive touchscreens are the higher cost and lower tolerance of environmental factors.
Compare some of our families of displays that include a no-touch, resistive touch, and cap touch version. The 5″ sunlight readable displays, above, start at 1000 nits and drop into the 800s.
Further, consider our 3.9″ bar-type display. Without a touchscreen, this display boasts a respectable brightness of 500 nits. With a capacitive touchscreen applied, the brightness drops to a typical brightness of 400 nits. The brightness with a resistive touchscreen applied drops even further, to a typical brightness of 350 nits.This is the 3.9″ cap touch display which can recognize five distinct touches at once. The photographed display is running as part of an EVE module.
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