Views: 207 Author: Andy Publish Time: 2023-05-15 Origin: Site
Capacitive touch screens only use touch, not pressure, to generate a signal.
Capacacitive touch screens only require correction once or without correction after production, while resistance technology requires conventional correction.
Capacitive solutions will last longer because the components in the capacitive touch screen do not require any movement. In the resistive touch screen, the upper ITO film needs to be thin enough to bend downward to contact the ITO film below.
Capacitive technology outperformed resistance technology in light loss and system power consumption.
The choice of capacitive or resistance technology depends mainly on the object touching the screen. If the finger touches it, make the electricity The touch screen is a better choice. If you need a stylus, whether plastic or metal, the resistance touch screen is competent. A capacitive touch screen can also use a stylus, but it requires a special stylus to match. Surface capacitive can be used for large-sized touch screens, and the appearance is also low, but nowadays it cannot support gesture recognition. Induction capacitive is mainly used for small and medium-sized touch screens and can support gesture recognition.
Capacitive technology is resistant to wear and has a long life, and the user maintenance cost is low, so the overall operating cost of the manufacturer can be further reduced.
A capacitive touch screen is what can support multi-touch technology. And unlike the resistive touch screen, it is slow and easy to wear.
The light transmittance and clarity of the capacitive touch screen are better than those of the four-line resistive screen, of course, but not compared to those of the surface acoustic screen and the five-line resistive screen. The capacitive screen is seriously reflective, and the transmittance of the four-layer composite touch screen of the capacitive technology is uneven at each wavelength. There is also the problem of color distortion due to the reflection of the light between the layers, which also causes blurring of the image characters.
Current: The capacitor screen uses the human body as an electrode for a capacitor element. When there is sufficient capacitance coupled between the sandwich ITO working face, the current is enough to cause misaction of the capacitive screen.
Although the capacitance value is inversely proportional to the interpolar distance, it is directly proportional to the relative area, and it is also related to the insulation coefficient of the medium. Therefore, when a larger area of the palm or hand-held conductor near the capacitor screen rather than touch can cause the capacitor screen error, in wet weather, this situation is particularly serious. A hand near the display within 7 cm or a body near the display within 15 cm can cause the capacitor screen error. Another disadvantage of the capacitive screen is that it is not responsive when touched with a gloved hand or held with a nonconductive object because of the increase in A more insulating medium is used.
Drift: the main disadvantage of the capacitive screen is drift. When the ambient temperature and humidity change and the environmental electric field changes, it will cause the capacitive screen to drift, resulting in inaccuracy. For example, when the temperature of the display rises, the drift: the user touches the other hand or the body side will drift near the display; the larger object near the capacitor touch screen will drift after moving, if the user touches someone around to watch; the drift of the capacitor screen is a technical deficiency, although the environmental potential surface (including the user body) is far away from the capacitor touch screen. They are larger than the finger area and directly affect the determination of the touch position.
Other: in addition, in theory, many relationships that should be linear are actually nonlinear, such as when different body weights or different wet degrees of people suck away the total flow, and the change of the total flow and the four charge flow is a nonlinear relationship; the custom four corners polar frame using the origin of the coordinates; the drift controller cannot detect and recover; and after four A and D, from the value of the four charge flow to the touch point in the X, Y coordinate value calculation process is complex. Since there is no origin, the drift of the capacitive screen is cumulative, and calibration is often required at the work site. The silicon earth protective glass at the outside of the capacitive touch screen is very good, but afraid of nails or hard objects, a small hole will hurt the sandwich ITO, whether it is the interlayer ITO or the inner surface ITO layer, during the installation and transportation, and the capacitive screen cannot work normally.
Low accuracy: Due to technical reasons, the accuracy of the capacitive touch screen is still lacking compared with the resistive touch screen. It can only be input with fingers, and it is difficult to identify more complex handwritten input on a small screen. The cost will be relatively high because the capacitive touch screen still has some technical difficulties in attaching the trackpad to the LCD panel.
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