What are the defects of capacitive touch screen at present?
We know that the capacitance value, although inversely proportional to the distance between the electrodes, is proportional to the relative area, and is also related to the insulation coefficient of the medium.
We know that the capacitance value, although inversely proportional to the distance between the electrodes, is proportional to the relative area, and is also related to the insulation coefficient of the medium. Therefore, when a large area of the palm power ic or handheld conductor close to the capacitor screen rather than touch, it can cause capacitor screen error action, in wet weather, this situation is particularly serious, holding the display, palm close to the display within 7 cm rectifier transformer or body close to the display within 15 cm can cause capacitor screen error action. Another disadvantage of capacitive screens is that they do not respond to the touch of a non-conductive object with a gloved hand or hand. This is due to the addition of a more insulating medium.
The light transmittance and clarity of the capacitive touch screen are better than those of the four-wire resistive screen, and certainly not as good as the surface acoustic screen and the five-wire resistive screen. The capacitor screen reflects light seriously. Moreover, the four-layer composite touch screen of the capacitor technology has uneven transmittance to the light of each wavelength, and there is the problem of color distortion. Due to the reflection of light between the layers, it also causes the blur of image characters.
In principle, the capacitor plate uses the human body as an electrode of a capacitor element. When a conductor is close to the capacitor coupled with a sufficient capacitance value between the sandwich ITO face, the current flowing away will be enough to cause the misoperation of the capacitor plate.