Kunlun Tongtai touch screen - the advantages and disadvantages of capacitive touch screen

merit

Capacitive touch screens only need to be touched, and no pressure is required to generate a signal.

Capacitive touch screens require only one or no correction after production, while resistive technology requires conventional correction.

The capacitive solution has a longer lifespan because the parts in the capacitive touch screen do not need to move. In a resistive touch screen, the ITO film on the top needs to be thin enough to be elastic so that it bends downward to contact the ITO film underneath.

Capacitive technology is superior to resistive technology in terms of light loss and system power consumption.

The choice between capacitive and resistive technology depends mainly on the object touching the screen. If it is a finger touch, a capacitive touch screen is a better choice. If a stylus is required, whether plastic or metal, a resistive touch screen will do the trick. A capacitive touch screen can also use a stylus, but a special stylus is required to match.

Surface capacitive can be used for large touch screens, and the combination is also low, but it cannot support gesture recognition nowadays: inductive capacitive is mainly used for small and medium-sized touch screens, and can support gesture recognition.

Capacitive technology is wear-resistant, has a long service life, and is low-maintenance for the user, so the overall operating expenses of the manufacturer can be further reduced.

Capacitive touch screens can support multi-touch technology, and unlike resistive touch screens, they are unresponsive and less prone to wear and tear.

shortcoming

The light transmittance and clarity of the capacitive touch screen are better than the four-wire resistive screen, and of course, it cannot be compared with the surface acoustic wave screen and the five-wire resistive screen. The capacitive screen is seriously reflective, and the four-layer composite touch screen of capacitive technology has uneven transmittance to each wavelength of light, and there is a problem of color distortion, and due to the reflection of light between the layers, it also causes the blurring of image characters.

Current: In principle, the capacitive screen uses the human body as an electrode of a capacitor element, and when the conductor is close to the capacitor with sufficient capacitance value coupled with the working surface of the sandwich ITO, the current flowing away is enough to cause the malfunction of the capacitive screen.

Although the capacitance value is inversely proportional to the distance between the poles, it is directly proportional to the relative area and is also related to the insulation coefficient of the dielectric. Therefore, when the palm of the hand or the conductor held in a larger area is close to the capacitive screen instead of touching, it can cause the malfunction of the capacitive screen, and in humid weather, this situation is particularly serious, and the malfunction of the capacitive screen can be caused by holding the monitor, the palm of the hand is close to the display within 7 cm or the body is close to the display within 15 cm. Another disadvantage of capacitive screens is that they do not react when touched with gloved hands or when holding non-conductive objects, which is due to the addition of a more insulating medium.

Drift: The main disadvantage of the capacitive screen is drift: when the ambient temperature and humidity change, and the ambient electric field changes, it will cause the drift of the capacitive screen, resulting in inaccuracy. For example, the temperature of the display rises after powering on, which will cause drift: when the user touches the screen, the other hand or side of the body will drift when the user touches the screen; Large objects near the capacitive touch screen will drift after moving, and if someone comes around to watch when the user touches it, it will also cause drift; The reason for the drift of the capacitive screen is a congenital deficiency of technology, although the environmental potential surface (including the user's body) is far away from the capacitive touch screen, it is much larger than the finger area, and they directly affect the determination of the touch position.

Other: In addition, theoretically many relationships that should be linear are actually nonlinear, such as: the total amount of current sucked by people with different weights or different degrees of finger wetness is different, and the change of total current and the change of four sub-currents is a non-linear relationship, the custom polar coordinate system of the four corners used by the capacitive touch screen has no origin on the coordinates, and the controller can not detect and recover after drifting, and after the completion of 4 A/D, the value of the four shunt flows to the X, The process of calculating the Y coordinate value is complex. Since there is no origin, the drift of the capacitive screen is cumulative, and calibration is often required on the job site. The outermost silica protective glass of the capacitive touch screen has good scratch resistance, but it is afraid of the knocking of nails or hard objects, and knocking out a small hole will hurt the interlayer ITO, whether it is injuring the interlayer ITO or injuring the inner surface ITO layer during installation and transportation, the capacitive screen will not work normally.

Lack of accuracy: Due to technical reasons, capacitive touch screens are less accurate than resistive touch screens. Moreover, it can only be typed with your fingers, and it is difficult to recognize more complex handwriting input on a small screen.

The cost will be relatively high: capacitive touch screens will still have certain technical difficulties in the process of attaching the touchpad to the LCD panel.

Kunlun Tongtai touch screen - the advantages and disadvantages of capacitive touch screen

Kunlun Tongtai touch screen - the advantages and disadvantages of capacitive touch screen

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