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Several Technology Analysis of Mainstream Touch Panel

1. Transmittance


The touch panel is attached to the outside of the LCD, so its light transmittance and its anti-glare and anti-reflection characteristics are also relatively important. It is not easy for a capacitive touch panel to achieve high light transmittance and anti-glare. Most touch panels have only 85% light transmittance with poor anti-glare effect.


2. Hardness


The surface layer of the resistive type is made of PET (plastic), and the hardness is usually 3H. The so-called H hardness here is the hardness of our pencils, such as 2B and HB pencils. We all know that pencils are easy to break. In addition, the plastic will become brittle after aging, so the resistive touch panel is easy to damage. It is fine if the resistive type is used in PDA or other personal items, because usually we cherish our own things. However, it is easy to be damaged due to careless use or improper use, which will usually cause maintenance troubles for the manufacturer, not to mention the opportunity lost of customers because of the machine being unusable.


3. Accuracy


Due to the natural physical characteristics of PET, the best accuracy rate of resistive type can only reach 98.5% (that is, the error value is under 1.5%), while the capacitive panel is driven by current, and the accuracy rate can reach 99% (that is, the error value is 1% under). The difference of 0.5% is not obvious in the small size, but when the size is large, the difference of 0.5% may be a malfunction caused by the area of a button.


4. Response time


If it's just a single touch, the reaction time may not be seen important, but if you need to draw a line, such as using a game machine, it is very important. Capacitive touch panel is a timely response, while resistive is a slow sensation and can't keep up with the pace of the game.


5. Touch dotting life


Usually we use the touch point life to express the durability of the touch panel. The capacitive type far exceeds other resistive technologies. The higher the durability of the touch panel, the less maintenance and warranty costs will be required. For consumers, capacitive is a very cost-effective solution.


6. Operating high temperature


As the speed of CPU is getting faster and faster, it is getting hotter and hotter, plus the LCD panel emits heat. The heat dissipation of the entire system is an increasingly important technical issue. The tolerance of the capacitor to high temperature is 20 degrees higher than the resistance, the system design can be more convenient, and can also be used in some special environments.


7. Anti-UV


PET is not UV resistant, so resistive type is not suitable for long-term use outdoors. The capacitive type is not afraid of ultraviolet rays, and coupled with the higher operating temperature than the resistive type, it is more suitable for being expose to the weather outdoors.


8. Starting power


Since the resistive type must be pressed down on the surface of PET to cause voltage drop and generate a touch, the resistive panel must be pressed down to start the resistive panel, sometimes too light a Touch will not be able to drive the resistive panel. Capacitors, however, can form a touch as soon as a hand touches the surface, requiring no force, and are perceived to be more sensitive to the user.


From the above analysis, the capacitive type is far better than the resistive type in terms of light transmittance, hardness, accuracy, response time, touch dotting life, operating high temperature, UV resistance, and initial strength. At present, capacitive panels are the best choice for customers.

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