RTP VS CTP, Which One Is Better

In this digital age, touch screen technology has become a very important part of our life and work. The most widely used are RTP (Resistive Touch Panel) and CTP (Capacitive Touch Panel). 

RTP (Resistive Touch Panel) is also known as soft screen, composed of glass, film and two ITO conductive layers, which are formed by coating with ITO on both two sides between the glass and film. When the touch screen is contacted and applied a certain pressure, the upper ITO conductive layer will undergo deformation and thus contact with the lower ITO layer, resulting in changes in resistance, which will be detected by the sensors located at the edge of the screen, and then through the horizontal and vertical coordinates to find out the exact location to indicate the touch point. 



CTP (Capacitive Touch Panel), also known as hard screen, is a four-layer composite glass screen. The first layer is ITO layer, playing the role of shielding the internal electrical signals; the second layer is glass; the third layer is also ITO layer, used as working surface; the fourth layer is a protective layer of silica glass. When the finger touch the screen, as the human body itself with a load, there will be a coupling capacitance between the finger and the screen. It means forming a conductor at the contact point. The finger will absorb a very small current from the contact point, and this current will outflow from the four corners of the touch screen electrode. The current flowing through these four electrodes is proportional to the distance from finger to the four corners. Then the controller can locate the touch point by precisely calculating the proportion of these four currents.



Both RTP (Resistive Touch Panel) and CTP (Capacitive Touch Panel) have their own advantages and disadvantages, and therefore have different applications. RTP has advantages of low cost, high accuracy, accurate response to finger (including gloves) or stylus operation, complete isolation from the outside, not afraid of dust and water vapor, can adapt to a variety of harsh environments. And the disadvantages are that the multi-layer structure will lead to greater light loss and poor light transmission for hand-held devices, and RTP can only support a single-point touch. Therefore, RTP is commonly used in the fields of industrial control, self-service terminals, and medical equipment. These areas have certain requirements for cost control, touch accuracy and stability. CTP support multi-touch, can recognize multiple touch points to provide users with a richer interactive experience, and has a high light transmittance that can present a clear and bright image; the disadvantage are that the manufacturing cost is high, and it is susceptible to changes of temperature, humidity, electric field and others. CTP dominates in the field of smart phones, tablet PCs, high-end electronic devices and so on.


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