Whether it is mobile phones, computers, digital products are moving towards the touch screen, and the commonly used touch screens are nothing more than capacitive screens and resistive screens. What are the advantages and disadvantages of the two?
Capacitive screen:
The capacitive touch screen is a four-layer composite glass screen. The idea is excellent and simple, but there is an insurmountable problem: the transparent conductive material ITO (oxidized metal) is very fragile, it will be damaged after a few touches and can not be used directly as a working layer. It is necessary to add a very thin layer of hard glass to the outside.
This layer of glass is obviously non-conductive, DC conduction is not enough, use high-frequency AC signal, rely on the coupling capacitance formed by the human finger (via thin glass) and the working surface to absorb an AC current, which is the capacitor The origin of the screen "capacitor" name: work by coupling capacitors.
Disadvantages:
1. Unstable. The way of coupling the capacitor is directly affected by temperature, humidity, finger wetness, body weight, and dryness of the ground. The interference from large external objects is also very large, resulting in unstable results.
2. The defective rate is higher than the resistance screen. The outermost layer of extremely thin glass, the scratch-resisting performance is very good under normal conditions, but the process is required to be manufactured under vacuum. This extremely thin glass has a 5% probability of hitting a product with a hole.
3, the service life relative to the resistance screen is generally short (resistance screen 3 years, capacitive screen 2 years).
advantage:
Transmittance and clarity are superior to resistive screens.
Resistive screen:
The screen part of the resistive touch screen is a multi-layer composite film which is very compatible with the surface of the display. The film consists of a layer of organic film as the base layer, and the surface is coated with a transparent conductive layer, which is covered with a surface to be hardened and smoothed. The scratch-resistant plastic layer is also coated with a transparent conductive layer on its inner surface. There are many fine (less than 0.0254 mm) transparent isolation points between the two conductive layers to insulate them.
advantage:
1. The screen and control system are relatively cheap, the reaction sensitivity is also very good, the working environment completely isolated from the outside world, not afraid of dust and water vapor, can adapt to various harsh environments. It can be touched with any object and has better stability.
2. The service life is relatively long.
Disadvantages:
1. Resistive touch screen requires a certain pressure, which is prone to wear of surface materials and affects the normal service life of the product.
2. Resistive touch screen, its sensitivity is not easy to adjust, easy to appear sensitivity imbalance, A point sensitive, B point slow phenomenon often occurs
3. Resistive touch screens have weaker ability to deal with interference and have poor ability to prevent malfunctions. Anything that happens will cause an action
Capacitive screen:
The capacitive touch screen is a four-layer composite glass screen. The idea is excellent and simple, but there is an insurmountable problem: the transparent conductive material ITO (oxidized metal) is very fragile, it will be damaged after a few touches and can not be used directly as a working layer. It is necessary to add a very thin layer of hard glass to the outside.
This layer of glass is obviously non-conductive, DC conduction is not enough, use high-frequency AC signal, rely on the coupling capacitance formed by the human finger (via thin glass) and the working surface to absorb an AC current, which is the capacitor The origin of the screen "capacitor" name: work by coupling capacitors.
Disadvantages:
1. Unstable. The way of coupling the capacitor is directly affected by temperature, humidity, finger wetness, body weight, and dryness of the ground. The interference from large external objects is also very large, resulting in unstable results.
2. The defective rate is higher than the resistance screen. The outermost layer of extremely thin glass, the scratch-resisting performance is very good under normal conditions, but the process is required to be manufactured under vacuum. This extremely thin glass has a 5% probability of hitting a product with a hole.
3, the service life relative to the resistance screen is generally short (resistance screen 3 years, capacitive screen 2 years).
advantage:
Transmittance and clarity are superior to resistive screens.
Resistive screen:
The screen part of the resistive touch screen is a multi-layer composite film which is very compatible with the surface of the display. The film consists of a layer of organic film as the base layer, and the surface is coated with a transparent conductive layer, which is covered with a surface to be hardened and smoothed. The scratch-resistant plastic layer is also coated with a transparent conductive layer on its inner surface. There are many fine (less than 0.0254 mm) transparent isolation points between the two conductive layers to insulate them.
advantage:
1. The screen and control system are relatively cheap, the reaction sensitivity is also very good, the working environment completely isolated from the outside world, not afraid of dust and water vapor, can adapt to various harsh environments. It can be touched with any object and has better stability.
2. The service life is relatively long.
Disadvantages:
1. Resistive touch screen requires a certain pressure, which is prone to wear of surface materials and affects the normal service life of the product.
2. Resistive touch screen, its sensitivity is not easy to adjust, easy to appear sensitivity imbalance, A point sensitive, B point slow phenomenon often occurs
3. Resistive touch screens have weaker ability to deal with interference and have poor ability to prevent malfunctions. Anything that happens will cause an action
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