Behind the Fingertip Revolution: Detailed Explanation of the Smart Terminal Touch Screen
Touch screens are not new. Long before the arrival of this wave of smart phones, you have seen touch screens on various handheld computers, mobile phones, and even black and white screen mobile phones. But in most people's minds, the touch screen of that era always appeared together with the touch pen—you must implement the input command through the touch of a pen or a hard object such as a fingernail. Its essence is “resistive touch screenâ€. . Until the advent of the iPhone in 2007, another type of touch screen, "capacitive touch screen" began to appear in people's attention. However, after 4-5 years of development, the market of touch-type smart terminals has become “the king of the cityâ€, moving from a resistive touch screen to a capacitive touch screen.
â— Resistive Touch Screen The traditional resistive touch screen consists of 5 layers. The finger-touch surface is a hard coating to protect the underlying PET layer (a protective material with good transparency and gas barrier properties). The PET layer is a thin, elastic PET film that bends when the surface is touched and makes the underlying two layers of ITO coating (a nano indium tin metal oxide, which has good conductivity and transparency. ) Touch each other and connect the circuit at this point.
Advantages: The technology is relatively mature, the cost is relatively low, and the surface is not easily affected by dust, water, and dirt.
Disadvantages: The ITO coating in the touch screen is relatively thin and brittle. If it is too thick, it will reduce light transmission and form internal reflection to reduce sharpness. The life of this touch screen is not long-lasting, and it needs to do the position correction of the touch point frequently.
â— Capacitive Touch Screens Capacitive touch screens are classified into two types: Surface Capacitive Technology and Projected Capacitive Technology.
"Surface capacitive touch screen" uses only a single layer of ITO. The electrodes are plated on the four sides of the touch screen to form a low-voltage alternating-current electric field in the conductive body. Compared with the resistive type, the biggest characteristic of the capacitive type is that it does not require pressing, and it only requires touching to input the command.
As for the "projected capacitive touch screen", a thicker overlay can be penetrated without correction. Projected capacitors can do the iPhone's iconic "multi-touch" operation.
Advantages: only need to touch without the need for pressure to generate the signal; only one or no correction is needed after production; the lifetime is longer because the components in the capacitive touch screen do not need to move.
Disadvantages: The cost is relatively high, but with the current selection of capacitive screens for mainstream smart phones, the scale has exploded, and costs have continued to decline.
â— Resistive Touch Screen The traditional resistive touch screen consists of 5 layers. The finger-touch surface is a hard coating to protect the underlying PET layer (a protective material with good transparency and gas barrier properties). The PET layer is a thin, elastic PET film that bends when the surface is touched and makes the underlying two layers of ITO coating (a nano indium tin metal oxide, which has good conductivity and transparency. ) Touch each other and connect the circuit at this point.
Advantages: The technology is relatively mature, the cost is relatively low, and the surface is not easily affected by dust, water, and dirt.
Disadvantages: The ITO coating in the touch screen is relatively thin and brittle. If it is too thick, it will reduce light transmission and form internal reflection to reduce sharpness. The life of this touch screen is not long-lasting, and it needs to do the position correction of the touch point frequently.
â— Capacitive Touch Screens Capacitive touch screens are classified into two types: Surface Capacitive Technology and Projected Capacitive Technology.
"Surface capacitive touch screen" uses only a single layer of ITO. The electrodes are plated on the four sides of the touch screen to form a low-voltage alternating-current electric field in the conductive body. Compared with the resistive type, the biggest characteristic of the capacitive type is that it does not require pressing, and it only requires touching to input the command.
As for the "projected capacitive touch screen", a thicker overlay can be penetrated without correction. Projected capacitors can do the iPhone's iconic "multi-touch" operation.
Advantages: only need to touch without the need for pressure to generate the signal; only one or no correction is needed after production; the lifetime is longer because the components in the capacitive touch screen do not need to move.
Disadvantages: The cost is relatively high, but with the current selection of capacitive screens for mainstream smart phones, the scale has exploded, and costs have continued to decline.
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