What is a touch panel?

The touch panel is also called a touch screen. Any screen that the electronic device that you see can realize human-computer interaction is basically a touch screen technology, and also a touch panel. It makes a simple and convenient way of human-computer interaction, bringing convenient interactive devices to everyone's life and work.

The touch panel was first introduced in 1965 by E.A. Johnson, a short article describing the capacitive touch screen, and then in 1967, published an article with a truth. In 1970, two transparent engineers, invented by two engineers at the CERN (European Council for Nuclear Research) in the early 1970s, were put into use in 1973. Then in 1975, an American George Samuel Hurst invented the resistive touch panel and obtained the US patent (#3, 911, 215), and commercialized in 1982.



1. Technical points of the touch panel:

From the technical point of view, the touch screen is a transparent absolute positioning system. Firstly, it must be transparent. Secondly, it is absolute coordinates. Where is the finger touch? It is not like the mouse needs a cursor for relative positioning, so it is very It's easy to distract, because you have to pay attention to where the cursor is.

The structure is usually covered on a semi-reflective liquid crystal panel (ITO transparent conductive electrode), which is highly sensitive to pressure. When an object is pressed on it, a current signal is generated and a pressure source is determined. Location and dynamic tracking. This is the on-cell technology that we report in the media. Now, the In cell Touch touch component is integrated into the display panel, so that the panel itself has a touch function, and the touch effect and application can be achieved without the need for additional bonding and assembly with the touch panel, mainly Apple is researching.

Next, we mainly introduce the differences and principles of different touch technologies from transparency and positioning methods.

2. Classification and principle of touch panel:

From the technical principle to distinguish the touch screen, it can be divided into five basic categories: vector pressure sensing technology touch screen, resistance technology touch screen, capacitive touch screen, infrared technology touch screen, surface acoustic wave technology touch screen. Among them, the vector pressure sensing technology touch screen has withdrawn from the historical stage; the infrared technology touch screen is inexpensive, but its outer frame is fragile, easy to produce light interference, and the surface is distorted; the surface acoustic wave touch screen almost solves all kinds of defects of the touch screen, clear and not It is easy to be damaged and suitable for various occasions. The fatal disadvantage is that if there are water droplets and dust on the surface of the screen, the touch screen will become dull or even not working, so it is difficult to popularize.

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