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Say something about Touch panel

2019-04-24

What is a touch panel?

The touch panel, also known as Touch Screen, is widely used on electronic devices.

With a touch screen, you can remove the boring keyboard, which provide a simple, convenient and natural human-computer interaction. It gives multimedia a new look and is an attractive new multimedia interactive device.

The touch panel was first introduced in 1965 with a short article describing the capacitive touch screen.

then in 1967, there was an article with a truth 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.

1, It must be transparent.

2, It is absolute coordinates.

Where is the finger touch? Not like the mouse needs a cursor for relative positioning, it's easy to distract.

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. Five kinds 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 technology 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Among them, the vector pressure sensing technology touch screen has withdrawn from the historical stage; the infrared technology touch screen is inexpensive, but its outer frame is fragile, easy to produce light interference, and the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.

Let us mainly talk about resistive and capacitive touch:


Resistive: controlled by pressure.

Because the resistive screen is controlled by pressure, it does not have to be controlled by hand. Pens, credit cards, etc. can be operated. Even if it is worn, it does not matter, and it is isolated from the outside world, so it has the advantage of dust and dirt; If the "touch" is too light, the resistive screen will not respond, so you should use a light stamp. The resistive screen has low cost and low technical threshold. Moreover, when the resistive touch screen is operated, it needs to be tapped, so it is easy to be bad, and the sensitivity is not so good, and the drawing and writing are not smooth.


Capacitive: Enjoy light and smooth!

However, what really brings the trend of smartphones is the capacitive touch screen, which consists of a glass substrate coated with a conductive film on both sides, and is covered with a thin layer of SiO2 dielectric on the upper plate. As shown in the figure, the upper electrode is used to form a plate capacitance sensing capacitance change with the human body (ground), and the lower plate is used to shield external signal interference.



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