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How to Choose Industrial Display Correctly

Release time:2022-11-09 Hit:704


1、 Performance comparison of industrial touch screens:


1. Capacitive touch screen


Capacitive touch screens have high resolution and good light transmittance, which can meet various requirements well. This type of touch screen is commonly seen in public places. However, capacitive touch screens use the human body as an electrode of a capacitor. When a conductor approaches and couples a sufficiently large capacitance with the interlayer ITO working surface, the flowing current will cause the capacitive touch screen to malfunction; In addition, there is no response when touching gloves or holding insulated objects, which is due to the addition of insulating media.

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2. Resistive touch screen


The resistive touch screen operates in an environment completely isolated from the outside world. It is not afraid of dust, moisture, and oil stains and can be touched with any object, making it more suitable for use in the industrial control field. The disadvantage is that the outer layer of the composite film is made of plastic, and using too much force or sharp objects to touch may scratch the touch screen.


3. Infrared touch screen


The infrared touch screen determines the touch position by measuring the on/off of infrared radiation, regardless of the material of the transparent baffle selected for the touch screen. Therefore, selecting a baffle with good light transmission performance and applying anti reflective treatment can achieve a good visual effect. However, due to the volume limitation of the infrared emission tube, it is impossible to emit high-density infrared, so the resolution of this type of touch screen is not high. In addition, due to the fact that infrared touch screens rely on infrared sensing for operation, changes in external light such as sunlight or indoor lights can affect their accuracy.


4. Surface acoustic wave touch screen


Surface acoustic wave technology is very stable, and the controller of the surface acoustic wave touch screen calculates the touch position by measuring the position of the attenuation time on the timeline, so its accuracy is very high. The surface acoustic wave touch screen also has a third axis (z-axis), which is the pressure axis - the magnitude of the user's touch screen force can be obtained by calculating the attenuation at the received signal attenuation point, which can be divided into up to 256 levels of force. The greater the power, the wider and deeper the attenuation gap on the received signal waveform. Among all touch screens, only surface acoustic wave touch screens have the ability to perceive touch pressure.


2、 How to choose an industrial touch screen correctly? Here are a few suggestions provided by the editor for your reference:


1. Recognizing needs


Generally, touch screens from top international brands have a relatively affordable price range and can only be used for their own brand products, or even some series of their own brand products. They cannot adapt to devices from other brands on the market, so it is advisable to choose devices with strong adaptability.


2. Consider budget


There are many touch screen brands in the domestic market, with three levels: high, medium, and low. Among them, there are international first tier brands with excellent quality, as well as affordable domestic brands. If the budget is sufficient, big brands can be considered first.


If the budget is limited, the required touch screen will only be used for display purposes, and control inputs are not often made. So you can choose some domestic brands with relatively low prices.


3. Check performance and certification


Check if there are domestic and foreign certifications, and it is recommended to try them out or find a dedicated person or device to test their performance.


4. Compare reflective performance


Mainly refers to the overlapping light and shadow on the image caused by mirror reflection, such as shadows, windows, lights, etc. Reflectivity is a negative effect brought by touch screens, the smaller the better. It affects the user's browsing speed. Touch screens are an absolute coordinate system, and you can click directly on which one to choose. The essential difference between them and relative positioning systems like mice is the intuitive nature of being in place at once.


5. Look at absolute coordinates


Its characteristic is that each positioning coordinate has no relationship with the previous positioning coordinate. The touch screen is an independent coordinate positioning system in physics, and the data of each touch is converted into the coordinates on the screen through calibration data. Therefore, it is required that the output data of the same point on the touch screen is stable regardless of the situation. If it is unstable, the touch screen cannot guarantee absolute coordinate positioning, and the point is inaccurate, This is the most feared issue for touch screens. Detecting touch and positioning, various touch screen technologies rely on their own sensors to work, and even some touch screens themselves are a set of sensors. The respective positioning principles and sensors used determine the response speed, reliability, stability, and lifespan of touch screens.


6. Compare transparency


Transparency, which directly affects the visual effect of the touch screen, can only be referred to as the average transparency in the picture, of course, the higher the better.


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