What Tests Do Capacitive Touch Screens Need To Go Through Before They Go Out Of The Factory?

- May 30, 2019-

Along with the development of the mobile Internet and city information, the application range of the touch screen is more and more widely, in addition to the industrial use of the operation of the plant and equipment control system, and also in people life contact use almost every day, from all the commonly used PAD, TablePC, mobile phones, cameras, video players and other personal items, to today's public information query equipment, adopt the touch screen.

In addition to dust, ash and abrasion resistance, capacitive touch screens are very suitable for the use of electronic products and other characteristics. Moreover, they have the characteristics of further optimizing the user experience for their products. First of all, capacitive touch screens support multi-touch control, which makes people feel novel about the operation of electronic products.Secondly, as the capacitive touch screen only induces human current, it can basically avoid the possibility of other objects being touched by mistake.Therefore, the development prospect of capacitive touch screen is very optimistic.

As a leading high-tech enterprise of capacitive touch screen research, development, production, design and sales in China, we would like to briefly introduce the reliability test of capacitive touch screen to ensure its product quality and reliability.

The static characteristics of the sensor mainly include linearity, hysteresis, repeatability, sensitivity, resolution, threshold, stability, drift, etc., among which linearity, sensitivity, hysteresis and repeatability are four important indicators.

1. Linearity

The linearity of a sensor is the degree of linearity of the quantitative relationship between the output and input of the sensor.

2. Sensitivity

Sensitivity is an important index of sensor static characteristics.It is defined as the ratio of the output increment to the corresponding input increment that causes the output increment.

3, hysteresis

The phenomenon that the input and output characteristic curves of the sensor do not coincide during the change of input quantity from small to large (positive stroke) and input quantity from large to small (reverse stroke) is called hysteresis.

4. Repeatability

Repeatability refers to the degree to which the characteristic curve of the sensor is inconsistent when the input varies continuously in the same direction for many times in the full range


Resolution is used to represent the ability of a sensor or instrumentation device to detect small variations being measured, usually expressed in units of small ranges.

6, drifting

Sensor drift refers to the phenomenon that the output of the sensor changes with time when the input remains unchanged

7. Stability

Stability is divided into short-term stability and long-term stability. For a sensor, long-term stability is often used to describe its stability, that is, the ability of the sensor to maintain its performance over a long period of time.

8, the threshold

Threshold refers to the small measured input value when the sensor produces measurable output variation.

Another is to see the use of the touch screen and the working environment needs to test the high temperature and low temperature.