The durability test of resistive touch TFT screens is a key step in evaluating their long-term reliability. It requires simulating various stresses during daily operations and covers three major categories of test items: mechanical wear, environmental adaptability, and electrical performance stability.

Mechanical wear testing is the core, which simulates the repeated touch of fingers or styluses through a wear resistance testing machine. The test standards typically require that the touch function be tested at the center and four corners of the screen with a pressure of 50-100g and a frequency of 1-3 times per second. The cumulative number of clicks should reach over 1 million times (5 million times for industrial-grade products). After the test, it is necessary to ensure that the touch function is normal, without local failure or response delay.

The resistance change rate of the conductive layer does not exceed 20%. The sliding test involves reciprocating sliding on the screen surface under the same pressure. After a cumulative distance of 100 kilometers, there are no obvious scratches on the surface (hardness is tested with a 3H pencil), and the light transmittance does not decrease by more than 5%.

Environmental adaptability testing includes high and low temperature cycling, humidity testing and vibration testing. The high and low temperature test was conducted 50 times within the range of -20 ℃ to 60℃, with each cycle lasting for 2 hours.

After the test, there were no bubbles or delamination on the screen, and the touch response was normal. The humidity test was conducted in an environment with 95% RH (40℃) for 1000 hours to ensure that the conductive layer did not oxidize and the resistance remained stable.

The vibration test simulates the vibration during transportation or use. It is conducted at a frequency of 10 to 2000Hz for one hour. There is no loosening of any component and the function is not affected.

Electrical performance testing requires continuous monitoring of signal stability after long-term use. After continuous operation for 1000 hours, the offset of touch coordinates should be controlled within ±1mm, with no drift phenomenon, to ensure the usage requirements of high-precision scenarios such as industrial control.