New online static measurement method for panel and touch screen industry

Static electricity has always been a concern of the semiconductor and panel industries. The electrostatic discharge and adsorption caused by static electricity will cause component damage and affect the yield of production products.
Take the panel industry as an example. During the manufacturing process, glass panels are constantly being rubbed, moved, adsorbed, pressurized, separated, heated, cooled, etc. to generate static electricity. Under certain circumstances, electrostatic discharge will occur. Due to the large panel size, high integration, uneven static electricity distribution, narrow test space, and long test distance, it is difficult for traditional handheld electrostatic field testers to measure accurate electrostatic voltage values and cannot meet the current panel technology testing requirements.
Therefore, Weili introduced a brand-new online electrostatic detection equipment from Hanwa of Japan (as shown in Figure 1). It uses a multi-point detection probe to display electrostatic data in real time using three modes: numerical, visual, and graphs. Functional testing solutions.


Figure 1 Online static test equipment
Using this equipment, we have carried out relevant tests in different process sections of the panel industry, and obtained the original data and visual images with the supporting software (as shown in Figures 2 and 3).


Figure 2 Original Excel data (showing the amount of static electricity corresponding to different test points)


Figure 3 Visual image (different test points show the amount of static electricity by color shade)
In the entire panel transfer process, through post-data and image analysis, we can find the changes in the surface static electricity of the panels in different links. According to the specific change rules and data comparison, we have more methods to discover and improve the potential hazards of production (as shown in the figure). 4).


Figure 4 post-data analysis (display panel changes in the amount of static electricity of the entire glass during the transfer process)
We can use the information generated by this new system to analyze whether the machine grounding is good in the process, whether the anti-static effect of the roller and thimble is as expected, whether the ion bar installation position, angle, and height are appropriate to determine the various anti-static measures to be taken. Whether electrostatic means are effective.