Application Background
As display designs become more diverse and under-display camera technology matures, punch-hole screens have become an important screen format in the 5G era. Behind this design is a more demanding manufacturing process that requires stable structure, precise dispensing, and accurate inspection.
Punch-hole screens can be manufactured with through-hole or blind-hole processes. Through-hole structures improve front-camera imaging but require more complex processing and stricter quality control. Blind-hole structures keep part of the display layer above the camera area and also place high demands on dimensional and dispensing consistency.
Inspection Challenge
Camera module dispensing around the punched area requires accurate height control, position guidance, and defect detection. Traditional visual or contact methods may struggle with transparent materials, reflective surfaces, and small structural features.
Any deviation in dispensing height or position may affect assembly reliability, sealing quality, optical performance, or product appearance.
Chromatic Confocal Solution
Chromatic confocal sensors provide non-contact micron-level displacement measurement and can adapt to transparent, reflective, and complex material surfaces. They can be used to measure dispensing height, adhesive profile, start and end positions, surface height differences, and structural dimensions around the camera module.
By integrating chromatic confocal measurement into the inspection process, manufacturers can improve dispensing consistency, reduce quality risk, and support stable mass production of punch-hole display camera modules.