Bilayer synchronous measuring method of curved screen based on a line-structured light-scanning sensor

Curved screens are widely used in smart wearables, optics, aerospace, and other display fields. To overcome the difficulty of overall quality evaluation of large-area curved screens, this paper proposes a novel measuring method to realize the bilayer synchronous measurement based on line-structured light scanning. The integrated shape information of the large bilayer curved screen can be obtained by only a single probe in one scanning step. The two-step image processing in the image and three-dimensional data space is proposed to reduce the noise due to the weak reflection from the bilayer screen. To realize the large-area curved screen measurement, a splicing algorithm based on the optimization principle is also proposed to rectify the position deviation of each splicing step. A curved mobile phone screen was measured, and the experimental results effectively proved the validity of the proposed method. A camera lens was also measured to prove its potential for other multilayer parts.