Inline Quality Control of Liquid Crystal Cells
2015 (English)In: IEEE/OSA Journal of Display Technology, ISSN 1551-319X, E-ISSN 1558-9323, Vol. 11, no 12, 1042-1047 p.Article in journal (Refereed) PublishedText
Inline quality control of liquid crystal (LC) cells is usually associated with a real-time noncontact characterization of moved LC cells. Such a characterization enables inspection of the products quality and helps to find in time defects. In the paper, we analyze an approach for fast evaluation of LC cell gap uniformity. The approach is based on detecting interference patterns formed by the quasi-monochromatic light reflected from a tested LC cell. To speed up the data treatment, a simple analytic expression describing the intensity of light interacting with the multilayered structure of an LC cell is derived. The results of the simplified model are compared with rigorous simulations. Two experimental setups are discussed. A CCD camera is used for detecting the interference patterns.
Place, publisher, year, edition, pages
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC , 2015. Vol. 11, no 12, 1042-1047 p.
Liquid crystal (LC) cell gap; quality control; real-time measurements
IdentifiersURN: urn:nbn:se:liu:diva-123326DOI: 10.1109/JDT.2015.2434939ISI: 000364858000012OAI: oai:DiVA.org:liu-123326DiVA: diva2:882208