Programming and Verification of an Optical Measurement System for LCD Cells
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چکیده
A LCD (Liquid Crystal Display) consists of two glass substrates glued together with a small gap (called cell gap) in-between them. The gap is filled with a liquid crystal. To produce a display with good viewing characteristics it is very important that this gap, and other parameters, gets the right dimension. There are formulas that can be used to calculate which cell gap that is appropriate in which application. The problem is that it does not exist any realized methods that can measure the parameters of the LCD cell to decide if the LCD is useful or not in an early state of the production. A number of theories has been presented on how to measure and calculate these parameters but no really working systems has been presented. This Master ́s thesis describes how such a system can be implemented. The system is based on the theories of S Valyukh of the Swedish LCD center and it is using a modified version of the Nelder-Mead Simplex Algorithm. The tests done in this paper indicates that the system has the potential to be commercially useful. However more extensive tests and some modifications must be carried out before it can be really useful. Programmering och verifikation av optiskt mätverktyg för LCD-celler Sammanfattning En LCD (Liquid Crystal Display, flytande kristalldisplay) består av två ihoplimmade glasskivor med ett litet mellanrum (kallas för cellgap) mellan dem. Cellgapet fylls med en flytande kristall. För att tillverka en display med bra egenskaper är det viktigt att cellgapet, och några andra parametrar, får rätt dimension. Det finns formler som kan användas till att beräkna den optimala storleken på cellgapet för en specifik applikation. Problemet är att det inte finns några realiserade metoder som kan mäta och kontrollera parametrarna hos en LCD-cell och på så vis kunna godkänna eller förkasta den i ett tidigt skede av produktionen. Ett antal teorier har presenterats för hur man skulle kunna mäta och beräkna dessa parametrar men inget praktiskt fungerande system. Detta examensarbete beskriver hur ett sådant system skulle kunna implementeras. Systemet baserar sig på teorier från S Valyukh från Swedish LCD center och använder en modifierad version av Nelder-Meads simplexalgoritm. Det test som gjort i denna rapport indikerar att systemet har potential att kunna bli kommersiellt användbart. För att nå dit kommer det emellertid att krävas mer utförliga tester samt att några modifieringar görs.
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