Evaluation of TN-LCD by ellipsometry

Abstract

After filling the Liquid Crystal into the Liquid Crystal Display(LCD), the cell gap may be changed by the capillary attraction. That's why the way to measure the actual cell gap has been eagerly required. Nowadays, an optical measurement technique such as ellipsometry was applied to investigate the characteristics of LCD. We demonstrate a new application to evaluate the actual cell gap by using ellipsometry. By measuring the ellipsometric parameters Δ and φ, and fitting numerical calculation based on the 4 × 4 matrix method, it, is found that the actual cell gap can be evaluate quantitatively.