Method and device for measuring cell gap of liquid crystal display using near-IR radiation

Abstract

A method and device for measuring cell gap of a liquid crystal display, the display comprising a pair of substrates with electrodes adhered together forming a predetermined sized cell gap. The device and method includes radiating near-infrared light toward the liquid crystal cell, reflectively interfering the near-infrared light by the cell gap, and analyzing the interference waveform to compute the cell gap size. The device may include an X-Y stage, an FT-NIR spectroscope using near-infrared light as light source, a detector unit for detecting reflected interference light from the liquid crystal cell, and an analyzing computer unit for analyzing and computing cell gap by performing Fourier transformation method or maximum entropy method (MEM) to the interference fringe spectrum.

Dependencies are inferred from the claim text.