Abstract
Light leakage from liquid crystal displays in the dark state is relatively larger and leads to a degraded contrast ratio and color shift. This work describes a novel colorimetric model based on the Muller matrix that includes depolarization of light propagating through liquid crystal molecules, polarizers, and color filters. In this proposed model, the chromaticity can be estimated in the bump and no-bump regions of an LCD. We indicate that the difference between simulation and measurement of chromaticity is about 0.01. Light leakage in the bump region is three times that in no-bump region in the dark state.
Highlights
Many wide viewing-angle LCDs have been investigated and produced
Many conditions result in the light leakage such as light scattering from liquid crystals and the color filter, misalignment of crossed polarizers, and retardation of phase from liquid crystals [8, 9]
This work presents simulation and measurement results for a LCD module in the dark state, which demonstrate that a minimum difference exists in chromaticity, and light leakage in the bump region is three times larger than in no-bump region
Summary
Many wide viewing-angle LCDs have been investigated and produced. In-Plane Switching (IPS) [1, 2] and Multidomain Vertical Alignment (MVA) [3,4,5] are widely used for highend LCD products. Many conditions result in the light leakage such as light scattering from liquid crystals and the color filter, misalignment of crossed polarizers, and retardation of phase from liquid crystals [8, 9]. Investigating the colorimetric and photometric characteristics of LCDs, which include their major optical components, such as crossed polarizers, liquid crystals, color filters, and backlight modules, is interesting [12,13,14]. In this colorimetric model based on the Muller matrix, the transmission spectrum of each component is imported and the light scattering from liquid crystals is ignored. This work presents simulation and measurement results for a LCD module in the dark state, which demonstrate that a minimum difference exists in chromaticity, and light leakage in the bump region is three times larger than in no-bump region
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