Effects of thermomechanical properties of polarizer components on light leakage in thin-film transistor liquid-crystal displays

Abstract

In this paper, we present static thermal analysis of stress and strain on a thin-film transistor liquid-crystal display (TFT-LCD) panel and their correlation with light leakage phenomena under high-temperature durability test. Three-dimensional (3D) finite element analysis (FEA) is coupled with experimental parameters of key components of the TFT-LCD panel for the analysis. A strong correlation exists between light leakage and retardation difference induced by stress on triacetyl cellulose (TAC) films. Moreover, shrinkage in stretched poly(vinyl alcohol) (PVA) film and modulus of the adhesive layer are key factors affecting stress distribution and displacement of polarizer stack. An increase in Young's modulus (E) of the adhesive layer effectively reduces polarizer shrinkage and light leakage at the center of the panel. A TAC film with lower Young's modulus and/or coefficient of thermal expansion (CTE) is also an effective solution.

Analyzing the effect of temperature on optical performance of dual‐layer liquid crystal displays

“…The effect of temperature on optical performance of LCDs has been widely studied. For a single‐layer LCD, display defects such as light leakage 9–11 and color distortion 12,13 occur under the influence of temperature. For an LCD bonded with a touch glass or reflection‐reduction glass, the display defects caused by temperature are also analyzed, 14,15 such as the yellow border defect at high temperatures 16 .…”

Novel Photoalignment Method Based on Low-Molecular-Weight Azobenzene Dyes and Its Application for High-Dichroic-Ratio Polarizers

“…Furthermore, there is a serious concern with using conventional polarizers in thin and flexible displays. The shrinkage force generated in the stretching process will cause panel bending and display distortion when there is little rigid support in the device . Therefore, a novel technique capable of producing an ultrathin polarizer without this shrinkage issue is highly anticipated for ultrathin and flexible displays.…”