P.45: The Study of LCD Module Assembly Mura

Abstract

The direct mechanical touching usually generates mura on a LCD panel. The touch mura cannot always be flashed in a very short period. Touch mura exists in almost every mode of LCD. In this paper, a new type of mura which generated during the LCD module assembly process is investigated. The research results show that LC orientation change from original alignment direction is the main driving‐force of light leakage. A solution to prevent this type of mura is proposed for industrial manufacturing process.

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

“…6) Product reliability concerns have stimulated significant interest in stress characteristics and their impact on durability and reliability of LCDs. The effect of stress on light leakage phenomenon has been explained with numerous mechanisms including thermally induced light leakage due to phase retardation of liquid crystal (LC), 1) polarizer shrinkage induced bending of poly(vinyl alcohol) (PVA) absorption axis, 7) warpage of LCD panel, 8,9) disturbed orientation of LC due to stress, 10) and thermal stress on glass due to nonuniform temperature distribution. 11,12) Recently, three-dimensional (3D) finite element analysis (FEA) has been employed to analyze the probable causes for light leakage.…”

P‐103: Improvement of Dark State Light Leakage in ADS Mode LCDs

“…Chi-Chen Huang and others thought the main light leakage of edge type Mura came from stress distribution of glass which was contributed from inplane non-uniform temperature distribution [1]. For IPS/FFS/ADS mode, John Z. Liang and others thought the light leakage was caused by liquid crystal's orientation [2]. Our team did some simulation before and thought the main cause of light leakage was the combination of glass retardation induced by internal stress in the panel and ADS mode [3].…”