Liquid Crystal Display Polarizing Plate Moisture Control
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Solution Overview
Problem
Liquid crystal display devices with thin glass substrates experience warp unevenness and light leakage due to differences in contractile forces between polarizing plates when stored in high-humidity environments, leading to bending issues after storage.
Innovation Solution
The liquid crystal display is configured with polarizing plates having specific moisture content differences and low moisture-permeable layers to minimize contractile force disparities, using thermoplastic resin films and polyester-based resins, and refractive index equations to control panel bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the glass substrate thickness is decreased to reduce weight, then the weight decreases, but the panel becomes more susceptible to bending and warp unevenness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the moisture content of the polarizing plate to within ±3.0% or ±1.5% of its average value. This parameter control prevents excessive contractile force generation during humidity changes, thereby maintaining panel stability even with thin glass substrates (0.5mm or less) that are more susceptible to bending.
2Illumination intensity
If the polarizing plate is positioned under high-temperature environment, then the color unevenness is enhanced, but the contractile force increases causing panel bending
Solution Approach 1:
The patent controls the moisture content parameter of the polarizing plate to remain within specific ranges (±3.0% or ±1.5% of average) even after high-temperature storage at 60°C for 48 hours. This parameter control allows the polarizing plate to maintain both color uniformity and dimensional stability, preventing panel bending while achieving the desired optical performance.
Data Source
AI summary
There is provided a liquid crystal display including: a liquid crystal cell in which a liquid crystal layer is installed between two glass substrates; polarizing plates on both surfaces of the liquid crystal cell; and a backlight at a rear side of the liquid crystal cell, which is a non-visual side, wherein in a polarizing plate at a front side of the liquid crystal cell, which is a visual side, a difference in a moisture content of the polarizing plate at the front side under a specific condition in elapse of time is 0.01% or more and 3.0% or less.