Unfixed Polarization Plate Peripheral Edge for LCD Deformation Control
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Solution Overview
Problem
Liquid crystal display devices for portable terminals face issues with brightness non-uniformity due to deformation of configural members, which affects outdoor visibility and safety, as the thinning of these members leads to strength reduction and increased risk of deformation under environmental changes.
Innovation Solution
A liquid crystal display device configuration where the outer peripheral portion of the polarization plate is not fixed to the protection plate or substrate, allowing for absorption of forces that cause thickness increase, thus maintaining a constant distance between substrates and preventing deformation, and incorporating a shatterproof sheet for enhanced safety and visibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If liquid crystal module configural members are thinned to meet demands for thinning and lightweight, then the thickness and weight are reduced, but the strength drops and deformation occurs leading to brightness non-uniformity
Solution Approach 1:
The patent introduces a cushioning member (adhesive layer) between the polarization plate and the color filter substrate to absorb thermal expansion forces before they cause deformation. This beforehand cushioning prevents the brightness non-uniformity that would otherwise occur due to thermal deformation of thinned substrates.
2Length of moving object
If liquid crystal module configural members are thinned to improve thinness, then the module becomes thinner, but deformation occurs under environmental changes causing brightness non-uniformity
Solution Approach 1:
The adhesive layer is positioned beforehand between the polarization plate and color filter substrate to cushion against thermal expansion forces. This maintains dimensional stability of the thinned substrates under environmental temperature changes, preventing brightness non-uniformity.
3Strength
If a protection plate is added to improve strength and safety, then the strength and safety are improved, but brightness non-uniformity occurs in peripheral portions due to polarization plate deformation
Solution Approach 1:
The adhesive layer acts as an intermediary between the polarization plate and the color filter substrate. It mediates the thermal expansion forces, allowing the protection plate to provide strength while preventing the polarization plate from deforming and causing brightness non-uniformity in peripheral portions.
4Stability of the object's composition
If the polarization plate is fixed to the protection plate or substrate, then the structure is more stable, but forces causing thickness increase cannot be absorbed leading to deformation
Solution Approach 1:
The patent applies different fixing characteristics to different regions: the polarization plate is fixed to the protection plate in the central display region for stability, but the adhesive layer is positioned to allow controlled movement in peripheral regions to absorb thermal expansion forces, preventing substrate deformation.
Data Source
AI summary
A liquid crystal display device of the present invention includes: a liquid crystal layer that is held between first and second substrates; an upper polarization plate that is disposed on an outer side of the first substrate; and a protection plate that is fixed to and disposed on an outer side of the upper polarization plate, wherein the upper polarization plate has a structure where an outer peripheral portion of the upper polarization plate is not fixed to the protection plate.