Liquid Crystal Display Adhesive Layer Thickness Control
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Solution Overview
Problem
In liquid crystal display devices, reducing the thickness of substrates and adhesive layers to minimize display non-uniformities and enhance three-dimensional image definition leads to non-uniformities in the cell gap between substrates, causing display issues.
Innovation Solution
A liquid crystal display device design with a first and second light-transmitting substrate, a thin adhering layer, and a polarizing plate, where the adhesion parameter is controlled by the thickness of the adhering layer, storage modulus, and loss tangent, and the maximum height of the polarizing plate's surface unevenness is minimized to maintain uniform adhesion and reduce display non-uniformities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the thickness of the lens sheet, substrate, and adhesive layer are reduced to increase three-dimensional image definition, then the gap between pixels and lens sheet is narrowed improving definition, but non-uniformities occur in the cell gap causing display non-uniformities
Solution Approach 1:
The invention changes the physical parameters of the adhesive layer by controlling its thickness to 0.15 mm or less and specifying storage modulus (1.0×10^5 Pa or greater at 80°C) and loss tangent (0.6 to 1.5 at 1 Hz, 20°C) within particular ranges. These parameter adjustments allow the adhesive layer to maintain uniformity while enabling thinner overall structure for improved three-dimensional image definition.
Solution Approach 2:
The invention applies different property requirements to different components: the adhesive layer requires specific viscoelastic properties (storage modulus and loss tangent) to maintain uniformity, while the lens sheet and substrates are optimized for thickness to improve definition. This localized optimization of properties resolves the contradiction between thinness and uniformity.
2Length of stationary object
If the thickness of the adhesive layer is reduced to minimize device thickness, then device thickness is reduced, but non-uniformities in cell gap increase causing display non-uniformities
Solution Approach 1:
The invention reduces adhesive layer thickness to 0.15 mm or less while compensating by optimizing the viscoelastic parameters (storage modulus and loss tangent) to ensure uniform adhesion. This parameter optimization allows thinning without sacrificing display uniformity.
Solution Approach 2:
The adhesive layer functions as a composite material system where both thickness and material properties (storage modulus and loss tangent) are controlled together. This composite approach allows the layer to be thin while maintaining sufficient mechanical performance for uniform adhesion.
3Manufacturing precision
If the thickness of substrates and adhesive layer are reduced to enhance three-dimensional image definition, then definition is improved, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The invention specifies particular parameter ranges for the adhesive layer (thickness ≤0.15 mm, storage modulus ≥1.0×10^5 Pa at 80°C, loss tangent 0.6-1.5 at 1 Hz/20°C) that balance manufacturing feasibility with performance. These parameter guidelines make thin-film manufacturing more controllable despite the reduced thickness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The controlled adhesion parameter and surface unevenness suppress display non-uniformities, allowing for thinner device thickness and improved three-dimensional image definition while maintaining uniformity and stability.
Implementation Method 1
an adhering layer provided on the first main surface of the first polarizing plate; and a second light-transmitting substrate that is adhered to the first main surface of the first polarizing plate by the adhering layer
Implementation Method 2
a first liquid crystal sandwiched between the first light-transmitting substrate and the substrate
Data Source
AI summary
A liquid crystal display device includes a first liquid crystal display panel including a first light-transmitting substrate (thickness T2≤0.3 mm), a substrate, a first liquid crystal, a first polarizing plate having a second main surface that is adhered to the first light-transmitting substrate; an adhering layer provided on a first main surface of the first polarizing plate; and a second light-transmitting substrate (thickness T3≤0.3 mm) adhered to the first main surface by the adhering layer (thickness T1≤0.15 mm). An adhesion parameter α is 1.04 or less when a maximum height of an unevenness of the first main surface 0.0005 mm or less, and the adhesion parameter α is 0.43 or less when the maximum height of the unevenness of the first main surface is greater than 0.0005 mm and 0.001 mm or less.