Window Substrate Light-Shielding Pattern Viscoelasticity Control
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Solution Overview
Problem
Current display devices face challenges in achieving a flexible, thin-layered structure with improved mechanical reliability due to defects and increased process costs when stacking multiple layers, such as polarizing plates and touch screen panels, on display panels.
Innovation Solution
A window substrate is designed with a base substrate, a light-shielding pattern, adhesive layers, a polarizing layer, and a touch sensor layer, where the viscoelasticity ratio and thickness ratio of the light-shielding pattern to the adhesive layer are controlled within specific ranges to prevent bubble generation and enhance adhesion and flexibility, allowing for a more reliable and flexible structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple layers (polarizing plate, touch screen panel, window substrate) are stacked on the display panel, then protection and functionality are improved, but device thickness increases and flexibility deteriorates
Solution Approach 1:
The patent combines the polarizing plate and touch screen panel into a single integrated window substrate structure. The polarizing layer is formed directly on the adhesive layer that bonds to the touch sensor layer, eliminating the need for separate polarizing plate and touch screen panel components while maintaining all necessary functions.
Solution Approach 2:
The window substrate serves multiple functions simultaneously: it acts as a protective cover, a polarizing element, and a touch sensor substrate. The integrated structure performs protection, light polarization, and touch sensing functions in a single component, reducing overall device thickness while improving flexibility.
2Reliability
If multiple layers are stacked on the display panel, then functionality is improved, but manufacturing defects increase and process cost increases
Solution Approach 1:
The patent merges multiple manufacturing processes into fewer steps by integrating the polarizing plate and touch screen panel fabrication. The polarizing layer is formed directly on the adhesive layer in the same process sequence used for touch sensor fabrication, reducing the number of separate lamination and alignment operations required.
3Stability of the object's composition
If the light-shielding pattern has high viscoelasticity ratio relative to adhesive layer, then structural stability is improved, but bubble generation occurs and adhesion deteriorates
Solution Approach 1:
The patent optimizes the viscoelasticity ratio of the light-shielding pattern relative to the adhesive layer to be 75,000 or less. This parameter control prevents excessive rigidity that would cause bubbling during adhesive application while maintaining sufficient structural stability. The controlled viscoelasticity allows the light-shielding pattern to flex slightly during manufacturing processes, ensuring complete adhesive coverage without trapped bubbles.
4Object-affected harmful factors
If the light-shielding pattern has large thickness relative to adhesive layer, then light-shielding performance is improved, but flexibility deteriorates and delamination occurs during bending
Solution Approach 1:
The patent controls the thickness ratio of the light-shielding pattern relative to the adhesive layer to be 0.6 or less. This thickness optimization maintains adequate light-shielding performance while ensuring the overall structure remains flexible enough to bend without causing delamination between layers. The controlled thickness allows the integrated window substrate to conform to curved surfaces and withstand flexing operations.
Data Source
AI summary
A window substrate includes a base substrate including a display region and a non-display region, a light-shielding pattern disposed on a surface of the base substrate in the non-display region to define the display region and the non-display region, a first adhesive layer formed along a surface of the light-shielding pattern and the surface of the base substrate, a polarizing layer on the first adhesive layer, and a touch sensor layer on the polarizing layer. A viscoelasticity ratio of the light-shielding pattern relative to the first adhesive layer is 75,000 or less, and a thickness ratio of the light-shielding pattern relative to the first adhesive layer is 0.6 or less.