Polarization Layer Thickness Gradient for Window Adhesion
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Solution Overview
Problem
The existing image display apparatuses suffer from defects caused by step differences at the window layer, particularly due to adhesion issues between the decorated printed layer and the window cover, leading to unwanted gaps and reduced image quality.
Innovation Solution
The image display apparatus incorporates a polarization layer with varying thicknesses in the display and non-display areas, where the decorated printed layer contacts the polarization layer at the boundary surface, and an adhesive film structure that ensures proper attachment, eliminating gaps and enhancing adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a decorated printed layer is disposed on the window cover in the non-display area, then the window layer can have various colors and aesthetic appearance, but a step difference occurs between the display area and the non-display area causing adhesion defects and gaps
Solution Approach 1:
The polarization layer is designed with varying thickness to match the step difference created by the decorated printed layer. Specifically, the polarization layer has a first thickness in the display area and a second thickness in the non-display area, creating a gradient structure that locally adapts to the underlying surface variations. This local thickness adjustment eliminates gaps and ensures uniform adhesion across the entire window layer while preserving the aesthetic appearance of the decorated printed layer.
2Ease of manufacture
If the polarization layer has uniform thickness, then the manufacturing process is simpler, but gaps and adhesion defects occur at the boundary between display and non-display areas
Solution Approach 1:
The polarization layer's thickness parameter is changed from uniform to variable across different regions. The layer transitions from a first thickness in the display area to a second thickness in the non-display area, creating a gradient structure. This parameter change allows the polarization layer to conform to the step difference caused by the decorated printed layer, eliminating gaps and ensuring uniform adhesion while maintaining manufacturing feasibility through controlled thickness variation.
3Reliability
If the decorated printed layer is made thinner, then the step difference is reduced, but the color coverage and decorative effect are compromised
Solution Approach 1:
Instead of reducing the decorated printed layer thickness in the vertical dimension, the solution addresses the step difference by varying the polarization layer thickness in the vertical dimension. The polarization layer has a first thickness in the display area and a second thickness in the non-display area, creating a gradient structure that compensates for the step difference. This dimensionality change allows the decorated printed layer to maintain its optimal thickness for decorative effect while the polarization layer adapts to eliminate adhesion gaps.
Data Source
AI summary
An image display apparatus includes a display panel that displays an image and a window layer disposed on the display panel and including a display area transmitting the image and a non-display area surrounding the display area. The window layer includes a window cover disposed to face the display panel, a decorated printed layer disposed on a lower surface of the window cover in the non-display area, and a polarization layer disposed on the lower surface of the window cover in the display area and disposed in the non-display area to cover the decorated printed layer. An inner side surface of the decorated printed layer makes contact with a side surface of the polarization layer at a boundary surface between the display area and the non-display area.