Touch Display Dam Structure for Edge Polarizer Support
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Solution Overview
Problem
The issue of display defects arising from insufficient support of the polarizing plate near the boundary between the display and non-display areas in touch display devices, leading to bending and reduced display quality.
Innovation Solution
A touch display device design that includes a substrate with a subpixel, encapsulation layer, touch sensor, planarization layer, and dam structures to prevent overflow of the planarization layer, enhancing display quality at the boundary between the display and non-display areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the polarizing plate is disposed on the entire surface of the substrate, then display quality is improved by preventing reflection, but the polarizing plate may bend near the boundary between display and non-display areas causing display defects
Solution Approach 1:
The patent introduces a support structure as an intermediary element between the polarizing plate and the substrate. This support structure provides additional mechanical support to the polarizing plate in the non-display area, preventing it from bending while maintaining its reflective prevention function across the entire display surface.
Solution Approach 2:
The patent extends the support function from the substrate plane to a three-dimensional structure by adding support protrusions or support films that rise from the substrate surface. This dimensional change allows the polarizing plate to be supported in the vertical dimension, preventing bending without interfering with its horizontal coverage for reflection prevention.
2Ease of manufacture
If the planarization layer is extended into the non-display area, then manufacturing simplicity is improved, but the planarization layer may overflow causing display defects
Solution Approach 1:
The patent divides the planarization layer into two distinct parts: a first planarization layer in the display area and a second planarization layer in the non-display area. This segmentation allows each layer to be independently controlled and formed with appropriate thickness, preventing overflow while maintaining manufacturing efficiency through a unified process flow.
Solution Approach 2:
The patent applies different thickness specifications to different regions of the planarization layer. The first planarization layer in the display area has one thickness requirement for optimal display performance, while the second planarization layer in the non-display area has a different thickness requirement to prevent overflow and maintain structural integrity at the boundary.
Data Source
AI summary
A touch display device with enhanced display quality at the boundary between the display area and the non-display area includes a substrate, a subpixel including a transistor positioned on the substrate and a light emitting element electrically connected with the transistor, an encapsulation layer positioned to cover the light emitting element, a touch sensor positioned on the encapsulation layer, a planarization layer positioned on the touch sensor, and at least one dam structure configured to prevent overflow of the planarization layer.