Touch Display Boundary Support for Polarizer Flatness
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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
1Object-affected harmful factors
If the polarizing plate is disposed on the entire surface of the substrate including the non-display area, 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 applies local quality by making the support structure height position-dependent: in the first non-display area closer to the display area, the support structure has a first height, while in the second non-display area farther from the display area, the support structure has a second height that is different from the first height. This localized variation in support structure height provides differential support to the polarizing plate, maintaining its flatness near the display boundary while allowing appropriate positioning in farther regions, thus preventing bending-induced display defects while preserving reflection prevention benefits.
2Stability of the object's composition
If the planarization layer is extended into the non-display area to support the polarizing plate, then polarizing plate stability is improved, but the planarization layer may overflow causing manufacturing defects
Solution Approach 1:
The patent introduces a support structure as an intermediary element between the planarization layer and the polarizing plate. The support structure is positioned in the non-display area and provides mechanical support to the polarizing plate without requiring the planarization layer to extend into the non-display area. This intermediary support mechanism enables polarizing plate stability while preventing planarization layer overflow and maintaining precise boundary control between display and non-display areas.
Solution Approach 2:
The patent segments the support function from the planarization layer by introducing a separate support structure. The planarization layer is confined to the display area for precise manufacturing control, while the support structure in the non-display area independently provides the necessary support to the polarizing plate. This segmentation allows each component to perform its specific function without interfering with the other, preventing planarization layer overflow while maintaining polarizing plate stability.
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.