Inclined-Substrate Display Structure for Rollable Impact Strength
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Solution Overview
Problem
Existing display devices lack sufficient impact strength, particularly in rollable display devices where structural integrity is compromised during the rolling and unfolding process.
Innovation Solution
A manufacturing method involving the formation of a trench on a substrate, followed by the creation of a pixel circuit layer and a light emitting element, with an encapsulation layer and light conversion pattern, and a color filter, all with inclined surfaces, to enhance structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the substrate is etched to reduce thickness, then the display device can be made thinner and more flexible, but the impact strength of the substrate deteriorates
Solution Approach 1:
The substrate is segmented into multiple regions with different thicknesses through trench formation. The trench divides the substrate into a first region (thinner) and second region (thicker), allowing the substrate to maintain flexibility where needed while preserving impact strength in critical areas. This segmentation resolves the contradiction by creating localized thickness variations rather than uniform thinning.
Solution Approach 2:
The trench is formed in the substrate before the etching process to define the final thickness profile. This preliminary action guides the subsequent etching to reduce thickness only in specific regions while maintaining thicker portions for structural support. The preliminary trench formation ensures that the etching process achieves the desired thinness without compromising overall impact strength.
2Length of moving object
If the etching process is extended to reduce substrate thickness, then the display device achieves greater flexibility, but the manufacturing time increases
Solution Approach 1:
The etching process is segmented into two distinct stages: first, forming the trench structure to define the thickness profile, and second, performing the actual etching to reduce thickness only in the first region. This segmentation allows the process to achieve the desired thinness more efficiently by avoiding unnecessary etching in the second region, thereby reducing overall manufacturing time.
Solution Approach 2:
The trench is formed as a preliminary action before the etching process begins. This preliminary structure guides the etching process to target only the necessary regions, preventing excessive or prolonged etching. The preliminary trench definition ensures that the etching process is both time-efficient and achieves the desired thickness reduction.
3Adaptability or versatility
If the substrate is made thinner for flexibility, then the display device can be rolled more easily, but the structural integrity during rolling deteriorates
Solution Approach 1:
The substrate is segmented into a first region with reduced thickness for flexibility and a second region with greater thickness for structural integrity. This segmentation allows the display device to achieve both flexibility (in the first region for rolling) and structural integrity (in the second region during rolling operations), resolving the contradiction between adaptability and stability.
Solution Approach 2:
Different regions of the substrate are given different thickness characteristics tailored to their specific functional requirements. The first region has localized thinness for flexibility and rolling, while the second region maintains greater thickness for structural support during rolling. This local quality differentiation resolves the contradiction by optimizing each region independently rather than uniformly thinning the entire substrate.
Data Source
AI summary
A display device includes a substrate including a first surface, a second surface, and a side surface between the first surface and the second surface, a pixel circuit layer on the first surface and the side surface of the substrate and including a transistor, and a light emitting element on the pixel circuit layer and electrically connected to the transistor, wherein the side surface of the substrate has an inclination.