Display Apparatus Dummy Unit for Inkjet Stain Prevention
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Solution Overview
Problem
Display apparatuses face issues with unwanted stains and yellowing in the peripheral areas due to inkjet processes, which affect the display quality and longevity.
Innovation Solution
The display apparatus includes a dummy unit with a higher concentration of scatterers in its base resin, surrounded by an external partition wall, and functional layers with specific quantum dots and scatterers, which prevents corner stains and yellowing by containing defective ink during the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inkjet process is used to form functional layers, then manufacturing flexibility and precision are improved, but unwanted stains and yellowing occur in peripheral areas
Solution Approach 1:
The patent extracts and isolates the harmful effect (defective ink) by creating a dummy unit that captures excess ink during the inkjet process. The external partition wall surrounds the dummy unit to contain the extracted harmful substance, preventing it from spreading to the display area and causing stains or yellowing.
Solution Approach 2:
The dummy unit acts as an intermediary element between the inkjet printing process and the display area. It receives and holds the defective ink that would otherwise contaminate the peripheral areas, serving as a buffer zone that protects the display quality while allowing the inkjet process to proceed.
2Object-generated harmful factors
If dummy unit with high scatterer concentration is added, then corner stains and yellowing are prevented, but device structure becomes more complex
Solution Approach 1:
The patent merges the dummy unit with the existing peripheral area structure of the display device. The external partition wall is integrated into the overall device architecture, combining the stain-prevention function with the existing structural elements rather than adding completely separate components.
Solution Approach 2:
The dummy unit is placed only in specific peripheral areas where stains and yellowing are most likely to occur, rather than uniformly across the entire device. The high scatterer concentration is localized to the dummy unit region, providing targeted protection without unnecessarily complicating the entire device structure.
3Object-generated harmful factors
If external partition wall is used to contain dummy unit, then defective ink is confined effectively, but manufacturing process becomes more difficult
Solution Approach 1:
The external partition wall and dummy unit are formed in advance during the manufacturing process, before the inkjet deposition of functional layers. This preliminary preparation ensures that the containment structure is already in place to capture any defective ink, simplifying the overall manufacturing flow rather than requiring additional corrective steps later.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively minimizes corner stains and yellowing in the display area by collecting and confining defective ink, ensuring a cleaner and more stable display performance.
Implementation Method 1
a first functional layer disposed between the plurality of banks and including a first base resin, a first quantum dot, and a first scatterer
Data Source
AI summary
A display apparatus includes a substrate, a first display element, a first bank, a first functional layer, and a dummy unit. The first display element overlaps a face of the substrate. The first functional layer overlaps the first display element, is confined by at least the first bank, and includes a first base resin, first quantum dots, and first scatterers. The dummy unit overlaps no display elements of the display apparatus in a direction perpendicular to the face of the substrate and includes a first wall, a dummy-unit base resin, and dummy-unit scatterers. The dummy-unit base resin and the dummy-unit scatterers are confined by at least the first wall. A concentration of the dummy-unit scatterers in the dummy-unit base resin is greater than a concentration of the first scatterers in the first base resin.