Display Transmission-Area Groove Structure for Defect Control
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Solution Overview
Problem
Existing display apparatus manufacturing processes face challenges in reducing defects and simplifying the production of display apparatus with transmission areas, which are essential for incorporating additional functions while maintaining display quality.
Innovation Solution
The display apparatus incorporates a substrate with a transmission area, a display area, and a middle area, featuring a pixel circuit with thin film transistors made of polycrystalline silicon and oxide semiconductors, a display element with an emission layer, and a thin film encapsulation layer, along with a groove structure in the middle area to prevent moisture permeation and simplify manufacturing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transmission area is added to the display apparatus to provide additional functions, then the versatility and functionality of the display apparatus are improved, but the manufacturing complexity and defect rate increase
Solution Approach 1:
The display apparatus is divided into three distinct areas: transmission area, display area, and middle area. Each area has specific structural characteristics and functions. The groove structure is segmented into multiple holes and recesses at different depths, allowing independent optimization of each region for its specific function while simplifying the overall manufacturing process.
Solution Approach 2:
The middle area acts as an intermediary region between the transmission area and display area. The groove structure in the middle area serves as a mediator to prevent moisture and impurities from the transmission area from reaching the display area, while also providing a transition zone that simplifies the manufacturing process by separating the functional requirements of the two main areas.
2Reliability
If a groove structure is added to prevent moisture permeation, then the reliability and protection against impurities are improved, but the device complexity increases
Solution Approach 1:
The groove structure serves multiple functions simultaneously: it acts as a moisture barrier, provides mechanical support, defines area boundaries, and facilitates manufacturing through its integrated hole and recess pattern. This multi-functionality reduces the need for additional separate protective structures, thereby maintaining reliability while controlling complexity.
Solution Approach 2:
The groove structure contains nested features including holes within the groove and recesses at different depths. The first holes extend from the first surface while second holes extend from the second surface, creating a nested protective structure that provides enhanced moisture protection without requiring a completely separate protective layer system.
3Ease of manufacture
If the manufacturing process is simplified, then the productivity and ease of manufacture are improved, but the manufacturing precision and defect control may worsen
Solution Approach 1:
The groove structure with its integrated holes and recesses is formed as a preliminary feature before the display layer is deposited. This preliminary structuring allows subsequent manufacturing steps to proceed more simply while maintaining precision, as the groove already defines the boundaries and protective features needed for defect control.
Solution Approach 2:
The groove structure utilizes parameter variations in depth and positioning of holes and recesses to achieve both manufacturing simplicity and precision. By controlling the depth parameters of first holes versus second holes, and the positioning of recesses, the structure achieves precise moisture blocking while allowing straightforward manufacturing processes.
Data Source
AI summary
A display apparatus includes a substrate including a transmission area having a first through hole, a display area surrounding the transmission area, and a middle area disposed between the transmission area and the display area, a pixel circuit disposed on the display area, the pixel circuit including a first thin film transistor including a first semiconductor layer having polycrystalline silicon, and a second thin film transistor including a second semiconductor layer including an oxide semiconductor, a display element including a pixel electrode electrically connected to the pixel circuit, an opposite electrode disposed on the pixel electrode, and an intermediate layer disposed between the pixel electrode and the opposite electrode and including an emission layer, and a groove disposed in the middle area while surrounding the first through hole.