OLED Encapsulation Structure with Overlapping Seal and Circuit Regions
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Solution Overview
Problem
Existing organic light emitting display (OLED) devices have significant non-display regions that hinder their efficiency and compactness, as they include large areas for peripheral circuits and sealing, which reduce the effective display area.
Innovation Solution
The OLED device is designed with a specific encapsulation structure that includes a first substrate with distinct regions for display, circuitry, and sealing, where the sealing region overlaps the circuitry area, allowing for a reduced non-display region by strategically placing the seal between the substrates and using a conductive pattern to connect electrodes without overlapping with the seal, thus minimizing the area occupied by non-display components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional OLED structure with separate regions for display, circuitry, and sealing is used, then the device can be manufactured with standard processes, but the non-display region occupies a large area reducing overall efficiency
Solution Approach 1:
The patent merges the sealing function with the circuitry region by positioning the seal to overlap with the peripheral circuit area. This integration allows the seal to encapsulate both the display region and the peripheral circuits simultaneously, reducing the total non-display region area while maintaining proper encapsulation and electrical connectivity.
Solution Approach 2:
The patent utilizes the vertical dimension by stacking the seal, circuitry, and display regions in overlapping configurations. The seal is positioned to overlap with the circuitry region in the planar view, effectively using vertical layering to reduce the horizontal footprint of non-display areas.
2Area of stationary object
If the seal is positioned to overlap with the peripheral circuit region, then the non-display region is reduced, but the manufacturing complexity increases due to precise alignment requirements
Solution Approach 1:
The patent divides the substrate into distinct functional regions (display region, first non-display region for circuitry, and second non-display region for sealing) with clearly defined boundaries. This segmentation allows each region to be optimized independently while maintaining overall integration, reducing manufacturing complexity despite the overlapping configuration.
3Reliability
If the conductive pattern is placed to connect electrodes without overlapping the seal, then electrical connectivity is maintained, but the layout complexity increases
Solution Approach 1:
The patent applies different functional properties to different regions: the seal region provides encapsulation and insulation, while the circuitry region provides electrical connectivity. The conductive patterns are strategically routed to connect electrodes through regions with appropriate electrical properties, avoiding the seal area to maintain both connectivity and structural integrity.
Data Source
AI summary
An organic light emitting display apparatus includes a first substrate, a second substrate, an organic light emitting device, a thin film transistor, a wiring pattern and a seal. The first substrate includes a first region, a second region and a third region. The third region surrounds the first region. The second region is between the first region and the third region, and is partially overlapped with the third region. The second substrate faces the first substrate. The organic light emitting device is disposed on the first substrate in the first region. The thin film transistor is disposed on the first substrate in a region where the second region and the third region overlap. The wiring pattern is disposed on the first substrate in the second region. The seal is disposed in the third region, between the first substrate and the second substrate in the third region.