OLED Display Pad Structure for Uniform Power Distribution
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Solution Overview
Problem
Organic light emitting diode (OLED) displays face challenges in manufacturing complexity, increased dead spaces, and luminance non-uniformity, especially as the display area grows, due to the need for multiple pad regions and components like chip-on film, flexible printed circuits, and printed circuit boards.
Innovation Solution
The solution involves a base substrate with a display area and a non-display area, where the non-display area includes wire regions and a pad region at one edge, with an encapsulation substrate made of a carbon compound that includes a resin matrix and cross-aligned carbon fibers, featuring conductive layers for uniform power application to common power lines and electrodes, reducing the need for multiple pads and simplifying the structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple pad regions and components (chip-on film, flexible printed circuits, printed circuit boards) are used to drive OLED displays, then the display can function properly, but the manufacturing process becomes complex and dead spaces increase
Solution Approach 1:
The patent combines multiple separate pad regions and driving components into a single integrated pad structure. The common power line and common electrode are driven through unified pad regions that extend along the edges of the display area, eliminating the need for separate chip-on film, flexible printed circuits, and printed circuit boards. This integration directly reduces manufacturing complexity while maintaining display functionality.
Solution Approach 2:
The pad regions serve multiple functions simultaneously: they provide electrical connection points, extend as common power lines, and define the boundaries of the display area. The sealing member also serves dual purposes by both sealing the display and providing structural support. This multi-functionality reduces the number of separate components needed, simplifying the manufacturing process.
2Reliability
If multiple pad regions and components are used to drive OLED displays, then the display can function properly, but dead spaces in the substrate and product increase
Solution Approach 1:
By merging multiple pad regions into unified pad structures that extend along the edges, the patent minimizes the non-display area. The pad regions are positioned only at the periphery, allowing the display area to extend to the edges of the substrate, thereby reducing dead space while maintaining all necessary electrical connections.
Solution Approach 2:
The pad regions are extended into linear structures along the edges rather than being concentrated as large discrete components. This dimensional transformation from point/area-based pads to line-based pads maximizes the usable display area while providing sufficient electrical connection points.
3Ease of manufacture
If traditional driving structures are used in large area OLED displays, then manufacturing is simpler, but luminance uniformity deteriorates
Solution Approach 1:
The patent implements different structural characteristics in different regions: the pad regions are extended along the edges to provide uniform power distribution, while the display area maintains a clean, uninterrupted structure. The sealing member is positioned to provide both sealing and structural support where needed. This localized optimization ensures luminance uniformity across the large display area while maintaining manufacturing simplicity.
Solution Approach 2:
The extended pad regions act as common power lines that distribute electrical potential uniformly across the large display area. By positioning these pad regions along the edges and extending them as continuous conductors, the patent ensures equipotential conditions are maintained across the entire display, preventing luminance non-uniformity that would otherwise occur in large area displays.
Data Source
AI summary
An organic light emitting diode display is disclosed. The organic light emitting diode display includes a base substrate including a display area and a non-display area around the display area, a plurality of pixels formed over the display area of the base substrate, the plurality of pixels including a common electrode, a common power line formed over the base substrate and electrically connected to a circuit of each of the plurality of pixels, an encapsulation substrate bonded to the base substrate by a sealing member surrounding the plurality of pixels, the encapsulation substrate including an inner surface facing the base substrate, a first conductive layer formed over the inner surface and electrically connecting the common power line to a first potential, and a second conductive layer formed over the inner surface and spaced apart from the first conductive layer, the second conductive layer electrically connecting the common electrode to a second potential.