OLED Display Panel Spacer Structure for Moisture Barrier
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Solution Overview
Problem
In OLED display panels, the narrow bezel design increases moisture and oxygen ingress, leading to reduced device lifetime and panel yield due to the lack of effective water-blocking measures in the packaging process, especially in regions without thin-film encapsulation.
Innovation Solution
A display panel design featuring spacers with closed structures on the back and cover plates, where the first spacer's free end presses against the second spacer's free end, creating a barrier to moisture and oxygen, thereby enhancing the water-blocking effect without increasing the width of the filler glue layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a thin-film package is employed to achieve narrow bezel design, then the bezel width is reduced, but the width of the filler glue layer is reduced, allowing more moisture to enter the OLED display panel
Solution Approach 1:
The packaging structure is segmented into multiple functional layers: thin-film encapsulation layer, dam encapsulant, and filler glue layer. Each layer performs specific protection functions, allowing the bezel to be narrow while maintaining moisture resistance through the combined barrier effect of multiple layers rather than relying on a single thick filler glue layer
Solution Approach 2:
The patent employs composite packaging materials including thin-film encapsulation (organic or inorganic films), dam encapsulant (curable resin composition), and filler glue (epoxy or acrylic-based). This composite structure provides effective moisture and oxygen barrier properties while enabling narrow bezel design, as each material contributes different protective characteristics
2Length of stationary object
If the width of the filler glue layer is reduced for narrow bezel design, then the packaging area is reduced, but the amount of moisture entering through the filler glue increases
Solution Approach 1:
The thin-film encapsulation layer is formed on the back plate before the dam encapsulant and filler glue are applied. This preliminary protective layer prevents moisture from reaching the filler glue and OLED components, allowing the filler glue layer to be thinner without compromising moisture resistance
Solution Approach 2:
The thin-film encapsulation layer acts as an intermediary barrier between the external environment and the filler glue layer. It intercepts moisture and oxygen before they can reach the filler glue, enabling reduced filler glue width while maintaining protection against harmful factors
3Device complexity
If regions without thin-film encapsulation are left exposed, then manufacturing complexity is reduced, but moisture and external oxygen directly contact the filler glue and affect peripheral pixels
Solution Approach 1:
The thin-film encapsulation is selectively applied to specific regions where moisture and oxygen contact would be most harmful, such as along the periphery near the filler glue. This localized approach provides targeted protection for vulnerable areas while avoiding unnecessary complexity in regions that are already protected by the dam encapsulant and filler glue
Data Source
AI summary
A display panel is provided, the display panel including a back plate, a cover plate, a first spacer, and a second spacer, wherein the back plate has a first surface, the cover plate is disposed opposite the back plate and has a second surface opposite the first surface, the first spacer protrudes from an edge of the first surface and has a closed structure, a first connecting end, and a first free end, the first connecting end connected to the back plate, and the first free end extending away from the back plate, the second spacer protrudes from an edge of the second surface and has a closed structure, a second connecting end, and a second free end, the second connecting end connected to the cover plate, and the second free end extending away from the cover plate, and the first free end presses against the second free end.