OLED Display Panel Via Hole Recess for Water Ingress Prevention
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Solution Overview
Problem
Conventional OLED display panels with through-hole designs for under-screen cameras are prone to water and oxygen ingress, compromising product reliability due to substrate penetration in the camera region.
Innovation Solution
An OLED display panel with a blocking wall area featuring a via hole extended through inorganic and organic layers, where the via hole's side wall has recesses that disrupt the light-emitting layer's continuity, and an encapsulation layer completely fills these recesses, preventing water and oxygen entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a through-hole structure is used for under-screen camera, then the camera can be positioned in the display area, but water and oxygen can easily enter the display area through the through hole, reducing product reliability
Solution Approach 1:
The through-hole is segmented into multiple sections: an upper hole section in the first substrate and a lower hole section in the second substrate, separated by a blocking wall. This segmentation prevents continuous water/oxygen pathways while maintaining camera functionality through the separated sections.
Solution Approach 2:
A blocking wall structure is introduced as an intermediary element between the upper and lower hole sections. This blocking wall acts as a mediator that prevents water and oxygen from passing through the entire through-hole while still allowing the under-screen camera to function.
2Ease of manufacture
If a through-hole penetrates the substrate in the camera region, then the camera structure can be formed, but the display area becomes vulnerable to water and oxygen ingress
Solution Approach 1:
The hole structure is divided into discrete segments (upper hole section and lower hole section) separated by the blocking wall, making the manufacturing process more controllable while preventing harmful substance ingress through the segmented path.
Solution Approach 2:
The blocking wall provides localized protection at the interface between the upper and lower substrates, creating a region with different properties (water/oxygen barrier) while maintaining the through-hole functionality in other regions for camera operation.
3Illumination intensity
If the light emitting layer is continuous, then the display performance is maintained, but water and oxygen can penetrate through the via hole to the display area
Solution Approach 1:
The light emitting layer is segmented to be discontinuous at the via hole location, with the layer interrupted where the via hole passes through. This segmentation prevents water and oxygen penetration while the encapsulation layer compensates to maintain overall display performance.
Solution Approach 2:
The encapsulation layer serves as an intermediary protective barrier that covers the discontinuous light emitting layer and seals the via hole region, preventing water and oxygen ingress while allowing the display to function through the encapsulated structure.
Data Source
AI summary
An organic light-emitting diode (OLED) display panel is provided. The OLED display panel comprises a substrate, inorganic layers, organic layers, a light emitting layer, an encapsulation layer, and a via hole. The via hole is extended through the inorganic layers and the organic layers. The via hole is in a blocking wall area. A side wall of the via hole includes at least one recess. The light emitting layer is discontinuous at the at least one recess. By forming the deep via hole between a through hole area and a display area and also by forming the recess in the side wall of the via hole, continuity of the organic light emitting layer to the through hole area is interrupted, so that the display area is prevented from being entered by water and oxygen.