Self-Emitting Display Barrier Structure for Zero-Bezel Sealing
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Solution Overview
Problem
Light emitting display apparatuses suffer from reduced reliability due to penetration of external materials like water or moisture, leading to degraded light emitting devices and a large bezel width, which causes a sense of discontinuity in multi-screen displays.
Innovation Solution
A light emitting display apparatus with a substrate structure that includes a first region surrounded by a second region, featuring a passivation layer, planarization layer, barrier structure, and encapsulation layer to isolate the self-emitting device and block the spread of organic encapsulation, achieving a zero bezel width and preventing material penetration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel is used to cover the bezel area, then the reliability is improved by preventing water penetration, but the bezel width increases causing a sense of discontinuity in multi-screen displays
Solution Approach 1:
The patent removes the traditional bezel structure entirely and extracts only the essential protective function, implementing it through a barrier structure integrated into the substrate edges. This eliminates the need for a separate bezel component while maintaining protection against water penetration.
Solution Approach 2:
The barrier structure is merged with the substrate edges, combining the structural support function of the substrate with the protective function against water penetration. This integration eliminates the need for separate bezel components and achieves zero bezel width while maintaining reliability.
2Length of stationary object
If the bezel width is reduced below a certain limit, then the sense of discontinuity is reduced, but the light emitting device is degraded by penetration of external materials such as water or moisture
Solution Approach 1:
The barrier structure acts as an intermediary protective layer between the external environment and the light emitting device. It is positioned at the substrate edges to intercept and block water and moisture before they can reach and degrade the light emitting device, enabling zero bezel width without compromising protection.
Solution Approach 2:
The barrier structure is implemented as a thin film or shell-like structure at the substrate edges that provides effective protection against water and moisture penetration. This thin protective layer enables the bezel width to be reduced to zero while maintaining reliable protection for the light emitting device.
3Reliability
If a barrier structure is added to prevent water penetration, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The barrier structure is merged with the substrate edges, combining the structural support function of the substrate with the protective function against water penetration. This integration eliminates the need for separate bezel components and reduces overall device complexity compared to having a traditional bezel assembly.
Data Source
AI summary
A light emitting display apparatus includes a substrate including a first region and a second region surrounded by the first region, a passivation layer disposed over the substrate, a planarization layer disposed over the passivation layer disposed in the second region of the substrate, a barrier structure disposed in the first region of the substrate, a light emitting device layer including a self-emitting device disposed over the planarization layer and the barrier structure, and an encapsulation layer including an organic encapsulation layer disposed over the light emitting device layer and at least a portion of the barrier structure, the barrier structure isolates the self-emitting device and blocks the spread of the organic encapsulation layer, at the first region of the substrate.