Zero-Bezel Light-Emitting Display Dam Structure for Moisture Isolation
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Solution Overview
Problem
Light emitting display apparatuses suffer from reduced reliability due to penetration of external materials like water and moisture, and multi-screen displays experience image discontinuity due to bezel areas, leading to a reduced sense of immersion.
Innovation Solution
The design incorporates a zero bezel structure with a dam and device isolation portion to prevent lateral penetration of moisture, and a groove line to isolate layers, ensuring a seamless display across multiple screens.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel area is provided to protect the light emitting device, then reliability is improved, but bezel width increases causing image discontinuity in multi-screen displays
Solution Approach 1:
The isolation function is segmented into multiple components: a dam structure that extends from the edge toward the display area, and a separate isolation portion that connects to the dam. This segmentation allows the protective function to be distributed across different structural elements rather than requiring a single wide bezel.
Solution Approach 2:
The protection mechanism transitions from a two-dimensional bezel area on the front surface to a three-dimensional dam structure that extends vertically and laterally. The dam has a first height extending from the substrate and a second height for the isolation portion, creating a multi-level barrier that provides protection without increasing the front-facing bezel width.
2Length of stationary object
If bezel width is reduced to achieve zero bezel, then image continuity is improved, but reliability deteriorates due to moisture penetration
Solution Approach 1:
The protective function is divided between the dam structure and the isolation portion, allowing each component to be optimized for its specific role while collectively providing comprehensive protection without requiring a wide bezel.
Solution Approach 2:
The isolation portion acts as a thin film or barrier layer that extends from the dam toward the display area, providing a continuous protective layer that prevents moisture penetration while occupying minimal space.
3Reliability
If a dam structure is added to prevent moisture, then reliability is improved, but device complexity increases
Solution Approach 1:
The dam structure and isolation portion are merged into a single integrated formation process, where both structures are created together during the same manufacturing stage. This merging reduces the number of separate manufacturing steps and simplifies the overall device fabrication process.
Solution Approach 2:
The dam structure serves multiple functions: it provides the primary barrier against moisture, supports the isolation portion, and defines the boundary between the display area and the edge region. This multi-functionality reduces the need for additional separate protective components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enhances display reliability by preventing moisture ingress and maintains image continuity, providing a seamless viewing experience in multi-screen configurations.
Implementation Method 1
a light emitting device layer including a self-emitting device disposed over the planarization layer
Data Source
Figure 1~2A
Figure 2B~2C
Figure 3
AI summary
A light emitting display apparatus (10) includes a substrate (100) including a display area (AA), a circuit layer (101) disposed in the display area (AA), a planarization layer (103) disposed over the circuit layer (101), a dam (104) disposed over the circuit layer (101) along a periphery portion of the substrate (100), a device isolation portion (102) disposed in the circuit layer (101) and including a device isolation line (102a) surrounding the dam (104), and a light emitting device layer (EDL) including a self-emitting device (ED) disposed over the planarization layer (103), the dam (104), and the device isolation portion (102), the device isolation line (102a) may comprise a protrusion tip (102t) protruding from the circuit layer (101) to the dam (104), and the self-emitting device (ED) may be isolated by the protrusion tip (102t) of the device isolation line (102a) at the device isolation portion (102).