Light-Emitting Display Edge Isolation for Zero-Bezel Moisture Blocking
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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, and they have a large bezel width that can cause a sense of discontinuity in multi-screen displays.
Innovation Solution
The display apparatus includes a substrate with a dam and device isolation portion featuring a protrusion tip to isolate the light emitting device, preventing water penetration and achieving a zero bezel width.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel or covering mechanism is provided to protect the light emitting device, then the reliability against water penetration is improved, but the bezel width increases causing a sense of discontinuity in multi-screen displays
Solution Approach 1:
The patent extracts the protective function from the traditional bezel structure and relocates it to the device isolation line that protrudes from the circuit layer. This isolation line forms a barrier against water penetration without requiring a visible bezel, thus eliminating the trade-off between protection and visual continuity.
Solution Approach 2:
The protective function is moved from the horizontal plane (bezel width) to the vertical dimension (protrusion height of the device isolation line). The isolation line protrudes upward from the circuit layer to block water, providing protection without increasing the horizontal bezel width.
2Length of stationary object
If the bezel width is reduced to achieve zero bezel for seamless multi-screen display, then the visual continuity is improved, but the light emitting device becomes vulnerable to water and moisture penetration
Solution Approach 1:
The protective function is extracted from the bezel and transferred to the device isolation line structure. This allows the bezel width to be reduced to zero while maintaining protection through the vertically protruding isolation line that blocks water access to the light emitting device.
Solution Approach 2:
The device isolation line acts as a thin protective barrier that extends vertically to block water penetration. This thin film-like structure provides adequate protection without requiring a thick bezel, enabling zero bezel width while maintaining reliability.
3Reliability
If a device isolation line is introduced to protect the light emitting device, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The protective function is merged with the existing device isolation line structure. Rather than adding a separate protective component, the isolation line is designed to protrude and perform both its original function and water blocking function, thus improving reliability without significantly increasing device complexity.
Data Source
AI summary
A light emitting display apparatus includes a substrate including a display area, a circuit layer disposed in the display area, a planarization layer disposed over the circuit layer, a dam disposed over the circuit layer along a periphery portion of the substrate, a device isolation portion disposed in the circuit layer and including a device isolation line surrounding the dam, and a light emitting device layer including a self-emitting device disposed over the planarization layer, the dam, and the device isolation portion, the device isolation line may comprise a protrusion tip protruding from the circuit layer to the dam, and the self-emitting device may be isolated by the protrusion tip of the device isolation line at the device isolation portion.