Zero-Bezel Light Emitting Display Isolation for Water Blocking
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Solution Overview
Problem
Multi-screen light emitting display apparatuses suffer from a sense of discontinuity due to boundary portions between adjacent displays, reducing viewer immersion, and are prone to reliability issues from water penetration through large bezel widths.
Innovation Solution
A light emitting display apparatus with a zero bezel width design, featuring a substrate with a display area, circuit layer, planarization layer, dam, and device isolation portion, where the device isolation line includes a protrusion tip to isolate the light emitting device, preventing water penetration and maintaining image continuity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bezel or covering mechanism 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 device isolation line is extended vertically to protrude from the circuit layer to the dam, creating a three-dimensional barrier structure. This vertical extension provides effective water blocking without requiring horizontal bezel width, thus protecting the light emitting device while maintaining a narrow or zero bezel design for continuous multi-screen displays
Solution Approach 2:
The device isolation line is divided into multiple layers: a first portion within the circuit layer and a second portion (protrusion tip) extending outward to the dam. This segmentation allows each layer to perform its specific function - the first portion provides planar isolation while the second portion provides vertical water barrier protection, achieving both compact size and reliable protection
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.