Organic EL Display Segmented Insulating Layer for Slim Bezel
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Solution Overview
Problem
Organic electroluminescence (EL) displays face challenges with low stability and short lifespan due to moisture absorption, leading to reduced light emission intensity and destabilization of the organic layer, particularly when a wide bezel is required to prevent water entry through the organic insulating layer.
Innovation Solution
An organic EL display configuration featuring a first separation groove in the insulating layer between the display and peripheral regions, with a covering section where the end face of the second insulating layer is covered by the organic layer or second electrode, and a sealing section formed by laminating the conductive layer and second electrode, effectively preventing water entry and enhancing reliability while allowing for a slim bezel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wide bezel is provided to prevent water entry through the organic insulating layer, then reliability is improved, but device size increases
Solution Approach 1:
The patent divides the organic insulating layer into multiple regions separated by grooves. The organic insulating layer is segmented into a first region covering the pixel electrode and a second region covering the common electrode, with a groove separating them. This segmentation prevents water in the peripheral region from reaching the display region through the organic insulating layer, improving reliability without requiring a wide bezel.
Solution Approach 2:
The patent introduces a groove as an intermediary barrier between the peripheral region and the display region. This groove acts as a mediator that blocks the migration path of water molecules through the organic insulating layer, preventing harmful substances from reaching the organic EL device while maintaining a compact device structure.
2Ease of manufacture
If the organic insulating layer is made continuous to simplify manufacturing, then ease of manufacture is improved, but water permeability increases reducing reliability
Solution Approach 1:
The organic insulating layer is segmented into distinct regions (first region and second region) separated by a groove. This segmentation is integrated into the manufacturing process through a single coating step that forms both regions and the groove simultaneously, maintaining ease of manufacture while preventing water permeation paths.
Solution Approach 2:
The groove structure is formed preliminarily during the organic insulating layer formation process itself, before subsequent manufacturing steps. The coating liquid is applied in a pattern that automatically creates the groove between regions, preventing water migration paths from being established in the final product.
3Reliability
If a separation groove is formed in the organic insulating layer to prevent water migration, then reliability is improved, but manufacturing complexity increases
Solution Approach 1:
The separation groove is formed preliminarily during the organic insulating layer formation process. The coating liquid is applied in a specific pattern that automatically creates the groove structure between the first and second regions, eliminating the need for separate groove formation steps and reducing manufacturing complexity.
Solution Approach 2:
The patent changes the parameters of the coating process (such as coating liquid composition, coating method, or drying conditions) to enable automatic groove formation. By adjusting these parameters, the organic insulating layer forms with an integrated groove structure that prevents water migration without requiring additional manufacturing steps.
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
This configuration improves the reliability of the organic EL device by preventing water entry and reducing the distance between the display and peripheral regions, thereby achieving a slim bezel and extending the lifespan of the organic EL display.
Implementation Method 1
An organic EL device that emits light by utilizing an EL phenomenon of an organic material
Data Source
AI summary
An organic EL display includes: a first insulating layer on a lower side as well as a second insulating layer on an upper side, the first insulating layer and the second insulating layer being provided to a display region and a peripheral region; a first separation groove provided in the first insulating layer between the display region and the peripheral region; a first conductive layer provided on the first insulating layer in the peripheral region, with a side face and a bottom of the first separation groove in between; a covering section in which at least a part of an end face of the second insulating layer is covered by the organic layer or the second electrode; and a sealing section provided on an outer edge side of the covering section, and formed by laminating the first conductive layer and the second electrode.