OLED Display Insulating Layer Reverse Tapered Groove Crosstalk
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Solution Overview
Problem
Existing OLED and QLED display devices face challenges with crosstalk due to electrical interference between subpixels, which affects color mixing and efficiency, and previous methods to suppress crosstalk, such as forming electrodes on side surfaces, complicate manufacturing.
Innovation Solution
A display device design featuring lower electrodes separated by an insulating layer with a reverse tapered groove or hole, where the electroluminescence layer includes a target layer with thinner regions between electrodes and a partition, enhancing insulation and reducing crosstalk without the complexity of forming layers on tapered surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are formed on side surfaces of partitions to suppress crosstalk, then crosstalk suppression is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of forming electrodes on the side surfaces of partitions (conventional approach), the patent inverts the approach by forming the partition structure first and then forming the electroluminescence layer to bridge between partitions. This reversal simplifies manufacturing by eliminating the need to form electrodes on difficult-to-access side surfaces.
Solution Approach 2:
The patent transitions from a two-dimensional electrode arrangement to a three-dimensional structure where the electroluminescence layer extends vertically between partitions and horizontally between electrodes, creating multiple pathways for current flow that reduce crosstalk without requiring side-surface electrodes.
2Reliability
If the insulating layer thickness is increased to reduce crosstalk, then crosstalk suppression is improved, but device area increases
Solution Approach 1:
The insulating layer is configured with varying thickness: thicker regions between adjacent lower electrodes provide crosstalk suppression, while thinner regions above partitions allow for compact device area. This local variation in thickness optimizes both crosstalk suppression and space utilization.
3Ease of manufacture
If the electroluminescence layer is made continuous across partitions, then manufacturing is simplified, but crosstalk increases
Solution Approach 1:
The electroluminescence layer exhibits local quality variations: it is continuous in regions where manufacturing simplicity is needed, but forms discontinuous or thinner sections above partitions where crosstalk suppression is critical, achieving both manufacturing ease and performance.
Solution Approach 2:
The partition structure acts as an intermediary element between adjacent lower electrodes. The electroluminescence layer interacts with these partitions by forming specific patterns around them, allowing the partition to mediate between the conflicting requirements of continuity and crosstalk suppression.
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 effectively suppresses crosstalk, simplifies manufacturing, and improves display performance by increasing insulation between electrodes, leading to higher luminance and longer device lifespan.
Implementation Method 1
at least a part of an inner wall of the insulating layer defining the gap includes a reverse tapered portion
Implementation Method 2
an electroluminescence layer electrically connected to the plurality of lower electrodes, the electroluminescence layer including a plurality of layers including a light-emitting layer
Data Source
AI summary
A hole transport layer serving as a target layer includes a part of a region formed between a plurality of lower electrodes and a partition, and includes a first portion and a second portion across at least one of a non-formation portion of the target layer and a region where the target layer is thinner than the target layer on the plurality of lower electrodes in the reverse tapered portion.