Sub-Pixel Boundary Insulation for Leakage-Resistant Displays
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Solution Overview
Problem
Existing display devices face challenges in maintaining reliability due to current leakage and lateral leakage through conductive intermediate layers in the boundary areas between adjacent sub-pixels, which affect the performance and longevity of the display.
Innovation Solution
Incorporating an insulating dummy pattern, such as an organic insulation pattern made of parylene, between conductive intermediate layers in the boundary areas of adjacent sub-pixels to block current transmission and reduce lateral leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive intermediate layer is used to connect emission components between sub-pixels, then electrical connectivity is improved, but current leakage and lateral leakage occur in boundary areas
Solution Approach 1:
The patent applies local quality by making the intermediate layer have different properties in different regions: conductive in emission areas for electrical connectivity, and insulating (dummy pattern) in boundary areas to prevent current leakage and lateral leakage. This spatial variation in material properties resolves the contradiction between needing conductivity and preventing harmful leakage.
Solution Approach 2:
The dummy pattern acts as an intermediary insulating layer introduced between the conductive intermediate layer and the emission components in boundary areas. This intermediary structure blocks the harmful lateral leakage current while allowing the conductive intermediate layer to maintain its connectivity function in emission areas.
2Reliability
If the pixel-defining layer is recessed to form a trench in boundary areas, then current leakage is reduced, but manufacturing complexity increases
Solution Approach 1:
The pixel-defining layer is segmented by recessing it in boundary areas to form trenches, physically separating the emission areas from boundary areas. This segmentation prevents current leakage by creating a structural barrier, though it does increase manufacturing complexity.
3Reliability
If an insulating dummy pattern is added in boundary areas, then reliability is improved by blocking current leakage, but device complexity increases
Solution Approach 1:
The dummy pattern applies local quality by adding insulating material only in boundary areas where current leakage occurs, rather than uniformly across the entire device. This targeted approach improves reliability while minimizing the increase in overall device complexity.
Solution Approach 2:
The dummy pattern serves as an intermediary insulating layer that mediates between the conductive intermediate layer and emission components in boundary areas, blocking harmful current leakage while maintaining the overall structural organization.
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
The implementation of an insulating dummy pattern enhances the reliability of the display device by preventing current leakage and improving the overall performance and longevity of the display.
Implementation Method 1
A dummy pattern is arranged between the first intermediate layer and the second electrode in the boundary area. The dummy pattern is an insulation pattern including an organic material.
Data Source
AI summary
A display device includes a substrate defining a first sub-pixel and a second sub-pixel which are adjacent to each other. Each of the first sub-pixel and the second sub-pixel includes a first electrode. The display device further includes a pixel-defining layer on the first electrodes; a first emission component to emit light and on the first electrodes and the pixel-defining layer; a first intermediate layer on the first emission component; a second emission component to emit light and on the first intermediate layer; and a second electrode on the second emission component. At least part of the pixel-defining layer may be recessed to form a trench in a boundary area of the first sub-pixel and the second sub-pixel. A dummy pattern may be between the first intermediate layer and the second electrode in the boundary area. The dummy pattern may be an insulation pattern including an organic material.