Pixel Electrode Gap Layout to Prevent Display Short Circuits
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Solution Overview
Problem
Existing display devices face challenges in preventing short circuit defects between electrodes, which affect the reliability and efficiency of light-emitting elements.
Innovation Solution
A pixel design featuring electrodes with varying widths and chamfered regions, along with insulating layers, is implemented to create distinct gaps and contact regions, preventing short circuits and enhancing the structural integrity of light-emitting elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If electrodes are placed close to each other to reduce pixel area, then area efficiency is improved, but short circuit defects occur between electrodes
Solution Approach 1:
The end portions of the first and second electrodes are formed with curved surfaces instead of sharp edges. This curvature design prevents direct contact between adjacent electrodes while maintaining minimal spacing, thus avoiding short circuits and improving reliability without sacrificing area efficiency.
Solution Approach 2:
The electrodes are designed with asymmetric end portions where the curvature radius and shape differ from the main body of the electrode. This asymmetric design allows the electrodes to follow each other's contours without making direct contact, preventing short circuits while maintaining compact pixel structure.
2Illumination intensity
If electrode width is increased to improve light emission, then light emission efficiency is improved, but risk of short circuit between electrodes increases
Solution Approach 1:
By curving the end portions of wide electrodes, the patent maintains large electrode width for efficient light emission while preventing direct contact with adjacent electrodes. The curved surfaces allow wider spacing between electrode edges, reducing short circuit risk even when electrodes are wide.
Solution Approach 2:
The electrode structure has different properties in different regions: the main body has large width for light emission, while the end portions have curved shapes with reduced effective width for short circuit prevention. This local quality differentiation resolves the contradiction between width and reliability.
3Reliability
If chamfered regions are added to electrodes to prevent short circuits, then short circuit prevention is improved, but manufacturing complexity increases
Solution Approach 1:
Instead of adding separate chamfered regions, the patent integrates the protective function directly into the electrode end portions through curvature. This single integrated design achieves short circuit prevention without increasing structural complexity or manufacturing steps.
Data Source
AI summary
A pixel includes a first electrode and a second electrode facing each other, an insulating layer on the first and second electrodes, a plurality of light-emitting elements located on the insulating layer between the first electrode and the second electrode, a first contact electrode electrically connected to the first electrode, and a second contact electrode electrically connected to the second electrode. Here, a first gap having a constant width in a first direction and a second gap having a width in the first direction that gradually changes along a second direction are located between the first electrode and the second electrode or between the first contact electrode and the second contact electrode.