Sub-Pixel Pad Insulation Structure to Prevent Display Shorts
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Solution Overview
Problem
The likelihood of short-circuit defects between first and second pad electrodes connected to light-emitting elements in display devices is high, leading to potential defects and reduced yield in display devices.
Innovation Solution
Incorporating an insulating layer with an organic layer between the first and second pad electrodes, covered by an inorganic layer, along with a planarization and passivation layer, to ensure electrical insulation and prevent short-circuiting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If pad electrodes are placed close to each other in the sub-pixel area, then device area is reduced, but short-circuit defect likelihood increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the first and second pad electrodes. This insulating layer includes an organic layer and an inorganic layer, which physically separates the two pad electrodes and prevents direct electrical contact, thereby eliminating the short-circuit defect while allowing the electrodes to remain in close proximity within the sub-pixel area.
2Reliability
If insulating layer is added between pad electrodes, then short-circuit defect is prevented, but device complexity increases
Solution Approach 1:
The insulating layer is constructed as a composite structure combining an organic layer and an inorganic layer. The organic layer provides base insulation and coverage, while the inorganic layer provides additional insulation and protection. This composite approach enhances reliability by combining the advantages of both material types while maintaining a relatively simple fabrication process using standard deposition techniques.
Data Source
AI summary
An electronic device according to one or more embodiments includes a display device including a substrate including a sub-pixel area, a first pad electrode and a second pad electrode above a first surface of the substrate, and spaced apart from each other in the sub-pixel area, an insulating layer between the first pad electrode and the second pad electrode, covering an end of the first pad electrode facing the second pad electrode, covering an end of the second pad electrode facing the first pad electrode, and including an organic layer, and an inorganic layer above the organic layer, and a light-emitting element above the first pad electrode, the second pad electrode, and the insulating layer, and electrically connected between the first pad electrode and the second pad electrode.