Organic Light Emitting Display Signal Line Insulation Structure
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Solution Overview
Problem
Organic light emitting display devices face short-circuit defects due to foreign matter between signal lines, leading to high parasitic capacitance and reduced distance between signal lines, which causes electrical shorts.
Innovation Solution
The first signal line, including a scan line and sensing control line, is formed in a horizontal direction on the substrate, while the second signal line, comprising a data line, high-voltage supply line, and low-voltage supply line, is disposed in a vertical direction on at least two insulation films, increasing the distance between the lines and preventing short-circuits by avoiding foreign matter under the first signal line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the first and second signal lines are formed with a single layer of upper insulation film between them, then the manufacturing process is simpler, but the distance between the signal lines is reduced causing short-circuit defects
Solution Approach 1:
The patent divides the insulation structure into multiple segments: a lower insulation film, an upper insulation film, and an additional intermediate insulation film. This segmentation allows each layer to perform its insulation function independently, ensuring sufficient distance and electrical isolation between the first and second signal lines while maintaining manufacturability through standard multi-layer deposition processes
Solution Approach 2:
The patent adds an intermediate insulation film layer in the vertical dimension between the lower and upper insulation films. This dimensional addition creates multiple insulation barriers stacked vertically, effectively increasing the electrical distance between signal lines without significantly increasing horizontal space requirements, thus preventing short-circuits while preserving layout compactness
2Productivity
If foreign matter is created during the manufacturing process between signal lines, then manufacturing is unaffected, but the distance between signal lines is reduced causing short-circuits
Solution Approach 1:
The patent applies beforehand cushioning by depositing the intermediate insulation film between the lower and upper insulation films during the manufacturing process. This pre-established insulation layer acts as a cushion or barrier that compensates for potential foreign matter contamination, ensuring that even if particles are present, the signal lines remain electrically isolated and short-circuits are prevented
Solution Approach 2:
The intermediate insulation film serves as an intermediary layer that mediates between the lower and upper insulation films. This mediator layer prevents direct contact between potential foreign matter and the signal lines, maintaining electrical isolation and reliability while allowing the manufacturing process to continue without special contamination control procedures
3Device complexity
If the first signal line is formed on the substrate directly, then the manufacturing process is simpler, but foreign matter can be trapped under the line causing short-circuits
Solution Approach 1:
The patent extracts the first signal line from direct contact with the substrate by introducing a lower insulation film between them. This extraction removes the problematic interface where foreign matter could be trapped, eliminating the source of potential short-circuits while maintaining relatively simple device structure through a single additional insulation layer
Data Source
AI summary
An organic light emitting display device is disclosed. The organic light emitting display device includes a light emitting element disposed in each sub-pixel area on a substrate; a pixel circuit disposed in a circuit area of each sub-pixel area to drive the light emitting element; a first signal line disposed on the substrate to contact the substrate, arranged in a first direction, and connected to the pixel circuit; a second signal line arranged in a second direction and connected to the pixel circuit; and at least two insulation films disposed between the first and second signal lines.