Stacked Display Power Lines for Short-Circuit Isolation
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Solution Overview
Problem
Display devices face challenges in reducing the risk of short circuits between electrodes, particularly due to the close proximity and potential connection of power lines during manufacturing, which can lead to defects.
Innovation Solution
The display device incorporates a layered structure with insulating layers between power lines, including a first power line and a second power line that extend in different directions, and a transistor with a bridge electrode to electrically separate and overlap these lines, reducing the risk of short circuits by using a light-blocking material for the power line to prevent light-induced damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If power lines are placed close to each other to reduce device area, then area is reduced, but the risk of short circuits between electrodes increases
Solution Approach 1:
The patent transitions from planar arrangement of power lines to a three-dimensional stacked configuration. First and second power lines are positioned in different layers (first layer and second layer) and overlap in plan view, utilizing the vertical dimension to reduce lateral spacing while maintaining electrical isolation through insulating layers between the stacked conductors.
Solution Approach 2:
Insulating layers are introduced as intermediary structures between the first power line and second power line. These insulating layers physically separate the conductors and prevent direct contact, thereby eliminating the short circuit risk while allowing the power lines to be positioned in close proximity for area reduction.
2Reliability
If insulating layers are added between power lines to prevent short circuits, then reliability is improved, but device complexity increases
Solution Approach 1:
The insulating layers serve multiple functions simultaneously: they provide electrical isolation between power lines to prevent short circuits, act as structural support for the stacked configuration, and enable the vertical integration of multiple conductors. This multi-functionality reduces the need for additional dedicated components.
Solution Approach 2:
The patent employs a nested layering structure where insulating layers are positioned between conductive layers, creating a compact stacked arrangement. The first power line, insulating layer, and second power line are nested vertically, with each layer containing and supporting the others, thereby integrating multiple functions within a compact structure.
3Reliability
If power lines extend in multiple directions to reduce voltage drops, then electrical performance is improved, but manufacturing precision requirements increase
Solution Approach 1:
The power lines are divided into multiple segments that extend in different directions (first direction and second direction) within the same layer. This segmentation allows the power distribution network to reach multiple areas efficiently while maintaining precise alignment within each segment, reducing the cumulative alignment tolerance requirements compared to a single continuous line.
Solution Approach 2:
By stacking power lines in different layers that overlap in plan view, the patent creates multiple parallel current paths through the vertical dimension. This reduces voltage drops by providing redundant conduction paths while the overlapping configuration simplifies alignment requirements compared to extending single lines across the entire device area.
Data Source
AI summary
A display device includes a base layer on a plane defined by a first direction and a second direction different from the first direction, a front surface backplane layer on the base layer, and a light emitting element on the front surface backplane layer. The front surface backplane layer includes a first layer, a second layer on the first layer, and a third layer on the second layer. The first layer includes a first power line, a portion of the first power line extends in the first direction and another portion of the first power line extends in the second direction. The second layer includes a pixel circuit configured to drive the light emitting element. The third layer includes a second power line, a portion of the second power line extends in the first direction and another portion of the second power line extends in the second direction.