OLED Shield Layer for Signal Line Protection
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Solution Overview
Problem
In organic light-emitting display (OLED) devices, mobile ions generated in the bending area can create electric fields that affect signal lines, leading to reliability issues such as electric corrosion defects.
Innovation Solution
A display device design featuring a substrate with a bending area, pads, signal lines, a planarization layer, and a shield layer that minimizes the impact of electric fields generated by mobile ions on signal lines by covering at least one signal line with the shield layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mobile ions are generated in the bending area layers, then the display device achieves flexibility and thinness, but electric fields are generated that affect signal lines and cause reliability issues
Solution Approach 1:
A shield layer is introduced as an intermediary component between the mobile ions in the bending area and the signal lines. This shield layer blocks or reduces the electric field generated by mobile ions, preventing interference with signal lines while maintaining device flexibility
Solution Approach 2:
The shield layer is selectively positioned only in the bending area where mobile ions are generated, rather than throughout the entire device. This localized approach protects signal lines from electric field interference while maintaining overall device flexibility and minimizing additional complexity
2Reliability
If a shield layer is added to cover signal lines in the bending area, then electric field interference is reduced, but device complexity increases
Solution Approach 1:
The shield layer is selectively positioned only in the bending area where mobile ions are generated, rather than throughout the entire device. This localized approach protects signal lines from electric field interference while maintaining overall device flexibility and minimizing additional complexity
Solution Approach 2:
The shield layer serves multiple functions: it blocks electric fields from mobile ions, provides additional mechanical protection to signal lines in the bending area, and can be integrated with existing layer structures. This multi-functionality justifies the added complexity by delivering multiple benefits from a single component
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
This design effectively suppresses electric field interference with signal lines, enhancing the reliability of OLED devices by reducing the occurrence of electric corrosion defects in bending areas.
Implementation Method 1
a shield layer disposed over the planarization layer and configured to at least cover the first signal line among the plurality of signal lines
Data Source
AI summary
The present disclosure relates to a display device, and the display device according to the embodiment of the present disclosure includes a substrate including a display area and a non-display area, the non-display area including a bending area, a first area disposed at one side of the bending area, and a second area disposed at the other side of the bending area, a plurality of pads disposed on an upper portion of the substrate in the first area and including a first pad, a circuit element configured to supply electric power at least to the first pad among the plurality of pads, a plurality of signal lines disposed on the upper portion of the substrate in the bending area and including a first signal line electrically connected to the first pad, the plurality of signal lines being electrically connected to the plurality of pads, respectively, a planarization layer configured to cover the plurality of signal lines, and a shield layer disposed over the planarization layer and configured to at least cover the first signal line among the plurality of signal lines.