Display Apparatus Metal Pattern Leakage Current Discharge
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Solution Overview
Problem
Display apparatuses face issues with side leakage currents, leading to unintended light emission from non-driven sub-pixels, which reduces color reproduction range and display quality, especially at low gray scales.
Innovation Solution
The display apparatus incorporates a metal pattern below openings in the bank between sub-pixels, connected to the sub-pixels and a common organic layer, allowing leakage currents to be discharged through the metal pattern when a ground voltage is applied, and features irregular surface curves to increase the path length of leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a common organic layer is used across multiple sub-pixels, then manufacturing cost is reduced and device complexity is simplified, but side leakage current increases causing unintended light emission
Solution Approach 1:
A bank structure is introduced as an intermediary component between adjacent sub-pixels. The bank is formed with an opening that exposes the first electrode, and a leakage current prevention layer is disposed within the bank. This intermediary structure blocks the side leakage current path through the common organic layer while maintaining the benefits of a shared organic layer architecture.
Solution Approach 2:
The common organic layer is segmented by introducing the bank structure with its opening. The leakage current prevention layer within the bank creates distinct electrical isolation zones between adjacent sub-pixels, effectively dividing the continuous organic layer into electrically isolated segments that prevent lateral current flow.
2Weight of stationary object
If the organic layer is made thinner to reduce device thickness, then weight and thickness are reduced, but side leakage current increases
Solution Approach 1:
The bank structure with the leakage current prevention layer serves as an intermediary barrier that specifically addresses the side leakage issue. This allows the organic layer to be made thinner without compromising electrical isolation, as the bank provides the necessary blocking function that compensates for the reduced thickness.
3Illumination intensity
If openings are made larger in the bank to improve light emission, then brightness is improved, but side leakage current paths increase
Solution Approach 1:
The bank structure is designed with spatially varying properties: the opening area is optimized for light emission while the sidewalls are covered with the leakage current prevention layer. This local differentiation allows the opening to be sufficiently large for brightness while the protected sidewalls prevent side leakage current paths.
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 configuration effectively reduces side leakage currents, minimizing unintended light emission and enhancing color reproduction and display quality by preventing unwanted light from non-driven sub-pixels, particularly at low gray scales.
Implementation Method 1
allowing leakage currents to be discharged through the metal pattern when a ground voltage is applied
Data Source
AI summary
Embodiments of the present specification may provide a display apparatus including a first protective layer disposed on a substrate, a second protective layer disposed on the first protective layer and having a plurality of first openings, a plurality of first electrodes disposed on the plurality of first openings, a bank disposed on the second protective layer and having a second opening in an area between two adjacent first electrodes among the plurality of first electrodes, a pattern structure disposed below the second opening, and a common organic layer disposed in an area including the plurality of first electrodes, the bank, and the pattern structure and connected to the plurality of first electrodes and a metal pattern of the pattern structure.