Sub-Pixel Bank Surface Structure for Lateral Leakage Suppression
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Solution Overview
Problem
Existing display devices experience lateral leakage currents between adjacent sub-pixels, which can be exacerbated by external light incident on the lower portion of banks.
Innovation Solution
The display device incorporates a bank with a black-based material to absorb external light and forms a surface unevenness on the bank surface, along with a trench, to minimize lateral leakage currents between adjacent sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an organic layer is formed integrally across all sub-pixels, then manufacturing process is simplified, but lateral leakage current increases between adjacent sub-pixels
Solution Approach 1:
The bank structure is designed with different properties at different locations: the upper surface has surface unevenness (protrusions and recesses) to increase lateral resistance and prevent leakage current, while the lower surface remains relatively flat to facilitate integral formation of the organic layer. This local differentiation allows the bank to simultaneously prevent lateral leakage and maintain manufacturing simplicity.
2Object-affected harmful factors
If a bank with black-based material is used to absorb external light, then external light interference is reduced, but manufacturing complexity increases
Solution Approach 1:
The bank structure combines multiple functions into a single component: it provides lateral resistance to prevent leakage current, absorbs external light through black-based material, and facilitates integral organic layer formation. By merging these functions into one structure rather than using separate components, the patent reduces overall device complexity while achieving multiple objectives.
3Reliability
If surface unevenness is formed on the bank during coating and cleaning process, then lateral leakage current is minimized, but process complexity increases
Solution Approach 1:
The surface unevenness on the bank is formed as a byproduct of the standard coating and cleaning process rather than requiring a separate processing step. The protrusions and recesses on the bank surface are created during the photoresist coating and development process, allowing the bank structure to self-generate the features needed to prevent lateral leakage current without adding extra manufacturing complexity.
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 reduces lateral leakage currents by integrating an organic layer across all sub-pixels and forming surface unevenness on the bank, enhancing process complexity and improving display performance.
Implementation Method 1
a bank disposed on the anode electrode of the display area, located at a boundary between adjacent sub-pixels, and overlapping a periphery of an upper surface of the anode electrode
Data Source
AI summary
Discussed is a display device including a substrate having a display area including a plurality of sub-pixels including, and a non-display area around the display area, an anode electrode disposed in each of the plurality of sub-pixels on the substrate in the display area, a bank disposed on the anode electrode in the display area, located at a boundary between adjacent sub-pixels, and overlapping a periphery of an upper surface of the anode electrode, an organic layer disposed on the anode electrode and the bank in the display area and disposed across the plurality of sub-pixels, and a dam on the substrate in the non-display area, in which the dam includes a same material as the bank, and a surface unevenness is formed on an upper surface of the bank in the display area.