Bank Open-Part Geometry for Stable Display Electrode Contact
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Solution Overview
Problem
Display devices face challenges with contact electrode disconnection due to the undercut of surface treatment parts during the formation of open parts in the insulating layer, leading to reduced contact areas and potential electrical failures.
Innovation Solution
A display device design featuring a thin film transistor layer with parallel electrodes, a bank pattern, and an insulating layer with a hydrophilic material, where the surface treatment part has a zigzag or wave shape to increase contact areas between the surface treatment part and contact electrodes, preventing disconnection even with undercut occurrences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating layer is formed with a flat open part, then the manufacturing process is simple, but the contact area between the surface treatment part and contact electrode is reduced leading to disconnection
Solution Approach 1:
The open part of the insulating layer is designed with a curved or zigzag shape instead of a straight line, increasing the contact area between the surface treatment part and the contact electrode. This curvature principle resolves the contradiction by maintaining manufacturing simplicity while improving connection reliability through increased contact area.
Solution Approach 2:
The contact interface is extended from a one-dimensional linear contact to a two-dimensional area contact by introducing vertical undulations in the open part shape. This dimensional change increases the contact area without significantly complicating the manufacturing process, thereby improving reliability while controlling complexity.
2Reliability
If the surface treatment part has a straight line shape, then the manufacturing process is simple, but the contact area with contact electrodes is insufficient causing disconnection
Solution Approach 1:
By curving the open part shape vertically, the design increases contact area while maintaining manufacturability. The curved shape provides tolerance for manufacturing variations and ensures adequate contact area even with normal fabrication precision, resolving the contradiction between reliability and manufacturing precision.
3Reliability
If the contact area between surface treatment part and contact electrode is increased, then disconnection is prevented, but the manufacturing complexity increases
Solution Approach 1:
The curved open part shape can be formed using standard photolithography and etching processes, maintaining ease of manufacture. The curvature is achieved through conventional manufacturing techniques without requiring additional complex steps, thus improving reliability while preserving manufacturing simplicity.
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
The design effectively prevents contact electrode disconnection by increasing contact areas, ensuring stable electrical connections and improved reliability of the display device.
Implementation Method 1
an insulating layer disposed on the bank pattern and the first and second electrodes and including an open part provided on an upper surface of the bank pattern, and a surface treatment part on the upper surface of the bank pattern exposed by the open part and having hydrophobicity
Implementation Method 2
The insulating layer and the bank pattern may include a hydrophilic insulating material, and the surface treatment part may be formed by a plasma treatment process to have the hydrophobicity
Data Source
AI summary
A display device includes a thin film transistor layer disposed on a substrate and including a transistor, a first electrode and a second electrode, each disposed on the thin film transistor layer and extending in parallel with each other, a bank pattern disposed on the first and second electrodes, an insulating layer disposed on the bank pattern and the first and second electrodes and including an open part provided on an upper surface of the bank pattern, a plurality of light emitting elements disposed between the first and second electrodes on the insulating layer, and a surface treatment part on the upper surface of the bank pattern exposed by the open part and having hydrophobicity. A shape of the open part has lines bent plural times or lines curved plural times in a plan view.