Stepped Bank Layer Structure for Display Electrode Continuity
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Solution Overview
Problem
Display devices face issues with electrode disconnection and reduced ink loading during fabrication, particularly in the formation of sub-pixels and bank layers, which affect the reliability and efficiency of the display panel.
Innovation Solution
The display device incorporates a specific configuration of sub-pixels with first and second electrodes, bank layers, and insulating layers, where the bank layers have varying heights and orientations to prevent electrode disconnection and enhance ink loading, including a method of forming these layers to ensure proper alignment and contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional bank layer structure is used, then the fabrication process is simple, but electrode disconnection occurs and ink loading amount is reduced
Solution Approach 1:
The bank layer is divided into multiple segments with different heights (first bank portion, second bank portion, third bank portion) arranged in a stepped configuration. This segmentation prevents electrode disconnection by providing multiple contact points while maintaining a manageable fabrication process through sequential deposition layers.
Solution Approach 2:
The bank layer transitions from a conventional two-dimensional planar structure to a three-dimensional stepped structure with varying heights. This dimensional change creates multiple exposure levels that improve electrode contact reliability while the systematic arrangement keeps the fabrication process controllable.
2Quantity of substance
If the bank layer structure is simplified, then fabrication is easier, but the ink loading amount is reduced
Solution Approach 1:
The bank layer is segmented into three distinct height levels that create expanded surface areas for ink deposition. The first bank portion (highest), second bank portion (intermediate), and third bank portion (lowest) provide progressively accessible surfaces that increase total ink loading capacity while maintaining systematic fabrication procedures.
Solution Approach 2:
The stepped bank layer structure creates nested exposure zones where each lower portion exposes additional surfaces beneath the higher portions. This nesting effect maximizes the effective surface area available for ink loading within the vertical space, increasing ink capacity without proportionally increasing fabrication complexity.
Data Source
AI summary
A display device includes a bank layer including a first bank portion and a second bank portion, the first bank portion includes a (1-1) bank portion and at least one (1-2) bank portion having an average height less than the (1-1) bank portion, the second bank portion includes a (2-1) bank portion, at least one (2-2) bank portion and having an average height less than the (2-1) bank portion, and at least one (2-3) bank portion with the (2-2) bank portion therebetween and having an average height less than the (2-2) bank portion, the (1-1) bank portion exposes an upper end of a side surface of the (1-2) bank portion, the (2-1) bank portion exposes an upper end of a side surface of the (2-2) bank portion, and the (2-2) bank portion exposes an upper end of a side surface of the (2-3) bank portion.