Display Panel Dam Structure for Inkjet Material Confinement
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Solution Overview
Problem
Display devices with touch sensing functions face issues of organic material flow and alignment mark coverage due to inkjet processing, leading to defects and misalignment during substrate cutting.
Innovation Solution
A display device design featuring a touch electrode passivation layer with open regions and dam structures in the peripheral areas, preventing the flow of high refractive index material and ensuring proper alignment by confining it within specific regions, thereby preventing carbonized foreign material generation and improving light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch electrode passivation layer is formed continuously across the peripheral area, then the alignment marks are covered and foreign materials may occur, but the structural integrity and protection of the touch electrode are reduced
Solution Approach 1:
The touch electrode passivation layer is segmented into a first region (over the display area) and a second region (over the peripheral area), with the second region having openings that expose the touch electrode. This segmentation allows the passivation layer to provide protection where needed while maintaining alignment mark visibility and preventing foreign material accumulation in specific areas.
Solution Approach 2:
The passivation layer is designed with different properties in different regions: the first region provides continuous coverage for protection, while the second region has openings to prevent foreign material accumulation and expose alignment marks. This local differentiation resolves the contradiction between protection and alignment accuracy.
2Ease of manufacture
If the high refractive index material is allowed to flow freely during inkjet processing, then the manufacturing process is simpler, but organic material flows to surroundings causing foreign materials and misalignment
Solution Approach 1:
The touch electrode passivation layer with its specific opening pattern is formed before the inkjet processing step. This preliminary structure acts as a barrier that confines the high refractive index material within the display area during inkjet deposition, preventing organic material from flowing to the peripheral area while still allowing straightforward inkjet processing.
Solution Approach 2:
The touch electrode passivation layer serves as an intermediary structure between the inkjet processing system and the final device structure. It controls the flow and placement of high refractive index material during manufacturing, ensuring precise material placement without requiring complex processing procedures.
3Object-affected harmful factors
If the touch electrode passivation layer is removed in the peripheral area, then foreign material accumulation is prevented, but the protection and insulation of the touch electrode are reduced
Solution Approach 1:
The passivation layer is segmented spatially, maintaining continuous coverage over the display area where touch electrodes require protection, while creating controlled openings in the peripheral area where foreign material accumulation would occur. This segmentation allows simultaneous achievement of protection and foreign material prevention.
Solution Approach 2:
The passivation layer provides different levels of coverage based on local requirements: full coverage in the display area for electrode protection, and selective openings in the peripheral area to prevent foreign material accumulation. This local quality differentiation resolves the contradiction between protection and contamination prevention.
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
Prevents the flow of organic material and carbonized foreign material generation, ensuring accurate alignment and enhanced light efficiency by confining the high refractive index layer within designated regions, thus addressing the defects and misalignment issues in touch sensing display devices.
Implementation Method 1
a high refractive index layer that covers the touch electrode passivation layer and the second opening
Data Source
AI summary
A display device according to embodiments includes: a display panel that includes a display area that includes a partition layer that includes a first opening through which light is emitted from an organic light emitting diode and a peripheral area around the display area; a touch electrode disposed on the display panel; a touch electrode passivation layer that covers the touch electrode and includes a second opening that corresponds to the first opening; and a high refractive index layer that covers the touch electrode passivation layer and the second opening. The touch electrode passivation layer includes an open region formed in a portion that corresponds to the peripheral area, and the touch electrode passivation layer is not formed in the open region.