Display Panel Tapered Bank Pattern to Reduce Interference Fringes
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Solution Overview
Problem
Interference fringes in display devices due to pixel structure and interconnection regularity degrade display quality.
Innovation Solution
A display panel design featuring a bank pattern with a tapered part that varies in width and slope angle within a subpixel, reducing interference fringes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a regular pixel structure and interconnection pattern are used, then manufacturing is simplified, but interference fringes appear that degrade display quality
Solution Approach 1:
The bank pattern is designed with a tapered part having a specific slope angle (30° to 60°) and width (100 nm to 500 nm) only at the boundary between emission and non-emission regions, while other regions maintain regular structures. This localized modification reduces interference fringes without complicating the overall manufacturing process
Solution Approach 2:
The bank pattern introduces asymmetric tapered structures at the emission/non-emission region boundaries, breaking the symmetry of regular pixel structures. This asymmetry disrupts the formation of interference fringes caused by regular pixel patterns while maintaining manufacturing feasibility
2Manufacturing precision
If the bank pattern has a steep tapered part, then the emission region is well-defined, but interference fringes are enhanced
Solution Approach 1:
The slope angle of the tapered part is optimized to a specific range (30° to 60°) and the width is controlled (100 nm to 500 nm). These parameter changes balance the definition of emission regions with the reduction of interference fringes, avoiding both too-steep and too-gentle slopes
3Manufacturing precision
If the bank pattern width is increased, then the emission region boundary is sharper, but interference fringes become more prominent
Solution Approach 1:
The width of the tapered part is controlled within a specific range (100 nm to 500 nm). This parameter optimization achieves sharp emission region boundaries while minimizing the prominence of interference fringes
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 minimizes interference fringes, enhancing display quality by improving luminance and contrast.
Implementation Method 1
irregularly mixing constructive and destructive interference patterns
Implementation Method 2
The bank pattern may include a tapered part having a width from an end of the electrode pattern to the opening
Data Source
AI summary
A display panel may include a bank pattern having an opening through which an electrode pattern of a light-emitting element layer is exposed. The bank pattern may include a tapered part having a width from an end of an electrode pattern to the opening. At least one of a width and a slope angle of the tapered part may be partially differently set.