Display Separator Segmentation for Leakage Control
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Solution Overview
Problem
The narrow width of the bank in fine pixel structures leads to lateral leakage current between adjacent pixels, deteriorating the picture quality of display devices.
Innovation Solution
A display device with a separator having a wide width portion and a narrow width portion, featuring different gradients and tip configurations, is designed to separate the light emitting layer and charge generation layer for each pixel while maintaining a common electrode, thereby reducing lateral leakage current and voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the bank width is reduced to achieve fine pixel structure, then the pixel density is improved, but lateral leakage current between adjacent pixels increases
Solution Approach 1:
The separator is divided into multiple sections with different widths: a first section with a first width and a second section with a second width. This segmentation allows the separator to provide adequate isolation width in certain regions while maintaining fine pixel structure in other regions, thereby reducing lateral leakage current without sacrificing pixel density.
Solution Approach 2:
Different sections of the separator are assigned different widths based on local requirements. The first section has a first width optimized for isolating light emitting layers in specific pixel regions, while the second section has a second width optimized for other regions. This local differentiation allows the separator to address lateral leakage issues where needed while maintaining overall pixel structure integrity.
2Reliability
If the separator width is increased to reduce lateral leakage current, then the isolation between pixels is improved, but voltage drop increases
Solution Approach 1:
The separator is segmented into multiple sections with different widths. The first section provides enhanced isolation width to reduce lateral leakage current, while the second section maintains a narrower width to minimize voltage drop. This segmentation allows the system to balance isolation requirements with voltage maintenance.
Solution Approach 2:
The separator's width is locally optimized for different functional requirements. In regions where lateral leakage prevention is critical, the separator has greater width. In regions where voltage maintenance is prioritized, the separator has reduced width. This local quality differentiation resolves the contradiction between isolation and voltage drop.
Data Source
AI summary
A display device includes: a pixel electrode; a bank on the pixel electrode; and a separator on the bank. The separator has a wide width portion having a first tip and a second tip at both sides and a narrow width portion having a third tip on one side.