OLED Pixel Group Zigzag Arrangement for Emission Layer Uniformity
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Solution Overview
Problem
Existing display devices face challenges in maintaining uniform light emission and preventing pixel defects during the solution process for forming emission layers, particularly in organic light-emitting diode (OLED) displays, where the thickness and uniformity of emission layers can be affected by the solution process, leading to defects and non-uniform light distribution.
Innovation Solution
The display device arranges pixel groups in a zigzag pattern with a bank structure that includes a first and second bank, where via holes overlap the second bank, ensuring that emission layers are formed integrally within each pixel group, preventing defects from transferring between pixels and enhancing uniformity by controlling the solution's spread and thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If emission layers are formed individually for each pixel through solution process, then manufacturing precision of emission layer thickness can be improved, but productivity decreases and process complexity increases
Solution Approach 1:
The patent merges the emission layer formation process for multiple pixels into a single integral structure. By forming emission layers that span across multiple pixels simultaneously rather than individually, the manufacturing process achieves both high thickness uniformity (through integrated formation) and improved productivity (through reduced processing steps).
Solution Approach 2:
The patent segments the display panel into pixel groups, where emission layers are formed integrally within each group. This segmentation allows the solution process to be applied in controlled zones, ensuring uniform thickness while maintaining efficient batch processing across the entire panel.
2Productivity
If emission layers are formed integrally for pixel groups, then productivity and process simplicity are improved, but manufacturing precision of emission layer thickness may worsen
Solution Approach 1:
The patent applies local quality by forming emission layers with specific characteristics within defined pixel group regions. The integral emission layers are confined to specific pixel groups with banks acting as boundaries, ensuring that each region maintains optimal thickness uniformity while benefiting from the efficiency of integrated formation.
3Device complexity
If pixels are arranged in traditional grid pattern, then device complexity is reduced, but light emission uniformity across the panel worsens
Solution Approach 1:
The patent introduces asymmetry in the pixel arrangement by organizing pixels into zigzag-patterned groups rather than traditional rectangular grids. This asymmetric arrangement within pixel groups improves light emission uniformity across the display panel while maintaining manageable device complexity through the structured grouping approach.
Data Source
AI summary
A display device including a substrate in which pixel groups each composed of two or more pixels adjacent in a column direction are arranged; a circuit element layer in which driving transistors driving the pixels are arranged; electrodes placed on the circuit element layer, and electrically connected to the driving transistors through via holes, respectively; a bank surrounding each of the pixel groups, and placed to cover at least a part of an edge of the electrodes; and emission layers formed within areas surrounded by the bank, wherein the pixel groups are arranged in a zigzag shape with respect to a row direction.