Loop Spacer Structure for Subpixel Leakage Isolation
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Solution Overview
Problem
Light emitting display devices face challenges with lateral leakage current due to common layers extending two-dimensionally between adjacent subpixels, which affects the display's efficiency and image quality.
Innovation Solution
A light emitting display device structure is implemented, featuring a substrate with subpixels, a bank, first electrodes, a first spacer structure with an inverse tapered shape, a common layer structure disconnected at the edge of the spacer, and a second electrode. This configuration separates common layers into subpixel regions without a separate mask, reducing lateral leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If common layers are formed in common in pixels or subpixels without a fine metal mask, then manufacturing complexity is reduced, but lateral leakage current increases between adjacent subpixels
Solution Approach 1:
The invention introduces isolation structures (such as insulating layers or patterned structures) between adjacent subpixels within the common layers. These structures segment the continuous common layers into discrete regions, preventing current from flowing laterally between neighboring subpixels while maintaining the common layer configuration across all subpixels.
Solution Approach 2:
The invention employs intermediary insulating structures or barrier layers positioned between adjacent subpixels. These intermediary elements act as current barriers that block lateral leakage current while allowing the common layers to remain continuous across the display structure, thus resolving the contradiction between manufacturing simplicity and current isolation.
2Device complexity
If common layers extend two-dimensionally across adjacent subpixels, then device structure is simplified, but current isolation between subpixels deteriorates
Solution Approach 1:
The continuous two-dimensional common layers are segmented by introducing isolation structures at specific locations between subpixels. This segmentation creates electrically isolated regions within the common layers, ensuring proper current confinement to each subpixel while maintaining the overall simplified layer architecture.
Solution Approach 2:
The invention applies local quality modification by introducing insulating or barrier properties at specific locations (between subpixels) while maintaining the conductive properties of common layers in other regions. This localized modification ensures current isolation where needed while preserving the electrical functionality of common layers in active areas.
Data Source
AI summary
Disclosed is a light emitting display device which may prevent or at least reduce lateral leakage current. The light emitting display device includes a substrate comprising a plurality of first to third subpixels arranged to neighbor one another, each of the first to third subpixels comprising an emission part and a non-emission part to surround the emission part; a bank at the non-emission parts; first electrodes covered with the bank and respectively at the first to third subpixels to expose the respective emission parts; a first spacer structure having an inversed tapered shape configured to surround at least one side of each of the emission parts of the first to third subpixels on the bank; a common layer structure located on the first electrodes and the first spacer structure and disconnected at an edge of the first spacer structure; and a second electrode on the common layer structure.