Light-Emitting Display Spacer Structure Against Lateral Leakage
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Solution Overview
Problem
Lateral leakage current occurs between adjacent subpixels in light emitting display devices due to common layers formed in common, which are not effectively separated, leading to inefficiencies and increased resistance.
Innovation Solution
A light emitting display device with a structure on a bank that includes a first spacer structure with an inverse tapered shape, disconnecting common layers at its edges to prevent lateral leakage current without the need for a separate mask, and a second electrode with good step coverage formed on the common layers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If common layers are formed in common in pixels or subpixels to avoid use of fine metal mask, then manufacturing complexity is reduced, but lateral leakage current occurs between adjacent pixels or subpixels
Solution Approach 1:
The bank structure is divided into multiple patterns (first pattern, second pattern, third pattern) that are arranged to surround emission parts of adjacent subpixels. These segmented patterns create physical barriers that disconnect common layers at specific locations, preventing lateral leakage current while maintaining the common layer formation process without fine metal masks.
Solution Approach 2:
The bank patterns serve as intermediary structures between adjacent subpixels. These patterns are formed on the bank and act as mediating elements that physically separate and disconnect the common layers, thereby preventing harmful lateral leakage current while allowing the common layers to be formed in common across all subpixels.
2Reliability
If common layers extend two-dimensionally to cover pixels or subpixels, then electrical connectivity is improved, but current flows to adjacent pixels or subpixels causing lateral leakage
Solution Approach 1:
The bank patterns are strategically positioned to surround specific emission parts of adjacent subpixels, creating local discontinuities in the common layers only where needed. This local quality approach maintains electrical connectivity in regions where it is needed while preventing lateral leakage current at critical interfaces between adjacent subpixels.
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.