Light-Emitting Pixel Isolation With Dual Trench Depths for Smaller Pixels
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Solution Overview
Problem
Existing organic light emitting apparatuses face challenges in maintaining breakdown voltage while reducing pixel size, leading to potential degradation of display quality due to leakage currents between pixels.
Innovation Solution
The solution involves a light emitting apparatus with a pixel array where each pixel includes a first trench-type isolation portion to isolate regions with different conductivity types and a second trench-type isolation portion to isolate regions with the same conductivity type, with the second isolation portion having a larger depth than the first.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the isolation width between transistors is reduced to decrease pixel size, then the pixel density and resolution are improved, but the breakdown voltage cannot be maintained and leakage current between pixels increases
Solution Approach 1:
The isolation structure is segmented into two distinct types: first isolation portions for isolating regions with different conductivity types, and second isolation portions for isolating regions with the same conductivity type. This segmentation allows each isolation portion to be optimized for its specific function, enabling reduced isolation width while maintaining breakdown voltage through the complementary action of both isolation types.
Solution Approach 2:
Different isolation portions are assigned different depths based on their specific isolation needs. The first isolation portions and second isolation portions have different depths, creating local quality variations that optimize the breakdown voltage characteristics in different regions. This local differentiation allows the overall pixel size to be reduced while maintaining reliability in critical areas.
2Area of moving object
If the isolation width between transistors is reduced to decrease pixel size, then the pixel density is improved, but leakage current between pixels increases causing display quality degradation
Solution Approach 1:
The isolation structure is divided into first isolation portions and second isolation portions with different functions. The second isolation portions specifically target leakage current suppression between pixels with the same conductivity type, while first isolation portions handle regions with different conductivity types. This segmentation enables effective leakage current suppression with reduced isolation width.
Solution Approach 2:
The different depths of first and second isolation portions create localized quality improvements in specific regions where leakage current is most problematic. The second isolation portions extend deeper to provide enhanced isolation where needed, suppressing leakage current without requiring increased isolation width across the entire pixel structure.
Data Source
AI summary
The present invention provides a light emitting apparatus comprising a plurality of pixels arranged in a substrate, wherein each of the plurality of pixels includes a first isolation portion configured in a trench-type to isolate two adjacent regions having different conductivity types from each other, and a second isolation portion configured in a trench-type to isolate two adjacent regions having the same conductivity type as each other, and a depth of the second isolation portion is larger than a depth of the first isolation portion.