Series-Connected LED Display Electrode Layout With Non-Overlapping Insulation
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Solution Overview
Problem
Current display devices face challenges in achieving high light emission efficiency due to limitations in the connection and insulation of light emitting elements, which affects the overall luminance and reliability of the display panel.
Innovation Solution
The display device incorporates light emitting elements connected in series using contact electrodes, with a third insulation layer disposed between the contact electrodes that does not overlap the first end portion of the light emitting elements, enhancing light emission efficiency by preventing interference and ensuring effective electrical stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation layer is disposed on contact electrodes to ensure electrical stability, then reliability is improved, but light emission efficiency deteriorates due to overlap with light emitting elements
Solution Approach 1:
The patent applies local quality by making the insulation layer's optical properties position-dependent. The first region (under contact electrodes) provides insulation, while the second region (over light emitting elements) is transparent or has openings to allow light passage. This spatial differentiation of insulation properties resolves the contradiction between electrical stability and light emission efficiency.
Solution Approach 2:
The insulation layer is segmented into functionally distinct regions: a first region for electrical insulation and a second region for light transmission. This segmentation allows each region to optimize its function independently, preventing the insulation structure from uniformly blocking light while maintaining electrical stability.
2Device complexity
If contact electrodes are used to connect light emitting elements in series, then device complexity is reduced, but manufacturing precision deteriorates due to alignment requirements
Solution Approach 1:
The patent merges the insulation function and the light transmission function into a single insulation layer structure. By integrating both functions into one layer with spatially varying properties, the number of separate components is reduced, simplifying the overall structure while maintaining alignment precision through the unified design.
Data Source
AI summary
A display device includes: a first electrode and a second electrode spaced apart from each other; first and second light emitting elements between the first electrode and the second electrode; a first contact electrode contacting the first electrode and a first end portion of the first light emitting element; a second contact electrode contacting a second end portion of the first light emitting element; a third contact electrode contacting the second contact electrode and a first end portion of the second light emitting element and overlapping the first electrode; and a fourth contact electrode contacting a second end portion of the second light emitting element and overlapping the second electrode. The first contact electrode and the third contact electrode are on the same layer.