Micro-LED Display Interconnect Layout for Short-Circuit Isolation
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Solution Overview
Problem
The challenge in producing high-resolution light display screens with micrometric light-emitting diodes is the difficulty in achieving accurate electrical connections without short-circuits due to the small distances between the diodes, especially for three-dimensional wire-shaped diodes, and ensuring precise positioning during transfer to a second support.
Innovation Solution
An optoelectronic device with a support, light elements fastened via a fastening element, featuring insulated primary and secondary conductive elements, and a first electrically insulating element that ensures electrical insulation and accurate connections through adaptive photolithography, allowing for robust and economical electrical connections despite varying topography.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light-emitting diodes are separated by a distance of less than about ten microns to increase display resolution, then display resolution is improved, but the risk of involuntary short-circuit between electrical connections increases
Solution Approach 1:
The patent introduces a vertical dimension by forming conductive elements at different heights above the substrate. Primary conductive elements are formed first, then an insulating layer is deposited, followed by secondary conductive elements that connect to light-emitting diodes from above. This multi-level vertical arrangement allows horizontal spacing between light-emitting diodes to be reduced while maintaining electrical isolation through the insulating layer, thereby achieving high display resolution without increasing short-circuit risk.
2Ease of manufacture
If conventional techniques are used for recovering electrical contacts on light elements, then manufacturing process is simple, but positioning faults are random and error range is too high relative to the dimensions of light elements and electrical connections
Solution Approach 1:
The patent applies preliminary action by pre-forming primary conductive elements on the substrate before transferring and positioning the light-emitting diodes. The primary conductive elements are created with predetermined patterns and positions, establishing a fixed reference framework. When light-emitting diodes are subsequently positioned and connected to these pre-formed conductive elements, any positioning deviations can be accommodated within the established conductive element patterns, significantly reducing positioning errors compared to conventional techniques where connections are formed after positioning.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides reliable electrical connections, reduces short-circuit risks, and enables high-resolution displays with cost-effective manufacturing, suitable for large surfaces, by using adaptive photolithography to compensate for positioning faults.
Implementation Method 1
at least one first electrically insulating element arranged at least in part around said at least one lateral wall of the light element and between at least one of the secondary conductive elements and at least one of the primary conductive elements so that said at least one secondary conductive element and said at least one primary conductive element separated by the first electrically insulating element are electrically insulated from each other
Implementation Method 2
at least one first connecting portion of at least one of the secondary conductive elements corresponding to said light element is formed in all or part of a first imprint obtained in the first electrically insulating element, at least one part of the first imprint being superimposed on the first electrode so that at least the first connecting portion of the secondary conductive element is in contact with the first electrode
Data Source
AI summary
An optoelectronic device for a light display including: a support; a light element with at least one first electrode; primary conductive elements; and secondary conductive elements. The device further includes a first electrically insulating element, wherein for said at least one light element, at least one first connecting portion of at least one of the secondary conductive elements corresponding to the light element is formed in all or part of a first imprint obtained in the first electrically insulating element. The first connecting portion of the secondary conductive element is in contact with the first electrode.