Display Device Conductive Structures for LED Mass Transfer Alignment
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Solution Overview
Problem
The mass transfer technique for light emitting diodes (LEDs) in display devices is prone to transposition errors, affecting display quality due to the need for LEDs to rotate and match pixel circuit configurations, leading to impedance issues.
Innovation Solution
A display device design that includes multiple pixel circuits and conductive structures with overlapping light emitting diodes, where the LEDs are electrically connected through conductive structures and a protective layer, allowing for consistent alignment and rotation without requiring individual LED rotation to match the pixel circuit, thereby reducing transposition errors and impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting diodes are rotated to match the configuration of the pixel circuit during mass transfer, then the alignment with pixel circuits is improved, but transposition errors occur affecting display quality
Solution Approach 1:
Instead of rotating the LEDs to match the pixel circuit configuration, the patent inverts the approach by designing the pixel circuit configuration to match the LED arrangement. The conductive structures are extended and configured to connect with LEDs in their transferred orientation, eliminating the need for rotation and preventing transposition errors while maintaining alignment precision.
2Manufacturing precision
If light emitting diodes are rotated individually to match pixel circuit configuration, then alignment is achieved, but impedance increases
Solution Approach 1:
The patent merges the conductive structures by extending them to simultaneously connect multiple LEDs that are adjacent in the mass transfer arrangement. This consolidation reduces the total number of separate connections required, lowering overall impedance while maintaining proper alignment between LEDs and pixel circuits without individual rotation.
Data Source
AI summary
A display device includes a substrate, a first pixel circuit, a second pixel circuit, a third pixel circuit, a protective layer, a first conductive structure, a second conductive structure, a third conductive structure, first light emitting diodes (LEDs), second LEDs and third LEDs. The first pixel circuit, the second pixel circuit and the third pixel circuit are located on the substrate. The second pixel circuit is located between the first pixel circuit and the third pixel circuit. The protective layer covers the first pixel circuit, the second pixel circuit and the third pixel circuit. The first conductive structure is electrically connected to the first pixel circuit through the first opening of the protective layer. The first LEDs are overlapped with the first pixel circuit and the second pixel circuit. The first LEDs are electrically connected to the first conductive structure.