Micro LED Redundancy Layout for High-Resolution Pixel Defects
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Solution Overview
Problem
In micro light-emitting display devices, the large area required for transfer of light-emitting elements in flip chip or lateral chip schemes makes it difficult to apply redundant light-emitting elements to high-resolution panels, leading to a high incidence of defective pixels.
Innovation Solution
A display device design where redundant light-emitting elements are disposed corresponding to main light-emitting elements, connected via a connection electrode with opposite polarities, allowing for efficient application to high-resolution panels and reducing pixel defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If flip chip or lateral chip scheme is used for light-emitting element transfer, then the light-emitting element can be transferred and mounted, but the area required for transfer becomes large, making it difficult to apply redundant light-emitting elements to high-resolution panels
Solution Approach 1:
The patent transitions from horizontal/planar transfer schemes (flip chip, lateral chip) to a vertical stacking arrangement where the redundant light-emitting element is positioned directly above or below the main light-emitting element. This dimensional change allows the redundant element to occupy space in the Z-direction rather than requiring additional lateral transfer area, enabling high-resolution panel applications while maintaining redundancy for defect compensation
2Reliability
If redundant light-emitting elements are not applied to high-resolution panels, then the panel can be manufactured with high resolution, but a large number of defective pixels occur
Solution Approach 1:
The patent combines the main light-emitting element and the redundant light-emitting element into a single integrated structure where both elements share common support structures, electrical connections, and mounting infrastructure. The redundant element is positioned in close proximity to the main element, allowing them to function as a unified assembly. This merging approach adds redundancy functionality without proportionally increasing overall device complexity
Solution Approach 2:
The patent creates a redundant copy of the light-emitting element structure that mirrors the main element's configuration. This copied redundant element is positioned adjacent to or above the main element and can be activated to replace defective pixels. The copying approach provides a straightforward method to achieve defect compensation while maintaining structural consistency and manageable complexity
Data Source
AI summary
Disclosed is a display device in which a redundant light-emitting element is applicable to a micro light-emitting display device to which a high-resolution panel is applied. The display device includes at least one light-emitting element; and at least one redundant light-emitting element respectively disposed in a manner corresponding to the at least one light-emitting element, wherein a first electrode of the light-emitting element is connected to a second electrode of the redundant light-emitting element via a connection electrode. Thus, even when the light-emitting element is defective, light of a corresponding color thereto is emitted normally from the redundant light-emitting element. Thus, a failure of each pixel may be lowered.