Micro LED Pixel Redundancy With Common Connection Repair
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Solution Overview
Problem
Liquid crystal display apparatuses suffer from design limitations and reduced luminance and response speed due to the use of a backlight unit, while organic light emitting display apparatuses are vulnerable to moisture and have reliability issues, and micro LED display apparatuses face defects leading to decreased reliability.
Innovation Solution
A micro LED display apparatus with a pixel design that includes a first and second light emitting device connected via a common connection pattern, allowing for redundancy and repair of defective pixels, and a third light emitting device connected between a driving power line, reducing power consumption and improving reliability through laser repair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a micro LED display apparatus uses a conventional pixel design without redundancy, then the device complexity is reduced, but the reliability decreases due to defective pixels
Solution Approach 1:
The patent applies preliminary action by pre-configuring redundant light emitting devices and alternative connection paths (common connection patterns) in the pixel structure before defects occur. When a defect is detected, the system can immediately switch to the pre-prepared redundant components without requiring complex repair operations, thus improving reliability while controlling complexity.
Solution Approach 2:
The patent changes the structural parameters of the pixel by introducing multiple light emitting devices (first, second, and third light emitting portions) and alternative electrical connection paths. This parameter change enables the pixel to tolerate defects by providing backup pathways, resolving the contradiction between reliability and complexity.
2Reliability
If a micro LED display apparatus implements comprehensive pixel repair capabilities, then the reliability and yield are enhanced, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent prepares redundant light emitting devices and alternative connection patterns in advance during manufacturing. This preliminary action allows defects to be corrected by simply activating pre-configured backup components rather than performing complex repairs, thereby enhancing reliability while maintaining manufacturing ease.
Solution Approach 2:
The patent uses copying by creating redundant copies of light emitting devices and connection patterns within each pixel. These copied structures serve as backups that can be activated when primary components fail, improving reliability without requiring complex manufacturing processes.
3Use of energy by moving object
If a micro LED display apparatus uses standard connection patterns without overlap, then the manufacturing precision is easier to control, but the power consumption increases
Solution Approach 1:
The patent transitions from a two-dimensional planar connection pattern to a three-dimensional overlapping structure where connection patterns are positioned at different vertical levels. This dimensional change allows the connection patterns to overlap in the vertical dimension while maintaining horizontal separation, reducing power consumption through shorter current paths without compromising manufacturing precision.
Data Source
AI summary
A light emitting diode display apparatus includes a pixel disposed on a substrate and configured to display an image. The pixel includes a pixel circuit configured to connect to a data line and a first driving power line, a first light emitting portion including a first light emitting device configured to connect to the pixel circuit, a second light emitting portion including a second light emitting device configured to connect to the pixel circuit, and a common connection pattern configured to connect the first light emitting device and the second light emitting device in common. Each of the first light emitting device and the second light emitting device includes a first terminal connected to the pixel circuit and a second terminal connected to the common connection pattern.