Redundant Pixel Cavity Layout for Uniform LED Display Emission
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Solution Overview
Problem
Existing display devices with self-luminous light emitters like LEDs face issues of manufacturing yield reduction due to defective emitters and non-uniformity in image quality caused by differences in light intensity distribution when regular and redundant emitters are driven.
Innovation Solution
A display device with a cavity structure featuring multiple pixel units, each containing a first and second light emitter arranged in the same pattern, where one emitter is redundant to prevent non-emission states and reduce non-uniformity by adjusting which emitter is driven based on a drive controller's proportionate control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single light emitter is used per pixel unit, then the device complexity is reduced, but the manufacturing yield decreases due to defective emitters
Solution Approach 1:
The patent applies preliminary action by pre-configuring redundant light emitters in each pixel unit before operation. The redundant emitters are positioned and electrically connected in advance, so that when a defect is detected during operation, the system can immediately switch to the redundant emitter without requiring complex real-time reconfiguration or repair actions.
Solution Approach 2:
The patent changes the operational parameter of the light emitters by selectively driving either the first or second light emitter based on defect detection. The drive controller monitors the emission status and dynamically switches which emitter is active, changing the operational state from single-emitter to dual-emitter configuration with selective activation.
2Reliability
If redundant light emitters are added to prevent non-emission states, then the manufacturing yield is improved, but the device complexity increases
Solution Approach 1:
The patent applies asymmetry by implementing redundancy only at the pixel unit level rather than requiring full system-level redundancy. The asymmetric configuration allows some pixel units to have redundant emitters while maintaining overall system simplicity. Additionally, the drive controller selectively activates redundant emitters only when needed, creating an asymmetric operational state that balances reliability and complexity.
3Reliability
If regular and redundant emitters are driven with different intensity distributions, then the redundant structure provides backup capability, but non-uniformity in image quality increases
Solution Approach 1:
The patent applies local quality by ensuring that both the first and second light emitters in each pixel unit have identical local emission characteristics and intensity distributions. This is achieved by using emitters with matching specifications and positioning them symmetrically within their respective cavities, so that regardless of which emitter is active, the local image quality remains uniform.
Solution Approach 2:
The patent uses preliminary action by pre-matching the intensity distributions of paired light emitters during manufacturing. The emitters are selected and positioned in advance to ensure identical emission characteristics, so that when switching between regular and redundant emitters, no noticeable difference in image uniformity occurs.
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
This configuration enhances manufacturing yield and reduces non-uniformity in display images by ensuring that either the first or second light emitter is driven, maintaining image quality and efficiency.
Implementation Method 1
display device including self-luminous light emitters such as light-emitting diodes (LEDs)
Data Source
AI summary
A display device includes a cavity structure and a plurality of pixel units. The cavity structure includes a display surface and a plurality of cavities in the display surface. Each pixel unit of the plurality of pixel units includes a first light emitter and a second light emitter located in a corresponding cavity of the plurality of cavities. The first light emitter and the second light emitter are arranged in a same pattern in each cavity of the plurality of cavities. The each pixel unit of the plurality of pixel units includes a redundant structure configured to cause one of the first light emitter and the second light emitter to be driven to emit light. The first light emitter and the second light emitter are different in that they are driven according to the each pixel unit.