Parallel Redundant Chiplet System for Display Reliability
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Solution Overview
Problem
Existing display systems lack reliable redundancy in both light emitters and control circuits, leading to potential failures and reduced manufacturing yields, as prior designs often require additional space for test or control circuits to switch between elements, and may have common controllers that can fail.
Innovation Solution
A parallel redundant integrated-circuit system with separate and distinct active circuits connected in parallel, eliminating the need for interconnections or control/test circuits, ensuring redundancy without additional space, and using micro transfer printing for manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If redundant light emitters are provided with separate control circuits, then reliability is improved, but device complexity and space requirements increase
Solution Approach 1:
Multiple redundant light emitter circuits share a single common control circuit. The control circuit is capable of driving multiple light emitter circuits through shared control signal lines, eliminating the need for separate control circuits for each redundant emitter. This merging approach maintains reliability through redundancy while reducing overall system complexity.
Solution Approach 2:
The common control circuit is designed with universal functionality to control multiple light emitter circuits. It can selectively activate any of the redundant light emitter circuits based on failure detection, making the control circuit multi-functional rather than dedicated to a single emitter circuit.
2Reliability
If additional space is allocated for test or control circuits to switch between elements, then reliability is improved, but manufacturing area and cost increase
Solution Approach 1:
The control signals for multiple redundant light emitter circuits are merged into shared control signal lines. This consolidation reduces the total area required for control circuitry and interconnections, as the same control lines serve multiple circuits simultaneously rather than requiring dedicated lines for each circuit.
Solution Approach 2:
The patent organizes light emitter circuits in a spatial arrangement where redundant circuits are positioned adjacent to each other, allowing shared control lines to efficiently service multiple circuits. This spatial optimization reduces the overall footprint required for control infrastructure.
3Device complexity
If common controllers are used to control multiple light emitters, then device complexity is reduced, but reliability decreases due to single point of failure
Solution Approach 1:
The control system is segmented into modular light emitter circuits that can operate independently. Each light emitter circuit is designed as a self-contained unit that can be individually activated or deactivated. This segmentation allows the system to maintain functionality even if one circuit fails, as other circuits can continue to operate without being affected by the failure of the common controller.
Solution Approach 2:
The system incorporates redundant light emitter circuits as a preemptive measure against failures. Before a failure occurs, backup circuits are already in place and can be activated upon detection of a failure in the primary circuit. This beforehand cushioning ensures continuous operation and maintains reliability despite the use of a common controller.
Data Source
AI summary
A parallel redundant integrated-circuit system includes an input connection, an output connection and first and second active circuits. The first active circuit includes one or more first integrated circuits and has an input connected to the input connection and an output connected to the output connection. The second active circuit includes one or more second integrated circuits and is redundant to the first active circuit, has an input connected to the input connection, and has an output connected to the output connection. The second integrated circuits are separate and distinct from the first integrated circuits.