Distributed LED Driver Redundancy for Compact Display Fault Tolerance
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Solution Overview
Problem
Current LED driver circuitry for display devices requires significant external chip area, impacting the size of the display device and lacks effective fault tolerance, leading to potential operational failures due to single-point faults.
Innovation Solution
A display device architecture with distributed driver circuits and redundant driver circuits that can switch to a fault mode, allowing adjacent driver circuits to reconfigure and continue operation even if one driver circuit fails, thereby reducing the likelihood of failure and enabling a more compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If driver circuits are distributed across the display device, then the chip area required is reduced, but the reliability decreases due to potential single-point faults
Solution Approach 1:
The patent implements preliminary fault detection during the addressing phase before normal display operation begins. Each driver circuit is tested by attempting to write to its associated LED zone, and fault status is stored in advance. This allows the system to prepare redundancy configurations before actual failures occur, maintaining reliability while using distributed architecture.
Solution Approach 2:
The patent incorporates redundant driver circuits that remain in standby mode during normal operation. When a fault is detected in a primary driver circuit, the system switches to using the redundant driver circuit to drive the affected LED zone. This beforehand cushioning through redundancy compensation allows the distributed architecture to maintain reliability despite individual circuit failures.
2Reliability
If redundant driver circuits are added for fault tolerance, then the reliability improves, but the device complexity increases
Solution Approach 1:
The patent merges the functionality of primary and redundant driver circuits by implementing a unified control structure. The same control circuit manages both operational modes (normal and fault mode), and the driver circuits share common addressing and control pathways. This merging reduces overall system complexity despite adding redundancy, as the redundant circuits integrate seamlessly into the existing architecture rather than requiring separate independent systems.
Solution Approach 2:
The patent implements dynamic switching between normal operation mode and fault mode based on real-time fault detection. The system adapts its configuration by enabling or disabling specific driver circuits depending on their operational status. This dynamic behavior allows the system to maintain simplicity during normal operation while automatically activating redundancy only when needed, thus balancing reliability improvement with complexity management.
3Productivity
If all driver circuits operate in first mode simultaneously, then the productivity is maximized, but the stability decreases due to lack of fault coverage
Solution Approach 1:
The system performs preliminary fault detection during the addressing phase before transitioning to normal display operation. By checking the status of all driver circuits in advance and storing fault information, the system ensures that productivity is maximized during normal operation while stability is maintained through pre-identified fault conditions that can be handled by redundancy mechanisms when they occur.
Solution Approach 2:
The patent ensures continuous display operation by implementing automatic switching capabilities. When a driver circuit fault is detected, the system continuously maintains display functionality by transitioning to fault mode and utilizing redundant driver circuits. This continuity of useful action ensures that productivity is sustained without interruption, while stability is maintained through the always-available redundancy configuration that activates seamlessly when needed.
Data Source
AI summary
Embodiments relate to a display device that includes a control circuit, an array of light emitting diode (LED) zones, and an array of zone integrated circuits that are distributed in the display area. The zone integrated circuits may comprise integrated a LED, driver circuits, and at least one redundant driver circuit. A non-operational driver circuit is bypassed, and the LED driving responsibility is assumed by the neighboring driver circuit. The neighboring driver circuit may be another one of the driver circuits or the redundant driver circuit.