Channel Detection Circuit for LED Open-Circuit Error Identification
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Solution Overview
Problem
Error detection circuits in LED-based devices face challenges in distinguishing between unused and broken LED channels, leading to incorrect detection and potential failure in identifying open-circuit issues.
Innovation Solution
A channel detection circuit comprising a disable circuit, LED pins, receivers, and an error detection circuit, where the disable circuit sends a disabling pulse to unused LED pins, allowing receivers to output inhibiting signals that inform the error detection circuit to bypass detection of these pins, thereby differentiating between unused and open-circuit channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If error detection circuit detects all LED pins for open-circuit, then detection coverage is improved, but false detection of unused channels as errors occurs
Solution Approach 1:
The disable circuit sends disabling pulses to unused LED pins before the error detection circuit performs its detection function. This preliminary action marks unused channels with a specific electrical state (pulled-down voltage) that the error detection circuit can recognize and distinguish from actual open-circuit failures, thereby preventing false positives while maintaining comprehensive detection coverage
Solution Approach 2:
The disable circuit acts as an intermediary between the system controller and the error detection circuit. It prepares the unused LED pins by applying disabling pulses that create a distinguishable electrical state, allowing the error detection circuit to differentiate between unused channels and actual failures without requiring direct communication about channel usage status
2Reliability
If error detection circuit ignores unused LED pins, then false positives are reduced, but detection of actual failures in used channels may be compromised
Solution Approach 1:
The error detection circuit applies different detection logic to different LED pins based on their usage status. For pins that received disabling pulses (unused channels), the circuit bypasses open-circuit detection. For pins that did not receive disabling pulses (used channels), the circuit performs normal open-circuit detection. This localized differentiation ensures both false positive reduction and maintained detection accuracy for actual failures
Solution Approach 2:
The system performs preliminary marking of unused channels through the disable circuit before error detection begins. This creates a pre-established distinction between unused and used channels, allowing the error detection circuit to selectively apply detection logic and ensure that actual failures in used channels are not missed while unused channels are appropriately excluded
3Measurement precision
If disabling pulse is sent to all LED pins, then all unused channels are marked, but used channels may be incorrectly affected
Solution Approach 1:
The LED pin set is segmented into two distinct groups: unused channels that receive disabling pulses from the disable circuit, and used channels that do not receive such pulses. This segmentation is achieved through selective enabling/disabling control based on channel usage configuration, allowing the error detection circuit to clearly distinguish between the two groups and apply appropriate detection logic to each, thereby avoiding interference with used channels while accurately marking unused ones
Data Source
AI summary
A channel detection device includes a disable circuit, LED pins, receivers and an error detection circuit. The disable circuit sends a disabling pulse to one or some LED pins of the plurality of LED pins, where the one or some LED pins are connected to the disable circuit. Each of the receivers is connected to one of the plurality of LED pins respectively and is capable of outputting an inhibiting signal when the LED pin connected receives the disabling pulse from the disable circuit. The error detection circuit is coupled to the receivers and the LED pins. The error detection circuit is configured to detect open-circuit of some LED pins of the plurality of LED pins, and bypass the detection of open-circuit of some other LED pin of which the receiver outputs the inhibiting signal.