Switching Circuit Cable Defect Detection in Image Display Apparatus
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Solution Overview
Problem
It is challenging to determine whether a cable connected to an image display apparatus is defective, as the apparatus may display flickering images or fail to display images, making it difficult to distinguish between cable and external apparatus defects.
Innovation Solution
The image display apparatus incorporates a switching circuit with multiple input terminals and a signal processor that compares output and input signals when a cable is connected between terminals, determining cable defects based on signal differences exceeding a predetermined value, and displays a defect message.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cable is connected between input terminals to enable signal transmission, then the image display apparatus can receive external signals, but it becomes difficult to determine whether the cable or external apparatus is defective when no signal is received
Solution Approach 1:
The switching circuit performs preliminary actions by automatically switching between receiving modes (normal external signal reception and self-generated test signal transmission) to proactively detect cable defects before they cause display issues. The circuit preemptively tests cable integrity by comparing transmitted and received signals, resolving the detection difficulty without user intervention.
Solution Approach 2:
The image display apparatus performs self-diagnosis by using its own switching circuit to generate test signals, transmit them through the connected cable via the input terminal, and compare the returned signals. This self-service mechanism automatically identifies cable defects without requiring external testing equipment or user expertise.
2Reliability
If the switching circuit outputs test signals to detect cable defects, then cable connectivity can be verified, but the normal signal reception function may be interrupted
Solution Approach 1:
The switching circuit implements periodic action by alternating between normal receiving mode and test signal transmission mode. It periodically switches to transmit test signals through the input terminal to detect cable defects, then returns to normal reception. This periodic switching ensures reliable cable verification while minimizing interruption to signal reception functionality.
Data Source
AI summary
The present disclosure relates to an image display apparatus. The image display apparatus according to one embodiment of the present disclosure comprises a plurality of input terminals; and a switching circuit including a first receiving end to receive a signal through a first input terminal among the plurality of input terminals, a second receiving end to receive a signal through a second input terminal among the plurality of input terminals, a first transmitting end to transmit a signal received through the first or the second receiving end to a signal processor, and a second transmitting end to output an output signal to the first input terminal in response to a cable being connected between the first and the second input terminal, and a signal being not received. Accordingly, it is possible to determine whether a cable connected to an input terminal is defective.