Video Device Connection Determination Using Resistor Networks
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Solution Overview
Problem
Existing video devices face challenges in determining error connections using video-signal cables due to the similarity in shape of input and output DP connectors, leading to potential misconnections and increased detection time in existing solutions.
Innovation Solution
A video device configuration with resistors and switches connected to signal lines, where the state of the switches and resistors determines the correct connection based on potential differences when the main power is turned on, allowing for simple and efficient error connection detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the existing solution uses HDP signal and AUX channel communication to detect error connections, then the detection can identify connection errors, but the detection process takes a certain time
Solution Approach 1:
The patent applies preliminary action by pre-configuring pullup resistors and pulldown resistors at the connector pins before connection occurs. When a cable is plugged in, the potential difference between signal lines is immediately established through these pre-positioned resistors, enabling instant error detection without waiting for communication protocols to execute.
Solution Approach 2:
The patent replaces the communication-based detection mechanism (HDP signal and AUX channel) with an electrical potential-based mechanism. By using resistors to create immediate voltage differences on signal lines, the system substitutes complex communication protocols with simple electrical potential measurement, achieving faster detection.
2Adaptability or versatility
If input and output DP connectors have the same shape for daisy-chain connectivity, then multiple video devices can be connected, but users may mistakenly connect connectors of the same type together
Solution Approach 1:
The patent applies asymmetry by configuring different resistor combinations (pullup and pulldown) at input and output connectors, creating distinct electrical characteristics for each connector type. Although the physical shape remains the same for daisy-chain compatibility, the electrical potential behavior differs, enabling users to correctly identify and connect connectors of the appropriate type.
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
Enables rapid and accurate determination of correct or incorrect connections, even when the destination device is not powered on, reducing user errors and detection time.
Implementation Method 1
a first resistor is provided in connection with the input connector while a third resistor is provided in connection with the output connector
Implementation Method 2
a first signal line, corresponding to one of a plurality of signal lines connected to the input connector, is connected to a first potential via a second resistor and a first switch
Data Source
AI summary
A video device includes at least one of an input connector and an output connector connectible with a video-signal cable, wherein the input connector is connected to a first resistor coupled with a predetermined potential and oppositely connected to a first signal line of the video-signal cable connected to a second resistor of a second video device, and wherein the output connector is connected to a third resistor coupled with a ground potential and oppositely connected to a second signal line of the video-signal cable connected to a fourth resistor of a third video device; and a connection determination part configured to determine a normal connection of the video-signal cable connected to the input connector based on a potential of the first signal line or to determine a normal connection of the video-signal cable connected to the output connector based on a potential of the second signal line.