Display Device Encryption Key Loop Detection
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Solution Overview
Problem
In video display systems with daisy-chained projectors, the lowest level display device is not correctly determined in loop-connected configurations, leading to issues with image display due to repeater functions using terminal specifications.
Innovation Solution
A display device that transmits its unique encryption key and keys from lower-level devices to upper-level devices in a daisy chain, with a stop instruction unit to prevent repeated transmission of encryption keys, ensuring correct image display by determining the terminal device in loop-connected systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple display devices are loop-connected in a daisy-chain configuration, then information sharing and video presentation at distance is enabled, but the lowest level display device cannot be determined and image display fails
Solution Approach 1:
The transmitting device performs preliminary actions by sending its own encryption key and received encryption keys to the receiving device before image display is attempted. This allows the receiving device to determine whether it is the lowest level device by checking if it receives its own encryption key from another device, thereby preventing the image display failure that would occur in a loop connection.
Solution Approach 2:
The system implements a feedback mechanism where the receiving device checks whether the received encryption key group includes its own encryption key. If it does, this feedback indicates that the device is the lowest level device in the daisy-chain connection, allowing the system to correctly identify the terminal device and enable proper image display despite the loop connection configuration.
2Ease of operation
If repeater function transmits encryption keys through multiple devices, then daisy-chain connection is maintained, but encryption keys are repeatedly transmitted causing display errors
Solution Approach 1:
The receiving device uses feedback by checking whether the received encryption key group includes its own encryption key. This feedback mechanism allows the device to determine if it is the lowest level device and prevents the repeated transmission of encryption keys that would cause display errors, while maintaining the ease of daisy-chain connection.
Solution Approach 2:
The system extracts the essential information (encryption key) from the transmission stream and processes it selectively. The receiving device extracts its own encryption key from the received group and uses this extracted information to determine its position in the daisy-chain, preventing unnecessary repeated transmission and ensuring accurate key delivery.
Data Source
AI summary
A display device connected to a signal source outputting a video signal using an encryption protocol and that transmits the encryption key to the signal source includes: a transmission unit that transmits an own encryption key uniquely set for the display device and an encryption key transmitted from another display device connected to the display device as a lower device to the signal source and another display device connected as an upper device; and a stop instruction unit that instructs another display device corresponding to a predetermined encryption key included in an encryption key group based on the order of the own encryption keys included in the encryption key group to stop transmitting the encryption key received when the own encryption key is included in the encryption key group including a plurality of encryption keys transmitted from another display device connected as the lower device.