Display Device HDCP Virtual ID Repeater Receiver Mode Switch
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Solution Overview
Problem
Display devices that operate as HDCP repeaters face a compatibility issue where they fail to output a screen when switching from a repeater mode to a receiver mode without rebooting, leading to user inconvenience due to the inability to receive image signals from the transmitter.
Innovation Solution
Incorporating a virtual ID transmission module within the control unit to transmit a virtual ID to the first external device when the second external device is not connected, allowing the display device to operate in different modes (receiver, transmitter, or repeater) and maintain compatibility by simulating the presence of a connected device, thus enabling image output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the display device operates as an HDCP repeater and then switches to receiver mode without rebooting, then the device maintains operational continuity, but the screen is not output because the transmitter does not transmit images
Solution Approach 1:
The control unit transmits a virtual ID to the first external device in advance when the second external device is not connected. This preliminary action prepares the HDCP authentication pathway ahead of time, ensuring that when the display device switches from repeater to receiver mode, the authentication can proceed smoothly without requiring a reboot, thus maintaining both operational continuity and screen output reliability
Solution Approach 2:
A virtual ID is introduced as an intermediary element to bridge the authentication gap when the second external device is disconnected. This virtual ID acts as a placeholder that allows the first external device to authenticate with the display device in receiver mode, resolving the contradiction between maintaining operational continuity and ensuring reliable screen output
2Adaptability or versatility
If the display device operates as an HDCP repeater, then content can be transmitted between external devices, but compatibility problems occur when switching to receiver mode
Solution Approach 1:
The display device dynamically adjusts its HDCP operation mode between repeater and receiver modes based on connection status. The control unit monitors whether the second external device is connected and accordingly switches modes while transmitting a virtual ID when in receiver mode without the second device, enabling flexible adaptability while maintaining compatibility reliability through proactive virtual ID transmission
Data Source
AI summary
The present disclosure relates to a display device and an operating method thereof, which improve a problem in which a screen is not output when operating as a receiver after operating as an HDCP repeater, the display device comprises a display unit and a control unit configured to: receive a signal from a first external device and transmit the signal to a second external device so that an image according to the signal received from the first external device is output from the second external device, wherein the control unit is further configured to transmit a virtual ID to the first external device if the second external device is not connected.