Video Display Device EDID Rewriting for HDMI Connection Failure
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Solution Overview
Problem
Existing video display systems fail to execute a display automatic detection procedure when an initial connection between a video transmission device and a video display device via a digital interface, such as HDMI, results in no display, even when using an OSD mode.
Innovation Solution
A video display device and system that includes a memory for storing display recognition data in multiple formats, a response unit for replying to connection signals, and a control unit that resets the response signal output by rewriting the initial read data into another format when a display recognition command is accepted, allowing for re-detection of compatible video formats.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the video transmission device reads EDID data one-sidedly from the display device using DDC control signal, then the display device can provide displayable video format information, but the system cannot execute display automatic detection procedure when initial connection fails
Solution Approach 1:
The patent makes the EDID data dynamic by allowing the display device to change the format of displayable video information based on reception of a display recognition command. The control unit rewrites initial read data into display side recognition data in another format, enabling the system to adaptively retry connection with different formats rather than being static with fixed EDID data
Solution Approach 2:
The patent changes the parameter of display side recognition data format in response to connection failures. When the accepting unit receives a display recognition command, the control unit rewrites the initial read data into another format stored in the memory, thereby changing the video format parameters to enable successful connection
2Adaptability or versatility
If the display device stores display side recognition data in multiple formats, then it can support various video formats, but it cannot switch formats automatically when connection fails
Solution Approach 1:
The display device performs self-service by automatically switching formats when it receives a display recognition command. The control unit autonomously rewrites the initial read data into another format from the stored display side recognition data, enabling the system to self-correct connection failures without manual intervention
Solution Approach 2:
The patent implements a feedback mechanism where the display device monitors connection status through the display recognition command and automatically adjusts the video format in response. The control unit uses the received command as feedback to trigger format switching, creating a closed-loop system that adapts based on connection outcomes
Data Source
AI summary
A video display system is a system in which a video transmission device 10 and a video display device 20 are connected via an HDMI 1. The video display device 20 includes an EDID memory 25 in which display side recognition data in plural formats are stored and one of them is set as an initial read data, a response unit 23 replying an HPD for a connection signal (power+5 V) inputted from the video transmission device 10 via the HDMI 1 and the initial read data of the EDID memory 25, and a control unit 24 resetting an output of the HPD after replacing the initial read data into the data of the EDID memory 25 in another format when a display recognition command from a remote controller 30 is accepted.