Display Device Daisy-Chain Video Signal Consistency
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Solution Overview
Problem
Multisystem display devices connected in a daisy chain configuration cannot incorporate video relevant information from HDMI signals into video signals output at DP, leading to inconsistencies in video display between stages, such as gradation range and scaling issues.
Innovation Solution
A display device system with a video input part, communication controller, video signal determination part, and video signal adjustment part that receives communication data from other devices to adjust video signals based on detected changes in video input signals, ensuring consistent display across multiple devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If video input signals are converted between different interfaces in daisy-chain connected display devices, then video distribution is simplified and device complexity is reduced, but video relevant information is lost during conversion
Solution Approach 1:
The patent introduces a communication controller as an intermediary component that receives video relevant information from the video input signal and transmits it through the communication interface to subsequent display devices. This mediator bridges the gap between HDMI input signals and DP output signals, ensuring that video relevant information is preserved across interface conversions without adding complexity to the video signal path itself.
2Ease of operation
If DP interface is used for video output in daisy-chain connection, then device compatibility and ease of operation are improved, but video relevant information cannot be incorporated into output signals
Solution Approach 1:
The patent separates the video signal transmission function from the information transmission function. The video signal (DP interface) and video relevant information (communication data) are transmitted through separate channels. This segmentation allows the system to use the convenient DP interface for video output while simultaneously preserving video relevant information through a dedicated communication path.
3Device complexity
If video relevant information is not transmitted to latter-stage displays, then device complexity is reduced, but display consistency and manufacturing precision deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where video relevant information from the input signal is transmitted through the communication controller to subsequent display devices. This feedback loop ensures that all displays in the daisy-chain connection receive the necessary information to maintain consistent video display settings, including gradation range and scaling parameters, across the entire system.
Data Source
AI summary
A display device includes a video input part for receiving video signals based on video input signals received by another display device, a communication controller for receiving communication data, representing any change occurring in video input signals, from another display device, a video signal determination part for determining video signals input by the video signal input part based on communication data received by the communication controller, and a video signal adjustment part for adjusting video signals based on the result of determination made by the video signal determination part.