Display Device High-Speed Input Switching Timing Synchronization
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Solution Overview
Problem
In display devices with high-speed input switching functions, timing deviations occur when switching between video signals from external output non-correspondence and correspondence video input terminals, leading to disturbances during the switching process.
Innovation Solution
A display device with a reception unit that receives video signals and timing signals from both terminals, and a control unit that acquires and processes timing signals to synchronize video processing, preventing timing deviations during high-speed input switching by using a timing signal specific to the video signal state, whether displayed or not.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed input switching function is used to switch between video signals from external output non-correspondence input terminal and external output correspondence input terminal, then input switching speed is improved, but timing deviation occurs causing disturbance
Solution Approach 1:
The system performs preliminary actions by preparing timing signals in advance for both the external output non-correspondence input terminal and the external output correspondence input terminal. Before switching occurs, the timing signal for the non-display video (from correspondence terminal) is already acquired and ready, allowing seamless transition without timing deviation when switching between inputs during high-speed input switching function operation.
2Adaptability or versatility
If reception unit mode is switched between non-correspondence and correspondence input terminals, then input versatility is improved, but timing stability deteriorates due to temporary signal output stop
Solution Approach 1:
The reception unit acts as an intermediary that simultaneously receives and processes timing signals from both the external output non-correspondence input terminal and the external output correspondence input terminal. By maintaining this intermediary role during mode switching, the system ensures continuous timing signal availability without interruption, preventing timing instability while accommodating versatile input terminal usage.
Solution Approach 2:
The system acquires the timing signal for the non-display video in advance before mode switching occurs. This preliminary acquisition ensures that when the reception unit switches between handling external output non-correspondence input terminal and external output correspondence input terminal, the timing signal is already prepared and continuously available, maintaining timing stability throughout the transition.
Data Source
AI summary
A display device includes: a reception unit to receive a video signal input from an external output correspondence input terminal and a timing signal corresponding to the video signal; a video processing unit to perform processing on a video signal input from an external output non-correspondence input terminal and the video signal, acquired from the reception unit, input from the external output correspondence input terminal; and a control unit to acquire the timing signal supplied from the reception unit as a timing signal corresponding to a video signal of non-display in a state that a displayed video is based on the video signal input from the external output non-correspondence input terminal, and the video signal of non-display input from the external output correspondence input terminal at that time is acquired by the reception unit in a case of performing a process of a high-speed input switching function for switching between the video signal input from the external output non-correspondence input terminal and the video signal input from the external output correspondence input terminal.