Display Controller Variable Search Time HDMI Signal Detection
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Solution Overview
Problem
Existing display apparatuses face challenges in properly setting the time for determining the presence/absence of video signals during the auto search function, as the time required for signal output varies significantly among devices, leading to potential misidentification of video signals and inefficient use of time, especially when devices with fast signal output are delayed.
Innovation Solution
A display apparatus with a controller that sets a variable search time for digital video signals based on the presence or absence of power supply and connection status, adjusting the search time according to the authentication process stages of HDCP and TMDS, allowing for proper detection of HDMI signals and other digital video signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a fixed search time is used for all video signals, then the search process is simple, but devices with fast signal output experience premature termination and devices with slow signal output experience wasteful delays
Solution Approach 1:
The patent applies dynamics by making the search time variable rather than fixed. The controller dynamically adjusts the search time based on the detected connection status (power supply presence, authentication stages) of the external device. This allows the system to adapt the search duration to match the actual signal output characteristics of different devices, resolving the contradiction between simplicity and time efficiency.
Solution Approach 2:
The patent changes the parameter of search time from a constant value to a variable value that depends on connection status parameters. By monitoring parameters such as power supply detection and authentication progress, the system adjusts the search time parameter accordingly, enabling optimal performance across devices with varying signal output speeds without increasing overall system complexity.
2Reliability
If the search time is extended to accommodate slow signal output devices, then all devices can be properly detected, but devices with fast signal output experience unnecessary delays
Solution Approach 1:
The patent applies local quality by providing different search time durations tailored to specific device connection scenarios. Instead of using a uniform search time for all devices, the system locally adapts the search time based on the detected connection status of each external device. This ensures that fast devices receive appropriate short search times while slow devices receive extended search times, optimizing detection accuracy and response time for each case.
Solution Approach 2:
The system dynamically determines the appropriate search time based on real-time detection of connection status. By monitoring whether power is supplied, whether authentication is in progress, and other connection parameters, the controller dynamically selects the optimal search time duration, ensuring reliable detection without unnecessary delays for any device type.
3Loss of time
If the search time is shortened for fast signal output devices, then time efficiency is improved, but devices with slow signal output may not be properly detected
Solution Approach 1:
The patent changes the search time parameter based on detected connection status parameters. By monitoring external parameters such as power supply presence and authentication stage, the system adjusts the search time parameter to match the actual signal output characteristics of the connected device, ensuring both time efficiency and detection reliability.
Solution Approach 2:
The system performs preliminary detection of connection status (power supply, authentication progress) before finalizing the search time determination. This preliminary action allows the system to anticipate whether a shorter or longer search time is needed, ensuring that the optimal search time is selected in advance for each device type.
Data Source
AI summary
There is provided a display apparatus which includes an input device having a plurality of video signal terminals including a digital video signal terminal, a display configured to display an input signal which is input from the input device, and a controller configured to set a search time of a digital video signal in accordance with presence or absence of power supply to a power supply terminal of the digital video signal terminal, and a connection status in a case in which the power supply is present, and configured to execute a search of the digital video signal in the search time.