Display Mode Determination Using Adaptive Sampling for Analog Video Signals
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Solution Overview
Problem
Conventional display apparatuses fail to recognize and display images accurately when the horizontal and vertical synchronization signal frequencies are the same but resolutions differ, leading to incorrect display modes being applied to inputted video signals.
Innovation Solution
A method and device that determine the most suitable display mode by converting analog signals to digital using sampling signals corresponding to detected horizontal and vertical frequencies, and selecting the mode with the most suitable signal properties, such as minimal differences between adjacent sampling values or counts within predetermined ranges, to ensure accurate image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display apparatus uses conventional display mode determination based on H/V synchronization signal frequency, then the device complexity is reduced, but the measurement precision of display mode recognition fails when resolutions differ with same frequency
Solution Approach 1:
The patent segments the display mode determination process into multiple independent detection stages: first detecting H/V synchronization signal frequencies, then detecting signal properties (such as rise/fall times or edge counts) of the analog video signal, and finally matching these detected properties against stored reference values for different display modes. This segmentation allows accurate resolution identification without requiring a single complex determination mechanism.
Solution Approach 2:
The patent performs preliminary detection of display mode candidates based on H/V frequency alone, then performs additional preliminary property detection on the analog signal before final mode determination. By pre-identifying potential modes and pre-analyzing signal characteristics, the system avoids the need for complex real-time analysis of all possible display modes simultaneously.
2Adaptability or versatility
If the display apparatus supports multiple display modes with different resolutions, then the adaptability increases, but the ease of operation deteriorates when automatic mode selection fails
Solution Approach 1:
The patent implements a feedback mechanism where the detected signal properties (rise times, fall times, edge counts) are fed back to the mode selection logic, which then adjusts the display mode accordingly. This closed-loop feedback ensures that even when display modes have identical H/V frequencies, the system can reliably distinguish between them by analyzing the feedback information from signal property detection.
Solution Approach 2:
The display apparatus performs self-service by automatically detecting its own operating parameters (H/V frequencies and signal properties) and autonomously selecting the appropriate display mode without user intervention. The system serves itself by using its own detected signal characteristics to make mode determination, eliminating the need for manual configuration or external assistance.
3Manufacturing precision
If the display apparatus converts analog signal to digital using fixed sampling frequency, then the manufacturing precision is improved, but the adaptability worsens when input signal frequency varies
Solution Approach 1:
The patent applies dynamics by making the sampling frequency adaptive rather than fixed. The sampling frequency is dynamically adjusted based on the detected H/V synchronization signal frequencies and signal properties. This allows the analog-to-digital conversion to maintain high precision across different display modes and signal frequencies, resolving the contradiction between fixed precision and variable adaptability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for precise determination and display of the correct display mode related to the inputted signal source, enhancing image accuracy and compatibility across various resolutions and timing modes.
Implementation Method 1
converting the inputted analog signal to a digital signal according to a sampling signal corresponding to each of the at least one determined display mode
Data Source
AI summary
The present invention relates to an apparatus and a method of determining a display mode from a plurality of display modes for a display device that displays an image, each display mode relates to an inputted signal from a signal source that includes an analog signal and an H/V synchronization signal, the method including determining at least one display mode corresponding to the inputted H/V synchronization signal; converting the inputted analog signal to a digital signal according to a sampling signal corresponding to each of the at least one determined display mode; and displaying the image using a display mode from the at least one determined display mode that most closely relates to the signal source.