Image Timing Reconstruction from Blanking Signals for Variable Refresh
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Solution Overview
Problem
Conventional image conversion apparatuses struggle to establish correct timing when equipment operates in a variable refresh rate mode, especially when the transmission terminal does not provide corresponding timing information, leading to incorrect image processing.
Innovation Solution
An image conversion apparatus and method that utilize a receiving circuit, horizontal and vertical synchronization reconstruction circuits, and a transmission circuit to generate and integrate horizontal and vertical synchronization signals based on blanking signals, enabling correct timing reconstruction for output display data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmission terminal does not provide timing information in variable refresh rate mode, then the image conversion apparatus cannot establish correct timing, but adding timing reconstruction mechanisms increases device complexity
Solution Approach 1:
The patent applies preliminary action by detecting horizontal blanking signals and generating horizontal synchronization signals in advance before vertical synchronization is needed. The horizontal synchronization reconstruction circuit continuously monitors blanking signals and prepares timing references, so when vertical synchronization reconstruction is required, the system already has established timing patterns to work from, enabling reliable timing establishment without complex real-time analysis circuits.
Solution Approach 2:
The patent uses horizontal synchronization signals as an intermediary between the absent timing information from the transmission terminal and the required vertical synchronization timing. The vertical synchronization reconstruction circuit selects timing based on comparing vertical blanking signal timings with pre-established horizontal synchronization signal timings, using the horizontal signals as a mediator to derive correct vertical timing without directly receiving timing information from the terminal.
2Device complexity
If conventional image conversion apparatus is used without timing reconstruction, then device complexity is low, but image conversion reliability fails under variable refresh rate mode
Solution Approach 1:
The patent implements self-service by enabling the image conversion apparatus to autonomously reconstruct its own timing signals from the input signal characteristics. The system detects horizontal and vertical blanking signals within the incoming video stream and independently generates corresponding synchronization signals without requiring external timing information from the transmission terminal or receiving terminal, making the apparatus self-sufficient in establishing correct timing for variable refresh rate operations.
3Speed
If timing information is not reconstructed, then processing speed is fast, but image processing accuracy deteriorates under variable refresh rates
Solution Approach 1:
The patent applies periodic action by utilizing the periodic nature of horizontal and vertical blanking signals that occur at regular intervals within each video frame. The reconstruction circuits are designed to detect these periodic blanking transitions and generate corresponding periodic synchronization signals. This approach maintains processing speed by using simple edge-detection logic triggered by periodic signal events, while ensuring accuracy because the periodic timing naturally aligns with the variable refresh rate content changes.
Data Source
AI summary
The present disclosure discloses an image conversion apparatus having timing reconstruction mechanism. A receiving circuit receives a first interface image signal having input display data and horizontal blanking signals. A horizontal synchronization reconstruction circuit generates horizontal synchronization signals according to timings of the horizontal blanking signals. A vertical synchronization reconstruction circuit selects a predetermined timing of a predetermined signal between a frame initial timing and a display initial timing of the input display data, determines a timing of one of the horizontal synchronization signals behind and closest to the predetermined timing and generates a vertical synchronization signal accordingly. An image reconstruction circuit generates output display data according to the input display data and the horizontal synchronization signals. A transmission circuit integrates the horizontal synchronization signals and the vertical synchronization signal with the output display data being included in a second interface image signal to be outputted through a second interface.