Video Clock Synchronization for Stable Panel Frame Timing
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Solution Overview
Problem
Conventional digital display devices face issues with generating an output clock that conforms to the timing constraints of different panels, leading to instability in image frame formats due to jitter or drift in video clocks, resulting in inaccurate processing of image frames.
Innovation Solution
A method is introduced to generate an output clock that adjusts its frequency based on a vertical synchronization signal to match a target frame format, ensuring the total number of pixels in each frame aligns with the panel's timing requirements, using a digital phase-locked loop to stabilize the output clock and maintain frame synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the display controller uses a conventional output clock without frequency adjustment, then the circuit design is simple, but the output frame format becomes unstable due to jitter or drift in video clocks, causing the amount of total pixels to vary and fail to meet panel timing constraints
Solution Approach 1:
The patent implements a feedback mechanism where the output clock frequency is continuously adjusted based on the detected frame format and timing constraints. The display controller monitors the actual output frame parameters and dynamically modifies the clock frequency to maintain the target frame format, ensuring stability despite input clock variations.
Solution Approach 2:
The patent transforms the static clock generation approach into a dynamic system where the output clock frequency can be adjusted in real-time. By making the clock frequency adaptive rather than fixed, the system can respond to timing constraint requirements and maintain stable frame formats across different panel types and operating conditions.
2Manufacturing precision
If the display controller adjusts the output clock frequency to conform to panel timing constraints, then the frame format stability improves, but the circuit complexity increases due to additional control mechanisms
Solution Approach 1:
The patent changes the operating parameters of the clock generation circuit by dynamically adjusting the output clock frequency. Instead of using a fixed-frequency clock, the system modifies the clock parameter (frequency) to match the timing constraints of different panels, thereby achieving precise frame format conformity.
Solution Approach 2:
The patent creates a universal clock generation mechanism that can adapt to multiple different panel types and timing constraints. The same display controller circuit can serve various panels with different requirements by adjusting its output clock parameters, eliminating the need for separate dedicated circuits for each panel type.
3Adaptability or versatility
If the amount of total pixels in the image frame is not fixed, then the display controller can handle variable input data, but the panel cannot process the frames accurately due to timing constraint violations
Solution Approach 1:
The system uses feedback to monitor the actual frame parameters being output and adjusts the clock frequency accordingly to ensure the total pixel count meets panel requirements. This closed-loop control maintains reliability by continuously verifying and correcting the frame format to match panel timing constraints.
Solution Approach 2:
The display controller performs preliminary adjustment of the output clock frequency before frames are sent to the panel. By pre-configuring the clock to produce the correct frame format, the system ensures that panels receive properly formatted data without requiring post-processing or correction, thereby maintaining processing accuracy.
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 stabilizes the output frame format, ensuring it conforms to the target frame format and meets the timing constraints of various panels, thereby improving the accuracy and consistency of image frame processing.
Implementation Method 1
using a digital phase-locked loop to stabilize the output clock and maintain frame synchronization
Data Source
AI summary
A method for generating a video clock and an associated target image frame is disclosed. The method generates an output clock signal for outputting a target image frame to a panel according to a frame pixel number and a vertical synchronization signal (Vsync). The target image frame corresponds to a source image frame. The frame pixel number is the number of total pixels included in a predetermined frame format, and the Vsync signal is an input Vsync signal or an output Vsync signal. The period of the output clock signal is the result of the period of the Vsync divided by the frame pixel number. In this manner, the format of the target image frame can remain substantially fixed, and is substantially equal to the predetermined frame format.