Spectrally-Adjusted Sampling Clock for High-Resolution Display Signal Accuracy
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Solution Overview
Problem
Existing analog interfaces face challenges in accurately converting analog display signals to digital signals due to instability in the sample clock, particularly in high-resolution displays, leading to errors in sampling and reduced display quality.
Innovation Solution
The solution involves spectrally adjusting and altering the sample clock's frequency and phase using a transform generator and analyzer to enhance the accuracy of digital display signals, employing a phase-locked loop and delay-locked loop to synchronize the sample clock with the synchronization signals, thereby reducing error frequencies and optimizing image spectral components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high-resolution digital displays are used, then display quality is improved, but sampling accuracy deteriorates due to reduced pixel time
Solution Approach 1:
The patent adjusts the sample clock frequency to match the pixel rate of the display, and modifies the phase relationship between the sample clock and synchronization signals. By changing these temporal parameters, the system achieves accurate sampling even at high resolutions where pixel time is reduced to 8-9 nanoseconds.
Solution Approach 2:
The system uses a transform analyzer to monitor spectral components of the displayed image and provides feedback to adjust the sample clock frequency and phase. This closed-loop approach ensures that sampling accuracy is maintained by detecting and correcting errors in real-time based on the actual display output.
2Measurement precision
If sample clock stability is increased, then sampling accuracy is improved, but device complexity increases
Solution Approach 1:
The patent introduces a phase-locked loop and delay-locked loop as intermediary circuits between the synchronization signals and the sample clock generator. These intermediary devices automatically adjust the sample clock's frequency and phase without requiring complex external control mechanisms, thereby maintaining sampling accuracy while limiting the increase in overall system complexity.
Solution Approach 2:
The sample clock circuit is designed to self-adjust its frequency and phase based on the synchronization signals it receives. The phase-locked loop automatically locks the sample clock to the correct frequency and phase relationship, eliminating the need for manual calibration or complex external control systems.
3Productivity
If pixel time is reduced for higher resolution, then display resolution is improved, but the time window for accurate sampling is reduced
Solution Approach 1:
The system performs preliminary adjustment of the sample clock frequency and phase before actual sampling begins. By pre-synchronizing the sample clock to the pixel rate and establishing the correct phase relationship in advance, the system ensures that sampling occurs at the optimal moment within each pixel time window, even when that window is as short as 8-9 nanoseconds.
Solution Approach 2:
The sample clock system is made dynamic through the use of phase-locked loops and delay-locked loops that can automatically adjust frequency and phase in real-time. This dynamic adaptation allows the system to maintain accurate sampling timing despite the reduced and varying pixel time intervals in high-resolution displays.
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 significantly improves the accuracy of digital display signals by minimizing error frequencies and maximizing image spectral component amplitudes, resulting in enhanced display quality on digital displays.
Implementation Method 1
employing a phase-locked loop and delay-locked loop to synchronize the sample clock with the synchronization signals
Implementation Method 2
employing a phase-locked loop and delay-locked loop to synchronize the sample clock with the synchronization signals
Implementation Method 3
spectrally adjusting and altering the sample clock's frequency and phase using a transform generator and analyzer
Data Source
AI summary
Methods and structures are provided for generating a digital display signal in response to an analog display signal whose amplitude varies at a pixel rate and in response to a synchronization signal that defines spatial order for the analog display signal. The structures include a transform generator for providing a Fourier transform of the digital display signal and a transform analyzer which generates frequency and phase control signals in respective response to the frequency of an error spectral component and amplitudes of image spectral components in the transform. The frequency and control signals are applied to respectively adjust the sample rate of the sample clock and alter the phase of the sample clock.