Printing Element Substrate Phase Correction Circuit
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Solution Overview
Problem
Conventional printing apparatuses face challenges in synchronizing high-frequency clock and data signals due to phase differences, which are difficult to correct, especially when temperature or time changes occur, requiring a training period for stabilization.
Innovation Solution
A printing apparatus with a phase correction unit that includes first and second delay circuits to generate delayed signals, allowing for instantaneous phase correction without a training period, enabling the apparatus to follow phase changes caused by temperature or time variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a delay-locked loop (DLL) circuit or phase-locked loop (PLL) circuit is used to correct phase difference, then phase correction capability is provided, but a training period is required for stabilizing operation
Solution Approach 1:
The correction circuit segments the phase correction process by generating multiple delayed signals with different delay times (first delayed signals and second delayed signals) and selecting the appropriate delay amount based on comparison results, eliminating the need for a training period while maintaining reliable phase correction
Solution Approach 2:
The correction circuit performs preliminary phase correction by pre-generating multiple delayed signals with different delay times before actual phase mismatch occurs, allowing instantaneous correction without training period when phase difference needs to be corrected
2Reliability
If repeated reading and checking of image data signals is performed to determine phase correction amount, then phase correction can be achieved, but it takes a long time to determine the correction amount
Solution Approach 1:
The correction circuit pre-generates multiple delayed signals with different delay times before actual phase correction is needed, so when phase mismatch occurs, the correction amount can be determined immediately through comparison without repeated reading and checking, significantly improving correction speed while maintaining accuracy
Solution Approach 2:
The correction circuit creates copies of the input signals with different delay times (first delayed signals and second delayed signals) and uses these copies for comparison to determine the appropriate correction amount, eliminating the need for repeated reading and checking of original signals
3Reliability
If conventional phase correction methods are used, then initial phase difference can be corrected, but it is difficult to follow phase changes caused by temperature or time variations
Solution Approach 1:
The correction circuit continuously compares the first delayed signals with the second signal and the second delayed signals with the first signal to detect phase changes caused by temperature or time variations, and dynamically adjusts the correction amount through feedback to maintain synchronization
Solution Approach 2:
The correction circuit dynamically adjusts the phase correction amount by selecting different delayed signals based on real-time comparison results, enabling it to adapt to and track phase changes caused by temperature or time variations rather than using a fixed correction value
Data Source
AI summary
A printing element substrate comprises a correction circuit that corrects a phase difference between a first signal and a second signal, wherein the correction circuit includes a first delay circuit that generates a plurality of first delayed signals having different delay times with respect to the first signal, and a second delay circuit that generates a plurality of second delayed signals having different delay times with respect to the second signal, the correction circuit specifies a phase of the first signal to be output to the driving circuit, on the basis of comparison between the plurality of first delayed signals and the second signal, and the correction circuit specifies a phase of the second signal to be output to the driving circuit, on the basis of comparison between the plurality of second delayed signals and the first signal having the specified phase.