CIS Light Emitting Diode Timing Control for Color Registration
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Solution Overview
Problem
Current image scanning technologies face challenges in improving image quality due to color registration errors and light intensity inconsistencies, particularly when using contact image sensors (CIS) with light sources emitting Red, Green, and Blue wavelengths, which can result in color blurs and registration errors.
Innovation Solution
The image scanning apparatus controls the light emitting time of Red, Green, and Blue light emitting elements to be sequentially lit up at intervals shorter than the standard time by a predetermined value, and adjusts light intensity to increase irradiated light, thereby reducing color registration errors and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If light emitting elements are sequentially lit up at standard intervals, then color registration is maintained, but image quality deteriorates due to color blurs and registration errors
Solution Approach 1:
The patent applies periodic action by sequentially lighting up Red, Green, and Blue light emitting elements at specifically controlled intervals. The light emitting time is set to be shorter than the standard time (T/3) by a predetermined value, creating a periodic lighting pattern that prevents color blurs while maintaining registration accuracy. This periodic sequential lighting resolves the contradiction by establishing a reliable timing pattern.
Solution Approach 2:
The patent changes the light emitting time parameter from the standard T/3 to a shorter duration (T/3 - predetermined value). This parameter change optimizes the lighting duration to prevent color registration errors and improve image quality consistency, directly resolving the technical contradiction between registration accuracy and image quality.
2Manufacturing precision
If light emitting time is reduced to prevent color blurs, then color registration improves, but light intensity decreases
Solution Approach 1:
The patent simultaneously changes two parameters: light emitting time is reduced to T/3 - predetermined value, while light intensity is increased by a predetermined value. This dual parameter change resolves the contradiction by compensating for the reduced time through increased intensity, maintaining both color registration accuracy and sufficient light irradiation.
Solution Approach 2:
The patent applies different adjustments to different parameters locally: time is reduced to prevent color blurs, while intensity is increased to compensate for the shorter duration. This localized parameter optimization resolves the contradiction between registration precision and illumination intensity.
3Manufacturing precision
If light intensity is increased to compensate for shorter emitting time, then image quality improves, but energy consumption increases
Solution Approach 1:
The patent uses periodic sequential lighting with optimized timing to deliver sufficient light exposure in shorter bursts. By lighting elements sequentially at specific intervals rather than continuously, the system maintains image quality while reducing total energy consumption compared to continuous lighting approaches.
Solution Approach 2:
The patent applies partial action by lighting elements for shorter durations (T/3 - predetermined value) but with increased intensity. This partial lighting approach, combined with sequential operation, achieves sufficient image quality while consuming less total energy than full-duration continuous lighting.
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 effectively reduces color registration errors and improves the overall quality of scanned images by ensuring consistent light exposure and intensity, preventing issues like reddish or bluish color distortions and maintaining image clarity.
Implementation Method 1
a light source including at least three light emitting elements of red, green, and blue
Implementation Method 2
performs photoelectric transformation on reflected light of the irradiated light by using an image sensor
Data Source
AI summary
An image scanning apparatus and method. The image scanning apparatus which scans an image of document includes a light source including at least three light emitting elements of red, green, and blue, which are sequentially lit up at intervals of a first time, a light emitting time control unit to control a light emitting time of the at least three light emitting elements such that the first time is shorter than a second time by a predetermined value, a sensor array to transform an image formed by light reflected from the document into an electric signal according to results of the control of the light emitting time and the light intensity, and an output unit to output image data corresponding to the transformed electric signal.