LCD Printing Screen Light Uniformity Calibration by Image Feedback
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Solution Overview
Problem
Existing 3D printers using liquid crystal display (LCD) photocuring face issues with uneven light intensity due to variations in lamp bead luminous power, aging, manufacturing errors, and installation accuracy, leading to inconsistent light exposure and reduced detail and accuracy in fine models.
Innovation Solution
A light uniformity adjustment method involving capturing images, calculating weighted variance values, and determining initial current and light intensity to achieve uniformity, using a capturing apparatus to iteratively adjust and calibrate light intensity based on pixel grayscale weighted variance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If matrix ultraviolet light sources with extended optical length, modified lamp bead layout or lens structure, and COB light source combined with Fresnel lens are used, then the uniformity of initial light intensity on the LCD printing screen is improved, but the light intensity values of different regions of the entire frame remain inconsistent due to variations in lamp bead luminous power, aging, manufacturing error and installation accuracy
Solution Approach 1:
The patent changes the parameters of the optical system by adjusting the optical length, modifying lamp bead layout, and combining COB light source with Fresnel lens to improve initial light intensity uniformity. This addresses the contradiction by optimizing physical parameters to achieve better uniformity while accepting that some inconsistency remains due to manufacturing variations.
Solution Approach 2:
The patent implements a feedback mechanism by capturing images of the printing screen, calculating weighted variance values to assess light uniformity, and using this information to determine initial current settings. This closed-loop feedback allows the system to compensate for manufacturing errors and aging effects, achieving consistent light intensity across the frame despite variations in lamp bead performance.
2Manufacturing precision
If uniformity calibration on light intensity over the entire frame is performed, then the details and accuracy of fine models are guaranteed, but the complexity of the device and calibration process increases
Solution Approach 1:
The system performs self-calibration by automatically capturing images, calculating weighted variance values, and determining initial current settings without requiring manual intervention. The capturing apparatus and processing algorithm work together to autonomously achieve light uniformity calibration, ensuring fine model accuracy while minimizing the need for complex manual calibration procedures.
Solution Approach 2:
The patent replaces complex mechanical calibration adjustments with an automated optical-electrical system. Instead of manually adjusting optical components to achieve uniformity, the system uses image capture, digital calculation of weighted variance, and electrical current control to achieve the same result, simplifying the calibration process while maintaining high precision.
Data Source
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AI summary
The present invention relates to a light uniformity adjustment method and apparatus, a device, and a storage medium. The light uniformity adjustment method comprises: obtaining a first captured image, wherein the first captured image is obtained by an acquisition device photographing a first display image displayed on a printing screen; calculating a weighted variance value of the first captured image to obtain a first numerical value, and determining an initial current according to the first numerical value; obtaining a second captured image, wherein the second captured image is obtained by the acquisition device photographing, under the initial current, a second display image displayed on the printing screen; and calculating a weighted variance value of the second captured image to obtain a second numerical value, and determining initial light intensity of the printing screen according to the second numerical value. According to the method provided by the present application, uniformity calibration can be performed on the light intensity of a full-frame, thereby ensuring the details and precision of a fine model.