LCD Sub-Pixel Addressing for High-Resolution Vat Polymerization
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Solution Overview
Problem
Current Vat Polymerization processes for 3D printing, particularly those using LCD panels, face challenges in achieving high resolution and accuracy due to limitations in pixel size and uniformity, leading to inferior results compared to DLP projectors, and lack cost-effective solutions for enhancing resolution and edge smoothing.
Innovation Solution
A novel method utilizing a liquid crystal display (LCD) photomask module with a pixel matrix of addressable sub-pixels to generate sub-pixel patterns, allowing for flood-filling of colors to distinguish between inner and outer contour regions, thereby enhancing resolution and accuracy through sub-pixel addressing and the Polygon Algorithm for contour determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If DLP projectors are used for blanket exposure, then throughput and speed are improved, but device cost and complexity increase significantly
Solution Approach 1:
The patent replaces expensive DLP projectors with affordable LCD panels that can be easily replaced. The LCD panel serves as a disposable or easily replaceable component that projects the photomask pattern, eliminating the need for costly DLP projector hardware while maintaining the blanket exposure capability for high throughput.
Solution Approach 2:
The patent uses LCD panels to create optical copies of the photomask pattern. The liquid crystal display acts as a programmable mask that can be updated digitally, allowing the same pattern to be reproduced repeatedly without physical mask changes, thus achieving high throughput with low-cost equipment.
2Device complexity
If LCD panels are used for photomask projection, then device cost is reduced, but manufacturing precision and resolution deteriorate due to pixel size limitations
Solution Approach 1:
The patent segments each pixel into multiple sub-pixels (typically red, green, and blue sub-pixels) that can be independently controlled. By addressing individual sub-pixels rather than entire pixels, the effective resolution is increased by a factor of 3 or more, allowing high manufacturing precision to be achieved with standard LCD panel hardware.
Solution Approach 2:
The patent applies different properties to different parts of the pixel structure by independently controlling sub-pixels. Each sub-pixel can be selectively activated or deactivated based on the required pattern, allowing precise local control of light transmission at the sub-pixel level, thereby achieving high resolution despite the physical pixel size limitations.
3Device complexity
If standard pixel addressing is used in LCD panels, then device simplicity is maintained, but manufacturing precision deteriorates due to pixel size and divergence effects
Solution Approach 1:
The patent divides each pixel into addressable sub-pixels and uses sophisticated software algorithms to control them individually. This segmentation approach, combined with flood-fill algorithms and edge detection, enables precise pattern formation at the sub-pixel level while maintaining the physical simplicity of using standard LCD panels without requiring complex hardware modifications.
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 method achieves smoother edges and higher resolution cross-sectional patterns, improving the accuracy and efficiency of the Vat Polymerization process while being cost-effective, surpassing traditional methods by enabling triple resolution enhancement and edge smoothing.
Implementation Method 1
Vat Polymerization is a method in 3D printing to print 3D objects using photo-polymerization. Technically, Vat Polymerization produces an array using additive manufacturing (AM) processes for which a liquid resin contained in a vat is selectively solidified via light-activated polymerization (also called light-cured polymerization).
Data Source
AI summary
A method of photo-curing a photo-sensitive resin is disclosed in the present invention. The method includes the following steps: generating a sub-pixel pattern having an outer contour region and an inner contour region based on a vector file taken from a cross-section of a model; providing the sub-pixel pattern to a photomask module, wherein the photomask module includes a panel having a pixel matrix including plural square pixels, each of which includes three color-filtered sub-pixels; flood-filling color in each of the color-filtered sub-pixels to distinguish the outer contour region from the inner contour region; and exposing the photo-sensitive resin to a light source emitting a light passing through the panel.