High Resolution Photolithography with DMD Autofocus
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Solution Overview
Problem
Current photolithography technologies face challenges in achieving high resolution and uniformity over large areas, particularly in adjusting focal planes and ensuring illumination consistency across substrates, which limits the precision and fidelity of patterning.
Innovation Solution
A high resolution photolithography system incorporating a Digital Micromirror Device (DMD) with a control system that calibrates illumination intensity, supports autofocusing, and adjusts the focal plane using spatial-frequency amplitude analysis, along with a fluidics system for precise environmental control and fluid injection, enabling high-fidelity printing on various substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional photolithography systems are used, then basic patterning can be achieved, but high resolution and uniformity over large areas cannot be achieved due to focal plane adjustment limitations and illumination inconsistency
Solution Approach 1:
The system divides the substrate into multiple regions and processes them sequentially with a digital light projector that can selectively illuminate different areas. The stage moves the substrate through different positions under the projection system, enabling large-area processing while maintaining focus and illumination uniformity across each region.
Solution Approach 2:
The system implements dynamic focal plane adjustment through Z-axis stage movement and tip-tilt mirror adjustments that adapt to the specific topography and position of the substrate. This dynamic adaptation allows the system to maintain optimal focus across varying substrate surfaces and large processing areas.
2Illumination intensity
If focal plane adjustment is limited, then system simplicity is maintained, but illumination uniformity and imaging quality deteriorate over large substrate areas
Solution Approach 1:
The system incorporates feedback mechanisms through camera-based imaging and control systems that monitor illumination uniformity and focal quality in real-time. The control system automatically adjusts Z-position and tip-tilt parameters based on captured images and predefined criteria, eliminating the need for manual focal adjustment while maintaining optimal illumination uniformity.
Solution Approach 2:
The system performs self-adjustment of focal plane and illumination parameters through automated control algorithms that analyze captured images and modify projection parameters accordingly. The digital light projector and positioning system work together to automatically optimize imaging conditions without external intervention.
3Productivity
If manual alignment and focusing procedures are used, then system complexity is reduced, but time consumption and operational difficulty increase for achieving precise patterning
Solution Approach 1:
The system performs preliminary alignment and focusing actions by capturing images of the substrate and calculating optimal positioning parameters before actual patterning begins. Fiducial markers and predefined patterns are used to pre-determine stage positions and projection parameters, enabling rapid subsequent processing without repeated manual adjustments.
Solution Approach 2:
The system replaces manual mechanical alignment and focusing operations with automated digital control. Camera-based imaging and software algorithms substitute for manual visual inspection and mechanical adjustment, enabling precise and rapid positioning and focusing through electronic control of the stage and projection system.
4Manufacturing precision
If environmental conditions are not controlled, then system simplicity is maintained, but patterning fidelity and resolution deteriorate due to temperature and humidity variations
Solution Approach 1:
The system creates a controlled environment chamber that isolates the substrate and projection optics from external environmental variations. Temperature and humidity are regulated within the enclosed chamber, providing a stable atmosphere that prevents distortion and maintains patterning fidelity without requiring complex external environmental control infrastructure.
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
The system achieves high illumination uniformity within ±5% over 95% of the illumination area, allows for precise autofocusing and tip-tilt adjustments, and enables high-fidelity printing of microarrays and other complex patterns with improved resolution and consistency across large areas.
Implementation Method 1
at least one digital light projector (DLP) comprising a Digital Micromirror Device (DMD) chipset comprising a plurality of micromirrors
Implementation Method 2
govern adjustment of a focal plane of the DLP based on the spatial-frequency amplitude of the captured image. Configuration to govern adjustment of the focal plane may include configuration to govern at least one of adjusting a Z-position of the light projection system relative to the mounting stage
Implementation Method 3
capturing an image of the pattern on the substrate having projection thereon, and decomposing the captured image of the pattern into spatial-frequency amplitude
Implementation Method 4
Conducting tilt-tilt adjustment may include governing the positioning system for tip-tilt including rotation of the mounting stage about at least one of X, Y, and Z axes
Data Source
AI summary
Devices, systems, and method for high resolution photolithography can include a mounting stage for receiving a substrate in position to receive projected light for photolithography, a light processing system for projecting light onto the mounting stage for photolithography on the substrate, and a positioning system for adjusting relative positioning between the light processing system and the mounting stage. A control system for conducting operations for high resolution photolithography, can be configured to determine relative positioning between the light processing system and the mounting stage and for governing operation of the positioning system for adjusting relative positioning.