Digital Lithography Scan Sequencing for Substrate Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Digital lithography systems face challenges in addressing variations in manufacturing conditions that introduce errors in substrate surface profiles, leading to misalignment of connection paths and functional defects.
Innovation Solution
The system incorporates a digital lithography system that allows for parallel or sequential metrological scanning and lithographic exposure using methods like TTL, FIFO, or SA, and combines metrological scanning and lithographic exposure units into a single processing unit to minimize offset errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional photomask-based lithography is used, then manufacturing process is simpler, but processing speed and resolution are lower
Solution Approach 1:
The patent replaces the mechanical photomask system with a digital optical projection system. Instead of physically moving and aligning photomasks, the system uses digital patterns projected through optical systems to define exposure areas, enabling faster reconfiguration and higher resolution without mechanical constraints
Solution Approach 2:
The patent implements dynamic control of exposure parameters including variable exposure areas, adjustable exposure amounts, and real-time pattern modification. The system can dynamically adapt exposure conditions based on substrate variations and manufacturing requirements, enabling both high speed and precision
2Manufacturing precision
If substrate surface profile variations are not corrected, then processing is faster, but alignment precision deteriorates
Solution Approach 1:
The patent performs preliminary metrological scanning of the substrate surface profile before lithographic exposure. This advance measurement allows the system to pre-calculate compensation parameters and adjust exposure patterns in advance, ensuring precise alignment without adding complex real-time correction mechanisms
Solution Approach 2:
The patent implements a feedback loop where metrological scanning data from the substrate surface is used to generate compensation parameters that are applied to the lithographic exposure process. This closed-loop control system automatically corrects for surface variations, maintaining high precision without manual intervention
3Loss of time
If metrological scanning and lithographic exposure are performed sequentially on separate units, then device complexity is reduced, but processing time increases and offset errors are introduced
Solution Approach 1:
The patent combines metrological scanning and lithographic exposure units into an integrated system where both functions operate on the same substrate within the same coordinate framework. This merging eliminates the need for substrate repositioning between operations, removing offset errors and reducing total processing time
Solution Approach 2:
The patent enables continuous processing by performing metrological scanning and lithographic exposure in a continuous sequence without interrupting substrate positioning. The system maintains continuous operation through coordinated control of both units, maximizing throughput while ensuring precision
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 reduces processing time, increases throughput, minimizes errors introduced by substrate manipulation, and ensures accurate creation of connections on altered substrate surface profiles.
Implementation Method 1
an optical system configured to transmit optical signals both to and from the substrate and the first lithographic processing unit
Implementation Method 2
a lithographic exposure unit configured to perform digital lithographic exposure of the substrate via the optical system
Data Source
AI summary
A digital lithography system includes a stage configured to support a substrate, a bridge disposed above the stage, and a first lithographic processing unit coupled to the bridge. The first lithographic processing unit coupled to the bridge can include a scanning unit, a lithographic exposure unit, and an optical system shared by the scanning unit and the lithographic exposure unit. The scanning unit is to use the optical system to generate measurements of the substrate during a measurement operation, and the lithographic exposure unit is to use the optical system to perform digital lithographic exposure of the substrate using the optical system during an exposure operation.