Dynamic Imaging System for Substrate Warpage Compensation
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Solution Overview
Problem
Photolithography systems face challenges in producing high-quality display panels and semiconductor devices due to substrate warpage and die-shift, which result in pattern defects and lower quality products.
Innovation Solution
A dynamic imaging system that includes a moveable stage, encoders, and an inspection system integrated with digital lithography, capable of providing 3D profile and die-shift measurements to compensate for substrate warpage and die-shift by modifying exposure pattern data, ensuring accurate positioning and exposure of photoresists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a warped substrate is used to carry a plurality of chip-die, then the substrate can be manufactured and handled, but the local x-shift and y-shift (die-shift) occurs causing pattern distortion and disconnection
Solution Approach 1:
The system performs preliminary measurement of substrate warpage and die-shift using inspection systems before the lithography exposure process. This advance detection allows the control system to pre-calculate compensation values and adjust the exposure pattern data accordingly, ensuring accurate pattern positioning despite substrate distortion.
Solution Approach 2:
The system implements a feedback loop where inspection systems continuously monitor substrate position and warpage, and the control system uses this information to dynamically adjust exposure patterns. The measured die-shift and warpage data feed back into the pattern generation process to compensate for distortions in real-time.
2Adaptability or versatility
If substrate warpage is present, then the substrate can accommodate thermal and mechanical variations, but the resultant location of photoresist exposure shifts causing pattern defects
Solution Approach 1:
The system transitions from a static exposure approach to a dynamic one by continuously measuring substrate warpage and die-shift during the manufacturing process. The exposure patterns are dynamically adjusted based on real-time measurements, allowing the system to adapt to substrate variations while maintaining precision.
Solution Approach 2:
The system changes the parameters of the exposure pattern data based on measured substrate conditions. By adjusting coordinates, magnification, and other exposure parameters according to detected warpage and die-shift, the system compensates for substrate variations and maintains accurate pattern positioning.
3Device complexity
If traditional lithography systems are used without compensation, then the system structure remains simple, but pattern defects occur due to die-shift and warpage
Solution Approach 1:
The system merges the inspection functions (warpage measurement and die-shift detection) with the lithography exposure system into an integrated platform. This combination allows seamless data flow from measurement to compensation, improving pattern quality while avoiding the need for entirely separate systems.
Solution Approach 2:
The control system acts as an intermediary between the inspection systems and the lithography exposure system. It receives measurement data, calculates compensation values, and generates corrected exposure patterns, serving as a mediator that translates raw measurement data into actionable exposure adjustments.
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 effectively compensates for substrate distortions, enabling the creation of accurate exposure patterns and improving the quality of display panels and semiconductor devices by maintaining proper positioning and etching of film layers, thus reducing defects and enhancing production efficiency.
Implementation Method 1
The first encoder is configured to provide a position of the first substrate to an interface
Implementation Method 2
The inspection system is configured to provide three-dimensional (3D) profile measurements and die-shift measurements of the first substrate
Implementation Method 3
The digital lithography system is configured to receive the compensated pattern data from the interface and expose the photoresist with a compensated pattern
Data Source
AI summary
Embodiments described provide dynamic imaging systems that compensates for pattern defects resulting from distortion caused by warpage of the substrate. The methods and apparatus described are useful to create compensated exposure patterns. The dynamic imaging system includes an inspection system configured to provide 3D profile measurements and die shift measurements of the first substrate to the interface configured to provide compensated pattern data to the digital lithography system configured to receive the compensated pattern data from the interface and expose the photoresist with a compensated pattern.