Dispersive Element Lithography for Sub-Micron Patterning
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Solution Overview
Problem
Conventional lithography methods for large area substrates in flat panel display manufacturing are unable to achieve sub-micron patterning with high throughput and efficiency at a low cost, limiting the production of features with critical dimensions required for advanced display devices.
Innovation Solution
The method involves projecting incident beams onto a mask with a dispersive element that diffracts the beams into order mode beams with a highest order greater than 1, creating an intensity pattern with sub-periodic patterns that write multiple portions in the photoresist layer, exceeding the number of diffraction orders, thereby enabling increased patterning density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lithography methods are used for large area substrates, then manufacturing process is simple, but sub-micron patterning capability and throughput are insufficient
Solution Approach 1:
The patent segments the diffraction pattern into multiple intensity peaks within a single period of the dispersive element. Each intensity peak acts as an independent exposure source, allowing multiple features to be written simultaneously across large area substrates, thereby improving both patterning precision and throughput
Solution Approach 2:
The patent utilizes the propagation direction (depth dimension) to create sub-periodic patterns through diffraction. By controlling the diffraction order N and utilizing the intensity distribution along the propagation path, multiple intensity peaks are generated in the third dimension, enabling high-density patterning without increasing mask complexity
2Productivity
If conventional lithography is used, then equipment cost is low, but throughput and efficiency for sub-micron patterning are poor
Solution Approach 1:
The patent makes the dispersive element serve multiple functions: it diffracts incident beams into higher order modes, generates sub-periodic patterns, and creates multiple intensity peaks all within a single component. This multi-functionality increases throughput without proportionally increasing system complexity
Solution Approach 2:
The patent changes the diffraction order parameter N to be greater than 1, which fundamentally alters the intensity pattern generation mechanism. This parameter change enables the system to produce multiple intensity peaks per mask period, significantly increasing patterning density and throughput while using standard lithography equipment
3Productivity
If higher diffraction orders are used, then number of portions written increases, but system complexity increases
Solution Approach 1:
The patent segments the single mask period into multiple functional regions that correspond to different intensity peaks. Each segment contributes to writing a specific portion in the photoresist, allowing the system to write more than N portions using only N diffraction orders through clever spatial segmentation of the intensity pattern
Solution Approach 2:
The patent uses the diffraction process to create multiple copies of the intensity pattern at different spatial locations and orientations. The sub-periodic patterns act as optical copies that are simultaneously exposed onto the photoresist, increasing the number of portions written without requiring multiple physical masks
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 allows for large area sub-micron patterning with high throughput and efficiency at a lower cost, effectively addressing the limitations of conventional lithography by increasing the number of portions written into the photoresist layer, thus enabling the production of features with critical dimensions for advanced display devices.
Implementation Method 1
The at least one period of the dispersive element diffracts the incident beam into order mode beams having one or more diffraction orders
Implementation Method 2
The reflector reflects the order mode beams to a beam splitter that redirects the one or more diffraction orders
Data Source
AI summary
Embodiments described herein provide a method of large area lithography. One embodiment of the method includes projecting at least one incident beam to a mask in a propagation direction of the at least one incident beam. The mask having at least one period of a dispersive element that diffracts the incident beam into order mode beams having one or more diffraction orders with a highest order N greater than 1. The one or more diffraction orders provide an intensity pattern in a medium between the mask and a substrate having a photoresist layer disposed thereon. The intensity pattern includes a plurality of intensity peaks defined by sub-periodic patterns of the at least one period. The intensity peaks write a plurality of portions in the photoresist layer such that a number of the portions in the photoresist layer corresponding to the at least one period is greater than N.