Laser Crystallization System for Display Substrate Uniformity
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Solution Overview
Problem
The process of crystallizing amorphous semiconductor layers on large-sized mother substrates for display devices is challenging, limiting the formation of active layers with desired characteristics.
Innovation Solution
A laser crystallization system is employed, featuring a mother substrate with multiple display regions and a stage that moves in two directions, utilizing two laser irradiation units with adjustable beams to crystallize amorphous semiconductor layers simultaneously across the substrate, ensuring uniformity and efficiency in forming active layers for display apparatuses of varying sizes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single laser irradiation unit is used to crystallize amorphous semiconductor layers on large-sized mother substrates, then the process is simpler, but the crystallization uniformity and efficiency across the entire substrate deteriorate
Solution Approach 1:
The patent divides the laser irradiation system into multiple units (first laser irradiation unit and second laser irradiation unit) that can independently irradiate different regions of the large-sized mother substrate. This segmentation allows each laser unit to focus on specific display regions, ensuring uniform crystallization across the entire substrate while maintaining manageable system complexity through modular design
2Device complexity
If the laser beam width is fixed, then the laser irradiation unit is simpler, but the adaptability to different display region sizes deteriorates
Solution Approach 1:
The patent incorporates adjustable beam widths in the laser irradiation units, allowing the beam width to be dynamically changed according to the size of different display regions. This dynamic adjustment capability enables the same laser system to handle various display region sizes (e.g., different generations of substrates) without requiring multiple fixed systems, thereby improving versatility while maintaining reasonable device complexity
3Device complexity
If multiple display regions are crystallized sequentially, then the laser system is simpler, but the manufacturing productivity deteriorates
Solution Approach 1:
The patent merges multiple laser irradiation units into a single integrated system that can simultaneously irradiate multiple display regions on the mother substrate. By combining the crystallization functions of multiple regions into one coordinated process, the system achieves parallel processing that significantly improves manufacturing productivity while keeping the overall system complexity manageable through unified control
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 improves the characteristics of the active layer, facilitates easy formation, and allows for the manufacturing of display apparatuses of different sizes on an eighth-generation mother substrate with consistent and improved electrical characteristics.
Implementation Method 1
a first laser irradiation unit for irradiating a first laser beam... a second laser irradiation unit... irradiating a second laser beam... The amorphous semiconductor layers may be crystallized by moving the stage in the second direction
Implementation Method 2
forming amorphous semiconductor layers, performing a crystallization process on the amorphous semiconductor layers... The amorphous semiconductor layers may be crystallized by moving the stage in the second direction
Data Source
AI summary
A laser crystallization system is disclosed. In one embodiment, the laser crystallization system includes i) a mother substrate including first, second, and third display regions sequentially arranged in a first direction and ii) a stage for supporting the mother substrate and moving in the first direction and in a second direction. The system also includes i) a first laser irradiation unit for irradiating a first laser beam having a width greater than or identical to a width of a side of one of the display regions in the first direction and ii) a second laser irradiation unit spaced apart from the first laser irradiation unit and irradiating a second laser beam having a width greater than or identical to the width of the side in the first direction. Furthermore, the first and second laser beams may correspond to widths of sides of the first and third display regions.