Laser-Formed Valleys in Multi-Domain LCD Substrates
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Solution Overview
Problem
The existing multi-domain LCD devices face challenges in manufacturing due to the need for additional masks and complex photo processes, leading to increased costs and reduced yield, as well as difficulties in maintaining uniformity in valley width and depth during the formation of valleys for vertical alignment modes.
Innovation Solution
A multi-domain LCD device is developed using a laser-irradiated groove on the second substrate to form valleys, eliminating the need for additional masks and allowing for precise control of groove width and depth through energy intensity and incident angle adjustments, thereby simplifying the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional masks and complex photo processes are used to form valleys in existing multi-domain LCD devices, then the valleys can be formed with defined geometry, but the manufacturing complexity and cost increase and yield decreases
Solution Approach 1:
The patent replaces the mechanical photo process system (masks, photoresist coating, exposure, development) with a direct laser beam writing system. The laser beam directly ablates or modifies the substrate to form valleys, eliminating the need for physical masks and photochemical processes, thereby reducing manufacturing complexity while maintaining geometric precision
Solution Approach 2:
The patent extracts and removes the mask and photo process steps from the manufacturing sequence. By using direct laser writing, the valley formation process stands alone without requiring the supporting infrastructure of photolithography masks and chemical development processes, simplifying the overall manufacturing flow
2Manufacturing precision
If additional masks and photo processes are used to form valleys, then valley geometry can be controlled, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive photolithography mask systems with a programmable laser writing system. The laser parameters (power, speed, pattern) can be digitally controlled to achieve consistent valley geometry without the recurring costs of mask fabrication and handling, reducing manufacturing cost while maintaining precision
Solution Approach 2:
The patent controls valley width and depth by adjusting laser beam parameters such as power intensity, scanning speed, and pulse duration. This digital parameter control replaces physical mask dimensional constraints, allowing precise geometric control without the material and fabrication costs associated with photolithography masks
3Manufacturing precision
If additional masks and photo processes are used to form valleys, then valley formation is achieved, but manufacturing yield decreases
Solution Approach 1:
By removing the mask and photo process steps, the patent eliminates the failure modes associated with mask alignment, photoresist application defects, and development inconsistencies. The direct laser writing process reduces the number of process steps where yield can be lost, improving overall manufacturing yield while maintaining valley formation accuracy
Solution Approach 2:
The replacement of mechanical photo processes with direct laser writing eliminates sources of variation and defect generation inherent in photolithography, such as mask alignment errors and photoresist contamination. This substitution improves process robustness and manufacturing yield while preserving the ability to form valleys with precise geometry
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 enables the formation of uniform and precise valleys, improving the alignment of liquid crystals and enhancing the viewing angle quality while reducing manufacturing complexity and costs.
Implementation Method 1
a laser-irradiated groove having a predetermined width and depth in the surface of the second substrate
Implementation Method 2
forming a groove by applying a laser beam to a predetermined portion of a second substrate
Data Source
AI summary
A multi-domain liquid crystal display (LCD) device including first and second substrates facing each other, gate and data lines crossing each other on the first substrate to thereby form a pixel region, a pixel electrode formed in the pixel region of the first substrate, a laser-irradiated groove having a predetermined width and depth in the surface of the second substrate, a common electrode formed in the second substrate having a predetermined step coverage generated by the surface of the second substrate and the groove, and a liquid crystal layer formed between the first and second substrates.