Vertical Substrate Etching for LCD Weight Reduction
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Solution Overview
Problem
Current methods for etching glass substrates in liquid crystal displays (LCDs) result in non-uniform etching, surface contamination, and increased costs due to excessive etchant use, while also limiting weight reduction of the LCD, as the glass substrates are typically etched in a horizontal position with uneven etchant application.
Innovation Solution
A substrate etching apparatus that positions the glass substrates vertically and sprays etchant uniformly onto both surfaces, using a cassette system with robots for automated handling and etching, allowing for precise control of etchant application and efficient etching of attached or separate glass substrates, thereby reducing weight and improving fabrication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If substrates are etched to reduce LCD weight, then weight reduction is achieved, but substrate strength decreases
Solution Approach 1:
The patent divides the substrate processing into separate steps: first etching one surface to reduce weight, then attaching a second substrate for reinforcement. This segmentation allows weight reduction while maintaining structural strength through the attached substrate configuration.
2Ease of manufacture
If traditional etching methods are used, then etching process is simple, but etching uniformity deteriorates
Solution Approach 1:
The patent introduces a vertical dimension to the etching process by positioning substrates vertically and spraying etchant from above. This dimensional change enables uniform etching of both surfaces simultaneously while maintaining process simplicity, resolving the contradiction between ease of manufacture and etching uniformity.
3Device complexity
If substrates are processed manually, then equipment complexity is low, but processing speed deteriorates
Solution Approach 1:
The patent implements an automated system where the substrate processing apparatus performs loading, vertical positioning, etching, and unloading operations autonomously. The cassette-based automated loading and unloading system eliminates manual intervention, significantly increasing processing speed while maintaining reasonable equipment complexity through standardized components.
4Manufacturing precision
If etchant is applied generously, then etching coverage is complete, but etchant consumption increases
Solution Approach 1:
The patent uses a spray mechanism to apply etchant in a controlled manner. The spray system delivers etchant uniformly onto the vertically positioned substrate surfaces, ensuring complete coverage while minimizing etchant consumption through precise delivery control, thus resolving the contradiction between etching coverage and etchant consumption.
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 ensures uniform etching of glass substrates, reduces the risk of over-etching, minimizes etchant usage, and significantly enhances the efficiency and cost-effectiveness of the LCD fabrication process by automating the etching line and allowing for more substantial weight reduction of the glass substrates.
Implementation Method 1
an etching unit to etch the substrate disposed perpendicular by the cassette fixing unit
Data Source
AI summary
A substrate etching apparatus includes: a cassette to receive a substrate that has finished a previous process, and transfer the substrate; a first robot to take the substrate out of the cassette; a second robot to receive the substrate from the first robot and move the substrate mounted thereon vertically up and down; an etching cassette comprising a support to support the substrate and a holder to fix the substrate loaded from the second robot; a cassette fixing unit to fix at least one or more etching cassettes and being rotated at a pre-set angle to allow the substrate to be disposed perpendicular to the ground; and an etching unit to etch the substrate disposed perpendicular to the ground by the cassette fixing unit.