LCD Panel Edge Cutting for Gravity Defect Repair
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Solution Overview
Problem
LCD devices with column spacers suffer from gravity defects when exposed to high temperatures, causing liquid crystals to expand and separate from the substrates, leading to light leakage and requiring panels to be discarded before distribution.
Innovation Solution
A method involving cutting an edge of the LCD panel to exhaust excess liquid crystals and sealing the cut edge, using a sealant to contain the liquid crystal layer and prevent further leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If column spacers are used to maintain liquid crystal layer thickness, then the liquid crystal layer spacing is maintained, but gravity defects occur at high temperatures causing light leakage
Solution Approach 1:
The patent extracts and removes the excess liquid crystal material that causes gravity defects through edge cutting and vacuum extraction processes, separating the problematic excess material from the functional liquid crystal layer while maintaining the necessary spacer structure
Solution Approach 2:
The patent changes the physical state and distribution parameters of the liquid crystal material by controlling temperature, pressure, and vacuum conditions during the repair process, transforming the liquid crystal from a problematic expanded state at high temperature to a controlled distribution state
2Reliability
If LCD panels with gravity defects are discarded, then defective panels are removed from production, but manufacturing efficiency decreases and waste increases
Solution Approach 1:
The patent recovers potentially usable LCD panels by removing only the excess liquid crystal material causing defects, rather than discarding entire panels, thereby recovering manufacturing value from previously defective units
Solution Approach 2:
The patent converts the harmful effect of excess liquid crystal expansion at high temperature into a beneficial process by using controlled heating and vacuum to extract the excess material, transforming a defect-causing phenomenon into a repair mechanism
3Reliability
If the LCD panel edge is cut to remove excess liquid crystal, then gravity defects are eliminated, but the panel structure is modified
Solution Approach 1:
The patent segments the LCD panel repair process into distinct stages: edge cutting to create extraction pathways, vacuum extraction to remove excess material, and sealing to restore integrity, treating each as a separate functional step
4Reliability
If vacuum extraction is used to remove excess liquid crystal, then gravity defects are removed, but the extraction process complexity increases
Solution Approach 1:
The patent introduces a vacuum chamber as an intermediary environment to facilitate the extraction of excess liquid crystal, creating a controlled atmosphere that enables selective removal of material without directly contacting or damaging the panel
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 method effectively removes the gravity defect by controlling the liquid crystal distribution, improving production yield and preventing light leakage, allowing for the repair of defective panels.
Implementation Method 1
a sealant is filled between the first and second substrates at one edge of the LCD panel to seal the cut portion
Data Source
AI summary
A method for repairing a liquid crystal display (LCD) device is provided for an LCD device whose LCD panel has a gravity defect. The method includes the steps of cutting an edge of the LCD panel, applying pressure to a surface of the LCD panel to exhaust excess liquid crystal material through the cut edge, and sealing the cut edge.