LCD Panel Bonding Electrostatic Discharge for Inspection Accuracy
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Solution Overview
Problem
High-speed continuous production of liquid crystal display panels often misjudges non-defective products as defective due to electrostatic charging during the bonding process, leading to re-inspection issues and reduced productivity.
Innovation Solution
The system and method involve bonding the first polarizing plate to a substrate less susceptible to electrostatic decay followed by the second polarizing plate to a more susceptible substrate, allowing quick attenuation of electrostatic charges, enabling non-lighting optical inspection without applying voltage to the liquid crystal panel, thus synchronizing bonding and inspection speeds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If bonding process and inspection process are performed at high speed in continuous line, then productivity is improved, but measurement precision deteriorates due to electrostatic charging causing misjudgment of non-defective products as defective
Solution Approach 1:
The patent applies preliminary action by discharging electrostatic charge from the liquid crystal cell before the optical inspection process. The discharge process includes applying a voltage to drain accumulated electrostatic charge, ensuring the cell is in a neutral state before inspection. This preliminary discharge action prevents misjudgment of non-defective products as defective, maintaining inspection accuracy while enabling high-speed continuous production.
2Loss of time
If bonding speed is increased to match inspection speed in continuous line, then loss of time is reduced, but reliability deteriorates due to electrostatic charge affecting liquid crystal molecule alignment
Solution Approach 1:
The patent performs preliminary electrostatic charge discharge before optical inspection by applying a voltage to the liquid crystal cell to drain accumulated charge. This ensures accurate quality determination without requiring extended waiting periods, maintaining both production flow and inspection reliability.
Solution Approach 2:
The patent implements feedback control by monitoring the bonding process and electrostatic charge accumulation, then automatically adjusting the discharge process parameters. The system determines optimal discharge voltage and timing based on real-time conditions, ensuring reliable quality assessment while maintaining continuous production节奏.
3Ease of operation
If electrostatic charge is allowed to accumulate during high-speed bonding, then ease of operation is improved, but object-affected harmful factors increase due to changed liquid crystal molecule alignment
Solution Approach 1:
The patent converts the harmful electrostatic charge into a beneficial process feature by implementing a controlled discharge mechanism. The electrostatic charge that would normally cause misalignment issues is instead used as a controlled parameter - the system applies voltage to deliberately drain the charge in a controlled manner before inspection, transforming a harmful effect into a manageable process step that ensures accurate quality assessment.
Solution Approach 2:
The patent introduces an intermediary discharge process between bonding and inspection. The voltage application mechanism acts as an intermediary that mediates the transition from charged bonding state to neutral inspection state, preventing direct conflict between continuous bonding operation and accurate quality determination.
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 high-speed, high-quality continuous production of liquid crystal display panels by reducing the time between bonding and inspection, eliminating the need for re-inspection, and simplifying process control, thereby increasing production efficiency.
Implementation Method 1
the liquid crystal cell is electrostatically charged so that the alignment of the liquid crystal molecules are changed
Data Source
AI summary
The invention is a method for continuously manufacturing an inspected liquid crystal display panel, includes: a liquid crystal cell feeding step including feeding a liquid crystal cell having a first substrate and a second substrate; a first polarizing plate providing step including providing a first polarizing plate from a first polarizing plate roll; a first polarizing plate laminating step including laminating the first polarizing plate to the first substrate; a second polarizing plate providing step including providing a second polarizing plate from a second polarizing plate roll; a second polarizing plate laminating step including laminating the second polarizing plate to the second substrate to obtain a liquid crystal display panel after laminating the first polarizing plate to the first substrate; and an inspecting step including optically inspecting the liquid crystal display panel without applying voltage to the liquid crystal panel, wherein the first substrate is less susceptible to electrostatic decay in the liquid crystal cell than the second substrate.