LCD Cell Inlet for Liquid Crystal Dispensing Control
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Solution Overview
Problem
Existing methods for fabricating large-size LCD devices face challenges in accurately determining the amount of liquid crystal, leading to unfilled or overfilled regions, which degrade picture quality and increase costs due to discarded panels.
Innovation Solution
A method involving the formation of an inlet in the liquid crystal cell using pressure, allowing for controlled dispensing and sealing of liquid crystal, enabling precise adjustment and minimization of unfilled or overfilled regions by applying pressures to discharge excess liquid crystal or supplement insufficient amounts through strategically formed inlets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the dispensing method is used to fabricate large-size LCD devices, then the manufacturing time is reduced, but the precision of liquid crystal amount control deteriorates
Solution Approach 1:
The sealant is formed with a predetermined inlet structure before liquid crystal dispensing. This preliminary preparation allows for controlled liquid crystal injection through the inlet, enabling precise amount control while maintaining the speed advantages of the dispensing method for large-size LCD devices.
Solution Approach 2:
The inlet in the sealant acts as an intermediary structure that mediates between the liquid crystal source and the display cavity. It provides a controlled pathway for liquid crystal to enter the cavity, allowing precise dosage control without requiring post-manufacturing adjustments, thus resolving the contradiction between speed and precision.
2Loss of substance
If an insufficient amount of liquid crystal is dispensed, then the manufacturing cost is reduced, but the picture quality deteriorates due to unfilled regions
Solution Approach 1:
The inlet structure enables a feedback mechanism where liquid crystal can be dispensed in controlled amounts and any excess can be removed or additional liquid crystal can be added through the same inlet. This allows for verification and adjustment of the liquid crystal amount, ensuring complete filling without waste, thus resolving the contradiction between material savings and product quality.
3Quantity of substance
If an excess amount of liquid crystal is dispensed, then the liquid crystal amount is increased, but the picture quality deteriorates due to overfilled regions
Solution Approach 1:
The inlet structure serves as an extraction pathway that allows excess liquid crystal to be removed from the display cavity after dispensing. This enables the use of a slightly larger initial dispensing amount without risking overfilling defects, as the excess can be easily extracted through the inlet, resolving the contradiction between quantity control and quality assurance.
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 prevents unfilled or overfilled regions, enhancing picture quality and reducing waste and costs by allowing precise control over the liquid crystal amount in the LCD panel.
Implementation Method 1
forming an inlet in the liquid crystal cell while applying a first pressure to the liquid crystal cell
Data Source
AI summary
A method for fabricating a liquid crystal display (LCD) device includes: preparing a liquid crystal cell including a first substrate, a second substrate, liquid crystal between the first and second substrates, and a sealant surrounding the liquid crystal; forming an inlet in the liquid crystal cell while applying a first pressure to the liquid crystal cell; controlling an amount of the liquid crystal using the inlet; and sealing the inlet.