Liquid Crystal Dispensing Apparatus with Spacer Height Measurement
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Solution Overview
Problem
Current liquid crystal dispensing methods, such as the liquid crystal dipping injection and vacuum injection methods, are inefficient due to long injection times and material wastage, leading to increased costs and contamination of the liquid crystal material.
Innovation Solution
A liquid crystal material dispensing apparatus that measures the spacer height on a substrate to determine the precise amount of liquid crystal material needed, using a system that includes a spacer height measuring unit and a dispensing system to calculate and control the dispensing amount, ensuring accurate and efficient dispensing directly onto a glass substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If liquid crystal dipping injection or vacuum injection methods are used, then liquid crystal material can be injected into the display panel, but the injection time is long and material wastage occurs
Solution Approach 1:
The patent applies preliminary action by pre-calculating the exact amount of liquid crystal material needed based on the measured cell gap height before dispensing. The controller determines the dispensing amount in advance using the formula: dispensing amount = (dispensing area) × (measured cell gap height) × (liquid crystal material density). This pre-calculation approach eliminates the need for prolonged injection processes and prevents material wastage by ensuring precise dispensing from the beginning.
Solution Approach 2:
The patent implements feedback by using a sensor to measure the actual cell gap height and feeding this information back to the controller. The controller then adjusts the liquid crystal material dispensing amount based on this feedback. This closed-loop control system ensures that the exact amount of material is dispensed, eliminating both time-wasting trial-and-error processes and material wastage from over-dispensing.
2Productivity
If traditional injection methods are used, then liquid crystal material can be filled into the panel, but the process is inefficient and costly
Solution Approach 1:
The patent applies self-service by enabling the system to automatically measure the cell gap height, calculate the required liquid crystal material amount, and dispense the precise quantity without manual intervention. The controller autonomously determines the dispensing parameters based on sensor feedback, eliminating the need for time-consuming manual calculations and adjustments, thereby significantly improving fabrication efficiency and reducing dispensing time.
Solution Approach 2:
The patent replaces traditional mechanical injection systems with a precision dispensing system controlled by electronic sensors and a controller. Instead of using mechanical vacuum injection or dipping methods that are slow and imprecise, the system uses electronic feedback control to determine and execute the exact dispensing amount, substituting mechanical processes with electronic control to achieve faster and more efficient operation.
3Device complexity
If fixed amount dispensing is used, then dispensing process is simple, but it cannot adapt to variations in cell gap height
Solution Approach 1:
The patent applies dynamics by making the dispensing amount variable rather than fixed. The system dynamically adjusts the liquid crystal material dispensing quantity based on real-time cell gap height measurements. The controller modifies the dispensing parameters according to the actual cell gap conditions, enabling the system to adapt to variations in substrate spacing and ensure precise material filling for each specific case.
Solution Approach 2:
The patent implements parameter changes by varying the liquid crystal material dispensing amount based on the measured cell gap height parameter. Instead of using a fixed dispensing quantity, the system changes the dispensing parameter (amount of material) in response to changes in the cell gap parameter. This ensures that the dispensing process maintains high precision even when cell gap variations occur during manufacturing.
Data Source
AI summary
A liquid crystal material dispensing apparatus includes a spacer height measuring unit for measuring a height of a spacer on a substrate, and a liquid crystal material dispensing system for determining an amount of the liquid crystal material to be dispensed on the substrate based upon the measured spacer height and for dispensing the liquid crystal material onto the substrate.