Liquid Crystal Purification via Water Extraction and Vacuum Degassing
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Solution Overview
Problem
Conventional methods for manufacturing liquid crystal display panels, such as the one drop filling method, face challenges in removing water-soluble impurities from the liquid crystal material, leading to display unevenness, especially in active matrix systems, as existing purification techniques like recrystallization and distillation are insufficient.
Innovation Solution
A liquid crystal material processing device and method that involves agitating a mixture of liquid crystal material and pure water in a vacuum chamber, separating impurities, and degassing the material to effectively remove water-soluble impurities and moisture, using a syringe with integrated mechanisms for discharge, agitation, and vacuum operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional purification methods (recrystallization, distillation) are used, then the liquid crystal material can be purified to some extent, but water-soluble impurities cannot be effectively removed
Solution Approach 1:
The invention changes the purification parameter from conventional methods (recrystallization, distillation) to a water-based extraction method. By adding pure water to the liquid crystal material and utilizing the solubility difference of water-soluble impurities in water versus liquid crystal material, the purification mechanism is fundamentally changed to effectively remove water-soluble impurities that conventional methods cannot eliminate.
Solution Approach 2:
Pure water is introduced as an intermediary substance to facilitate the removal of water-soluble impurities. The water acts as a mediator that selectively dissolves and extracts water-soluble impurities from the liquid crystal material through agitation and phase separation, enabling purification without directly modifying the liquid crystal material structure.
2Ease of manufacture
If liquid crystal material contains water-soluble impurities, then the manufacturing process is simpler, but display unevenness occurs particularly in active matrix systems
Solution Approach 1:
The purification step is performed as a preliminary action before the liquid crystal material is filled into the display device. By removing water-soluble impurities in advance through water-based extraction and phase separation, the material is pre-conditioned to prevent display unevenness, ensuring high manufacturing precision without complicating the overall manufacturing process.
3Productivity
If liquid crystal material is not degassed, then the processing is faster, but air and moisture remain causing display defects
Solution Approach 1:
The invention merges the purification and degassing operations into a single integrated process. By performing water-based purification followed by vacuum degassing in sequence within the same system, both air and moisture are removed simultaneously, ensuring display quality without requiring separate processing steps, thus maintaining high productivity.
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
The solution efficiently purifies and degasses the liquid crystal material, significantly reducing water-soluble impurities and preventing display unevenness, as demonstrated by improved voltage holding ratios in liquid crystal display panels, enhancing the manufacturing process and panel performance.
Implementation Method 1
causing water-soluble impurities contained in the liquid crystal material to transfer to the pure water
Implementation Method 2
the contents composed of the liquid crystal material and the pure water are left to stand still and separated into a liquid crystal material layer of an upper layer and a water layer of a lower layer
Implementation Method 3
The evacuation mechanism evacuates the vacuum chamber and allows the liquid crystal material to be degassed through the opened proximal end of the syringe
Data Source
AI summary
According to one embodiment, the liquid crystal material processing device includes a syringe containing contents composed of a liquid crystal material and the like, having a distal end portion constituting a first discharge pipe, an agitation mechanism agitating the contents of the syringe, a vacuum chamber having a second discharge pipe penetrating the bottom to connect to the first discharge pipe of the syringe. The agitation mechanism agitates the liquid crystal material and the pure water in the syringe, and purifies the liquid crystal material by causing water-soluble impurities to transfer to the pure water. The agitation mechanism agitates the liquid crystal material remaining in the syringe after the water layer has been discharged. The evacuation mechanism evacuates the vacuum chamber and causes the liquid crystal material to be degassed while the remaining liquid crystal material is agitated.