Flexible LCD Polymer Barrier Alignment
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Solution Overview
Problem
Liquid crystal display devices using glass substrates are prone to breakage and deformation, limiting their size and portability, and current alignment methods like rubbing can lead to image retention and uneven cell gaps, affecting brightness and contrast.
Innovation Solution
A liquid crystal display device with plastic substrates and a polymer barrier formed between alignment layers, using monomers to create a stable cell gap and reduce image retention by aligning liquid crystals, with hydrophobic and hydrophilic functional groups in the alignment layers for controlled adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If glass substrates are used in liquid crystal display devices, then the devices are resistant to deformation, but they are prone to breakage and have limited size and portability
Solution Approach 1:
The patent changes the material parameter from glass to plastic substrate, transforming the display device from rigid to flexible. This parameter change enables the substrate to be deformable and portable while maintaining structural integrity through proper material selection and design
Solution Approach 2:
The patent uses composite material structures including plastic substrates combined with alignment layers, polymer barriers, and liquid crystal layers. This composite approach allows the flexible plastic substrate to achieve the necessary mechanical strength and stability that would be impossible with a single material
2Ease of manufacture
If rubbing method is used for aligning liquid crystal, then the alignment is achieved, but image retention and uneven cell gaps occur affecting brightness and contrast
Solution Approach 1:
The patent replaces the mechanical rubbing method with a polymer barrier formation method. Instead of using mechanical friction to align liquid crystal molecules, the invention uses a polymer layer formed by photopolymerization or thermal polymerization to provide alignment, eliminating the mechanical contact that causes image retention and cell gap unevenness
Solution Approach 2:
The patent changes the alignment mechanism from mechanical rubbing to chemical/physical polymer barrier formation. This parameter change in the alignment method eliminates the harmful mechanical action while achieving the desired liquid crystal alignment through the polymer layer's surface properties
3Ease of manufacture
If cell gap is not maintained uniformly in liquid crystal display device, then manufacturing is simpler, but image retention and surface stains occur
Solution Approach 1:
The patent applies preliminary action by forming the polymer barrier layer before final assembly and liquid crystal injection. This pre-formed barrier structure ensures that the cell gap is predetermined and maintained uniformly, preventing image retention and surface stains while keeping the manufacturing process relatively simple
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 maintains a uniform cell gap and reduces image retention, enhancing the display's durability and performance by using a polymer barrier to stabilize the liquid crystal alignment and prevent monomer adsorption.
Implementation Method 1
a polymer barrier formed between alignment layers, using monomers to create a stable cell gap
Implementation Method 2
a polymer barrier formed between alignment layers, using monomers to create a stable cell gap
Implementation Method 3
hydrophobic and hydrophilic functional groups in the alignment layers for controlled adhesion
Implementation Method 4
hydrophobic and hydrophilic functional groups in the alignment layers for controlled adhesion
Implementation Method 5
hydrophobic and hydrophilic functional groups in the alignment layers for controlled adhesion
Implementation Method 6
the solution maintains a uniform cell gap and reduces image retention, enhancing the display's durability and performance by using a polymer barrier to stabilize the liquid crystal alignment and prevent monomer adsorption
Data Source
AI summary
The present disclosure provides a liquid crystal display device and a method for manufacturing the same. The device includes: a first substrate; a second substrate spaced apart from and opposite to the first substrate; a first lower alignment layer formed on an upper surface of the first substrate; a first upper alignment layer formed on a lower surface of the second substrate; a second alignment layer formed in an array on either or both of an upper surface of the first lower alignment layer and a lower surface of the first upper alignment layer; a polymer barrier positioned between the first substrate and the second substrate, the polymer barrier formed on the array of the second alignment layer; and a liquid crystal positioned between the polymer barriers.