Curved LCD Pretilt Control via Dual Alignment Layers
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Solution Overview
Problem
Current methods for manufacturing curved liquid crystal display devices fail to effectively control and maintain different pretilt angles of liquid crystal molecules on adjacent substrates, leading to suboptimal display quality and texture defects.
Innovation Solution
A method involving the formation of a polyimide alignment layer on one substrate and a polymerized reactive mesogen alignment layer on the other, with controlled pretilt angles achieved through the use of specific alignment solutions and ultraviolet irradiation, allowing for distinct pretilt angles of liquid crystal molecules adjacent to each substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single alignment layer is formed on one substrate, then the manufacturing process is simple, but the pretilt angles of liquid crystal molecules adjacent to upper and lower substrates cannot be controlled differently
Solution Approach 1:
The alignment layer is divided into two separate layers: a first alignment layer formed on the lower substrate and a second alignment layer formed on the upper substrate. Each alignment layer can be independently configured with different materials, rubbing directions, or photopolymerization conditions to achieve different pretilt angles, thus resolving the contradiction between manufacturing simplicity and pretilt angle control precision
Solution Approach 2:
Different regions (upper and lower substrates) are equipped with different alignment layer properties. The first alignment layer on the lower substrate and the second alignment layer on the upper substrate have distinct characteristics that locally control the pretilt angles of liquid crystal molecules at each substrate interface, enabling independent optimization of each region's alignment properties
2Manufacturing precision
If different alignment layers are formed on upper and lower substrates to achieve different pretilt angles, then pretilt angle control is improved, but the device complexity increases
Solution Approach 1:
Both the first and second alignment layers can be formed using the same general process methodology (either both by rubbing or both by photopolymerization of reactive mesogens), allowing the system to maintain manufacturing process universality while achieving different local alignment properties. This reduces device complexity by avoiding the need for entirely different manufacturing approaches for each alignment layer
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 enhances display quality by ensuring different pretilt angles for liquid crystal molecules on upper and lower substrates, thereby improving texture and reliability of the curved liquid crystal display device.
Implementation Method 1
irradiating first ultraviolet rays at the reactive mesogen, and forming an alignment layer including the reactive mesogen polymerized by the first ultraviolet rays on a remaining substrate
Data Source
AI summary
Provided are a curved liquid crystal display device and a method of manufacturing thereof. The curved liquid crystal display device includes a bent first substrate, a second substrate which is disposed to opposite to the first substrate and bent, a liquid crystal layer disposed between the first substrate and the second substrate, a first alignment inducing layer disposed between the first substrate and the liquid crystal layer, and a second alignment inducing layer disposed between the second substrate and the liquid crystal layer. One of the first alignment inducing layer and the second alignment inducing layer includes a polymerized reactive mesogen, and the remaining alignment inducing layer includes a polyimide. Display quality of the device may be improved.