Blue Phase Liquid Crystal Display Electrode Structure
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Solution Overview
Problem
Liquid crystal display devices using blue phase materials face challenges in achieving high contrast and low power consumption due to the need for high white transmittance and efficient electric field control, particularly with high-viscosity blue phase liquid crystals.
Innovation Solution
The design incorporates a specific electrode structure with comb-like patterns on both substrates, allowing for an electric field to be applied in both lateral and oblique directions, enhancing liquid crystal molecule control and utilizing a blue phase liquid crystal material with a chiral agent to achieve high-speed response and wide viewing angles without the need for an alignment film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If blue phase liquid crystal material is used to achieve high-speed response and wide viewing angles, then response speed and viewing angle are improved, but white transmittance is reduced and contrast ratio is lowered
Solution Approach 1:
The liquid crystal layer is divided into multiple regions with different liquid crystal materials. Specifically, a first liquid crystal layer exhibiting a blue phase is used in regions where high-speed response is critical, while a second liquid crystal layer with different properties is used in other regions. This segmentation allows each region to contribute its optimal characteristics, maintaining high response speed in the blue phase region while improving overall white transmittance and contrast ratio through the complementary properties of the second liquid crystal layer.
2Speed
If blue phase liquid crystal material is used to achieve high-speed response, then response speed is improved, but power consumption is increased due to high viscosity
Solution Approach 1:
The liquid crystal display device is divided into multiple liquid crystal layers with different materials and properties. The first liquid crystal layer exhibiting a blue phase provides high-speed response, while the second liquid crystal layer is specifically selected to have lower viscosity characteristics. This segmentation allows the second layer to reduce overall power consumption by facilitating easier molecular reorientation, thereby compensating for the high viscosity of the blue phase material while maintaining the high response speed benefit.
3Illumination intensity
If multiple liquid crystal layers with different materials are used to improve white transmittance and contrast ratio, then optical performance is improved, but device complexity is increased
Solution Approach 1:
The liquid crystal display device employs a segmented structure with a first liquid crystal layer exhibiting a blue phase and a second liquid crystal layer with different material properties. This segmentation enables optimization of optical performance by having each layer contribute specific characteristics - the blue phase layer provides high-speed response and the second layer enhances white transmittance and contrast ratio. The segmentation principle allows systematic management of complexity through functional division, where each layer's complexity is justified by its specific performance contribution.
4Ease of operation
If first and second common electrode layers are provided on both substrates to control liquid crystal molecules in the film thickness direction, then molecular control is improved, but device complexity and manufacturing difficulty are increased
Solution Approach 1:
The patent implements electrode structures on both the first and second substrates, extending the electric field control from a single-plane configuration to a three-dimensional configuration that spans the film thickness direction. By providing first and second common electrode layers on both substrates, the invention creates electric fields that effectively control liquid crystal molecules throughout the entire thickness of the liquid crystal layers. This dimensional extension enables comprehensive molecular orientation control, achieving uniform optical properties and enhanced display performance despite the increased structural complexity.
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 configuration improves white transmittance, increases contrast ratio, and reduces power consumption by effectively controlling liquid crystal molecules across the entire liquid crystal layer, including the film thickness direction, even with high-viscosity blue phase materials.
Implementation Method 1
a first liquid crystal layer which exhibits a blue phase is sandwiched between a first substrate and a second substrate
Implementation Method 2
The pixel electrode layer and the common electrode layer are provided over an interlayer film which is provided so as to cover the transistor, and are arranged on the same surface of the interlayer film such that they are not in contact with each other
Data Source
AI summary
In a liquid crystal display device in which a liquid crystal layer exhibiting a blue phase is sandwiched between a first substrate and a second substrate, a pixel electrode layer is electrically connected to a drain electrode layer of a transistor and a common electrode layer is electrically connected to a conductive layer formed through the same steps as the drain electrode layer. The pixel electrode layer and the common electrode layer are over an interlayer film and spaced apart from each other. An opening formed in the interlayer film is filled with liquid crystal, and the liquid crystal layer is formed.