Blue Phase Liquid Crystal Display with Wavelength Selective Reflection
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Solution Overview
Problem
Blue phase liquid crystal displays require high driving voltage and have narrow operating temperature ranges, leading to issues with image display quality and ambient light reflection.
Innovation Solution
A display device using a blue phase liquid crystal layer with a reduced Kerr coefficient and increased pitch, selectively reflecting light within specific wavelength ranges (480-520 nm and 560-600 nm) to reduce driving voltage and minimize ambient light reflection, incorporating optical elements like polarizers and quarter wave plates to adjust light phases and absorb unwanted wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If blue phase liquid crystal is used to achieve fast response rate, higher contrast and wider viewing angle, then display performance is improved, but driving voltage becomes excessively high
Solution Approach 1:
The patent modifies the physical parameters of the blue phase liquid crystal by adjusting the pitch (periodic structure spacing) and Kerr coefficient through chemical composition control. By reducing the pitch and optimizing the liquid crystal material properties, the required driving voltage is reduced while maintaining the fast response rate characteristic of blue phase liquid crystals.
Solution Approach 2:
The patent employs composite material design by combining blue phase liquid crystal with specific chiral dopants and polymer networks. This composite structure enables tuning of the pitch and optical properties, allowing reduction of driving voltage while preserving the rapid response characteristics needed for high-speed display applications.
2Speed
If blue phase liquid crystal is used to achieve fast response rate, then dynamic image display capability is improved, but operating temperature range becomes narrow
Solution Approach 1:
The patent adjusts the thermodynamic parameters of the blue phase liquid crystal system by modifying the pitch and molecular structure. These parameter changes shift the phase transition temperatures, thereby expanding the operating temperature range while maintaining the fast response rate essential for dynamic image display.
3Use of energy by moving object
If blue phase liquid crystal selectively reflects light to reduce driving voltage, then energy efficiency is improved, but ambient light reflection control becomes challenging
Solution Approach 1:
The patent applies local quality control by implementing wavelength-selective reflection through precise pitch control in different regions or layers. The blue phase liquid crystal structure is engineered to reflect specific wavelengths (corresponding to the perceived color) while allowing other wavelengths to pass through, thereby controlling ambient light reflection characteristics locally while maintaining reduced driving voltage.
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 reduces the required driving voltage, maintains high response rates, and minimizes ambient light reflection while preserving luminous efficiency by selecting wavelengths for reflection that are within specific intervals, thus enhancing display performance and energy efficiency.
Implementation Method 1
The blue phase liquid crystal layer is disposed between the first and the second substrate and reflects a light selectively. A spectrum peak of the light is within an intersection interval corresponding to a cross point of x_bar, y_bar and z_bar stimulus value spectrums, and the intersection interval has a wavelength range from 480 nm to 520 nm
Implementation Method 2
The optical element has at least one function for adjusting a phase of the light or absorbing the light
Data Source
AI summary
A display device comprising a first substrate, a second substrate, a blue phase liquid crystal layer and an optical element is provided. The first substrate has a display area and is opposite to the second substrate. The blue phase liquid crystal layer is disposed between the first and the second substrate and reflects a light selectively. The spectrum peak of the light is within an intersection interval corresponding to a cross point of x_bar, y_bar and z_bar stimulus value spectrums, and the intersection interval has a wavelength range from 480 nm to 520 nm. The optical element has at least one function for adjusting a phase of the light or absorbing the light.