Blue Phase Liquid Crystal Display Low Voltage Operation
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Solution Overview
Problem
Conventional blue phase liquid crystal displays face challenges with high operating voltage and light leakage due to the use of high concentrations of chiral dopants, which shift the reflective band into the ultraviolet range, reducing contrast ratios.
Innovation Solution
A blue phase liquid crystal display device utilizing low concentrations of chiral dopants and a backlight module with multiple light sources generating primary colors, adjusting the reflective band to fall within the visible light range between primary color bands, thereby reducing operating voltage and preventing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If high concentrations of chiral dopants are used to shift the reflective band into the ultraviolet range, then light leakage is reduced, but operating voltage increases
Solution Approach 1:
The patent changes the concentration parameter of chiral dopants from high to low levels, which shifts the reflective band from ultraviolet to visible range. This parameter change simultaneously reduces operating voltage while managing light leakage through a different mechanism (multi-color backlight filtering).
Solution Approach 2:
The patent introduces a multi-color backlight module as an intermediary component that works with the blue phase liquid crystal layer. The backlight module generates specific primary colors (red, green, blue) and the liquid crystal layer reflects specific wavelengths, together achieving high contrast ratio without requiring high chiral dopant concentrations.
2Measurement precision
If high concentrations of chiral dopants are used to shift the reflective band into the ultraviolet range, then contrast ratio is improved, but the reflective band moves outside the visible light range causing color distortion
Solution Approach 1:
The patent changes the reflective band position from ultraviolet to visible light range by reducing chiral dopant concentration. This is compensated by using a multi-color backlight module that emits specific primary colors, ensuring the reflected light remains within the visible spectrum for proper color display.
Solution Approach 2:
The patent creates a composite system combining blue phase liquid crystal material with a multi-color backlight module. This composite approach allows the liquid crystal layer to reflect visible light wavelengths while the backlight provides the necessary color spectrum, achieving both high contrast ratio and accurate color reproduction.
3Use of energy by moving object
If low concentrations of chiral dopants are used, then operating voltage is reduced, but the reflective band falls within the visible light range potentially causing light leakage
Solution Approach 1:
The multi-color backlight module acts as an intermediary that prevents light leakage issues. By generating specific primary colors (red, green, blue) with defined wavelength ranges, the backlight ensures that the reflected light from the blue phase liquid crystal layer (with low chiral dopant concentration) remains within desired color boundaries, eliminating the need for high dopant concentrations to prevent leakage.
Solution Approach 2:
The patent changes the operational parameters by using low chiral dopant concentrations combined with a multi-color backlight system. This parameter change shifts the reflective band to the visible range while the backlight's specific color composition prevents light leakage, achieving low operating voltage without sacrificing display quality.
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 allows for operation at low voltages while maintaining high contrast ratios without light leakage, by adjusting the reflective band of the blue phase liquid crystal layer to be between primary color bands generated by the backlight module.
Implementation Method 1
the lattice period of the blue phase liquid crystals follows a function of the wavelength, and accordingly, a selective Bragg reflection would occur base on an incident light with different wavelengthes
Implementation Method 2
The chiral dopant can be used for inducing blue phase liquid crystal molecules to form aforesaid double twist cylinders
Implementation Method 3
the positive blue phase liquid crystal generally uses a lateral electric field induced by electrodes to change its refractive index, thereby enabling the blue phase liquid crystal to generate the change of the bright/dark state after light passing therethrough
Data Source
AI summary
A blue phase liquid crystal display device includes a backlight module and a blue phase liquid crystal display panel. The backlight module includes a plurality of light sources. The light sources generate a plurality of primary color lights with different bands. The blue phase liquid crystal display panel includes a blue phase liquid crystal layer. The blue phase liquid crystal layer includes a plurality of blue phase liquid crystal molecules and a plurality of chiral dopants. The blue phase liquid crystal layer has a reflection band. The reflection band is located between the bands of two adjacent primary color lights.