Liquid Crystal Display Without Polarizers Using Wavelength Conversion
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Solution Overview
Problem
Liquid crystal displays (LCDs) suffer from optical loss due to the presence of polarizers and color filters, which absorb a significant amount of light, reducing their efficiency.
Innovation Solution
The proposed LCD design eliminates the need for polarizers and color filters by using a light source, wavelength conversion layers with quantum dots or phosphors, and optical shutters composed of liquid crystal molecules and dichromatic dye, which adjust light transmittance, allowing for improved light management without these components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If polarizers and color filters are used in LCD, then light can be controlled and color can be selected, but optical loss increases significantly
Solution Approach 1:
The patent removes the polarizer and color filter components from the traditional LCD structure. By extracting these components, the invention eliminates the optical loss they cause while maintaining the ability to control light and display colors through alternative means (wavelength conversion layers and optical shutters).
Solution Approach 2:
The invention changes the wavelength parameter of light using wavelength conversion layers that convert light to specific wavelengths. This parameter change approach replaces the need for polarizers and color filters, achieving color selection and light control without the optical loss of the removed components.
2Loss of energy
If polarizers and color filters are removed from LCD structure, then optical loss is reduced, but the structure becomes more complex
Solution Approach 1:
The patent combines multiple functions into integrated components. The wavelength conversion layer and optical shutter work together as a unified system that replaces both the polarizer and color filter functions, reducing structural complexity despite removing components.
Solution Approach 2:
The optical shutter component serves multiple functions: it acts as both a light modulator and works with the wavelength conversion layer to provide color selection. This multi-functionality reduces the need for separate components, simplifying the overall structure while maintaining reduced optical loss.
3Illumination intensity
If wavelength conversion layers and optical shutters are used instead of polarizers and color filters, then light transmission is enhanced, but manufacturing process becomes more complex
Solution Approach 1:
The patent introduces wavelength conversion layers as intermediary components that convert light to desired wavelengths. These layers serve as mediators between the light source and the display, enabling enhanced light transmission while providing a manageable manufacturing process through standardized conversion materials.
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 light transmission and color reproducibility, reducing optical losses and enabling a thinner, more efficient LCD structure.
Implementation Method 1
The first wavelength conversion layer is configured to convert the first light into a second light having a second wavelength longer than the first wavelength
Implementation Method 2
The first optical shutter... is configured to adjust transmittance of the first light or the second light, and comprises liquid crystal molecules and dichromatic dye
Implementation Method 3
The first optical shutter... comprises liquid crystal molecules and dichromatic dye
Implementation Method 4
The LCD may further comprise a selective light pass filter which is located on a path of the second light, is configured to reflect the first light, and is configured to transmit the second light
Implementation Method 5
The LCD may further comprise a long wavelength pass filter which is located on a path of the second light and a path of the third light, is configured to reflect the first light, and is configured to transmit the second light and the third light
Data Source
AI summary
A liquid crystal display (LCD) comprises a light source configured to provide a first light having a first wavelength, a first wavelength conversion layer configured to convert the first light into a second light having a second wavelength longer than the first wavelength, and a first optical shutter which overlaps the first wavelength conversion layer, is configured to adjust transmittance of the first light or the second light, and comprises liquid crystal molecules and dichromatic dye.