Cholesteric LCD Layer Stack With Photovoltaics for Light Leakage
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Solution Overview
Problem
Existing cholesteric liquid crystal displays face challenges in achieving high image quality and efficient self-power generation due to inefficiencies in light reflection and absorption, particularly with solar cells placed at the bottom layer not receiving sufficient light for effective electricity generation.
Innovation Solution
A reflective multilayer cholesteric liquid crystal display structure is designed with stacked selective light reflection modules for red, green, and blue light, incorporating thin-film photovoltaic modules between these layers to absorb leaked light and generate additional electricity, while maintaining clear reflection for improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If black solar cells are placed at the bottom layer of the display, then self-power generation capability is improved, but light absorption efficiency deteriorates because insufficient light reaches the bottom layer
Solution Approach 1:
The patent segments the photovoltaic function into multiple thin-film photovoltaic modules distributed across different layers (between color conversion layers) rather than concentrating all solar cells at the bottom layer. This segmentation allows each module to capture light at optimal positions, improving overall light absorption efficiency while maintaining self-power generation capability.
Solution Approach 2:
The patent transitions from a single-layer bottom-mounted solar cell configuration to a multi-dimensional distributed arrangement of thin-film photovoltaic modules across multiple layers. This dimensional change enables light absorption at multiple depths within the display structure, resolving the contradiction between power generation capability and light absorption efficiency.
2Manufacturing precision
If multiple color conversion layers are stacked to improve display quality, then image quality is improved, but light leakage increases
Solution Approach 1:
The patent extracts and removes leaked light from the system by positioning thin-film photovoltaic modules to absorb stray light between color conversion layers. This extraction approach eliminates the harmful light leakage effect while maintaining the multi-layer color conversion structure needed for high image quality.
Solution Approach 2:
The patent converts the harmful leaked light into a beneficial resource by using thin-film photovoltaic modules to absorb the stray light and generate additional electrical energy. This transforms the light leakage problem into an opportunity for enhanced self-power generation.
3Loss of energy
If thin-film photovoltaic modules are added to absorb leaked light, then light absorption efficiency is improved, but device complexity increases
Solution Approach 1:
The patent merges the photovoltaic energy generation function with the existing color conversion layer structure by integrating thin-film photovoltaic modules between the color conversion layers. This merging approach adds light absorption capability without creating entirely separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The thin-film photovoltaic modules serve multiple functions: they absorb leaked light to prevent image quality degradation and simultaneously generate electrical energy for self-power generation. This multi-functionality reduces the need for additional dedicated components, limiting complexity increase while improving light absorption efficiency.
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 proposed structure enhances image quality by minimizing light leakage and improves self-power generation through efficient light absorption and conversion to electricity, utilizing dye-sensitized solar cells for both blue and green light, thereby addressing the inefficiencies in existing technologies.
Implementation Method 1
a first cholesteric liquid crystal module, a second cholesteric liquid crystal module, and a third cholesteric liquid crystal module which sequentially stacked from top to bottom... The first cholesteric liquid crystal module reflects a first light, a second cholesteric liquid crystal module reflects a second light, and a third cholesteric liquid crystal module reflects a third light
Implementation Method 2
a first thin-film photovoltaic module and a second thin-film photovoltaic module... The first thin-film photovoltaic module absorbs the first light, a second thin-film photovoltaic module absorbs the second light... converts leaked light into electricity
Data Source
Figure 1
Figure 2~3
AI summary
A cholesteric liquid crystal display comprising a red, a green, and a blue cholesteric liquid crystal modules. It further comprises a first thin-film photovoltaic module disposed between the blue and the green cholesteric liquid crystal modules, and a second thin-film photovoltaic module disposed between the green and the first selective light reflection modules. The first thin-film photovoltaic module is partially photo-permeable in which the transmittance of blue light is lower than the transmittance of the other lights. It is preferably a dye-sensitized solar cell module which specifically responsible for harvesting blue light. The second thin-film photovoltaic module is partially photo-permeable in which the transmittance of green light is lower than the transmittance of the other lights. It is preferably a dye-sensitized solar cell module which specifically responsible for harvesting green light.