Cholesteric LCD Solar-Supercapacitor Power for Battery-Free Refresh
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Solution Overview
Problem
Conventional batteries used in cholesteric liquid crystal display devices have limited lifespan, require regular maintenance, and contribute to environmental issues due to the consumption of precious raw materials and mining impacts.
Innovation Solution
A cholesteric liquid crystal display device system that incorporates a supercapacitor as an energy storage module, powered by a solar battery unit, allowing for efficient energy storage and discharge to refresh display images without frequent replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional batteries are used for energy storage in cholesteric liquid crystal display devices, then the device can be powered, but the battery has limited lifespan and requires frequent replacement
Solution Approach 1:
The patent changes the fundamental parameters of the energy storage system by replacing conventional batteries with supercapacitors. Supercapacitors have different electrochemical characteristics with much longer cycle lives (over 1 million cycles versus thousands for batteries), eliminating the need for frequent replacements while maintaining reliable power supply for the display device.
Solution Approach 2:
The patent eliminates the use of disposable or short-lived batteries by implementing a supercapacitor-based energy storage system. Although supercapacitors have lower energy density, their extremely long operational lifespan makes them more economical over time by removing replacement costs and waste disposal requirements.
2Reliability
If conventional batteries are used for energy storage, then the device can operate, but significant raw metal materials are consumed and environmental impact increases
Solution Approach 1:
The patent changes the material composition and electrochemical parameters of the energy storage device. Supercapacitors use different materials (such as activated carbon, conductive polymers, or metal oxides) compared to conventional lithium-ion or lead-acid batteries, reducing dependence on scarce and environmentally damaging metals like lithium, cobalt, and lead.
Solution Approach 2:
By eliminating conventional batteries, the patent removes the entire lifecycle environmental burden including mining, processing, disposal, and replacement of battery materials. The supercapacitor system's longevity and material composition significantly reduce environmental harm.
3Quantity of substance
If conventional capacitors are used for energy storage, then the device can be powered, but the capacitance density is insufficient to store enough charges
Solution Approach 1:
The patent utilizes supercapacitors which achieve extremely high capacitance values (measured in farads rather than millifarads for conventional capacitors) through advanced electrochemical structures. This provides sufficient charge storage capacity to power the display device between solar charging cycles without requiring complex arrays of conventional capacitors.
4Power
If conventional capacitors are used for energy storage, then the device can operate, but they lack solid high-current discharge capability for short-term high-power output
Solution Approach 1:
The patent employs supercapacitors which inherently provide high power density and solid high-current discharge capability due to their low equivalent series resistance (ESR). This enables them to deliver the short-term high-power bursts needed for display refresh operations without requiring complex power management circuits or multiple capacitor banks.
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 system reduces environmental impact, lowers maintenance and replacement costs, and provides a reliable, self-powered display solution with a longer cycle life and consistent performance across varying temperatures.
Implementation Method 1
The light-receiving surface can convert a portion of the external light penetrating the cholesteric liquid crystal display unit into electrical energy
Implementation Method 2
the energy storage module has a much higher capacitance density, which allows them to store many charges
Implementation Method 3
Cholesteric liquid crystal display devices have the bi-stable characteristic and consume electrical energy to refresh the images
Data Source
AI summary
The present invention relates to a cholesteric liquid crystal display device, and a control method. The cholesteric liquid crystal display device includes a cholesteric liquid crystal display module, a solar battery unit, and a control unit. The control unit further includes an ambient energy management module and an energy storage module. The solar battery unit provides electrical energy to the management module. And the ambient energy management module stores electrical energy in the energy storage module. When it is necessary to refresh the images of the cholesteric liquid crystal display module, and the potential difference of the energy storage module reaches the charging cut-off voltage. The energy storage module can discharge the stored electrical energy to provide the electrical energy required by the cholesteric liquid crystal display module to refresh the image.