Power Harvesting Hardware for Persistent E-Reader Displays
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Solution Overview
Problem
E-reader devices with bi-stable displays require frequent manual charging, as they do not have a mechanism to autonomously harvest power for maintaining static images or text over extended periods without significant power consumption.
Innovation Solution
Integration of power harvesting hardware within the display device that captures ambient energy, such as light, cellular signals, or kinetic energy, combined with display update hardware that controls updates based on sensed power levels, allowing the device to operate 'always on' without user intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If manual charging is used to power the display device, then the device can maintain static content for extended periods, but user interaction is required and permanent power access is needed
Solution Approach 1:
The display device incorporates power harvesting hardware that automatically captures ambient energy from the environment to recharge the power storage device, eliminating the need for manual charging operations. The system self-regulates by monitoring power levels and initiating updates only when sufficient energy is available, making the device autonomous and removing all user interaction requirements for power management.
2Duration of action of stationary object
If manual charging is used to power the display device, then the device can maintain static content for extended periods, but permanent power access is required
Solution Approach 1:
The power harvesting hardware automatically captures ambient energy from the environment, enabling the device to operate without permanent power infrastructure. This self-charging capability allows deployment in locations where traditional power access is not feasible, significantly improving adaptability to diverse installation environments while maintaining extended static content display duration.
Solution Approach 2:
The power harvesting hardware can capture multiple forms of ambient energy including light, cellular signals, and kinetic energy, making the device adaptable to various environmental conditions and power source availability. This multi-functional power harvesting approach enables the device to operate in diverse locations without requiring permanent electrical infrastructure.
3Loss of information
If the display is updated frequently to show new content, then information freshness is improved, but power consumption increases
Solution Approach 1:
The display update hardware continuously monitors the power storage device charge level and uses this feedback to intelligently control update operations. Updates are scheduled only when sufficient power is available, creating a closed-loop system that balances information freshness with power conservation. This feedback mechanism prevents power depletion while ensuring content is updated when energy conditions permit.
Solution Approach 2:
The display update hardware dynamically adjusts the update frequency and timing based on available power levels. When power is abundant, updates occur more frequently to maintain information freshness; when power is limited, updates are reduced or delayed. This dynamic adaptation allows the system to optimize the trade-off between information currency and power consumption in real-time.
Data Source
AI summary
A display device which includes an electronic paper display additionally comprises power harvesting hardware and display update hardware which is configured to control the updating of the electronic paper display based on a sensed power harvesting level which may, in various embodiments, be a current incoming power level as generated by the power harvesting hardware or a stored power level in a power storage device within the display device.