E-Paper Transmitter Display Refresh on Power Interruption
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Solution Overview
Problem
E-paper displays on digital wireless transmitters, such as those used by performers, fail to accurately update power status information when power is interrupted due to changes in power configuration or disconnection, leading to misleading user information.
Innovation Solution
Implement a processor that detects impending power interruptions using a shunt capacitor or a Hall sensor to refresh the e-paper display, ensuring accurate power status information by modifying or removing incorrect icons.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If an e-paper display is used to provide static information, then power consumption is reduced and readability in sunlight is improved, but the display cannot update information in real-time when power status changes
Solution Approach 1:
The system performs preliminary actions by detecting power status changes (voltage drops, battery removal, USB disconnection) before the e-paper display would show incorrect information. The processor monitors power supply voltage and detects when power is interrupted, then proactively updates the display to show accurate power status (e.g., low battery icon or power interruption icon) before the display would otherwise retain outdated information.
Solution Approach 2:
The system implements feedback by continuously monitoring power supply voltage through an ADC and comparing it against threshold values. When the voltage drops below the threshold indicating power interruption, the system responds by updating the e-paper display to reflect the current power status, ensuring the displayed information remains accurate despite the display's static nature.
2Loss of energy
If the e-paper display retains static information after power disconnection, then power efficiency is maintained, but misleading information is displayed about actual power status
Solution Approach 1:
The system performs preliminary detection of power status changes by monitoring voltage drops and detecting battery removal or USB disconnection events before the display would show misleading information. This allows the system to update the display with accurate power status information while maintaining the e-paper's power-efficient static display characteristics.
3Loss of information
If a processor continuously monitors power status to update the display, then information accuracy is improved, but power consumption increases
Solution Approach 1:
The system uses periodic action by monitoring power status at specific intervals and triggering display updates only when power status changes are detected. The processor monitors voltage periodically and activates the e-paper display refresh only when a power interruption event occurs, rather than continuously updating the display, thereby minimizing processor power consumption while maintaining information accuracy.
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
Ensures that the e-paper display provides accurate power status information even after power interruptions, preventing misinformation by updating the display before power is fully disconnected.
Implementation Method 1
a DC power supply, Vdc, from a power supply 104... a shunt capacitor 103 straddling the DC supply lines
Implementation Method 2
a Hall sensor 205 mounted to the chassis 201 of the RF transmitter 201... a magnet 206 (to activate the Hall sensor 205)
Data Source
AI summary
Methods and devices are provided for the construction of an electronic device, such as a digital wireless transmitter, containing an e-paper display that is sensitive to changes in the configuration of the power supply for the device. This display provides up-to-date accurate information to a user, even after a power disconnect.