RF-Powered Electronic Paper Display Drive Circuit
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Solution Overview
Problem
Electronic paper display devices rely on batteries, which require frequent replacement and can cause environmental pollution, and existing solutions do not effectively address the need for a battery-free power source for continuous operation.
Innovation Solution
A display drive circuit for electronic paper displays that includes a capacitor unit charged via radio frequency signals, a voltage collection circuit, and a control circuit to manage power and transmission of image information, allowing the device to operate without a battery by using the stored energy to display images and then power off to conserve energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a battery is used as power source, then the electronic paper display device can operate continuously, but the battery requires frequent replacement and causes environmental pollution
Solution Approach 1:
The patent removes the battery from the electronic paper display device entirely, extracting the harmful power source that causes pollution and replacement needs. The device operates wirelessly by harvesting energy from radio frequency signals in the environment, eliminating the need for disposable batteries while maintaining continuous operation capability.
Solution Approach 2:
The electronic paper display device harvests its own operating energy from ambient radio frequency signals (such as WiFi, Bluetooth, or other wireless communications) without requiring external power sources or battery replacements. The energy harvesting circuit converts RF energy into electrical energy to power the display, making the system self-sufficient and eliminating environmental pollution from battery waste.
2Productivity
If energy is continuously supplied to maintain display operation, then the display can refresh continuously, but power consumption increases
Solution Approach 1:
The electronic paper display utilizes the inherent periodic nature of electrophoretic display technology, where the display medium maintains its state without continuous power. The display is refreshed periodically when energy is harvested from RF signals, rather than requiring continuous power supply. This periodic operation mode matches the bistable characteristics of electronic paper displays, consuming energy only when state changes are needed.
Solution Approach 2:
The patent changes the operational parameters of the display system by using variable threshold voltages for different operations (transmission threshold voltage of 2.3-3.3V, refresh threshold voltage of 3.6-4.7V). This allows the display to operate at different power levels depending on the operation type, optimizing energy consumption while maintaining display functionality. The control circuit dynamically adjusts voltage levels based on the specific task being performed.
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
Enables continuous operation of electronic paper displays without battery replacement, minimizing power loss and environmental impact by using radio frequency-induced charging and efficient energy management.
Implementation Method 1
an induction circuit and a communication circuit, wherein the induction circuit is configured to charge the capacitor unit in response to a radio frequency signal of a terminal device
Data Source
AI summary
The present disclosure relates to a display apparatus, a display drive circuit and a driving method of an electronic paper display unit, which relates to the field of display technology. The display drive circuit includes a display control circuit, the display control circuit includes a capacitor unit, a radio frequency circuit, a voltage collection circuit, and a control circuit. The radio frequency circuit includes an induction circuit and a communication circuit. The induction circuit can charge the capacitor unit in response to a radio frequency signal of the terminal device. The collection circuit can collect the voltage of the capacitor unit. The control circuit can perform the transmission action when the voltage of the capacitor unit reaches an operating threshold voltage of the electronic paper display unit; turn off the voltage collection circuit and the communication circuit after the transmission action is completed.