Electronic-Paper Display Circuit with RF-Charged Capacitor Buffer
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Solution Overview
Problem
Existing display panels with electronic paper suffer from issues such as data loss and abnormal picture updates due to insufficient energy, particularly at lower refresh frequencies which increase power consumption.
Innovation Solution
A display panel design incorporating a capacitor energy storage module, antenna module, control module, and comparator to supply power to the electronic paper display unit when the capacitor voltage exceeds a threshold, along with a reduced refresh frequency and optimized transistor and ink layer configurations to stabilize power supply and reduce consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the refresh frequency of the electronic paper display unit is reduced to save power, then power consumption decreases, but data loss and abnormal picture updates occur due to insufficient energy
Solution Approach 1:
The antenna module and capacitor energy storage module perform preliminary energy accumulation before data transmission is needed. The capacitor is charged in advance through the antenna module receiving wireless signals, ensuring sufficient energy is available when the electronic paper display unit needs to refresh, thus preventing data loss while enabling lower refresh frequencies
Solution Approach 2:
The capacitor energy storage module acts as an intermediary between the antenna module (power source) and the electronic paper display unit (power consumer). It buffers and regulates energy supply, releasing stored energy during data transmission to ensure stable power delivery even when refresh frequency is reduced, thereby maintaining data transmission reliability
2Speed
If the refresh frequency is increased to improve display update speed, then picture refresh rate improves, but power consumption increases causing energy insufficiency
Solution Approach 1:
The system implements periodic action by charging the capacitor in intervals through the antenna module rather than continuous power supply. The electronic paper display unit refreshes at optimized intervals using energy stored in the capacitor, achieving acceptable picture refresh rates while significantly reducing overall power consumption compared to continuous operation
Solution Approach 2:
The invention changes the power supply parameter from direct battery/adapter power to capacitor-stored power. This parameter change allows the system to operate at lower refresh frequencies with sufficient energy availability, or at optimized refresh frequencies with reduced peak power demands, thereby lowering average power consumption while maintaining display performance
3Device complexity
If a simple power supply configuration is used to reduce device complexity, then device complexity decreases, but energy storage capacity is insufficient to support low refresh frequency operation
Solution Approach 1:
The antenna module serves multiple functions: it acts as both the wireless communication interface for data reception and the power supply interface for charging the capacitor. This multi-functionality eliminates the need for separate battery and charging circuitry, reducing device complexity while providing sufficient energy storage duration through the capacitor to support low refresh frequency operation
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
This design stabilizes power supply, reduces power consumption, and prevents data loss, enhancing the display effect by ensuring consistent data transmission and image refresh.
Implementation Method 1
an antenna module connected with the capacitor energy storage module and configured to charge the capacitor energy storage module in response to a radio frequency signal
Implementation Method 2
the electronic ink layer includes a microcapsule structure including white particles, black particles and electrophoretic ink
Data Source
AI summary
A display panel and a display apparatus. The display panel comprises an electronic-paper display unit and a display control circuit. The display control circuit comprises a capacitor energy storage module, an antenna module, a control module and a comparator, wherein the antenna module is connected to the capacitor energy storage module, and charges the capacitor energy storage module in response to a radio-frequency signal; the control module is connected to the capacitor energy storage module and the electronic-paper display unit; the comparator is connected to the control module and the electronic-paper display unit; and when the voltage of the capacitor energy storage module is greater than a preset threshold voltage, power is supplied to the electronic-paper display unit.