Electrophoretic Display Segmented Driving for Power Reduction
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Solution Overview
Problem
Conventional electrophoretic displays have high power consumption due to continuous power output during various operational periods, which limits their efficiency and longevity.
Innovation Solution
The electrophoretic display employs a segmented driving method with distinct periods for balance, mixing, and coloring, utilizing non-continuous and non-segmental output of balance, mixed, and driving signals, along with a power supply that can be energy-storing or solar-powered, reducing overall power consumption and enabling a lighter, thinner design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If continuous power output is used during operational periods, then display operation is maintained, but power consumption is high
Solution Approach 1:
The patent implements periodic action by dividing the display operation into distinct periods (balance period, mixing period, coloring period) with different power output states. During the balance period, power output is reduced or suspended to allow charge accumulation, while during mixing and coloring periods, power is activated for specific functions. This periodic operation pattern significantly reduces overall power consumption while maintaining display functionality.
Solution Approach 2:
The patent segments the continuous operation into discrete functional periods: balance period for charge accumulation, mixing period for particle dispersion, and coloring period for image formation. Each segment has optimized power requirements, allowing the system to reduce power output during less demanding segments while maintaining overall operational reliability.
2Use of energy by moving object
If energy-storing power supply is used, then power consumption is reduced, but device volume may increase
Solution Approach 1:
The patent employs flexible thin-film battery technology as the energy-storing power supply. This thin-film design provides sufficient energy storage capacity while maintaining a thin profile that does not significantly increase the overall device volume. The flexible shell structure allows integration into the display panel without adding substantial thickness.
3Use of energy by moving object
If solar-powered system is used, then power consumption is reduced, but manufacturing complexity increases
Solution Approach 1:
The patent integrates solar cells directly into the display panel structure, enabling the display to serve dual functions: visual display and power generation. The solar cells are incorporated as part of the panel layers, allowing the same structure to perform both display and energy harvesting functions, thereby reducing the need for separate power management components and simplifying overall manufacturing.
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 approach significantly reduces power consumption, allowing for a more energy-efficient and longer-lasting display with reduced volume, while maintaining optimal image quality and flexibility in image updating.
Implementation Method 1
In electrophoretic displays, a distribution of charged particles is controlled by electric fields, thereby changing a reflectivity of display area to ambient light for display
Data Source
AI summary
An electrophoretic display able to operate on a reduced power supply includes a display panel and a driving circuit electrically connected to the display panel. The display panel includes a plurality of first electrophoretic particles and a plurality of second electrophoretic particles. The driving circuit is configured to provide a balance signal to the display panel during a balance period, provide a mixed signal to the display panel during a mixing period, and provide a driving signal to the display panel during a coloring period. The balance period, the mixing period, and the coloring period are sequential in time, and a preset time interval is between each of the periods.