Electronic Paper with Charged Magnetic Particles for Power-Off Writing
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Solution Overview
Problem
Current electronic paper devices require power to be turned on to rewrite content, making it inconvenient for applications like dynamic price labeling in supermarkets where information changes frequently.
Innovation Solution
Incorporating charged magnetic particles within microcapsules in the electronic ink layer, allowing for writing operations to be performed on electronic paper even when powered off by applying a magnetic field, which adjusts the thickness of strokes based on magnetic field intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If traditional electronic paper uses charged particles that require electric field for movement, then power consumption is reduced during static display, but content cannot be rewritten after powering off
Solution Approach 1:
The patent combines charged magnetic particles with both electric charge and magnetic properties, allowing the particles to respond to either electric fields (for normal display operation) or magnetic fields (for writing after power-off). This merging of functionalities enables the electronic paper to maintain its power-saving advantage while gaining the ability to be rewritten without requiring power to be turned on.
Solution Approach 2:
The patent changes the physical parameters of the particles by coating them with magnetic materials (such as ferrite or magnetite) while maintaining their electric charge. This parameter change allows the particles to interact with magnetic fields in addition to electric fields, enabling writing operations after power-off while preserving the original power-saving characteristics during normal display.
2Ease of operation
If magnetic field is applied to enable writing after power-off, then content can be rewritten without powering on, but stroke thickness is affected by magnetic field intensity
Solution Approach 1:
The patent makes the stroke thickness dynamic by allowing it to vary with magnetic field intensity. The system intentionally accepts this variability as it enables the core functionality of writing after power-off. The dynamic response allows flexible adaptation to different writing conditions and user needs, transforming a potential precision issue into a feature that provides writing flexibility.
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 convenient rewriting of electronic paper without the need for powering on, facilitating dynamic updates like changing prices on labels without complex operations.
Implementation Method 1
each microcapsule is provided therein with charged magnetic particles which are capable of being used to display at least one color
Implementation Method 2
the positively-charged white particles may be absorbed onto, and aggregated at, the electrode plate under the effect of the electric field
Implementation Method 3
depositing magnetic nanoparticles onto a surface of the charged sphere through a chemical plating process
Implementation Method 4
depositing a colored layer onto the surface of the charged sphere with the magnetic nanoparticles, a color of the colored layer being substantially identical to a color to be displayed by the charged magnetic particle
Implementation Method 5
the positively-charged white particles may be absorbed onto, and aggregated at, the electrode plate under the effect of the electric field
Implementation Method 6
In the case that a negative electric field is applied onto an electrode plate at an upper surface of the electronic paper, the positively-charged white particles may be absorbed onto, and aggregated at, the electrode plate under the effect of the electric field
Data Source
AI summary
The present disclosure relates to the field of display technology, and provides an electronic paper, a manufacturing method thereof, and a handwriting electronic paper device. The electronic paper includes: a first electrode; a second transparent electrode arranged opposite to the first electrode and at a display side of the electronic paper; and an electronic ink layer arranged between the first electrode and the second transparent electrode. Microcapsules are distributed in the electronic ink layer, and each microcapsule is provided therein with charged magnetic particles which are capable of being used to display at least one color.