Rewritable Electronic Paper Image Retention via External Thermal Treatment
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Solution Overview
Problem
Rewritable electronic paper faces challenges in retaining images due to external influences like static electricity and pressure, and existing solutions using waxes or thermoreversible gelling agents either impair electrophoretic properties or require additional heating and cooling devices, leading to decreased display speed and increased weight.
Innovation Solution
A recording medium with an image recording layer containing microcapsules or cells encapsulating electrophoretic or magnetophoretic particles and a thermoreversible gelling agent, where at least one substrate includes a filler, allowing for improved image retention and stability without the need for internal heating or cooling devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermoreversible gelling agent is used to improve image retention, then image stability is improved, but display speed decreases due to heating and cooling requirements
Solution Approach 1:
The patent extracts the heating and cooling functions from the display device itself and relocates them to an external image recording device. The display medium contains only electrophoretic particles and dispersion medium without thermoreversible gelling agents, eliminating the need for thermal processing during display operation while maintaining image retention capabilities through external thermal treatment.
Solution Approach 2:
The patent introduces an external image recording device as an intermediary that performs heating and cooling functions. This external device acts as a mediator between the user and the display medium, providing thermal treatment only when needed for image recording or erasing, rather than requiring continuous thermal processing during normal display operation.
2Reliability
If internal heating and cooling devices are added to maintain image retention, then image stability is improved, but device weight increases
Solution Approach 1:
The patent removes the heating and cooling devices from the display device itself and places them in an external image recording device. This extraction eliminates the weight burden on the display device while maintaining the capability for thermal processing when needed for image recording and erasing operations.
3Ease of operation
If electrophoretic particles are used for display, then display functionality is achieved, but image retention deteriorates under external stress like static electricity and pressure
Solution Approach 1:
The patent applies thermal treatment in advance during the image recording process to fix the positions of electrophoretic particles before external stresses can affect them. By performing heating or cooling treatment during recording, the particles are locked in place, preventing subsequent image deterioration from static electricity, pressure, or other external influences.
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
The solution enhances image retention and stability by maintaining electrophoretic particles in place against external stress, while avoiding the drawbacks of previous methods, such as reduced display speed and increased weight, and allows for high-speed rewriting and erasing without additional hardware.
Implementation Method 1
a dispersion medium and a sol-gel transferable substance which is capable of transferring from a sol state to a gel state
Implementation Method 2
a dispersion system containing electrophoretic particles
Implementation Method 3
a dispersion system containing magnetophoretic particles
Implementation Method 4
at least one of the first substrate or the second substrate comprises a filler
Data Source
AI summary
A recording medium includes a first substrate; a second substrate; and an image recording layer provided between the first substrate and the second substrate, wherein the image recording layer has insulating properties and multiple cells or microcapsules, each of which encapsulates at least one of electrophoresis particles or magnetophoresis particles, a dispersion medium, and a thermoreversible gelling agent, wherein at least one of the first substrate or the second substrate contains fillers.