Electrophoretic Display Erasure via External Data Retrieval
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Solution Overview
Problem
Conventional electrophoretic display devices face inefficiencies in erasing display content due to the need for high-capacity storage circuits and power exhaustion during extended use, leading to loss of image data and ineffective content erasure.
Innovation Solution
A display system with a dispersed system of electrophoretic particles between electrodes, where an electric field is generated according to display data to migrate particles and erase content, utilizing a display-data providing device to store and associate data with unique information, allowing efficient erasure even if display data is lost, and incorporating a nonvolatile memory and power generation for portability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a high-capacity storage circuit is used to store image data for erasing display content, then the erasing efficiency is improved, but the device complexity and power consumption increase
Solution Approach 1:
The patent extracts the storage function from the display device itself and relocates it to an external display-data providing device. The display device only retains minimal storage for correspondence information (identifiers), while the bulk image data is stored externally and transmitted as needed for erasure operations, thereby reducing device complexity while maintaining erasing efficiency.
Solution Approach 2:
The patent introduces correspondence information as an intermediary element that links display content with its source data. This intermediary allows the system to identify and retrieve the appropriate image data for erasure without requiring the display device to store the complete image data, thus resolving the contradiction between erasing efficiency and storage requirements.
2Reliability
If power is continuously supplied to maintain stored image data in the storage circuit, then the erasing function remains reliable, but power consumption increases during portability
Solution Approach 1:
The patent extracts the power-intensive data storage function from the portable display device and places it in an external display-data providing device. The display device only stores minimal correspondence information that requires negligible power, eliminating the need for continuous power supply during portability while maintaining the ability to retrieve full image data for erasure when needed.
Solution Approach 2:
The system performs preliminary actions by storing correspondence information in advance in the display device and maintaining the full image data in the external providing device. This preliminary setup allows the display device to quickly identify and request erasure data without needing to continuously power a large storage circuit, thus reducing power consumption while maintaining reliability.
3Loss of information
If the display data is lost during portability, then power exhaustion occurs, but the stored image data cannot be retrieved for efficient erasure
Solution Approach 1:
The patent uses correspondence information as an intermediary that remains stored in the display device even when image data is lost. This intermediary contains identifiers that enable the display device to request and retrieve the correct image data from the external display-data providing device, thus maintaining erasure efficiency even when direct data storage fails during portability.
Solution Approach 2:
The system maintains a copy of essential identification information in the display device while the full image data is maintained in the external providing device. This copying strategy ensures that even if the display device loses power or data during portability, the correspondence information serves as a key to retrieve the necessary erasure data from the external source.
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 efficient erasure of display content without high-capacity storage and maintains portability by using a nonvolatile memory and power generation, ensuring reliable content removal even without identified display data.
Implementation Method 1
Some of conventional nonluminescent display devices use an electrophoretic phenomenon (for example, refer to JP-A-2002-116733). Electrophoresis is a phenomenon in which when an electric field is applied to a dispersed system in which positively or negatively charged fine particles (electrophoretic particles) dispersed in liquid (dispersion medium), the electrophoretic particles migrate by Coulomb force.
Implementation Method 2
Electrophoresis is a phenomenon in which when an electric field is applied to a dispersed system in which positively or negatively charged fine particles (electrophoretic particles) dispersed in liquid (dispersion medium), the electrophoretic particles migrate by Coulomb force.
Data Source
AI summary
A display system includes a display device with a display section. A display-data providing device provides a display control signal containing display data to the display device. The display-data providing device stores display data to be provided to the display device and information corresponding to the display data in association with each other. The display device holds the corresponding information associated with the display data provided from the display-data providing device. If the display data is lost from the display device, and if the display-data providing device identifies the display content indicated by the corresponding information contained in the display-data identifying signal output by the display device, the display device erases the display content according to a second inverted erase signal sent from the display-data providing device, and the second inverted erase signal includes the display data corresponding to the display content identified by the display-data providing device.