Dual-Sided Electrophoretic Display Using Shared Layer and Selector
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing electrophoretic display devices are limited in their ability to display images on both the front and rear faces efficiently, as they require separate electrophoretic display layers and electrodes for each side, making them costly and difficult to manufacture.
Innovation Solution
A thin and low-cost electrophoretic display device configuration using a transparent element substrate, a transparent opposite substrate, and a selector to choose either substrate as the display side, with a common electrode and sensor to automatically determine the display orientation, allowing for dual-sided display with a single electrophoretic display layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate electrophoretic display layers and electrodes are provided for each display side, then dual-sided display capability is achieved, but device thickness increases and manufacturing cost increases
Solution Approach 1:
The patent merges the electrophoretic display layer and pixel electrodes into a single shared structure that serves both display sides. The electrophoretic particles are dispersed in a liquid crystal medium between the two substrates, and the same pixel electrodes control the display state on both front and rear faces, eliminating the need for separate display layers and reducing overall device thickness.
Solution Approach 2:
The patent makes the electrophoretic display layer and pixel electrodes universal components that perform dual functions. The electrophoretic display layer simultaneously provides display functionality for both the front and rear display sides, and the pixel electrodes serve both substrates, allowing a single structure to fulfill multiple display roles.
2Adaptability or versatility
If separate electrophoretic display layers and electrodes are provided for each display side, then dual-sided display capability is achieved, but manufacturing cost increases
Solution Approach 1:
The patent combines the electrophoretic display layer and pixel electrodes into a shared structure that serves both display sides. This merging reduces the total number of components that need to be manufactured and assembled, thereby lowering manufacturing costs while maintaining dual-sided display functionality.
Solution Approach 2:
The electrophoretic display layer and pixel electrodes are designed as universal components that serve both display sides simultaneously. This multi-functionality reduces material consumption and assembly steps, leading to cost-effective manufacturing compared to providing separate layers and electrodes for each side.
3Length of stationary object
If a single electrophoretic display layer is shared between both substrates, then device thickness is reduced and manufacturing cost decreases, but display control on both sides becomes challenging
Solution Approach 1:
The patent introduces dynamic control mechanisms including a substrate rotation mechanism that can rotate the first substrate relative to the second substrate, and a control device that dynamically adjusts display parameters based on the rotation state. This allows the system to adapt to different viewing orientations and maintain proper display control despite the shared electrophoretic display layer.
Solution Approach 2:
The patent implements feedback control where the control device monitors the rotation state of the substrates and automatically adjusts the display control signals accordingly. This feedback mechanism ensures that the electrophoretic particles are properly positioned and the display remains controllable and visually correct regardless of the substrate orientation.
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 dual-sided display with reduced manufacturing costs and maintains consistent light transmittance ratios on both sides, enhancing applications such as electronic paper and books by allowing image rotation and inversion.
Implementation Method 1
the electrophoresis phenomenon is a phenomenon that, for example, when an electric field is applied, fine particles move on the basis of Coulomb force in a disperse system in which fine particles (electrophoretic particles) are dispersed in liquid (disperse medium)
Implementation Method 2
a sensor may be provided to detect an upward facing surface of the electrophoretic display device
Data Source
AI summary
An electrophoretic display device includes a transparent element substrate, a transparent opposite substrate, an electrophoretic display layer, and a selector. The element substrate has at least one transparent pixel electrode. The opposite substrate has a common electrode that is in correspondence with the at least one pixel electrode. The electrophoretic display layer is held between the element substrate and the opposite substrate. The selector selects any one of the element substrate and the opposite substrate as a display side of the electrophoretic display layer.