Electronic paper display device and driving method therefor
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Solution Overview
Problem
Existing technologies fail to display colors other than the color of the electrophoretic particles in the micro-cup, and the micro-cup can display colors other than the color of the electrophoretic particles. The micro-cup can only display a certain color when the electrophoretic particles in the micro-cup move to the display side, limiting the range of colors that can be displayed.
Innovation Solution
The electronic paper display device includes a first base substrate with a plurality of grooves passing through the second electrode, a microstructure with a paper film micro-cavity containing charged particles of different colors, and a third electrode, where the electrodes are light-transmitting and form both horizontal and vertical electric fields to control the movement of charged particles within the micro-cavity, allowing for multiple color display states including transparent states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrophoretic particles in the micro-cup move to the display side to display a certain color, then the display function is achieved, but the micro-cup cannot display colors other than the color of electrophoretic particles
Solution Approach 1:
The micro-cup is divided into multiple independent micro-regions, each containing electrophoretic particles of a specific color. This segmentation allows different regions to display different colors independently, enabling the micro-cup to display multiple colors simultaneously without requiring complex particle movement mechanisms.
Solution Approach 2:
Different regions of the micro-cup are assigned different local qualities by placing specific colored electrophoretic particles in each micro-region. This local differentiation enables the display of multiple colors while maintaining a relatively simple overall structure, as each region only needs to handle its specific color particles.
2Adaptability or versatility
If a single color of electrophoretic particles is used in the micro-cup, then the structure is simple, but the display can only show that specific color
Solution Approach 1:
The micro-cup is divided into multiple micro-regions, each containing electrophoretic particles of a specific color. This segmentation allows different regions to display different colors independently, enabling the micro-cup to display multiple colors simultaneously without requiring complex particle movement mechanisms.
Solution Approach 2:
Instead of using multiple colors of particles within a single uniform region (one-dimensional approach), the invention transitions to a two-dimensional spatial arrangement where different colored particles are distributed across multiple micro-regions. This dimensional change enables color variety while maintaining particle type simplicity in each individual region.
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 device can display multiple colors and transparent states by controlling the movement of charged particles using horizontal and vertical electric fields, enhancing the optical effects and user experience.
Implementation Method 1
providing driving signals to the first electrode, the second electrode, and the third electrode in the sub-pixel with the microstructure to be in the transparent state to drive charged particles of different electrical properties sequentially to approach a bottom of a paper film micro-cavity of the microstructure, and drive charged particles near the bottom of the paper film micro-cavity to side walls of the paper film micro-cavity
Implementation Method 2
The multiple micro-cups are controlled to display different colors by controlling electrodes located on both sides of the micro-cup to generate vertical electric fields
Data Source
AI summary
An electronic paper display device includes a first base substrate, and a plurality of sub-pixels on the first base substrate. Each sub-pixel includes: a first electrode on the first base substrate; a second electrode on the first electrode and including a plurality of grooves passing through thereof, the orthographic projection of the grooves on the first base substrate falling within the orthographic projection of the first electrode on the first base substrate; a microstructure on the side of the second electrode away from the first base substrate and including a paper film microcavity and a plurality of charged particles in the paper film microcavity, where the plurality of charged particles include a plurality of first color charged particles and a plurality of second color charged particles with opposite electrical properties; and a third electrode on the side of the microstructure away from the second electrode.