Electrophoretic Display Cell Subpixel Segmentation
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Solution Overview
Problem
Conventional electrophoretic display devices require multiple pixels to display a single color, resulting in inefficient color area usage and reduced chroma, as they rely on controlling individual pixels to achieve desired colors.
Innovation Solution
An electrophoretic display device with spatially divided cells containing different color substances, where each cell displays a complementary color, allowing for the mixing of colors to achieve a single display color with three cells, thereby improving single color display efficiency and chroma by controlling the electrophoretic movement of charged particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional electrophoretic display devices use multiple pixels to display a single color, then color display capability is achieved, but color area usage efficiency deteriorates and chroma is reduced
Solution Approach 1:
The invention divides each pixel into multiple sub-pixels, where each sub-pixel contains different colored particles (white, black, and colored particles). This segmentation allows each pixel to independently display different colors through controlled particle movement, eliminating the need for multiple pixels to display a single color and thereby improving color area usage efficiency.
Solution Approach 2:
The invention applies different colored particles (white, black, and colored particles with specific colors) to different regions within each pixel. By controlling the electrophoretic movement of these particles locally within each pixel, the display device can achieve full-color display capability while maintaining high color area usage efficiency and chroma.
2Illumination intensity
If conventional electrophoretic display devices control individual pixels to achieve desired colors, then color display is possible, but chroma deteriorates
Solution Approach 1:
The invention uses an asymmetric particle composition within each pixel, containing white particles, black particles, and colored particles in specific proportions. This asymmetric composition allows for optimized light reflection and absorption characteristics, enhancing color brightness while maintaining color purity through controlled particle distribution.
Solution Approach 2:
The invention changes the physical state and distribution parameters of particles within each pixel by applying electrophoretic control. By adjusting the voltage applied to move particles between sub-pixels, the display device can optimize color brightness and purity dynamically, achieving high chroma display without requiring multiple pixels.
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
This approach enables the display of a single color using three cells, reducing the pixel area required for color representation and enhancing color brightness and purity, particularly in white and black displays.
Implementation Method 1
When electrical fields are applied to a dispersion liquid in which charged particles are dispersed in a solution (dispersion medium), the particles move (electrophoretically migrate) in the dispersion medium by a Coulomb force.
Implementation Method 2
This phenomenon is called electrophoresis, and electrophoretic display devices (EPDs) that display desired information including images using the electrophoresis are known.
Data Source
AI summary
An electrophoretic display includes: a plurality of spatially divided cells; and plural types of color substances contained in each of the cells wherein a display color is controlled by controlling electrophoresis of the colored substances within the cells, wherein each of a first cell, a second cell and a third cell included in the plurality of cells includes a first color substance corresponding to a mutually differing one of three primary colors in additive color mixing or subtractive color mixing and a second color substance in a relationship of complementary colors with the first color substance, wherein the first cell is controlled to be in a display state by the first color substance, and the second and third cells are controlled to be in a display state by the second color substance, respectively.