Multi-color Electrophoretic Display Eliminating Color Filters
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Solution Overview
Problem
Existing electrophoretic display (EPD) devices require a color filter to achieve multi-color displays, which increases complexity and leads to lower color saturation and contrast due to light loss through additional optical paths.
Innovation Solution
A multi-color EPD device is developed using color capsules with photosensitive capsule shells containing dielectric fluid and electrophoretic particles, eliminating the need for a color filter by forming latent images and developing them to create unit color pixels directly on a substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a color filter is applied to an EPD device to achieve multi-color display, then multi-color capability is obtained, but device complexity increases and light loss occurs leading to reduced color saturation and contrast
Solution Approach 1:
The patent merges the color filter function with the electrophoretic particles themselves. The electrophoretic particles are designed to inherently exhibit different colors (red, green, blue, etc.) depending on their movement state and positioning, eliminating the need for a separate color filter layer. This integration maintains multi-color capability while reducing device complexity and minimizing light loss through additional optical paths.
Solution Approach 2:
The electrophoretic particles serve multiple functions: they act as both the light-switching medium and the color-defining element. By making the particles themselves color-active rather than relying on a separate color filter, the system achieves multi-color display capability without adding structural complexity or suffering from light loss through multiple optical layers.
2Adaptability or versatility
If a color filter is applied to an EPD device to achieve multi-color display, then multi-color capability is obtained, but light loss occurs leading to reduced color saturation and contrast
Solution Approach 1:
The patent merges the color filter function with the electrophoretic particles themselves. The electrophoretic particles are designed to inherently exhibit different colors (red, green, blue, etc.) depending on their movement state and positioning, eliminating the need for a separate color filter layer. This integration maintains multi-color capability while reducing device complexity and minimizing light loss through additional optical paths.
3Adaptability or versatility
If a color filter is applied to an EPD device to achieve multi-color display, then multi-color capability is obtained, but additional processes are required increasing manufacturing complexity
Solution Approach 1:
The patent merges the color filter function with the electrophoretic particles themselves. The electrophoretic particles are designed to inherently exhibit different colors (red, green, blue, etc.) depending on their movement state and positioning, eliminating the need for a separate color filter layer. This integration maintains multi-color capability while reducing device complexity and minimizing light loss through additional optical paths.
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 allows for high color saturation and contrast without the need for a color filter, minimizing light loss and simplifying the display process, resulting in improved display quality.
Implementation Method 1
exposing the capsules to light to form a latent image of a color pattern image on the capsules
Implementation Method 2
electrophoretic particles dispersed in the dielectric fluid, wherein the plurality of color capsules are arranged to define subpixels of each of the unit color pixels
Data Source
AI summary
A multi-color electrophoretic display (EPD) device, an image sheet, and a method of manufacturing the same. The method of manufacturing the multi-color EPD device includes: forming capsules including photosensitive color-developing capsule shells each of which stores a dielectric fluid and at least one type of electrophoretic particles dispersed in the dielectric fluid; disposing the capsules in a unit color pixel area on a substrate; exposing the capsules to light to form a latent image of a color pattern image on the capsules; and developing the photosensitive color-developing capsule shells of the capsules to form unit color pixels including color capsules.