Electronic Ink Display Without Color Filter
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Solution Overview
Problem
Electronic ink display devices with color filters suffer from reduced optical efficiency, increased thickness, and complex manufacturing processes, necessitating a solution to display colors without a color filter.
Innovation Solution
An electronic ink panel with substrates and an electronic ink layer containing particles that respond to different voltage levels, allowing red, green, and blue particles to perform phoresis in specific sub-pixel regions using gamma voltage sets, eliminating the need for a color filter by selectively displaying colors based on voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is used in the electronic ink display device, then color images can be displayed, but the optical efficiency is reduced and the panel thickness increases
Solution Approach 1:
The patent removes the color filter layer from the electronic ink display device structure. By extracting this unnecessary component, the light transmission path is cleared, improving optical efficiency while simultaneously reducing the overall panel thickness. The electronic ink particles themselves serve as the color display mechanism, making the color filter redundant.
2Ease of manufacture
If a color filter is used in the electronic ink display device, then color images can be displayed, but the manufacturing process becomes more complex
Solution Approach 1:
The color filter layer is extracted from the device structure, simplifying the manufacturing process by reducing the number of layers that need to be deposited and aligned. This removal eliminates the need for complex color filter fabrication and alignment steps, thereby improving ease of manufacture while enhancing optical efficiency.
3Ease of manufacture
If particles respond to different voltage levels to display colors without a color filter, then manufacturing is simplified and optical efficiency is improved, but the driving mechanism becomes more complex
Solution Approach 1:
The patent utilizes different voltage level ranges to control the phoresis of particles with different colors. By changing the voltage parameter, the system selectively moves red, green, or blue particles to specific sub-pixel regions. This parameter-based control mechanism simplifies the physical structure while enabling complex color display functionality through electrical parameter modulation.
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 the display of color images without a color filter, resulting in a thinner panel, simplified manufacturing, and improved optical usability with enhanced image clarity.
Implementation Method 1
The particles have a negative or positive charge so that phoresis can be performed to the particles. Accordingly, electronic ink display devices display an image by applying electric fields to the electronic ink and regulating the phoresis of the particles in the electronic ink.
Implementation Method 2
Phoresis is performed with respect to the particles in response to an electric field applied between the first electrode and the second electrode pattern.
Data Source
AI summary
An electronic ink panel comprises an electronic ink layer, a first substrate and a second substrate. The electronic ink layer includes first to third particles responding to voltages in different level ranges. The first substrate has a first electrode facing one surface of the electronic ink layer. The second substrate has a plurality of second electrode patterns of a size of a pixel region. The second substrate faces the other surface of the electronic ink layer.