Electrophoretic Display Partition Walls for Color and Contrast
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Solution Overview
Problem
Existing electrophoretic displays (EPDs) face challenges in achieving high-quality full color capability and efficient manufacturing, particularly in reflective color displays using color filters, which result in poor whiteness and lack of a high-quality 'black' state.
Innovation Solution
The development of electrophoretic display structures featuring slanted, indented, or open partition walls filled with charged pigment particles in a dielectric solvent, allowing for enhanced color states and manufacturing through a roll-to-roll process, with partition walls made from materials like non-conductive carbon black or pigment black, enabling improved color display and contrast ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If color filters are used in reflective color displays, then full color capability is achieved, but whiteness quality deteriorates and black state quality deteriorates
Solution Approach 1:
The patent removes color filters from the display structure entirely. Instead of using color filters to achieve full color capability, the invention uses charged pigment particles that can be electrically controlled to display different colors. This extraction of the problematic color filter component eliminates the degradation of whiteness and black state quality while maintaining full color capability through the electrophoretic mechanism.
Solution Approach 2:
The patent changes the fundamental parameter of color generation from passive optical filtering to active electrical control of charged particles. By applying voltage, the display can control the position and orientation of charged pigment particles, enabling dynamic color changes without the quality degradation associated with color filters. This parameter change from optical to electrical control resolves the contradiction between color capability and image quality.
2Adaptability or versatility
If color filters are used in reflective color displays, then full color capability is achieved, but black state quality deteriorates
Solution Approach 1:
The patent removes color filters that prevent true black states. By using charged pigment particles in an electrophoretic fluid, the display can achieve true black when particles are positioned to block light, without the color filter interference that degrades black state quality. This extraction maintains full color capability while restoring reliable black state performance.
Solution Approach 2:
The patent uses consumable electrophoretic fluid containing charged pigment particles that can be replenished. This approach allows for true black states and full color capability without the permanent degradation caused by color filters, effectively replacing the non-renewable color filter layer with a renewable electrophoretic system.
3Ease of manufacture
If traditional EPD manufacturing processes are used, then manufacturing is achieved, but manufacturing efficiency deteriorates
Solution Approach 1:
The patent enables continuous roll-to-roll manufacturing of electrophoretic displays. The process continuously deposits electrophoretic fluid containing charged pigment particles onto flexible substrates moving through the manufacturing line, eliminating batch processing steps. This continuous action maintains manufacturing feasibility while dramatically improving productivity and efficiency compared to traditional discrete manufacturing methods.
Solution Approach 2:
The patent replaces complex mechanical assembly processes with a simplified deposition and curing system. The electrophoretic fluid is deposited and then cured using UV light or other energy sources, substituting multiple mechanical assembly steps with a more efficient energy-based processing method that improves manufacturing speed and efficiency.
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 proposed display structures achieve enhanced color states and manufacturing efficiency, providing improved whiteness and high-quality 'black' states, along with increased contrast ratios, suitable for both full color and binary color systems.
Implementation Method 1
An electrophoretic display (EPD) is a non-emissive device based on the electrophoresis phenomenon influencing charged pigment particles suspended in a solvent
Data Source
AI summary
This invention relates to a display device comprising a plurality of display cells, wherein said display cells are separated by slanted partition walls. This invention also relates to a display device comprising a plurality of display cells, wherein said display cells are separated by indented partition walls having indented areas. The electrophoretic structures of the present invention may be manufactured by a continuous or semi-continuous roll-to-roll manufacturing process. The structures in which display cells are separated by slanted partition walls or partition walls having indented areas are capable of providing enhanced color states.