Color Electrophoretic Sub-pixel Structure Without Color Filters
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Solution Overview
Problem
Conventional electrophoretic displays suffer from reduced light utility efficiency, brightness, and color saturation due to the use of color filters, which are necessary for achieving color display.
Innovation Solution
A sub-pixel structure for color electrophoretic displays is introduced, utilizing charged particles of different diameters and electrical properties to achieve color display without the need for a color filter, leveraging the principle that electrophoretic velocity is inversely proportional to particle diameter to drive particles of varying colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a color filter is used to achieve color display, then color saturation is improved, but light utility efficiency deteriorates
Solution Approach 1:
The patent removes the color filter component from the display structure entirely. Instead of using a color filter to achieve color display, the invention uses charged particles with different colors that can be moved independently to different locations, thereby eliminating the need for color filters and improving light utility efficiency.
Solution Approach 2:
The patent assigns different colors to different charged particles (e.g., red, green, blue particles). By controlling the local distribution and movement of these differently colored particles to specific sub-pixel locations, the display achieves color rendering without requiring color filters, thus improving light efficiency while maintaining color saturation.
2Illumination intensity
If a color filter is used to achieve color display, then color saturation is improved, but brightness deteriorates
Solution Approach 1:
The patent eliminates the color filter structure that causes brightness loss. By using movable charged particles with inherent colors, the system allows more light to pass through without being absorbed or blocked by filter materials, thereby improving brightness while achieving color display.
Solution Approach 2:
The invention uses charged particles with different colors (such as red, green, blue particles) that can be positioned at specific locations. This local color assignment approach eliminates the need for color filters that reduce brightness, as the colored particles themselves provide the coloration function without the light-absorbing properties of filters.
3Illumination intensity
If a color filter is used to achieve color display, then color saturation is improved, but light utility efficiency deteriorates
Solution Approach 1:
The patent removes the color filter component and replaces it with a system of charged particles that have different colors. These particles can be moved to different locations to create color displays, eliminating the need for color filters and thereby improving light utility efficiency while maintaining color saturation.
Solution Approach 2:
The invention uses charged particles with different colors (such as red, green, blue particles) that can be positioned at specific sub-pixel locations. This local color assignment eliminates the need for color filters, allowing more light to pass through while maintaining high color saturation through the inherent colors of the particles.
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 enhances light utility efficiency, brightness, and color saturation by eliminating the need for color filters, allowing for effective display of multiple colors through the controlled movement of charged particles of different colors.
Implementation Method 1
leveraging the principle that electrophoretic velocity is inversely proportional to particle diameter to drive particles of varying colors
Data Source
AI summary
A sub-pixel structure of color electrophoretic display includes a driving unit, a display unit and a transparent electrode, wherein the display unit is disposed on the driving unit and the transparent electrode is disposed on the display unit. The display unit includes a plurality of first charged particles and a plurality of second charged particles. A color of the first charged particles is different from a color of the second charged particles. Diameters of the first charged particles are greater than diameters of the second charged particles. The first charged particles and the second charged particles have the same electrical property. The sub-pixel structure of color electrophoretic display has high light utility efficiency.