Microcup Display Substrate Stabilizing Electrophoretic Color
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Solution Overview
Problem
In electronic paper using electrophoretic display technology, the instability of color display due to built-in electric fields between differently charged particles leads to frequent refreshing and high power consumption, affecting the display effect and efficiency.
Innovation Solution
A display substrate with a microcup structure layer filled with electrophoretic fluid containing charged particles of the same electrical property, where the microcup design and electric field control allow particles to move to specific openings, eliminating the built-in electric field and reducing refresh time and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If particles with different electrical properties are used for color display, then color display capability is improved, but built-in electric fields cause instability and frequent refreshing is required
Solution Approach 1:
The patent divides the display medium into separate microcapsules, each containing particles of a single electrical property (either positive or negative). This segmentation prevents direct interaction between particles of opposite charges, eliminating the built-in electric fields that cause instability while preserving multi-color display capability through spatial arrangement of different microcapsule types.
Solution Approach 2:
The patent introduces a bipolar electrode as an intermediary control mechanism to manage particle behavior. By applying external voltages to the bipolar electrode, the system can selectively attract or repel particles in different microcapsules without relying on built-in electric fields, thus achieving stable color display through external control rather than internal field interactions.
2Adaptability or versatility
If particles with different electrical properties are used, then color display is enabled, but power consumption increases due to frequent refreshing
Solution Approach 1:
By segmenting particles into separate microcapsules with uniform electrical properties, the patent eliminates the need for frequent refreshing caused by unstable particle interactions. Each microcapsule maintains its particle configuration independently, reducing energy consumption while preserving color display functionality through the collective behavior of multiple microcapsule types.
Solution Approach 2:
The patent enables microcapsules to maintain their display state autonomously without requiring continuous energy input for refreshing. Once particles are positioned within a microcapsule, they remain stable without active control, allowing the display to maintain its state with minimal power consumption until the next intended state change.
3Ease of operation
If microcup structure with different opening sizes is used, then particle control is improved, but device complexity increases
Solution Approach 1:
The patent employs asymmetric microcup structures with differently sized openings to control particle ejection and retention. The asymmetric design allows selective passage of particles based on size and charge, improving control over particle positioning and color display states while the geometric simplicity of the asymmetric shape avoids excessive structural complexity.
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 solution stabilizes the color display, reduces refresh frequency, and decreases power consumption by preventing particle movement due to built-in electric fields, enhancing the display's efficiency and longevity.
Implementation Method 1
electrophoretic display technology, the colored particles with two different electrical properties are driven to move back and forth between a display side and a non-display side
Data Source
AI summary
A display substrate includes a first substrate, a microcup structure layer, an electrophoretic liquid and a second substrate. The first substrate includes a pixel electrode layer which includes a plurality of pixel electrodes. The microcup structure layer is disposed on a side of the first substrate. The microcup structure layer includes a plurality of microcups, each microcup has a first opening and a second opening opposite to the first opening, the first opening is closer to the pixel electrode layer than the second opening, a size of the first opening being greater than a size of the second opening. The electrophoretic fluid is filled in the plurality of microcups, and the electrophoretic fluid is incorporated with charged particles. The second substrate is disposed on a side, away from the first substrate, of the microcup structure layer with the electrophoretic fluid, and the second substrate includes a common electrode layer.