Segmented Common Electrode for Color Electronic Paper Display
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Solution Overview
Problem
Current electronic paper display technology is limited to black and white colors and struggles to achieve color display due to the complexity of electrophoretic particle movement under different voltages.
Innovation Solution
An electronic paper display panel is designed with a substrate configuration that includes a first and second substrate, an electrophoresis layer with black, white, and color electrophoretic particles, and a dual-sub-electrode electrode structure, allowing for different voltage signals to be applied to each sub-electrode within a pixel area to control the movement of electrophoretic particles for color and grayscale display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single common electrode and single pixel electrode structure is used, then the device structure is simple, but color display cannot be achieved
Solution Approach 1:
The common electrode is segmented into multiple sub-electrodes (first sub-electrode, second sub-electrode, third sub-electrode) that can be independently controlled with different voltages. This segmentation allows different electrophoretic particles (black, white, and color particles) to be controlled separately, enabling color display while maintaining a relatively simple overall electrode structure configuration.
2Adaptability or versatility
If different voltages are applied to control electrophoretic particle movement for color display, then color display is achieved, but the control complexity increases
Solution Approach 1:
By segmenting the common electrode into multiple independently controllable sub-electrodes, the system can apply different voltages to different regions within the same pixel. This allows sophisticated color and grayscale control through simple voltage differentiation, where the first sub-electrode controls black particles, the second controls white particles, and the third controls color particles, making the complex control task more manageable.
3Adaptability or versatility
If multiple electrophoretic particles (black, white, color) are used in the electrophoresis layer, then color display potential is achieved, but the particle movement control becomes very complicated
Solution Approach 1:
The segmented electrode structure provides dedicated control regions for different particle types. The first sub-electrode, second sub-electrode, and third sub-electrode can be independently voltage-controlled to manage black particles, white particles, and color particles respectively. This segmentation simplifies the control of multi-particle systems by providing separate control pathways for each particle type.
Solution Approach 2:
Different regions of the electrode structure are assigned different voltage characteristics to control specific particle types in specific locations. The first sub-electrode applies voltages optimized for black particle movement, the second for white particles, and the third for color particles. This local differentiation of electrode properties simplifies the overall control complexity by tailoring control characteristics to specific particle types.
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 configuration enables the achievement of color and grayscale display by controlling the movement of electrophoretic particles within a pixel area, overcoming the limitations of existing technologies.
Implementation Method 1
The electronic paper technology mainly uses an electrophoretic display technology... Movement of electrophoretic particles for electronic paper display under different voltages is very complicated
Data Source
AI summary
An electronic paper display panel, including a first and second substrate; an electrophoresis layer arranged between the first and second substrates, the electrophoresis layer including black electrophoretic particle, white electrophoretic particle and at least one color electrophoretic particle; a first electrode layer arranged at a side of the first substrate facing the second substrate including multiple first electrodes; a second electrode layer arranged at a side of the second substrate facing the first substrate including multiple second electrodes; and a drive circuit; multiple pixel areas correspond multiple second electrodes; each first electrode includes a first sub-electrode and a second sub-electrode placed in same pixel area, which are insulated from each other, correspond to one second electrode and are connected with drive circuit, the first sub-electrode receives voltage signal different from voltage signal the second sub-electrode receives; the first electrode is common electrode and the second electrode is pixel electrode.