Electrophoretic Display Sub-Electrodes Horizontal Field
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Solution Overview
Problem
Existing electrophoretic display technologies face challenges in achieving efficient gray scale capabilities and reducing refresh time due to the need for large migration distances of charged particles, which increases the distance between the pixel electrode and the common electrode.
Innovation Solution
The display device incorporates a pixel electrode with multiple pixel sub-electrodes arranged to generate horizontal electric fields, allowing charged particles to move parallel to the display panel's surface, thereby reducing the distance between the pixel electrode and the common electrode and shortening the refresh time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If charged particles migrate vertically between pixel electrode and common electrode to achieve gray scale, then gray scale capability is achieved, but migration distance is large which increases device thickness and response time
Solution Approach 1:
The patent changes the migration direction of charged particles from vertical (perpendicular to substrate) to horizontal (parallel to substrate) by arranging sub-electrodes in specific patterns. This dimensional change allows particles to migrate within a shorter distance while still achieving gray scale control through differential voltage application to adjacent sub-electrodes.
Solution Approach 2:
The pixel electrode is divided into multiple sub-electrodes that can be independently controlled. By segmenting the electrode structure and applying different voltages to adjacent sub-electrodes, horizontal electric fields are created that guide charged particle migration within the liquid crystal layer without requiring large vertical migration distances.
2Manufacturing precision
If charged particles migrate over large distances to achieve gray scale switching, then gray scale capability is achieved, but refresh time increases
Solution Approach 1:
By transitioning from vertical to horizontal particle migration, the patent reduces the effective migration path length within the liquid crystal layer. Horizontal migration occurs across a shorter distance between sub-electrodes rather than across the full vertical thickness, thereby reducing response time while maintaining gray scale control.
Solution Approach 2:
The patent creates localized horizontal electric fields between adjacent sub-electrodes by applying differential voltages. This allows charged particles to migrate locally over short distances to achieve gray scale transitions, rather than requiring global vertical migration across the entire cell thickness, thus reducing refresh time.
3Manufacturing precision
If vertical electric field is used to control charged particle aggregation, then gray scale is achieved, but device thickness increases
Solution Approach 1:
The patent replaces vertical electric field control with horizontal electric field control by arranging sub-electrodes to generate fields parallel to the substrate. This allows gray scale control to be achieved through horizontal particle positioning rather than vertical aggregation, reducing the required device thickness.
Solution Approach 2:
By segmenting the pixel electrode into multiple sub-electrodes with independent voltage control, the patent creates horizontal electric field zones that control particle distribution laterally. This segmentation enables gray scale control without requiring the large vertical electrode separation needed for vertical field control, thus reducing device thickness.
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 enables faster gray scale switching and improved reflectivity by reducing the migration distance of charged particles, thus enhancing the display's efficiency and reducing its thickness.
Implementation Method 1
the pixel sub-electrodes are arranged to generate horizontal electric fields, allowing charged particles to move parallel to the display panel's surface
Implementation Method 2
The electrophoretic liquid in the electrophoretic liquid layer includes electrophoretic particles with different colors. By controlling electrodes on both sides of the electrophoretic liquid layer to generate a vertical electric field, an aggregation degree of the electrophoretic particles with different colors at a bottom and a top of the cell can be adjusted
Data Source
AI summary
Embodiments of the present disclosure provide a display device and a driving method. The display device includes a display panel that includes a plurality of pixels, each of the plurality of pixels includes a pixel electrode, wherein the pixel electrode includes a plurality of pixel sub-electrodes spaced from each other; and a drive circuit configured to load a first drive voltage with different maintaining durations to at least part of a plurality of pixel sub-electrodes in a set pixel through a signal output terminal in a picture display stage, so that the set pixel is switched from a first state to a second state; wherein the set pixel is at least one of the plurality of pixels.