Zigzag Partition Electrode for Electrophoretic Display Brightness
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Solution Overview
Problem
Electrophoretic display devices face a challenge in maintaining sufficient memory property while ensuring high brightness, as increasing the partition height to match the flat electrode area for memory effect can compromise mechanical strength and reduce screen brightness due to the need for increased partition width, which occupies less space for the flat electrode.
Innovation Solution
The electrophoretic display device incorporates a partition with a zigzag or concave-convex shape in a planar view to increase the partition electrode area without raising the partition height, allowing for a reduced partition width that enhances brightness and maintains memory effect by making the partition electrode area comparable to the flat electrode area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the partition height is increased to match the flat electrode area for memory effect, then the memory property is improved, but the mechanical strength becomes insufficient and the partition width must be increased, which reduces the flat electrode area and deteriorates screen brightness
Solution Approach 1:
The partition surface is transformed from a flat two-dimensional structure to a three-dimensional zigzag or concave-convex structure. This dimensional change increases the surface area of the partition electrode without increasing the overall partition height, allowing sufficient memory effect while maintaining mechanical strength and avoiding reduction of the flat electrode area.
Solution Approach 2:
The partition surface is given a curved or undulating shape (zigzag or concave-convex) instead of being flat. This curvature increases the effective surface area of the partition electrode, enabling it to attract sufficient floating particles for memory effect while keeping the partition width and height limited, thus preserving mechanical strength and screen brightness.
2Strength
If the partition width is increased to ensure mechanical strength, then the mechanical strength is improved, but the flat electrode area is reduced, resulting in deteriorated screen brightness
Solution Approach 1:
Instead of increasing partition width to gain more electrode area, the invention transforms the partition surface into a zigzag or concave-convex three-dimensional structure. This allows the partition electrode area to be increased vertically through surface undulation rather than horizontally through width increase, preserving both mechanical strength and screen brightness.
3Strength
If the flat electrode area is reduced due to increased partition width, then the mechanical strength is maintained, but the screen brightness deteriorates
Solution Approach 1:
The invention compensates for the reduced flat electrode area by increasing the partition electrode area through three-dimensional surface structuring. The zigzag or concave-convex shape creates additional surface area on the partition electrode, balancing the electrode areas without requiring increased partition width, thus maintaining both mechanical strength and maximizing the flat electrode area for brightness.
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 allows for improved brightness and transmittance by maintaining the memory effect with reduced power consumption, as the partition electrode area is increased without compromising mechanical strength, enabling efficient image retention and display performance.
Implementation Method 1
The electrophoretic display device is configured to have a flat electrode to which the black floating particle is adhered for black display and a partition electrode to which the black floating particle is adhered for white display for each pixel so as to generate the images
Implementation Method 2
The partition has a surface formed to have a zigzag shape in a planar view. This makes it possible to make the partition electrode area large
Data Source
AI summary
A pixel is formed by sealing an insulating liquid and floating particles in an area defined by a first substrate, a second substrate and partitions. The width of the partition has to be reduced in order to improve the pixel brightness by enlarging a flat electrode. In this case, the height of the partition has to be reduced for retaining the mechanical strength. If the height of the partition is reduced, an area of the partition electrode becomes small, thus failing to retain the memory effect. The planar surface of the partition is then formed into a zigzag shape so as to increase the area of the partition electrode.