Electrowetting Display Unit Separation Wall Spaces
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional electrowetting displays face issues with incomplete uniformity in the bright state, particularly in black-white mode displays, due to non-polar fluid remaining at the corners of pixel units, which reduces contrast and transmittance, affecting display quality.
Innovation Solution
The introduction of spaces on the separation walls within the fluid chamber allows the non-polar fluid to be stored within these spaces when a voltage is applied, preventing it from blocking light and enhancing transmittance and contrast by ensuring it is not attached to the corner or middle portion of the fluid chamber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a voltage is applied between the electrode and polar fluid to achieve bright state displaying, then the non-polar fluid is moved to form a partially transparent pixel point, but the non-polar fluid remains at the corner of the display unit causing incomplete uniformity and reduced display quality
Solution Approach 1:
The fluid chamber is divided into multiple sub-chambers by adding more separation walls. These separation walls create additional confinement spaces that prevent the non-polar fluid from accumulating at the corners, ensuring uniform distribution across the entire pixel area when voltage is applied.
Solution Approach 2:
The separation walls are strategically positioned at specific locations within the fluid chamber to create localized confinement zones. This local structural modification ensures that the non-polar fluid is prevented from forming corners in specific critical areas, achieving uniform brightness across the display pixel.
2Reliability
If the non-polar fluid is used for blocking light in black-white mode display, then the display can achieve bistable displaying, but the non-polar fluid remaining at corners reduces contrast and transmittance
Solution Approach 1:
By segmenting the fluid chamber into multiple sub-chambers using additional separation walls, the non-polar fluid is confined to specific regions rather than accumulating at corners. This segmentation maintains the bistable displaying capability while preventing corner accumulation that would reduce contrast.
Solution Approach 2:
The problem of corner accumulation is solved by adding a spatial dimension - vertical separation walls that create upper and lower sub-chambers. This dimensional change redirects the non-polar fluid distribution from horizontal corner accumulation to vertical confinement, maintaining contrast and transmittance.
3Manufacturing precision
If separation walls are added to confine polar fluid and non-polar fluid, then fluid control is improved, but device complexity increases
Solution Approach 1:
The fluid chamber is segmented into multiple sub-chambers by adding separation walls. This segmentation improves fluid confinement precision by creating distinct regions for polar and non-polar fluids, while the modular nature of the separation walls keeps the added complexity manageable.
Solution Approach 2:
The separation walls serve multiple functions: they confine the polar fluid, contain the non-polar fluid, and prevent fluid mixing between chambers. This multi-functionality reduces the need for additional components, thereby limiting the increase in device complexity while achieving precise fluid control.
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 solution improves the display quality by reducing the visibility of the non-polar fluid, thereby increasing transmittance and contrast, especially in full-white displays, and allows for better implementation of full-white mode displays.
Implementation Method 1
a polar fluid 1 is provided in the upper portion of the fluid chamber 10, and a non-polar fluid 2 is provided in the lower portion of the fluid chamber 10
Implementation Method 2
When a voltage is applied between the electrode 4 and the polar fluid 1 to realize a bright state for displaying, the contact surfaces of the polar fluid 1 and the medium layer 3 are polarized to have an increased surface energy, thus the surface tensile in the contact surfaces are changed
Implementation Method 3
the non-polar fluid layer blocks light or colors and typically is in the black color for a user
Data Source
AI summary
The disclosed technology provides an electrowetting display unit and an electrowetting display device. The electrowetting display unit comprises a polar fluid, a non-polar fluid that is colored, and separation walls for surrounding the polar fluid and the non-polar fluid; a medium layer located below the fluid chamber and in contact with the non-polar fluid or polar fluid in the fluid chamber; and an electrode located below the medium layer. Spaces are provided on the separation walls, have openings toward the medium layer, and function to completely or partially store the non-polar fluid when a voltage is applied between the polar fluid and the electrode. The electrowetting display device comprises the electrowetting display unit.