Electrokinetic Display Reservoir Segmentation for Neutral White State
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Solution Overview
Problem
Electrokinetic display systems face challenges in achieving a neutral white or clear optical state due to tinting from colorant particles, which affects the perceived color modulation in stacked multi-color displays.
Innovation Solution
A self-aligned black or opaque mask structure is introduced within the reservoir regions of the electro-optical display, ensuring it is only present where colorant particles collect, thereby preventing tinting and enhancing the clear aperture, allowing for bright, neutral white states and precise color control in stacked full-color displays, compatible with plastic roll-to-roll processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If colorant particles are collected in reservoir regions to provide a transparent state, then the display achieves a clear optical state, but the colorant particles tint the visible areas preventing a neutral white or clear optical state
Solution Approach 1:
The display device is segmented into a viewing area and a reservoir region. The reservoir region is further segmented into a first reservoir portion (visible through the viewing area) and a second reservoir portion (not visible). This segmentation allows colorant particles to be collected in the non-visible second reservoir portion, preventing tinting of the visible display area while maintaining optical clarity.
Solution Approach 2:
The harmful function of colorant particle collection (tinting) is extracted from the visible viewing area and relocated to the non-visible second reservoir portion. By taking out the particle collection function from the visible area, the display achieves neutral white or clear optical state without the harmful tinting effect.
2Illumination intensity
If colorant particles are collected in reservoir regions, then the display achieves a transparent state, but the clear aperture is reduced due to particle presence in visible areas
Solution Approach 1:
The reservoir region is segmented into visible and non-visible portions. The second reservoir portion is specifically designed to be non-visible, allowing particle collection to occur in this area without reducing the clear aperture of the visible display area. This maintains both optical clarity and maximum clear aperture.
Solution Approach 2:
The particle collection function is moved from the two-dimensional visible display area to a three-dimensional non-visible reservoir space. By utilizing the vertical dimension and non-visible space, the system achieves particle collection without compromising the clear aperture of the visible area.
3Adaptability or versatility
If a stacked multi-color display is used, then full-color display capability is achieved, but the tint from colorant particles in one layer affects the perceived color modulated by other layers
Solution Approach 1:
Each display device in the stacked configuration is segmented with its own reservoir region having visible and non-visible portions. This segmentation ensures that colorant particles in each layer are collected in non-visible areas, preventing cross-layer color interference and maintaining precise color modulation across all layers.
Solution Approach 2:
The tinting effect is extracted from each display layer by relocating particle collection to non-visible reservoir portions. This extraction prevents the harmful tinting from affecting the color accuracy of stacked layers, allowing full-color capability to be achieved without color interference between layers.
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 effectively prevents tinting, improves the clear aperture, and enables stacked full-color displays to achieve a bright, neutral white state with precise color control, simplifying the fabrication process while maintaining the optical effectiveness of the display.
Implementation Method 1
Electrokinetic display systems are electro-optical information displays that form visible images using one or more of electrophoresis, electroconvection, electrochemical interaction and/or other electrokinetic phenomena. The display systems may have a plurality of states, including a transparent (or clear) state and a colored (or dark) state. For example, electro-optical display systems that use electrophoretic phenomena to translate or move colorant particles may collect the particles at least substantially out of the viewing area of the display system in reservoir regions to provide a transparent state.
Data Source
AI summary
In one embodiment, a display element includes a first electrode, a second electrode, and a dielectric layer on the second electrode. The dielectric layer has recess regions therein. The display element includes an opaque layer on the second electrode within each recess region and a fluid with colorant particles between the first electrode and the second electrode.