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Dielectrophoresis display and method for controlling display of dielectrophoresis display

A display and dielectrophoresis technology, applied in the field of information display, can solve the problems of weakening the internal field intensity distribution of microcapsules or droplets, low refresh rate of the display, and high complexity, so as to improve the refresh rate, improve the unity, and simplify the complexity. Effect

Pending Publication Date: 2022-07-29
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology uses dielectrophoresis and electrophoresis to work together, and the surface of the particles needs to be charged, and the drive system combines DC and AC systems, which is relatively complex
In addition, the display unit of this technology is composed of microcapsules, the outer phase has higher conductivity and higher dielectric constant, so the microcapsule or even droplet system usually causes the droplet to move away from the high field strength area, so to a certain extent Weaken the field strength distribution inside the microcapsule or droplet, and there are problems with low display refresh rate or high driving voltage

Method used

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  • Dielectrophoresis display and method for controlling display of dielectrophoresis display
  • Dielectrophoresis display and method for controlling display of dielectrophoresis display
  • Dielectrophoresis display and method for controlling display of dielectrophoresis display

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Embodiment 1

[0070] The device display pixel unit of the dielectrophoretic display in this embodiment is composed of a reflective plate, a first driving electrode array, a first hydrophobic layer, an emulsion layer, a second hydrophobic layer and a transparent cover plate in order from bottom to top, and the reflective plate is composed of It is made of glass coated with white titanium dioxide or barium sulfate. Photolithography technology is used on the reflector, and the pattern of driving electrode array is photoetched with positive glue, and then the ITO driving electrode array is obtained by etching process. Then, a Teflon material is coated on the driving electrode array layer to form a first hydrophobic layer with a thickness of 10-1000 nanometers (if it is suitable, please modify it at your discretion). In order to avoid the fusion between the internal phase droplets, a pixel wall (dam) structure is formed on the first hydrophobic layer with SU8 series photoresist material, and the ...

Embodiment 2

[0074] Using the device structure similar to that in Example 1, changing the formulation of the emulsion material, the display color can be further expanded, and the yellow-dark blue display effect can be realized. like Figure 7 shown. A small amount of silicone oil emulsifier (MC-215 or EM90 emulsifier) ​​of 0.5-2% v / v is added to the silicone oil of the emulsion system. The inner phase droplets use deionized water with low conductivity, and add 0.03-0.09 wt% of orange-yellow IV dye and 8-12 wt% of blue polystyrene particles. like Figure 7 As shown in the figure, applying different alternating current signals to electrodes in different regions can display yellow letters "S" and "U" and a blue background area; conversely, changing the driving alternating current signal can display yellow background areas and blue letters" C" and "N". The applied electrical signal amplitude is 30Vpp and the frequency is 400kHz when the pattern is displayed.

Embodiment 3

[0076] Using a device structure similar to that in Example 1, the specific area of ​​the first driving electrode array in the DEP display is driven by an alternating current signal as required, such as Figure 8 As shown, the display effect of the pattern "flower", the number "7", and the pattern "heart" can be presented. Tilt the screen from 0-75 degrees, the quality of the displayed content is not significantly affected, and the colors presented are not sensitive to the viewing angle, so the monitor has the characteristics of a wide viewing angle.

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Abstract

The invention discloses a dielectrophoretic display which is sequentially composed of a reflecting plate serving as a substrate, a first driving electrode array, a first hydrophobic layer, an emulsion layer and a transparent cover plate from bottom to top, the emulsion layer is composed of emulsion, and the emulsion comprises an outer phase serving as a continuous phase, inner phase liquid drops and one or more particles located in the inner phase liquid drops. The first driving electrode array generates an alternating current electric field crossing the inner phase liquid drops by applying alternating current voltage and drives particles in the inner phase liquid drops to move. According to the dielectrophoresis display, multi-state display can be realized only by applying alternating voltage to at least one pair of electrodes. The driving force is mainly dielectrophoretic force, so that no specific requirement on surface charges of the particles exists. And in combination with the internal phase liquid drops, the colored particles and multi-state controllable dynamic switching, a multi-color continuous adjustable display effect is achieved, and bistable display can be realized.

Description

technical field [0001] The invention belongs to the technical field of information display, and in particular relates to a dielectrophoretic display and a method for controlling the display of information on the dielectrophoretic display. Background technique [0002] Reflective display technology: Different from traditional display technology, it relies on luminescent materials or backlight sources to form display effects. Reflective display technology relies on dynamic adjustment of display materials, natural lighting / ambient lighting conditions, and uses the principle of light reflection to form a display effect. Reflective display technology has the advantages of high definition and eye protection in strong light / outdoor environments. [0003] Existing reflective display technologies mainly include Reflective LCD, Bistable LCD, Electrophoretic Electronic Paper (EPD), Optical Interference Modulation (iMod Mirasol) and Electrowetting Display (EWD). Among them, electropho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/167G02F1/1685G02F1/1676G02F1/16757G02F1/1677G02B26/00
CPCG02F1/167G02F1/1685G02F1/1676G02F1/16757G02F1/1677G02B26/005G02F2001/1678
Inventor 水玲玲申诗涛冯昊强金名亮
Owner SOUTH CHINA NORMAL UNIVERSITY