Colored conductive fluids for electrowetting and electrofluidic technologies

A conductive fluid, colored technology, used in organic dyes, instruments, optics, etc., can solve problems such as dielectric breakdown

Active Publication Date: 2012-07-04
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the physical properties of water, such as expansion at high temperatures, high freezing point, low boiling point, and relatively high vapor pressure, can limit the application of such devices and lead to dielectric breakdown

Method used

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  • Colored conductive fluids for electrowetting and electrofluidic technologies
  • Colored conductive fluids for electrowetting and electrofluidic technologies
  • Colored conductive fluids for electrowetting and electrofluidic technologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] Prepare 1% potassium chloride (KCl) solution, sodium dodecyl sulfate (SDS) solution, and dodecyltrimethylammonium chloride (DTAC) solution in deionized water, respectively. Prepared according to the method described in "Ion and Liquid Dependent Dielectric Failure in Electrowetting Systems (Balaji Raj, Manjeet Dhindsa, Neil R. Smith, Robert Laughlin, and Jason Heikenfeld, Langmuir | 3b2 | Volume 9 | 13 / 8 / 09)" and Anion-purifying surfactant dodecyltrimethyloctanesulfonate (DTA-OS, dodecyltrimethylammonium octanesulfonate), the content of which is incorporated herein by reference in its entirety. Prepare a 0.05 wt% DTA-OS solution in deionized water. The conductivity of the solution is shown in Table 1 below.

[0105] Table 1: Conductivity results from dielectric breakdown experiments

[0106] the solution

[0107] 100nm Al according to the above procedure 2 o 3 and 50nm Cytop substrate to complete the dielectric breakdown experiment. Experimental results su...

Embodiment 2

[0109] A 0.013% sodium dodecyl sulfate (SDS) solution was prepared in deionized water. The solutions were tested for dielectric breakdown on substrates of different thicknesses of Parylene C substrates (one with 300 nm Parylene C, one with 700 nm Parylene C). like Figure 2A and 2B As shown, due to the small Na + cation, breakdown was observed with a positive DC voltage applied to thinner dielectrics. This demonstrates the importance of ion selection to allow the use of thin dielectrics in electrowetting devices to operate at low voltages.

Embodiment 3

[0111]0.013% and 1% sodium dodecyl sulfate (SDS) solutions were prepared in deionized water. The solutions were tested for dielectric breakdown on a 300 nm parylene HT substrate. like Figure 3A and 3B As shown, under positive DC voltage, no dielectric breakdown was observed for low concentration SDS solutions while high concentration solutions caused breakdown.

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Abstract

Colored conductive fluids for electrowetting or electrofluidic devices, and the devices themselves, are disclosed. The colored conductive fluid includes a polar solvent and a colorant selected from a pigment and / or a dye. The polar solvent has (a) a dynamic viscosity of 0.1 cP to 1000 cP at 25 DEG C, (b) a surface tension of 25 dynes / cm to 90 dynes / cm at 25 DEG C, and (c) an electrowetting relative response of 20% to 80%. The colored conductive fluid itself can have an electrical conductivity from 0.1[mu]S / cm to 3,000 [mu]S / cm and can have no greater than 500 total ppm of monatomic ions with ionic radii smaller than 2.0AA and polyatomic ions with ionic radii smaller than 1.45AA. The colored conductive fluid should not cause electrical breakdown of a dielectric in the device in which it is employed. An agent for controlling electrical conductivity can optionally be added to the colored conductive fluid.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to US Provisional Application No. 61 / 231,156, filed August 4, 2009, which is hereby incorporated by reference in its entirety. technical field [0003] The present invention relates to the field of electrowetting in general, and more particularly to colored conductive fluids for electrowetting or electrofluidic devices and electrowetting and electrofluidic devices. Background technique [0004] Due in part to the combination of high brightness and contrast ratios, large viewing angles, and fast switching speeds, electrowetting has become an attractive modulation scheme for a variety of optical applications. Also, because electrowetting displays do not require front or back lighting, they consume relatively little power. For example, electrowetting has been used to provide optical switches for optical fibers, light valves or filters for cameras and guidance systems, optical pickup devic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B26/00
CPCG02B26/004C09B67/0033G02B2207/115
Inventor L·克莱普J·海肯菲尔德A·米拉尔希克R·J·施瓦兹S·G·维尔纳M·狄德萨S·舍瓦利奥特
Owner SUN CHEM CORP
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