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Colored fluids for electrowetting, electrofluidic, and electrophoretic technologies

An electro-wetting, electro-fluid technology, applied in the field of electro-wetting, can solve problems such as limited application

Active Publication Date: 2012-03-07
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 high temperature and expansion at freezing point, limit its application in these devices
While issues related to the use of water and conventional dyes are being addressed, there is still a clear need for improved color fluids for different electrowetting and electrofluidic devices

Method used

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  • Colored fluids for electrowetting, electrofluidic, and electrophoretic technologies
  • Colored fluids for electrowetting, electrofluidic, and electrophoretic technologies
  • Colored fluids for electrowetting, electrofluidic, and electrophoretic technologies

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] 100 parts of a 10% aqueous dispersion of self-dispersing C.I. Pigment Blue 15:4 (available from Cabot) 250C and 100 parts of deionized water were placed in a glass beaker and acidified with 50 parts of 30% HCl. The slurry was heated to 85-90°C and stirred at this temperature for one hour. The hot suspension was filtered, the filter cake was washed to neutral pH with deionized water, two washes with 100 parts methanol, and the pigment was dried overnight in a 50°C oven.

[0094] The dark blue powder is then ground. 10 parts of pigments were premixed with 90 parts of non-aqueous polar solvent propylene glycol (PG), followed by grinding the slurry for one hour to obtain a cyan fluid.

Embodiment 2

[0096] The fluid was prepared as described in Example 1, but using the non-aqueous polar solvent propylene carbonate instead of PG to obtain a cyan fluid.

Embodiment 3

[0098] The fluid was prepared as described in Example 1, but using a 10% aqueous dispersion of self-dispersing C.I. Pigment Red 122 (available from Cabot) 260M instead 250C. The crimson powder is then ground. 10 parts of pigment were premixed with 90 parts of propylene carbonate (PC), followed by grinding the slurry for one hour to obtain a red fluid.

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Abstract

Colored fluids for electrowetting, electro fluidic, or electrophoretic devices, and the devices themselves, are disclosed. The colored fluid can include a non not aqueous polar solvent having (a) a dynamic viscosity of 0.1 cP to 50 cP at 250C, (b) a surface tension of 25 dynes / cm to 55 dynes / cm at 250C, and (c) an electrowetting relative response of 40% to 80%. Such colored fluids further include a colorant selected from a pigment and / or a dye. In another embodiment, the colored fluid can include a non-polar solvent and an organic colorant selected from a pigment and / or a dye. Such colored fluids can be black in color and have a conductivity from 0 pS / cm to 5 pS / cm and a dielectric constant less than 3. The use of the colored fluids offers improvements in reliability, higher levels of chroma in the dispersed state, and the ability to achieve higher contrast ratios in display technologies.

Description

[0001] Cross References to Related Applications [0002] This application claims priority to U.S. Provisional Application No. 61 / 231,156, filed August 4, 2009, and U.S. Provisional Application No. 61 / 160,113, filed March 13, 2009, which are hereby incorporated by reference Introduce its entire content into this article. technical field [0003] The present invention relates generally to the field of electrowetting, and more particularly to colored fluids for use in electrowetting, electrofluidic or electrophoretic devices, and electrowetting, electrofluidic and electrophoretic devices. Background technique [0004] Electrowetting has become an attractive modulation scheme in various optical applications, partly due to the ideal combination of high brightness and contrast, large viewing angle, and fast switching speed. In addition, electrowetting displays consume relatively low power because no frontlight or backlight is required. For example, electrowetting has been used a...

Claims

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Application Information

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IPC IPC(8): G02B26/02
CPCG02B26/005C09B67/0084C09B67/009
Inventor J·C·海肯费尔德R·施瓦茨L·克拉普A·米拉尔契克S·G·维尔纳
Owner SUN CHEM CORP
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