Color display device
US-2016041448-A1 · Feb 11, 2016 · US
Additive particles for improving optical performance of an electrophoretic display
US9778537B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9778537-B2 |
| Application number | US-201615003661-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jan 21, 2016 |
| Priority date | Sep 23, 2011 |
| Publication date | Oct 3, 2017 |
| Grant date | Oct 3, 2017 |
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Abstract
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The present invention is directed to an electrophoretic fluid which comprises additive particles. The concentration of the additive particles in the electrophoretic fluid is 2.5% to 25% by weight and the additive particles are not seen at the viewing side during operation of the display. The resulting fluid can improve optical performance of a display device, such as image stability and contrast ratio. The present invention is also directed to an electrophoretic display comprising the electrophoretic fluid.
First claim
Opening claim text (preview).
What is claimed is: 1. An electrophoretic display comprising an electrophoretic fluid which comprises charged pigment particles and additive particles, wherein the additive particles are neutral buoyancy particles, all types of particles are dispersed in a solvent or solvent mixture, and the concentration of the neutral buoyancy particles in the electrophoretic fluid is more than 2.5% by weight, but not exceeding 25% by weight and the additive particles are not seen at the viewing side during operation of the display, wherein the neutral buoyancy particles are uncharged or have a charge which is less than 50% of the average charge carried by the charged pigment particles. 2. The display of claim 1 , wherein the neutral buoyancy particles have the same color as one type of charged pigment particles. 3. The display of claim 1 , wherein the neutral buoyancy particles have a color different from that of the charged pigment particles. 4. The display of claim 1 , wherein the neutral buoyancy particles are formed from a material selected from the group consisting of polyacrylate, polymethacrylate, polystyrene, polyaniline, polypyrrole, polyphenol and polysiloxane. 5. The display of claim 1 , wherein the neutral buoyancy particles are formed from a material selected from the group consisting of poly(pentabromophenyl methacrylate), poly(2-vinylnapthalene), poly(naphthyl methacrylate), poly(alpha-methystyrene), poly(N-benzyl methacrylamide) and poly(benzyl methacrylate). 6. The display of claim 1 , wherein the neutral buoyancy particles are formed from a material having a refractive index different from that of the solvent or solvent mixture. 7. The display of claim 1 , wherein the concentration of the neutral buoyancy particles in the electrophoretic fluid is in a range between 3% to 15% by weight. 8. The display of claim 1 wherein the concentration of the neutral buoyancy particles in the electrophoretic fluid is in a range between 3% to 10% by weight.
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Classifications
- G02F1/167Primary
by electrophoresis · CPC title
characterised by the composition or particle type · CPC title
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- What does patent US9778537B2 cover?
- The present invention is directed to an electrophoretic fluid which comprises additive particles. The concentration of the additive particles in the electrophoretic fluid is 2.5% to 25% by weight and the additive particles are not seen at the viewing side during operation of the display. The resulting fluid can improve optical performance of a display device, such as image stability and contras…
- Who is the assignee on this patent?
- E Ink California Llc
- What technology area does this patent fall under?
- Primary CPC classification G02F1/167. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 03 2017 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).