US5403518A
Expired / Lapsed
US
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Formulations for improved electrophoretic display suspensions and related methods
Assignee: AUO Corp
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Filing: 1993-12-02
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Granted: 1995-04-04
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Expires: 2013-12-02
Abstract
Abstract The invention provides an electrophoretic suspension comprising a suspension medium including tetrachloroethylene, 5-ethylidene-2-norbornene and an aromatic solvent including either a mixture of phenyl xylyl ethanes or a mixture of mono and di-benzyl toluene. The suspension further comprises a plurality of pigment particles dispersed in the suspension medium; a fluid dye dissolved in the suspension medium for providing a contrast with the pigment particles; and a charge control agent adsorbed on the pigment particles for preventing the pigment particles from agglomerating.
Inventors
- 👤 Frederic E. Schubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:29
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/165; G02F1/166; G02F1/167
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
57 words
An electrophoretic suspension comprising: a suspension medium comprising tetrachloroethylene, 5-ethylidene-2-norbornene and an aromatic solvent; a plurality of pigment particles dispersed in said suspension medium; a fluid dye dissolved in said suspension medium for providing a contrast with said pigment particles; and a charge control agent adsorbed on said pigment particles for preventing said pigment particles from agglomerating.
Claim 2
Dependent Claim
57 words
An electrophoretic suspension comprising: a suspension medium comprising tetrachloroethylene, 5-ethylidene-2-norbornene and an aromatic solvent; a plurality of pigment particles dispersed in said suspension medium; a fluid dye dissolved in said suspension medium for providing a contrast with said pigment particles; and a charge control agent adsorbed on said pigment particles for preventing said pigment particles from agglomerating.
Claim 3
Dependent Claim
18 words
The electrophoretic suspension according to claim 1, wherein said aromatic solvent is a mixture of phenyl xylyl ethanes.
Claim 4
Dependent Claim
19 words
The electrophoretic suspension according to claim 1, wherein said aromatic solvent is a mixture of mono and di-benzyl toluenes.
Claim 5
Dependent Claim
26 words
The electrophoretic suspension according to claim 1, wherein said tetrachloroethylene and said 5-ethylidene-2-norbornene are present in said suspension at a concentration of 91.9 percent by weight.
Claim 6
Dependent Claim
24 words
The electrophoretic suspension according to claim 1, wherein said aromatic solvent is present in said suspension at a concentration of 6.0 percent by weight.
Claim 7
Dependent Claim
25 words
The electrophoretic suspension according to claim 1, wherein said charge control agent is present in said suspension at a concentration of 0.8 percent by weight.
Claim 8
Dependent Claim
24 words
The electrophoretic suspension according to claim 1, wherein said fluid dye is present in said suspension at a concentration of 0.32 percent by weight.
Claim 9
Dependent Claim
26 words
The electrophoretic suspension according to claim 1, wherein said plurality of pigment particles are present in said suspension at a concentration of 1.0 percent by weight.
Claim 10
Dependent Claim
17 words
The electrophoretic suspension according to claim 1, wherein said suspension has a specific gravity of 1.43 grams/milliliter.
Claim 11
Dependent Claim
81 words
A process for making a suspension for an electrophoretic display, comprising the steps of: combining tetrachloroethylene with 5-ethylidene-2-norbornene and an aromatic solvent to form a suspension medium; adding pigment particles of a first color to said suspension medium; adding a charge control agent to said suspension medium to prevent agglomeration of said plurality of pigment particles; dissolving a fluid dye of a second color in said suspension medium; and ball milling said suspension medium to thoroughly disperse said pigment particles therein.
Claim 12
Dependent Claim
81 words
A process for making a suspension for an electrophoretic display, comprising the steps of: combining tetrachloroethylene with 5-ethylidene-2-norbornene and an aromatic solvent to form a suspension medium; adding pigment particles of a first color to said suspension medium; adding a charge control agent to said suspension medium to prevent agglomeration of said plurality of pigment particles; dissolving a fluid dye of a second color in said suspension medium; and ball milling said suspension medium to thoroughly disperse said pigment particles therein.
Claim 13
Dependent Claim
16 words
The process according to claim 10, wherein said ball milling is substantially eight hours in duration.
Claim 14
Dependent Claim
34 words
The process according to claim 10, further comprising the step of adjusting the specific gravity of said suspension to be slightly greater than the specific gravity of said pigment particles by adding said 5-ethylidene-2-norbornene.
Claim 15
Dependent Claim
19 words
The process according to claim 12, further comprising the step of centrifuging said suspension to remove unwanted particulate matter.
Claim 16
Dependent Claim
19 words
The process according to claim 13, wherein said centrifuging of said suspension is for 30 minutes at 5000 rpm.
Claim 17
Dependent Claim
16 words
The process according to claim 12, further comprising the step of homogenizing said suspension using ultrasound.
Claim 18
Dependent Claim
17 words
The process according to claim 15, where said step for homogenizing is approximately 8 seconds in duration.
Claim 19
Dependent Claim
15 words
The process according to claim 10, wherein said first color contrasts with said second color.
Claim 20
Dependent Claim
23 words
The process according to claim 10, wherein said tetrachloroethylene and said 5-ethylidene-2-norbornene are present in said suspension at a concentration of 91.9 percent.
Claim 21
Dependent Claim
28 words
The process according to claim 10, wherein said aromatic solvent is a mixture of phenyl xylylethanes present in said suspension at a concentration of 6.0 percent by weight.
Claim 22
Dependent Claim
30 words
The process according to claim 10, wherein said aromatic solvent is a mixture of mono and di-benzyl toluenes present in said suspension at a concentration of 6.0 percent by weight.
Claim 23
Dependent Claim
24 words
The process according to claim 10, wherein said charge control agent is present in said suspension at a concentration of 0.8 percent by weight.
Claim 24
Dependent Claim
23 words
The process according to claim 10, wherein said fluid dye is present in said suspension at a concentration of 0.32 percent by weight.
Claim 25
Dependent Claim
23 words
The process according to claim 10, wherein said pigment particles are present in said suspension at a concentration of 1.0 percent by weight.
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