Electrophoretic displays with controlled amounts of pigment
First Claim
1. An electrophoretic medium comprising a plurality of at least one type of electrophoretic particle suspended in a suspending fluid and capable of moving therethrough upon application of an electric field to the electrophoretic medium, such that, when application of a specific electric field to the medium for time T suffices to switch the medium between its extreme optical states, variations in the time of application of this specific electric field within the range of 0.9 to 1.1 T will not change the optical properties of either extreme state of the electrophoretic medium by more than 2 units of L*, where L* has the definition:
- L*=116(R/R0)1/3−
16, where R is the reflectance and R0 is a standard reflectance value.
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Accused Products
Abstract
An electrophoretic medium has walls defining a microcavity containing an internal phase. This internal phase comprises electrophoretic particles suspended in a suspending fluid and capable of moving therethrough upon application of an electric field to the electrophoretic medium. The average height of the microcavity differs by not more than about 5 μm from the saturated particle thickness of the electrophoretic particle divided by the volume fraction of the electrophoretic particles in the internal phase.
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Citations
20 Claims
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1. An electrophoretic medium comprising a plurality of at least one type of electrophoretic particle suspended in a suspending fluid and capable of moving therethrough upon application of an electric field to the electrophoretic medium, such that, when application of a specific electric field to the medium for time T suffices to switch the medium between its extreme optical states, variations in the time of application of this specific electric field within the range of 0.9 to 1.1 T will not change the optical properties of either extreme state of the electrophoretic medium by more than 2 units of L*, where L* has the definition:
- L*=116(R/R0)1/3−
16, where R is the reflectance and R0 is a standard reflectance value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
- L*=116(R/R0)1/3−
Specification