WIDE OPERATING TEMPERATURE RANGE ELECTROPHORETIC DEVICE

摘要

An electrophoretic device (101) comprises a first electrode (60) and a second electrode (60) spaced apart from the first electrode (60). An electrophoretic cell (809) containing an electrophoretic ink (830) and one or more optically-transparent, non-planar, solid polymer elements (808) is located between the electrodes (60). The ink (830) includes charged particles (11) of at least one type suspended in an optically-transparent suspending fluid (820). The refractive indices of the solid polymer elements (808) and the suspending fluid (820) are matched to have a difference of less than 0.0075, and for half or more of the operating temperature range of the device (0° C.-70° C.), the thermo-optic coefficients (temperature coefficient of refractive index per Kelvin) of the solid polymer elements (808) and the suspending fluid (820) are matched to have an arithmetic-mean difference of less than 0.0002/K in magnitude.

主权项

1. An electrophoretic device comprising a first electrode and a second electrode spaced apart from said first electrode, and between said electrodes an electrophoretic cell containing an electrophoretic ink and one or more optically-transparent, non-planar, solid polymer elements, said ink including charged particles of at least one type suspended in an optically-transparent suspending fluid, at a visible wavelength, the refractive indices of said solid polymer elements and said suspending fluid being matched to have a difference of less than 0.0075, and for half or more of the operating temperature range of said device spanning at least 30 degrees Celsius, the thermo-optic coefficients, the respective differential do/dT of the refractive index n with respect to temperature T, of the solid polymer elements and the suspending fluid are matched to have an arithmetic-mean difference of less than 0.0002/K in magnitude.