Displaced porous electrode for frustrating TIR and returning light through exit pupil
First Claim
1. A totally internally reflective display with a brightness enhancing structure to substantially absorb a reflecting light ray at an evanescent region, the display comprising:
- an optically transparent sheet having a surface further comprising a plurality of hemispherical protrusions on the inward side of the sheet;
a backplane electrode;
an apertured membrane between said optically transparent hemispherical surface and the backplane electrode;
a light reflecting electrode on an outward side of the membrane;
a single electrophoresis medium contained between said optically transparent hemispherical surface and the backplane electrode;
a plurality of electrostatically charged light absorbing electrophoretically mobile particles suspended in the medium; and
a voltage source to apply a voltage across the medium, between the light reflecting electrode and the backplane electrode to thereby modify the evanescent region to substantially absorb the reflecting light ray at the hemispherical surface.
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Accused Products
Abstract
A brightness enhancing structure for a reflective display incorporates a transparent sheet having an inward hemispherical surface, a backplane electrode, an apertured membrane between the hemispherical surface and the backplane electrode, and a light reflecting electrode on an outward side of the membrane. A voltage source connected between the electrodes is switchable to apply a first voltage to move the particles inwardly through the apertured membrane toward the backplane electrode, and a second voltage to move the particles outwardly through the apertured membrane toward the light reflecting electrode. Movement of the particles toward the light reflecting electrode frustrates total internal reflection of light rays at the hemispherical surface. Movement of the particles toward the backplane electrode permits total internal reflection of light rays at the hemispherical surface, and outward reflection from the light reflecting electrode toward the hemispherical surface of light rays which pass inwardly through the hemispherical surface.
136 Citations
29 Claims
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1. A totally internally reflective display with a brightness enhancing structure to substantially absorb a reflecting light ray at an evanescent region, the display comprising:
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an optically transparent sheet having a surface further comprising a plurality of hemispherical protrusions on the inward side of the sheet; a backplane electrode; an apertured membrane between said optically transparent hemispherical surface and the backplane electrode; a light reflecting electrode on an outward side of the membrane; a single electrophoresis medium contained between said optically transparent hemispherical surface and the backplane electrode; a plurality of electrostatically charged light absorbing electrophoretically mobile particles suspended in the medium; and a voltage source to apply a voltage across the medium, between the light reflecting electrode and the backplane electrode to thereby modify the evanescent region to substantially absorb the reflecting light ray at the hemispherical surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A Totally Internally Reflective (TIR) display with a brightness enhancing structure to substantially absorb a reflecting light ray at an evanescent region, comprising:
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an optically transparent sheet having an internal and external surface, the internal surface of the optically transparent sheet further comprising a plurality of hemispherical protrusions; a backplane electrode; a membrane positioned between the optically transparent hemispherical surface and the backplane electrode, the membrane having a plurality of openings wherein each opening is sized to provide passage to one or more electrophoretically mobile solid particle; and a first electrode positioned on an outward side of the membrane; wherein the first and the second electrode exclusively are configurable to form a magnetic flux in the display. - View Dependent Claims (27, 28, 29)
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Specification