Reflective polarizer having improved properties and optical display with improved reflective polarizer
First Claim
Patent Images
1. A display comprising:
- a display module;
an optical cavity; and
a reflective polarizer between the display module and the optical cavity that transmits light of a first polarization and reflects light of a second polarization, wherein the reflective polarizer transmits at least 70% of visible light of the first polarization incident normal to a surface of the reflective polarizer, transmits less than 25% of visible light of the second polarization incident normal to the surface of the reflective polarizer and has less than 8% CRMS color for visible light at an angle of 45 degrees from normal to the surface of the reflective polarizer.
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Abstract
A multiple layer reflective polarizer 12 is described. This element is placed between and optical cavity 24 and an LCD module 16 to form an optical display. The reflective polarizer reflects some light into the optical cavity 24 where it is randomized and may ultimately emerge with the correct polarization to be transmitted out of the display.
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Citations
11 Claims
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1. A display comprising:
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a display module;
an optical cavity; and
a reflective polarizer between the display module and the optical cavity that transmits light of a first polarization and reflects light of a second polarization, wherein the reflective polarizer transmits at least 70% of visible light of the first polarization incident normal to a surface of the reflective polarizer, transmits less than 25% of visible light of the second polarization incident normal to the surface of the reflective polarizer and has less than 8% CRMS color for visible light at an angle of 45 degrees from normal to the surface of the reflective polarizer. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A reflective polarizer that, when illuminated with visible light, transmits light of a first polarization and reflects light of a second polarization, wherein the reflective polarizer transmits at least 70% of the visible light of the first polarization incident normal to a surface of the reflective polarizer, transmits less than 25% of the visible light of the second polarization incident normal to the surface of the reflective polarizer and has less than 8% CRMS color for the visible light at an angle of 45 degrees from normal to the surface of the reflective polarizer.
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8. A display comprising:
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a display module;
an optical cavity; and
a polymeric reflective polarizing film disposed between the display module and the optical cavity that transmits light of a first polarization and reflects light of a second polarization, wherein the reflective polarizing film transmits at least 70% of visible light of the first polarization incident normal to a surface of the reflective polarizer, transmits less than 25% of visible light of the second polarization incident normal to the surface of the reflective polarizer and has less than 8% RMS color for visible light at an angle of 45 degrees from normal to the surface of the reflective polarizer.
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9. A display comprising:
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a display module;
an optical cavity; and
a reflective polarizer, that substantially transmits light of a first polarization and substantially reflects light of a second polarization, disposed in a plane between the display module and the optical cavity, wherein the reflective polarizer transmits at least 85% of visible light of the first polarization incident normal to the plane of the reflective polarizer, transmits less than 25% of visible light of the second polarization incident normal to the plane of the reflective polarizer and has less than 8% CRMS color for visible light at an angle of at least 60 degrees from normal to the plane of the reflective polarizer, where CRMS color is defined by the relationship;
where λ
1 to λ
2 define a bandwidth for visible light, T is the transmissivity of the first polarization as a function of wavelength and {overscore (T)} is the average transmissivity of the first polarization for visible light.
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10. A display comprising:
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a light source having a reflective optical cavity configured to randomize direction and polarization of light reflected by the optical cavity;
a display module;
a geometric structured surface material disposed between the light source and the display module, the structure surface material redirecting a portion of light incident on the structured surface material from an incidence angle to a transmission angle, the transmission angle being less than the incidence angle measured from an axis normal to the plane of the display module;
a reflective polarizer disposed between the light source and the display module, the reflective polarizer having a birefringent material arranged such that light of a first polarization is substantially reflected toward the optical cavity while light of a second polarization is substantially transmitted through the reflective polarizer toward the display; and
an absorbing polarizer disposed between the reflective polarizer and the display module.
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11. A display comprising:
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a light source having a reflective optical cavity configured to randomize direction and polarization of light reflected by the optical cavity;
a display module;
a geometric structured surface material disposed between the light source and the display module, the structure surface material redirecting a portion of light incident on the structured surface material from an incidence angle to a transmission angle, the transmission angle being less than the incidence angle measured from an axis normal to the plane of the display module; and
a reflective polarizer disposed between the light source and the display module, the reflective polarizer having a birefringent material arranged such that light of a first polarization encounters changes in refractive indices, as the light of the first polarization propagates in the reflective polarizer, sufficient to reflect the light of the first polarization toward the optical cavity, while light of a second polarization is substantially transmitted through the reflective polarizer toward the display.
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Specification