See-through computer display systems
US-2024210705-A1 · Jun 27, 2024 · US
Backlighting system including a specular partial reflector and a circular-mode reflective polarizer
US9488859B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9488859-B2 |
| Application number | US-201414456830-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 11, 2014 |
| Priority date | Dec 28, 2007 |
| Publication date | Nov 8, 2016 |
| Grant date | Nov 8, 2016 |
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- Title
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Abstract
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A backlight that includes an illumination device that has at least one light source, a circular-mode reflective polarizer, and a specular partial reflector is disclosed. The specular partial reflector is disposed between the illumination device and the circular-mode reflective polarizer. Furthermore, the specular partial reflector is in substantially direct polarization communication with the circular-mode reflective polarizer.
First claim
Opening claim text (preview).
What is claimed is: 1. A backlight, comprising: an illumination device comprising at least one light source; a circular-mode reflective polarizer; and a birefringent specular partial reflector disposed between the illumination device and the circular-mode reflective polarizer, wherein the specular partial reflector has an orthogonal reflection fraction value of at least 2%; wherein the birefringent specular partial reflector is in substantially direct polarization communication with the circular-mode reflective polarizer. 2. The backlight of claim 1 , wherein the circular-mode polarizer comprises a linear-mode reflective polarizer and a retarder, wherein the retarder in conjunction with the linear-mode reflective polarizer performs conversion of linear to one of circular, near-circular, or elliptical polarization. 3. The backlight of claim 1 , wherein the birefringent specular partial reflector includes a low density surface textured film. 4. The backlight of claim 1 , wherein different polarization components of light are reflected by the specular partial reflector at different magnitudes. 5. A backlight, comprising: an illumination device comprising at least one light source; a circular-mode reflective polarizer, wherein the circular-mode polarizer comprises a linear-mode reflective polarizer and a retarder, and wherein the retarder in conjunction with the linear-mode reflective polarizer performs conversion of linear to one of circular, near-circular, or elliptical polarization; and a specular partial reflector disposed between the illumination device and the circular-mode reflective polarizer, wherein the specular partial reflector has an orthogonal reflection fraction value of at least 2%; wherein the specular partial reflector is in substantially direct polarization communication with the circular-mode reflective polarizer.
Assignees
Inventors
Classifications
with LEDs · CPC title
providing polarized light, e.g. by converting a polarisation component into another one · CPC title
Electrical device making · CPC title
Physics · mapped topic
Diffusing, scattering, diffracting elements (associated to illuminating devices G02F1/133606) · CPC title
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- What does patent US9488859B2 cover?
- A backlight that includes an illumination device that has at least one light source, a circular-mode reflective polarizer, and a specular partial reflector is disclosed. The specular partial reflector is disposed between the illumination device and the circular-mode reflective polarizer. Furthermore, the specular partial reflector is in substantially direct polarization communication with the c…
- Who is the assignee on this patent?
- 3M Innovative Properties Co
- What technology area does this patent fall under?
- Primary CPC classification G02B6/0055. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Nov 08 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).