Low cost optical film stack
First Claim
1. A backlight assembly for a display having a polarized transmission axis comprising:
- a light source for emitting light;
a first brightness enhancement film having a plurality of prismatic elements extending in a first direction, and positioned to receive light emitted from the light source;
a second brightness enhancement film having a plurality of prismatic elements extending in a second direction; and
a diffuser positioned to receive light exiting the first brightness enhancement film, wherein light exiting the diffuser enters the second brightness enhancement film.
1 Assignment
0 Petitions
Accused Products
Abstract
A rearview assembly for a vehicle includes a housing for attachment to the vehicle, a glass element disposed in the housing and a display disposed behind the mirror element in the housing. The display contains a light source for emitting light, a first brightness enhancement film having a first plurality of prismatic elements extending in a first direction and positioned to receive light emitted from the light source, a diffuser configured to transmit about 97% of light from the first brightness enhancing film, a second brightness enhancement film having a plurality of prismatic elements extending in a second direction and positioned to receive light exiting the diffuser, and a display element disposed to receive light from the second brightness enhancement film with the display element having a second plurality of prismatic elements extending in a second direction. The first direction is substantially vertical and the second direction is substantially horizontal.
467 Citations
20 Claims
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1. A backlight assembly for a display having a polarized transmission axis comprising:
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a light source for emitting light; a first brightness enhancement film having a plurality of prismatic elements extending in a first direction, and positioned to receive light emitted from the light source; a second brightness enhancement film having a plurality of prismatic elements extending in a second direction; and a diffuser positioned to receive light exiting the first brightness enhancement film, wherein light exiting the diffuser enters the second brightness enhancement film. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A display comprising:
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a light source for emitting light; a first brightness enhancement film having a plurality of prismatic elements extending in a first direction, and positioned to receive light emitted from said light source; a second brightness enhancement film having a plurality of prismatic elements extending in a second direction and positioned to receive light exiting said first brightness enhancement film; and a diffuser having a transmissivity to light of about 97%, wherein the diffuser is disposed between the first brightness enhancing film and the second brightness enhancing film, wherein the display is configured to have a substantially uniform luminance between at least one of;
about a +30 degree viewing angle and about a +50 degree viewing angle across a horizontal axis thereof; and
about a −
30 degree viewing angle and about a −
50 degree viewing angle across a horizontal axis thereof. - View Dependent Claims (13)
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14. A rearview assembly for a vehicle comprising:
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a housing for attachment to the vehicle; a glass element disposed in said housing; and a display disposed behind said glass element in said housing, said display comprising; a light source for emitting light; a first brightness enhancement film having a first plurality of prismatic elements extending in a first direction, and positioned to receive light emitted from said light source; a diffuser configured to transmit about 97% of light from the first brightness enhancing film; a second brightness enhancement film having a second plurality of prismatic elements extending in a second direction and positioned to receive light exiting said diffuser; and a display element disposed to receive light from said second brightness enhancement film, wherein the first direction is substantially vertical and the second direction is substantially horizontal relative to the rearview assembly. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification