Liquid crystal display with backlight
First Claim
1. A display, comprising:
- display layers forming an array of pixels, wherein the display layers include a reflective polarizer; and
backlight structures that provide backlight illumination for the pixels, wherein the backlight structures include;
a light guide layer;
a light collimating film interposed between the light guide layer and the reflective polarizer;
a half wave plate interposed between the light collimating film and the reflective polarizer;
a backlight reflector; and
a quarter wave plate interposed between the backlight reflector and the light guide layer.
1 Assignment
0 Petitions
Accused Products
Abstract
A display may have an array of pixels that display images for a user. The backlight unit may have a light-guide layer. An array of light-emitting diodes may emit light into an edge of the light-guide layer. The light guide layer may overlap a backlight reflector. A quarter wave plate may be interposed between the light guide layer and the backlight reflector. A turning film may be interposed between a lower polarizer in the array of pixels and the light guide layer. The lower polarizer may be a reflective polarizer. Light exiting the upper surface of the turning film may have a dominant polarization. A half wave plate may be used to rotate the dominant polarization into alignment with a pass axis of the reflective polarizer.
24 Citations
19 Claims
-
1. A display, comprising:
-
display layers forming an array of pixels, wherein the display layers include a reflective polarizer; and backlight structures that provide backlight illumination for the pixels, wherein the backlight structures include; a light guide layer; a light collimating film interposed between the light guide layer and the reflective polarizer; a half wave plate interposed between the light collimating film and the reflective polarizer; a backlight reflector; and a quarter wave plate interposed between the backlight reflector and the light guide layer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
-
-
12. A display, comprising:
-
display layers forming an array of pixels, wherein the display layers include a polarizer; and backlight structures that provide backlight illumination for the pixels, wherein the backlight structures include; a light guide layer into which light is provided by light-emitting diodes; a light collimating film interposed between the light guide layer and the polarizer; a half wave plate interposed between the light collimating film and the polarizer; a backlight reflector; and a quarter wave plate interposed between the backlight reflector and the light guide layer. - View Dependent Claims (13, 14, 15, 16, 17)
-
-
18. A backlight for a liquid crystal display having a layer of liquid crystal material sandwiched between an upper polarizer and a lower polarizer, wherein the lower polarizer is a reflective polarizer having a pass axis, the backlight comprising:
-
a light guide layer into which light is emitted by light-emitting diodes; a light collimating film interposed between the light guide layer and the reflective polarizer; a half wave plate interposed between the light collimating film and the polarizer; a backlight reflector; and a quarter wave plate interposed between the backlight reflector and the light guide layer. - View Dependent Claims (19)
-
Specification