Displays with elevated backlight efficiency
First Claim
1. A display, comprising:
- a liquid crystal display module;
a backlight unit having a reflector;
a prism film;
a reflective polarizer interposed between the reflector and the liquid crystal display module;
a half wave plate interposed between the reflective polarizer and the prism film; and
a uniaxial birefringent compensation film, wherein the half wave plate is interposed between the reflective polarizer and the uniaxial birefringent compensation film.
1 Assignment
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Accused Products
Abstract
An electronic device may be provided with a display mounted in a housing. The display may include a liquid crystal display module and a reflective polarizer having an in-plane optical axis. The display may also include a backlight unit that includes a light source, a light guide element, and a reflector film coupled to a backside of the light guide element. The display may also include a light retardation layer such as a quarter wave film. The quarter wave film may be arranged between the reflective polarizer and the reflector film of the backlight unit. Partially polarized light that is output from a front side of the light guide element may have a first component parallel to the in-plane optical axis and a second component perpendicular to the in-plane optical axis of the reflective polarizer. The second component may be reflected from the reflective polarizer.
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Citations
17 Claims
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1. A display, comprising:
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a liquid crystal display module; a backlight unit having a reflector; a prism film; a reflective polarizer interposed between the reflector and the liquid crystal display module; a half wave plate interposed between the reflective polarizer and the prism film; and a uniaxial birefringent compensation film, wherein the half wave plate is interposed between the reflective polarizer and the uniaxial birefringent compensation film. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A liquid crystal display, comprising:
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display layers including a liquid crystal layer and a reflective polarizer; a backlight unit having a light guide plate and a reflector, wherein the reflective polarizer is interposed between the liquid crystal layer and the reflector; a prism film; a half wave plate between the reflective polarizer and the prism film; and a uniaxial birefringent compensation film, wherein the half wave plate is interposed between the reflective polarizer and the uniaxial birefringent compensation film. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14)
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15. A display, comprising:
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an upper polarizer; a lower polarizer; display layers between the upper polarizer and the lower polarizer that include a layer of liquid crystal material and an array of pixels with rows of pixels that run parallel to a first axis and columns of pixels that run parallel to a second axis that is perpendicular to the first axis; a light guide plate that emits backlight; a half wave plate between the light guide plate and the lower polarizer; a reflective polarizer interposed between the lower polarizer and the light guide plate; a uniaxial birefringent compensation film, wherein the half wave plate is interposed between the reflective polarizer and the uniaxial birefringent compensation film; and a prism film having prism elements and a prism axis that run along a third axis that is between the first and second axes. - View Dependent Claims (16, 17)
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Specification