Optical film for increasing the viewing angle of liquid crystal display devices
AssigneeFinity Labs
InventorWai-Hon Lee
Life of this patent
Estimating the term…
Abstract
Techniques and devices are disclosed to enhance or increase the viewing angle of liquid crystal display (LCD) device through the use of one or more types of optical films. Such optical films can include arrays of prism structures and/or diffractive elements that redirect light that has passed through an LCD panel. The prism structures and/or diffractive elements can be spaced on an optical film to enable at least a portion of the light travelling through the LCD panel to pass through the optical film without being redirected. Various types of prism structures and/or diffractive elements can be used, and they can be configured on the optical film differently to enable different functionality.
Claims16
A liquid crystal display (LCD) device comprising:
- a back light unit;
- a first polarizer;
- an LCD panel;
- a second polarizer;
- a transparent cover;
- and
- a film for redirecting light, the film having:
- a first refractive index,
- a plurality of prism structures for redirecting light, the plurality of prism structures located on a surface of the film and periodically spaced along at least one dimension of the prism film, and
- a plurality of areas on the surface of the film without prism structures for redirecting light;
- wherein:
- each of the plurality of prism structures has a certain width;
- a distance between each of the plurality of prism structures is greater than the certain width of the prism structure;
- and
- the film is located between the second polarizer and the transparent cover.
A liquid crystal display (LCD) device comprising:
- a back light unit;
- a first polarizer;
- an LCD panel;
- a second polarizer;
- a transparent cover;
- and
- a diffractive film having:
- a first refractive index, and
- a plurality of diffractive structures comprising a plurality of groups of diffractive structures periodically spaced along at least one dimension of the diffractive film;
- wherein:
- each group of the plurality groups of diffractive structures has a certain width;
- a distance between each group of the plurality groups of diffractive structures is greater than the certain width of the group;
- and
- the diffractive film is located between the second polarizer and the transparent cover.
A liquid crystal display (LCD) device comprising:
- a diffractive film having a plurality of groups of diffractive structures, wherein:
- the plurality of groups of diffractive structures are periodically spaced along at least one dimension of the diffractive film;
- a distance between each group of diffractive structures is greater than the width of each group;
- and
- the diffractive film is disposed in relation to an LCD panel such that, after light that travels through the LCD panel, a portion of the light is redirected by the diffractive structures of the diffractive film.
Dependencies are inferred from the claim text.