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.

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.

Abstract: A back light module where one of the top and bottom surfaces of the light guide contain a micro Fresnel lens array which is off-axis so that a portion of the light won't initially escape from the back light module. The light is reflected down the length of the light guide, spreading the light across the back light module. In one embodiment, the Fresnel lens array is designed to have its efficiency vary across the back light. A smaller percentage of the light is directed out of the module near the light source, with most of the light being directed down the light guide. In an LED embodiment, the LED is mounted on the top or bottom edge of the light guide with a diffraction structure on the opposite side to diffract the light down the light guide.