Polarization separating film and illumination apparatus for display device using the polarization separating film

Abstract

A polarization separating film is provided, including an isotropic layer having a refractive index which is the same with respect to light having a first polarization and with respect to light having a second polarization, perpendicular to the first polarization; an anisotropic layer disposed on an upper surface of the isotropic layer and having a first refractive index with respect to light having the first polarization and a second refractive index, different from the first refractive index, with respect to light having the second polarization; a first micropattern disposed on a lower surface of the isotropic layer which changes an optical path of incident light; and a second micropattern, disposed on an interface between the isotropic layer and the anisotropic layer, which totally reflects light having the first polarization and which transmits light having the second polarization.

Description

technical field [0001] The present invention relates to a polarization separation film and an illuminating device for a display device using the polarization separation film, and more particularly, relates to transmitting light only in a specific polarization direction of light emitted from a light guide plate, and at the same time guiding light emitted from the light guide plate in a vertical direction. A polarization separation film for emitted light, and an illumination device for a display device using the polarization separation film. Background technique [0002] Display devices are classified into an emissive type that forms an image by emitting light and a non-emissive type that forms an image by receiving light from the outside. For example, a liquid crystal display device is a non-emissive display device, and thus requires an illumination device such as a backlight that functions as a separate light source. However, a typical liquid crystal display device forms an...

AI Technical Summary

Problems solved by technology

However, since the usual polarization separation film is manufactured by depositing and elongating hundreds of polymer layers or by vacuum deposition to form a thin film coated as a multilayer film, the manufacturing process is complex and costly.

Therefore, the general lighting device 10 shown in FIG. 1 is expensive to manufacture and has limited light utilization efficiency.

Images