초록 ▼

A liquid crystal display unit using a back light uses a light guiding sheet to transfer to a liquid crystal display panel the light from a light source, and provides a liquid crystal display unit where a display of images is obtained with uniform brightness and high brightness. The light guiding she

A liquid crystal display unit using a back light uses a light guiding sheet to transfer to a liquid crystal display panel the light from a light source, and provides a liquid crystal display unit where a display of images is obtained with uniform brightness and high brightness. The light guiding sheet is formed by stacking two or more kinds of transparent amorphous layers different in refractive index at a predetermined angle with respect to a sheet surface. This light guiding sheet is constructed so as to be employed in a back light.

대표청구항 ▼

[ We claim:] [1.] A back light, comprising:a stack of two or more kinds of transparent amorphous layers having different refractive indices, said stack having two opposed major surfaces formed by the side surfaces of said amorphous layer and said transparent amorphous layers being inclined at a pred

[ We claim:] [1.] A back light, comprising:a stack of two or more kinds of transparent amorphous layers having different refractive indices, said stack having two opposed major surfaces formed by the side surfaces of said amorphous layer and said transparent amorphous layers being inclined at a predetermined angle with respect to one of said major surfaces; andmeans for bringing light into said stack for transmission of said light in a longitudinal direction of said stack along and between said major surfaces in a direction that intersects a multiplicity of successive ones of said transparent amorphous layers, said light being partly transmitted through a multiplicity of successive interfaces between said transparent amorphous layers and partly reflected at each of said successive interfaces in order to distribute reflected light along said stack, said light having a P-polarized component and an S-polarized component, said reflected light at said successive interfaces being emitted through one of said major surfaces and being a reflected portion of the S-polarized component, said transmitted light at each of said successive interfaces being a transmitted portion of the S-polarized component and the P-polarized component.