BACKLIGHT DEVICE, LIQUID CRYSTAL DISPLAY DEVICE USING BACKLIGHT DEVICE, AND LIGHT EMITTING DIODE USED FOR BACKLIGHT DEVICE AND LIQUID CRYSTAL DISPLAY DEVICE

摘要

A backlight device is provided with: a light-emitting layer (14) that is formed on a transparent substrate (11) and emits a light with a specific wave length; a first reflection layer (17) that is formed on the light emission-side of the light-emitting layer (14) and functions to reflect the light emitted by the light-emitting layer (14); and a second reflection layer (18) that is formed on the substrate (11)-side so that the light-emitting layer (14) is interposed between the first reflection layer (17) and the second reflection layer (18). A light diffusion layer (21) for diffusing light emitted from the light-emitting layer (14) is positioned between the first reflection layer (17) and the second reflection layer (18). The second reflection layer (18) includes: a high reflectance metal layer which comprises a metal film with high reflectivity; a low-refractive-index layer which comprises a material film having a low refractive index; and a multilayer-film reflection layer formed by lamination of material films with differing reflectance rates.