Patent attributes
A backlight device includes a light source (21) arranged in a casing (23) opened in a light radiating surface (20a), so that the light source faces the light radiating surface (20a) and radiates light towards the light radiating surface (20a), a light transmitting reflecting plate (25) arranged in the casing for delimiting a space inclusive of the light source (21) and adapted for transmitting a fraction of the incident light and for reflecting another fraction of the incident light, and a light transmitting diffusing plate (41) arranged on the light radiating surface (20a) of the casing (23) for diffusing the light transmitted through the light transmitting reflecting plate (25) and for causing surface light radiation. A light reflecting surface (24) is formed on the inner surface of the casing (23). A portion of light radiated by the light source (21) is internally reflected by the light transmitting reflecting plate (25) and by the light reflecting surface (24), in a space delimited in the casing (23) by the light transmitting reflecting plate (25), after which the light portion is transmitted through the light transmitting reflecting plate (25).
