1020000036897 is referenced by 39 patents.
PURPOSE: A backlight unit of an LCD(Liquid Crystal Display) is provided to reduce the thickness of a backlight unit by not using a diffusion plate and a prism plate with keeping luminance regular. CONSTITUTION: A lamp(20) is arranged on a side of a light guide plate(21). The lamp is surrounded by a lamp reflector(22) to transmit light therefrom toward the light guide plate. The light guide plate is used instead of a diffusion plate and a prism plate. Plural reflecting patterns are formed regularly at the bottom of the light guide plate. The reflecting patterns have limit in height not to be scratched by a reflecting plate(23). Plural prisms are formed regularly on the light guide plate. An inverted prism plate(24) is formed on the light guide plate. The traveling path of light is changed at 90 degrees by the prisms integral with the light guide plate and then converted at 180 degrees by the inverted prism plate. A diffusion plate to be positioned between the light guide plate and the inverted prism plate is omitted for the light guide plate keeps desired luminance regular. A protecting plate(25) for the inverted prism plate is set on the inverted prism plate, and all of the components are supported by a mold frame(26). An LCD panel(27) is arranged on the protecting plate. The backlight unit has small thickness through omission of a diffusion plate.