Importance

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Abstract

A back light device of a liquid crystal display device includes fluorescent tubes on both ends of a light guiding plate. When viewed from a section which is perpendicular to the fluorescent tubes, shapes or internal constitution of the light guiding plate are asymmetrical in order to prevent irregularity of the luminance of a display area of a liquid crystal display panel caused by, e.g., a different in optical characteristics between the fluorescent tubes, a difference between positioning of each fluorescent tubes and the light guiding plate. In other words, a border of the shapes or of the internal constitution of the light guiding plate is set in a position that is nearer to the section where a quantity of incident light is relatively small according to a ratio of the quantities of incident lights on each section obtained by cutting a face that intersect a circumferential end of the display area on the light guiding plate at right angels. As a result, the display area on the liquid crystal display panel is prevented from becoming dark on the section side where a quantity of incident light is smaller.

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First Claim