초록 ▼

A surface-type illumination device suitable for providing backlight in a liquid crystal display is disclosed. For example, an L-shaped fluorescent light can be used as an illuminant and mounted next to two edges of a substantially rectangular light guide plate. The corner of an edge portion between

A surface-type illumination device suitable for providing backlight in a liquid crystal display is disclosed. For example, an L-shaped fluorescent light can be used as an illuminant and mounted next to two edges of a substantially rectangular light guide plate. The corner of an edge portion between the two edges is removed. The fluorescent light, the length of whose illuminating portion is long, is positioned with an appropriate gap from the light guide plate allowing for illumination with high brightness and low power consumption. Consequently, when the illumination device is used in a color liquid crystal display, appropriate backlight with high brightness can be obtained. Moreover, because the influence of the temperature from the illumination device is small, a stable color display can be achieved.

대표청구항 ▼

[ What is claimed is:] [1.] An illumination device comprising:a substantially transparent and polygon-shaped light guide plate comprising at least first and second side edges;an elongated illuminant comprising an L-shaped section facing said at least first and second side edges of said light guide p

[ What is claimed is:] [1.] An illumination device comprising:a substantially transparent and polygon-shaped light guide plate comprising at least first and second side edges;an elongated illuminant comprising an L-shaped section facing said at least first and second side edges of said light guide plate;said light guide plate comprising a cutout portion at a corner between said first and second side edges so as not to interfere with a facing bend in said L-shaped section of said elongated illuminant;said cutout portion comprising a first leg and a second leg, said first leg being substantially parallel to said second side edge, and said second leg being substantially parallel to said first side edge.