Backlight module with detachable light source unit and liquid crystal display device having the same

A liquid crystal display device with a backlight module, said liquid crystal display device comprising:

• a liquid crystal display panel housed in a module case;
• a light guide plate housed in said module case so as to be located behind said liquid crystal display panel, said light guide plate having an elongated edge portion for a light incident surface between a pair of principal surfaces thereof;
• a light source unit incorporated in said module case interchangeably so as to slide along a lengthwise direction of said edge portion of said light guide plate, said light source unit comprising a cover member provided with a first protruded portion, said cover member being for holding a plurality of point light sources along said lengthwise direction, a side member of said module case comprising a front side member and a rear side member provided with a second protruded portion and arranged in parallel to said principal surfaces of said light guide plate, and being united together with a side wall member;
• and
• a coupling member enabling to change a positional relationship between said light guide plate and said light source unit, said coupling member having such a structure that a first distance between a light emitting surface of said point light source and said optical incident plane at a time of interchanging said light source unit is larger than a second distance between said light emitting surface of said point light source and said optical incident plane at a time of settled in a home position of said light source unit within said module case.

A backlight module, comprising:

• a light guide plate housed in a module case, said light guide plate comprising an elongated edge portion for a light incident surface between a pair of principal surfaces thereof;
• and
• a light source unit incorporated in said module case interchangeably so as to slide along a lengthwise direction of said edge portion of said light guide plate, said light source unit comprising a cover member provided with a first protruded portion, said cover member being for holding a plurality of point light sources along said lengthwise direction, a side member of said module case comprising a front side member and a rear side member provided with a second protruded portion, the rear side member being arranged in parallel to said principal surfaces of said light guide plate, and being united together with a side wall member,
• wherein a point light source of said plurality of point light sources is fitted at a home position, and the first protruded portion is pushing the rear side member while the first protruded portion is pushing the cover member, thereby closely arranging the light emitting surface of the point light source and the optical incident plane of the light guide plate.