Video display device, backlight unit, and electronic device

A backlight unit comprising:

• a light guide comprising a first edge parallel to each other;
• a first light emitting unit facing the first edge, positioned along the first edge, comprising a first terminal and a second terminal, and not being a plane symmetric with respect to a plane parallel to a display screen;
• a second light emitting unit facing the first edge, positioned along the first edge, comprising a third terminal and a fourth terminal, and not being a plane symmetric with respect to a plane parallel to the display screen, wherein
• the second terminal and the third terminal are positioned closer to each other, and
• the first terminal and the fourth terminal are positioned farther from each other;
• a third light emitting unit facing the second edge, positioned along the second edge, comprising a fifth terminal and a sixth terminal, and not being plane symmetric with respect to a plane parallel to the display screen;
• and
• a fourth light emitting unit facing the second edge, positioned along the second edge, comprising a seventh terminal and an eighth terminal, and not being plane symmetric with respect to a parallel to the display screen, wherein
• the sixth terminal and the seventh terminal are positioned closer to each other, and
• the fifth terminal and the eight terminal are positioned farther from each other, wherein
• a shape of the first light unit and a shape of the fourth light emitting unit are identical to each other,
• the shape of the first light emitting unit and a shape of the second light emitting unit are different from each other,
• the shape of the second light emitting unit and a shape of the third light emitting unit are identical to each other,
• the first light emitting unit opposes the third light emitting unit, and
• the second light emitting unit opposes the fourth light emitting unit.

An electronic device comprising:

• a housing;
• a display module comprising a display screen, the display module configured to be at least partly housed in the housing;
• a light guide located opposite the display screen with respect to the display module, and comprising a first edge and a second edge parallel to each other;
• a first light emitting unit facing the first edge, positioned along the first edge, and comprising a first terminal and a second terminal;
• a second light emitting unit facing the first edge, positioned along the first edge, and comprising a third terminal and a fourth terminal, wherein
• the second terminal and the third terminal are positioned closer to each other, and
• the first terminal and the fourth terminal are positioned farther from each other;
• and
• a third light emitting unit facing the second edge, positioned along the second edge, and comprising a fifth terminal and a sixth terminal;
• a fourth light emitting unit facing the second edge, positioned along the second edge, and comprising a seventh terminal and an eighth terminal, wherein
• the sixth terminal and the seventh terminal are positioned closer to each other, and
• the fifth terminal and the eight terminal are positioned farther from each other, wherein
• the first light emitting unit is replaceable with the fourth light emitting unit,
• the first light emitting unit is unreplaceable with the second light emitting unit,
• the second light emitting unit is replaceable with the third light emitting unit,
• the first light emitting unit opposes the third light emitting unit, and
• the second light emitting unit opposes the fourth light emitting unit.