Backlight module and display device

A backlight module, comprising:

• a switching control unit;
• a first light source unit disposed below the switching control unit, the first light source unit comprising a first light source and a first light guide;
• a second light source unit disposed between the switching control unit and the first light source unit, the second light source unit comprising a second light source and a second light guide;
• and
• a first prism film disposed at a light exit side of the first light guide,
• wherein in a privacy mode, the second light source is turned off, the first light source is turned on, and the switching control unit is activated to modulate light passing the first prism film from the first light source unit, so the backlight module has a first light output range;
• in a share mode, the second light source is turned on, and the switching control unit is deactivated, so the backlight module has a second light output range larger than the first light output range,
• wherein the second light source comprises a first sub-light source and a second sub-light source;
• the switching control unit comprises a first modulation region and a second modulation region corresponding to the first sub-light source and the second sub-light source, respectively;
• in a partial privacy mode, the first light source is turned on, the first sub-light source is selectively turned on or off, the second sub-light source is turned off, and the switching control unit is deactivated at the first modulation region and activated at the second modulation region, so the backlight module has a third light output range substantially corresponding to the first modulation region and a fourth light output range substantially corresponding to the second modulation region;
• the fourth light output range is smaller than the third light output range.