Display backlight with transparent light guide

A transparent light source system for a display device, comprising:

• a light source;
• a light guide plate having an incident surface facing the light source, an upper surface, a lower surface opposite and parallel to the upper surface, and a lateral surface facing the incident surface;
• an outer light guide film is disposed over the upper surface;
• first optical micro-structures disposed on the upper surface, and configured to allow light transmitted in the light guide plate to be emitted from the upper surface;
• second optical micro-structures facing the first optical micro-structures are disposed on an inner surface of the outer light guide film, and configured to allow light emitted out of the first optical micro-structures to be emitted from an outer surface of the outer light guide film,
• wherein the first optical micro-structures are multiple first independent strip structures, which are arranged in parallel in a light transmission direction and have a width less than a minimum pixel size of a display device;
• and the second optical micro-structures are multiple second independent strip structures which are arranged in parallel in the light transmission direction and have a width less than the minimum pixel size of the display device,
• wherein the first independent strip structures are correspondingly matched with the second independent strip structures to form multiple parallel independent strip structure units, and the independent strip structure units allow the light transmitted in the light guide plate to be emitted from the outer surface of the outer light guide film,
• wherein each of the independent strip structure units is formed by one of the first independent strip structure and two of the second independent strip structures correspondingly matched with the first independent strip structure.