Electronic device

An electronic device, comprising:

• a reflective panel;
• a light guide plate disposed on the reflective panel, wherein the light guide plate has a first surface, a second surface opposite to the first surface, and a side surface connecting between the first surface and the second surface, wherein the first surface is adjacent to the reflective panel;
• and
• a light source adjacent to the side surface,
• wherein the second surface comprises a plurality of recessed structures, one of the plurality of recessed structures has a depth in a normal direction of the reflective panel, the side surface has a thickness, and a ratio of the depth to the thickness is greater than or equal to 0.0001 and less than or equal to 0.25;
• wherein after light emitted by the light source passes through the light guide plate, a first light pattern is measured from the first surface, and a second light pattern is measured from the second surface, wherein a maximum ratio of brightness of the first light pattern to brightness of the second light pattern is located at a view angle greater than or equal to 0° and less than or equal to 40°.