Display module and electronic device

An electronic device, comprising a display module, wherein the display module comprises:

• an upper substrate comprising a glass plate layer, a first resin layer, a first electrode, and a plurality of protrusions arranged in a matrix at a first surface of the upper substrate;
• a lower substrate comprising a second electrode provided thereon, and a plurality of grooves arranged at the first surface of the lower substrate;
• and
• an inverted emulsion includes charged particles and uncharged liquid;
• wherein the first surface of the upper substrate is on the first surface of the lower substrate, and each of the protrusions is cooperated with a corresponding groove to form an accommodation space, and the inverted emulsion is filled in the accommodation space;
• and
• refractive indexes of the charged particles in the inverted emulsion, the first resin layer, and the uncharged liquid in the inverted emulsion are decreased sequentially.