Display device and splicing display device

A splicing display device, comprising:

• a plurality of display devices, spliced together, wherein each of the display devices comprises:
• a substrate layer, having a first surface, a second surface opposite to the first surface, and a third surface connected to the first surface and the second surface;
• a trace layer, surrounding the first surface, the second surface and the third surface of the substrate layer in a section;
• a capping layer, disposed on the substrate layer, having a first region;
• and
• a light-emitting element, disposed on the substrate layer, emitting light toward the first region of the capping layer,
• wherein a distance from the first region to a side surface of the capping layer is defined as D, a thickness of the capping layer is defined as T, a refractive index of the capping layer is defined as n1, and D, T, and nl meet the following equation:
• Tan−1(D/T)>Sin−1(1/n1);
• wherein the first surface of the substrate layer is closer to the capping layer than the second surface, and the light-emitting element is disposed between the first surface of the substrate layer and the capping layer.

A display device, comprising:

• a substrate layer, having a first surface, a second surface opposite to the first surface, and a third surface connected to the first surface and the second surface;
• a trace layer, surrounding the first surface, the second surface and the third surface of the substrate layer in a section;
• a light-emitting element, disposed on the substrate layer;
• and
• a capping layer, disposed on the substrate layer, covering the light-emitting element;
• wherein a distance from a side surface of the light-emitting element to a side surface of the capping layer is defined as D1, a distance from a top surface of the light-emitting element to a surface of the capping layer is defined as T2, a refractive index of the capping layer is defined as n1, and D1, T2, and n1 meet the following equation:
• Tan−1(D1/T2)>Sin−1(1/n1);
• wherein the first surface of the substrate layer is closer to the capping layer than the second surface, and the light-emitting element is disposed between the first surface of the substrate layer and the capping layer.