Display device

A display device comprising:

• a display member which displays an image;
• and
• a light source which provides a light to the display member,
• wherein the display member comprises:
• a first base substrate comprising a front surface, a rear surface, and a plurality of side surfaces which connects the front surface to the rear surface, wherein the light source face a side surface of the side surfaces, the first base substrate receives the light from the light source through the side surface of the side surfaces, and the first base substrate has a first refractive index;
• a low refractive layer disposed on the front surface of the first base substrate and having a second refractive index less than the first refractive index;
• and
• an array layer disposed on the low refractive layer and comprising at least one thin film transistor,
• wherein the low refractive layer has a predetermined thickness, which is greater than a penetration depth of a light incident to the low refractive layer in the low refractive layer.