Display panel and rollable display device

A display panel, comprising:

• a first substrate and a second substrate opposite to the first substrate, wherein the second substrate comprises a light guide layer and a polarizing layer, the light guide layer has a first surface and a second surface, the first surface is close to the first substrate, and the polarizing layer is disposed on the first surface of the light guide layer;
• a display material layer, disposed between the first substrate and the second substrate;
• an active component layer and a color filter layer, disposed between the first substrate and the display material layer;
• and
• a light source, disposed on one side of the second substrate, wherein the light source is configured to emit light;
• wherein the light passes through the second substrate and the color filter layer and arrives at the first substrate, and is reflected by the first substrate and enters the color filter layer;
• the light further passes through the color filter layer, enters the display material layer, passes through the display material layer and is outputted to an exterior.