Multi-mode scanning device performing flatbed scanning

A multi-mode scanning device for scanning an original, the multi-mode scanning device comprising:

• a background element;
• a transparent platen supporting the original such that the original is disposed between the transparent platen and the background element;
• a first light source outputting visible light to irradiate the background element and the original to generate first light and second light, respectively;
• a second light source outputting invisible light to irradiate a combination of the background element and the original to generate third light and fourth light;
• and
• an optical module being movably disposed, and receiving the first light, the second light, the third light and the fourth light to generate sensing signals, and thus to obtain visible light information and invisible light information representative of the original according to the sensing signals, wherein the original is disposed between the background element and the optical module, the first light source and the optical module are disposed on a same side of the background element, and the optical module and the second light source are disposed on different sides of the background element.