Image input/output device and image information reading method therefor

An image input/output device comprising:

• an image information detection section for receiving reflected light from an image information object to detect the image information of the object, and a self-luminous image display section for displaying an image based on the image information detected by the image information detection section are attached together in a back-to-back arrangement,
• wherein the self-luminous image display section functions as an image-information-detecting light source for irradiating an image information object with light through the image information detection section,
• wherein the image display section, which functions as the image-information-detecting light source, emits light only toward an image display side;
• and
• wherein the image input/output device further comprises light reflecting means, different than the information object, for reflecting light emitted toward the image display side from the image display section, which functions as the image-information-detecting light source, toward an image information detection side.