Data processing device

A data processing device comprising:

• a display portion being foldable,
• wherein when the display portion is folded to face inward, a part of the display portion which does not face a user of the data processing device is configured to stop displaying,
• wherein the display portion comprises:
• a first substrate having flexibility;
• a first adhesive layer over the first substrate;
• a transistor over the first adhesive layer;
• an insulating layer over the transistor;
• a lower electrode of a light-emitting element over the insulating layer;
• a partition having a region overlapping with an end portion of the lower electrode;
• a layer comprising a light-emitting organic compound, the layer overlapping with the lower electrode in a region where the partition is not provided;
• an upper electrode of the light-emitting element over the layer;
• a coloring layer over the upper electrode;
• a second adhesive layer over the coloring layer;
• and
• a second substrate having flexibility over the second adhesive layer,
• wherein the light-emitting element is configured to emit light to an outside of the second substrate through the coloring layer,
• wherein a photodiode is provided below the light-emitting element so as not to overlap with the light-emitting element and a channel formation region of the transistor, and
• wherein the photodiode is located at a position where light from above the second substrate is incident without passing through the coloring layer and the partition.