Partially curved or foldable display device including recess grooves and manufacturing method therefor

A display device in which a first folding area, a first non-folding area on one side of the first folding area, and a second non-folding area on the other side of the first folding area are defined, the display device comprising:

• a first substrate;
• a second substrate disposed on the first substrate;
• a liquid crystal layer disposed between the first substrate and the second substrate;
• an upper polarization member disposed on one surface of the second substrate and spaced apart from the liquid crystal layer with the second substrate interposed therebetween;
• a driving connection film attached to the first substrate;
• and
• a driving circuit board attached to the driving connection film,
• wherein the second substrate has a first thickness, which is partially slimmed, in the first folding area,
• the second substrate has a second thickness, which is greater than the first thickness and corresponds to an original thickness of a flat display element without being slimmed, in each of the non-folding areas,
• the upper polarization member is disposed over the first non-folding area, the folding area and the second non-folding area,
• a first gap distance between one surface of the second substrate and the upper polarization member in the first folding area is greater than a second gap distance between one surface of the second substrate and the upper polarization member in each of the non-folding areas, and
• the display device is configured to be folded in the first folding area, and is configured to be unfolded in each of the non-folding areas, and
• wherein the second substrate includes a single upper recess groove recessed toward the first substrate in the first folding area, and
• wherein the first substrate includes a single lower recess groove recessed toward the second substrate in the first folding area, and
• wherein the single upper recess groove completely overlaps the single lower recess groove in a thickness direction of the first substrate, and
• wherein the single upper recess groove and the single lower recess groove are not located in the non-folding areas, and
• wherein the driving connection film is not disposed in the first folding area, but the first non-folding area and the second non-folding area.