Display device and touch input system including the same

1. A display device comprising:

a display unit comprising a plurality of light-emitting areas emitting light;

a touch sensing unit disposed on the display unit to sense a touch;

a buffer part disposed on the touch sensing unit to cushion an external impact; and

a metal pattern disposed on the buffer part, the metal pattern having a mesh structure,

wherein the metal pattern comprises a plurality of code patterns, each of the plurality of code patterns having a cut shape that encodes position information.

2. The display device of claim 1 , wherein the metal pattern is floating by being electrically independent.

3. The display device of claim 1 , wherein the metal pattern reduces scattering and absorption of visible light, infrared light and ultraviolet light and is identifiable using the visible light, the infrared light or the ultraviolet light.

4. The display device of claim 1 , wherein the metal pattern is blackened to reduce reflection of external light.

5. The display device of claim 1 , wherein a line width of the metal pattern is in a range of about 3 μm or less, and a pitch of the metal pattern is in a range of about 500 μm or less.

6. The display device of claim 1 , wherein:

the metal pattern comprises a first metal pattern extending in a first direction and a second metal pattern intersecting the first metal pattern, the first and second metal patterns having first and second angles therebetween, the first and second angles are adjacent to each other,

wherein the first angle is greater than the second angle.

7. The display device of claim 1 , wherein the metal pattern comprises a single layer disposed on the buffer part.

8. The display device of claim 1 , wherein the metal pattern further comprises:

a reference point serving as a basis for identification of the plurality of code patterns;

a first reference line extending from the reference point in a first direction; and

a second reference line extending from the reference point in a second direction intersecting the first direction; and

the plurality of code patterns are disposed in an area defined by the first reference line and the second reference line.

9. The display device of claim 8 , wherein the reference point comprises an area in which the metal pattern is absent at an intersection point of the metal pattern.

10. The display device of claim 8 , wherein the first reference line is defined by connecting a plurality of adjacent intersection points disposed in the first direction of the reference point.

11. The display device of claim 8 , wherein the second reference line is defined by connecting at least one plurality of adjacent intersection points disposed in the second direction of the reference point and at least one cut part disposed between the at least one adjacent intersection points.

12. The display device of claim 8 , wherein:

each of the plurality of code patterns is provided by an absence of one stem among a plurality of stems extending from an intersection point of the metal pattern; and

a direction in which the one stem is absent corresponds to a value of a preset data code constituting the position information.

13. The display device of claim 8 , wherein:

the metal pattern comprises a first metal pattern and a second metal pattern intersecting each other in first to fourth directions;

a first code pattern of the plurality of code patterns comprise a conductive pattern having a plurality of stems extending from an intersection point between the first and second metal patterns, the plurality of stems extend in the first to fourth directions in the first code pattern, and

the first code pattern encodes a null value.

14. The display device of claim 1 , wherein a modulus of the buffer part is lower than a modulus of each of the display unit and the touch sensing unit.