Display device

A display device comprising:

• a substrate having a display region and a non-display region;
• and
• a plurality of pixels in the display region of the substrate, each of the pixels comprising first and second sub-pixels, each of the first and second sub-pixels having a light emitting region for emitting light,
• wherein the first sub-pixel comprises a first light emitting element in the light emitting region, the first light emitting element being configured to emit visible light,
• wherein the second sub-pixel comprises:
• a second light emitting element in the light emitting region, the second light emitting element being configured to emit infrared light;
• and
• a light receiving element configured to receive the infrared light emitted from the second light emitting element to detect a user's touch,
• wherein the second light emitting element and the light receiving element in the second sub-pixel are electrically insulated from and optically coupled to each other to form a photo-coupler, and
• wherein the second light emitting element comprises a rod-like light emitting diode configured to emit the infrared light, and the light receiving element comprises a photo diode configured to receive the infrared light.

A display device comprising:

• a substrate having a display region and a non-display region;
• a plurality of pixels in the display region of the substrate, each of the pixels comprising first to fourth sub-pixels, each of the first to fourth sub-pixels having a light emitting region for emitting light, each of the first to third sub-pixels comprising a first light emitting element in the corresponding light emitting region and configured to emit visible light, the fourth sub-pixel comprising a second light emitting element in the light emitting region and configured to emit infrared light and a light receiving element configured to receive the infrared light emitted from the second light emitting element to detect a user's touch;
• an insulation layer on the first light emitting element, the second light emitting element, and the light receiving element;
• and
• a light blocking pattern on the insulation layer in the fourth sub-pixel and having a first opening exposing a portion of the insulation layer corresponding to the second light emitting element and a second opening exposing a portion of the insulation layer corresponding to the light receiving element,
• wherein the second light emitting element and the light receiving element are electrically insulated from and optically coupled to each other to form a photo-coupler.