Organic light-emitting display apparatus

An organic light-emitting display apparatus comprising:

• a substrate;
• thin film transistors on the substrate, each comprising:
• a semiconductor active layer,
• a gate electrode on and insulated from the semiconductor active layer, and
• source and drain electrodes connected to the semiconductor active layer;
• a photo sensor positioned adjacent to each of the thin film transistors, each photo sensor comprising:
• an optical detection transistor, and
• source and drain electrodes connected to the optical detection transistor;
• a reflection layer to reflect light to the photo sensor;
• pixel electrodes connected to the thin film transistors;
• a pixel defining layer on the substrate, having apertures to expose the pixel electrodes;
• organic layers in the apertures, on the pixel electrodes;
• and
• a counter electrode on the organic layers,
• wherein when light emitted from the organic layer strikes an object contacting the organic light-emitting apparatus, at least some of said light having a first wavelength is detected by the photo sensor while at least some of said light having the first wavelength that is not initially detected by the photo sensor passes through the photo sensor to the reflection layer and is then reflected by the reflection layer back towards the photo sensor a second time for detection.

An organic light-emitting display apparatus comprising:

• a substrate;
• an encapsulating substrate facing the substrate;
• thin film transistors on the substrate;
• organic light-emitting diodes connected to the thin film transistors, to project light toward the encapsulating substrate;
• photo sensors on the substrate, adjacent to each of the thin film transistors, to detect at least some of the light having a first wavelength that is emitted by the organic light-emitting diodes and that strikes an object on the encapsulating substrate;
• and
• a reflection layer on the substrate, to reflect at least some of the light having the first wavelength that is not initially detected by the photo sensors back towards the photo sensors to be detected by the photo sensors.