Display panel and display device
The disclosure discloses a display panel and a display device to thereby extend an area for recognizing a fingerprint or a palmprint instead of only a fixed area in which a fingerprint can be recognized as in the related art, so as to recognize a fingerprint or a palmprint throughout the screen while improving the precision of recognizing light rays. The display panel according to the disclosure includes: a base substrate; and, infrared light sources, pixel units, and infrared photosensitive sensors on the base substrate.
1. A display panel, comprising:
a base substrate;
a plurality of pixel units on the base substrate; and
a plurality of infrared light sources and a plurality of infrared photosensitive sensors distributed between the plurality of pixel units;
wherein
the plurality of infrared light sources comprise near infrared organic light-emitting diodes, and the plurality of infrared photosensitive sensors comprise near infrared photosensitive diodes; and
the near infrared photosensitive diodes each is located right below each of the near infrared organic light-emitting diodes, in a direction from the base substrate to the near infrared photosensitive diodes; and wherein an area of orthographic projection of each near infrared photosensitive diode onto the base substrate is greater than an area of orthographic projection of each near infrared organic light-emitting diode onto the base substrate;
wherein an overlapping spectrum exists between an emission spectrum of each of the plurality of infrared light sources, and an absorption spectrum of each of the plurality of infrared photosensitive sensors.
2. The display panel according to claim 1 , wherein the plurality of pixel units comprise a plurality of organic light-emitting sub-pixels.
3. The display panel according to claim 2 , wherein each of the near infrared organic light-emitting diodes comprises a first electrode, a near infrared light-emitting layer, and a second electrode stacked on the base substrate in that order;
each of the plurality of organic light-emitting sub-pixels comprises a third electrode, a pixel light-emitting layer, and a fourth electrode stacked on the base substrate in that order; and
the first electrode is arranged at a same layer as the third electrode, and the second electrode is arranged at a same layer as the fourth electrode.
4. The display panel according to claim 3 , wherein the second electrode is formed integrally with the fourth electrode.
5. The display panel according to claim 1 , wherein each of the near infrared photosensitive diodes comprises a fifth electrode, a near infrared photosensitive layer, and a sixth electrode stacked on the base substrate in that order; each of the near infrared organic light-emitting diodes comprises a first electrode, a near infrared light-emitting layer, and a second electrode stacked on the base substrate in that order.
6. The display panel according to claim 1 , wherein the plurality of infrared light sources are distributed uniformly among the plurality of pixel units; and the plurality of infrared photosensitive sensors are distributed uniformly among the plurality of pixel units.
7. The display panel according to claim 6 , wherein a number of infrared photosensitive sensors is same as a number of infrared light sources.
8. The display panel according to claim 1 , wherein the base substrate is a flexible substrate.
9. The display panel according to claim 1 , wherein an emission spectrum of each of the near infrared organic light-emitting diodes ranges from 780 nm to 2500 nm.
10. The display panel according to claim 1 , wherein the display panel further comprises:
a plurality of Thin Film Transistors (TFTs) on the display substrate to drive the near infrared organic light-emitting diodes, the near infrared photosensitive diodes and the plurality of pixel units;
wherein the plurality of TFTs comprises: first TFTs to drive the near infrared organic light-emitting diodes, second TFTs to drive the near infrared photosensitive diodes and third TFTs to drive the plurality of pixel units.
11. The display panel according to claim 10 , wherein
each of the near infrared organic light-emitting diodes comprises a first electrode, a near infrared light-emitting layer, and a second electrode stacked on the display substrate in that order;
each of the near infrared photosensitive diodes comprises a third electrode, a near infrared photosensitive layer, and a fourth electrode stacked on the display substrate in that order; and
the first electrode of each of the near infrared organic light-emitting diodes is electrically connected with a drain of a corresponding first TFT; the third electrode of each of the near infrared photosensitive diodes is electrically connected with a gate of a corresponding second TFT.
12. The display panel according to claim 10 , wherein each of the near infrared photosensitive diodes comprises a third electrode, a near infrared photosensitive layer, and a fourth electrode stacked on the display substrate in that order;
each of the near infrared organic light-emitting diodes comprises a first electrode, a near infrared light-emitting layer, and a second electrode stacked on the fourth electrode in that order; and
orthographic projections of respective near infrared photosensitive layers onto the base substrate cover orthographic projections of respective near infrared light-emitting layers onto the base substrate.
13. A display device, comprising a display panel; wherein the display panel comprises:
a base substrate;
a plurality of pixel units on the base substrate; and
a plurality of infrared light sources and a plurality of infrared photosensitive sensors distributed between the plurality of pixel units;
wherein
the plurality of infrared light sources comprise near infrared organic light-emitting diodes, and the plurality of infrared photosensitive sensors comprise near infrared photosensitive diodes; and
the near infrared photosensitive diodes each is located right below each of the near infrared organic light-emitting diodes, in a direction from the base substrate to the near infrared photosensitive diodes; and wherein an area of orthographic projection of each near infrared photosensitive diode onto the base substrate is greater than an area of orthographic projection of each near infrared organic light-emitting diode onto the base substrate;
wherein an overlapping spectrum exists between an emission spectrum of each of the plurality of infrared light sources, and an absorption spectrum of each of the plurality of infrared photosensitive sensors.