Display panel and display device including cathode set

1. A display panel, comprising a transparent display region and a non-transparent display region, wherein

the display panel comprises at least a first cathode and a second cathode;

the first cathode is in the transparent display region;

the second cathode is in the non-transparent display region;

a first work function of the first cathode is greater than a second work function of the second cathode; and

the first work function of the first cathode and the second working function of the second cathode are respectively in a range from 3.8 eV to 4.1 eV.

2. The display panel of claim 1 , wherein the first cathode and the second cathode contain magnesium and silver; and

a first volume percentage of the magnesium in the first cathode is in a range from 10% to 20%; and a second volume percentage of the magnesium in the second cathode is in a range from 8% to 20%.

3. The display panel of claim 2 , wherein the second volume percentage of the magnesium in the second cathode is 10%.

4. The display panel of claim 2 , wherein a first thickness of the first cathode is less than a second thickness of the second cathode; and

the first thickness of the first cathode is in a range from 50 Å to 100 Å, and the second thickness of the second cathode is in a range from 100 Å to 145 Å.

5. The display panel of claim 4 , wherein the first thickness of the first cathode is in a range from 60 Å to 90 Å; and the second thickness of the second cathode is in a range from 110 Å to 130 Å.

6. The display panel of claim 1 , wherein the first cathode contains aluminum and silver, and the second cathode contains magnesium and silver; and

a third volume percentage of the aluminum in the first cathode is in a range from 2% to 12%, and a second volume percentage of the magnesium in the second cathode is in a range from 8% to 20%.

7. The display panel of claim 6 , wherein the third volume percentage of the aluminum in the first cathode is in a range from 2% to 6%, and the second volume percentage of the magnesium in the second cathode is 10%.

8. The display panel of claim 6 , wherein a first thickness of the first cathode is less than a second thickness of the second cathode; and

the first thickness of the first cathode is in a range from 40 Å to 100 Å; and the second thickness of the second cathode is in a range from 100 Å to 145 Å.

9. The display panel of claim 8 , wherein the first thickness of the first cathode is in a range from 70 Å to 90 Å; and the second thickness of the second cathode is in a range from 110 Å to 130 Å.

10. The display panel of claim 1 , wherein the first cathode contains magnesium, aluminum and silver, and the second cathode contains magnesium and silver; and

a first volume percentage of the magnesium in the first cathode is in a range from 5% to 10%; a third volume percentage of the aluminum in the first cathode is in a range from 1% to 6%; and a second volume percentage of the magnesium in the second cathode is in a range from 8% to 20%.

11. The display panel of claim 10 , wherein the third volume percentage of the aluminum in the first cathode is in a range from 1% to 3%; and the second volume percentage of the magnesium in the second cathode is 10%.

12. The display panel of claim 1 , further comprising a transition region disposed between the transparent display region and the non-transparent display region, wherein

the display panel further comprises a third cathode; the third cathode is in the transition region; and a material and a third thickness of the third cathode are identical to a material and a second thickness of the second cathode respectively.

13. The display panel of claim 1 , further comprising a first anode and a second anode, wherein

the first anode is in the transparent display region; the second anode is in the non-transparent display region; the first anode is a light-transmitting anode; the second anode is a reflective anode; and the reflective anode comprises a light-transmitting layer and a reflective layer.

14. The display panel of claim 13 , wherein a fourth work function of the light-transmitting anode ranges from 4.4 eV to 5 eV, and a fifth work function of the light-transmitting layer ranges from 4.4 eV to 5 eV.

15. The display panel of claim 13 , wherein a reflectivity of the reflective anode ranges from 90% to 100%.

16. The display panel of claim 13 , further comprising a transition region disposed between the transparent display region and the non-transparent display region, and a third cathode, wherein

the third cathode is in the transition region, and a material of the third cathode is identical to a material of the second cathode.

17. The display panel of claim 13 , further comprising a first OLED light-emitting material layer and a second OLED light-emitting material layer, wherein

the first OLED light-emitting material layer is in the transparent display region, and the second OLED light-emitting material layer is in the non-transparent display region;

the first OLED light-emitting material layer is disposed between the first cathode and the first anode; and

the second OLED light-emitting material layer is disposed between the second cathode and the second anode.

18. The display panel of claim 16 , further comprising a third OLED light-emitting material layer, wherein

the third OLED light-emitting material layer is in the transition region, and

the third OLED light-emitting material layer is disposed between the third cathode and a third anode.

19. A display device, comprising:

a device body having a device region; and

the display panel of claim 1 , the display panel covering the device body;

wherein the device region is disposed under the transparent display region of the display panel, and a photosensitive device emitting or receiving light through the transparent display region is disposed in the device region.

20. The display panel of claim 1 , further comprising a first anode, a second anode, a first OLED light-emitting material layer, and a second OLED light-emitting material layer, wherein

the first anode is in the transparent display region, and the second anode is in the non-transparent display region;

the first OLED light-emitting material layer is in the transparent display region, and the second OLED light-emitting material layer is in the non-transparent display region;

the first OLED light-emitting material layer is disposed between the first cathode and the first anode; and

the second OLED light-emitting material layer is disposed between the second cathode and the second anode.