OLED display substrate and OLED display device

1. An OLED display substrate, comprising: a plurality of pixels arranged in an array, wherein each of the pixels comprises two sub-pixels; the two sub-pixels comprise a first sub-pixel and a second sub-pixel;

the first sub-pixel comprises a first light-emitting unit and a second light-emitting unit that are stacked, wherein the first light-emitting unit comprises a first anode and a first cathode, a thickness of the first anode is 2-5 nm, a thickness of the first cathode is 100-200 nm; and the second light-emitting unit comprises a second anode and a second cathode, and a thickness of the second cathode is 5-10 nm;

the second sub-pixel comprises a third light-emitting unit; and the first light-emitting unit, the second fight-emitting unit and the third light-emitting unit are configured to emit lights of different colors, and when one of the first light-emitting unit and the second light-emitting unit is configured to emit red light, the other one of the first light-emitting unit and the second light-emitting unit is configured to emit blue light, and the third light-emitting unit is configured to emit green light, and a light-emitting area of the first sub-pixel is greater than a light-emitting area of the second sub-pixel.

2. The OLED display substrate according to claim 1 , wherein the first light-emitting unit is configured to emit red light; the second light-emitting unit and the fourth light-emitting unit are configured to emit blue light; the third light-emitting unit is configured to emit green light; and the second light-emitting unit and the fourth light-emitting unit are located at a same side of the first light-emitting unit and the third light-emitting unit.

3. The OLED display substrate according to claim 1 , wherein the second sub-pixel further comprises a fourth light-emitting unit; the fourth light-emitting unit and the third light-emitting unit are stacked; a color of light emitted by the fourth light-emitting unit is different from colors of lights emitted by the first light-emitting unit, the second light-emitting unit and the third light-emitting unit.

4. The OLED display substrate according to claim 1 , wherein one of the first light-emitting unit and the second light-emitting unit is configured to emit red light; the other one of the first light-emitting unit and the second light-emitting unit is configured to emit green light; and the third light-emitting unit is configured to emit blue light.

5. The OLEO display substrate according to claim 1 , wherein the second sub-pixel further comprises a fourth light-emitting unit; the fourth light-emitting unit and the third light-emitting unit are stacked; a color of light emitted by the fourth light-emitting unit is the same as a color of light emitted by any one of the first light-emitting units, the second light-emitting unit and the third light-emitting unit.

6. The OLED display substrate according to claim 5 , wherein one of the first light-emitting unit and the second light-emitting unit is configured to emit red light; the other one of the first light-emitting unit and the second light-emitting unit is configured to emit green light; and both the third light-emitting unit and the fourth light-emitting unit are configured to emit blue light.

7. The OLED display substrate according to claim 1 , wherein the first light-emitting unit comprises a first light-emitting layer, the first anode, the first light-emitting layer and the first cathode are successively stacked on the second light-emitting unit; and the second light-emitting unit comprises a second light-emitting layer, the second anode, the second light-emitting layer and the second cathode are successively stacked.

8. The OLED display substrate according to claim 7 , wherein the light-emitting layer for emitting green light and the light-emitting layer for emitting red light adopt phosphorescent organic light-emitting material, and the light-emitting layer for emitting blue light adopts a fluorescent light-emitting material.

9. The OLED display substrate according to claim 7 , wherein the second anode is made of a transparent conductive material; and the first cathode is made of metal.

10. The OLED display substrate according to claim 7 , wherein thicknesses of the first light-emitting layer and the second light-emitting layer are 5-200 nm.

11. The OLED display substrate according to claim 7 , wherein the first light-emitting unit and the second light-emitting unit each further comprises a hole injection layer, a hole transporting layer, an electron transporting layer and an electron injection layer; and the second anode, the hole injection layer of the second light-emitting unit, the hole transporting layer of the second light-emitting unit, the second light-emitting layer, the electron transporting layer of the second light-emitting unit, the electron injection layer of the second light-emitting unit, the second cathode, the first anode, the hole injection layer of the first light-emitting unit, the hole transporting layer of the first light-emitting unit, the first light-emitting layer, the electron transporting layer of the first light-emitting unit, the electron injection layer of the first light-emitting unit, and the first cathode are successively stacked.

12. The OLED display substrate according to claim 11 , wherein thicknesses of the hole injection layer, the hole transporting layer and the electron transporting layer are 5-200 nm, and a thickness of the electron injection layer is 0.2-50 nm.

13. The OLED display substrate according to claim 7 , wherein in the first sub-pixel, the first anode and the second cathode are stacked and connected with a same thin film transistor; and the second anode and the first cathode are connected with a same signal line.

14. The OLED display substrate according to claim 13 , further comprising a plurality of thin film transistors, wherein each of the sub-pixels is correspondingly connected to one of the thin film transistors, each of the TFTs comprises a buffer layer arranged on a base substrate, an active layer arranged on the buffer layer, a gate insulating layer arranged on the active layer, a gate electrode arranged on a predetermined region of the gate insulating layer, an intermediate insulating layer arranged on the gate electrode, and a source electrode and a drain electrode that are arranged on the intermediate insulating layer; the source electrode and the drain electrode are respectively connected with a source electrode region and a drain electrode region of the active layer through a via; an intermediate electrode of the first sub-pixel is connected with the source electrode of the thin film transistor corresponding to the first sub-pixel through a via; and the intermediate electrode is formed by stacking the first anode and the second cathode.

15. The OLED display substrate according to claim 13 , wherein the first anode is made of Ag; and the second cathode is made of Au.

16. The OLED display substrate according to claim 13 , wherein the signal line is configured to input an alternating current signal; and the frequency of the alternating current signal is not less than 30 Hz.

17. The OLED display substrate according to claim 16 , wherein the frequency of the alternating current signal is 100-120 Hz.

18. An OLED display device, comprising: an OLED display substrate comprising: a plurality of pixels arranged in an array, wherein each of the pixels comprises two sub-pixels; the two sub-pixels comprise a first sub-pixel and a second sub-pixel;

the first sub-pixel comprises a first light-emitting unit and a second light-emitting unit that are stacked, wherein the first light-emitting unit comprises a first anode and a first cathode, a thickness of the first anode is 2-5 nm, a thickness of the first cathode is 100-200 nm; and the second light-emitting unit comprises a second anode and a second cathode, and a thickness of the second cathode is 5-10 nm;

the second sub-pixel comprises a third light-emitting unit; and the first light-emitting unit, the second light-emitting unit and the third light-emitting unit are configured to emit lights of different colors, and when one of the first light-emitting unit and the second light-emitting unit is configured to emit red light, the other one of the first light-emitting unit and the second light-emitting unit is configured to emit blue light, and the third light-emitting unit is configured to emit green light, and a light-emitting area of the first sub-pixel is greater than a light-emitting area of the second sub-pixel.

19. An OLED display substrate, comprising: a plurality of pixels arranged in an array, wherein each of the pixels comprises two sub-pixels, the two sub-pixels comprise a first sub-pixel and a second sub-pixel;

the first sub-pixel comprises a first light-emitting unit and a second light-emitting unit that are stacked and have a same area; the first light-emitting unit comprises a first anode, a hole injection layer of the first light-emitting unit, a hole transporting layer of the first light-emitting unit, a first light-emitting layer, an electron transporting layer of the first light-emitting unit, an electron injection layer of the first light-emitting unit, and the first cathode that are successively stacked on the second light-emitting unit, wherein the first anode is made of Ag, a thickness of the first anode is 2-5 nm, a thickness of the first cathode is 100-200 nm; and the second light-emitting unit comprises a second anode, a hole injection layer of the second light-emitting unit, a hole transporting layer of the second light-emitting unit, a second light-emitting layer, an electron transporting layer of the second light-emitting unit, an electron injection layer of the second light-emitting unit, and a second cathode that are successively stacked, wherein the second cathode is made of Au, a thickness of the second cathode is 5-10 nm; in any one of the first sub-pixel, the first anode and the second cathode are stacked and connected with a same thin film transistor; and the second anode and the first cathode are connected with a same signal line, the signal line is configured to input an alternating current signal; and the frequency of the alternating current signal is 100-120 Hz; thicknesses of the hole injection layer, the hole transporting layer, the first light-emitting layer, the second light-emitting layer and the electron transporting layer are 5-200 nm, and a thickness of the electron injection layer is 0.2-50 nm;

the second sub-pixel comprises a third light-emitting unit and a fourth light-emitting unit that are stacked and have the same area, and a layer structure of the third light-emitting unit and the fourth light-emitting unit that are stacked, which is the same as a layer structure of the first light-emitting unit and the second light-emitting unit;

the first light-emitting unit, the second light-emitting unit, and the third light-emitting unit are configured to emit lights of different colors, and when one of the first light-emitting unit and the second light-emitting unit is configured to emit red light, the other one of the first light-emitting unit and the second light-emitting unit is configured to emit blue light, and the third light-emitting unit is configured to emit green light, and a light-emitting area of the first sub-pixel is greater than a light-emitting area of the second sub-pixel.