WOLED DISPLAY PANEL AND DISPLAY DEVICE

• US 20190013370A1
• Filed: 10/24/2017
• Published: 01/10/2019
• Est. Priority Date: 07/07/2017
• Status: Abandoned Application

• Current Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Original Assignee: Shenzhen China Star Optoelectronics Semiconductor Display Technology Co., Ltd. (TCL Technology Group Corp.)
• Inventors: Nie, Chenglei
• Application Number:
  US15/741,170
• Publication Number:
  US 20190013370A1
• Time in Patent Office: Days
• CPC Class Codes: H10K 50/131 with spacer layers between the electroluminescent layers
• CPC Class Codes: H10K 50/15 Hole transporting layers
• CPC Class Codes: H10K 50/16 Electron transporting layers
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/82 Cathodes
• CPC Class Codes: H10K 50/8428 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]
• CPC Class Codes: H10K 59/8051 Anodes
• CPC Class Codes: H10K 59/8052 Cathodes
• CPC Class Codes: H10K 59/8723 Vertical spacers, e.g. arranged between the sealing arrangement and the OLED

Abstract

The present disclosure discloses a white organic light emitting diode (WOLED) display panel, which comprises a thin film transistor (TFT) array substrate and a color filter layer and a light emitting structure layer sequentially disposed on the TFT array substrate, wherein the light emitting structure layer comprises an anode layer, a pixel defining layer, a white organic light emitting layer and a cathode layer that are sequentially disposed, wherein the pixel defining layer comprises pixel opening portions and pixel spacing portions for spacing adjacent two of the pixel opening portions, and wherein a protruding insulating post spacer is disposed on each of the pixel spacing portions, and a protruding bend portion is formed in a part of the white organic light emitting layer corresponding to and covering the post spacer. The present disclosure also discloses a display device comprising the WOLED display panel as above.

Claims

1. A white organic light emitting diode (WOLED) display panel, comprising:

a thin film transistor (TFT) array substrate; and

a color filter layer and a light emitting structure layer sequentially disposed on the TFT array substrate,

wherein the light emitting structure layer comprises an anode layer, a pixel defining layer, a white organic light emitting layer and a cathode layer that are sequentially disposed,

wherein the pixel defining layer comprises pixel opening portions and pixel spacing portions for spacing adjacent two of the pixel opening portions, and

wherein a protruding insulating post spacer is disposed on each of the pixel spacing portions, and a protruding bend portion is formed in a part of the white organic light emitting layer corresponding to and covering the post spacer.

2. The WOLED display panel of claim 1, wherein the post spacer has a trapezoid-shaped cross-section, and has an angle not less than 60°

between a side surface and a bottom surface of the post spacer.

3. The WOLED display panel of claim 1, wherein the post spacer has a rectangle-shaped or an inverted trapezoid-shaped cross-section.

4. The WOLED display panel of claim 1, wherein each of the pixel opening portions has a length H1, and each of the post spacers has a length H2, and wherein H1 ≤

H2.

5. The WOLED display panel of claim 1, wherein a top of each of the pixel spacing portions has a width D1, and each of the post spacers has a width D2, and wherein

6. The WOLED display panel of claim 1, wherein the white organic light emitting layer comprises a first common layer for transporting holes, a blue emissive layer, a green emissive layer, a red emissive layer and a second common layer for transporting electrons that are sequentially disposed.

7. The WOLED display panel of claim 6, wherein an intermediate layer is further disposed between the blue emissive layer and the green emissive layer, and has a function of transporting electrons and holes.

8. The WOLED display panel of claim 1, wherein a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel are disposed in the light emitting structure layer,

wherein each of the pixel opening portions corresponds to one of the sub-pixels, and

wherein a red photoresist, a green photoresist, a blue photoresist and a transparent unit are disposed in the color filter layer corresponding to the red sub-pixel, the green sub-pixel, blue sub-pixel and white sub-pixel, respectively.

9. The WOLED display panel of claim 8, wherein the anode layer comprises a plurality of anodes, each of the anodes corresponding to one of the sub-pixels, and

wherein the cathode layer is integrally successive to cover all sub-pixels, and all of the sub-pixels commonly use the cathode layer.

10. A display device, comprising:

a driving unit; and

a white organic light emitting diode (WOLED) display panel supplied with a driving signal from the driving unit to display images,

wherein the WOLED display panel comprises;

a thin film transistor (TFT) array substrate; and

a color filter layer and a light emitting structure layer sequentially disposed on the TFT array substrate,

wherein the light emitting structure layer comprises an anode layer, a pixel defining layer, a white organic light emitting layer and a cathode layer that are sequentially disposed,

wherein the pixel defining layer comprises pixel opening portions and pixel spacing portions for spacing adjacent two of the pixel opening portions, and

wherein a protruding insulating post spacer is disposed on each of the pixel spacing portions, and a protruding bend portion is formed in a part of the white organic light emitting layer corresponding to and covering the post spacer.

11. The display device of claim 10, wherein the post spacer has a trapezoid-shaped cross-section, and has an angle not less than 60°

between a side surface and a bottom surface of the post spacer.

12. The display device of claim 10, wherein the post spacer has a rectangle-shaped or an inverted trapezoid-shaped cross-section.

13. The display device of claim 10, wherein each of the pixel opening portions has a length H1, each of the post spacers has a length H2, and wherein H1≤

H2.

14. The display device of claim 10, wherein a top of each of the pixel spacing portions has a width D1, each of the post spacers has a width D2, and wherein

15. The display device of claim 10, wherein the white organic light emitting layer comprises a first common layer for transporting holes, a blue emissive layer, a green emissive layer, a red emissive layer and a second common layer for transporting electrons that are sequentially disposed.

16. The display device of claim 15, wherein an intermediate layer is further disposed between the blue emissive layer and the green emissive layer, and has a function of transporting electrons and holes.

17. The display device of claim 10, wherein a red sub-pixel, a green sub-pixel, a blue sub-pixel and a white sub-pixel are disposed in the light emitting structure layer,

wherein each of the pixel opening portions corresponds to one of the sub-pixels, and

wherein a red photoresist, a green photoresist, a blue photoresist and a transparent unit are disposed in the color filter layer corresponding to the red sub-pixel, the green sub-pixel, blue sub-pixel and white sub-pixel, respectively.

18. The display device of claim 17, wherein the anode layer comprises a plurality of anodes, each of the anodes corresponding to one of the sub-pixels, and

wherein the cathode layer is integrally successive to cover all sub-pixels, such that the all sub-pixels commonly use the cathode layer.