Display panel having a top surface of the conductive layer coplanar with a top surface of the pixel define layer

• US 9,825,256 B2
• Filed: 05/27/2014
• Issued: 11/21/2017
• Est. Priority Date: 12/12/2013
• Status: Active Grant

• Current Assignee: BOE Technology Group Co., Ltd.
• Original Assignee: BOE Technology Group Co., Ltd.
• Inventors: Qi, Yonglian, Shu, Shi
• Primary Examiner(s): Le, Thao X
• Assistant Examiner(s): SWAN, GARDNER W.S
• Application Number:
  US14/429,372
• Publication Number:
  US 20160036005A1
• Time in Patent Office: 1,274 Days
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/85 Arrangements for extracting light from the devices
• CPC Class Codes: H10K 50/865 comprising light absorbing layers, e.g. light-blocking layers
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/123 Connection of the pixel electrodes to the thin film transistors [TFT]
• CPC Class Codes: H10K 59/38 comprising colour filters or colour changing media [CCM]

Abstract

The present invention relates to the field of display technology, and particularly to a display panel and a display device comprising the display panel. The display panel comprises a substrate, which is divided into a plurality of sub-pixel areas, each of which comprises a thin film transistor and an organic light-emitting diode device provided above the thin film transistor, wherein, a pixel define layer and a conductive layer are provided above the thin film transistor and below the organic light-emitting diode device, the pixel define layer is used for defining a light-transmissive region and a non-light-transmissive region of the sub-pixel area, an upper surface of the conductive layer and an upper surface of the pixel define layer are in the same plane, and the conductive layer is electrically connected to a drain of the thin film transistor.

Claims

1. A display panel, comprising a substrate, which is divided into a plurality of sub-pixel areas, each of which comprises a thin film transistor and an organic light-emitting diode device provided above the thin film transistor, wherein, a pixel define layer and a conductive layer are provided above the thin film transistor and below the organic light-emitting diode device, the pixel define layer is used for defining a light-transmissive region and a non-light-transmissive region of the sub-pixel area, an upper surface of the conductive layer and an upper surface of the pixel define layer are in a same plane, and the conductive layer is electrically connected to a drain of the thin film transistor;

and

a color filter layer is provided above the thin film transistor and below both the conductive layer and the pixel define layer, and a first via hole is formed in a part of the color filter layer corresponding to the drain of the thin film transistor so that the conductive layer is electrically connected to the drain of the thin film transistor through the first via hole, the pixel define layer and the conductive layer are provided directly on the color filter layer and have substantially a same thickness throughout a cross section of the color filter layer, and the conductive layer is made of a conductive resin.

2. The display panel according to claim 1, wherein the conductive layer has a light transmittance larger than or equal to 95% and a surface resistance in the range of 45 Ω

/sq to 90 Ω

/sq.

3. The display panel according to claim 2, wherein the conductive resin comprises resin, and conductive particles, photo-initiator, monomer, dispersant and surfactant which are uniformly distributed in the resin, and the conductive particles comprise nanoscale SnO₂ doped with antimony, nanoscale ITO or uniformly dispersed nano-silver solution.

4. The display panel according to claim 3, wherein the pixel define layer is formed by using a patterning process, and the conductive layer is formed by way of ink-jetting by taking the pixel define layer as a barricade.

5. The display panel according to claim 1, wherein, in the sub-pixel area, a passivation layer is provided above the thin film transistor and below the color filter layer, a second via hole is formed in a part of the passivation layer corresponding to the drain of the thin film transistor, and axes of the second via hole and the first via hole coincide with each other so that the conductive layer is electrically connected to the drain of the thin film transistor through the first via hole and the second via hole.

6. The display panel according to claim 5, wherein, a black matrix is provided above the passivation layer and below the color filter layer, and the black matrix is at least partially overlapped with a source and the drain of the thin film transistor in an orthographic projection direction, respectively.

7. The display panel according to claim 1, wherein, in the sub-pixel area, the conductive layer serves as an electrode of the organic light-emitting diode device, and the organic light-emitting diode device further comprises a light-emitting layer formed above the conductive layer and another electrode formed above the light-emitting layer.

8. The display panel according to claim 6, wherein, in the sub-pixel area, the conductive layer serves as an electrode of the organic light-emitting diode device, and the organic light-emitting diode device further comprises a light-emitting layer formed above the conductive layer and another electrode formed above the light-emitting layer.

9. The display panel according to claim 8, wherein, each of the passivation layer, the black matrix and the color filter layer is formed by a patterning process.

10. A display device, comprising a display panel and a driving circuit electrically connected to the display panel, wherein, the display panel comprises a substrate, which is divided into a plurality of sub-pixel areas, each of which comprises a thin film transistor and an organic light-emitting diode device provided above the thin film transistor, wherein, a pixel define layer and a conductive layer are provided above the thin film transistor and below the organic light-emitting diode device, the pixel define layer is used for defining a light-transmissive region and a non-light-transmissive region of the sub-pixel area, an upper surface of the conductive layer and an upper surface of the pixel define layer are in a same plane, and the conductive layer is electrically connected to a drain of the thin film transistor;

and

a color filter layer is provided above the thin film transistor and below both the conductive layer and the pixel define layer, and a first via hole is formed in a part of the color filter layer corresponding to the drain of the thin film transistor so that the conductive layer is electrically connected to the drain of the thin film transistor through the first via hole, the pixel define layer and the conductive layer are provided directly on the color filter layer and have substantially a same thickness throughout a cross section of the color filter layer, and the conductive layer is made of a conductive resin.

11. The display device according to claim 10, wherein the conductive layer has a light transmittance larger than or equal to 95% and a surface resistance in the range of 45 Ω

/sq to 90 Ω

/sq.

12. The display device according to claim 11, wherein the conductive resin comprises resin, and conductive particles, photo-initiator, monomer, dispersant and surfactant which are uniformly distributed in the resin, and the conductive particles comprise nanoscale SnO₂ doped with antimony, nanoscale ITO or uniformly dispersed nano-silver solution.

13. The display device according to claim 12, wherein the pixel define layer is formed by using a patterning process, and the conductive layer is formed by way of ink-jetting by taking the pixel define layer as a barricade.

14. The display device according to claim 10, wherein, in the sub-pixel area, a passivation layer is provided above the thin film transistor and below the color filter layer, a second via hole is formed in a part of the passivation layer corresponding to the drain of the thin film transistor, and axes of the second via hole and the first via hole coincide with each other so that the conductive layer is electrically connected to the drain of the thin film transistor through the first via hole and the second via hole.

15. The display device according to claim 14, wherein, a black matrix is provided above the passivation layer and below the color filter layer, and the black matrix is at least partially overlapped with a source and the drain of the thin film transistor in an orthographic projection direction, respectively.

16. The display device according to claim 10, wherein, in the sub-pixel area, the conductive layer serves as an electrode of the organic light-emitting diode device, and the organic light-emitting diode device further comprises a light-emitting layer formed above the conductive layer and another electrode formed above the light-emitting layer.

17. The display device according to claim 15, wherein, each of the passivation layer, the black matrix and the color filter layer is formed by a patterning process.