Display device

• US 10,734,602 B2
• Filed: 06/16/2017
• Issued: 08/04/2020
• Est. Priority Date: 06/16/2017
• Status: Active Grant

• Current Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Sharp Kabushiki Kaisha (Hon Hai Precision Industry Co., Ltd.)
• Inventors: Taniyama, Hiroki, Okabe, Tohru, Gunji, Ryosuke, Saida, Shinsuke, Inoue, Akira, Nakada, Yoshihiro
• Primary Examiner(s): Tran, Dzung
• Application Number:
  US16/467,159
• Publication Number:
  US 20190319214A1
• Time in Patent Office: 1,145 Days
• Field of Search: 257 40
• CPC Class Codes: G09F 9/30 in which the desired character or characters are formed by combining individual elements panels comprising a number of electrodes in a single cell controlling light arriving from an independent light source, e.g. electro-optical or magneto-optical cell, G02F1/00
• CPC Class Codes: H05B 33/04 Sealing arrangements , e.g. against humidity
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H05B 33/22 characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
• CPC Class Codes: H05B 33/26 characterised by the composition or arrangement of the conductive material used as an electrode
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers

Abstract

A first damming wall and a second damming wall are provided in a frame region. The first damming wall surrounds a display region formed from a first organic material and overlaps with a circumferential end part of an organic layer. The second damming wall includes a top part formed from a second organic material in the periphery of the first damming wall, and overlaps with an edge of the circumferential end part of the organic layer. The second damming wall includes a bottom part located closer to a base substrate, the bottom part being formed from a material constituting parts of switching elements.

Claims

1. A display device comprising:

a base substrate;

a plurality of switching elements provided on the base substrate;

a flattening film, provided on the plurality of switching elements, that flattens a surface shape formed by the plurality of switching elements;

a light emitting element provided on the flattening film, the light emitting element including a partition; and

a sealing film covering the light emitting element, the sealing film including a first inorganic layer, an organic layer, and a second inorganic layer layered in that order, wherein

a display region in which an image is displayed, and a frame region located in the periphery of the display region, are defined in the display device,

a first damming wall and a second damming wall are provided in the frame region, the first damming wall being made from a first organic material, surrounding the display region, and overlapping with a circumferential end portion of the organic layer, the second damming wall being defined in the periphery of the first damming wall from a second organic material, the second damming wall including a second top portion and overlapping with an edge of the circumferential end portion of the organic layer,

the second damming wall includes a second bottom portion located closer to the base substrate than the second top portion is, the second bottom portion being made from a material constituting a portion of the switching elements,

the flattening film is made from the first organic material, and

a side surface of the second bottom portion closest to the display region is in contact with the sealing film.

2. The display device according to claim 1, wherein the second damming wall includes a second middle portion between the second top portion and the second bottom portion, the second middle portion being made from the first organic material.

3. The display device according to claim 1, wherein in the frame region, a third damming wall is provided in the periphery of the second damming wall, the third damming wall including a third bottom portion, a third middle portion, and a third top portion, the third bottom portion being made from a material defining a portion of the switching elements, the third middle portion being made from the first organic material, and the third top portion being made from the second organic material.

4. The display device according to claim 1, wherein the partition is made from the second organic material.

5. The display device according to claim 1, wherein a portion of each switching element is a source electrode.

6. The display device according to claim 1, wherein a portion of each switching element is a gate electrode.

7. The display device according to claim 1, wherein an angle defined by a surface of the base substrate and a side surface of the second top portion is greater than or equal to 70 degrees.

8. The display device according to claim 1, wherein the second top portion is in contact with the second bottom portion on a side of the second bottom portion opposite the display region.

9. The display device according to claim 1, wherein

the second bottom portion includes a first conductive layer and a second conductive layer layered in that order, and

at least a portion of a perimeter edge surface of the first conductive layer is located further inward than a perimeter edge surface of the second conductive layer.

10. The display device according to claim 9, wherein

the second bottom portion includes a third conductive layer provided closer to the base substrate than the first conductive layer, and

at least a portion of a perimeter edge surface of the first conductive layer is located further inward than a perimeter edge surface of the third conductive layer.

11. The display device according to claim 9, wherein the first conductive layer includes an aluminum film.

12. The display device according to claim 1, wherein the second inorganic layer is provided covering the organic layer.

13. The display device according to claim 1, wherein a first metal layer is provided between the base substrate and the first damming wall, the first metal layer protruding from the first damming wall.

14. The display device according to claim 13, wherein a second metal layer is provided between the base substrate and the second damming wall, the second metal layer protruding from the top portion.

15. The display device according to claim 1, wherein the light emitting element is an organic electroluminescence (EL) element.

16. The display device according to claim 1, wherein the base substrate is flexible.

17. The display device according to claim 1, wherein the side surface of the second bottom portion is substantially vertical.