Display device and manufacturing method thereof

• US 10,170,726 B2
• Filed: 07/26/2016
• Issued: 01/01/2019
• Est. Priority Date: 08/28/2012
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Hirakata, Yoshiharu, Nishi, Takeshi
• Primary Examiner(s): Santiago, Mariceli
• Application Number:
  US15/219,319
• Publication Number:
  US 20160336538A1
• Time in Patent Office: 889 Days
• CPC Class Codes: G02F 1/133308 Support structures for LCD panels, e.g. frames or bezels
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells
• CPC Class Codes: H01L 27/1214 comprising a plurality of TFTs formed on a non-semiconducting substrate, e.g. driving circuits for AMLCDs
• CPC Class Codes: H01L 27/1225 with semiconductor materials not belonging to the group IV of the periodic table, e.g. InGaZnO
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/841 Self-supporting sealing arrangements
• CPC Class Codes: H10K 50/8426 Peripheral sealing arrangements, e.g. adhesives, sealants
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 77/111 Flexible substrates
• CPC Class Codes: Y02E 10/549 Organic PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

A display device in which reliability of a display element is improved is provided. Alternatively, a display device in which reliability of a transistor is improved is provided. Alternatively, a display device in which an increase in an area of a periphery region is suppressed is provided. A display device includes a display region including a display element between a first flexible substrate and a second flexible substrate in which the display region is surrounded by a first continuous sealant, the first sealant is surrounded by a second continuous sealant, and the second sealant is provided between the first substrate and the second substrate and on at least one of a side surface of the first substrate and a side surface of the second substrate.

Claims

1. A method for manufacturing a display device, comprising:

forming an insulating film over and in contact with a first substrate with flexibility;

forming a first sealant continuously surrounding a display region over the insulating film;

irradiating the first sealant with a first laser beam;

bonding a second substrate with flexibility to the first substrate with the first sealant;

irradiating the first sealant with a second laser beam;

forming a second sealant continuously surrounding the first sealant in a gap between the first substrate and the second substrate and on a side surface of the first substrate and a side surface of the second substrate; and

forming a member in contact with a side surface of the second sealant,

wherein the member comprises a bottom surface portion in contact with a top surface of the insulating film.

2. The method according to claim 1, wherein the first sealant comprises glass.

3. The method according to claim 1, wherein the second sealant comprises a resin material or glass.

4. The method according to claim 1, wherein the member comprises a metal material.

5. The method according to claim 1, wherein the member surrounds the second sealant.

6. The method according to claim 1, wherein a wavelength of the first laser beam is 810 nm or 940 nm.

7. The method according to claim 1, wherein the second laser beam is irradiated from a side surface direction of the first substrate.

8. A method for manufacturing a display device, comprising:

forming an insulating film over and in contact with a first substrate with flexibility;

forming a first sealant continuously surrounding a display region over the insulating film;

irradiating the first sealant with a first laser beam;

bonding a second substrate with flexibility to the first substrate with the first sealant;

irradiating the first sealant with a second laser beam;

forming a second sealant continuously surrounding the first sealant in a gap between the first substrate and the second substrate and on a side surface of the first substrate and a side surface of the second substrate;

forming a member in contact with a side surface of the second sealant; and

forming an FPC over the first substrate,

wherein the member comprises a bottom surface portion in contact with a top surface of the insulating film.

9. The method according to claim 8, wherein the first sealant comprises glass.

10. The method according to claim 8, wherein the second sealant comprises a resin material or glass.

11. The method according to claim 8, wherein the member comprises a metal material.

12. The method according to claim 8, wherein the member surrounds the second sealant.

13. The method according to claim 8, wherein a wavelength of the first laser beam is 810 nm or 940 nm.

14. The method according to claim 8, wherein the second laser beam is irradiated from a side surface direction of the first substrate.