Display device and manufacturing method thereof

• US 7,067,395 B2
• Filed: 03/02/2004
• Issued: 06/27/2006
• Est. Priority Date: 04/27/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Takahashi, Masahiro, Maruyama, Junya
• Primary Examiner(s): GEYER, SCOTT B
• Application Number:
  US10/790,962
• Publication Number:
  US 20040171184A1
• Time in Patent Office: 847 Days
• Field of Search: 438/455, 438/456, 438/458, 438/459
• US Class Current: 438/455
• 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 50/846 comprising getter material or desiccants
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass

Abstract

A technique for obtaining light emitting devices manufactured with high yield is provided. The width of a seal pattern (605b) can be kept thin by manufacturing a light emitting device using a second substrate (600a) which has a concave portion (607a) and a concave portion (608a). It therefore becomes possible to make the light emitting device have a narrow frame. In addition, the light emitting device with the narrow frame can be realized by a manufacturing method thereof in which a portion of the second substrate from the concave portion to an edge surface is cut.

Claims

1. A method of manufacturing a display device comprising:

forming a thin film transistor over a first substrate;

forming a pixel electrode over the first substrate, wherein the pixel electrode is electrically connected to the thin film transistor; and

bonding the first substrate and a second substrate through a seal pattern, wherein at least one concave portion is formed in the second substrate,

wherein at least one of the first substrate and the second substrate has a light transmittance property,

wherein a step of hardening the seal pattern is performed in an arrangement in which the first substrate is at an upper side and the second substrate is at a lower side, and

wherein at least a portion of the seal pattern is located in the concave portion of the second substrate after bonding the first substrate and the second substrate.

2. A method of manufacturing a display device according to claim 1, further comprising a light emitting layer comprising an organic material over the pixel electrode.

3. A method of manufacturing a display device according to claim 1, wherein the seal pattern comprises an organic material.

4. A method of manufacturing a display device, comprising:

forming a light emitting element over a first substrate, said light emitting element comprising an anode, an light emitting layer comprising an organic material, and a cathode;

forming at least one concave portion in a front surface of a second substrate; and

bonding the first substrate and the second substrate through a sealing material;

wherein the first substrate has a light transmittance property,

wherein the sealing material fills the concave portion of the second substrate, and

wherein a drying agent is provided between the first substrate and the second substrate.

5. A method of manufacturing a display device according to claim 4 further comprising:

applying pressure to a rear surface of the second substrate, making cracks develop in the second substrate from the concave portion, and cutting the second substrate.

6. A method of manufacturing a display device according to claim 4, wherein the second substrate has a second concave portion, and

wherein the drying agent is provided in the second concave portion.

7. A method of manufacturing a display device according to claim 4, wherein the sealing material comprises an organic material.

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

forming a thin film transistor over a first substrate;

forming a pixel electrode over the first substrate, wherein the pixel electrode is electrically connected to the thin film transistor;

preparing a second substrate having at least one concave portion; and

bonding the first substrate and the second substrate through a sealing material;

wherein at least one of the first substrate and the second substrate has a light transmittance property, and

wherein the sealing material fills the concave portion of the second substrate.

9. A method of manufacturing a display device according to claim 8 further comprising:

applying pressure to a rear surface of the second substrate, making cracks develop in the second substrate from the concave portion, and cutting the second substrate.

10. A method of manufacturing a display device according to claim 8, further comprising a light emitting layer comprising an organic material over the pixel electrode.

11. A method of manufacturing a display device according to claim 8, wherein the sealing material comprises an organic material.

12. A method of manufacturing a display device, comprising:

forming a light emitting element over a first substrate, said light emitting element comprising an anode, an light emitting layer comprising an organic material, and a cathode; and

bonding the first substrate and a second substrate through a seal pattern, wherein at least one concave portion is formed in the second substrate;

wherein at least one of the first substrate and the second substrate has a light transmittance property,

wherein a step of hardening the seal pattern is performed in an arrangement in which the first substrate is at an upper side and the second substrate is at a lower side, and

wherein at least a portion of the seal pattern is located in the concave portion of the second substrate after bonding the first substrate and the second substrate.

13. A method of manufacturing a display device according to claim 12, wherein the seal pattern comprises an organic material.

14. A method of manufacturing a display device, comprising:

forming a light emitting element over a first substrate, said light emitting element comprising an anode, a light emitting layer comprising an organic material, and a cathode;

preparing a second substrate having at least one concave portion; and

bonding the first substrate and the second substrate through a sealing material;

wherein at least one of the first substrate and the second substrate has a light transmittance property, and

wherein the sealing material fills the concave portion of the second substrate.

15. A method of manufacturing a display device according to claim 14, wherein the sealing material comprises an organic material.

16. A method of manufacturing a display device, comprising:

forming a light emitting element over a first substrate, said light emitting element comprising an anode, a light emitting layer comprising an organic material, and a cathode;

preparing a second substrate having at least one concave portion; and

bonding the first substrate and the second substrate through a sealing material;

wherein the first substrate has a light transmittance property,

wherein the sealing material fills the concave portion of the second substrate, and

wherein a drying agent is provided between the first substrate and the second substrate.

17. A method of manufacturing a display device according to claim 16, wherein the second substrate has a second concave portion, and

wherein the drying agent is provided in the second concave portion.

18. A method of manufacturing a display device according to claim 16, wherein the sealing material comprises an organic material.