Display module

• US 6,977,463 B2
• Filed: 04/25/2005
• Issued: 12/20/2005
• Est. Priority Date: 03/28/2001
• Status: Expired due to Term

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Hitachi, Ltd.
• Inventors: Sato, Toshihiro
• Primary Examiner(s): Patel, Vip
• Application Number:
  US11/113,173
• Publication Number:
  US 20050194894A1
• Time in Patent Office: 239 Days
• Field of Search: 313/498, 313/500, 313/505, 313/506, 313/512
• US Class Current: 313/498
• CPC Class Codes: G09G 2300/0842 forming a memory circuit, e.g. a dynamic memory with one capacitor
• CPC Class Codes: G09G 2320/0233 Improving the luminance or brightness uniformity across the screen
• CPC Class Codes: G09G 3/3233 with pixel circuitry controlling the current through the light-emitting element
• CPC Class Codes: H10K 50/81 Anodes
• CPC Class Codes: H10K 50/828 Transparent cathodes, e.g. comprising thin metal layers
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 59/1213 the pixel elements being TFTs
• CPC Class Codes: H10K 59/1216 the pixel elements being capacitors
• 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 59/124 Insulating layers formed between TFT elements and OLED elements
• CPC Class Codes: H10K 59/131 Interconnections, e.g. wiring lines or terminals
• CPC Class Codes: H10K 59/87 Passivation; Containers; Encapsulations

Abstract

A display module including a TFT and an OLED which is formed by first and second electrode layers and an OLE layer. An insulating film is formed on the first electrode and includes an aperture at a recessed portion of the first electrode. The insulating layer includes an inner wall at the aperture, which inner wall has a surface of a convex plane on an edge of the recessed part of the first electrode layer, the convex plane being located between the OLE and the edge of the first electrode layer.

Claims

1. A display module, comprising:

a TFT,

a first insulation layer provided on a source electrode of the TFT,

a first electrode layer connected to the source electrode, provided on the first insulation layer,

a second insulation layer formed on the first insulation layer and the first electrode layer, said second insulation layer being provided with an aperture at a recessed part of the first electrode layer,

a second electrode layer formed on the first electrode and the second insulation layer, and

an organic light emitting layer formed in the aperture at the recessed part;

wherein the second insulation layer includes an inner wall at the aperture, said inner wall having a surface of a convex plane on an edge of the recessed part of the first electrode layer; and

wherein the convex plane is located between the organic light emitting layer and the edge of the first electrode layer.

3. The display module according to claim 1 or 2,

wherein the aperture at the recessed part is formed in bypassed regions from a pixel circuit and a wire.

4. The display module according to claim 1 or 2,

wherein the second insulation layer is formed by being coated with a resin.

5. The display module according to claim 4,

wherein the second insulation layer is formed by being coated with an acrylic resin.

6. The display module according to claim 1 or 2,

wherein the second insulation layer is formed by covering all edges of the first electrode layer in the aperture.

7. The display module according to claim 1 or 2,

wherein the first electrode is formed using ITO.

8. The display module according to claim 1 or 2,

wherein the organic light emitting layer is formed in the aperture of the second insulation layer by using an inkjet system, a mask printing system or a spin coating system.

2. A display module, comprising:

a TFT,

a first insulation layer provided on a source electrode of the TFT,

a first electrode layer connected by the source electrode, provided on the first insulation layer,

a second insulation layer formed on the first insulation layer and the first electrode layer, and said second insulation layer being provided with an aperture at a recessed part of the first electrode layer,

a second electrode layer formed on the first electrode and the second insulation layer, and

an organic light emitting layer formed in the aperture at the recessed part;

wherein the second insulation layer includes an inner wall at the aperture, said inner wall having a surface of a convex curve in a sectional view of the inner wall on edge of the recessed part of the first electrode layer; and

wherein the organic light emitting layer and the edge of the first electrode layer are isolated from one another by the inner wall.

9. A display module, comprising:

a polysilicon layer,

a first insulation layer formed on the polysilicon layer,

a gate electrode formed on the first insulation layer,

a second insulation layer formed on the gate electrode,

a source electrode connected from the polysilicon layer to the second insulation layer,

a third insulation layer provided on the source electrode,

a first electrode layer connected to the source electrode by a contact hole being provided on the third insulation layer,

a fourth insulation layer being formed on the third insulation layer and the first electrode, said fourth insulation layer being provided with an aperture at a recessed part of the first electrode layer pattern,

a second electrode layer formed on the first electrode layer and the fourth insulation layer, and

an organic light emitting layer formed in the aperture at the recessed part;

wherein the fourth insulation layer includes an inner wall having a surface of a convex plane on an edge of the recessed part of the first electrode layer; and

wherein the convex plane is located between the organic light emitting layer and the edge of the first electrode layer.

10. A display module, comprising:

a polysilicon layer,

a first insulation layer formed on the polysilicon layer,

a gate electrode formed on the first insulation layer,

a second insulation layer formed on the gate electrode,

a source electrode connected from the polysilicon layer to the second insulation layer,

a third insulation layer provided on the source electrode,

a first electrode layer connected to the source electrode by a contact hole being provided on the third insulation layer,

a fourth insulation layer formed on the third insulation layer and the first electrode, said fourth insulation layer being provided with an aperture at a recessed part of the first electrode layer pattern,

a second electrode layer formed on the first electrode layer and the fourth insulation layer, and

an organic light emitting layer formed in the aperture at the recessed part;

wherein the fourth insulation layer includes an inner wall having a surface of a convex curve in a sectional view of the inner wall on an edge of the recessed part of the first electrode layer, and

wherein the organic light emitting layer and the edge of the first electrode layer are isolated from one another by the inner wall.

11. The display module according to claim 9 or 10,

wherein the aperture at the recessed part is formed in bypassed regions from a pixel circuit and a wire.

12. The display module according to claim 9 or 10,

wherein the fourth insulation layer is formed by being coated with a resin.

13. The display module according to claim 12,

wherein the fourth insulation layer is formed by being coated with an acrylic resin.

14. The display module according to claim 9 or 10,

wherein the fourth insulating layer is formed by covering all edges of the first electrode layer in the aperture.

15. The display module according to claim 9 or 10,

wherein the first electrode is formed using ITO.

16. The display module according to claim 9 or 10,

wherein the organic light emitting layer is formed in the aperture of the fourth insulation layer by using an inkjet system, a mask printing system or a spin coating system.