Electroluminescent display device

• US 20040012332A1
• Filed: 04/22/2003
• Published: 01/22/2004
• Est. Priority Date: 04/24/2002
• Status: Active Grant

• Current Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Sanyo Electric Company Limited (Panasonic Holdings Corporation)
• Inventors: Sasatani, Toru, Omura, Tetsuji
• Granted Patent: US 6,930,449 B2
• Time in Patent Office: Days
• US Class Current: 313/506
• 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 59/874 including getter material or desiccant

Abstract

In a sealing structure of an electroluminescent display device, in which a first glass substrate formed with an EL element and a second glass substrate as a cap are attached to each other, breaking of the element device is prevented when external force is applied to the first glass substrate and the second glass substrate. The sealing structure has the first glass substrate provided with the EL element on a surface thereof, the second glass substrate attached to the first glass substrate with a sealing resin, a desiccant layer formed on a surface of the second glass substrate and a stress buffer layer covering a surface of the desiccant layer.

Claims

1. An electroluminescent display device comprising:

a first substrate having an electroluminescent element thereon;

a second substrate attached to the first substrate;

a desiccant layer disposed on the second substrate so that the desiccant layer faces the first substrate; and

a stress buffer layer covering the desiccant layer.

2. The electroluminescent display device of claim 1, wherein the stress buffer layer is made of a resin.

3. The electroluminescent display device of claim 1, wherein the stress buffer layer includes a plurality of air vents.

4. The electroluminescent display device of claim 2, wherein the stress buffer layer includes a plurality of air vents.

5. The electroluminescent display device of claim 1, wherein the second substrate includes a concave portion and the desiccant layer is disposed in the concave portion.

6. An electroluminescent display device comprising:

a first substrate having an electroluminescent element thereon;

a second substrate attached to the first substrate; and

a desiccant layer disposed on the second substrate so that the desiccant layer faces the first substrate, the desiccant layer having an elastic coefficient low enough to absorb mechanical stresses generated by the electroluminescent element contacting the desiccant layer under an application of an external force to the display device.

7. The electroluminescent display device of claim 6, wherein the desiccant layer includes a rein and the content of the resin in the desiccant layer is 20% by weight or higher.

8. The electroluminescent display device of claim 7, wherein the resin is an epoxy resin or an UV resin.