Organic light emitting device having dual flexible substrates

• US 9,276,224 B2
• Filed: 11/26/2013
• Issued: 03/01/2016
• Est. Priority Date: 06/20/2001
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Takayama, Toru, Akiba, Mai
• Primary Examiner(s): Soward, Ida M
• Application Number:
  US14/090,692
• Publication Number:
  US 20140077199A1
• Time in Patent Office: 826 Days
• Field of Search: 257/40, 257/59, 257/72, 257/79, 257/E51.018
• US Class Current: 1/1
• CPC Class Codes: H01L 2221/68368 used in a transfer process involving at least two transfer steps, i.e. including an intermediate handle substrate
• CPC Class Codes: H10K 2102/3026 Top emission
• CPC Class Codes: H10K 2102/311 Flexible OLED
• CPC Class Codes: H10K 50/84 Passivation; Containers; Encapsulations
• CPC Class Codes: H10K 50/844 Encapsulations
• CPC Class Codes: H10K 50/8445 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 50/87 Arrangements for heating or cooling
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/1201 Manufacture or treatment
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/8731 multilayered coatings having a repetitive structure, e.g. having multiple organic-inorganic bilayers
• CPC Class Codes: H10K 59/8794 Arrangements for heating and cooling
• CPC Class Codes: H10K 71/00 Manufacture or treatment specially adapted for the organic devices covered by this subclass
• CPC Class Codes: H10K 71/80 using temporary substrates
• 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

The present invention has an object of providing a light-emitting device including an OLED formed on a plastic substrate, which prevents degradation due to penetration of moisture or oxygen. On a plastic substrate, a plurality of films for preventing oxygen or moisture from penetrating into an organic light-emitting layer in the OLED (“barrier films”) and a film having a smaller stress than the barrier films (“stress relaxing film”), the film being interposed between the barrier films, are provided. Owing to a laminate structure, if a crack occurs in one of the barrier films, the other barrier film(s) can prevent moisture or oxygen from penetrating into the organic light emitting layer. The stress relaxing film, which has a smaller stress than the barrier films, is interposed between the barrier films, making it possible to reduce stress of the entire sealing film. Therefore, a crack due to stress hardly occurs.

Claims

1. A light emitting device comprising:

a first flexible substrate;

a pixel portion over the first flexible substrate, the pixel portion comprising a transistor and an organic light emitting diode;

a wiring electrically connected to the pixel portion;

a second flexible substrate over the first flexible substrate with the pixel portion and the wiring therebetween, the second flexible substrate comprising a hole overlapping with the wiring; and

a flexible printed circuit over the second flexible substrate, the flexible printed circuit electrically connected to the wiring through the hole,

wherein the organic light emitting diode comprises a first electrode, a second electrode, and, an organic light emitting laver between the first electrode and the second electrode.

2. The light emitting device according to claim 1,

wherein the organic light emitting diode emits white light.

3. The light emitting device according to claim 1, further comprising:

an insulating film on and in contact with the organic light emitting diode;

a first film comprising silicon nitride over the insulating film; and

a second film comprising silicon nitride over the first film.

4. The light emitting device according to claim 1, further comprising a resin layer between the organic light emitting diode and the second flexible substrate.

5. A light emitting device comprising:

a first flexible substrate;

a first electrode over the first flexible substrate;

an organic light emitting layer over the first electrode;

a second electrode over the first flexible substrate with the organic light emitting layer therebetween;

a wiring over the first flexible substrate;

a second flexible substrate over the first flexible substrate with the organic light emitting layer and the wiring therebetween, the second flexible substrate comprising a hole overlapping with the wiring; and

a flexible printed circuit over the second flexible substrate, the flexible printed circuit electrically connected to the wiring through the hole.

6. The light emitting device according to claim 5,

wherein the first electrode, the organic light emitting layer, and the second electrode are included in an organic light emitting diode, and

wherein the organic light emitting diode emits white light.

7. The light emitting device according to claim 6, further comprising:

an insulating film on and in contact with the organic light emitting diode;

a first film comprising silicon nitride over the insulating film; and

a second film comprising silicon nitride over the first film.

8. The light emitting device according to claim 5, further comprising a resin layer between the organic light emitting layer and the second flexible substrate.