Semiconductor device and light-emitting device

• US 8,890,407 B2
• Filed: 05/05/2012
• Issued: 11/18/2014
• Est. Priority Date: 11/02/2004
• Status: Expired due to Fees

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Abe, Hiroko, Seo, Satoshi, Yamazaki, Shunpei
• Primary Examiner(s): Patel, Ashok
• Application Number:
  US13/464,969
• Publication Number:
  US 20120273776A1
• Time in Patent Office: 927 Days
• Field of Search: 313/504, 313/506
• US Class Current: 313/506
• CPC Class Codes: G09G 2300/0847 being a dynamic memory without any storage capacitor, i.e. with use of parasitic capacitances as storage elements
• CPC Class Codes: G09G 2310/0248 Precharge or discharge of column electrodes before or after applying exact column voltages
• CPC Class Codes: G09G 2310/0251 Precharge or discharge of pixel before applying new pixel voltage
• CPC Class Codes: G09G 3/2022 using sub-frames
• CPC Class Codes: G09G 3/3258 with pixel circuitry controlling the voltage across the light-emitting element
• CPC Class Codes: H01L 27/12 the substrate being other than a semiconductor body, e.g. an insulating body
• 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: Y10S 428/917 Electroluminescent

Abstract

One feature of a semiconductor device of the present invention is to include an electrode that serves as an electrode of a light-emitting element. The electrode includes a first layer and a second layer. Further, end portions of the electrode are covered with a partition layer having an opening portion. Moreover, a part of the electrode is exposed by the opening portion of the partition layer. One feature of a semiconductor device of the present invention is to include an electrode that serves as an electrode of a light-emitting element and a transistor. The electrode and the transistor are connected electrically to each other. The electrode includes a first layer and a second layer. Further, end portions of the electrode are covered with a partition layer having an opening portion. Moreover, the second layer is exposed by the opening portion of the partition layer.

Claims

1. A semiconductor device comprising:

a transistor;

a first electrode electrically connected to the transistor and serving as an electrode of a light-emitting element, the first electrode comprising a first layer and a second layer over the first layer; and

a partition layer covering an end portion of the first electrode and comprising an opening portion to expose a part of the second layer,

wherein the first layer comprises a conductive substance,

wherein the second layer comprises an electron transporting substance and a substance showing electron donating property to the electron transporting substance, and

wherein the partition layer is in contact with a top surface of the second layer.

2. The semiconductor device according to claim 1, wherein the second layer is 100 nm to 300 nm thick.

3. The semiconductor device according to claim 1, wherein the substance showing electron donating property is one selected from lithium oxide, calcium oxide and magnesium oxide.

4. A light-emitting device comprising:

a semiconductor device according to claim 1;

a light-emitting layer; and

a second electrode,

wherein the first electrode, the light-emitting layer and the second electrode are overlapped with each other.

5. The light-emitting device according to claim 4, wherein the second layer is 100 nm to 300 nm thick.

6. An electronic device using the light-emitting device according to claim 4 in a display portion.

7. The light-emitting device according to claim 4, wherein the substance showing electron donating property is one selected from lithium oxide, calcium oxide and magnesium oxide.

8. The semiconductor device according to claim 1, further comprising an insulating layer over the transistor,

wherein the first layer is in contact with the insulating layer.

9. A semiconductor device comprising:

a first transistor;

a first electrode electrically connected to the first transistor and serving as an electrode of a first light-emitting element;

a second transistor;

a second electrode electrically connected to the second transistor and serving as an electrode of a second light-emitting element; and

a partition layer covering an end portion of the first electrode and an end portion of the second electrode,

wherein each of the first electrode and the second electrode comprises;

a first layer comprising a conductive substance; and

a second layer over the first layer, the second layer comprising an electron transporting substance and a substance showing electron donating property to the electron transporting substance,

wherein the partition layer comprises at least a first opening portion to expose a part of the second layer of the first electrode and a second opening portion to expose a part of the second layer of the second electrode,

wherein the partition layer is in contact with a top surface of the second layer of the first electrode and a top surface of the second layer of the second electrode, and

wherein an emission color of the first light-emitting element is different from an emission color of the second light-emitting element and a thickness of the second layer of the first electrode is different from a thickness of the second layer of the second electrode.

10. The semiconductor device according to claim 9, wherein the second layer is 100 nm to 300 nm thick.

11. The semiconductor device according to claim 9, wherein the substance showing electron donating property is one selected from lithium oxide, calcium oxide and magnesium oxide.

12. The semiconductor device according to claim 9, further comprising an insulating layer over the first transistor and the second transistor,

wherein the first layer of the first electrode and the first layer of the second electrode are in contact with the insulating layer.