Photodetector, liquid crystal display device, and light-emitting device

• US 9,287,425 B2
• Filed: 06/09/2014
• Issued: 03/15/2016
• Est. Priority Date: 08/21/2009
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kurokawa, Yoshiyuki, Ikeda, Takayuki
• Primary Examiner(s): DUONG, THOI V
• Application Number:
  US14/299,057
• Publication Number:
  US 20140285755A1
• Time in Patent Office: 645 Days
• Field of Search: 257/43, 257/432, 257/435, 257/292, 257/431, 257/447, 257/294, 257/443, 257/444, 257/460, 257/88, 438/70, 438/104, 438/66, 250/208.1, 349/106, 349/138, 349/42, 349/65, 349/50, 349/52, 349/43, 349/46, 349/61, 359/891
• US Class Current: 1/1
• CPC Class Codes: G02F 1/13312 Circuits comprising photodetectors for purposes other than feedback
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: H01L 27/1446 in a repetitive configuration
• CPC Class Codes: H01L 27/14618 Containers
• CPC Class Codes: H01L 27/14621 Colour filter arrangements
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H01L 31/02164 for shielding light, e.g. light blocking layers, cold shields for infrared detectors
• CPC Class Codes: H01L 31/02327 the optical elements being integrated or being directly associated to the device, e.g. back reflectors optical coatings H01L31/0216
• CPC Class Codes: H10K 59/13 comprising photosensors that control luminance

Abstract

One embodiment of the present invention includes a first light-blocking layer and a second light-blocking layer which are over a light-transmitting substrate, a first photodiode over the first light-blocking layer, a second photodiode over the second light-blocking layer, a first color filter covering the first photodiode, a second color filter covering the second photodiode, and a third light-blocking layer formed using the first color filter and the second color filter and disposed between the first photodiode and the second photodiode.

Claims

1. A semiconductor device comprising:

a first light-transmitting insulating layer over a light-transmitting substrate;

a photodiode over and in contact with the first light-transmitting insulating layer, the photodiode comprising an oxide semiconductor film;

a second light-transmitting insulating layer over and covering the photodiode;

a first color filter over and covering the second light-transmitting insulating layer, the first color filter in contact with the first light-transmitting insulating layer; and

a second color filter in contact with the first light-transmitting insulating layer and the first color filter.

2. The semiconductor device according to claim 1, further comprising:

a light-blocking layer between the light-transmitting substrate and the first light-transmitting insulating layer,

wherein the photodiode overlaps with the light-blocking layer.

3. The semiconductor device according to claim 2, wherein the light-blocking layer is a reflecting layer.

4. The semiconductor device according to claim 1, further comprising:

a liquid crystal layer over the first color filter and the second color filter; and

a substrate over the liquid crystal layer.

5. The semiconductor device according to claim 1, wherein the light-transmitting substrate has flexibility.

6. The semiconductor device according to claim 1, wherein the photodiode is a vertical diode.

7. A semiconductor device comprising:

a first light-transmitting insulating layer over a light-transmitting substrate;

a photodiode over and in contact with the first light-transmitting insulating layer, the photodiode comprising a first oxide semiconductor film;

a transistor comprising a second oxide semiconductor film over and with the first light-transmitting insulating layer;

a second light-transmitting insulating layer over and covering the photodiode;

a first color filter over and covering the second light-transmitting insulating layer, the first color filter in contact with the first light-transmitting insulating layer; and

a second color filter in contact with the first light-transmitting insulating layer and the first color filter.

8. The semiconductor device according to claim 7, further comprising:

a light-blocking layer between the light-transmitting substrate and the first light-transmitting insulating layer,

wherein the photodiode overlaps with the light-blocking layer.

9. The semiconductor device according to claim 8, wherein the light-blocking layer is a reflecting layer.

10. The semiconductor device according to claim 7, further comprising:

a light-blocking layer between the light-transmitting substrate and the first light-transmitting insulating layer,

wherein the second semiconductor layer overlaps with the light-blocking layer.

11. The semiconductor device according to claim 7, further comprising:

a liquid crystal layer over the first color filter and the second color filter; and

a substrate over the liquid crystal layer.

12. The semiconductor device according to claim 7, wherein the light-transmitting substrate has flexibility.

13. The semiconductor device according to claim 7, wherein the photodiode is a vertical diode.

14. A semiconductor device comprising:

a first light-transmitting insulating layer over a light-transmitting substrate;

a first photodiode over and in contact with the first light-transmitting insulating layer, the first photodiode comprising a first oxide semiconductor film;

a second photodiode over and in contact with the first light-transmitting insulating layer, the second photodiode comprising a second oxide semiconductor film;

a second light-transmitting insulating layer over the first photodiode and the second photodiode, the second light-transmitting insulating layer covering the first photodiode and the second photodiode;

a groove in the second light-transmitting insulating layer, the groove reaching the first light-transmitting insulating layer;

a first color filter in the groove, the first color filter in contact with the first light-transmitting insulating layer; and

a second color filter in the groove, the second color filter in contact with the first light-transmitting insulating layer and the first color filter,

wherein the groove is positioned between the first photodiode and the second photodiode.

15. The semiconductor device according to claim 14, further comprising:

a first light-blocking layer and second light-blocking layer between the light-transmitting substrate and the first light-transmitting insulating layer,

wherein the first photodiode overlaps with the first light-blocking layer, and

wherein the second photodiode overlaps with the second light-blocking layer.

16. The semiconductor device according to claim 15, wherein each of the first light-blocking layer and the second light-blocking layer is a reflecting layer.

17. The semiconductor device according to claim 14, further comprising:

a transistor comprising a third oxide semiconductor film over and with the first light-transmitting insulating layer.

18. The semiconductor device according to claim 14, further comprising:

a liquid crystal layer over the first color filter and the second color filter; and

a substrate over the liquid crystal layer.

19. The semiconductor device according to claim 14, wherein the light-transmitting substrate has flexibility.

20. The semiconductor device according to claim 14, wherein each of the first photodiode and the second photodiode is a vertical diode.