PHOTODETECTOR, LIQUID CRYSTAL DISPLAY DEVICE, AND LIGHT EMITTING DEVICE

• US 20110042766A1
• Filed: 08/12/2010
• Published: 02/24/2011
• 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
• Granted Patent: US 8,773,622 B2
• Time in Patent Office: Days
• US Class Current: 257/432
• 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 photodetector comprising:

a first light-blocking layer and a second light-blocking layer 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, and

a second color filter covering the second photodiode,

wherein a third light-blocking layer comprising the first color filter and the second color filter is located between the first photodiode and the second photodiode.

2. The photodetector according to claim 1, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

3. A photodetector comprising:

a first light-blocking layer and a second light-blocking layer over a light-transmitting substrate;

a light-transmitting insulating film over and in contact with the light-transmitting substrate, the first light-blocking layer, and the second light-blocking layer;

a first photodiode over the first light-blocking layer with the light-transmitting insulating film interposed therebetween;

a second photodiode over the second light-blocking layer with the light-transmitting insulating film interposed therebetween;

a first color filter covering the first photodiode; and

a second color filter covering the second photodiode,

wherein a third light-blocking layer comprising the first color filter and the second color filter which are arranged side by side is located between the first photodiode and the second photodiode, and

wherein the third light-blocking layer is formed over and in contact with the light-transmitting insulating film.

4. The photodetector according to claim 3, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

5. A liquid crystal display device comprising:

a first light-blocking layer and a second light-blocking layer over a first 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;

wherein a third light-blocking layer comprising the first color filter and the second color filter is located between the first photodiode and the second photodiode;

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

a second light-transmitting substrate over the liquid crystal layer.

6. The liquid crystal display device according to claim 5, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

7. The liquid crystal display device according to claim 5, wherein a thickness of the second light-transmitting substrate is 70 μ

m to 100 μ

m.

8. A liquid crystal display device comprising:

a first light-blocking layer and a second light-blocking layer over a first light-transmitting substrate;

a light-transmitting insulating film over and in contact with the first light-transmitting substrate, the first light-blocking layer, and the second light-blocking layer;

a first photodiode over the first light-blocking layer with the light-transmitting insulating film interposed therebetween;

a second photodiode over the second light-blocking layer with the light-transmitting insulating film interposed therebetween;

a first color filter covering the first photodiode;

a second color filter covering the second photodiode;

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

a second light-transmitting substrate over the liquid crystal layer,

wherein a third light-blocking layer comprising the first color filter and the second color filter which are arranged side by side is located between the first photodiode and the second photodiode, and

wherein the third light-blocking layer is formed over and in contact with the light-transmitting insulating film.

9. The liquid crystal display device according to claim 8, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

10. The liquid crystal display device according to claim 8, wherein a thickness of the second light-transmitting substrate is 70 μ

m to 100 μ

m.

11. A light-emitting device comprising:

a first photodiode, a second photodiode, and a light-emitting layer over a substrate; and

a first color filter and a second color filter over the light-emitting layer,

wherein the first color filter covers the first photodiode,

wherein the second color filter covers the second photodiode, and

wherein a light-blocking layer comprising the first color filter and the second color filter is located between the first photodiode and the second photodiode.

12. The light-emitting device according to claim 11, further comprising:

a first light-blocking layer and a second light-blocking layer over the substrate,

wherein the first photodiode is formed over the first light-blocking layer, and

wherein the second photodiode is formed over the second light-blocking layer.

13. The light-emitting device according to claim 12, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

14. A light-emitting device comprising:

an insulating film over a substrate;

a first photodiode, a second photodiode, and a light-emitting layer over the substrate; and

a first color filter and a second color filter over the light-emitting layer,

wherein the first color filter covers the first photodiode,

wherein the second color filter covers the second photodiode,

wherein a light-blocking layer comprising the first color filter and the second color filter which are arranged side by side is located between the first photodiode and the second photodiode, and

wherein the light-blocking layer is formed over and in contact with the insulating film.

15. The light-emitting device according to claim 14, further comprising:

a first light-blocking layer and a second light-blocking layer over the substrate,

wherein the first photodiode is formed over the first light-blocking layer with the insulating film interposed therebetween, and

wherein the second photodiode is formed over the second light-blocking layer with the insulating film interposed therebetween.

16. The light-emitting device according to claim 15, comprising:

a first reflecting layer and a second reflecting layer instead of the first light-blocking layer and the second light-blocking layer.

17. A semiconductor device comprising:

a first photodiode and a second photodiode over a substrate;

an insulating film over the first photodiode and the second photodiode, the insulating film having a groove;

a first color filter and a second color filter over the insulating film,

wherein the first color filter and the second color filter are in contact with each other in the groove of the insulating film, so that a light-blocking layer is formed in the groove.

18. The semiconductor device according to claim 17 is one of a photodetector, liquid crystal display device and a light-emitting device.