Display device

• US 10,466,560 B2
• Filed: 11/17/2017
• Issued: 11/05/2019
• Est. Priority Date: 11/22/2016
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Yamazaki, Shunpei, Yoshizumi, Kensuke, Shishido, Hideaki
• Primary Examiner(s): Glick, Edward J
• Assistant Examiner(s): Peterson, William D
• Application Number:
  US15/816,277
• Publication Number:
  US 20180143473A1
• Time in Patent Office: 718 Days
• Field of Search: 349 43
• CPC Class Codes: G02F 1/133512 Light shielding layers, e.g. black matrix G02F1/136209 takes precedence
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/136227 Through-hole connection of the pixel electrode to the active element through an insulation layer
• CPC Class Codes: G02F 1/136286 Wiring, e.g. gate line, drain line
• CPC Class Codes: G02F 1/1368 in which the switching element is a three-electrode device G02F1/136277 takes precedence
• CPC Class Codes: G02F 2201/123 pixel
• CPC Class Codes: G02F 2201/40 Arrangements for improving the aperture ratio
• CPC Class Codes: G02F 2201/44 Arrangements combining different electro-active layers, e.g. electrochromic, liquid crystal or electroluminescent layers

Abstract

A display device whose power consumption can be reduced is provided. Alternatively, the aperture ratio of a display device is increased. The display device includes a pixel having a first subpixel and a second subpixel. The first subpixel includes a first coloring layer and a first transistor, and the second subpixel includes a second coloring layer and a second transistor. At least regions where channels might be formed in semiconductor layers of the first and second transistors are positioned to overlap with the first coloring layer. The first coloring layer is likely to absorb light with a shorter wavelength than light absorbed by the second coloring layer. The semiconductor layers, electrodes, wirings, and the like included in the transistors transmit visible light.

Claims

1. A display device comprising:

a first coloring layer;

a second coloring layer;

a first transistor comprising a first semiconductor layer;

a second transistor comprising a second semiconductor layer;

a first display element electrically connected to the first transistor and overlapping with the first coloring layer; and

a second display element electrically connected to the second transistor and overlapping with the second coloring layer,

wherein the first semiconductor layer and the second semiconductor layer each comprise a region overlapping with the first coloring layer.

2. The display device according to claim 1, wherein the first coloring layer transmits longer wavelength light than the second coloring layer.

3. The display device according to claim 1, wherein the first coloring layer transmits red light.

4. The display device according to claim 1 further comprising a light source emitting white light,

wherein the first coloring layer is between the light source and each of the first semiconductor layer and the second semiconductor layer.

5. The display device according to claim 1,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer, and

wherein each of the first electrode, the second electrode, the third electrode, and the fourth electrode comprises a region transmitting visible light and overlapping with the first coloring layer.

6. The display device according to claim 1,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively, and

wherein each of the first gate electrode and the second gate electrode comprises a region transmitting visible light and overlapping with the first coloring layer.

7. The display device according to claim 1,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively, and

wherein each of the first gate electrode and the second gate electrode blocks visible light.

8. The display device according to claim 1 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer,

wherein the first electrode is electrically connected to the first wiring,

wherein the second electrode is electrically connected to the first display element,

wherein the third electrode is electrically connected to the second wiring, and

wherein the fourth electrode is electrically connected to the second display element and intersects with the second wiring.

9. The display device according to claim 1 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer,

wherein the first electrode is electrically connected to the first wiring,

wherein the second electrode is electrically connected to the first display element,

wherein the third electrode is electrically connected to the second wiring, and

wherein the fourth electrode is electrically connected to the second display element and intersects with the first wiring and with the second wiring.

10. The display device according to claim 1 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively,

wherein the first semiconductor layer comprises a region overlapping with the first gate electrode and a region connected to the first wiring, and

wherein the second semiconductor layer comprises a region overlapping with the second gate electrode, a region connected to the second wiring, and a region intersecting with the second wiring.

11. The display device according to claim 1 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively,

wherein the first semiconductor layer comprises a region overlapping with the first gate electrode and a region connected to the first wiring, and

wherein the second semiconductor layer comprises a region overlapping with the second gate electrode, a region connected to the second wiring, and a region intersecting with the second wiring and with the first wiring.

12. The display device according to claim 1, wherein each of the first semiconductor layer and the second semiconductor layer comprises a metal oxide.

13. The display device according to claim 1,

wherein the first display element comprises a fifth electrode, a sixth electrode, and a liquid crystal,

wherein the fifth electrode is electrically connected to the first transistor, and

wherein each of the fifth electrode and the sixth electrode transmits visible light.

14. A display device comprising:

a first coloring layer;

a second coloring layer;

a third coloring layer;

a first transistor comprising a first semiconductor layer;

a second transistor comprising a second semiconductor layer;

a third transistor comprising a third semiconductor layer;

a first display element electrically connected to the first transistor and overlapping with the first coloring layer;

a second display element electrically connected to the second transistor and overlapping with the second coloring layer; and

a third display element electrically connected to the third transistor and overlapping with the third coloring layer,

wherein the first semiconductor layer, the second semiconductor layer, and the third semiconductor layer each comprise a region overlapping with the first coloring layer.

15. The display device according to claim 14, wherein the first coloring layer transmits longer wavelength light than the second coloring layer and the third coloring layer.

16. The display device according to claim 14, wherein the first coloring layer transmits red light.

17. The display device according to claim 14 further comprising a light source emitting white light,

wherein the first coloring layer is between the light source and each of the first semiconductor layer, the second semiconductor layer, and the third semiconductor layer.

18. The display device according to claim 14,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer,

wherein the third transistor comprises a fifth electrode and a sixth electrode each connected to the third semiconductor layer, and

wherein each of the first electrode, the second electrode, the third electrode, the fourth electrode, the fifth electrode, and the sixth electrode comprises a region transmitting visible light and overlapping with the first coloring layer.

19. The display device according to claim 14,

wherein the first transistor, the second transistor, and the third transistor comprise a first gate electrode, a second gate electrode, and a third gate electrode, respectively, and

wherein each of the first gate electrode, the second gate electrode, and the third gate electrode comprises a region transmitting visible light and overlapping with the first coloring layer.

20. The display device according to claim 14,

wherein the first transistor, the second transistor, and the third transistor comprise a first gate electrode, a second gate electrode, and a third gate electrode, respectively, and

wherein each of the first gate electrode, the second gate electrode, and the third gate electrode blocks visible light.

21. The display device according to claim 14 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer,

wherein the first electrode is electrically connected to the first wiring,

wherein the second electrode is electrically connected to the first display element,

wherein the third electrode is electrically connected to the second wiring, and

wherein the fourth electrode is electrically connected to the second display element and intersects with the second wiring.

22. The display device according to claim 14 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor comprises a first electrode and a second electrode each connected to the first semiconductor layer,

wherein the second transistor comprises a third electrode and a fourth electrode each connected to the second semiconductor layer,

wherein the first electrode is electrically connected to the first wiring,

wherein the second electrode is electrically connected to the first display element,

wherein the third electrode is electrically connected to the second wiring, and

wherein the fourth electrode is electrically connected to the second display element and intersects with the first wiring and with the second wiring.

23. The display device according to claim 14 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively,

wherein the first semiconductor layer comprises a region overlapping with the first gate electrode and a region connected to the first wiring, and

wherein the second semiconductor layer comprises a region overlapping with the second gate electrode, a region connected to the second wiring, and a region intersecting with the second wiring.

24. The display device according to claim 14 further comprising:

a first wiring; and

a second wiring,

wherein the first transistor and the second transistor comprise a first gate electrode and a second gate electrode, respectively,

wherein the first semiconductor layer comprises a region overlapping with the first gate electrode and a region connected to the first wiring, and

wherein the second semiconductor layer comprises a region overlapping with the second gate electrode, a region connected to the second wiring, and a region intersecting with the second wiring and with the first wiring.

25. The display device according to claim 14, wherein each of the first semiconductor layer and the second semiconductor layer comprises a metal oxide.

26. The display device according to claim 14,

wherein the first display element comprises a fifth electrode, a sixth electrode, and a liquid crystal,

wherein the fifth electrode is electrically connected to the first transistor, and

wherein each of the fifth electrode and the sixth electrode transmits visible light.