Display device and electronic device that expands color reproduction area by satisfying the surplus in the color gamut

• US 10,043,849 B2
• Filed: 01/30/2018
• Issued: 08/07/2018
• Est. Priority Date: 09/30/2005
• Status: Active Grant

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Kimura, Hajime, Miyaguchi, Atsushi
• Primary Examiner(s): Green, Tracie Y
• Application Number:
  US15/883,430
• Publication Number:
  US 20180158865A1
• Time in Patent Office: 189 Days
• CPC Class Codes: G09G 2300/0452 Details of colour pixel setup, e.g. pixel composed of a red, a blue and two green components
• CPC Class Codes: G09G 3/2003 Display of colours specific for liquid crystal displays G09G3/3607
• CPC Class Codes: G09G 3/2074 using sub-pixels
• CPC Class Codes: G09G 3/3208 organic, e.g. using organic light-emitting diodes [OLED]
• CPC Class Codes: H01L 27/15 including semiconductor components having potential barriers, specially adapted for light emission
• CPC Class Codes: H01L 29/7869 having a semiconductor body comprising an oxide semiconductor material, e.g. zinc oxide, copper aluminium oxide, cadmium stannate
• CPC Class Codes: H10K 59/12 Active-matrix OLED [AMOLED] displays
• CPC Class Codes: H10K 59/121 characterised by the geometry or disposition of pixel elements
• CPC Class Codes: H10K 59/351 comprising more than three subpixels, e.g. red-green-blue-white [RGBW]
• CPC Class Codes: H10K 59/352 the areas of the RGB subpixels being different
• CPC Class Codes: H10K 59/353 characterised by the geometrical arrangement of the RGB subpixels

Abstract

To improve color reproduction areas in a display device having light-emitting elements. A display region has a plurality of picture elements. Each picture element includes: first and second pixels each including a light-emitting element which has a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more; third and fourth pixels each including a light-emitting element which has a chromaticity whose y-coordinate in the diagram is 0.55 or more; and fifth and sixth pixels each including a light-emitting element which has a chromaticity whose x-coordinate and y-coordinate in the diagram are 0.20 or less and 0.25 or less, respectively. The light-emitting elements in the first and second pixels have different emission spectrums from each other; the light-emitting elements in the third and fourth pixels have different emission spectrums from each other; and the light-emitting elements in the fifth and sixth pixels have different emission spectrums from each other.

Claims

1. A display device comprising:

a plurality of pixels comprising;

a first pixel and a second pixel each comprising a light-emitting element, the light-emitting element having a chromaticity whose x-coordinate in a CIE-XY chromaticity diagram is 0.50 or more;

a third pixel and a fourth pixel each comprising a light-emitting element, the light-emitting element having a chromaticity whose y-coordinate in the CIE-XY chromaticity diagram is 0.55 or more; and

a fifth pixel comprising a light-emitting element, the light-emitting element having a chromaticity whose x-coordinate and y-coordinate in the CIE-XY chromaticity diagram are 0.20 or less and 0.35 or less, respectively,

wherein an area of the third pixel is larger than an area of the second pixel,

wherein an area of the fifth pixel is larger than the area of the third pixel,

wherein the first pixel and the second pixel are arranged in a first row in a first direction,

wherein the third pixel and the fourth pixel are arranged in a second row in the first direction,

wherein the fifth pixel is arranged in a third row,

wherein the first row is adjacent to the second row,

wherein the second row is adjacent to the third row,

wherein the first pixel is adjacent to the second pixel,

wherein the third pixel is adjacent to the fourth pixel,

wherein a length of a gap between the third pixel and the fourth pixel is larger than a length of a gap between the first pixel and the second pixel,

wherein an entirety of the gap between the third pixel and the fourth pixel overlaps with the fifth pixel in a second direction, and

wherein the first direction and the second direction are orthogonal to each other.

2. The display device according to claim 1,

wherein a thickness of the light-emitting element in the first pixel is different from a thickness of the light-emitting element in the second pixel, and

wherein a thickness of the light-emitting element in the third pixel is different from a thickness of the light-emitting element in the fourth pixel.

3. The display device according to claim 1,

wherein an emission spectrum of the first pixel is different from an emission spectrum of the second pixel, and

wherein an emission spectrum of the third pixel is different from an emission spectrum of the fourth pixel.

4. The display device according to claim 1,

wherein the first pixel and the second pixel emit light with colors of different coordinates in the CIE-XY chromaticity diagram, and

wherein the third pixel and the fourth pixel emit light with colors of different coordinates in the CIE-XY chromaticity diagram.

5. The display device according to claim 1,

wherein an area of a light-emitting region of the first pixel is different from an area of a light-emitting region of the second pixel, and

wherein an area of a light-emitting region of the third pixel is different from an area of a light-emitting region of the fourth pixel.

6. The display device according to claim 1, wherein the light-emitting element is an electroluminescence element.

7. The display device according to claim 1, further comprising a substrate,

wherein the plurality of pixels are over the substrate, and

wherein the substrate is a flexible substrate.

8. A display module comprising the display device according to claim 1, comprising at least one of an FPC and a housing.

9. An electronic device comprising the display module according to claim 8, comprising at least one of a display portion, a battery, an antenna, a speaker and an operating key.

10. An electronic device comprising the display device according to claim 1, wherein the electronic device is selected from a group consisting of a video camera, a digital camera, a goggle display, a navigation system, an audio reproducing device, a computer, a game machine, a mobile computer, a mobile phone, a portable game machine, an electronic book, and an image reproducing device.

17. The display device according to claim 1, further comprising a substrate,

wherein the plurality of pixels are over the substrate, and

wherein the substrate is a flexible substrate.

11. A display device comprising:

a plurality of pixels comprising;

a first pixel and a second pixel each comprising a light-emitting element, the light-emitting element having a chromaticity whose x-coordinate and y-coordinate in a CIE-XY chromaticity diagram are 0.6 or more and 0.35 or less, respectively;

a third pixel and a fourth pixel each comprising a light-emitting element, the light-emitting element having a chromaticity whose x-coordinate and y-coordinate in the CIE-XY chromaticity diagram are 0.3 or less and 0.6 or more, respectively; and

a fifth pixel comprising a light-emitting element, the light-emitting element having a chromaticity whose x-coordinate and y-coordinate in the CIE-XY chromaticity diagram are 0.15 or less and 0.2 or less, respectively,

wherein an area of the third pixel is larger than an area of the second pixel,

wherein an area of the fifth pixel is larger than the area of the third pixel,

wherein the first pixel and the second pixel are arranged in a first row in a first direction,

wherein the third pixel and the fourth pixel are arranged in a second row in the first direction,

wherein the fifth pixel is arranged in a third row,

wherein the first row is adjacent to the second row,

wherein the second row is adjacent to the third row,

wherein the first pixel is adjacent to the second pixel,

wherein the third pixel is adjacent to the fourth pixel,

wherein a length of a gap between the third pixel and the fourth pixel is larger than a length of a gap between the first pixel and the second pixel,

wherein an entirety of the gap between the third pixel and the fourth pixel overlaps with the fifth pixel in a second direction, and

wherein the first direction and the second direction are orthogonal to each other.

12. The display device according to claim 11,

wherein a thickness of the light-emitting element in the first pixel is different from a thickness of the light-emitting element in the second pixel, and

wherein a thickness of the light-emitting element in the third pixel is different from a thickness of the light-emitting element in the fourth pixel.

13. The display device according to claim 11,

wherein an emission spectrum of the first pixel is different from an emission spectrum of the second pixel, and

wherein an emission spectrum of the third pixel is different from an emission spectrum of the fourth pixel.

14. The display device according to claim 11,

wherein the first pixel and the second pixel emit light with colors of different coordinates in the CIE-XY chromaticity diagram, and

wherein the third pixel and the fourth pixel emit light with colors of different coordinates in the CIE-XY chromaticity diagram.

15. The display device according to claim 11,

wherein an area of a light-emitting region of the first pixel is different from an area of a light-emitting region of the second pixel, and

wherein an area of a light-emitting region of the third pixel is different from an area of a light-emitting region of the fourth pixel.

16. The display device according to claim 11, wherein the light-emitting element is an electroluminescence element.

18. A display module comprising the display device according to claim 11, comprising at least one of an FPC and a housing.

19. An electronic device comprising the display module according to claim 18, comprising at least one of a display portion, a battery, an antenna, a speaker and an operating key.

20. An electronic device comprising the display device according to claim 11, wherein the electronic device is selected from a group consisting of a video camera, a digital camera, a goggle display, a navigation system, an audio reproducing device, a computer, a game machine, a mobile computer, a mobile phone, a portable game machine, an electronic book, and an image reproducing device.