Display device

1. A display device comprising a plurality of pixels formed of three or more sub pixels,

wherein, as the three or more sub pixels, each of the pixels includes

a first sub pixel including a first light source that emits light having a first wavelength,

a second sub pixel including a second light source that emits light having the first wavelength and a first wavelength conversion unit that converts the light having the first wavelength emitted from the second light source into light having a second wavelength, the second sub pixel being arranged adjacent to the first sub pixel, and

a third sub pixel including a third light source that emits light having the first wavelength and a second wavelength conversion unit that converts the light having the first wavelength emitted from the third light source into light having a third wavelength, the third sub pixel being arranged adjacent to the second sub pixel,

wherein the display device further comprises a first layer that reflects the light having the first wavelength and transmits the light having the second wavelength and the light having the third wavelength,

wherein the first layer has a size that covers a surface of the first wavelength conversion unit on a side that emits the light having the second wavelength and a surface of the second wavelength conversion unit on a side that emits the light having the third wavelength, and faces at most a part of the first light source, and

wherein, of two close side surfaces of the first layer, which are arranged closer to the first sub pixel than an other side surface, at least one of the close side surfaces is inclined toward the second sub pixel arranged closest to the at least one of the close side surfaces or toward the third sub pixel arranged closest to the at least one of the close side surfaces.

2. The display device according to claim 1 ,

wherein at least a part of the first layer has a structure in which two or more types of functional layers are laminated, and

wherein the two or more types of functional layers have different refractive indexes with respect to the light having the first wavelength.

3. The display device according to claim 2 ,

wherein the first layer has

a first part at which the two or more types of functional layers are laminated in a direction perpendicular to a surface of the first layer opposite to a back surface facing the first wavelength conversion unit and the second wavelength conversion unit, and

a second part at which the two or more types of functional layers, which reflect the light having the first wavelength and transmit the light having the second wavelength and the light having the third wavelength, are laminated in a direction perpendicular to an inclination direction of an inclined side surface which is the at least one of the close side surfaces inclined toward the second sub pixel or the third sub pixel.

4. The display device according to claim 2 ,

wherein, an end portion of the first layer, including an inclined side surface which is the at least one of the close side surfaces inclined toward the second sub pixel or the third sub pixel

faces a part of the first light source, and

has a structure in which the two or more types of functional layers that reflect the light having the first wavelength and transmit the light having the second wavelength and the light having the third wavelength are laminated, and

wherein, at the end portion, a number of laminated layers of the two or more types of functional layers decreases as going toward a tip end part from a part closest to a center of the first layer.

5. A display device comprising a plurality of pixels formed of three or more sub pixels,

wherein, as the three or more sub pixels, each of the pixels includes

a first sub pixel including a first light source that emits light having a first wavelength,

a second sub pixel including a second light source that emits light having the first wavelength and a first wavelength conversion unit that converts the light having the first wavelength emitted from the second light source into light having a second wavelength, the second sub pixel being arranged adjacent to the first sub pixel, and

a third sub pixel including a third light source that emits light having the first wavelength and a second wavelength conversion unit that converts the light having the first wavelength emitted from the third light source into light having a third wavelength, the third sub pixel being arranged adjacent to the second sub pixel,

wherein the display device further comprises a first layer that reflects the light having the first wavelength and transmits the light having the second wavelength and the light having the third wavelength,

wherein the first layer has a size that covers a surface of the first wavelength conversion unit on a side that emits the light having the second wavelength and a surface of the second wavelength conversion unit on a side that emits the light having the third wavelength, and faces at most a part of the first light source,

wherein the first sub pixel has a second layer that scatters or transmits the light having the first wavelength emitted from the first light source,

wherein at least one of the first wavelength conversion unit and the second wavelength conversion unit is projected in an emitting direction of the light having the second wavelength further than the second layer, and

wherein, in the at least one of the first wavelength conversion unit and the second wavelength conversion unit, a side surface of a part projecting in the emitting direction of the light having the second wavelength further than the second layer is covered with the first layer.

6. The display device according to claim 1 ,

wherein a surface of the first layer other than a back surface facing the first wavelength conversion unit and the second wavelength conversion unit is covered with a passivation film.

7. The display device according to claim 1 ,

wherein a side surface of the first wavelength conversion unit and a side surface of the second wavelength conversion unit are covered with a first reflection layer that reflects the light having the second wavelength and the light having the third wavelength.

8. The display device according to claim 1 ,

wherein a back surface of the first wavelength conversion unit facing the second light source and a back surface of the second wavelength conversion unit facing the third light source are covered with a second reflection layer that reflects the light having the second wavelength and the light having the third wavelength.

9. A display device comprising a plurality of pixels formed of three or more sub pixels,

wherein, as the three or more sub pixels, each of the pixels includes

a first sub pixel including a light source that emits light having a first wavelength,

a second sub pixel including the light source and a first wavelength conversion unit that converts the light having the first wavelength emitted from the light source into light having a second wavelength, the second sub pixel being arranged adjacent to the first sub pixel, and

a third sub pixel including the light source and a second wavelength conversion unit that converts the light having the first wavelength emitted from the light source into light having a third wavelength, the third sub pixel being arranged adjacent to the second sub pixel,

wherein the display device further comprises a first layer that reflects the light having the first wavelength and transmits the light having the second wavelength and the light having the third wavelength,

wherein the first layer has a size that covers a surface of the first wavelength conversion unit on a side that emits the light having the second wavelength and a surface of the second wavelength conversion unit on a side that emits the light having the third wavelength, and faces at most a part of the light source of the first sub pixel, and

wherein, of two close side surfaces of the first layer, which are arranged closer to the first sub pixel than an other side surface, at least one of the close side surfaces is inclined toward the second sub pixel arranged closest to the at least one of the close side surfaces or toward the third sub pixel arranged closest to the at least one of the close side surfaces.