A display device, comprising: a substrate; and a plurality of display units on the substrate; wherein each of the plurality of display units comprises: a first color sub-pixel, comprising a first quantum dot material and a first light source located in a first isolating channel, wherein the first color sub-pixel is configured to provide a first color light by stimulating the first quantum dot material with the first light source; a second color sub-pixel, comprising a second quantum dot material and a second light source located in a second isolating channel, wherein the second color sub-pixel is configured to provide a second color light by stimulating the second quantum dot material with the second light source; and wherein each light source is a light emitting diode, characterised in that each of the first isolating channel and the second isolating channel comprises an isolating wall perpendicular to the substrate and an isolating layer parallel to the substrate, and the isolating wall and the isolating layer are integrated, and wherein the first isolating channel and the second isolating channel are for optical isolating the first color sub-pixel and the second color sub-pixel from each other. a plurality of display units on the substrate; wherein each of the plurality of display units comprises: a first color sub-pixel, comprising a first quantum dot material and a first light source located in a first isolating channel, wherein the first color sub-pixel is configured to provide a first color light by stimulating the first quantum dot material with the first light source; a second color sub-pixel, comprising a second quantum dot material and a second light source located in a second isolating channel, wherein the second color sub-pixel is configured to provide a second color light by stimulating the second quantum dot material with the second light source; and wherein each light source is a light emitting diode, characterised in that each of the first isolating channel and the second isolating channel comprises an isolating wall perpendicular to the substrate and an isolating layer parallel to the substrate, and the isolating wall and the isolating layer are integrated, and wherein the first isolating channel and the second isolating channel are for optical isolating the first color sub-pixel and the second color sub-pixel from each other. a first color sub-pixel, comprising a first quantum dot material and a first light source located in a first isolating channel, wherein the first color sub-pixel is configured to provide a first color light by stimulating the first quantum dot material with the first light source; a second color sub-pixel, comprising a second quantum dot material and a second light source located in a second isolating channel, wherein the second color sub-pixel is configured to provide a second color light by stimulating the second quantum dot material with the second light source; and wherein each light source is a light emitting diode, characterised in that each of the first isolating channel and the second isolating channel comprises an isolating wall perpendicular to the substrate and an isolating layer parallel to the substrate, and the isolating wall and the isolating layer are integrated, and wherein the first isolating channel and the second isolating channel are for optical isolating the first color sub-pixel and the second color sub-pixel from each other.