A display device having a light-emitting side and a non-light-emitting side, comprising: a light-emitting layer; a quantum dot sealant layer covering the light emitting layer on the light-emitting side of the display device, wherein the quantum dot sealant layer comprises red quantum dots for emitting red light; and a first electrode and a substrate, wherein: the first electrode is on the light emitting layer at the light emitting side, the substrate is at the light-emitting side, and the quantum dot sealant layer is between the light-emitting layer and the substrate; and the display device further comprises a dual brightness enhancement film between the light-emitting layer and the quantum dot sealant layer, the dual brightness enhancement film comprising a light-refracting layer, a light-scattering layer, and a light-condensing layer, wherein: the light-refracting layer is disposed on a side of the first electrode which is facing away from the light-emitting layer and transmits light emitted by the light-emitting layer through and reflects light emitted by the quantum dot sealant layer; the light-scattering layer scatters light transmitted through the light-refracting layer, the light-scattering layer being disposed on a side of the light-refracting layer that is facing away from the light-emitting layer; and the light-condensing layer condenses light transmitted through the light-scattering layer, the light-condensing layer being disposed on a side of the light-scattering layer that is facing the quantum dot sealant layer. a light-emitting layer; a quantum dot sealant layer covering the light emitting layer on the light-emitting side of the display device, wherein the quantum dot sealant layer comprises red quantum dots for emitting red light; and a first electrode and a substrate, wherein: the first electrode is on the light emitting layer at the light emitting side, the substrate is at the light-emitting side, and the quantum dot sealant layer is between the light-emitting layer and the substrate; and the display device further comprises a dual brightness enhancement film between the light-emitting layer and the quantum dot sealant layer, the dual brightness enhancement film comprising a light-refracting layer, a light-scattering layer, and a light-condensing layer, wherein: the light-refracting layer is disposed on a side of the first electrode which is facing away from the light-emitting layer and transmits light emitted by the light-emitting layer through and reflects light emitted by the quantum dot sealant layer; the light-scattering layer scatters light transmitted through the light-refracting layer, the light-scattering layer being disposed on a side of the light-refracting layer that is facing away from the light-emitting layer; and the light-condensing layer condenses light transmitted through the light-scattering layer, the light-condensing layer being disposed on a side of the light-scattering layer that is facing the quantum dot sealant layer. the first electrode is on the light emitting layer at the light emitting side, the substrate is at the light-emitting side, and the quantum dot sealant layer is between the light-emitting layer and the substrate; and the display device further comprises a dual brightness enhancement film between the light-emitting layer and the quantum dot sealant layer, the dual brightness enhancement film comprising a light-refracting layer, a light-scattering layer, and a light-condensing layer, wherein: the light-refracting layer is disposed on a side of the first electrode which is facing away from the light-emitting layer and transmits light emitted by the light-emitting layer through and reflects light emitted by the quantum dot sealant layer; the light-scattering layer scatters light transmitted through the light-refracting layer, the light-scattering layer being disposed on a side of the light-refracting layer that is facing away from the light-emitting layer; and the light-condensing layer condenses light transmitted through the light-scattering layer, the light-condensing layer being disposed on a side of the light-scattering layer that is facing the quantum dot sealant layer. the light-refracting layer is disposed on a side of the first electrode which is facing away from the light-emitting layer and transmits light emitted by the light-emitting layer through and reflects light emitted by the quantum dot sealant layer; the light-scattering layer scatters light transmitted through the light-refracting layer, the light-scattering layer being disposed on a side of the light-refracting layer that is facing away from the light-emitting layer; and the light-condensing layer condenses light transmitted through the light-scattering layer, the light-condensing layer being disposed on a side of the light-scattering layer that is facing the quantum dot sealant layer.