Display device manufacturing method, and display device

A manufacturing method for a display device, the display device comprising:

• a substrate having a display region in which a plurality of pixels are arranged, each pixel including a first subpixel, a second subpixel, a third subpixel, and a fourth subpixel,
• wherein the first subpixel and the second subpixel are arranged in an alternating manner in a first direction;
• the third subpixel and the fourth subpixel are arranged in an alternating manner in the first direction;
• a column constituted by the first subpixel and the second subpixel, and a column constituted by the third subpixel and the fourth subpixel, are arranged in an alternating manner in a second direction orthogonal to the first direction;
• in the first subpixel, a first fluorescent luminescent material emits light, and the light emitted from the first fluorescent luminescent material is emitted to the exterior;
• in the second subpixel and the third subpixel, a second fluorescent luminescent material emits light, and the light emitted from the second fluorescent luminescent material is emitted to the exterior;
• in the fourth subpixel, a third luminescent material emits light, and the light emitted from the third luminescent material is emitted to the exterior;
• the first fluorescent luminescent material emits light having a first peak wavelength;
• the second fluorescent luminescent material emits light having a second peak wavelength longer than the first peak wavelength;
• the third luminescent material emits light having a third peak wavelength longer than the second peak wavelength;
• and
• an energy level of the second fluorescent luminescent material in a minimum excited singlet state is lower than an energy level of the first fluorescent luminescent material in a minimum excited singlet state and higher than an energy level of the third luminescent material in a minimum excited singlet state,
• the method comprising:
• a function layer formation step of forming a plurality of function layers constituted by vapor deposition particles on the substrate by vapor-depositing vapor deposition particles corresponding to the respective function layers on the substrate through vapor deposition masks in which are formed a plurality of mask openings having predetermined opening patterns corresponding to the respective function layers,
• wherein the function layer formation step includes:
• a first light-emitting layer formation step of forming a first light-emitting layer containing the first fluorescent luminescent material in common for the first subpixel and the second subpixel;
• a second light-emitting layer formation step of forming a second light-emitting layer containing the second fluorescent luminescent material in common for the second subpixel and the third subpixel;
• a third light-emitting layer formation step of forming a third light-emitting layer containing the third luminescent material in common for the third subpixel and the fourth subpixel;
• and
• an intermediate layer formation step of forming an intermediate layer in the third subpixel, so that in the third subpixel, the second light-emitting layer and the third light-emitting layer are layered with the intermediate layer, constituted by at least one function layer aside from the light-emitting layers and having a thickness exceeding the Förster radius, being interposed therebetween, and
• in the function layer formation step:
• the first light-emitting layer and the second light-emitting layer are formed so that in the second subpixel, a distance between opposing surfaces of the first light-emitting layer and the second light-emitting layer is less than or equal to the Förster radius;
• and
• in at least two light-emitting layer formation steps among the first light-emitting layer formation step, the second light-emitting layer formation step, and the third light-emitting layer formation step, the vapor deposition particles are linearly deposited on the substrate using, as the vapor deposition mask, a slitted mask including slit-shaped mask openings provided so that the mask openings span a plurality of the pixels.