Abstract: A display panel includes a circuit layer and a display element layer that includes light emitting elements emitting white light, wherein the light emitting elements each include a first electrode, an optical auxiliary layer on the first electrode, a conductive layer on the optical auxiliary layer, a hole transport region on the conductive layer, a first light emitting layer on the hole transport region and emitting first light, a light emitting auxiliary unit on the first light emitting layer, a second light emitting layer on the light emitting auxiliary unit and generating second light, a third light emitting layer either between the first light emitting layer and the light emitting auxiliary unit or between the light emitting auxiliary unit and the second light emitting layer and generating third light, an electron transport region on the second light emitting layer, and a second electrode on the electron transport region.

Abstract: Provided is a display panel including a circuit layer and a display element layer above the circuit layer. The display element layer may include a first light-emitting element, a second light-emitting element, and a pixel-defining film that are spaced apart in a direction perpendicular to the thickness direction. The first light-emitting element may include an optical auxiliary layer and a conductive layer sequentially stacked between the first electrode and the hole transport region, and the second light-emitting element may omit the optical auxiliary layer and the conductive layer. The optical auxiliary layer may be spaced apart from the hole transport region with the conductive layer interposed therebetween.

Abstract: A mask inspection method including the steps of obtaining an image of a mask including a first region having a plurality of first openings, and a second region having a plurality of second openings, sectioning the image into a first partial image corresponding to the first region and a second partial image corresponding to the second region, respectively, inspecting the first region of the mask based on the first partial image, and inspecting the second region of the mask based on the second partial image.

Abstract: A display device including a base layer including a first pixel area configured to emit a first light therefrom and a second pixel area configured to emit a second light therefrom, a first electrode on the base layer, a second electrode on the first electrode and facing the first electrode, first light emitting stacks between the first and second electrodes and in the first pixel area, a first charge generation layer between the first light emitting stacks, second light emitting stacks between the first and second electrodes and in the second pixel area, and a second charge generation layer between the second light emitting stacks. The first charge generation layer includes a first metal, the second charge generation layer includes a second metal different from the first metal, and the second metal has a work function equal to or greater than 1.7 eV and equal to or smaller than 3.2 eV.

Abstract: A mask inspection method includes photographing a cell mask through which openings is formed to obtain an image, setting an area of the image adjacent to an edge of the cell mask as an inspection area, comparing a grayscale of the openings in the inspection area with a reference grayscale, and checking a defect of the cell mask according to a result of the comparing of the grayscale of the openings.

Abstract: A mask inspection method including the steps of obtaining an image of a mask including a first region having a plurality of first openings, and a second region having a plurality of second openings, sectioning the image into a first partial image corresponding to the first region and a second partial image corresponding to the second region, respectively, inspecting the first region of the mask based on the first partial image, and inspecting the second region of the mask based on the second partial image.