Abstract: A display device includes a first substrate, a plurality of light-emitting diodes, a first wavelength conversion layer and a metasurface. The light-emitting diodes are arranged on the first substrate, in which the light-emitting diodes emit a first color light, and the light-emitting diodes includes a first light-emitting diode, a second light-emitting diode and a third light-emitting diode. The first wavelength conversion layer is on the first light-emitting diode, and configured to convert the first color light emitted from the first light-emitting diode into a second color light, in which the second color light is different from the first color light. The metasurface is above the first wavelength conversion layer, and configured to reflect the first color light and pass the second color light.

Abstract: A system for testing a flat panel display device includes a support plate and an electrical connector set. The support plate includes a plate body having a through hole, and is adapted to support the display device thereon such that a screen of the display device faces an upper surface of the plate body. The electrical connector set is mounted on the support plate, and is adapted to connect electrically with the display device on the support plate so as to enable activation of the display device to radiate light from the screen of the display device through the through hole. One of a light-directing component and an image-capturing unit is disposed under and is spaced apart from the support plate, to receive the light from the display device that passes through the through hole.