A display device comprising: a display panel (210, 410); a guide panel (225, 425) coupled to a surface of the display panel (210, 410) via an attaching member (250, 450), the guide panel (225, 425) including: a body portion (225a, 425a) facing the surface of the display panel (210, 410) in a first direction, a first light shielding portion protruding from the body portion (225a, 425a) in the first direction towards the surface of the display panel (210, 410), the first light shielding portion closer to a center of the display panel (210, 410) than the attaching member (250, 450), a first fastening portion (225c, 425b) protruding from the body portion (225a, 425a) in a second direction away from the first direction, and a second fastening portion (225b, 425c) protruding from the body portion (225a, 425a) in the second direction; and a cover (260, 440) including: a planar surface facing the display panel (210, 410) in the first direction, and a side surface part (260b, 440a) protruding from the planar surface towards the first direction, the side surface part (260b, 440a) inserted between the first fastening portion (225c, 425b) and the second fastening portion (225b, 425c), characterised in that the attaching member (250, 450) is configured to pass through, between the display panel (210, 410) and the guide panel (225, 425), to an exterior of the display device a portion of light corresponding to a predetermined wavelength, and to filter another portion of the light corresponding to another wavelength. a display panel (210, 410); a guide panel (225, 425) coupled to a surface of the display panel (210, 410) via an attaching member (250, 450), the guide panel (225, 425) including: a body portion (225a, 425a) facing the surface of the display panel (210, 410) in a first direction, a first light shielding portion protruding from the body portion (225a, 425a) in the first direction towards the surface of the display panel (210, 410), the first light shielding portion closer to a center of the display panel (210, 410) than the attaching member (250, 450), a first fastening portion (225c, 425b) protruding from the body portion (225a, 425a) in a second direction away from the first direction, and a second fastening portion (225b, 425c) protruding from the body portion (225a, 425a) in the second direction; and a body portion (225a, 425a) facing the surface of the display panel (210, 410) in a first direction, a first light shielding portion protruding from the body portion (225a, 425a) in the first direction towards the surface of the display panel (210, 410), the first light shielding portion closer to a center of the display panel (210, 410) than the attaching member (250, 450), a first fastening portion (225c, 425b) protruding from the body portion (225a, 425a) in a second direction away from the first direction, and a second fastening portion (225b, 425c) protruding from the body portion (225a, 425a) in the second direction; and a cover (260, 440) including: a planar surface facing the display panel (210, 410) in the first direction, and a side surface part (260b, 440a) protruding from the planar surface towards the first direction, the side surface part (260b, 440a) inserted between the first fastening portion (225c, 425b) and the second fastening portion (225b, 425c), a planar surface facing the display panel (210, 410) in the first direction, and a side surface part (260b, 440a) protruding from the planar surface towards the first direction, the side surface part (260b, 440a) inserted between the first fastening portion (225c, 425b) and the second fastening portion (225b, 425c), characterised in that the attaching member (250, 450) is configured to pass through, between the display panel (210, 410) and the guide panel (225, 425), to an exterior of the display device a portion of light corresponding to a predetermined wavelength, and to filter another portion of the light corresponding to another wavelength.