Display apparatus

A display apparatus comprising:

• an image forming device which emits an image light;
• a first light guide member which has a first light incidence portion and a first light emission portion;
• a first diffractive optical element provided in the first light emission portion;
• a second light guide member which has a second light incidence portion and a second light emission portion, the second light guide member provided over the first light guide member;
• a second diffractive optical element provided in the second light emission portion;
• and
• a first external light noise reduction element provided over the second light guide member,
• wherein
• the first external light noise reduction element is overlapped with the first light emission portion and the second light emission portion,
• the first light incidence portion is overlapped with the second light incidence portion,
• the image light is incident on the first light incidence portion, a part of the image light is guided in the first light guide member, and another part of the image light is incident on the second light incidence portion and is guided in the second light guide member,
• external light passes through the first external light noise reduction element, the second light emission portion, and the first light emission portion,
• the external light includes a first polarized light and a second polarized light, of which a polarization direction is different from the first polarized light, and
• a diffraction efficiency of the first polarized light in the first diffractive optical element is lower than a diffraction efficiency of the second polarized light in the first diffractive optical element, and the diffraction efficiency of the second polarized light gradually decreases as an incident angle of the second polarized light on the first diffractive optical element increases.