Display device and method of adjusting optical system of display device
A display device of the present disclosure includes an optical system, the optical system including an image light generation device configured to generate image light, a projection optical system including an optical element, the optical element including an optical surface asymmetric in a direction along at least a first axis of two axes orthogonal to each other and perpendicular to an optical axis of the image light, a support member configured to support the optical element, a first adjustment mechanism configured to adjust a position of the optical element in the direction along the first axis, and a second adjustment mechanism configured to adjust a position of an emission region of the image light in the direction along the first axis.
1. A display device comprising an optical system, the optical system including:
an image light generation device configured to generate image light;
a projection optical system including an optical element, the optical element being a single lens and including an optical surface asymmetric in a direction along at least a first axis of two axes orthogonal to each other and perpendicular to an optical axis of the image light;
a support member configured to support the optical element;
a first adjustment mechanism configured to adjust a position of the optical element in the direction along the first axis, and being in contact with the optical element and an inner surface of the support member; and
a second adjustment mechanism configured to adjust a position of an emission region of the image light in the direction along the first axis, and disposed outside the support member.
2. The display device according to claim 1 , wherein the second adjustment mechanism includes a device position adjustment mechanism configured to adjust a relative position of the image light generation device with respect to the optical element.
3. The display device according to claim 1 , wherein the second adjustment mechanism includes an emission position adjustment circuit configured to adjust a position of an image light emission region in an image light emittable region in the image light generation device.
4. The display device according to claim 1 , wherein the first adjustment mechanism includes an optical element position adjustment mechanism configured to adjust a relative position of the optical element with respect to the support member.
5. The display device according to claim 4 , wherein the optical element position adjustment mechanism includes a spacer provided between the optical element and the support member.
6. The display device according to claim 4 , wherein the optical element position adjustment mechanism includes a pressing member configured to move the optical element through the support member.
7. The display device according to claim 1 , wherein the optical system further includes a first diffraction element configured to guide the image light to an eye of an observer, and a chromatic aberration correction element configured to correct a chromatic aberration generated at the first diffraction element.
8. The display device according to claim 7 , wherein the chromatic aberration correction element is a second diffraction element configured to guide the image light to the first diffraction element.
9. The display device according to claim 8 , wherein at least a portion of the second diffraction element is disposed inside the support member.
10. The display device according to claim 1 , comprising a pair of the optical systems, wherein
the pair of the optical systems are constituted of a right-eye optical system configured to guide the image light to a right eye of an observer, and a left-eye optical system configured to guide the image light to a left eye of the observer.
11. A method of adjusting an optical system of a display device, the optical system including:
an image light generation device configured to generate image light;
a projection optical system including an optical element, the optical element being a single lens and including an optical surface asymmetric in a direction along at least a first axis of two axes orthogonal to each other and perpendicular to an optical axis of the image light;
a support member configured to support the optical element;
a first adjustment mechanism being in contact with the optical element and an inner surface of the support member; and
a second adjustment mechanism disposed outside the support member, the method comprising:
a first adjusting step of adjusting a position of the optical element in the direction along the first axis through the first adjustment mechanism; and
a second adjusting step of adjusting, after the first adjusting step, a position of an emission region of the image light in the direction along the first axis through the second adjustment mechanism.