Head-mounted display apparatus
A head-mounted display apparatus includes a control unit configured to correct a video, a display element configured to display the video corrected by the control unit, a first optical member on which video light corresponding to the video is incident, and a reflection member configured to reflect the video light from the first optical member to project a virtual image corresponding to the video. The first optical member and the reflection member correct distortion of the virtual image in a first direction. The control unit corrects the video based on distortion of the virtual image in a second direction crossing the first direction.
1. A head-mounted display apparatus comprising:
a circuit configured to function as a control unit that corrects a video;
a display element configured to display the video corrected by the control unit;
a first optical member on which video light corresponding to the video is incident; and
a reflection member configured to reflect the video light from the first optical member to project a virtual image corresponding to the video, wherein
the first optical member and the reflection member correct distortion of the virtual image in a first direction,
the control unit corrects the video based on distortion of the virtual image in a second direction crossing the first direction, and
the control unit corrects the video to satisfy the following equation:
U=ax+bxy
where y represents a coordinate of the video before correction in the first direction, x represents a coordinate of the video before the correction in the second direction, U represents a coordinate of the video after the correction in the second direction, a represents a coefficient corresponding to a length of the video after the correction in the second direction, and b represents a coefficient corresponding to an angle formed between sides of the video after the correction in the first direction and the second direction.
2. The head-mounted display apparatus according to claim 1 , wherein the second direction is a direction corresponding to a scanning direction of the display element.
3. The head-mounted display apparatus according to claim 2 , wherein the control unit corrects the video to make a length of the video in the second direction on one side in the first direction shorter than a length of the video in the second direction on another side in the first direction.
4. The head-mounted display apparatus according to claim 1 , wherein
the control unit corrects the video to satisfy the following equation:
U=ax+bxy+cy
where c represents a coefficient corresponding to distortion of inclination of the video after the correction on one side in the second direction and inclination of the video after the correction on another side in the second direction.
5. The head-mounted display apparatus according to claim 4 , wherein the coefficient a, the coefficient b, and the coefficient c are rewritable parameters.
6. The head-mounted display apparatus according to claim 1 , wherein
the display element displays a first video including a first wavelength, a second video including a second wavelength shorter than the first wavelength, and a third video including a third wavelength longer than the first wavelength,
a length of the first video in the second direction is a length between a length of the second video in the second direction and a length of the third video in the second direction, and
a length of the first video in the first direction is the same as a length of the second video in the first direction and a length of the third video in the first direction.
7. The head-mounted display apparatus according to claim 1 , wherein
the video after the correction includes a first corrected region after the correction obtained by correcting a first region of the video before the correction and a second corrected region after the correction obtained by correcting a second region of the video before the correction, the second region and the first region being arranged side by side in the second direction, and
the number of pixels in the second direction in the first corrected region after the correction is within ±10% of the number of pixels in the second direction in the second corrected region after the correction.
8. The head-mounted display apparatus according to claim 1 , wherein the reflection member is provided with an angle θ1, formed between the video light incident on the reflection member from the first optical member and the video light reflected to a position of a pupil by the reflection member, satisfying 10°≤θ1≤70°.
9. The head-mounted display apparatus according to claim 1 , wherein
the first optical member includes:
an incident portion on which the video light from the display element is incident,
an emission portion from which the incident video light is emitted toward the reflection member, and
a reflection portion from which the video light incident from the incident portion is reflected toward the emission portion.
10. The head-mounted display apparatus according to claim 9 , wherein the first optical member is provided with an angle θ2, formed between the video light incident on the reflection portion and the video light reflected by the reflection portion, satisfying 30°≤θ2≤90°.
11. The head-mounted display apparatus according to claim 9 , wherein
a distance Ln from a pupil to the first optical member in a horizontal direction satisfies the following equation:
Ln=L 2 cos θ3− L 1 cos(θ3+θ1)
where θ3 represents an angle formed between the horizontal direction and the video light reflected by the reflection member to a position of the pupil, L1 represents an optical path length of the video light incident on the reflection member from the first optical member, and L2 represents an optical path length of the video light reflected by the reflection member to the position of the pupil.
12. The head-mounted display apparatus according to claim 9 , wherein the display element is provided with an angle θ4, formed between a horizontal direction and the video light incident on the reflection portion of the first optical member, satisfying θ4≤ 10°.
13. The head-mounted display apparatus according to claim 1 , further comprising a second optical member disposed between the first optical member and the display element.
14. The head-mounted display apparatus according to claim 1 , further comprising:
a supporting member supporting the display element, the first optical member, and the reflection member; and
a mounted member coupled to the supporting member and mounted to a head of a user.
15. A head-mounted display apparatus comprising:
a circuit configured to function as a control unit that corrects a video;
a display element configured to display the video corrected by the control unit;
a first optical member on which video light corresponding to the video is incident; and
a reflection member configured to reflect the video light from the first optical member to project a virtual image corresponding to the video, wherein
the first optical member and the reflection member correct distortion of the virtual image in a first direction,
the control unit corrects the video based on distortion of the virtual image in a second direction crossing the first direction,
the display element displays a first video including a first wavelength, a second video including a second wavelength shorter than the first wavelength, and a third video including a third wavelength longer than the first wavelength,
a length of the first video in the second direction is a length between a length of the second video in the second direction and a length of the third video in the second direction, and
a length of the first video in the first direction is the same as a length of the second video in the first direction and a length of the third video in the first direction.