US 11,991,345 B2
Virtual image display device and head mounted display using same
Kunikazu Oonishi, Tokyo (JP); and Seiji Murata, Tokyo (JP)
Assigned to MAXELL, LTD., Kyoto (JP)
Filed by Maxell, Ltd., Kyoto (JP)
Filed on Jan. 26, 2022, as Appl. No. 17/584,647.
Application 17/584,647 is a continuation of application No. 16/758,437, granted, now 11,297,304, previously published as PCT/JP2018/040257, filed on Oct. 30, 2018.
Claims priority of application No. 2017-212339 (JP), filed on Nov. 2, 2017.
Prior Publication US 2022/0150466 A1, May 12, 2022
Int. Cl. H04N 13/383 (2018.01); G02B 27/01 (2006.01); G02B 27/10 (2006.01); H04N 13/117 (2018.01); H04N 13/344 (2018.01)
CPC H04N 13/383 (2018.05) [G02B 27/0101 (2013.01); G02B 27/0172 (2013.01); G02B 27/0179 (2013.01); G02B 27/10 (2013.01); H04N 13/117 (2018.05); H04N 13/344 (2018.05); G02B 2027/0129 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01); G02B 2027/0185 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A virtual image display device comprising:
a first display and a second display configured to respectively generate a first virtual image light and a second virtual image light in which visual recognition distances are different;
a projector configured to project the first virtual image light and the second virtual image light to left and right eyes of the user so that the user visually recognizes each of a long distance reference virtual image and a short distance reference virtual image; and
a controller configured to:
control a position and a size of the first virtual image light and the second virtual image light so that the long distance reference virtual image and the short distance reference virtual image which are visually recognized by the user are overlapped, and
control a ratio of luminance of the long distance reference virtual image and the short distance reference virtual image according to a visual recognition distance of a visually-recognized-virtual image based on the long distance reference virtual image and the short distance reference visual image, a visual recognition distance of the long distance reference virtual image, and a visual recognition distance of the short distance reference virtual image,
wherein, in a case where the visual recognition distance of the visually-recognized-virtual image is set as D0, a luminance of the visually-recognized-virtual image is set as V0, the visual recognition distance of the long distance reference virtual image is set as DL, a luminance of the long distance reference virtual image is set as VL, the visual recognition distance of the short distance reference virtual image is set as DS, and a luminance of the short distance reference virtual image is set as VS, the controller controls a ratio of the luminance of the long distance reference virtual image and the luminance of the short distance reference virtual image based on the following formulas:
VL=V0*(D0−DS)/(DL−DS); and
VS=V0*(DL−D0)/(DL−DS).