US-12619082-B2 - Display apparatus

US12619082B2US 12619082 B2US12619082 B2US 12619082B2US-12619082-B2

Abstract

A display apparatus including display system and imaging systems for left-eye and right-eye and displaying an image of outside acquired by each of the imaging systems, the display system comprises display element, and optical element comprising incident surface, two reflection surfaces and exit surface. The display apparatus comprises limiting unit limiting light beam width so that light beam entering second pupil located behind the exit pupil does not satisfy diameter of the second pupil. When the second pupil is set at a position on an optical axis 10 mm away on an opposite side of the optical element with respect to the exit pupil, the limiting unit limits the light beam width such that at least a part of the light beam of an outermost peripheral angle of view on an outer side in the horizontal direction does not reach an evaluation pupil diameter of the second pupil.

Inventors

Kazutaka Inoguchi

Assignees

CANON KABUSHIKI KAISHA

Dates

Publication Date: 20260505
Application Date: 20240826
Priority Date: 20230830

Claims (10)

1 . A display apparatus including a display system and imaging systems for a left-eye and a right-eye arranged on an outside of the display system, and configured to display an image of the outside acquired by each of the imaging systems at substantially equal magnification on the display system, the display system comprising: a display element, and an optical element comprising an incident surface, two reflection surfaces and an exit surface, wherein the optical element is configured such that light emitted from a central position of the display element enters the optical element from the incident surface, is reflected by the two reflection surfaces so as to be directed outward in a horizontal direction while being folded in a visual axis direction, is emitted from the exit surface, and is guided to an exit pupil of the optical element, wherein the display apparatus comprises a limiter configured to limit a light beam width so that a light beam entering a second pupil located behind the exit pupil does not satisfy a diameter of the second pupil, wherein when the second pupil is set at a position on an optical axis 10 mm away on an opposite side of the optical element with respect to the exit pupil as a reference, the limiter limits the light beam width such that at least a part of the light beam of an outermost peripheral angle of view on an outer side in the horizontal direction does not reach an inner side of an evaluation pupil diameter of the second pupil, and wherein a following conditional expression is satisfied: γ≤ω H/ 2 wherein ωH is a horizontal maximum angle of view displayed by the display element, and γ is a difference between ωH and the minimum angle of view incident on a center of the second pupil when the outside is directly observed.
2 . The display apparatus according to claim 1 , wherein the limiter limits the light beam width such that a part of the light beam of an outermost peripheral angle of view on an inner side in the horizontal direction does not reach the inner side of the evaluation pupil diameter of the second pupil.
3 . The display apparatus according to claim 1 , wherein the limiter limits the light beam width such that all of the light beam of an outermost peripheral angle of view on an outer side in the horizontal direction does not reach the inner side of the evaluation pupil diameter of the second pupil.
4 . The display apparatus according to claim 1 , wherein the limiter limits the light beam width such that all of the light beam of an outermost peripheral angle of view on an inner side in the horizontal direction does not reach the inner side of the evaluation pupil diameter of the second pupil.
5 . The display apparatus according to claim 1 , wherein the limiter limits the light beam width such that a part of the light beam of an outermost peripheral angle of view on an outer side in the horizontal direction does not reach an evaluation pupil diameter of the exit pupil of the optical element.
6 . The display apparatus according to claim 1 , wherein the limiter limits the light beam width such that a part of the light beam of an outermost peripheral angle of view on an inner side in the horizontal direction does not reach an evaluation pupil diameter of the exit pupil of the optical element.
7 . The display apparatus according to claim 1 , wherein the evaluation pupil diameter is 4 mm.
8 . The display apparatus according to claim 1 , wherein the optical element is a prism element having a decentered shape, and wherein the limiter has an end surface formed by cutting off at least one of two acute angle portions of the prism element.
9 . The display apparatus according to claim 1 , wherein the optical element is a prism element having a decentered shape, and wherein the limiter includes a light shielding film formed on a part of one of the reflection surfaces forming the prism element.
10 . The display apparatus according to claim 1 , wherein the optical element is a prism element having a decentered shape, and wherein the limiter includes a limiting portion that limits an area of a reflection film formed on the other of the reflection surfaces forming the prism element.

Description

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a display apparatus. Description of the Related Art A video see-through type head mounted display (HMD) used for mixed reality (MR), or augmented reality (AR) is known. In a video see-through type HMD, an outside image acquired by an imaging system is combined with a CG image, and the combined image is observed at a substantially equal magnification via a display system. In addition, there is a demand for an experience in which the surrounding outside of the video see-through type HMD is rarely shielded, and the MR space observed through the HMD and the outside coexist. Japanese Patent No. 3604979 discloses a technique in which an optical axis of an imaging system and an optical axis of a display system are made to substantially coincide with each other, and a distance between an incident pupil of the imaging system and an exit pupil of the display system is appropriately arranged, thereby reducing a sense of discomfort between the outside when the HMD is not worn and the outside viewed in a video see-through manner. Japanese Patent Application Laid-Open No. 2022-144445 discloses an image display apparatus provided with a small-sized optical system which gives little sense of discomfort to an observer when the observer observes an image of the outside. However, Japanese Patent No. 3604979 and Japanese Patent Application Laid-Open No. 2022-144445 do not disclose an experience in which the MR space observed through the HMD and the outside coexist. SUMMARY OF THE INVENTION The present disclosure has an object to provide a display apparatus capable of providing an experience in which MR space observed through HMD and the outside coexist. In order to achieve the above-mentioned object, according to the present disclosure, a display apparatus including a display system and imaging systems for a left-eye and a right-eye arranged on an outside of the display system, and configured to display an image of the outside acquired by each of the imaging systems at substantially equal magnification on the display system, the display system comprising: a display element, and an optical element comprising an incident surface, two reflection surfaces and an exit surface, wherein the optical element is configured such that light emitted from a central position of the display element enters the optical element from the incident surface, is reflected by the two reflection surfaces so as to be directed outward in a horizontal direction while being folded in a visual axis direction, is emitted from the exit surface, and is guided to an exit pupil of the optical element, wherein the display apparatus comprises a limiting unit configured to limit a light beam width so that a light beam entering a second pupil located behind the exit pupil does not satisfy a diameter of the second pupil, and wherein when the second pupil is set at a position on an optical axis 10 mm away on an opposite side of the optical element with respect to the exit pupil as a reference, the limiting unit limits the light beam width such that at least a part of the light beam of an outermost peripheral angle of view on an outer side in the horizontal direction does not reach an evaluation pupil diameter of the second pupil. Further features of the present invention will become apparent from the following description of exemplary embodiments with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of a main part of a display apparatus (100) according to an embodiment of the present disclosure. FIG. 2 is a schematic view of a main part of a display apparatus (101) according to a first example. FIG. 3A and FIG. 3B are views illustrating images acquired by a camera in which an optical system incident pupil is arranged at the position of the second pupil in the display apparatus (101) of the first example. FIG. 4 is a schematic view of a main part of a display apparatus (102) according to a second example. FIG. 5A and FIG. 5B are views illustrating images acquired by a camera in which an optical system incident pupil is arranged at the position of the second pupil in the display apparatus (102) of the second example. FIG. 6 is a schematic view of a main part of a display apparatus (103) according to a third example. FIG. 7 is a schematic view of a main part of a display apparatus (104) according to a fourth example. FIG. 8 is a schematic view of a main part of a display apparatus (105) according to a fifth example. FIG. 9 is a schematic view of a main part of a display apparatus (106) according to a sixth example. FIG. 10A and FIG. 10B are views illustrating images acquired by a camera in which an optical system incident pupil is arranged at the position of the second pupil in the display apparatus (106) of the sixth example. DESCRIPTION OF THE EMBODIMENTS Embodiment Preferred embodiments of the present invention will now be described in de