TW201928445A - Head-mounted display apparatus - Google Patents

Abstract

A head-mounted display apparatus including at least one display and a transflective lens is provided. The at least one display is configured to emit an image beam. The transflective lens is disposed on a transmission path of the image beam, reflects a portion of the image beam to eyes of a user, and permits a portion of an object beam from the surrounding to penetrate and transmit to the eyes of the user. The at least one display is disposed above the transflective lens and the eyes. The transflective lens is bended in a horizontal direction parallel to a line between the two eyes of the user.

Description

Head mounted display device

The present invention relates to a display device, and more particularly to a head mounted display device.

As the weight and size of digital devices have decreased, various wearable devices have been developed. Among wearable devices, a head mounted display (HMD) device refers to a variety of digital devices that are worn by a user on the head and provide multimedia content to the user. In general, the HMD device can be embodied in any of a variety of forms worn on the head, such as glasses, helmets, and the like.

In a basic optical system in which an augmented reality (AR) is implemented by an HMD device, an image beam for display is emitted from a display and reflected by a transflective optical element into the user's eye. The image beam of the displayed image and the ambient light beam of the outside world enter the user's eyes, so the user can simultaneously see the virtual image in front of the eye and the image of the external environment, thereby achieving the display effect of the augmented reality. However, the current augmented reality optical system can display an image with a viewing angle range smaller than the viewing angle of the human eye, and the display may also appear in the viewing angle range of the user's eyes, affecting the visual experience of the user's viewing.

The invention provides a head mounted display device with a wider image viewing angle.

The head mounted display device of the present invention comprises at least one display and a transflective lens. At least one display is used to emit an image beam. The trans-optical lens is disposed on the transmission path of the image beam, and the trans-reflecting lens reflects part of the image beam to a user's eyes, and allows a part of the object beam from the outside to penetrate and transmit to the user's eyes, at least A display is placed over the trans-optical lens and the eye, and the trans-transparent lens is curved in a horizontal direction parallel to the user's two-eye line.

Based on the above, in the head-mounted display device of the embodiment of the present invention, a part of the image beam is reflected to a user's eyes due to the transversal lens, and the trans-optical lens is connected to the two-eye line parallel to the user. The horizontal direction is curved, so that part of the image beam can pass through the trans-optical lens to form an enlarged virtual image, thereby expanding the range of viewing angles that the user can view.

The above described features and advantages of the invention will be apparent from the following description.

1 is a side view of a head mounted display device in accordance with an embodiment of the present invention. Figure 2 is a cross-sectional view taken along line A-A' of Figure 1. Referring to FIG. 1 and FIG. 2, the head mounted display device 100 of the present embodiment includes at least one display 110 (exemplified by two displays 110a and 110b in FIG. 1) and a transflective lens 120. At least one display 110 is used to emit an image beam IB (shown in FIG. 2). The trans-optical lens 120 is disposed on the transmission path of the image beam IB, and the trans-optical lens 120 reflects part of the image beam IB to a user's eye 50, and allows the object beam OB from the outside (shown in FIG. 2). A portion of the penetration is transmitted to the user's eye 50, wherein at least one display 110 is disposed over the trans-optical lens 120 and the eye 50, and the trans-transparent lens 120 is connected at a level parallel to the user's two eyes 50. The direction (in the direction D1 in Fig. 1) is curved. In the present embodiment, the transflective lens 120 is a partially penetrating partial mirror, such as a transflective mirror.

In the present embodiment, the transflective lens 120 is curved toward the outside of the two eyes 50 of the user in the horizontal direction (direction D1 in FIG. 1). The curvature of the trans-transparent lens 120 that is curved in the horizontal direction is, for example, greater than 90 degrees and less than or equal to 220 degrees. In a preferred embodiment, the curvature of the transflective lens 120 in the horizontal direction is greater than 120 degrees and less than or equal to 220 degrees, but the invention is not limited thereto.

In the present embodiment, the transflective lens 120 can also be bent in the vertical direction (direction D2 in FIG. 1). Here, for all points on the surface 122 of the trans-optical lens 120 facing the user that meet a particular condition, the distance between the point and the center O of the at least one display 110 is less than the curvature of the surface 122 at that point. One-half of the radius, wherein the particular condition is that the tangent to the point is perpendicular to the line between the point and the center O of at least one display 110.

For example, taking the point P in FIG. 2 as an example, if the point P meets this specific condition, that is, the tangent plane of the point P is perpendicular to the line between the point P and the center O of at least one display 110, the point P and The distance d between the centers O of at least one of the displays 110 is less than one-half of the radius of curvature of the surface 122 at the point P, and all points on the surface 122 that meet this particular condition, the point and the center of the at least one display 110 The distance between them will be less than one-half of the radius of curvature of surface 122 at that point. Therefore, part of the image beam IB can pass through the trans-optical lens 120 to form an enlarged virtual image, thereby expanding the range of viewing angles that the user can view. In addition, the radius of curvature of any two points on the surface 122 of the trans-optical lens 120 may be the same or different, so as to facilitate appropriate correction and adjustment according to the deformation of the image.

In this embodiment, at least one display 110 is tilted upward at an end remote from the user's eye 50 such that at least one display 110 is tilted relative to the horizontal (as in FIG. 2). Due to the horizontal direction of the line connecting the two eyes 50, the angle of view of the human eye is approximately 50 degrees from the horizontal direction and 70 degrees downward, so if at least one display 110 is placed parallel to the horizontal direction, at least A display 110 will fall within the viewing angle of the human eye. Therefore, if at least one display 110 is tilted upward by an angle away from the end of the user's eye 50, the viewing angle range θ of the human eye can be avoided, so that the user does not directly view at least one display 110 and affects the vision. Experience.

In the present embodiment, at least one display 110 extends along the bending direction of the transflective lens 120. Specifically, the setting range of the at least one display 110 can match the extending range of the transflective lens 120, so that the user can view the image displayed by the at least one display 110 within the viewing angle of the human eye, thereby achieving a wide viewing angle. Visual experience. In this embodiment, at least one display 110 is, for example, a liquid crystal display (LCD) or an organic light emitting diode (OLED) display. In other embodiments, at least one display 110 may also include an optical projection screen, but the invention is not limited thereto.

Figure 3 is a side elevational view of a head mounted display device in accordance with another embodiment of the present invention. Referring to FIG. 3, the head mounted display device 200 of the present embodiment is similar to the display device 100 shown in FIG. 1, wherein the same reference numerals are used to refer to the same or similar elements, and the description of the same technical content is omitted. For the description of the omitted portions, reference may be made to the foregoing embodiments, and the following embodiments are not repeated. The main difference between the head mounted display device 200 of the present embodiment and the display device 100 shown in FIG. 1 is that the transflective lens 220 of the head mounted display device 200 is bent in the vertical direction (direction D2 in FIG. 3). The arc range extends below the user's eye 50, so that in addition to the horizontal direction (such as direction D1 in FIG. 3), the user can view at least one display within the viewing angle of the human eye in the vertical direction. The image displayed by 110, in turn, achieves a more comprehensive visual experience with a wide viewing angle.

In summary, in the head-mounted display device of the embodiment of the present invention, a part of the image beam is reflected to a user's eyes due to the transversal lens, and the trans-optical lens is connected to the user's eyes. The line is curved in the horizontal direction, so that part of the image beam can pass through the trans-optical lens to form an enlarged virtual image, thereby expanding the range of viewing angles that the user can view. Furthermore, the trans-transparent lens is curved horizontally toward the outside of the eyes of the user, and at least one of the displays extends along the bending direction of the transversal lens, so that the user can view within the viewing angle of the human eye. The image displayed by at least one display, thereby achieving a wide viewing angle visual experience. In addition, the trans-optical lens can also be bent in the vertical direction, so that the user can view the image displayed by at least one display in the vertical viewing angle of the human eye, thereby achieving a more comprehensive wide viewing angle visual experience.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

100, 200‧‧‧ display devices

110, 110a, 110b‧‧‧ display

120, 220‧‧‧ wearing trans lenses

122‧‧‧ surface

50‧‧‧ eyes

A-A’‧‧‧ cut line

IB‧‧ image beam

OB‧‧‧object beam

D1, D2‧‧‧ direction

P‧‧‧ points

O‧‧ Center

D‧‧‧distance

Θ‧‧‧angle of view

1 is a side view of a head mounted display device in accordance with an embodiment of the present invention. Figure 2 is a cross-sectional view taken along line A-A' of Figure 1. Figure 3 is a side elevational view of a head mounted display device in accordance with another embodiment of the present invention.

Claims (10)

A head-mounted display device comprising: at least one display for emitting an image beam; and a trans-optical lens disposed on the transmission path of the image beam, and the transflective lens reflects a portion of the image beam to a user's eye, and allowing a portion of the object beam from the outside to penetrate and transmit to the user's eye, wherein the at least one display is disposed over the transflective lens and the eye, and the transflective The lens is curved in a horizontal direction parallel to the user's two-eye line. The head-mounted display device of claim 1, wherein the transflective lens is curved in the horizontal direction toward an outer side of the eyes of the user. The head-mounted display device of claim 1, wherein the transflective lens has an arc curvature greater than 90 degrees and less than or equal to 220 degrees in the horizontal direction. The head-mounted display device of claim 1, wherein the transflective lens has an arc curvature greater than 120 degrees and less than or equal to 220 degrees in the horizontal direction. The head-mounted display device of claim 1, wherein the transflective lens is curved in a vertical direction. The head-mounted display device of claim 4, wherein the point and the center of the at least one display are all points on the surface of the transflective lens facing the user that meet a specific condition The distance between the two is less than one-half of the radius of curvature of the surface at the point, wherein the particular condition is that the tangent to the point is perpendicular to the line between the point and the center of the at least one display. The head mounted display device of claim 1, wherein the at least one display is tilted upward at an end away from the eye of the user such that the at least one display is tilted relative to the horizontal direction. The head mounted display device of claim 1, wherein the at least one display extends along a bending direction of the transflective lens. The head mounted display device of claim 1, wherein the at least one display is a liquid crystal display or an organic light emitting diode display. The head mounted display device of claim 1, wherein the at least one display comprises an optical projection screen.