Head-mounted display devices

Abstract

The present invention provides a head-mounted display device for virtual reality, comprising a first display, a first lens, a second lens, a spectroscopic coating, and a second display. The active surface of the first display generates a first display image beam. The first lens has a first surface facing the active surface of the first display, and a second surface opposite to the first surface. The second lens has a third surface and a fourth surface opposite to each other. The spectroscopic coating is arranged between the second surface of the first lens and the third surface of the second lens. The third surface of the second lens and the second surface of the first lens are bonded to each other through the spectroscopic coating. The second display has a fourth surface with an active surface facing the second lens. The active surface of the second display generates a second display image beam.

Description

Technical Field

[0001] The present invention relates to a virtual reality head-mounted display device, and in particular to a virtual reality head-mounted display device capable of expanding the visual field. Background Art

[0002] A large field of view (FOV) and a compact size are crucial attributes for today's virtual reality head-mounted displays. Furthermore, there's been extensive discussion on the design of multi-depth displays. For example, using multiple image planes to address vergence-accommodation conflict can effectively alleviate the visual discomfort of wearing a head-mounted display. However, multi-depth display architectures often require numerous components and increased size within the head-mounted display, making it difficult to balance the need for visual anti-dizziness with the pursuit of lightweight and comfortable wearability. Summary of the Invention

[0003] The present invention is directed to a virtual reality head-mounted display device that can simultaneously meet the requirements of a wide viewing angle, a small size, and support for simultaneous multi-depth display while taking into account lightweight.

[0004] According to an embodiment of the present invention, a head-mounted display device for virtual reality includes a first display, a first lens, a second lens, a spectroscopic coating, and a second display. The first display has an active surface. The first display is a transmissive display, and its active surface generates a first display image beam. The first lens has a first surface facing the active surface of the first display, and a second surface opposite to the first surface. The second lens has a third surface and a fourth surface opposite to each other. The spectroscopic coating is arranged between the second surface of the first lens and the third surface of the second lens. The third surface of the second lens and the second surface of the first lens are bonded to each other through the spectroscopic coating, the first lens is a convex lens, and the second lens is a concave lens or a convex lens. The second display has the fourth surface with the active surface facing the second lens. The active surface of the second display generates a second display image beam.

[0005] In a virtual reality head-mounted display device according to an embodiment of the present invention, a first lens, a spectroscopic coating, and a second lens are provided in a mutually bonded manner to reflect a first image beam produced by a first display and simultaneously transmit a second image beam produced by a second display. This effectively provides a multi-layer display effect and expands the field of view of the head-mounted display device without increasing the size of the head-mounted display device. This effectively improves display quality while maintaining a lightweight and thin design. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the present invention and together with the description serve to explain the principles of the present invention.

[0007] Figure 1 is a schematic diagram of a head-mounted display device according to an embodiment of the present invention;

[0008] Figure 2 Schematic diagram of the light path generated by the first lens, the second lens, and the spectroscopic coating in the head-mounted display device according to an embodiment of the present invention;

[0009] Figures 3A to 3C is a schematic diagram of the transmission action of an image light beam according to an embodiment of the present invention;

[0010] Figures 3D to 3F is a schematic diagram of the transmission action of an image beam according to another embodiment of the present invention;

[0011] Figure 4A as well as Figure 4B They are schematic diagrams of different implementations of a head-mounted display device according to another embodiment of the present invention.

[0012] Explanation of Figure Numbers

[0013] 100, 401, 402: head-mounted display devices;

[0014] 110, 310, 410: first display;

[0015] 120, 210, 320, 320': first lens;

[0016] 130, 220, 330, 330': second lens;

[0017] 150, 350, 450: Second display;

[0018] 460, 470: third lens;

[0019] 140, 230, 340, 340': spectroscopic coating;

[0020] 470: actuator;

[0021] AF1, AF2: active surfaces;

[0022] CS: electrical signal;

[0023] HD1, HD2: horizontal direction;

[0024] NAF: non-active surface;

[0025] SF1~SF4, SF1', SF2', SF3': surface;

[0026] TG: target zone;

[0027] LB11, LB12, LB21~LB23: beam;

[0028] RLB11, RLB12: reflected beam;

[0029] IMB1, IMB2: display image beam;

[0030] RIMB1: reflects the display image beam;

[0031] FIMB2: Focused image beam. DETAILED DESCRIPTION

[0032] Reference will now be made in detail to exemplary embodiments of the present invention, examples of which are illustrated in the accompanying drawings. Whenever possible, the same reference numerals are used in the drawings and the description to refer to the same or like parts.

[0033] Please refer to Figure 1 , Figure 1 FIG1 is a schematic diagram of a head-mounted display device according to an embodiment of the present invention. The head-mounted display device 100 includes a first display 110, a first lens 120, a second lens 130, a spectroscopic coating 140, and a second display 150. The first display 110 may be a transmissive display. The first display 110 has an active surface AF1. The first display 110 is configured to generate a first display image beam on the active surface AF1. The first lens 120 has a first surface SF1 and a second surface SF2. The first surface SF1 of the first lens 120 faces the active surface of the first display 110. The second surface SF2 of the first lens 120 is opposite to the first surface SF1 of the first lens 120. The second lens 130 has a third surface SF3 and a fourth surface SF4 that are opposite to each other. The spectroscopic coating 140 is disposed between the second surface SF2 of the first lens 120 and the third surface SF3 of the second lens 130. In this embodiment, the third surface SF3 of the second lens 130 is bonded to the second surface SF2 of the first lens 120 by the spectroscopic coating 140.

[0034] In this embodiment, the first lens 120 is a convex lens, and the second lens 130 is a concave lens. The first display image beam generated on the active surface AF1 of the first display 110 can be projected onto the first surface SF1 of the first lens 120. The first display image beam can then be transmitted to the spectroscopic coating 140 on the second surface SF2 of the first lens 120. The spectroscopic coating 140 can reflect the received first display image beam to generate a reflected display image beam, which then transmits through the first display 110 and is projected onto a target area TG. The target area TG is located at the exit pupil of the head-mounted display device 100, corresponding to the position of the user's eyeballs. The user's eyeballs are directed toward the inactive surface NAF1 of the first display 110.

[0035] Furthermore, the second display 150 has an active surface AF2, wherein the active surface AF2 of the second display 150 faces the fourth surface SF4 of the second lens 130. The active surface AF2 of the second display 150 can be used to generate a second display image beam and project the generated second image beam onto the fourth surface SF4 of the second lens 130. In this embodiment, the focusing effect of the second lens 130 and the first lens 120 can generate a focused image beam based on the second display image beam. The focused image beam can be transmitted through the first display 110 and delivered to the target area TG.

[0036] Please note that in this embodiment, the first surface SF1 of the first lens 120 may have a first curvature CR1, and the second surface SF2 of the first lens 120 may have a second curvature CR2, wherein the absolute value of the first curvature CR1 is smaller than the absolute value of the second curvature CR2. The third surface SF3 of the second lens 130 may have a third curvature CR3, and the fourth surface SF4 of the second lens 130 may have a fourth curvature CR4. Furthermore, the first curvature CR1 and the fourth curvature CR4 may be the same, and the sum of the second curvature CR2 and the third curvature CR3 may be equal to zero.

[0037] Specifically, the second surface SF2 of the first lens 120 may be a convex surface, and the third surface SF3 of the second lens 130 may be a concave surface. In addition, the first surface SF1 of the first lens 120 and the fourth surface SF4 of the second lens 130 may be flat surfaces having the same curvature, or curved surfaces having the same curvature.

[0038] Incidentally, in this embodiment, the first display 110 , the first lens 120 , the spectroscopic coating 140 , and the second lens 130 may be disposed in a tube of the head-mounted display device 100 .

[0039] Please refer to the following Figure 2 , Figure 2 This is a schematic diagram of the light path generated by the first lens, the second lens, and the spectroscopic coating in the head-mounted display device according to an embodiment of the present invention. Figure 2 In the embodiment, the first lens 210 has a first surface SF1 and a second surface SF2 that are opposite to each other. The second lens 220 has a third surface SF3 and a fourth surface SF4 that are opposite to each other. A spectroscopic coating 230 is bonded between the second surface SF2 of the first lens 210 and the third surface SF3 of the second lens 220. Furthermore, the second surface SF2 of the first lens 210 is convex, while the third surface SF3 of the second lens 220 can be concave.

[0040] exist Figure 2 In the embodiment, light beam LB11 is projected onto the first surface SF1 of the first lens 210. The first lens 210 deflects light beam LB11 to generate light beam LB12. Light beam LB12 travels through the first lens 210 and is transmitted to the dichroic coating 230 on the second surface SF2 of the first lens 210. The dichroic coating 230 reflects light beam LB12 to generate reflected light beam RLB11. The reflected light beam RLB11 travels from the second surface SF2 of the first lens 210 toward the first surface SF1 of the first lens 210 and is deflected on the first surface SF1 of the first lens 210 to generate reflected light beam RLB12. The reflected light beam RLB12 can then be projected onto the target area.

[0041] On the other hand, another light beam LB21 can be transmitted from the outside of the fourth surface SF4 of the second lens 220 to the fourth surface SF4 of the second lens 220. The second lens 220 can deflect the light beam LB21 to generate a light beam LB22. The light beam LB22 travels through the second lens 220 and is transmitted to the dichroic coating 230 on the third surface SF3 of the second lens 220. The dichroic coating 230 allows the light beam LB22 to pass through and transmit it to the first lens 210. When the light beam LB22 is transmitted to the first surface SF1 of the first lens 210, it can be further deflected to generate a light beam LB23, which then exits the first lens 210. The light beam LB23 can then be transmitted to the target area.

[0042] In this embodiment, the light beam LB11 can be Figure 1 The first display image light beam generated by the first display 110 in the embodiment. The light beam LB21 can be Figure 1 The second display image light beam generated by the second display 150 in the embodiment. The light beam RLB12 can be Figure 1 The reflected display image light beam mentioned in the embodiment, the light beam LB23 can be Figure 1The focused image beam mentioned in the embodiment.

[0043] Please refer to the following Figures 3A to 3C , Figures 3A to 3C FIG. 1 is a schematic diagram of the transmission action of the image beam according to an embodiment of the present invention. Figure 3A In the embodiment, the first display 310 generates a first display image beam IMB1 through an active surface. The first display image beam IMB1 is projected onto the first lens 320 and transmitted to the beam splitting coating 340 on the second surface SF2 via the first surface SF1 of the first lens 320.

[0044] The dichroic coating 340 is used for reflecting the first display image beam IMB1 to generate a reflected display image beam RIMB1 . The reflected display image beam RIMB1 passes through the first surface SF1 of the first lens 320 and is transmitted to the target area TG behind the transmissive display 310 .

[0045] In this embodiment, the first display image beam IMB1 may include an image beam of a first-level virtual reality image. The reflected display image beam RIMB1 transmitted to the target zone TG allows the user to smoothly observe the first-level image of the virtual reality image.

[0046] exist Figure 3B In the embodiment, the second display image beam IMB2 is generated by the second display 350 and transmitted from the outer side of the fourth surface SF4 of the second lens 330 to the fourth surface SF4 of the second lens 330. The second display image beam IMB2 sequentially passes through the fourth surface SF4 of the second lens 330, the spectroscopic coating 340, and the first surface SF1 of the first lens 320. The focusing effect of the second lens 330 and the first lens 320 produces a focused image beam FIMB2. The focused image beam FIMB2 can be projected onto the target area TG. In this way, a wide range of the second display image beam IMB2 can be focused and projected onto the target area TG, allowing the user to observe the second layer image of the virtual reality image.

[0047] Figure 3C Then Figure 3A as well as Figure 3B Through the arrangement of the first lens 320, the spectroscopic coating 340, and the second lens 330, the first display image beam generated by the first display 310 and the second display image beam generated by the second display 350 can be projected simultaneously or in a time-sharing manner onto the target area TG via the reflected image beam and the focused image beam, respectively. This allows the user to observe multi-layered virtual reality display images.

[0048] Please refer to the following Figures 3D to 3F , Figures 3D to 3FFIG. 1 is a schematic diagram of the transmission action of an image beam according to another embodiment of the present invention. Figures 3A to 3C Differently, this embodiment uses a first lens 320' which is a convex lens, a spectroscopic coating 340' and a second lens 330' which is a convex lens to reflect and refract the image light beams generated by the first display 310 and the second display 350, so that the corresponding reflected image light beams and refracted image light beams can be transmitted to the target area TG.

[0049] exist Figure 3E In the embodiment, the first display 310 projects a first display image beam IMB1 onto the first lens 320'. The beam is transmitted to the dichroic coating 340' on the second surface SF2' via the first surface SF1' of the first lens 320'. The dichroic coating 340' is configured to reflect the first display image beam IMB1 to generate a reflected display image beam RIMB1. The reflected display image beam RIMB1 passes through the first surface SF1' of the first lens 320' and is transmitted to the target area TG behind the transmissive display 310.

[0050] exist Figure 3F In the embodiment, the second display image beam IMB2 is generated by the second display 350 and transmitted from the outer side of the fourth surface SF4' of the second lens 330' to the fourth surface SF4' of the second lens 330'. The second display image beam IMB2 sequentially passes through the fourth surface SF4' of the second lens 330', the spectroscopic coating 340', and the first surface SF1' of the first lens 320'. The focusing effect of the second lens 330' and the first lens 320' produces a focused image beam FIMB2. The focused image beam FIMB2 is projected onto the target area TG.

[0051] Please refer to Figure 4A as well as Figure 4B , Figure 4A as well as Figure 4B Schematic diagrams of different implementations of a head mounted display device according to another embodiment of the present invention. Figure 4AIn the embodiment, the head-mounted display device 401 includes a first display 410, a first lens 420, a second lens 430, a spectroscopic coating 440, a second display 450, a third lens 460, and an actuator 470. The first display 410 has an active surface AF1. The first display 410 is configured to generate a first display image beam on the active surface AF1. The first lens 420 has a first surface SF1 and a second surface SF2. The first surface SF1 of the first lens 420 faces the active surface of the first display 410. The second surface SF2 of the first lens 420 is opposite to the first surface SF1 of the first lens 420. The second lens 430 has a third surface SF3 and a fourth surface SF4 opposite to each other. The spectroscopic coating 440 is disposed between the second surface SF2 of the first lens 420 and the third surface SF3 of the second lens 430. In this embodiment, the third surface SF3 of the second lens 430 is bonded to the second surface SF2 of the first lens 420 via the spectroscopic coating 440.

[0052] In this embodiment, the first lens 420 is a convex lens, and the second lens 430 is a concave lens. The first display image beam generated on the active surface AF1 of the first display 410 can be projected onto the first surface SF1 of the first lens 420. The first display image beam can then be transmitted to the spectroscopic coating 440 on the second surface SF2 of the first lens 420. The spectroscopic coating 440 can reflect the received first display image beam to generate a reflected display image beam, which then transmits through the first display 410 and is projected onto a target area TG. The target area TG is located at the exit pupil of the head-mounted display device 401, corresponding to the position of the user's eyeballs. The user's eyeballs of the head-mounted display device 401 are directed toward the non-active surface NAF1 of the first display 410.

[0053] It is worth noting that, unlike the aforementioned embodiment, the head-mounted display device 401 is provided with a third lens 460 and an actuator 470 coupled to the third lens 460 between the second lens 430 and the second display 450. The actuator 470 can be used to control the horizontal movement of the third lens 460, for example, moving along the direction HD1 to approach the second lens 430 (away from the second display 450), or moving along the direction HD2 to move away from the second lens 430 (closer to the second display 450).

[0054] The third lens 460 may be a convex lens. The third lens 460 can be used to adjust the focus of the second display image beam generated by the second display 450. This expands the field of view provided by the second display image beam within the limited distance between the second lens 430 and the second display 450.

[0055] In this embodiment, the actuator 470 may be any form of motor or mechanical structure, and may adjust the position of the third lens 460 according to an electrical signal or manual adjustment by the user.

[0056] exist Figure 4B In, with Figure 4A In a different embodiment, a third lens 470 is disposed between the second lens 430 and the second display 450 in the head-mounted display device 402. The third lens 470 may be a liquid crystal lens. In this embodiment, the third lens 470 adjusts its curvature based on an electrical signal CS to achieve focal length adjustment.

[0057] In summary, the present invention achieves a widened field of view by disposing a lens assembly within the tubular body of a head-mounted display device and utilizing a spectroscopic coating within the lens assembly to reflect a first image beam generated by a first display and transmit a second image beam generated by a second display. As a result, the head-mounted display device of the present invention achieves a widened field of view while maintaining a lightweight, thin, and compact design, effectively enhancing the product competitiveness of head-mounted display devices.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A virtual reality head-mounted display device, characterized in that include: A first display having an active surface, wherein the first display is a transmissive display, and the active surface of the first display generates a first display image beam; a first lens having a first surface facing an active surface of the first display and a second surface opposite to the first surface; a second lens having a third surface and a fourth surface opposite to each other; A spectroscopic coating is provided between the second surface of the first lens and the third surface of the second lens. The third surface of the second lens and the second surface of the first lens are bonded to each other through the beam splitting coating, the first lens is a convex lens, and the second lens is a convex lens or a concave lens; A second display having an active surface facing the fourth surface of the second lens, the active surface of the second display generating a second display image beam; as well as The third lens is disposed between the second lens and the second display and is used to adjust the focus state of the second display image beam. The third lens is coupled to an actuator, and the actuator is used to move the third lens horizontally between the second lens and the second display.

2. The head-mounted display device according to claim 1, wherein The inactive surface of the first display is opposite to the active surface of the first display, and the inactive surface of the first display faces the user.

3. The head-mounted display device according to claim 1, wherein The first surface of the first lens has a first curvature, the second surface of the first lens has a second curvature, an absolute value of the first curvature is smaller than an absolute value of the second curvature; and the third surface of the second lens has a third curvature.

4. The head-mounted display device according to claim 3, wherein The sum of the second curvature and the third curvature is equal to 0.

5. The head-mounted display device according to claim 1, wherein The beam splitting coating reflects the first display image light beam and transmits the reflected display image light beam to a target area.

6. The head-mounted display device according to claim 5, characterized in that The fourth surface of the second lens receives the second display image beam, the beam splitting coating transmits the second display image beam, and the second lens and the first lens focus the second display image beam and transmit a focused image beam to the target area.

7. The head-mounted display device according to claim 1, wherein The second surface of the first lens, the beam splitting coating, and the third surface of the second lens are glued to each other. 8 . The head-mounted display device according to claim 5 , wherein the target area is an exit pupil position of the head-mounted display device.

9. The head-mounted display device according to claim 1, wherein The third lens is a liquid crystal lens, and the curvature of the third lens is adjusted according to an electrical signal.

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