CN110794582A

CN110794582A - Head-mounted display and multi-depth imaging device

Info

Publication number: CN110794582A
Application number: CN201811493595.3A
Authority: CN
Inventors: 蔡育根; 丁领亿; 陈宇恒; 杨博森
Original assignee: HTC Corp
Current assignee: HTC Corp
Priority date: 2018-08-01
Filing date: 2018-12-07
Publication date: 2020-02-14
Also published as: TW202008031A; TWI669533B

Abstract

The invention discloses a head-mounted display and a multi-depth imaging device. The imaging device includes a light-splitting element, a first display, a second display, a third display, and a lens group. The light splitting element has a first reflecting surface, a second reflecting surface, and a transmitting surface. The first display is used for projecting a first image to the first reflecting surface. The second display is used for projecting a second image to the transmission surface. The third display is used for projecting a third image to the second reflecting surface. The lens group is arranged between the light splitting element and the target area. The first image, the second image and the third image are respectively imaged on the first imaging plane, the second imaging plane and the third imaging plane, and the distances between the first imaging plane, the second imaging plane and the third imaging plane and the target area are different.

Description

Head-mounted display and multi-depth imaging device

Technical Field

The present invention relates to a head mounted display and an imaging device thereof, and more particularly, to a head mounted display having a multi-depth imaging device.

Background

In the current technical field, the stereoscopic image utilizes the convergence effect of both eyes to make the image perceived by the brain appear in space, thereby forming a sense of depth space. After the two images with binocular parallax generated in the virtual environment are reflected on the retinas of the eyes of the user, the sight line can be focused on any virtual object in the virtual environment as in the real world. However, in the display image, each virtual object having a distinct sense of depth and different front and rear positions is not displayed at the corresponding visual depth, but each object is displayed at the same visual depth as in the flat display image. This phenomenon violates the normal visual physiology, changes the normal visual physiology, and can lead to the disharmony and even conflict of the regulation and convergence relationship.

The light based on the display image emitted by the head-mounted display has no depth information, so that the visual fatigue symptoms such as blurred vision, dry eyes, dizziness, photophobia, nausea, vomiting and the like are easy to generate under long-time use.

Disclosure of Invention

The invention aims to provide a head-mounted display and an imaging device thereof, which can reduce the influence caused by vergence-accommodation conflict.

An imaging device of the present invention includes a light-splitting element, a first display, a second display, a third display, and a lens group. The light splitting element has a first reflecting surface, a second reflecting surface, and a transmitting surface. The first display is used for projecting a first image to the first reflecting surface. The second display is used for projecting a second image to the transmission surface. The third display is used for projecting a third image to the second reflecting surface. The first reflection surface reflects the first image to the target area, the second reflection surface reflects the third image to the target area, and the second image passes through the transmission surface to be projected to the target area. The lens group is arranged between the light splitting element and the target area. The first image, the second image and the third image are respectively imaged on the first imaging plane, the second imaging plane and the third imaging plane, and the distances between the first imaging plane, the second imaging plane and the third imaging plane and the target area are different.

The head mounted display of the present invention comprises a housing and one or more imaging devices as described above. The image forming apparatus is disposed in the main body.

Based on the above, the present invention images a plurality of images on the imaging surfaces at different positions through the light splitting element, and reduces the dazzling of the user caused by the conflict of the vergence-accommodation by generating the images at different depths.

In order to make the aforementioned and other features and advantages of the invention more comprehensible, embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic view of an imaging apparatus according to an embodiment of the invention;

FIG. 2 is a schematic diagram of a position of an imaging plane according to an embodiment of the present invention;

fig. 3 is a schematic view of configuration details of an imaging apparatus of an embodiment of the present invention;

FIGS. 4A-4C are schematic views of an imaging device and a generated image transmission path according to another embodiment of the invention;

FIG. 5 is a diagram illustrating the relationship between the reflectivity of the coating and the wavelength of the image;

fig. 6 is a schematic diagram of a head-mounted display according to an embodiment of the invention.

Description of the symbols

100. 400: image forming apparatus with a plurality of image forming units

110. 410: light splitting element

121. 122, 123, 421, 422, 423: display device

130. 430: lens group

RF 1: first reflecting surface

RF 2: second reflecting surface

TF 1: transmitting surface

TG: target area

D1-D3: distance between two adjacent plates

ISF 1-ISF 3: image plane

EXT 1-EXT 3: extension line

IS 1-IS 3: inner surface

CV: groove

IMG1, IMG11, IMG12, IMG2, IMG21, IMG221, IMG222, IMG3, IMG31, IMG 32: image forming method

510. 520, the method comprises the following steps: curve line

600: head-mounted display

610: image forming apparatus with a plurality of image forming units

620: shell body

Detailed Description

Referring to fig. 1, fig. 1 is a schematic view illustrating an imaging device according to an embodiment of the invention. The imaging device 100 includes a light splitting element 110, displays 121, 122, and 123, and a lens group 130. The spectroscopic element 110 has a first reflection surface RF1, a second reflection surface RF2, and a transmission surface TF 1. The display 121 is configured to project the first image onto the first reflective surface RF1, the first reflective surface RF1 and reflect the first image, so that the first image is projected onto the target area TG. The display 122 is configured to project a second image toward the transmission surface TF1, and the second image passes through the transmission surface TF1 of the light splitting element 110 to be projected to the target area TG. The display 123 projects a third image onto the second reflective surface RF2 of the light splitting element 110, and the second reflective surface RF2 reflects the third image, so that the third image is projected onto the target area TG.

The lens assembly 130 is disposed between the light splitting element 110 and the target area TG, and is used for focusing the first image, the second image and the third image, and imaging the first image, the second image and the third image on the first imaging plane, the second imaging plane and the third imaging plane which are different. The emphasis is that the distances between the first imaging plane, the second imaging plane and the third imaging plane and the target area TG are different.

Referring to fig. 1 and fig. 2 synchronously, fig. 2 is a schematic diagram illustrating a position of an image plane according to an embodiment of the invention. In fig. 2, the target area TG is a region where the user's eyes are located, and the first image, the second image and the third image are imaged on the first imaging plane ISF1, the second imaging plane ISF2 and the third imaging plane ISF3, respectively, by the imaging device 100. In the present embodiment, the distance between the first imaging plane ISF1 and the target region TG is smaller than the distance between the second imaging plane ISF2 and the target region TG, and the distance between the second imaging plane ISF2 and the target region TG is smaller than the distance between the third imaging plane ISF3 and the target region TG.

Referring to fig. 1 again, in the embodiment of the invention, in order to make the positions of the imaging planes (the first imaging plane ISF1, the second imaging plane ISF2, and the third imaging plane ISF3) of the first image, the second image, and the third image different, a vertical distance D1 is provided between the display 121 generating the first image and the intersection of the first reflecting plane RF1 and the second reflecting plane RF2, a vertical distance D2 is provided between the display 122 generating the second image and the center point of the transmitting plane TF1, a vertical distance D3 is provided between the display 122 generating the third image and the intersection of the first reflecting plane RF1 and the second reflecting plane RF2, and the vertical distances D1, D2, and D3 are not equal (for example, the vertical distance D1< vertical distance D2< vertical distance D3). Thus, the first, second, and third images can be imaged on the first, second, and third imaging planes ISF1, ISF2, and ISF3, respectively, having different depths.

As can be readily understood from the above description, the embodiment of the present invention can divide the image into the first image, the second image and the third image according to the depth, and image the first image, the second image and the third image on the first imaging plane ISF1, the second imaging plane ISF2 and the third imaging plane ISF3 at different depths by the imaging device 100. Therefore, the user can observe the image, wherein a plurality of objects can have a plurality of different depth-of-field effects similar to the actual image, so that the dizzy state of the user caused by the conflict of the vergence-accommodation can be effectively reduced, and the comfort level of the user is improved.

Regarding the configuration of the imaging device according to the embodiment of the present invention, please refer to fig. 3 for a schematic diagram of the configuration details of the imaging device according to the embodiment of the present invention. In fig. 3, the light splitting element 110 may be a rectangular light splitting element, the first reflection surface RF1 and the second reflection surface RF2 may be respectively disposed on two diagonal lines of the rectangular light splitting element 110, and the transmission surface TF1 is formed on the back surface of the first reflection surface RF1 and the second reflection surface RF 2. The displays 121-123 may be respectively disposed adjacent to three different sides of the light splitting element 110, the display 121 may be opposite to the display 123, the extension line EXT1 of the display 121 may intersect with the extension line EXT2 of the display 122, and the extension line EXT3 of the display 123 may intersect with the extension line EXT2 of the display 122. In the embodiment, the display 121 may be disposed in parallel with the display 123, the extension lines EXT1 and EXT2 may be orthogonal to each other, and the extension lines EXT3 and EXT2 may be orthogonal to each other, but is not limited thereto.

Referring to fig. 4A to 4C, fig. 4A to 4C are schematic diagrams illustrating an imaging device and a generated image transmission path according to another embodiment of the invention. The imaging device 400 includes a light-splitting element 410, displays 421 to 423, a frame 440 and a lens set 430. The frame 440 has inner surfaces IS 1-IS 3, the inner surfaces IS1 IS opposite to IS3, the inner surfaces IS1 IS in contact with IS2, the inner surfaces IS2 IS in contact with IS3, and can form a semi-enclosed structure. The displays 421 to 423 are respectively provided on the inner surfaces IS1 to IS 3. The inner surfaces IS 1-IS 3 form a groove CV in which the light-splitting element 410 may be disposed.

In another aspect, in embodiments of the present invention, the first reflective surface RF1 may have a first plating thereon. When the first image IMG1 generated by the display 421 is transmitted to the first reflective surface RF1, the first coating reflects a first proportion of the first image IMG11 to the target area TG and transmits a second proportion of the first image IMG12, wherein the first proportion is not less than the second proportion. That is, the first ratio of the first image IMG11 may be transferred to the target area TG by the first plating film on the first reflection surface RF1, and the brightness of the first ratio of the first image IMG11 may be greater than or equal to the second ratio of the first image IMG 12.

In fig. 4B, the second reflective surface RF2 may have a second plating thereon. When the third image IMG3 generated by the display 423 is transmitted to the second reflective surface RF2, the second coating reflects a third ratio of the third image IMG31 to the target area TG and transmits a fourth ratio of the third image IMG32, wherein the third ratio is not less than the fourth ratio. That is, the third ratio of the third image IMG31 may be transmitted to the target area TG by the second plating film on the second reflection surface RF2, and the brightness of the third ratio of the third image IMG31 may be greater than or equal to the fourth ratio of the third image IMG 32.

In fig. 4C, the transmission face TF1 can receive the second image IMG2 generated by the display 422, and the transmission face TF1 can have a third coating thereon. The third plating film may be configured to transmit a fifth ratio of the second image IMG21 to the target area TG and reflect a sixth ratio of the second image IMGs 221 and 222, wherein the fifth ratio is not less than the sixth ratio. That is, the third plating film may transfer the fifth ratio of the second image IMG21 to the target area TG, and the brightness of the fifth ratio of the second image IMG21 may be greater than or equal to the sixth ratio of the second image IMGs 221 and 222.

The materials of the first, second, and third plating films may be selected according to the wavelengths of the first and second images to be reflected. Please refer to fig. 5, which illustrates a relationship between a reflectivity of a coating and a wavelength of an image. In fig. 5, a curve 510 is a relationship between the image wavelength and the reflectance of the reflection surface without the coating, and a curve 520 is a relationship between the image wavelength and the reflectance of the reflection surface after the coating. By selecting the material of the first plating film having a high reflectance corresponding to the wavelength of the first image, the brightness of the first image of the first ratio at which the first image is reflected to the target area can be increased, and similarly, by selecting the material of the second plating film having a high reflectance corresponding to the wavelength of the third image, the brightness of the third image of the third ratio at which the third image is reflected to the target area can be increased. In addition, the material of the third coating film with high transmittance is selected according to the wavelength of the second image, so that the brightness of the fifth proportion of the second image, which is transmitted to the target area by the second image, is improved. By selecting suitable materials for the first coating film, the second coating film and the third coating film, the light intensity of the display image entering eyes can be greatly increased, and the energy efficiency can be increased.

Referring to fig. 6, fig. 6 is a schematic view illustrating a head-mounted display according to an embodiment of the invention. The head mounted display 600 includes one or more imaging devices 610 and a housing 620. The image imaging device 610 corresponds to the target area TG to be disposed in the housing 620.

The imaging device 610 in this embodiment can be implemented by the

imaging device

100 or 400 of the foregoing embodiment. Details of the operation of the

imaging device

100 or 400 have been described in the foregoing embodiments and implementations, and are not repeated herein.

In summary, the present invention provides a light splitting element for performing reflection and transmission of images for displays with different depth distances, and enabling a plurality of images to be respectively imaged on imaging surfaces with different depths. Therefore, the imaging device can generate display images of a plurality of objects with different depths like an actual image, and can effectively reduce the dazzling state of a user caused by the convergence-convergence conflict.

Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the invention.

Claims

1. An image forming apparatus, comprising:

a light splitting element having a first reflective surface, a second reflective surface, and a transmissive surface;

the first display is used for projecting a first image to the first reflecting surface;

a second display for projecting a second image onto the transmission surface;

a third display for projecting a third image onto the second reflective surface,

the first reflection surface reflects the first image to the target area, the second reflection surface reflects the third image to the target area, and the second image passes through the transmission surface to be projected to the target area; and

a lens set disposed between the beam splitter and the target region,

the first image, the second image and the third image are respectively imaged on a first imaging plane, a second imaging plane and a third imaging plane, and the distances between the first imaging plane, the second imaging plane and the third imaging plane and the target area are different.

2. The imaging device of claim 1, wherein the first display has a first perpendicular distance from an intersection of the first reflective surface and the second reflective surface, the second display has a second perpendicular distance from a center point of the transmissive surface, the third display has a third perpendicular distance from the intersection of the first reflective surface and the second reflective surface, the first perpendicular distance, the second perpendicular distance, and the third perpendicular distance being different.

3. The imaging apparatus of claim 1, further comprising:

a frame having a first inner surface, a second inner surface and a third inner surface, the first inner surface, the second inner surface and the third inner surface being respectively configured to configure the first display, the second display and the third display,

the first inner surface is opposite to the third inner surface, the first inner surface is contacted with the second inner surface, and the third inner surface is contacted with the second inner surface.

4. The imaging device of claim 3, wherein the first inner surface, the second inner surface, and the third inner surface form a groove, the light splitting element being disposed in the groove.

5. The imaging device of claim 3, wherein the first reflective surface has a first coating for reflecting a first proportion of the first image to the target area and transmitting a second proportion of the first image, wherein the first proportion is not less than the second proportion.

6. The imaging device of claim 5, wherein the second reflective surface has a second coating configured to reflect a third proportion of the third image to the target area and transmit a fourth proportion of the third image, wherein the third proportion is not less than the fourth proportion.

7. The imaging device of claim 6, wherein the transmissive surface has a third coating for transmitting a fifth proportion of the second image to the target area and reflecting a sixth proportion of the second image, wherein the fifth proportion is not less than the sixth proportion.

8. A head-mounted display, comprising:

a housing; and

at least one imaging device according to claim 1, disposed in the housing.