KR101598480B1 - See-through type head mounted display - Google Patents

Abstract

A see-through head-mounted display device according to the present invention comprises: a mounting part for being mounted on a head of a user; a housing installed on the mounting part and placed on a face of the user; a display installed inside the housing and placed perpendicularly to the staring direction of the user; and an optical system placed in the staring direction of the user inside the housing. The optical system includes: one or more aspherical lenses installed at a position adjacent to the display; a beam splitter prism placed in the staring direction of the user; a polarizing film or coating installed between the beam splitter prisms; a reflecting mirror installed on the lower end of the prism; and a polarizing plate film or coating installed between the reflecting mirror and the prism. The see-through head-mounted display device, according to an embodiment of the present invention, can provide a stable and clear image to a user by minimizing a distortion of the image when the image of a micro-display providing a high resolution is projected through the optical system. Also, virtual information and an external image are merged and composite image information is provided to the user as outside view of the user can be secured through the prism.

Description

[0001] The present invention relates to a see-through type head mounted display,

The present invention relates to a head-mounted display device, and more particularly, to a head-mounted display device which displays a see-through type head mount display which combines information provided as a virtual screen on a user's head and an external image, ≪ / RTI >

2. Description of the Related Art A head mounted display (HMD) generally includes a head mount portion to be worn on a user's head and a proximity display coupled to the head mount portion to provide an image close to a user's eyes. The proximity display is typically implemented with one or two microscopic elements and magnifying lenses and associated optical systems.

Such head-mounted display devices are mainly used for imaging of military, medical and educational video systems and entertainment virtual reality systems, and recently, they have also been used for home or portable video devices. The head-mounted display may be divided into an immersive type or a see-through type.

The head-mounted display uses an enlarged lens to magnify the image so that the user can view the largest possible screen, since the image of the proximity display is displayed in a very small area. However, when such an enlargement lens and an optical system are used, optical distortion occurs inevitably. This optical distortion causes severe fatigue to the eyes when the head-mounted display device is worn for a long time, thereby causing difficulty in wearing for a long time.

Furthermore, the see-through type head-mounted display device has a problem that the optical distortion phenomenon appears more prominently because the external image and the virtual screen that are viewed through the prism are fused and provided. Such an optical distortion phenomenon can be minimized according to the design of the optical system, but it is difficult to completely solve it. On the other hand, some distortion can be solved by using an image processing method. However, in this case, a high-cost hardware configuration is required, and therefore, there is a limit in applying to a head-mounted display device.

U.S. Published Patent Application No. 2011-0234584 (disclosed on September 29, 2011)

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a view-through type head-mounted display device that minimizes optical distortion caused by a lens configuration of an optical system and improves wear and use efficiency.

A view-through type head-mounted display device according to the present invention includes: a wearable portion to be worn on a user's head; A housing installed in the wearer and positioned corresponding to a face of a user; A display installed inside the housing and positioned perpendicular to the direction of the user's gaze; And an optical system positioned inside the housing in a user's direction of sight, wherein the optical system includes a beam splitter prism provided at a position adjacent to the display, and an aspheric lens installed between the display and the beam splitter prism Wherein the beam splitter prism includes a pair of prisms corresponding to the inclined surfaces, a polarizing reflection film provided between the pair of prisms, a curved surface provided at the lower ends of the pair of prisms, And a polarizing plate provided between the polarizing plates.

The aspherical lens may include an upper lens having a parabolic surface having a predetermined width on an upper surface facing the display and a lower lens positioned on a bottom surface of the upper lens and having a double curved surface on an upper surface contacting the lower surface of the upper lens. .

The upper and lower widths of the display may be equal to or less than the width of the parabolic surface of the upper lens.

The aspherical lens and the curved surface may be cut at the top and bottom to reduce the black area of the display to provide a wide view.

And the aspheric lens is positioned in the same direction as the display surface of the display and in a direction perpendicular to a line of sight of the user.

A motion sensor may be installed in the housing. The motion sensor may include a gyro sensor, a mechanical sensor, and an acceleration sensor. The motion sensor may sense the movement of the user's head.

A camera may be installed inside the housing, and an image recorded by the camera can be streamed in real time. To this end, the direction measured by the camera is the same as the viewing direction of the user, and is installed at a position close to the user's eyes, thereby recording the same image as the image coming into the user's field of view.

The motion sensor, the camera, and the display are capable of supplying power and communicating information through an integrated electronic circuit, and the board for controlling the electronic circuit can be configured as a separate controller board.

The display and the optical system may include a first display and a first optical system corresponding to the user's left eye, and a second display and a second optical system corresponding to the right eye.

A processor for providing an image to the first display and the second display, and an external source for providing an image signal to the processor.

The processor may divide the video signal received from the external source into the first display and the second display.

The wearer is fixed on the face of the user in the form of a spectacle, and a band is coupled to both ends of the eyeglasses to enclose the user's head. The band is provided with a velcro, The inner diameter can be adjusted so as to match the inner diameter.

The wearing part may further include a nose supporting part having various sizes that can be replaced, and a type most suitable for the nose height, width and shape of the user may be selected and used.

A window positioned in the viewing direction of the user and having an absorption type polarizing film or an absorption type polarizing coating may be provided on the front surface of the mechanism section. The absorptive polarizing film or the absorptive polarizing coated window has the effect of reducing the amount of light reaching the user's eyes from the outside, thereby enhancing the contrast of the virtual screen provided by the display.

In addition, the amount of light reaching the user's eye can be adjusted according to the arrangement angle of the polarizing reflection film provided between the absorption type polarizing film and the prism.

As described above, the present invention has an advantage of providing a stable and clear image to a user by minimizing image distortion when projecting an image of a microdisplay that provides high resolution through an aspherical optical system.

In addition, the present invention makes it possible to provide composite image information to a user by fusing an external image viewed through an optical system.

Further, the present invention has an effect that a part of the lens is used as a plastic lens and unnecessary upper and lower ends of the lens are cut to minimize the weight.

1A and 1B are perspective views of a see-through head-mounted display device according to the present invention,
Fig. 2 is an exploded perspective view of a see-through head-mounted display device according to the present invention,
3 is a view showing an optical system provided in a see-through head-mounted display device according to the present invention,
4 is a block diagram of a see-through type head-mounted display device according to the present invention,
5 is a graph showing a distortion rate of an optical system provided in a see-through type head-mounted display device according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a see-through head-mounted display device according to the present invention will be described in detail with reference to the drawings. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS The same features of the Figures represent the same reference symbols wherever possible. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The terms first, second, etc. may be used to describe various components, but the components are not limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the relevant art and are to be interpreted in an ideal or overly formal sense unless explicitly defined in the present application Do not.

Each block of the accompanying block diagrams may be performed by computer program instructions. These computer program instructions may be embedded in a processor of a general purpose computer, a special purpose computer, or other programmable data processing apparatus.

These computer program instructions may be stored in a computer usable or computer readable memory capable of directing a computer or other programmable data processing apparatus to implement a function in a particular manner.

1A and 1B are perspective views showing an example of a see-through head-mounted display device according to the present invention. As shown in the figure, the head-mounted display device according to the present invention includes a wear part 100 to be worn on a user's head, A housing 200 mounted on the wearer 100 and positioned on the user's face and an integration module 300 connected to the housing 200.

The wearing section 100 includes a pair of glasses legs 101 and 102 which surround the user's head circumference and bands 103 and 104 which are combined with the glasses legs 101 and 102 to surround the user's head. The bands 103 and 104 can be fixed through fixing means such as a Velcro attached to one side and can be adjusted to fit the size of the user's head according to tightening of the band.

The glasses legs 101 and 102 are coupled to the housing 200 by hinge brackets 201 and 202. The joint portions connected by the hinge brackets 201 and 202 can be freely rotated and both the eyeglasses legs 101 and 102 are designed to be folded toward the housing 200 to reduce the volume during carrying.

The housing 200 has a rectangular housing shape, and a nose support portion 203 on which a nose and a nose portion of the user are seated is formed at a lower center portion, so that the height of the housing 200 can be adjusted.

The integration module 300 is connected to the electronic board inside the housing 200 through the main cable 301 and is connected between the upper cover 302 and the lower cover 303, (Not shown).

FIG. 2 is an exploded perspective view of a see-through type head-mounted display device according to the present invention, and a view-through type head-mounted display device according to the present invention will be described in detail with reference to FIG.

As shown in FIG. 2, the housing 200, which forms an outer appearance, includes a front cover 210 and a rear cover 220 to form an overall appearance. A control module 230 including a camera processor 231 for controlling the camera and a head trekker processor 232 for motion sensing is provided directly below the rear cover 220. A frame 240 is provided under the control module 230.

An optical housing 250 is provided below the frame 240 and a display module 400 is provided on the optical housing 250. The display module 400 includes a first and a second microdisplay 410, 420 and a display control board 430. The first and second microdisks 410 and 420 are installed at the lower end of the display control board 430.

A beam splitter prism 440 is installed below the optical housing 250. A first aspherical lens 450 and a second aspherical lens 460 are provided between the display module 400 and the beam splitter prism 440 and the optical axis of the first aspherical lens 450 is disposed between the first micro display 410 And the second aspheric lens 460 is located on the same axis as the center of the second microdisplay 420. [

The front cover 210 of the housing 200 protects the beam splitter prism 440 at a portion exposed to the outside and the polarizing absorption film 211 is attached to the polarization plate 212 to reduce the amount of light entering the user's eyes from the outside Respectively. A camera window 213 for exposing the sensor of the camera is located at the center of the upper part of the front cover 210. The rear cover 220 of the housing 200 is provided with a sight window 221 for protecting the beam splitter prism 440 at a portion to be worn on the user's face.

The first aspherical lens 450 and the second aspherical lens 460 in Fig. 2 are implemented with the same configuration. Therefore, an embodiment of the first aspherical lens 450 will be described, and the configuration of the second aspherical lens 460 can be understood.

3, the optical system includes an aspheric lens 450 disposed at a position adjacent to the first microdisplay 410, and an aspherical lens 450 disposed at a position adjacent to the first microdisplay 410. [ And a prism 440. The beam splitter prism 440 includes two prisms 441 and 442 and a polarizing reflective film 443 provided between the prisms 441 and 442 and a curved surface 444 provided at the lower ends of the prisms 441 and 442. [ And a polarizer 445 provided between the prisms 441 and 442 and the curved surface 444. [ The center of the surface of the first microdisplay 410 coincides with the optical axis of the first aspherical lens 450 and the curved surface 444.

The beam splitter prism 440 is installed at a position adjacent to the user's face, and the user can view the external image through the prisms 441 and 442 and the polarizing reflection film 443. [ The image of the first microdisplay 410 sequentially passes through the first aspherical lens 450, the prism 441, the polarizing reflective film 443, the prism 442, the polarizing plate 445 and the curved surface 444 . A part of the light of the image passes through the polarizing reflection film and a part of the light is reflected toward the front face of the housing 200.

The image that reaches the curved surface 444 is reflected and sequentially passes through the polarizer 445 and the prism 442 and is then reflected from the polarized reflection film 443 toward the user's eye 470. According to the above-described structure, the see-through type head-mounted display device according to the present invention simultaneously provides the user with the external image and the first microdisplay 410 image.

FIG. 4 is a block diagram of a see-through head-mounted display device according to the present invention. As shown in FIG. 2, first and second microdisplays 410 and 460 installed together with first and second aspherical lenses 450 and 460, And 420 displays an image on the upper side of the beam splitter prism 440 in a direction perpendicular to the user's line of sight.

The first and second microdisplays 410 and 420 use a 1920 x 1080 high resolution microfilm display. For example, OLEDs (Organic Light Emitting Diodes) or LCDs (Liquid Crystal Displays) can be used. The display device according to the embodiment of the present invention can be implemented as a minimum component using a scaler.

The head trekker processor 232 installed for motion sensing in the internal control module 230 of the housing 200 may perform a motion tracking operation to provide an adaptive image to move the screen together with the movement of the user's head .

A display control board 430 installed inside the housing 200 and providing images to the first and second microdisks 420 may display images on the first microdisplay 410 and the second microdisplay 420, As shown in FIG.

An external source 500 for providing a video signal to the display control board 430 may be separately provided outside the housing 200. The data transfer may be made from the external source 500 to the integration board 304 of the integration module 300 and the integration board 304 may transmit data via the main cable 301 to the display control board 300. [ (430). At this time, the external source 500 may transmit and receive data to and from the integration board 304 using a wired or wireless local area communication method such as USB or HDMI. Also, power for operation of the display module 400 and the control module 230 may be provided from the external source 500 through the integration module 300 using USB or HDMI.

FIG. 5 is a graph showing a distortion rate of an optical system provided in a see-through type head-mounted display apparatus according to the present invention. As shown in the measurement graph, a distortion ratio of about 5% . The first and second aspherical lenses 450 and 460 may be cut in the black regions of the first and second microdisplay 410 and 420 to provide a wide view, .

In addition, the optical system according to the present invention is configured to provide a field of view (FOV) of 60 degrees.

In addition, the optical system according to the present invention may be made of a plastic material. As described above, the upper and lower portions of the first and second aspherical lenses 450 and 460 and the curved surface 444 are cut, It can be light.

In addition, since the optical system according to the present invention can cut the upper and lower portions of the lens, the optical housing 250, in which the lenses are housed, can be formed in a rectangular shape, so that the size of the lens barrel can be reduced. .

Hereinafter, the operation of the see-through head-mounted display device constructed as described above according to an embodiment of the present invention will be described.

The user wears the head-mounted display device on the head portion to firmly tighten the headbands 103 and 104 to the user's head. Further, the position of the housing 200 is adjusted by adjusting the fixing positions of the spectacle legs 101, 102 and the headbands 103, 104. The nose support part 203 is provided in a different height and the user can adjust the up and down position of the head mount display by replacing the nose support part 203. [

When the first and second microdisks 410 and 420 start to operate, a video signal is transmitted from the external source 500 to the integration module 300 and the integration module 300 transmits the video signal to the main cable 301 To the display control board 430 through the display control board 430. [ The signal provided to the display control board 430 may be a signal divided into the first micro display 410 and the second micro display 420, respectively. At this time, the display control board 430 may divide the video signal so as to fit the first microdisplay 410 and the second microdisplay 420.

When a video signal is provided to the display control board 430, the display control board 430 outputs video signals to the first micro display 410 and the second micro display 420, respectively. If the head of the user moves while the video signal is being supplied to the first micro display 410 and the second micro display 420, the head trekker processor 232 senses the signal and transmits the signal to the control module 230. The camera processor 231 records an image in front of the housing 200 and transfers the information to the control module 230. [

The control module 230 transmits the sensed motion signal and the camera video signal to the integration board 304 through the main cable 201. The integration board 304 transfers signals to an external source 500 in a wired or wireless local area communication manner, such as a USB. The external source 500 calculates the motion signal, extracts the trekking image corresponding to the motion, and transmits the extracted trekking image to the display control board 430 through the imaging module 300. The display control board 430 provides a trekking image to the first microdisplay 410 and the second microdisplay 420. The external source 500 also transmits the camera image information to the display control board 430 through the imaging module 300 to provide the camera images to the first and second microdisks 410 and 420. The external source 500 may add graphics to the received camera image information and transmit it to the head mount display to provide the user with virtual graphics or other information.

The see-through type head-mounted display device according to the embodiment of the present invention uses four lenses and prisms in total, and glass or plastic can be used as the optical system material. Furthermore, the aspherical lens and the curved surfaces are cut up and down to reduce the weight of the head-mounted display device. By densifying the components applied to the circuit board, it is possible to implement without the use of additional devices such as a controller, and to distribute the concentrated weight per unit area, thereby realizing a lighter feeling to the user.

In addition, the see-through type head-mounted display device according to the embodiment of the present invention can reduce the resistance with a minimum number of components and can also use an HDMI exclusive receiver in the embodiment, So that the minimum power can be used.

Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be determined by the scope of the appended claims and equivalents thereof.

100: worn portion 101: first eye leg
102: second glasses leg 103: first band
104: second band 200: housing
201: first hinge bracket 202: second hinge bracket
203: nose support 210: front cover
211: polarizing absorption film 212: polarizing frame
213: camera window 220: rear cover
221: view window 230: control module
231: camera processor 232: head trekker processor
240: frame 250: optical housing
300: an integration module 301: a main cable
302: upper cover 303: lower cover
304: an integration board 400: a display module
410: first microdisplay 420: second microdisplay
430: display control board 440: beam splitter prism
441: first prism 442: second prism
443: polarized reflection film 444: curved surface mirror
445: polarizer 450: first aspherical lens
460: second aspherical lens 470: user's eyeball
500: External source

Claims (16)

A wearing portion to be worn on a user's head;
A housing installed in the wearer and positioned corresponding to a user's eyeball;
A display installed in the housing and positioned vertically to a direction of a user's sight to display a video signal on a screen; And
And an optical system located inside the housing in a direction of a user's sight,
The optical system includes:
A beam splitter prism disposed at a position adjacent to the display for reflecting and transmitting light of the video signal displayed by the display and a beam splitter prism disposed between the display and the beam splitter prism, An aspheric lens positioned in a direction perpendicular to the eye of the subject,
Wherein the beam splitter prism comprises:
A pair of prisms corresponding to the inclined surfaces,
A prism having a curved surface and a curved surface, the curved surface being provided at a lower end of the pair of prisms to enlarge and reflect light of an image signal incident through the prism,
And a polarizing reflection lens which is disposed between the pair of prisms and transmits the light of the image signal incident through the aspherical lens at the curved surface and reflects the light of the image signal reflected at the curved surface in the eyeball direction of the user, Film and
And a polarizing plate provided between the pair of prisms and the curved surface,
In the aspherical lens,
An upper lens having a paralle of a predetermined width formed on an upper surface facing the display and a lower lens positioned on a bottom surface of the upper lens and having a double curved surface on an upper surface contacting the bottom surface of the upper lens,
Wherein the upper and lower widths of the display are equal to or smaller than the width of the parabolic surface of the upper lens.
delete delete 2. The optical element according to claim 1, wherein the aspherical lens
And the upper and lower portions are cut so as to be reduced in the black region of the display to provide a wide view.
delete The connector according to claim 1,
Further comprising a motion sensor inside,
Wherein the motion sensor may include a gyro sensor, a mechanical sensor, and an acceleration sensor, and detects a head movement of the user.
7. The apparatus of claim 6,
Further comprising a camera inside,
Wherein the camera is installed at a position close to the user's eyes so as to photograph the same direction as the viewing direction of the user so as to record the same image as the image coming in the user's view, Head-mounted display.
8. The apparatus of claim 7, wherein the motion sensor, the camera,
Wherein the power supply and the information transmission are possible through the integrated electronic circuit, and the board for controlling the electronic circuit is configured as a separate controller board.
The display device according to claim 1,
And a second display and a second optical system corresponding to the first optical system, the right eye, and the first display corresponding to the left eye of the user.
10. The method of claim 9,
And a processor for providing an image to the first display and the second display, and an external source for providing an image signal to the processor.
11. The apparatus of claim 10,
Wherein the video signal provided from the external source is divided and provided to the first display and the second display.
The apparatus according to claim 1,
And a velcro which is fixed in the form of a spectacle on the face of the user and is fixed by wrapping the band around the ends of the legs of the user and covering the head of the user and the inside of the band is adjusted to the size of the user's head Like head-mounted display device.
13. The apparatus according to claim 12,
Further comprising a nose supporting portion which can be used by selecting a type best suited to the nose height, width and shape of the user.
The method according to claim 1,
Further comprising a window positioned in a viewing direction of the user and having an absorption type polarizing film or an absorption type polarizing coating on a front surface of the housing.
15. The method of claim 14, wherein the absorption type polarizing film or absorption type polarizing coating window comprises:
And the contrast of the virtual screen provided by the display is improved by reducing the amount of light reaching the user's eyes from the outside.
16. The method of claim 15,
Wherein the amount of light reaching a user's eye is adjusted according to an arrangement angle of the polarizing reflection film between the absorption type polarizing film and the pair of prisms.

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