KR102072008B1 - Head mounted display device - Google Patents

Abstract

The present invention relates to a head mount display device capable of providing virtual reality or augmented reality to both eyes of a user by using only one reflective display. More specifically, the head mount display device comprises: a backlight generating light; a polarization separator polarizing the light emitted from the backlight and emitting the polarized light; a reflective display generating an image by reflecting the light polarized by the polarization separator; a first phase retardation plate changing a polarization state of the light emitted from the reflective display; a half mirror laterally reflecting a part of the light transmitted through the phase retardation plate and transmitting the remaining light; a full mirror laterally reflecting the remaining light transmitted through the half mirror; a first prism module enlarging and guiding the light reflected from the half mirror; and a second prism module enlarging and guiding the light reflected from the full mirror.

Description

HEAD MOUNTED DISPLAY DEVICE}

The present invention relates to a head mounted display device for smart glasses used to simultaneously or selectively implement augmented reality and virtual reality, and in particular, by providing content to both eyes simultaneously while using one display element, smart glasses The present invention relates to a head mounted display device capable of lowering the manufacturing cost of the product and reducing fatigue and dizziness of the user.

Virtual Reality (VR) is a technology that creates a virtual environment and makes it feel like reality, and Augmented Reality (AR) is a technology that expresses virtual information on the surrounding environment that is actually visible. (AR) and Virtual Reality (VR) are a concept of Reality-Virtuality Continuum that combines reality and virtual information simultaneously to build an environment, Mixed Reality (MR), Augmented Virtual (AV) ) Is developing in the form.

Recently, smart glasses that can provide such virtual reality or augmented reality to users are widely used not only in the industrial field but also in various external activities such as games and leisure.

The head mounted display is mounted on a frame of a smart glass having an appearance similar to that of glasses, and provides contents such as an image to be delivered to a user. It is common to include various optical systems for delivering an image to the user's eyes. In conventional smart glasses using a head mounted display, two or more display elements are generally used to provide an image to both eyes of a user. That is, a method of generating an image for providing to each eye through a separate display element and transferring the generated image to each eye is common.

As a result, a large number of display elements are required to produce an image to be simultaneously provided to both eyes, resulting in an increase in manufacturing costs, and a complicated structure for placing a large number of parts, resulting in complexity and yield of a manufacturing process. There was a problem that a decrease occurs.

Furthermore, since the images provided to each eye are generated by separate display devices, color differences such as white balance, saturation, and chromaticity, which are inevitably generated according to the characteristics of the display devices, are generated, and thus the brightness is different. There was a problem causing discomfort and dizziness, and there was a problem that a higher cost was required to eliminate the difference between the images provided to the two eyes.

On the other hand, as a result of the use of multiple display elements, if a failure occurs in any one of the display elements, this immediately leads to a failure of the entire device, thereby reducing the life of the product.

Republic of Korea Patent Publication No. 10-2015-0062222 (2015.06.08)

An object of the present invention is to provide a head mounted display device capable of providing virtual reality or augmented reality to both eyes while using only one display device.

In another aspect, the present invention provides a head-mounted display device that can reduce the discomfort and dizziness of the user caused by the conventional method using a plurality of display devices by providing the same image generated in one display device to both eyes at the same time It aims to provide.

A head mounted display device according to the present invention includes a backlight for generating light, a polarizer for polarizing light emitted from the backlight, a reflective display for generating an image by reflecting light polarized by the polarizer, and the reflection A first phase delay plate for changing the polarization state of the light emitted from the display, a half mirror for reflecting part of the light transmitted through the phase delay plate laterally and transmitting the remaining light, A full mirror for laterally reflecting the remaining light, a first prism module for enlarging and guiding the light reflected from the half mirror, and a second prism module for enlarging and guiding the light reflected from the full mirror; Characterized in that.

The half mirror may reflect light transmitted through the phase delay plate in a lateral direction while expanding in a horizontal direction. The full mirror may reflect the remaining light passing through the half mirror laterally while expanding in the horizontal direction.

Each of the first prism module and the second prism module includes a first wedge prism and a second wedge prism having an inclined surface, wherein the first wedge prism extends the incident light in a vertical direction, and the second wedge prism is an inclined surface. It may be disposed to face the inclined surface of the first wedge prism. The traveling direction of the light reflected from the half mirror and the traveling direction of the light reflected from the full mirror may be parallel.

At least one collimating lens may be further disposed between the half mirror and the full mirror, and a gap adjusting means may be further included to adjust a gap between the half mirror and the full mirror. At least one collimating lens may be disposed in the gap adjusting means.

The half mirror may be characterized by refracting and reflecting about 50% of the amount of incident light in a perpendicular direction. The half mirror may separate the incident light according to the polarization component, thereby refracting and reflecting the light of the first polarization component in a perpendicular direction, and transmitting the light of the second polarization component.

A first magnification lens may be further disposed between the half mirror and the first prism module, and a second magnification lens may be further included between the full mirror and the second prism module.

Since the head mounted display device according to the present invention generates an image using only one reflective display, there is an advantage of preventing discomfort and dizziness of a user generated in a conventional head mount display device using a plurality of displays. .

In particular, the number of displays is reduced, manufacturing costs are reduced, and the configuration of the device is simplified, making it easy to manufacture and reducing the weight of the device has the advantage of enabling more convenient use.

1 is a block diagram of a head mounted display device according to the present invention.
FIG. 2 is a conceptual diagram illustrating a process in which light is reflected on the inclined surfaces of the half mirror, the full mirror, and the wedge prism to be enlarged.
3 is a block diagram of a prism module according to the present invention.
Figure 4 shows the structure of the wedge prism formed with the saw-toothed expansion means according to the present invention.
5 is a partial configuration diagram of a head mounted display device including a shade according to the present invention.
6 is a block diagram of a shade according to the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present invention, the terms 'comprise' or 'having' are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram of a head mounted display device 100 according to the present invention. As shown in FIG. 1, the head mounted display device 100 according to the present invention includes a backlight 1, a polarizer 2, a reflective display 3, a phase delay plate 4, and a first collimating lens. (5), half mirror (6), full mirror (7), first prism module (8) and second prism module (9). In addition, at least one second collimating lens 10 and the binocular distance adjusting unit 11 may be disposed between the half mirror 6 and the full mirror 7. Further, the first magnification lens 12 disposed between the half mirror 6 and the first prism module 8 and the second magnification lens 13 disposed between the full mirror 7 and the second prism module 9. ).

In the head mounted display apparatus 100 according to the present invention, an image provided to both eyes of a user is generated in one reflective display 3 arranged at one side. The image generated in one reflective display 3 is branched and delivered to both eyes of the user. The branched light is guided while passing through the first prism module 8 and the second prism module 9 and transmitted to one eye of the user, respectively. Therefore, it is possible to simultaneously provide the same image to both eyes of the user while using one reflective display 3 arranged on one side.

In FIG. 1, the backlight 1 refers to a light source, and may be an LED backlight that may sequentially generate RGB light.

The polarization splitter 2 is an optical device that separates input light according to a polarization state, and may be a polarization beam splitter. That is, the polarization separator 2 transmits the polarization component of any of the polarization components constituting the input light as it is, but reflects the other polarization component in the perpendicular direction. Therefore, the light incident on the polarizer 2 splits into two paths depending on the polarization state. In general, light that is not polarized includes a first polarization component and a second polarization component. The first polarization component may mean P-polarized light, and the second polarization line may mean S-polarized light. On the contrary, the first polarization component may mean S-polarized light and the second polarization line may mean P-polarized light. When light including both the first polarization component and the second polarization component is incident on the polarization separator 2, the first polarization component is transmitted as it is, and the second polarization component is reflected in the perpendicular direction.

The phase delay plate 4 is an optical element for changing the polarization state of incident light, and may be a λ / 4 wave plate. That is, the light in the linearly flat state is converted into circularly polarized light while passing through the phase delay plate 4, and the light in the circularly polarized state is converted into the linearly polarized state when passing through the phase delay plate 4.

Light generated by the backlight 1 and exited is incident on the polarization separator 2. The light generated and emitted from the backlight 1 is generally not polarized in a specific direction and includes both a first polarization component and a second polarization component. The polarization separator 2 polarizes the incident light and transmits the incident light to the reflective display 3. That is, with respect to the incident light, only one polarization component is reflected in the perpendicular direction and transmitted to the reflective display 3. The reflective display 3 is a display in which an image is generated using external light, and may be a liquid crystal on silicon (LCoS).

The light emitted from the reflective display 3 passes through the polarization separator 2 and then passes through the first collimating lens 5 to be incident on the phase delay plate 4. The first collimating lens 5 converts the light in the spread state into a parallel state by reducing the light aberration. In general, the light emitted from the reflective display 3 is spread as it proceeds, and is adjusted to parallel light by the first collimating lens 5 and then incident to the phase delay plate 4.

The phase delay plate 4 receives the light emitted from the first collimating lens 5 and changes the polarization state to emit the light. The light incident on the phase delay plate 4 may be in a linearly polarized state, and the polarization state may be changed in the phase delay plate 4 to be emitted in a circularly polarized state. Light emitted from the phase delay plate 4 is transmitted to the half mirror 6.

The half mirror 6 is an optical element that reflects part of the incident light but transmits the rest. The half mirror 6 may reflect about 50% of the amount of incident light and transmit the remaining 50%. The half mirror 6 may be a polarizing beam splitter. That is, the half mirror 6 transmits one of the polarization components constituting the input light as it is, but reflects the other polarization component. The half mirror 6 may be in the form of a wedge prism having one inclined surface, and the reflection in the half mirror 6 may be made on the inclined surface of the wedge prism. Light incident on the half mirror 6 may be reflected in a direction perpendicular to the direction in which the light is incident on the half mirror 6.

The light transmitted through the half mirror 6 is transmitted to the full mirror 7 through the second collimating lens 10, and the light reflected from the half mirror 6 passes through the first magnification lens 12. It is delivered to the prism module (8). Like the first collimating lens 5, the second collimating lens 10 reduces the aberration of the light passing through the half mirror 6 and transmits it to the full mirror 7 in order to adjust it in the form of parallel light.

At least one second collimating lens 10 may be disposed between the half mirror 6 and the full mirror 7. The number of second collimating lenses 10 disposed between the half mirror 6 and the full mirror 7 may be one or two or more. An appropriate number of second collimating lenses 10 may be selected according to the distance between the half mirror 6 and the full mirror 7. That is, an appropriate number may be selected in consideration of the extent to which the light passing through the half mirror 6 is spread and the distance between the full mirror 7 and the half mirror 6, and considering the size of the device, two are arranged. It is desirable to.

The binocular distance adjusting unit 11 may be disposed between the half mirror 6 and the full mirror 7. The binocular distance adjusting unit 11 adjusts the distance between the half mirror 6 and the full mirror 7 so that the light is reflected at right angles from the half mirror 6 and the full mirror 7. To adjust the distance. The binocular distance adjusting unit 11 may have various stage shapes that can vary the length. Meanwhile, the second collimating lens 10 disposed between the half mirror 6 and the full mirror 7 may be attached to the binocular distance adjusting unit 11.

The full mirror 7 is a mirror that reflects all incident light. The full mirror 7 may be in the form of a wedge prism having one inclined surface, and the reflection in the full mirror 7 may be made on the inclined surface of the wedge prism. Light incident on the full mirror 7 may be reflected in a direction perpendicular to the direction in which the light is incident on the full mirror 7. The direction in which the light reflected by the full mirror 7 travels and the direction in which the light reflected by the half mirror 6 travels are preferably parallel to each other.

In the process of reflecting light in the half mirror 6 and the full mirror 7, light magnification occurs. FIG. 2 is a conceptual diagram for explaining the enlargement of light made in the process of reflecting light from the half mirror 6 and the full mirror 7. As shown in FIG. 2, the light incident on the half mirror 6 or the full mirror 7 passes through the mirrors 6 and 7 and enters the inclined surfaces of the mirrors 6 and 7, and the reflection is inclined on the inclined surfaces. do. In this case, as shown in FIG. 2, when the position of the light is changed on the cross section of the light, the position of the light is changed on the inclined surface where the reflection occurs. As a result, the light is enlarged in the first direction. The first direction means the same direction as the direction in which the inclined surfaces of the mirrors 6 and 7 extend while inclining.

The light reflected by the half mirror 6 is transmitted to the first prism module 8 through the first magnification lens 12, and the light reflected by the full mirror 7 is made through the second magnification lens 13. 2 is transmitted to the prism module (9).

The first magnification lens 12 and the second magnification lens 13 are lenses for additionally enlarging the light reflected from the half mirror 6 and the full mirror 7, respectively, in either the vertical direction or the horizontal direction. Lenses that magnify light may be used, and lenses that simultaneously magnify in the horizontal and vertical directions may be used. The light magnified through the first magnification lens 12 and the second magnification lens 13 is incident on the first prism module 8 and the second prism module 9, respectively. 3 is a configuration diagram of the prism modules 8 and 9 according to the present invention. The prism modules 8 and 9 are optical modules for guiding the user's eyes while enlarging the light, and each prism module 8 and 9 has two wedge prisms 14 and 15 as shown in FIG. Include. Each wedge prism 14, 15 is formed in a structure having an inclined surface.

2 and 3, the extending direction of the inclined surfaces formed on the mirrors 6 and 7 and the extending direction of the inclined surfaces formed on the wedge prisms 14 and 15 are perpendicular to each other. Accordingly, the mirrors 6 and 7 enlarge the incident light in the first direction, and the wedge prisms 14 and 15 enlarge the light in the same manner as the mirrors 6 and 7, but the direction of enlarging the first direction Becomes a second direction which is a direction forming a right angle. The magnified image passing through the mirrors 6 and 7 and the wedge prism 14 and 15 is transmitted to the user's eyes. Hereinafter, referring to FIGS. 2 and 3, the first direction in the process of explaining the enlargement of light in the mirrors 6 and 7 and the wedge prisms 14 and 15 is in the horizontal direction, and the second direction is in the vertical direction. To be called.

An enlarged means may be formed on the inclined surface of the first wedge prism 14. The enlarging means may be a holographic optical element (HOE), which may be formed by laser processing the inclined surface of the first wedge prism 14. As shown in FIG. 4, the expanding means may have a form in which the inclined surface is processed into a sawtooth shape. The expanding means corrects the path of the light so that the light reflected from the inclined surface can be incident perpendicularly to the bottom surface of the first wedge prism 14.

As shown in FIG. 3, the second wedge prism 15 is disposed such that the inclined surface faces the inclined surface of the first wedge prism 14. The inclined surfaces of the second wedge prism 15 and the first wedge prism 14 may be disposed to abut each other. The second wedge prism 15 is to prevent distortion of an image, and the inclined surface of the second wedge prism 15 may vary depending on the shape of the enlargement means formed on the inclined surface of the first wedge prism 14. That is, when the vertical diffusion means formed in the first wedge prism 14 is a holographic optical element, the inclined surface of the second wedge prism 15 may be a plane. If the diffusion means formed in the first wedge prism 14 is a serrated surface, the inclined surface of the second wedge prism 15 may engage with the saw tooth shape formed in the inclined surface of the first wedge prism 14. It may be shaped. That is, the inclined surface of the second wedge prism 15 is formed in the same shape as the sawtooth formed on the surface of the inclined surface of the first wedge prism 14 but is formed to have an inverse phase so that the first and second wedge prisms 14 and 15 are inclined. The sawtooth shape formed on the inclined surface of the can be formed to mesh with each other.

As shown in FIG. 5, the head mounted display apparatus 100 according to the present invention may include a shade 20 capable of transmitting or blocking external light. Shade 20 is a shield composed of a translucent or light diffusing material and may be formed of a plastic LCD. 6 is a detailed configuration diagram of the shade 20 formed of the plastic LCD.

As shown in FIG. 6, the shade 20 includes an upper flexible transparent film 21 on which the upper transparent electrode 23 is formed, a lower flexible transparent film 22 on which the lower transparent electrode 24 is formed, and an upper transparent. The liquid crystal layer 25 formed between the electrode 23 and the lower transparent electrode 24, the sealant 26 used to seal the LCD panel, and the spacer 27 maintaining the gap of the liquid crystal layer 25 therein. The connector 28 may include an electrical signal applied to the upper transparent electrode 23 and the lower transparent electrode 24.

The transparent electrodes 23 and 24 may function as a screen or a lens of the head mounted display device 100, and the upper and lower flexible transparent films 21 and 22 may be used as plastic substrates.

A flexible transparent film (21, 22) is a polycarbonate (PC), polyimide (PI), and a transparent plastic material having an isotropic, such as cyclo-olefin polymer (COP) can be used, 10 ^-3 g / day to 10 ^{- It} can have a moisture permeability of ⁶ g / day. It is preferable that the thickness of the flexible transparent films 21 and 22 is 30-300 micrometers, and the transparent electrodes 23 and 24 are formed in one surface.

The transparent electrodes 23 and 24 may be formed of metal oxides such as ITO, IZO, and AZO. The transparent electrodes 23 and 24 preferably have a transmittance of 80% or more for light having a wavelength of 550 nm, and a thickness of 5 to 500 nm.

The sealant 26 may be formed of a single layer of organic or inorganic thin film or a laminate thereof, wherein the inorganic thin film layer used may be formed by sputtering, PECVD or PEALD, and the organic thin film layer may be a doctor blade, spin coating, or gravure coating. It can be formed by various organic film forming methods, such as printing. As the material of the inorganic thin film layer, SiO ₂ , Al ₂ O ₃ , SiNX, SiC, SiOC, SiON, or the like may be used. The thickness of the inorganic thin film layer is preferably 5 to 1000 nm. As the material of the organic thin film layer, a Si-based compound, an acrylic, or a urethane may be used, and the thickness is preferably 5 to 5000. On the other hand, the spacer 27 is preferably formed to have a thickness of 5㎛ or less.

Since the shade 20 having the above-described structure is disposed in front of the first wedge prism 14 as shown in FIG. 5, one shade is disposed in front of both eyes. The shades 20 arranged one by one in front of both eyes may be controlled to independently transmit or block light. That is, the image generated by the head mounted display device according to the present invention may be controlled to be delivered to only one of both eyes of the user. As such, if the image is transmitted to only one side of the user while rapidly changing the light transmission or blocking state of the shade 20, the user will eventually see the 3D image.

Meanwhile, although FIG. 5 illustrates a case where the shade 20 is disposed in front of the first wedge prism 14, the 3D image may be realized by moving the shade 20 to various positions on the optical path. For example, the light incident on the first and second magnification lenses 12 and 13 and disposed at the front or the rear of the first and second magnification lenses 12 and 13 or the first and second magnification lenses 12, The light emitted from 13 may be transmitted. It may also be arranged between the phase delay plate 4 and the half mirror 6. That is, as long as the position on the optical path in which the final polarization state where the light is incident to both eyes of the user is maintained, it may be variously arranged to provide a 3D image.

As mentioned above, although the invention which concerns on this invention was demonstrated concretely according to the Example, this invention is not limited to the said Example, Of course, various deformation | transformation is possible in the range which does not deviate from the summary of invention.

1: backlight 2: polarizer
3: reflective display 4: phase delay plate
5: first collimating lens 6: half mirror
7: Full Mirror 8: First Prism Module
9: second prism module 10: second collimating lens
11: binocular spacing adjusting unit 12: the first magnifying lens
13: 2nd magnifying lens 14: 1st wedge prism
15: second wedge prism 20: shade
21: upper flexible transparent film 22: lower flexible transparent film
23: upper transparent electrode 24: lower transparent electrode
25 liquid crystal layer 26 sealant
27: spacer 28: connector
100: head mounted display device

Claims (6)

A backlight generating light;
A polarization separator that polarizes the light emitted from the backlight and emits the light;
A reflective display for reflecting light polarized by the polarizer to generate an image;
A phase delay plate for changing a polarization state of light emitted from the reflective display;
A half mirror for reflecting a part of the light transmitted through the phase delay plate in a right direction and transmitting the remaining light;
A full mirror for reflecting all the light transmitted through the half mirror in a direction perpendicular to the direction of travel of the light reflected from the half mirror;
A first prism module provided in the half mirror at a right angle to enlarge and guide the light reflected from the half mirror;
A second prism module provided in the full mirror at a right angle to enlarge and guide the light reflected from the full mirror;
A binocular distance adjusting unit provided between the half mirror and the full mirror to adjust a distance between the half mirror and the full mirror, and having a plurality of collimating lenses for reducing the aberration of the light to convert the spread light into a parallel state;
First and second magnifying lenses respectively provided between the mirrors and the prism modules to further enlarge the light transmitted to each prism module;
And a shade for generating a 3D image by providing light of the final polarization state emitted from the phase delay plate to a path of light incident to both eyes of a user.
The method of claim 1,
And the half mirror reflects light transmitted through the phase delay plate in a direction perpendicular to the horizontal direction.
The method of claim 1,
The full mirror is a head-mount display device, characterized in that for reflecting the remaining light passing through the half mirror in a direction perpendicular to the horizontal direction.
The method of claim 1,
Each of the first prism module and the second prism module includes a first wedge prism and a second wedge prism having an inclined surface,
And the first wedge prism extends the incident light in a vertical direction, and the second wedge prism is arranged such that an inclined surface faces an inclined surface of the first wedge prism.
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