WO2014077513A1

WO2014077513A1 - Hmd including convergent filter unit

Info

Publication number: WO2014077513A1
Application number: PCT/KR2013/008977
Authority: WO
Inventors: 하정훈
Original assignee: Ha Jeonghun
Priority date: 2012-11-16
Filing date: 2013-10-08
Publication date: 2014-05-22

Abstract

According to the present invention, an HMD including a convergent filter unit comprises: a main body unit (10); a convergent filter unit (20) disposed in the main body unit (10); and a display unit (30) disposed on the front surface of the convergent filter unit (20) and having a plurality of pixels (32). The convergent filter unit (20) has one or more capillary tube filters (22) in which a plurality of capillary tubes (21) are formed, and light filtered by the capillary tube filters (22) is converged into one point in the space of each of the capillary tube filters (22). Accordingly, it is possible to provide an HMD which is lightweight and allows real external environments and a display screen to be clearly seen at the same time.

Description

HMD with Converging Filter

The present invention relates to an HMD having a converging filter unit, and more particularly, to an HMD having a converging filter unit for displaying a display screen clearly regardless of the thickness of the lens.

Recently, a head mounted display (HMD), which is a device that can be worn on the head like an eyeglass and has the effect of viewing a large screen, is being developed.

However, when the display is installed in a small HMD, such as glasses, there is a problem that the image cannot be properly formed at one point of the retina because the display is too close to the eyes.

1 and 2 are conceptual diagrams for explaining the state when viewing the object with the eyes.

As shown in FIG. 1, when the object 1 is at an appropriate distance from the eye, the light from the object passes through the cornea 2 and the lens 3 and then converges at a point on the retina 4 so that the object Looks sharper. On the other hand, as shown in FIG. 2, when the object is very close to the eye, for example, about 1 to 2 cm away from the eye, light emitted from the object 1 passes through the cornea 2 and the lens 3. After that, the point of convergence cannot be converged to one point of the retina 4, so that the object looks blurry.

In order to solve such a problem, the existing HMD substantially secures the optical path reaching the eye by reflecting the light from the display several times using an optical device such as a prism.

For example, as shown in FIG. 3, the HMD disclosed in “Patent Document 1” reflects light emitted from the display 5 through the free-curved prism 6, thereby forming a clear image on the retina. Similarly, Google Glass, a Google-developed HMD, uses a method of increasing the actual light path by reflecting light several times inside the prism.

For example, MOVERIO BT-100, an HMD developed by Abson, refracts and reflects light from a beam projector (display) and sends it to the eyes, allowing clear images to form on the retina.

However, the HMD of the above method has a depth when viewing the display screen (generally, the depth means the distance to a subject where a clear image can be formed), and thus, the user must adjust the thickness of the lens to match the depth of the image. You can watch the video. Therefore, when the user views the actual external environment and the display screen at the same time, when the user focuses on the external environment, the display screen is blurred, and when the user focuses on the display screen, the external environment is blurred. Therefore, HMD of the above method is difficult to see the actual external environment and the display screen at the same time is disadvantageous for the implementation of augmented reality.

In addition, since the HMD of the above method includes a bulky and heavy optical device such as a prism, it is difficult to maintain the wearing state of the HMD due to the weight of the HMD, and there is a problem in that the user feels uncomfortable when wearing the HMD.

[Preceding technical literature]

[Patent Documents]

(Patent Document 1) KR 10-2009-0099576 A (2009. 09. 22.)

The present invention has been made to solve the above problems, the problem to be solved in the present invention is to provide an HMD that can see the actual external environment and the display screen at the same time clearly and light weight.

HMD having a convergent filter unit according to the present invention for solving the above problems is the body portion; A converging filter unit installed in the body part; Is installed in front of the converging filter unit, and comprises a display unit having a plurality of pixels, wherein the converging filter unit includes at least one capillary filter having a plurality of capillaries are formed, the light filtered by the capillary filter is capillary It is a technical feature that the filter converges to a point in space.

HMD having a convergent filter unit according to the present invention has the advantage of being able to clearly see the actual external environment and the display screen at the same time and light weight.

1 and 2 is a conceptual diagram for explaining the state when viewing the object with the eyes

3 is a conceptual diagram of a conventional HMD

4 is a perspective view of an HMD having a converging filter unit according to the present invention;

Figure 5 is a vertical cross-sectional view of the HMD having a converging filter unit according to the present invention

6 shows a first embodiment of a convergent filter part according to the present invention.

7 shows a second embodiment of the convergent filter part according to the present invention.

8 to 12 are conceptual diagrams for explaining the use state of the HMD having a convergent filter unit according to the present invention;

Hereinafter, the HMD provided with a convergent filter unit according to the present invention will be described in more detail with reference to the accompanying drawings.

The present invention relates to an HMD having a converging filter part, FIG. 4 is a perspective view of an HMD having a converging filter part according to the present invention, and FIG. 5 is a vertical sectional view of an HMD having a converging filter part according to the present invention.

The HMD having the convergent filter unit according to the present invention includes a body unit 10, a convergent filter unit 20, and a display unit 30.

As shown in Fig. 4 and 5, the body portion 10 of the HMD having a converging filter portion according to the present invention is composed of a frame 12 and the lens 14 of the eyeglass frame shape, the center of the lens 14 The convergent filter unit 20 and the display unit 30 are installed.

In the embodiment shown in FIG. 4, the convergent filter unit 20 and the display unit 30 are provided in both the left and right lenses 14, but only one lens 14 has the convergent filter unit 20 and the display unit 30. ) May be installed. At this time, the lens 14 on which the convergent filter unit 20 and the display unit 30 are installed is formed of an opaque plastic material or the like so that the external environment is not visible toward the convergent filter unit 20 and the display unit 30. You can only see the display screen.

The frame 12 has a spectacle frame shape that is easy for a user to wear, and firmly supports the lens 14. The material of the frame 12 may be metal or synthetic resin like general glasses.

The lens 14 is a concave lens, a convex lens, or a flat lens without a degree of power, like a lens of ordinary glasses, and may be a colored lens such as a lens of sunglasses.

Fig. 6 is a first embodiment of the convergent filter part according to the present invention. Fig. 6 (a) is a perspective view of the first embodiment, and Fig. 6 (b) is a sectional view of the first embodiment.

The converging filter unit 20 is a component that filters incident light so as to converge to a point (A, hereinafter, 'focal') in space, and a capillary tube in which a plurality of capillary tubes 21 are inclined at a predetermined angle. It comprises one or more filters 22.

The capillary filter 22 is an optical member through which the capillaries 21 are arranged at predetermined intervals so as to pass only light that can go straight through the capillary tube 21. The capillary filter 22 filters the light incident to the capillary filter 22 to form a center of the capillary tube 21. Only pass components parallel to the axis. In general, the reason for the blurring of an object is that when light emitted from the object passes through the lens and forms in the retina, as shown in FIG. 2, the light converges at one point of the retina because light is introduced into the eye over the entire area of the pupil. Because you can not. By the way, the light passing through the capillary filter 22 is limited to a very narrow beam width has the same effect as convergence at one point when reaching the retina. It is as if light is introduced only along the upper dotted line of FIG. 2.

Since the capillary filter 22 passes light only at the portion where the capillary tube 21 is formed and the rest should block light, the material must be an opaque material through which light cannot pass, and the capillary tube 21 is connected to the capillary filter 22. It is preferable that it is a formed cylinder-shaped or polygonal-shaped hole. However, the capillary tube 21 does not have to be a hollow structure, and only needs to be able to transmit light, so that the transparent medium may be filled in a cylindrical or polygonal hole. When the capillary tube 21 is filled with a transparent medium in a cylindrical or polygonal hole, there is an advantage that the capillary tube 21 is more resistant to impact on the side than when the capillary tube 21 has a hollow structure.

As shown in FIG. 7, the capillary filter 22 may have a structure in which each capillary tube 21 is inclined at a predetermined angle so that an extension line extending in the longitudinal direction of the capillary tube 21 may be collected at a focal point. In this case, the reason why the capillary tube 21 is formed to be inclined at a predetermined angle is that the light passing through the capillary filter 22 travels in the direction of the central axis of the capillary tube, so that the light passing through each capillary tube 21 is collected at one point. To get into the eye. This light propagation is also possible with the combination of the capillary filter 22 and the convex lens of another embodiment.

Fig. 7 is a second embodiment of the convergent filter part according to the present invention, Fig. 7 (a) is a perspective view of the second embodiment, and Fig. 7 (b) is a sectional view of the second embodiment. Since light passing through the capillary filter 22 shown in FIG. 7 proceeds in parallel after passing through the capillary tube 21, all of the light cannot flow into the eye. Therefore, by passing the parallel light passing through the capillary tube 21 through the convex lens 24 installed in front of the capillary filter 22, the light passing through each capillary tube 21 can be collected at the focal point A and flow into the eye. Make sure

That is, in the present invention, the converging filter part 20 may be formed of only one or more capillary filters 22 formed so that the extension lines of the central axis of the capillary tube 21 are concentrated at the focal point, or one or more capillary filters 22 having the capillary tubes 21 parallel to each other. And a convex lens 24 provided on the front surface of the capillary filter 22. Since the optical properties of these embodiments do not differ greatly, the following description will focus on the first embodiment.

The display unit 30 may be implemented as LCD, LED, or OLED. In order to drive the display unit 30, a control unit and a power supply unit are required, but this can be easily implemented by a person of ordinary skill in the art and is not a technical feature of the present invention.

8 to 12 are conceptual views for explaining a state of use of the HMD having a convergent filter unit according to the present invention. The eyeball B has a lens B1, a pupil B2, and a retina B3.

As shown in FIG. 8, when one capillary tube 21 is correspondingly disposed on one pixel 32 of the display unit 30, light from one pixel 32 is focused while passing through the capillary tube 21. You will be directed to. Therefore, since light emitted from one pixel 32 reaches a point of the retina B3, a clear image may be recognized, and the depth of field may be infinite. That is, a clear image is formed at one point of the retina regardless of the thickness of the lens.

If the focal point of the converging filter unit 20 is located in the pupil B2, when the position of the pupil B2 is changed by moving the eyeball B, light passing through the converging filter unit 20 cannot be introduced into the eye. . That is, even if the eyeball B is moved a little, the display screen is invisible. Therefore, as shown in FIG. 9, the focal point A is preferably located behind the pupil B2. In this case, even though the eye B is slightly moved, the light passing through the converging filter unit 20 can enter through the pupil B2, so that eyes can see the display screen. That is, when the focal point A of the convergent filter unit 20 is positioned behind the pupil B2, the range in which the eyeball B can move is increased.

As shown in FIG. 10, when the focal point A of the converging filter unit 20 is positioned ahead of the pupil B2, the light passing through the converging filter unit 20 may move even if the eye B is slightly moved. There is an advantage that the eyes can see the display screen by entering through the pupil B2, but there is a problem that the moving direction of the eyeball B and the moving direction of the display screen are different. For example, when the eyeball B is moved to the right, the screen on the left side is displayed more than the original display screen.

In addition, as illustrated in FIG. 11, a plurality of capillary filters 22 may be installed to allow light passing through each capillary filter 22 to converge at different focal points A1, A2, and A3 (FIG. In FIG. 11, the capillary filter 22 is divided into three parts for the sake of simplicity, but in actual application, the capillary filter 22 is divided into three parts horizontally and three parts vertically so that a total of nine capillary filters 22 are installed and each Light passing through capillary filter 22 can be converged to different foci.

At this time, even if the eyeball B moves, a part of the light passing through the converging filter unit 20 may pass through the pupil B2, thereby increasing the range in which the eyeball B can move. In this case, one display unit 30 corresponding to each capillary filter 22 may be installed for each capillary filter 22, or only one display unit may be installed as illustrated in FIG. 11.

The display unit 30 according to the present invention is preferably a transparent display. Although the display unit 30 is a transparent display, a part of the light passing through the display unit 30 is blocked by the converging filter unit 20 and the display unit 30, but some of the light is blocked by the converging filter unit 20 and the display. Since the display unit 30 passes through the display unit 30, the user can see the subject behind the display unit 30. In addition, as shown in FIG. 12, even if light a incident toward the display unit 30 is blocked by the converging filter unit 20 and the display unit 30, the lens 14 may be a convex lens. Since the light b incident to) may normally reach the pupil B2, the user may see the subject behind the display unit 30. Therefore, the light from the actual external environment (subject) and the light from the display screen overlap the retina, and the user can recognize the actual external environment (subject) and the display screen at the same time, which is advantageous for implementing augmented reality. . At this time, since the display screen has no depth, a clear display screen can be seen even if the user's eyes change the thickness of the lens in accordance with the actual external environment.

Further, the convergent filter unit 20 and the display unit 30 may be provided only in one lens 14 of the two left and right lenses 14 of the HMD having the convergent filter unit. In this case, the eye of the side where the convergent filter unit 20 and the display unit 30 are installed can see the display screen, and the opposite eye can see the actual external environment. For example, if the convergent filter unit 20 and the display unit 30 are installed in the left lens 14 and the convergent filter unit 20 and the display unit 30 are not installed in the right lens 14, Can see the display screen and the right eye can see the actual external environment. While looking at the actual external environment with the right eye, if the lens thickness of the right eye changes in accordance with the distance from the external object to the right eye, the thickness of the lens of the left eye may be unknowingly changed. The HMD having the converging filter unit according to the present invention Even when the lens thickness of the eye changes, the display screen may be clearly recognized. This is because the light from the display unit 30 passes through the converging filter unit 20 and the depth becomes infinite.

Since the HMD having the convergent filter unit according to the present invention may provide different display screens on the left and right sides when the convergent filter unit 20 and the display unit 30 are installed in each of the left and right lenses 14, the parallax may be reduced. The stereoscopic screen used can be provided. Providing a stereoscopic image with an HMD having a converging filter unit according to the present invention has the following advantages.

When viewing a stereoscopic image by a device for providing a stereoscopic image, the eye cannot be focused on the protruding image. This is because when the lens is thickened to view the protruding image, the background image appears blurred. In other words, the lens should continue to focus on the background while watching stereoscopic images. However, when viewing a stereoscopic image with an HMD having a converging filter unit according to the present invention, a clear protrusion image can be seen even if the lens is thickened to view the protrusion image. When using the HMD provided with a converging filter unit according to the present invention, since the depth of the display screen becomes infinite, a clear image is formed on the retina even if the thickness of the lens is changed.

[Description of the code]

10: body 12: frame

14: lens 20: convergent filter unit

21: capillary 22: capillary filter

24: convex lens 30: display unit

32: pixel

Claims

Body portion 10;

A converging filter part 20 installed on the body part 10;

It is installed in front of the convergent filter unit 20, and comprises a display unit 30 having a plurality of pixels 32,

The converging filter unit 20 includes at least one capillary filter 22 having a plurality of capillary tubes 21 formed thereon, so that the light filtered by the capillary filter 22 is spaced by the capillary filter 22. HMD having a converging filter portion, characterized in that to converge to the point.
The method according to claim 1,

The body portion 10 is composed of a frame 12 and a lens 14 installed on the frame 12,

HMD having a converging filter unit, characterized in that the converging filter unit 20 and the display unit 30 is installed in the lens (14).
The method according to claim 1,

The capillary filter (22) HMD having a converging filter unit, characterized in that each capillary tube (21) is formed to be inclined at a predetermined angle so that the extension lines of the central axis of the capillary tube (21) are collected at a point in space.
The method according to claim 1,

The converging filter unit 20 is composed of at least one capillary filter 22 having a plurality of capillaries 21 formed in parallel and a convex lens 24 installed at the front of the at least one capillary filter 22. HMD provided with a converging filter unit.
The method according to claim 3 or 4,

The capillary tube 21 is HMD having a converging filter portion, characterized in that disposed corresponding to the pixel (32).
The method according to claim 1,

The display unit 30 is HMD having a convergent filter, characterized in that the transparent.