KR19980079115A - Head mounted display - Google Patents

Abstract

The present invention relates to a head mount display (HMD) that can be used in language education, movies, and music listening while being worn on a user's head.

The HMD of the present invention includes one video display apparatus 11, branching means for branching the image generated from the one display apparatus into two branches, and one image of the image divided into two branches by the branching means. A first focusing lens 14 for adjusting focus, a total reflection mirror 13 for totally reflecting another image branched by the branching means to the other eye, and a size of the left and right images positioned between the branching means and the total reflection mirror And a second focusing lens 15 that adjusts the focus of the image totally reflected by the total reflection mirror.

In addition, the HMD of the present invention can reduce the cost of one video display module and additional components thereof, thereby reducing the cost of the head mounted display, and furthermore, the HMD according to the present invention can adjust the size of the left and right images by the left and right adjusting lens. You can watch better quality images.

Description

A HEAD MOUNT DISPLAY

The present invention relates to a head mount display (HMD) that can be used in language education, movies, and music listening while being worn on a user's head.

In general, a head mounted display device is developed as a type of visual output device for wearing on a user's head in a virtual reality (VR) system, and is used for various types of distribution. This HMD is an image displayed by a display device such as an LCD or a CRT. It is a device that shows to the user by using a precise optical mechanism. Such HMDs require very precise optics to focus on a very short distance and to avoid eye fatigue because the image screen is located very close to the eyes.

Such a head mounted display device is classified into a monocular type and a binocular type in view of the eye, which is the subject of vision, and a monoscopic type in view of an image, which is the object of vision. (Monoscopic type) and stereoscopic type (Stereoscopic type) is divided into, of which the binocular type (Binocular type) is widely used.

This binaural type of conventional head mount display uses two video display devices (e.g., LCD) 1, 2, as shown schematically in FIG. The video display apparatuses 1 and 2 are arranged to be positioned in front of the user's left eye 5 and right eye 6, respectively.

In addition, between the eyes 5 and 6 of the user and the two video display devices 1 and 2, a lens 3 and 4 for focusing the eye on an image screen developed on the display device are provided. Each is arranged. In addition, although not shown in the drawing to implement a three-dimensional stereoscopic image in the conventional HMD, the images coming from the two video display devices (1) (2) to both eyes (5) (6) selectively on-off (interruption) That is, it means that it is visible and invisible) so that the after-image of the left and right eyes of the user may be provided with a shutter. In other words, the three-dimensional image can be implemented by the LCD shutter method, the color filter method, the optical illusion method, and the LCD shutter method, in which two separate LCD shutters are controlled in front of the left and right eyes and alternately opened / closed. (on / off) so that only one image can be seen at a specific time. For example, while the video display screen is scanning an image corresponding to the left side, the right image is blocked, while the left image is blocked while scanning the image corresponding to the right side. To be seen. The LCD shutter method has no loss of color or bias in left and right views as in other methods, and thus a clear image can be obtained, while an electronic circuit for on-off control is required.

However, the conventional head mounted display configured as described above requires two video display devices (1, 2), which necessitates display circuits redundantly, thus increasing the weight of the head mounted display, making it inconvenient to use and costly. There was an expensive issue.

Accordingly, an object of the present invention is to provide a head mounted display which can reduce the manufacturing cost and reduce the weight by eliminating redundant display circuits.

In order to achieve the above object, the present invention provides a video display device, a branching means for bifurcating an image generated from the one display device, and an image bifurcated by the branching means. A first focusing lens for adjusting the focus of one of the images, a total reflection mirror for totally reflecting the other image branched by the branching means to the other eye side, and a size of the left and right images positioned between the branching means and the total reflection mirror And a second focusing lens for adjusting the focus of the image totally reflected by the total reflection mirror.

1 is a schematic diagram illustrating a conventional head mounted display;

2 is a schematic diagram showing a first embodiment of a head mounted display according to the present invention;

3 is a perspective view showing an application example of the first embodiment;

4 is a schematic diagram showing a second embodiment of a head mounted display according to the present invention;

5 is a perspective view showing an application example of the second embodiment.

* Explanation of symbols for the main parts of the drawings

11: video display device 12: beam splitter

13: total reflection mirror 14,15: focusing lens

16, 17: Eye 18: Left and right adjustment lens

19: image magnifying lens 20: display driving circuit

21: selector 25, 26: shutter

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

2 is a schematic view showing a first embodiment of a head mounted display according to the present invention, and FIG. 3 is a perspective view showing an application example of the first embodiment.

As shown in Figs. 2 and 3, the first embodiment of the head mounted display according to the present invention bisects an image generated from the display device 11 in front of one video display device 11 in two. Branching means is located.

The branching means is composed of a beam splitter 12 for semi-reflecting and semi-transmitting an image. An adjusting first focusing lens 14 is provided.

A total reflection mirror 13 is provided to totally reflect another image reflected by the beam splitter 12 to the other eye, and the total reflection mirror 13 is disposed between the total reflection mirror 13 and the other eye 17. The second focusing lens 15 for adjusting the focus of the totally reflected image is provided.

In addition, between the beam splitter 12 and the total reflection mirror 13, the left and right adjustment lens 18, which is moved by an adjustment mechanism (not shown), is positioned. The left and right adjustment lens 18 adjusts the size of the left and right images.

In this case, the left and right adjustment lenses are fixed by changing the size of the right and left sides by moving the left and right adjustment lenses left and right in the manufacturing process, and then fixing the positions of the left and right adjustment lenses, after which the adjustment mechanism is unnecessary.

On the other hand, the video display device 11 receives and displays the video signal of the video device such as the PC 22, VCR 23, LDP 24, etc. through the selection unit 21 and the display driving circuit 20, As the video display device 11, a liquid crystal display device (LCD), a cathode ray tube (CRT tube), or the like is used. The selector 21 selects one of the video signals output from the PC 22 or the VCR 23 and the LDP 24 and outputs the same to the display driver circuit 20, and the video display driver circuit 20 outputs the video signal. After amplifying the output signal to the video display device 11, an image is displayed on the video display device 11.

In this case, an image magnifying lens 19 for enlarging an image to be displayed may be positioned in front of the video display apparatus 11.

According to the first embodiment of the head mounted display according to the present invention configured as described above, an image generated from one video display apparatus 11 is semi-transmissive and semi-reflected by the beam splitter 12 as branching means. The image is incident on one eye 16 after the focus is adjusted by the first focusing lens 14, and the semi-reflected image is the total reflection mirror 13 after the size of the image is adjusted by the left and right adjusting lens 18. Is totally reflected back to the second focusing lens 15. The image totally reflected by the total reflection mirror 13 is incident on the other eye 17 after the focus is adjusted by the second focusing lens 15.

Therefore, the head mounted display of the present invention configured as described above is operated by one video display device 11, so that the overall weight is lighter than the conventional method of using two video display devices, and thus the user is easy to use and overlaps. By reducing the video display module, the cost can be reduced. In addition, the left and right adjustment lens can adjust the size of the left and right image, so that you can see a higher quality image.

4 is a schematic diagram showing a second embodiment of the head mounted display according to the present invention. The second embodiment applies the present invention to a three-dimensional HMD. 5 is a perspective view showing a second embodiment.

As shown in Figs. 4 and 5, the second embodiment of the head mounted display according to the present invention bisects an image generated from the video display apparatus 11 in front of one video display apparatus 11 in two. Branching means for branching is located.

The branching means is composed of a beam splitter 12 for semi-reflecting and semi-transmitting an image. A first focusing lens 14 for adjustment is located, and a first shutter 25 intermittent (on / of) by a control circuit (not shown) is provided between the first focusing lens 14 and the eye 16. do.

A total reflection mirror 13 for totally reflecting the image reflected by the beam splitter 12 as the branching means to face the other eye 17 is provided in parallel with the beam splitter 12, and the total reflection mirror ( In front of the 13, a second focusing lens 15 for adjusting the focus of the image totally reflected by the total reflection mirror 13 toward the other eye 17 is located, and the second focusing lens 15 and the eye ( Between the 17), a second shutter 26 intermittent (on / of) by a control circuit (not shown) is provided.

In addition, between the beam splitter and the total reflection mirror, a left and right adjustment lens 18, which is moved by an adjustment mechanism not shown, is positioned. The left and right adjustment lens 18 adjusts the size of the left and right images.

On the other hand, the video display device 11 receives and displays the video signal of the video device such as the PC 22, VCR 23, LDP 24, etc. through the selection unit 21 and the display driving circuit 20, As the video display device 11, a liquid crystal display device (LCD), a cathode ray tube (CRT tube), or the like is used. The selector 21 selects one of the video signals output from the PC 22 or the VCR 23 and the LDP 24 and outputs the same to the display driver circuit 20, and the video display driver circuit 20 outputs the video signal. After amplifying and outputting the video to the video display device 11, the image is displayed on the video display device (11).

According to the second embodiment of the three-dimensional head mounted display according to the present invention configured as described above, the image generated from one video display device 11 is semi-transmissive and semi-reflected by the beam splitter 12 as a branching means so that the double beam splitter The semi-transparent image 12 is directed toward one eye 16, and the image semi-reflected by the beam splitter 12 is totally reflected toward the other eye 17 by the total reflection mirror 13.

The first focusing lens 14 positioned between the beam splitter 12 and the first shutter 25 adjusts the focus of the image transmitted from the beam splitter 12, and controls the first focusing lens 14 and the eye ( The first shutter 25 installed between the 16 and 3D stereoscopic images is formed by turning on and off the image incident to the eye 16 according to a control circuit (not shown). Will be implemented.

In addition, the second focusing lens 15 located in front of the total reflection mirror 13 adjusts the focus of the totally reflected image, and the second shutter 26 located between the second focusing lens 15 and the eye 17 is illustrated. According to the control circuit that is not, the 3D stereoscopic image is realized by turning on and off the image incident to the eye 17 (that is, intermittent, that is, visually and invisible). In other words, the three-dimensional image can be implemented by the LCD shutter method, the color filter method, the optical illusion method, and the LCD shutter method, in which two separate LCD shutters are controlled in front of the left and right eyes and alternately opened / closed. Thus, only one image can be viewed at a specific time. For example, while the video display screen is scanning an image corresponding to the left side, the right image is blocked, while the left image is blocked while scanning the image corresponding to the right side. To be seen. This method requires no electronic circuits for on-off control, as in the other methods, since there is no loss of color or bias of left and right visual angles, as in other methods, a clear image is obtained.

As described above, according to the head mounted display of the present invention, since it is operated by one video display device, the weight of the head mounted display is lighter than the conventional method of using two video display devices. The cost of a single video display module and its associated circuitry can be reduced, thereby reducing the cost of a head mounted display. Furthermore, the HMD according to the present invention can adjust the size of the left and right images by the left and right adjustment lens, so that the user can see a higher quality image.

Claims (5)

One video display device 11, Branching means for branching the image generated from the one display device into two branches; A first focusing lens 14 for adjusting the focus of one of the two images divided by the branching means; A total reflection mirror 13 which totally reflects another image branched by the branching means to the other eye, A left and right adjusting lens 18 positioned between the branching means and the total reflection mirror to adjust the size of the left and right images; And a second focusing lens (15) for adjusting the focus of the image totally reflected by the total reflection mirror. 2. A head mounted display according to claim 1, wherein the branching means comprises a beam splitter (12) for semi-reflecting and semi-transmitting an image. The head mounted display according to claim 1, wherein the head mounted display further comprises an image magnifying lens (19) for enlarging the size of the displayed image in front of the video display apparatus. 2. The head mounted display according to claim 1, wherein the head mounted display includes a first shutter for controlling the video signal branched toward one eye among the video signals bifurcated by the branching means and an image totally reflected by the total reflection mirror. And a second shutter for controlling the signal in accordance with the control signal. The head mounted display device of claim 1, wherein the video display device is implemented as an LCD or a CRT.