KR100287711B1 - Single Head Mounted Display Units - Google Patents

Abstract

The present invention can simplify the configuration by forming images of the same size in the left and right eyes by changing the shape of the left and right eyepieces, and an image incident on the left and right eyes by using a partial reflection mirror that can adjust the ratio of reflection and transmission. A single panel head mounted display device capable of the same brightness,

A liquid crystal (LCD) panel for displaying an image, a backlight disposed behind the liquid crystal panel to emit white light to the liquid crystal panel, and a ratio of light passing through the liquid crystal panel to include an image; A partial reflection mirror that reflects part of the light and transmits the remaining light, a first eyepiece that forms the image light transmitted from the partial reflection mirror in the right eye so as to enlarge an image, and reflects the image light reflected from the partial reflection mirror A total reflection mirror for changing a path in the direction of the left eye of the person, and a second eyepiece for changing the image light reflected by the total reflection mirror to the same size as the image light formed in the right eye and forming an image in the left eye It is characterized by.

Description

Single Head Mounted Display Units

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a single plate head mounted display device (HMD), and more particularly, to a single panel head mounted display device configured to separate an image output from one image display device and to be viewed with both eyes. will be.

Recently, the demand for personal display devices is increasing according to the trend of miniaturization of display elements, and the image output from the small image display element is enlarged by using an optical system, and the virtual image is visually observed, thereby allowing a large screen at a constant distance. A display device that has the same effect as viewing an image with the above has been developed. Such devices are called single-head head mounted display devices (hereinafter referred to as HMDs) because they are mostly mounted on the head or worn in the same way as glasses.

1 is a view showing the configuration of a single-head head mounted display device according to the prior art.

Referring to FIG. 1, a liquid crystal (LCD) panel 101 displaying an image, and a backlight 102 disposed at a rear of the liquid crystal panel 101 to emit light to the liquid crystal panel 101. And a half mirror 103 which passes through the liquid crystal panel 101 to reflect a part of light including an image and passes the rest to a left eye of the person, and A total reflection mirror 104 which reflects the light passing through the half mirror 103 to change the path to the right eye of the person, and an image which changes the light reflected by the half mirror 103 into parallel light and forms an image in the left eye. A first eyepiece 105, a second eyepiece 106 for converting the light reflected from the total reflection mirror 103 into parallel light and forming an image in the right eye, the half mirror 103 and the total reflection mirror 104; It is disposed between the optical path length adjusting lens 107.

Since the path lengths from the liquid crystal panel 101 to the eyepieces 105 and 106 are different from each other, the optical path length adjusting lens 107 is disposed on a long optical path, thereby reducing the optical path length. 101) to make the image displayed in the user's left and right eyes the same size.

The single-head type head mounted display device of the related art having the above configuration operates to separate light including an image from the half mirror 103 while passing through the liquid crystal panel 101 and to form an image on the left and right eyes. Since the optical path length adjusting lens 107 is used to view an image of the same size, there is a problem in that a complex optical system is configured together with two eyepieces.

In addition, since the half mirror 103 has the same amount of reflection and the amount of transmission, the light entering the left and right eyes has a different brightness due to the difference in path lengths, and thus a problem in that it is impossible to provide a good image to the user.

The present invention has been made to solve the above problems, the object of which is to simplify the configuration by forming the image of the same size in the left and right eyes by changing the shape of the left and right eyepieces without using the optical path length adjustment lens. The present invention provides a single head mounted display device.

In addition, another object of the present invention is to provide a single-head head-mounted display device that can make the brightness of the image incident on the left and right eyes equal by using a partial reflection mirror that can adjust the ratio of reflection and transmission without using a half mirror. To provide.

1 is a view showing the configuration of a single-head head-mounted display device according to the prior art,

2 is a view showing the configuration of a single-head type head mounted display device according to the present invention;

3 is a view showing the shape of the eyepiece according to the present invention,

4 illustrates the operation of the present invention.

<Description of Symbols for Main Parts of Drawings>

210: LCD panel 220: Backlight

230: partially reflective mirror 240: first eyepiece

250: total reflection mirror 260: second eyepiece

According to a feature of the present invention for achieving the above object, a liquid crystal (LCD) panel for displaying an image, a backlight disposed in the rear of the liquid crystal panel to emit white light to the liquid crystal panel, and A partial reflection mirror that reflects a portion of the light including the image through the liquid crystal panel and transmits the rest, and a first eyepiece that forms the image light transmitted through the partial reflection mirror in the right eye so as to be an enlarged image. A lens, a total reflection mirror that changes the path in the direction of the left eye of the person by reflecting the image light reflected by the partial reflection mirror again, and the image light reflected by the total reflection mirror is the same size as the image light formed in the right eye The present invention provides a single-head type head mounted display device including a second eyepiece configured to form a left eye by changing to.

In this case, in the partial reflection mirror, reflectance and transmittance are adjusted so that a greater amount of light travels toward the longer light path according to the light path length to each eyepiece in order to equalize the amount of light incident to the left and right eyes.

In addition, the first eyepiece is formed to have a shorter focal length than the focal length, and the second eyepiece is formed to be longer than the focal length, but the first eyepiece and the second eyepiece are It is formed to have the same focal length.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the single-head display device according to the present invention will be described in detail.

2 is a diagram showing the configuration of an embodiment according to the present invention.

Referring to FIG. 2, reference numeral 210 denotes a liquid crystal (LCD) panel displaying an image, and reference numeral 220 is disposed behind the liquid crystal panel 210 to emit light to the liquid crystal panel 210. (Backlight), reference numeral 230 denotes a partial reflection mirror that passes through the liquid crystal panel 210 and partially reflects and transmits the rest according to a ratio set in the light including the image, and reference numeral 240 denotes the partial reflection A first eyepiece for imaging the image light transmitted from the mirror 230 to the right eye to form an enlarged image, reference numeral 250 denotes the image light reflected from the partial reflection mirror 230 to reflect back the image light The total reflection mirror changes the path in the direction of, and reference numeral 260 changes the image light reflected by the total reflection mirror 250 to the same size as the image light formed on the right eye. It shows a second eyepiece for imaging the cheuknun.

Since the path length reaching the first eyepiece 240 from the liquid crystal panel 210 is shorter than the path length reaching the second eyepiece 260, the path length should be as follows.

First, the first eyepiece 240 has a form in which the back focal length bf is shorter than the focal length f as shown in FIG. In this form, when the object is located within the focal length f, the viewer sees the enlarged virtual image.

In this case, the focal length f is a refraction at the end surface of the lens and the extension line of the ray incident in parallel from the place where the light ray a parallel to the optical axis is refracted through the lens and gathers at the optical axis in the vicinity of the optical axis. "O"; It refers to the distance on the optical axis to the point (p) where it meets the extension line of the light beam toward the point. Also, the post focal length bf means "; o" from the point where the last surface of the lens meets the optical axis; The distance to the point.

On the other hand, the second eyepiece 260 is composed of a combination of a pair of convex lens 261 and a concave lens 262, as shown in Figure 3 (B), than the focal length f ' The post focal length bf 'has a longer shape. In this case, in order to make an enlarged virtual image having the same size as the first eyepiece 240, the first eyepiece 240 has a focal length f ′ equal to the focal length f of the first eyepiece 240.

The pair of convex lenses 261 disposed on the liquid crystal panel 210 side of the second eyepiece 260 have positive refractive power, and the concave lens 262 disposed on the left eye side has negative refractive power. do.

On the other hand, the partial reflection mirror 230 has a longer optical path according to the optical path length to each eyepiece 240,260, ie, toward the second eyepiece 260 to equalize the amount of light incident to the left and right eyes. The reflectance and transmittance are adjusted so that the amount of light proceeds.

In the single-head type head mounted display device of the present invention having the above-described configuration, the image light passing through the liquid crystal panel 210 is separated by the partial reflection mirror 230, and shown in FIGS. 4A and 4B. As shown, the image light traveling to the right eye, that is, the short side of the optical path passes through the first eyepiece 240, and is imaged to a predetermined size. The image is passed through the lens 260 to the same size as the image formed on the right eye.

As described above, the single-head type head mounted display device of the present invention has a simple effect of forming an image of the same size in the left and right eyes by changing the shape of the left and right eyepieces without using the optical path length adjusting lens. have.

In addition, since the ratio of reflection and transmission is adjusted by using a partial reflection mirror, the brightness of an image incident on the left and right eyes is equally adjusted.

Claims (3)

A liquid crystal (LCD) panel for displaying an image, a backlight disposed behind the liquid crystal panel to emit white light to the liquid crystal panel, and a ratio of light passing through the liquid crystal panel to include an image; A first reflection lens formed of a partial reflection mirror that partially reflects and the other is transmitted, a first eyepiece formed of a convex lens that forms image light transmitted from the partial reflection mirror in the right eye so as to enlarge an image, and an image reflected by the partial reflection mirror A total reflection mirror for changing the path in the direction of the left eye of the person by reflecting light again; a pair of convex lenses for refraction of the light reflected from the total reflection mirror and transmitting the total reflection mirror; and image light reflected from the total reflection mirror Consists of a concave lens that transmits to the left side, and changes to the same size as the image light formed on the right eye. And a second eyepiece for damaging. The method of claim 1, The partial reflection mirror is a single-head head mounted type, characterized in that the reflectance and the transmittance is adjusted so that the greater the light path toward the longer light path according to the light path length to each eyepiece to equalize the amount of light incident to the left and right eyes Display device. The method of claim 1, The first eyepiece is formed to have a shorter focal length than the focal length, and the second eyepiece is formed to be longer than the focal length, but the first eyepiece and the second eyepiece are the same focal length. Single-head display device, characterized in that formed to have a distance.