KR19990048195A - HMD for 3-D Imaging - Google Patents

Abstract

The present invention allows a three-dimensional stereoscopic image to be viewed by expanding a left and right stereoscopic optical image that is changed to a user's field of view after image display and condensing the left and right signals by color light filtering in the device and condensing them to the left and right field of view of the user. A HMD for a three-dimensional image, comprising: a single light source 1 which is a backlight; A first polarization filter (2) for filtering a polarization component inclined at 45 ° to a space of a plane of the drawing among light incident from the light source (1); forming an optical image as in the prior art by using the polarization component A single liquid crystal display (3); a second polarization filter (2 ') for filtering incident light by the same polarization axis as the first polarization filter (2); A prism 10 having two orthogonal reflecting surfaces, each reflecting surface having a dielectric coating so that the reflected polarization components are different; Color reflection mirrors 40a and 40b for red and blue filters to selectively change the red and blue visible light bands among the optical signals reflected by the prism 10 so as to change their paths; And two eyepiece lenses 5 for condensing each light component of the changed path to form an enlarged virtual image, so that a user can watch a three-dimensional stereoscopic image without wearing a separate device for right and left separation. As a result, viewing of a stereoscopic image is convenient, and it can be selectively adapted to two-dimensional and three-dimensional images, thereby increasing the usefulness of the device.

Description

HMD for 3D Video

The present invention relates to an optical system of a head mounted display device (HMD) for a three-dimensional image that allows viewing of a three-dimensional stereoscopic image without wearing a separate device, and more particularly, a path is changed to the user's field of view after the image is displayed. The present invention relates to an HMD for a three-dimensional (3D) image that allows an enlarged three-dimensional (3D) image to be viewed by selectively separating left and right signals from the left and right by a color light filter in a device and condensing the left and right signals to a left and right field of view.

The Head Mounted Display (HMD), which is causing a new wind in the electronics industry these days, uses optical elements such as liquid crystal displays (LCDs) and polarizing filters to control image signals through lenses and mirrors. By expanding and condensing, the principle is very simple, and the optical system used therein is suitably variably arranged so that various functions can be realized.

In the conventional HMD, as shown in FIG. 1, the polarization axis rotation of light components emitted from the back light 1 and the first polarization filter 2 that emit light with respect to a single eye is shown. A liquid crystal display 3 for controlling whether or not to be controlled according to an input image signal, a second polarization filter 2 'that filters only polarization components in a specified direction among the output light of the liquid crystal display 3, and the second polarization filter ( 2 '), a total reflection mirror 4 for changing the path by totally reflecting the image displayed output light, and an eyepiece lens 5 for condensing the totally reflected light image. Another identical configuration was provided to construct an HMD for both eyes.

In the conventional HMD configured as described above, the light emitted from the light source 1 passes through the first polarization filter 2 so that only the polarization component in the polarization filter direction is output, and the output single polarized light is emitted. In the liquid crystal display 3, the polarization axis is passed through without rotation or rotation by a cell voltage applied or blocked according to the video signal to be displayed.

As described above, the light component in which the polarization direction is controlled and output according to whether the power is applied to each cell of the liquid crystal display 3 is output by the second polarization filter 2 '. However, optical components that are perpendicular to each other are not output so that an optical image corresponding to the applied image signal is formed.

The optical image formed as described above is totally reflected by the user's eye through the total reflection mirror 4 and is incident on the eyepiece lens 5, and the light components incident on the eyepiece lens 5 are focused on both eyes of the user. As a result, the image is recognized by the user as an enlarged virtual image.

However, the HMD configured and operated as described above has the same configuration for both eyes, in particular, an expensive LCD, so that the price of the device increases and the product competitiveness is lowered. There has been a problem, and in order to solve this problem, a simple structure HMD such as FIG. 2 using a single LCD has been proposed and filed by the present applicant as the same.

The HMD of the single LCD of FIG. 2 is a single light source 1 that is a backlight and a first polarization filter that filters a polarization component inclined at 45 ° to a space with respect to a plane on the drawing of light incident from the light source 1 ( 2) a single liquid crystal display 3 using the polarization component to form an optical image as in the prior art, and a second polarization filter 2 'for filtering incident light by the same polarization axis as the first polarization filter 2. The prism 10 has two orthogonal reflecting surfaces, and each reflecting surface is coated with a dielectric coating so that the reflected polarization components are different, and each polarization component separated and reflected by the prism 10 is viewed by the user. Two total reflection mirrors 4 for rerouting, and two eyepiece lenses 5 for condensing each of the rerouted light components to form an enlarged virtual image.

In the HMD of the single LCD configured as described above, the polarization axis of the image-displayed optical image passing through the liquid crystal display 3 and the second polarization filter 2 'is virtual by the incident and reflected light in the prism 10. It is inclined at 45 ° with respect to the plane and incident on each reflecting surface of the prism 10, and is separated by the S-wave and P-wave, which are two polarization components perpendicular to and parallel to the virtual plane, respectively, thereby changing paths and condensing thereafter. An enlarged virtual image is formed.

However, the HMD configured as described above to form an image also does not have a configuration for providing a stereoscopic image, as in the conventional HMD of FIG. 1, when the provided image is a stereoscopic image, the user may separate the image into left and right signals. The user should wear glasses with color cellophane or color lenses separately, thereby making the user's eyes harder to watch for a long time by doubling the frustration and discomfort of wearing. In addition, it was impossible to wear a separate color filter glasses for viewing three-dimensional stereoscopic images.

Therefore, the present invention was created to solve the above problems, and provides an HMD for a three-dimensional image with a built-in left and right video signal separation function so that three-dimensional stereoscopic image can be viewed without wearing a separate device for left and right separation. Its purpose is to.

1 illustrates a configuration of a single eye among the configurations of a conventional HMD,

2 is a configuration diagram of an HMD using a single liquid crystal display,

3 to 5 are configuration diagrams of a preferred embodiment of the HMD for the three-dimensional image according to the present invention.

* Explanation of symbols for main parts of the drawings

1: Back-light 2, 2 ': polarization filter

3: Liquid Cristal Display 4: Total Reflection Mirror

5: Eye-piece Lens 6a: Red Light Filter

6b: blue light filter 10: prism

40: color reflection mirror 40a: color reflection mirror for red filter

40b: color reflection mirror for blue filter

HMD for the three-dimensional image according to the present invention for achieving the above object, in the head-mounted display device (HMD), with respect to the incident polarization component, two orthogonally polarized light components constituting the polarization component A first polarization formed such that a polarization axis for polarizing and filtering the emitted light is inclined at a predetermined angle with respect to an imaginary plane formed as a prism for separating and reflecting light, an illumination means for emitting light, and an incident path of the emitted light and a reflection path by the prism Filtering means, image display means for rubbing at the same inclination angle and the predetermined angle, selectively rotating the polarization axis of the polarized light in accordance with the applied image signal by 90 °, transmitted through the light component of a specific polarization axis of the transmitted light of the image display means Second polarized light filtering means for incident on the prism, each of the light components separated and reflected by the prism Only the positive color bands different from each other to select two color reflection means for changing respective paths, and is characterized by being configured to include the two eyepieces for respectively condensing the light component wherein the path is changed.

In the HMD for the three-dimensional image configured as described above, light emitted from a single illumination means passes through the first polarization filtering means, thereby forming an incident path of the emitted light and a path of light reflected by the prism thereafter. Only the light component of the polarization axis inclined by a predetermined angle with respect to the imaginary plane is filtered, and the image display means for receiving the polarization of the light component to be filtered selectively rotates the polarization axis by 90 ° depending on whether the cell is powered. Will pass. After passing through the second polarization filtering means selectively according to whether the polarization axis is rotated, the light component having passed through the image display means is incident on the prism, and the reflecting surface of the prism is configured to reflect the incident polarization component. The polarized light component orthogonal to the virtual plane and the polarized light component included in the virtual plane are separately reflected, and the separated and reflected light components are applied to respective color reflecting means, and thus different from each other by the respective color reflecting means. Only optical signals in the selected left and right specific color bands are respectively reflected and rerouted, and then focused by the two eyepieces, thereby allowing the user to watch the left and right separated images.

Hereinafter, the configuration and operation of the preferred embodiment of the HMD for the three-dimensional image according to the present invention will be described in detail with reference to the accompanying drawings.

3 and 4 are schematic diagrams of a preferred embodiment of the HMD for the three-dimensional image according to the present invention. The configuration of FIG. 3 is a red and blue visible light band instead of the total reflection mirror 4 in the HMD configuration of FIG. 2. It comprises a color reflecting mirror (40a, 40b) for the red and blue filter coated to reflect, the configuration of Figure 4 in the HMD configuration of Figure 2, red and blue in the optical image routed by the total reflection mirror (4) Red and blue light filters 6a and 6b for transmitting only visible light in the band are further included.

In the HMD for the three-dimensional image according to the present invention configured as shown in FIG. 3, first, light emitted from the light source 1 becomes a light component of a single polarized light inclined by 45 ° by the first polarization filter 2. Afterwards, the left and right image signals of the liquid crystal display 3 become optical images synthesized by color bands, and are polarized by the second polarization filter 2 ′, which is then reflected on two reflective surfaces on the prism 10. As a result, the light is reflected by dividing into P and S waves, respectively.

The light components of the P wave and the S wave which are separated from each reflecting surface through the prism 10 are separated from each other by SiO and MgF ₂ having different stacking and thicknesses so that the red and blue bands in the visible light are selected and reflected. Two color reflecting mirrors 40a and 40b having a dielectric coating film are respectively incident. The S-wave light component incident on the red filter color reflection mirror 40a reflects only the red band recorded as the left signal of the incident light, and the blue filter color reflection mirror 40b is the incident P wave. Among the light components, only the blue band recorded as the right signal is reflected, separated into left and right signals, and the path is changed to the user's eyes, and then focused by the eyepiece lens 5 at each focal point, thereby being 10 times within the user's field of view. The enlarged three-dimensional stereoscopic image is formed.

In another embodiment of the HMD for the 3D image according to the present invention configured as shown in FIG. 4, the left and right composite signals are separated into P waves and S waves by the prism 10 as in the embodiment of FIG. 3. After the path is changed by the total reflection mirror 4, the red left image and the blue right image are selectively extracted by the red and blue light filters 6a and 6b, respectively, and condensed by the eyepiece lens 5, respectively. Allows the user to visually recognize three-dimensional stereoscopic images.

On the other hand, the color light filter (6a, 6b) is provided to be detachable by the user, if the provided image is not a three-dimensional image to remove and view the image, if the provided image is a three-dimensional image, the corresponding position It is possible to increase the usefulness of the device by installing it in a 3D image.

5 is a configuration diagram of another embodiment of the HMD for the three-dimensional image according to the present invention, in the configuration of the conventional HMD optical system of FIG. 1, color reflection reflecting a red (or blue) band instead of the total reflection mirror 4 It is configured to include a mirror 40, the configuration for the other single view (not shown) is provided with a color reflecting mirror 40 reflecting a color band different from the reflected band, that is, a blue (or red) band In the same manner as in the above-described process, the left and right signals distinguished by the color band are divided to provide a 3D stereoscopic image to the user.

HMD for the three-dimensional image according to the present invention configured and operated as described above, by allowing the user to watch the three-dimensional stereoscopic image without wearing a separate device for left and right separation, viewing of the stereoscopic image is more convenient, It can be selectively adapted to two-dimensional and three-dimensional images, thereby increasing the usefulness of the device.

Claims (6)

In the head mounted display device (HMD), with respect to the incident polarization component, the split reflection key comprises two prismatic polarized light components constituting the polarization component, a prism, an illumination means for emitting light, and an incident path of the emission light. And a first polarization filtering means formed so that a polarization axis for polarizing the radiation light is inclined at a predetermined angle with respect to an imaginary plane formed as a reflection path by the prism, and the image image signal being rubbed at the same inclination angle as the predetermined angle and applied. According to the image display means for selectively rotating the polarization axis of the polarized light by 90 °, the second polarization filter means for transmitting the light component of a specific polarization axis of the transmitted light of the image display means to enter the prism, separated by the prism Of each of the reflected light components, only two specific color bands are selected differently from each other, thereby rerouting HMD for a three-dimensional image comprising a color reflecting means, and two eyepieces for condensing the rerouted light components, respectively. The HMD of claim 1, wherein the differently selected color bands are red and blue visible light bands. The method of claim 1, wherein the two color reflecting means have a dielectric coating film of SiO and MgF ₂ with different lamination and thickness so that color bands in visible light are selected and reflected differently from each other. HMD for dimensional imaging. In the head mounted display device (HMD), a prism for separately reflecting the incident polarization component into two orthogonally polarized light components constituting the polarization component, illumination means for emitting light, and the incident path of the emission light and A first polarization filtering means formed such that a polarization axis for polarizing the radiation light is inclined at a predetermined angle with respect to a virtual plane formed as a reflection path by the prism, and is rubbed at the same inclination angle as the predetermined angle and applied according to an applied image signal Image display means for selectively rotating the polarization axis of the polarized light by 90 °, second polarization filter means for transmitting an optical component of a specific polarization axis among the transmitted light of the image display means to be incident on the prism, and separately reflected by the prism Two total reflection means for rerouting each light component, a particular color of the rerouted light component HMD for a three-dimensional image comprising two color band filtering means for selecting and transmitting only the band differently from each other, and two eyepieces for condensing light of the transmitted color band, respectively. 5. The HMD of claim 4, wherein the color band filtering means is detachably provided. In the head mounted display device (HMD), two light sources emitting light, two first polarization filtering means for polarizing the emitted light components, and a polarization axis of the polarized light in accordance with an applied image signal. Two image display means for selectively rotating 90 [deg.], Two second polarization filter means for transmitting light components of a specific polarization axis among transmitted light of the image display means, and only a specific color band among the polarized light components is different from each other HMD for a three-dimensional image comprising a first and second color reflecting means for selecting and respectively rerouting, and two eyepieces for condensing the rerouted light components, respectively.