WO2016159399A1

WO2016159399A1 - Virtual reality display device

Info

Publication number: WO2016159399A1
Application number: PCT/KR2015/003087
Authority: WO
Inventors: 강창만
Original assignee: 강창만
Priority date: 2015-03-30
Filing date: 2015-03-30
Publication date: 2016-10-06

Abstract

An embodiment of the present invention relates to a virtual reality display device. A solution for a technical objective is to complexly display a sense of depth distance and a sense of spatial distance by means of depth and a stereoscopic image from 2D video and 3D video data when displaying on a device a display structure comprising a multi-layer image and a stereoscopic image and, moreover, to prevent moiré effects. To this end, disclosed is a virtual reality display device comprising: a first screen which is for displaying a first image; a second screen which is disposed away from the first screen and is for displaying a second image comprising a left-eye image and a right-eye image; a polarization retardation plate which is adhered on one side of the second screen facing the first screen and is for adjusting the linear polarization angle of the first screen and second screen; and a diffusion plate which is adhered on one side of the first screen facing the second screen and is for diffusing the first image.

Description

Virtual reality display device

One embodiment of the present invention relates to a virtual reality display device.

Recently, three-dimensional image processing technology has been used in a variety of fields, such as education, training, medicine, film, computer games. The 3D image is more efficient than the 2D image to feel presence, real feeling, and natural feeling.

Such a 3D image display device requires various technologies such as input technology, processing technology, transmission technology, display technology, software technology, and the like, and especially for a human visual system such as display technology, digital image processing technology, computer graphics technology, and the like. Research is essential.

On the other hand, the most well-known method of the display method of the three-dimensional image display device is the integral photography method, which records three-dimensional images formed by a microlens array shaped like a fly's eye. And transmission and reproduction.

That is, as shown in Fig. 1, the three-dimensional image display apparatus according to the prior art arranges a microlensarray 1 having the fly-eye microlenses 2, and the microlens array 1 Place an aspect carrier 3 with individual pixels 4 at regular intervals from.

Then, when two-dimensional projection images are emitted from the projection image carrier 3 near the focal plane of the microlens array 1, the two-dimensional projection images are synthesized while passing through the microlenses 2 of the microlens array 1. The three-dimensional image 5 is displayed.

However, the above-described integral photography method has a problem in that image quality deterioration of a 3D image due to a moire˘ effect occurs. Here, the moiré effect is a phenomenon in which periodic patterns cause wave patterns while interfering with each other.

In order to solve this problem, there have been attempts to place a diffuser between two liquid crystal display panels, but such a diffuser plate has an advantage of preventing the moire effect due to the overlap of two pixels, The haze characteristic of the display not only causes the loss of the clarity and brightness from 20% to 30%, but also the loss rate of the transparent display, which is proportionally reduced, which is not efficient and the implementation rate of the color also changes considerably. .

According to an embodiment of the present invention, a display structure including a multilayer image and a stereoscopic image, and a space of depth and an image space from a 2D video and a 3D video data to a depth and a stereoscopic image when displayed on a device Provided is a virtual reality display device that can display a sense of separation in combination and further suppress the occurrence of moiré phenomenon.

In addition, an embodiment of the present invention provides a virtual reality display device that selectively combines multiple screens that are transparent, maintain a certain distance and overlap.

In addition, an embodiment of the present invention uses an autostereoscopic 3D image method while selectively using a normal compression algorithm, a 3D image of a binocular disparity method, and a 3D image algorithm of an N parallax method to display images individually on a superimposed display. By selectively implementing and displaying a common algorithm on a multi-layer screen for higher image combination, the viewing environment can be distributed to the display environment during the occurrence of congestion phenomenon of autostereoscopic image method (during dizziness). Provided is a virtual reality display device capable of avoiding congestion.

According to an embodiment of the present invention, a virtual reality display device includes a first screen displaying a first image; A second screen disposed to be spaced apart from the first screen to display a second image including a left eye image and a right eye image; A polarization retardation plate attached to one surface of a second screen facing the first screen to adjust a linear polarization angle of the first screen and the second screen; And a diffusion plate attached to one surface of the first screen facing the second screen to diffuse the first image.

The second screen may be disposed in close contact with each other without being spaced apart from the first screen.

The first screen may be a thin film transistor-liquid crystal display (TFT-LCD).

A slit member attached to the other surface opposite to one surface of the second screen and formed in an oblique shape to emit the left eye image and the right eye image to the left and right eyes of the user located in front of the other surface of the second screen. It may include.

The slit member may be arranged such that the first unit slit facing the left eye of the user and the second unit slit facing the right eye are alternated with each other.

The slit member may include a plurality of unit slits, and the unit slit may include a first unit slit facing the user's left eye and a second unit slit disposed alternately with the first unit slit facing the user's right eye. Can be.

The slit member may include a plurality of unit slits, and the unit slits may have an inclination angle of 5 degrees to 85 degrees with respect to a reference plane, and the reference plane may be defined as a ground on which the user is located.

The slit member may include a plurality of unit slits, and the unit slits may have an embossed shape convex in the second screen direction.

The virtual reality display device according to an embodiment of the present invention can not only prevent a moire effect, but also improve clarity and brightness.

In addition, one embodiment of the present invention can make the implementation of colors more realistic and clear.

1 is a view showing a three-dimensional image display apparatus according to the prior art.

2 is a diagram illustrating a virtual reality display device according to an embodiment of the present invention.

3 is an exploded perspective view of the virtual reality display device of FIG. 2.

4 and 5 are diagrams illustrating a use state of the virtual reality display device of FIG. 2.

Terms used herein will be briefly described and the present invention will be described in detail.

The terms used in the present invention have been selected as widely used general terms as possible in consideration of the functions in the present invention, but this may vary according to the intention or precedent of the person skilled in the art, the emergence of new technologies and the like. In addition, in certain cases, there is also a term arbitrarily selected by the applicant, in which case the meaning will be described in detail in the description of the invention. Therefore, the terms used in the present invention should be defined based on the meanings of the terms and the contents throughout the present invention, rather than the names of the simple terms.

When any part of the specification is to "include" any component, this means that it may further include other components, except to exclude other components unless otherwise stated.

DETAILED DESCRIPTION Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art may easily implement the present invention. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. In the drawings, parts irrelevant to the description are omitted in order to clearly describe the present invention, and like reference numerals designate like parts throughout the specification.

2 is a diagram illustrating a virtual reality display device according to an embodiment of the present invention, FIG. 3 is an exploded perspective view of the virtual reality display device of FIG. 2, and FIGS. 4 and 5 are a state of use of the virtual reality display device of FIG. 2. It is a figure which shows.

2 to 3, the virtual reality display device 100 according to an embodiment of the present invention displays various information and / or images through two overlapping first screens 102 and second screens 104. The device may include a first screen 102, a second screen 104, a polarization retardation plate 106, a diffusion plate 110, and a slit member 108. That is, the virtual reality display device 100 according to an embodiment of the present invention is between the first screen 102 and the second screen 104, and faces of the first screen 102 and the second screen 104 facing each other. A diffusion plate 110 and a polarization retardation plate 106 attached on each side thereof, and a slit member 108 attached to the front of the second screen 104. In this case, the first screen 102 and the second screen 104 at least partially overlap.

The first screen 102 and the second screen 104 are arranged to selectively overlap, and one or more screens are arranged horizontally and checkered on one side of the transparent display.

The first screen 102 is a thin film transistor-liquid crystal display (TFT-LCD) that displays a first image, and may display a two-dimensional image. Hereinafter, the first screen 102 will be collectively described as being a TFT-LCD.

The second screen 104 is a panel that is positioned at a predetermined distance from the TFT-LCD 102 to display a second image including a left eye image and a right eye image, and may be implemented as various color LCD liquid crystals. In this case, the second screen 104 may be spaced apart from the first screen 102 by about 2 cm to 4 cm, but may be spaced at intervals of 3 cm. The second screen 104 may alternately display the left eye image and the right eye image. In addition, the second screen 104 may display a two-dimensional image or a three-dimensional image according to whether the light emitted from the front and rear or side is divided into a left eye or a right eye. Accordingly, the multi-layered autostereoscopic 3D display device 100 is arranged so that the first screen 102 and the second screen 104 are separated by a predetermined distance, thereby physically overlapping the first image and the second image. The 3D image effect may be implemented, and thus, a congestion phenomenon felt by the user may be prevented.

Optionally, the second screen 104 may be disposed to be in close contact with each other without being spaced apart from the first screen 102. Accordingly, the polarization retardation plate 106 attached to the second screen 104 may be formed almost integrally with the diffusion plate 110 attached to the first screen 102. In addition, an antireflection film (not shown) may be disposed between the polarization retardation plate 106 and the diffusion plate 110 that are in close contact with each other.

In this case, the second screen 104 and the first screen 102 are in close contact with each other, and the moiré effect due to color interference that may occur due to the distance between the second screen 104 and the first screen 102. Can be significantly reduced.

On the other hand, LCD liquid crystal is a device that displays by using the property of liquid crystal that changes the arrangement of molecules when voltage is applied, and arranges by injecting liquid crystal into the narrow gap between two glass plates and applying electric pressure through transparent electrodes to each liquid crystal molecule. By changing the arrangement of the device using the optical refraction changes that occur at this time as a device for displaying a character or an image, a detailed description thereof will be omitted.

In addition, the TFT-LCD 102 and the second screen 104 are data or data formats for visually representing characters, symbols, plain text, images, still and moving animations, still and moving video images, and combinations and information thereof. It includes.

The TFT-LCD 102 and the second screen 104 place closed polarization filters on the front and back of each liquid crystal active element. As a result of this characteristic operation of the liquid crystal display, the planar polarization of the light coming from the front of the second screen 104 intersects with respect to the polarization plane of the back of the TFT-LCD 102. In the present invention, polarization is performed between the TFT-LCD 102 and the second screen 104 to rotate the light from the second screen 104 to the required angle to align with the rear polarizing filter of the TFT-LCD 102. Install the delay plate.

The polarization retardation plate 106 causes a phase angle variation or delay less than or equal to the incident light wavelength. In addition, the polarization retardation plate 106 does not produce a vivid color interference fringe when used in the multilayer stereoscopic image display apparatus 110.

The polarization retardation plate 106 has had disadvantages such as unstable exposure to bright light and / or discoloration, manufacturing cost, and brittleness over time, but in the present invention, in order to compensate for such disadvantages, the optical properties of the biaxial polypropylene It consists of a material with properties. Here, the biaxial polypropylene may be made of a transparent and flexible film, but the present invention does not limit the type of biaxial polypropylene, but may be made of a lacquer or a coating.

Theoretically, the polarization retardation plate 106 can be placed anywhere between the TFT-LCD 102 and the second screen 104, but the polarization retardation plate 106 of a technology such as polyester allows the second screen ( It is preferable to install on the back of 104). This is to avoid the interference that the diffusion pattern to be applied to the polarization retardation plate 106 deteriorates the image of the multilayer stereoscopic image display apparatus 100. Here, the interference pattern is generated due to the moire effect, which is the interference due to the minute temporal mismatch between the structural surfaces of the TFT-LCD 102 and the second screen 104, and the effect that the white polarization is separated into the rainbow color.

In the present invention, the spread of light is used to eliminate the interference pattern generated between the TFT-LCD 102 and the second screen 104.

In addition, a diffusion plate 110 is provided in front of the TFT-LCD 102. Here, the diffusion plate 110 diffuses the image displayed on the TFT-LCD 102.

The slit member 108 is composed of a layer separate from the polarization retardation plate 106, and is formed in a pattern having a shape of embossing of a constant length in diagonal lines or of a shape of a check and a line. The slit member 108 may distinguish the pixels visible to the left eye and the right eye differently, and apply an image to be received differently, thereby making it possible to feel a three-dimensional effect by binocular disparity without wearing glasses.

The slit member 108 is preferably installed on the front of the second screen 104, and is made in the form of embossing of a constant length diagonally. Here, the slit member 108 may include a slit classification method including a parallax barrier method, a lenticular method, or a tracking time division method to optically distinguish the left image from the right image on the second screen 104 that is selectively overlapped. Can be distinguished by.

More specifically, the slit member 108 includes a plurality of unit slits. In this case, the unit slits are arranged such that the unit slits facing the left eye of the user and the unit slits facing the right eye are alternated with each other.

The unit slit may include a first unit slit facing the user's left eye and a second unit slit facing the user's right eye and alternating with the first unit slit. That is, the unit slits may include first unit slits, second unit slits, and n-th unit slits that are alternated with each other.

The unit slit is formed diagonally so as to have an inclination angle θ of 5 degrees to 85 degrees with respect to the reference plane. In this case, when the unit slit has an inclination angle θ of 5 degrees or less with respect to the reference plane, or has an inclination angle θ of 85 degrees or more with respect to the reference plane, the unit slit is closer to a vertical or horizontal shape than a diagonal line. There is a problem that it is difficult to secure the viewing angle as shown.

On the other hand, the reference plane may be defined as the ground on which the user is located.

In addition, the unit slit is formed to have an embossed shape that is convex forward in the direction of the second screen 104.

The material of the slit member 108 may be in the form of acrylic, glass, LCD, optical retardation plate, or film, each of which may be composed of a single and a compound in a uniform form.

In addition, the slit member 108 is adhered to the front of the second screen 104, the adhesive method to determine a predetermined thickness and form a gap physically, the front surface or a plurality of partial surfaces of the UV liquid curing method, It can be bonded by an adhesive method through an adhesive that has a predetermined thickness such as a slope.

Here, the slit member 108 includes a left eye L on a flat panel display in which red, green, and blue subpixels are alternately arranged in a row direction so as to display content divided into binocular parallax and N parallax. And a stereoscopic image such as a right eye R or an N eye, and are physically attached to the flat panel display. In this way, the slit member 108 is a physical optically configured filter that allows only the right eye image in the right eye and the left eye image in the left eye, so that the viewer's eyes can display different images so that a 3D feeling can be felt.

Accordingly, as shown in FIGS. 4 to 5, the virtual reality display apparatus 100 applies an image of differently accepting pixels that are visible to the left eye and the right eye, so that binocular disparity is achieved without wearing glasses. The display may be displayed in front of the second screen 104 to feel a three-dimensional effect.

In the virtual reality display device 100 configured as described above, when visible light having an average wavelength of 560 nm is used, the phase difference of the polarization retardation plate 106 is less than or equal to 560 nm. Accordingly, according to the present invention, the polarization retardation plate 106 produces a phase angle delay that is less than or equal to one wavelength of light incident on the multilayer stereoscopic image display apparatus 110. This is also referred to as a linear displacement less than or equal to 560 nm of incident light.

Meanwhile, the virtual reality display apparatus 100 according to the present invention may further include a third screen (not shown).

The third screen is located behind the TFT-LCD 102 and at least a portion of it overlaps the TFT-LCD 102 and the second screen 14, producing a stereoscopic image display and a normal (2D) image display.

On the other hand, the divergence of the light source can optionally be obtained from the polarization source for the display of the first image in the TFT-LCD 102, and additionally a light source (not shown) between the TFT-LCD 102 and the second screen 104 is shown. Omit).

Accordingly, the virtual reality display apparatus 100 according to the present invention includes all of the processing speed, color, repetition, visual effect, ruming, scrolling, blink fading, and improvement and change in size, and is selectively shaped by a superimposed screen. Including vertically constant plate, horizontally constant plate, obliquely constant plate, mosaic pattern, color difference classification, and time difference division method, the method up to N parallax including side by side parallax method can be generated through synthesis. It is also possible to selectively change the display of stereoscopic (3D) images from normal (2D) images.

Meanwhile, an edge member (not shown) made of a polypropylene resin composition may be provided at the edge portion of the second screen 104 to improve impact resistance and rigidity of the edge portion of the second screen 104.

The polypropylene resin composition is a polypropylene impact copolymer composition comprising a polypropylene homopolymer and an ethylene-propylene block copolymer. In this case, the polymers are resins mixed in the polymerization step.

The polypropylene homopolymer maintains the mechanical rigidity of the polypropylene resin composition while imparting an appropriate degree of heat resistance. The polypropylene homopolymer may be included in 70 to 95% by weight relative to the total weight of the polypropylene impact copolymer. If the content of the polypropylene homopolymer is less than 70% by weight, the stiffness of the final polypropylene resin composition is lowered to satisfy the required properties of the final product, and if the content of the polypropylene homopolymer exceeds 95% by weight, the content of the ethylene-propylene block copolymer is polymerized. This low difficulty in expressing the impact resistance characteristics.

The ethylene-propylene block copolymer is prepared by continuously polymerizing in a series of reactors after the production of polypropylene homopolymer, the ethylene-propylene block copolymer of the present invention serves to impart impact resistance to the polypropylene resin composition Do it.

The content of the ethylene-propylene block copolymer based on the total weight of the polypropylene impact copolymer may be 5 to 30% by weight. If the content of the ethylene-propylene block copolymer is less than 5% by weight, the impact resistance is not expressed, and if the content of the ethylene-propylene block copolymer is more than 30% by weight, the rigidity is lowered, thereby making it difficult to satisfy the final required characteristics of the product.

The ethylene content of the total weight of the ethylene-propylene block copolymer is 30 to 70% by weight, preferably 40 to 60% by weight. When the ethylene content in the copolymer is less than 30% by weight, the impact-resistant amorphous portion is reduced in the block copolymer to be polymerized, and the impact resistance is reduced. When the content is greater than 70% by weight, the crystalline polyethylene component is polymerized to be continuous. The compatibility with the phases may be reduced, thereby reducing the impact resistance characteristics due to interfacial peeling upon impact.

The ethylene-propylene block copolymer may have an intrinsic viscosity (Intrinsic Viscosity, dl / g) of 3 to 8dl / g. At this time, the intrinsic viscosity was measured using a viscosity meter for the ethylene-propylene block copolymer extracted in 135 ℃, decalin solution for 4g polypropylene impact copolymer. When the intrinsic viscosity is less than 3, the molecular weight of the polymerized ethylene-propylene block copolymer is low, which makes it difficult to absorb shock.

The polypropylene impact copolymer is characterized in that the weight average molecular weight (Mw) is 250,000 to 2,000,000. If the weight average molecular weight is less than 250,000, the molecular weight is low, the rigidity is lowered, there is a difficulty in absorbing shock, and if it exceeds 2000,000, it is difficult to polymerize in the reactor.

What has been described above is just one embodiment for implementing the virtual reality display device according to the present invention, and the present invention is not limited to the above embodiment, and as claimed in the following claims, the gist of the present invention Without departing from the scope of the present invention, any person having ordinary skill in the art will have the technical spirit of the present invention to the extent that various modifications can be made.

Claims

In the virtual reality display device,

A first screen displaying a first image;

A second screen disposed to be spaced apart from the first screen to display a second image including a left eye image and a right eye image;

A polarization retardation plate attached to one surface of a second screen facing the first screen to adjust a linear polarization angle of the first screen and the second screen; And

And a diffuser plate attached to one surface of the first screen facing the second screen to diffuse the first image.
The method according to claim 1,

And the second screen is arranged in close contact with each other without being spaced apart from the first screen.
The method according to claim 1,

And the first screen is a thin film transistor-liquid crystal display (TFT-LCD).
The method according to claim 1,

A slit member attached to the other surface opposite to one surface of the second screen and formed in an oblique shape to emit the left eye image and the right eye image to the left and right eyes of the user located in front of the other surface of the second screen. Virtual reality display device comprising a.
The method according to claim 4,

And the slit member is disposed such that a first unit slit facing the left eye of the user and a second unit slit facing the right eye are alternated with each other.
The method according to claim 4,

The slit member includes a plurality of unit slits, and the unit slit includes a first unit slit facing the user's left eye and a second unit slit disposed alternately with the first unit slit facing the user's right eye. Virtual reality display device, characterized in that.
The method according to claim 4,

The slit member includes a plurality of unit slits, wherein the unit slit has an inclination angle of 5 degrees to 85 degrees with respect to a reference plane, and the reference plane is defined as a ground on which the user is located.
The method according to claim 4,

The slit member includes a plurality of unit slits, wherein the unit slits have an embossed shape convex toward the second screen direction.