WO2019117320A1 - Three-dimensional display system and method using integrated image and holography - Google Patents

Abstract

Provided are three-dimensional display system and method using an integrated image and holography. An image display system, according to an embodiment of the present invention, comprises: an LC for scattering or transmitting incident light; a first SLM for representing image information; and a second SLM for reproducing a white image or a filter image, and thereby, the system may function as both an integrated image display and a holographic display through temporal multiplexing, and can generate/provide an optimized three-dimensional image selectively combining the advantages of the integrated image display and the holographic display.

Description

3D display system and method using integrated image and holography

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a 3D image technology, and more particularly, to a 3D display device and method using an integrated image and holography.

In the case of the integrated image display, which is one of the methods used to implement the existing three-dimensional display, the system configuration is easy and the quality of the image is high because the incoherent light source is used.

However, there is a disadvantage that the expressible depth range can only express a very limited area near the display surface.

On the other hand, in the case of a holographic display, the depth range for displaying an image is much wider than that of an integrated image display. On the other hand, the system configuration is complicated to use a coherent light source. Especially, There is a disadvantage in that it is deteriorated.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method for generating / providing an optimized three-dimensional image selectively combining advantages of an integrated image display and a holographic display, And a display system and method that can function both as an integrated image display and as a holographic display through multiplexing.

According to an aspect of the present invention, there is provided an image display system including: an LC (Liquid Crystal) which scatters or transmits incident light; A first SLM (Spatial Light Modulator) for representing image information; And a second SLM for reproducing a white image or a filter image.

In the integrated image display mode, the LC may scatter incident light, the first SLM may represent an integrated image, and the second SLM may be to reproduce a white image.

The integrated image may be displayed in a depth range from a front surface of the panel of the image display system to a specific distance forward.

The integrated image may be displayed in a depth range from the front of the panel of the image display system to a specific distance backward.

In the holographic display mode, the LC may transmit the incident light, the first SLM may represent the fringe image, and the second SLM may be to reproduce the filter image.

The holographic image may be displayed in a depth range exceeding a specific distance forward from the panel front side of the image display system.

The holographic image may be displayed in a depth range exceeding a specific distance from the front of the panel of the image display system backward.

The LC may be transferred to a diffuser state to scatter plane waves.

The second modulator may function as a spatial bandpass filter that generates an image represented by black except for the circular portion or the rectangular portion and transmits only the circular portion or the rectangular portion.

According to another embodiment of the present invention, there is provided a method of controlling an image display, comprising: LC (Liquid Crystal) scattering or transmitting incident light; A first SLM (Spatial Light Modulator) expressing image information; And the second SLM reproducing the white image or the filter image.

According to another embodiment of the present invention, an image display system includes an LC (Liquid Crystal) system for scattering or transmitting incident light; A first SLM (Spatial Light Modulator) for representing image information; A second SLM for reproducing a white image or a filter image; A first lens array disposed between the first SLM and the second SLM for transmitting a beam having passed through the LC and the first SLM to the second SLM; And a second lens array positioned in front of the second SLM to cause the image to be projected onto a virtual image plane.

According to another aspect of the present invention, there is provided a method of displaying an image, comprising: LC (Liquid Crystal) scattering or transmitting incident light; A first SLM (Spatial Light Modulator) expressing image information; A first lens array disposed between the first SLM and the second SLM comprises: passing a beam through the LC and the first SLM to a second SLM; And a second SLM reproducing the white image or the filter image; And causing a second lens array positioned in front of the second SLM to image an image generated through the second SLM onto a virtual image plane.

As described above, according to the embodiments of the present invention, it is possible to function as both an integrated image display and a holographic display through temporal multiplexing, and to provide an optimized three-dimensional Thereby generating / providing an image.

Particularly, according to the embodiments of the present invention, there is no speckle noise, image quality is high near the panel, and the sharpness of the image does not deteriorate in an area far from the panel.

1 is an overall configuration diagram of a 3D display system according to an embodiment of the present invention;

2 is a structural view of a unit optical engine,

3 is a view showing a state of a unit optical engine operating in an integrated image display mode,

4 is a view showing the state of a unit optical engine operating in a holographic display mode,

5 shows the representation range of an integrated image display and a holographic display,

6 is a flowchart provided in the description of the 3D display control method according to another embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to the drawings.

1 is an overall configuration diagram of a 3D display system according to an embodiment of the present invention. A 3D display system according to an embodiment of the present invention is a system for expressing an optimal image by selectively combining merits of an integrated image display and a holographic display.

In the 3D display system according to the embodiment of the present invention, both the incoherent image required by the integrated image display and the complex field required by the holographic display are expressed by a time multiplexing method.

1, a 3D display system according to an exemplary embodiment of the present invention performs such functions as a Polymer Dispersed Liquid Crystal (PDLC), an Amplitude Spatial Light Modulator (SLM) 1, a lens array, 1 (LA1), an amplitude SLM2, a lens array 2 (LA2), and a lens array 3 (LA3).

The amplitude SLM1 is an SLM for expressing an image, and the amplitude SLM2 is an SLM for expressing a filter image. The focal length of the lens array 1 (LA1) and the lens array 2 (LA2) is f, and the focal length of the lens array 3 (LA3) is F.

As shown in the lower portion of FIG. 1 (lower left of the 3D display system), a portion cut in the vertical direction along each lens of the lens arrays LA1, LA2 and LA3 is assumed to be a unit optical engine, Will be described in detail below.

2 is a configuration diagram of a unit optical engine. Since the unit optical engine corresponds to each lens of the lens arrays LA1, LA2, LA3, the 3D display system according to the embodiment of the present invention shown in Fig. 1 is a two-dimensional array of the unit optical engine shown in Fig. 2 It can be thought that it is constituted.

As shown in FIG. 2, a collimated laser beam is irradiated from a laser light source (not shown) behind the unit optical engine, and passes through a PDLC having transmission or scattering characteristics depending on whether a voltage is applied. This PDLC plays a role in determining the coherency of the light source.

The beam passing through the PDLC passes through the amplitude SLM1. The amplitude SLM1 passes through the primary image (primary image) of the integrated image display and the fringe image (main information of the holographic display) Display.

The lens 1 with the focal distance f is located at a distance f from the amplitude SLM1 and the lens 2 with the focal distance f located at a distance 2f away from the lens 1 is located and the inverted upper, A 4f system having a virtual image plane connec- ting an image is constructed.

On the other hand, in the frequency domain of the 4f system (the plane spaced apart from the lens 1 by f), the amplitude SLM2 that can display the filter image is located, and it is possible to decide whether to generate the complex field or the incoherent image in the image plane.

Also, at a distance F away from the Image Plane, the lens 3 with a focal length F is positioned so that the entire system can function as an integrated imaging system.

The unit optical engines of the 3D display system according to the embodiment of the present invention repeatedly switch the integrated image display mode for generating an integrated image and the holographic display mode for generating a hologram according to a time multiplexing method. Hereinafter, the operation in each mode will be described in detail.

3 is a view showing a state of a unit optical engine operating in an integrated image display mode.

PDLC is an LC panel that can change the scattering mode and the transmission mode according to the alignment state of liquid crystal molecules. In scattering mode, the PDLC is in Diffuser state, breaking the coherency of the collimated laser beam, which is the incoming light source, and converting it into an incoherent light source. On the other hand, in the transmission mode, the PDLC maintains the coherency of the light source so that it can function as a collimated coherent light source.

Amplitude SLM2 is an LC panel that reproduces a filter image. It functions as a transparent window when it is in the transmission mode in which a white image is displayed. In the filter mode, it can function as a spatial filter by displaying an appropriate filter image.

Accordingly, in the integrated image display mode, the PDLC operates in the scattering mode and the amplitude SLM2 operates in the transmission mode (functioning as a transparent window by reproducing a white image as shown in the lower part of FIG. 3).

Therefore, the image generated by the incoherent light source irradiating the amplitude SLM1 passes through the 4f system and is transmitted to the image plane. However, since there is no modulation in the frequency domain, the image of the amplitude SLM1 is inverted in the image plane.

Therefore, if the inverted image of the basic image for the integrated image is displayed on the amplitude SLM1, then the image is displayed through the lens 3 and functions as an integrated image display.

4 is a view showing the state of the unit optical engine operating in the holographic display mode.

In the holographic display mode, the PDLC operates in the transmission mode and the amplitude SLM2 operates in the filter mode (functions as a spatial filter by reproducing the filter image as shown in the lower part of Fig. 4).

At this time, the amplitude SLM2 functions as a spatial bandpass filter that generates a filter image shown in black except for the circular portion or the rectangular portion, as shown in the lower portion of Fig. 4, and transmits only the circular portion or the rectangular portion do.

Thus, the collimated laser beam passes through the PDLC and irradiates the amplitude SLM1, and the light wave diffracted by the amplitude SLM1 is filtered by the spatial filter indicated by the amplitude SLM2 in the frequency domain of the 4f system to express the complex field image in the image plane. .

In this case, the complex field value can be calculated through the hologram image generation method in consideration of the fact that the three-dimensional image to be expressed is imaged by the lens 3, and the Fringe image to be displayed in the amplitude SLM1 can be calculated using the shape of the spatial filter of the amplitude SLM2 Can be easily calculated by using the encoding method according to the encoding method.

By switching the integrated image mode shown in FIG. 3 and the holographic display mode shown in FIG. 4 at a high speed, it is possible to simultaneously display a stereoscopic image represented by an integrated image and a stereoscopic image represented by a holographic display through temporal multiplexing have.

The three-dimensional display of the integrated image display system has limited depth regions that can be expressed before and after the panel.

Accordingly, as shown in FIG. 5, the depth range in which the integrated image can be expressed based on the LA3 is defined as FDR (Frontal Depth Range) and PDR (Posterior Depth Range). As shown in FIG. 5, the FDR is a depth range from a front surface of the panel forward to a specific distance, and the PDR is a depth range from a front surface of the panel to a rearward specific distance.

In addition, the 3D image to be expressed is displayed in an integrated image display within a range where the integrated image can be expressed, and the range exceeding the expression range (FDR, PDR) of the integrated image is expressed by a holographic display, Lt; / RTI >

In order to do this, the target three-dimensional image data is cut into a range in which the integrated image can be expressed and a reference plane in which the holographic display can express the three-dimensional data, and a basic image is generated for the three- For the data beyond the possible range, a fringe image is generated and synchronized with the mode conversion of the entire display system, and the corresponding image is displayed on the amplitude SLM1.

6 is a flowchart provided in the description of the 3D display control method according to another embodiment of the present invention.

In the integrated image display mode in which the integrated image data is input (S110), the PDLC is controlled to operate in the scattering mode (S120), the amplitude SLM1 reproduces the integrated image (S130), and the amplitude SLM2 is controlled to operate in the transmission mode (S140).

On the other hand, in the holographic display mode in which the holographic image data (Fringe Image) is inputted (S150), the PDLC is controlled to operate in the transmission mode (S160), the amplitude SLM1 reproduces the fringe image (S170) And controls to operate in the filter mode (S180).

Up to now, a three-dimensional display system and method using integrated images and holography have been described in detail with preferred embodiments.

In the exemplary embodiment of the present invention, a display system capable of functioning both as an integrated image display and a holographic display through temporal multiplexing is proposed, and an optimized three-dimensional (3D) image display capable of taking advantage of an integrated image display and a holographic display So that it can display the image.

Thereby, there is no speckle noise near the panel, the image quality is high, and the sharpness of the image does not fall in the area far from the panel.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the present invention.

Claims (12)

LC (Liquid Crystal) for scattering or transmitting incident light; A first SLM (Spatial Light Modulator) for representing image information; And a second SLM for reproducing a white image or a filter image. The method according to claim 1, In the integrated image display mode, The LC scatters the incident light, The first SLM represents an integrated image, And the second SLM reproduces a white image. The method of claim 2, In the integrated image, Is displayed in a depth range from a front surface of the panel of the image display system to a specific distance forward. The method of claim 2, In the integrated image, Wherein the image display system is displayed in a depth range from a front surface of the image display system to a rearward specific distance. The method according to claim 1, In the holographic display mode, The LC transmits the incident light, The first SLM represents a fringe image, And the second SLM reproduces the filter image. The method of claim 5, In the holographic image, Wherein the image display system is displayed in a depth range exceeding a specific distance forward from a panel front side of the image display system. The method of claim 5, In the holographic image, Wherein the image display system is displayed in a depth range exceeding a specific distance from the front of the panel to the rear of the image display system. The method according to claim 1, In the LC, And the diffusing state is shifted to the diffuser state to scatter the plane wave. The method according to claim 1, Wherein the second modulator comprises: And a spatial band pass filter that generates an image in black except for the circular portion or the rectangular portion and transmits only the circular portion or the rectangular portion. LC (Liquid Crystal) scattering or transmitting incident light; A first SLM (Spatial Light Modulator) expressing image information; And the second SLM reproducing the white image or the filter image. LC (Liquid Crystal) for scattering or transmitting incident light; A first SLM (Spatial Light Modulator) for representing image information; A second SLM for reproducing a white image or a filter image; A first lens array disposed between the first SLM and the second SLM for transmitting a beam having passed through the LC and the first SLM to the second SLM; And And a second lens array positioned in front of the second SLM to cause the image to be projected onto a virtual image plane. LC (Liquid Crystal) scattering or transmitting incident light; A first SLM (Spatial Light Modulator) expressing image information; A first lens array disposed between the first SLM and the second SLM comprises: passing a beam through the LC and the first SLM to a second SLM; And The second SLM reproducing the white image or the filter image; And causing a second lens array positioned in front of the second SLM to image the image generated through the second SLM onto a virtual image plane.

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