CN110879478A - An integrated imaging 3D display device based on compound lens array - Google Patents

Abstract

The invention discloses an integrated imaging 3D display device based on a composite lens array. The electric control mask plate can realize two states, and different areas of the electric control mask plate are controlled to be in full black and transparent states respectively, so that light can be controlled to pass through and be shielded in different areas; the compound lens array is used for modulating light rays emitted by the micro image array on the display and reconstructing a 3D image on two planes with different central depths; the synchronous controller is used for controlling the micro-image array switching on the display to be synchronous with the electric control mask plate switching; based on the persistence of vision effect of human eyes, an observer can visually see the 3D images on the two central depth planes simultaneously, and the depth-of-field enhanced integrated imaging 3D display is realized.

Description

An integrated imaging 3D display device based on compound lens array

1. Technical field

The invention relates to the technical field of three-dimensional display, in particular to an integrated imaging three-dimensional display device based on a compound lens array.

2. Background technology

The integrated imaging 3D display technology belongs to the true 3D display technology. The microlens array is used to record the 3D information of the three-dimensional scene at different angles, and the 3D image of the three-dimensional scene is reproduced by using the microlens array with the same parameters as the recording. According to the principle of light reversibility, A 3D image with the same color, depth and other information as the original 3D scene is reproduced. The integrated imaging 3D display has the advantages of naked-eye viewing, true 3D reproduction, no fatigue, correct depth cues, and quasi-continuous viewing viewpoints.

The 3D images reconstructed by the integrated imaging system are located on different depth planes, and each depth plane is composed of multiple spatial pixels, which are composed of multiple pixels on the display modulated by corresponding lens elements. The light emitted by the pixels on the display is refracted by the microlens array and then focused to form intersections. The planes where these intersections are located are called the central depth plane, that is, the plane composed of the smallest space pixels. The image formed on the central depth plane has the highest resolution. When it is far away from the central depth plane, the voxels of the 3D image will gradually spread. When the diameter of the pixel spreads beyond the minimum resolution distance of the human eye, the 3D image observed by the human eye will be It will no longer be clear. The distance between the two depth planes when the diameter of the spatial pixel is equal to the minimum resolution distance of the human eye is defined as the depth of field of the integrated imaging display system. Since the traditional integrated imaging 3D display system has only one central depth plane, so the depth of field of the reproduced 3D image is limited to a small range near the central depth plane.

In order to increase the depth of field of 3D images, the typical technologies currently proposed are vibrating lens array method, variable-focus lens array method, and dual-display method. The core of these three methods is to increase the number of central depth planes to increase 3D images The depth of field of the image. Among them, the vibrating lens array method needs to use the vibrating lens array technology and requires the micro-image array and the lens array to vibrate synchronously, which requires very high precision of the mechanical process and is difficult to realize; the variable-focus lens array method is an effective method to change the liquid crystal by controlling the voltage. The refractive index changes the focal length of the lens element. At present, there are problems such as complex production process, high production cost, small electronically controlled zoom range, large size of the formed focal spot, and difficulty in producing a large area array; in the dual-display method, Since the transmittance of the transmissive display screen itself is only 50%, and the emissive display screen is blocked, the brightness of the entire system will be low, and the display effect will be unsatisfactory.

3. Content of the Invention

The present invention proposes an integrated imaging 3D display device based on a compound lens array. As shown in FIG. 1 , the device is composed of a synchronous controller, a display, an electronically controlled mask, a compound lens array and a diffusion screen.

The synchronization controller generates a synchronization timing signal, which is used to control the synchronous switching between the micro-image array displayed on the display and the electronically controlled mask.

The display is used to display the integrated imaging sheet source, namely the integrated imaging micro-image array.

The electronically controlled mask, as shown in Figure 2, the subunit of the electronically controlled mask is composed of two regions, A and B. The side length of the subunit of the electronically controlled mask is equal to the diameter of the large-diameter lens in the compound lens array, and the region The diameter of B is equal to the diameter of the small aperture lens in the compound lens array. The electronically controlled mask can realize two states, as shown in Figures 3 and 4, in state 1, the area A of all the electronically controlled mask subunits is completely black, and the light is blocked, and all the Area B is transparent, allowing light to pass through; in state 2, area B of all electronic control mask sub-units is completely black, blocking the light, and area A of all sub-units is transparent, allowing light to pass through. As shown in Figures 5 to 7, there are three placement methods for the electronically controlled mask: the first method, the electronically controlled mask is placed between the composite lens array and the display; the second method, the electronically controlled mask is placed in the composite lens array between the large-diameter lens array and the small-diameter lens array; in the third method, the electronically controlled mask plate is placed between the compound lens array and the diffusion screen.

The compound lens array is composed of a large-diameter lens array and a small-diameter lens array, wherein the large-diameter lens array is directly below the small-diameter lens array.

The diffuser screen is used to receive 3D images, scatter light, and eliminate the grid effect caused by the electronically controlled mask and the gap between the lenses, so that the original discontinuous 3D image can be reconstructed into a continuous light field, so that the The corresponding 3D image can be seen from any angle.

The principle of the integrated imaging 3D display device based on the compound lens array is shown in Figures 8 and 9. When the electronically controlled mask is in state 1, the light emitted by each pixel on the micro-image array passes through the mask. When , the light on the area A is intercepted, the light on the area B is modulated by the large-diameter lens and the small-diameter lens through the mask to form the central depth plane 1, and each pixel on the micro-image array converges near the central depth plane 1 A 3D image point is formed into a 3D image, and the position of the central depth plane 1 can be obtained by the Gaussian formula:

where f ₁ is the focal length of the large aperture lens in the display device, f ₂ is the focal length of the small aperture lens, g is the distance from the display to the composite lens array, d is the distance between the large aperture lens and the small aperture lens, and l ₁ is the central depth plane The distance from 1 to the compound lens array; when the electronically controlled mask is in state 2, when the light emitted by each pixel on the micro-image array passes through the mask, the light in area B is intercepted, and the light in area A passes through the mask It is only modulated by a large-diameter lens to form a central depth plane 2. Each pixel on the micro-image array converges into a 3D image point near the central depth plane 2 to form a 3D image. The position of the central depth plane 2 can be obtained by the Gaussian formula:

where l ₂ is the distance from the center depth plane 2 to the compound lens array.

The invention utilizes a synchronous controller to control the electronically controlled mask to switch between the state 1 and the state 2 rapidly, and simultaneously controls the micro-image array switching on the display to be synchronized with the switching of the electronically controlled mask. Based on the visual persistence effect of the human eye, the observer can Visually, the 3D images on the above two central depth planes can be seen at the same time, so as to achieve the purpose of enhancing the depth of field.

4. Description of the attached drawings

The foregoing aspects and features of the present invention will be further clarified and easily understood from the following detailed description in conjunction with the accompanying drawings and embodiments, wherein:

1 is a schematic structural diagram of an integrated imaging 3D display device based on a compound lens array

Accompanying drawing 2 is electric control mask and its subunit structure

3 is a schematic diagram of the electronically controlled mask in state 1

Accompanying drawing 4 is the electric control mask schematic diagram in state 2

Figure 5 is a schematic diagram of the electronically controlled mask placed between the compound lens array and the display, (a) state 1, (b) state 2

6 is a schematic diagram of an electronically controlled mask placed between the large-diameter lens array and the small-diameter lens array of the compound lens array, (a) state 1, (b) state 2

Figure 7 is a schematic diagram of the electronically controlled mask placed between the compound lens array and the diffusion screen, (a) state 1, (b) state 2

8 is a schematic diagram of the optical path when the liquid crystal mask is in state 1

9 is a schematic diagram of the optical path when the liquid crystal mask is in state 2

The symbols in the above figures are:

1 monitor, 2 electronically controlled reticle, 3 compound lens array, 4 reconstructed 3D image 1, 5 reconstructed 3D image 2, 6 diffuser screen, 7 viewer, 8 sync controller, 9 micro image array, 10 electronically controlled reticle state 1 corresponds to the central depth plane 1, 11 corresponds to the central depth plane of the electronically controlled mask state 2 2, 12 Small aperture lens array in the compound lens array, 13 Large aperture lens array in the compound lens array

It should be understood that the above drawings are schematic only and are not drawn to scale.

Five, the specific implementation

A typical embodiment of an integrated imaging 3D display device based on a compound lens array of the present invention is described in detail below, and the present invention is further described in detail. It is necessary to point out that the following examples are only used to further illustrate the present invention, and should not be construed as limiting the scope of protection of the present invention. Those skilled in the art make some non-essential improvements to the present invention according to the above-mentioned content of the present invention. and adjustment, still belong to the protection scope of the present invention.

The present invention proposes an integrated imaging 3D display device based on a compound lens array. As shown in FIG. 1 , the device consists of a synchronous controller, a display, an electronically controlled mask, a compound lens array and a holographic function screen.

In this example, the synchronization controller generates a synchronization timing signal for controlling the synchronous switching between the micro-image array displayed on the display and the electronically controlled mask.

In this embodiment, the display is used to display an integrated imaging micro-image array.

In this embodiment, the electrically-controlled mask is an electrically-controlled liquid crystal mask, and the first placement method is adopted, and the electrically-controlled mask is placed between the composite lens array and the display.

In this embodiment, the compound lens array is composed of a large-diameter lens array and a small-diameter lens array, wherein the large-diameter lens array is directly below the small-diameter lens array.

In this embodiment, the diffuser screen is a 5° diffuser screen, which is used to receive 3D images and scatter light to eliminate the grid effect caused by the electronically controlled mask and the gap between the lenses, so that the original discontinuous 3D image can be reconstructed. It is a continuous light field, so that the corresponding 3D image can be seen at each viewing angle.

In this embodiment, the focal length of the large-diameter lens is 18mm, the focal length of the small-diameter lens is 15mm, the distance from the display to the composite lens array is 8mm, and the distance between the large-diameter lens and the small-diameter lens is 5mm. When the electronically controlled mask is in state 1, when the light emitted by each pixel on the micro-image array passes through the mask, the light in area A is intercepted, and the light in area B passes through the mask and is blocked by the large-diameter lens and the small-diameter lens Commonly modulated to form a central depth plane 1, and each pixel on the micro-image array converges into a 3D image point near the central depth plane 1 to form a 3D image. From the formula (1), the distance from the central depth plane 1 to the compound lens array can be obtained. The distance is 48mm. When the electronically controlled mask is in state 2, when the light emitted by each pixel on the micro-image array passes through the mask, the light in area B is intercepted, and the light in area A passes through the mask and is only modulated by the large-diameter lens, forming a In the center depth plane 2, the pixels on the micro-image array converge into 3D image points near the center depth plane 2 to form a 3D image. From the formula (2), the distance from the center depth plane 2 to the compound lens array can be obtained as 14.4mm .

The invention utilizes a synchronous controller to control the electronically controlled mask to switch between state 1 and state 2 rapidly, and simultaneously controls the micro-image array switching on the display to be synchronized with the switching of the electronically controlled mask. Based on the visual persistence principle of the human eye, the observer can Visually, the 3D images on the above two central depth planes can be seen at the same time, so as to achieve the purpose of enhancing the depth of field.

Claims (2)

1. An integrated imaging 3D display device based on a compound lens array, characterized in that the device is made up of a synchronous controller, a display, an electronically controlled mask, a compound lens array and a diffusion screen, and the display is used for displaying integrated Imaging micro-image array; the subunit of the electronically controlled mask is composed of two regions, A and B, the side length of the subunit of the electronically controlled mask is equal to the diameter of the large-diameter lens in the composite lens array, and the diameter of the region B is the same as that of the composite lens. The diameters of the small-diameter lenses in the array are equal, and the electronically controlled mask can realize two states. In state 1, the area A of all the electronically controlled mask subunits is completely black, and the light is blocked, and the area B of all the electronically controlled masked subunits is completely black. Transparent, allowing the light to pass through. In state 2, the area B of all the electronically controlled mask sub-units is completely black, blocking the light, and the area A of all the sub-units is transparent, allowing the light to pass through; the compound lens array is composed of large The aperture lens array and the small aperture lens array are composed of the large aperture lens array directly below the small aperture lens array, which is used to modulate the light emitted by the micro-image array displayed on the display, and reconstruct the image on two different center depth planes. 3D image; the diffuser screen is used to receive 3D images and scatter light to eliminate the grid effect caused by the electronically controlled mask and the lens gap, so that the original discontinuous 3D image is reconstructed into a continuous light field, thereby Corresponding 3D images can be seen at each viewing angle; the synchronous controller is used to control the electronically controlled mask to switch rapidly between two states, and to control the micro-image array switching and the electronically controlled mask switching on the display at the same time Synchronization, based on the visual persistence effect of the human eye, the observer can visually see the 3D images on the above two central depth planes at the same time, realizing the integrated imaging 3D display with enhanced depth of field. 2 . An integrated imaging 3D display device based on a compound lens array according to claim 1 , wherein the electronically controlled mask plate in the device has three placement modes: the first mode is that the electronically controlled mask plate is placed in the first mode. 3 . Between the composite lens array and the display; in the second method, the electronically controlled mask is placed between the large-diameter lens array and the small-diameter lens array of the composite lens array; in the third method, the electronically controlled mask is placed between the composite lens array and the small-diameter lens array. between diffusers.

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