CN109725428B - Light field display method and light field display engine - Google Patents
Light field display method and light field display engine Download PDFInfo
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- CN109725428B CN109725428B CN201910139676.1A CN201910139676A CN109725428B CN 109725428 B CN109725428 B CN 109725428B CN 201910139676 A CN201910139676 A CN 201910139676A CN 109725428 B CN109725428 B CN 109725428B
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Abstract
The invention relates to the field of display, in particular to a light field display method and a light field display engine.A projector sequentially projects a two-dimensional image information sequence within a specified visual angle range according to a time sequence, the two-dimensional image information sequence is reflected and scanned by a vibrating mirror and projected into a space within a corresponding visual angle range, the reflection angle of the vibrating mirror corresponds to the visual angle of a two-dimensional image one by one, and when the vibrating mirror scans to a specified angle position, the projector synchronously projects two-dimensional image information corresponding to the angular visual angle; the controller controls the galvanometer to scan back and forth within a set angle, simultaneously coordinates the time sequence of the projector, and synchronously projects two-dimensional image information corresponding to a view angle range according to the angle scanned by the galvanometer, thereby forming a three-dimensional image in space. The light field display method can obtain three-dimensional images with high resolution, large depth of field and large visual angle, and has the advantages of high safety factor, small system volume and convenient calibration.
Description
Technical Field
The invention relates to the field of display, in particular to a light field display method and a light field display engine.
Background
Different from the stereoscopic film and stereoscopic television technology in the market at present, the light field display technology can reconstruct the three-dimensional information of an object in space, can provide a stereoscopic image close to nature, does not have the obvious problem of visual fatigue, and is a true three-dimensional display technology. Compared with the holographic display technology, the light field display needs a small amount of auxiliary calculation and does not need coherent light illumination, so the method is considered to be a three-dimensional display technology with great prospect. The current light field display technology mainly comprises laminated light field display, projection array light field display, integrated imaging light field display and dynamic light field display. These light field display techniques have their own advantages, but also have disadvantages. So none have entered the mainstream market.
The stacked light field display is based on a four-dimensional light field principle, a space light field of a three-dimensional scene is constructed by utilizing a plurality of display layers, and the direction and color information of light rays in the scene are determined through pixel points on a plurality of display planes. And the brightness information of the pixel points on each plane is obtained by performing optimization solution through an iterative method according to the brightness and the space information of the three-dimensional scene. The three-dimensional effect of this display technology is limited by the number of display layers. The larger the number of display layers, the higher the three-dimensional depth of field and the resolution, but as the number of display layers increases, the image brightness will rapidly decay and the image contrast will also decrease greatly.
The projection array light field display technology utilizes a projector array to project light field images at different angles onto a large screen formed by a scattering screen, and then utilizes a lens array to output light field image information from a set angle to form a three-dimensional image in space. The technology can obtain three-dimensional information with larger area and higher resolution, but the system has huge structure and complicated calibration among arrays, and is not beneficial to integration.
The integrated imaging light field display technology utilizes a flat panel display to replace a projector array to display light field images at different angles, then utilizes a lens array to output light field image information from a set angle, and forms a three-dimensional image in space. This technique is simple in construction and easy to integrate, but its resolution, viewing angle and depth of field are limited by the resolution of the flat panel display and the imaging quality of the lens array.
The dynamic light field display technology utilizes a high-speed projector and a rotating optical screen to project light field information in different directions, and enables an observer to see a three-dimensional space image near the screen through a persistence of vision effect. The three-dimensional image of the system is displayed on an optical screen rotating at a high speed, the three-dimensional image cannot be explored, interaction is not facilitated, the system is large, the structure is unstable, and a large screen moving at a high speed has certain dangerousness.
Disclosure of Invention
In view of this, the present invention provides a light field display method and a light field display engine with high safety factor, high resolution and large depth of field to overcome the disadvantages of the background art.
The purpose of the invention is realized by the following technical scheme: a light field display method, the method comprising: the projector sequentially projects a two-dimensional image information sequence within a specified visual angle range according to a time sequence, the two-dimensional image information sequence is projected into a space corresponding to the visual angle range through reflection and scanning of a vibrating mirror, the reflection angles of the vibrating mirror correspond to the visual angles of the two-dimensional image one by one, and when the vibrating mirror scans to a specified angle position, the projector synchronously projects two-dimensional image information corresponding to the angular visual angle; the controller controls the galvanometer to scan back and forth within a set angle, simultaneously coordinates the time sequence of the projector, and synchronously projects two-dimensional image information corresponding to a view angle range according to the angle position scanned by the galvanometer, thereby forming a three-dimensional image in space.
A light field display engine, the system comprising: the controller is connected with the control circuit of the projector and the galvanometer; the projector sequentially projects two-dimensional image information sequences to the galvanometer according to a time sequence, the galvanometer reflects the two-dimensional image information sequences to a space in a specified view angle range through scanning, the two-dimensional image sequences are encoded with perspective information of three-dimensional images in the specified view angle range, the reflection angles of the galvanometer correspond to the view angles of the two-dimensional images one to one, and when the galvanometer scans to a specified angle position, the projector synchronously projects the two-dimensional image information corresponding to the angle view angles; the controller controls the galvanometer to scan back and forth within a set angle range, coordinates the projection time sequence of the projector, and synchronously projects two-dimensional image information according to the scanning angle of the galvanometer, so that a three-dimensional image is formed in space.
Further, the three-dimensional image output by the light field display engine can be received by a screen, and can also be directly formed into a three-dimensional image in a three-dimensional space without the screen.
Further, the two-dimensional image projected by the projector remains sharp in the depth of field occupied by the three-dimensional image.
Preferably, the galvanometer is a two-dimensional galvanometer, and scanning is performed in two orthogonal directions of X and Y.
Specifically, the two-dimensional galvanometer mirror is combined by two-dimensional independent galvanometer mirrors or a two-dimensional micro-electro-mechanical system galvanometer mirror.
As another preferable scheme, the galvanometer is a one-dimensional galvanometer, and scanning is performed in one direction.
Preferably, the light field information formed by scanning the one-dimensional galvanometer in one direction is preferably received by a scattering screen.
More preferably, the diffuser screen is an asymmetric diffuser screen.
The invention has the beneficial effects that:
(1) a new light field display method is provided, the use of a screen rotating at a high speed is effectively avoided by utilizing galvanometer scanning, the safety of a display system is improved, the volume of the system is greatly reduced, and the light field display method is simplified.
(2) A novel light field display system is provided, and the complicated light field information calibration and correction process in the traditional light field display system is avoided.
(3) A novel light field display system is provided, the scanning galvanometer is utilized to break through the limitation of optical devices such as a lens array, a display screen and the like, and three-dimensional images with high resolution, large depth of field and large viewing angle are realized.
Drawings
FIG. 1 is a schematic view of a light field display engine according to embodiment 1;
FIG. 2 is a schematic view of the light field display engine of embodiment 2;
FIG. 3 is a schematic view of the light field display engine of embodiment 3;
fig. 4 is a partial structure diagram of the light-transmitting screen of fig. 3.
Wherein, 1, a projector; 2, a galvanometer; 2-1, an X-axis galvanometer; 2-2, Y-axis galvanometer; 3-a controller; 4-a three-dimensional image; 5-a symmetric scattering screen; 6-asymmetric diffuser screen.
Detailed Description
Example 1
The present embodiment provides a light field display method and a light field display engine,
as shown in fig. 1. A light field display engine comprises a projector 1, a galvanometer 2 and a controller 3, wherein the controller 3 is connected with a control circuit of the projector 1 and the galvanometer 2. The galvanometer 2 is a two-dimensional micro-electro-mechanical system (MEMS) galvanometer that can be scanned back and forth in two orthogonal directions X and Y as shown in fig. 1. The reflected light rays of the projector 1 can be continuously scanned around the X and Y axes over the range of angles theta and phi, respectively, independently. The projector 1 sequentially projects two-dimensional image information sequences to the vibrating mirror 2 according to a time sequence, the two-dimensional image sequences encode perspective information of three-dimensional images within a specified view angle range, the vibrating mirror 2 reflects the two-dimensional image information sequences to a space within the specified view angle range through two-dimensional scanning, the reflection angles of the vibrating mirror 2 correspond to view angles for recording the two-dimensional images one by one, and when the vibrating mirror 2 scans to a specified angle position, the projector 1 synchronously projects the two-dimensional image information corresponding to the angle view angles. The controller 3 controls the galvanometer 2 to scan back and forth within a set angle, coordinates the projection time sequence of the projector 1, and synchronously projects a two-dimensional image information sequence according to the scanning angle of the galvanometer 2, so that a three-dimensional image 4 is formed in space.
The light field display method is displayed by the light field display engine, and the display method is already described in the light field display engine and is not described herein again.
Example 2
The present embodiment provides a light field display method and a light field display engine, as shown in fig. 2. A light field display engine comprises a projector 1, a galvanometer 2, a controller 3 and a symmetrical scattering screen 5; the galvanometer 2 is formed by combining two-dimensional independent galvanometer mirrors, wherein the galvanometer mirror in one dimension scans around an X axis to obtain the X-axis galvanometer 2-1, and the scanning angle is theta; and the galvanometer mirror in the other dimension scans around the Y axis, namely the galvanometer mirror 2-2 in the Y axis, and the scanning angle is phi. The controller 3 is connected with the control circuit of the projector 1 and the galvanometer 2. The projector 1 sequentially projects two-dimensional image information sequences to the vibrating mirror 2 according to a time sequence, the two-dimensional image information sequences encode perspective information of three-dimensional images within a specified view angle range, the vibrating mirror 2 reflects the two-dimensional image information sequences to a space within the specified view angle range through two-dimensional scanning, the reflection angles of the vibrating mirror 2 correspond to view angles for recording the two-dimensional images one by one, and when the vibrating mirror 2 scans to a specified angle position, the projector 1 synchronously projects the two-dimensional image information of the view angle corresponding to the angle. The controller 3 controls the galvanometer 2 to scan back and forth within a set angle, simultaneously coordinates the time sequence of the projector, and synchronously projects a two-dimensional image information sequence according to the scanning angle of the galvanometer 2, so that a three-dimensional image 4 is formed in the space near the symmetrical scattering screen 5.
Example 3
The present embodiment provides a light field display method and a light field display engine, as shown in fig. 3 and 4. A light field display engine comprises a projector 1, a one-dimensional galvanometer, a controller 3 and an asymmetric scattering screen 6. The one-dimensional galvanometer is scanned around the Y axis, namely the Y axis galvanometer 2-2, and the scanning angle is phi. The controller 3 is connected with the projector 1 and a control circuit of the Y-axis galvanometer 2-2. Specifically, in the present embodiment, the asymmetric diffuser screen 6 has asymmetric diffuser characteristics, as shown in fig. 4, the light rays 7 passing through the asymmetric diffuser screen 6 are diffused at a large angle along the y-axis direction of the asymmetric diffuser screen 6, and are diffused at a small angle along the x-axis direction of the asymmetric diffuser screen 6, so as to form a light ray diffusion region 8. The projector 1 sequentially projects a two-dimensional image information sequence to the Y-axis galvanometer 2-2 according to a time sequence, the two-dimensional image sequence is coded with perspective information of a three-dimensional image in a specified view angle range, the Y-axis galvanometer 2-2 reflects the two-dimensional image information sequence to a space in the specified view angle range through one-dimensional scanning, the reflection angle of the Y-axis galvanometer 2-2 corresponds to the view angle for recording the two-dimensional image one by one, and when the Y-axis galvanometer 2-2 scans to a specified angle position, the projector 1 synchronously projects the two-dimensional image information corresponding to the angle. The controller 3 controls the Y-axis galvanometer 2-2 to scan back and forth within a set angle, simultaneously coordinates the time sequence of the projector 1, synchronously projects a two-dimensional image information sequence according to the scanning angle of the Y-axis galvanometer 2-2, and forms a three-dimensional image 4 in the space near the asymmetric scattering screen 6.
Claims (2)
1. A light field display method is characterized in that a projector sequentially projects a two-dimensional image information sequence in a specified view angle range according to a time sequence, the two-dimensional image information sequence is projected into a space in a corresponding view angle range through reflection and scanning of a vibrating mirror, the reflection angle of the vibrating mirror corresponds to the view angle of a two-dimensional image one by one, and when the vibrating mirror scans to a specified angle position, the projector synchronously projects two-dimensional image information corresponding to the angle view angle at the specified angle position; the controller controls the galvanometer to scan back and forth within a set angle, simultaneously coordinates the time sequence of the projector, and synchronously projects two-dimensional image information corresponding to a view angle range according to the angle position scanned by the galvanometer so as to form a three-dimensional image in space, wherein the galvanometer is a two-dimensional micro-electro-mechanical system galvanometer and scans in X and Y orthogonal directions; the device comprises a projector, a galvanometer and a controller, and does not comprise a screen, and the reflected light of the projector can continuously scan in the range of angles theta and phi around X and Y axes respectively and independently; the two-dimensional image sequence is encoded with perspective information for a three-dimensional image within a specified view range.
2. A light field display engine, comprising: the projector, the galvanometer and the controller do not comprise a screen, and the controller is connected with a control circuit of the projector and the galvanometer; the projector sequentially projects two-dimensional image information sequences to the galvanometer according to a time sequence, the galvanometer reflects the two-dimensional image information sequences to a space in a specified view angle range through scanning, the two-dimensional image information sequences are encoded with perspective information of three-dimensional images in the specified view angle range, the reflection angles of the galvanometer correspond to the view angles of the two-dimensional images one to one, and when the galvanometer scans to a specified angle position, the projector synchronously projects the two-dimensional image information corresponding to the angle view angles; the controller controls the galvanometer to scan back and forth within a set angle range, simultaneously coordinates the projection time sequence of the projector, and synchronously projects two-dimensional image information corresponding to the view angle range according to the position of the scanning angle of the galvanometer so as to form a three-dimensional image in space; the three-dimensional image output by the light field display engine directly forms a three-dimensional image in a three-dimensional space; the galvanometer is a two-dimensional micro-electro-mechanical system galvanometer and scans in two orthogonal directions of X and Y; the reflected light of the projector can respectively and independently scan continuously around the X axis and the Y axis in the range of the angles theta and phi; the two-dimensional image sequence is encoded with perspective information for a three-dimensional image within a specified view range.
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