CN101339309A - A transformable display screen and its three-dimensional display device - Google Patents

Abstract

The invention discloses a convertible display screen and a three-dimensional display device thereof. There are two types of convertible displays: reflective and transmissive. The reflective switchable display is composed of a polymer dispersed liquid crystal layer, a transmissive directional scattering screen, a mirror, or a polymer dispersed liquid crystal layer, and a reflective directional scattering screen; the transmissive convertible display is composed of a polymer dispersed liquid crystal layer, transmission type directional scattering screen. The three-dimensional display device based on the transformable display screen includes a high-speed projector, a mirror system, and a transformable display screen, which can be transformed to realize three-dimensional display of space body and three-dimensional display of spatial panoramic parallax. The polymer-dispersed liquid crystal layer is milky white when no electric field is applied, and acts as a projection scattering screen to realize volumetric three-dimensional display; when electric field is applied, it is transparent to realize panoramic parallax three-dimensional display. These two kinds of three-dimensional displays can be viewed by multiple people with naked eyes at 360°.

Description

A transformable display screen and its three-dimensional display device

technical field

The invention relates to an optical device, in particular to a convertible display screen and a three-dimensional display device thereof.

Background technique

Three-dimensional display technologies mainly include holographic three-dimensional display, volumetric three-dimensional display, and stereoscopic three-dimensional display. Holographic three-dimensional display requires high-resolution and high-speed spatial light modulators in dynamic display, which cannot meet the reproduction requirements of dynamic holographic three-dimensional images at present. The volumetric 3D display technology is to address in the three-dimensional space, control the brightness of the corresponding voxel, and finally scan out the three-dimensional object in the three-dimensional space. There are two kinds of volumetric display screens: vertical plane and helical plane. The volumetric three-dimensional display has horizontal and vertical parallax, 360° horizontally and 180° vertically, which is suitable for multiple people to surround and observe at the same time. Since the luminous direction and luminous solid angle of each individual pixel cannot be controlled when scanning in a three-dimensional space, there must be a problem of perspective blanking in spatial display, that is, the front and back of a three-dimensional object are visible at the same time. This is not consistent with our usual visual effect, and it will cause the front and rear views to overlap and cause confusion. How to realize a 3D display technology with a real sense of space that can be realized using the existing technology, and how to overcome the perspective blanking problem of the volume space 3D display becomes the key technology. Stereoscopic 3D has developed from the original parallax 3D display that required wearing polarized glasses to today's spatial panoramic parallax 3D display. The spatial panoramic parallax 3D display is a plane of directional scattering. The 360° full field of view space panoramic parallax three-dimensional display satisfies people's visual requirements well.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art and provide a convertible display screen and a three-dimensional display device thereof.

The convertible display screen has a polymer dispersed liquid crystal layer, a directional scattering screen and a mirror; the polymer dispersed liquid crystal layer is provided with transparent conductive films on both sides, and the two transparent conductive films are respectively connected to the positive and negative electrodes of the controllable power supply. connected with each other, the outside of the directional scattering layer is provided with reflective mirrors, and the directional scattering layer is a transmission type directional scattering screen.

The convertible display screen has a polymer-dispersed liquid crystal layer and a directional scattering screen; the polymer-dispersed liquid crystal layer is provided with transparent conductive films on both sides, and the two transparent conductive films are respectively connected to the positive and negative electrodes of the controllable power supply. The diffuser is a reflective directional diffuser.

The convertible display screen has a polymer dispersed liquid crystal layer and a directional scattering screen; the polymer dispersed liquid crystal layer is provided with a transparent conductive film on both sides, and the two transparent conductive films are respectively connected to the positive and negative electrodes of the controllable power supply. The directional scattering screen is a transmissive directional scattering screen.

The directional scattering screen is a holographic scattering screen or a binary optical element.

The three-dimensional display device includes a transformable display screen, a reflector system, and a high-speed projector. The image projected by the high-speed projector enters the reflector system through the center of the rotating shaft, and is then projected onto the rotating transformable display screen.

The mirror system is composed of 2 to 10 mirrors, reflective prisms or reflective mirrors and reflective prisms.

When the transformable display screen of the present invention is selected for three-dimensional display, the display device can scan a three-dimensional space scene with full parallax without blanking; when the three-dimensional display with spatial panoramic parallax is selected, the display device can display only horizontal parallax The three-dimensional space scene can realize the space blanking of the three-dimensional display; it can also control the polymer dispersed liquid crystal layer in time-sharing to realize the three-dimensional display of the two combinations. Both the three-dimensional display of space volume and the three-dimensional display of spatial panorama parallax based on the present invention can be viewed by multiple people with naked eyes at 360°.

Description of drawings

Fig. 1 is a schematic structural diagram of a reflective switchable display screen;

Fig. 2 is a schematic structural diagram of a reflective convertible display screen without mirrors;

Fig. 3 is a schematic structural diagram of a transmissive switchable display screen;

Fig. 4 is a schematic diagram of the principle of a three-dimensional display device with changeable display modes.

In the figure: polymer dispersed liquid crystal layer 1, directional scattering screen 2, transparent conductive film 3, controllable power supply 4, mirror 5, convertible display screen 6, mirror system 7, high-speed projector 8.

Detailed ways

As shown in Fig. 1, the switchable display screen 6 has a polymer dispersed liquid crystal layer 1, a directional scattering screen 2 and a reflector 5; wherein the two sides of the polymer dispersed liquid crystal layer 1 are respectively provided with transparent conductive films 3, and The transparent conductive film 3 is respectively connected with the positive and negative poles of the controllable power supply 4, and the outside of the directional scattering layer 2 is provided with a mirror 5, and the directional scattering layer 2 is a transmissive directional scattering screen. The directional scattering screen 2 is a holographic scattering screen or a binary optical element.

As shown in Figure 2, the switchable display screen 6 has a polymer-dispersed liquid crystal layer 1 and a directional scattering screen 2; wherein the polymer-dispersed liquid crystal layer 1 is provided with transparent conductive films 3 on both sides, and the two transparent conductive films 3 The positive and negative poles of the controllable power supply 4 are respectively connected, and the directional scattering screen 2 is a reflective directional scattering screen. The directional scattering screen 2 is a holographic scattering screen or a binary optical element.

As shown in Figure 3, the switchable display screen 6 has a polymer dispersed liquid crystal layer 1 and a directional scattering screen 2; wherein the polymer dispersed liquid crystal layer 1 is provided with transparent conductive films 3 on both sides, and the two transparent conductive films 3 The positive and negative poles of the controllable power supply 4 are respectively connected, and the directional scattering screen 2 is a transmission type directional scattering screen. The directional scattering screen 2 is a holographic scattering screen or a binary optical element.

Although the structures of the three switchable display screens are different, the switchable principle is the same, and the different states of the polymer-dispersed liquid crystal layer 1 are controlled by controlling the voltage of the controllable power supply 4 . When the controllable power supply 4 does not apply voltage, there is no electric field between the two transparent conductive films 3, and the polymer liquid crystal materials are arranged in disorder, so that light cannot penetrate the glass, and the polymer dispersed liquid crystal layer 1 becomes milky white; when the controllable When the power supply 4 applies voltage, there is an electric field between the two transparent conductive films 3, and the polymer liquid crystal materials are arranged in an orderly manner, so that light can pass through the liquid crystal layer, and the polymer dispersed liquid crystal layer 1 becomes transparent and colorless. When the polymer-dispersed liquid crystal layer 1 becomes milky white, the display screen can be converted into a diffuse projection screen; when the polymer-dispersed liquid crystal layer 1 becomes transparent, the directional scattering screen 2 will directionally scatter images, and the display screen can be converted at this time The screen can be rotated to realize the three-dimensional display of space panorama parallax.

As shown in Figure 4, the three-dimensional display device includes a convertible display screen 6, a reflector system 7, and a high-speed projector 8. The image projected by the high-speed projector 8 enters the reflector system 7 through the center of the rotating shaft, and is then projected onto the rotating transformable Display 6. The high-speed projector 1 needs to project thousands of frames of images per second at high speed. Assuming that the 3D scene is refreshed 15 times per second and 300 images per week, the high-speed projector must project 4500 frames per second. For better visuals, the frames per second are even higher. The reflective mirror system 7 is composed of 2 to 10 reflective mirrors, reflective prisms or reflective mirrors and reflective prisms. The three-dimensional display device can transform to realize volumetric three-dimensional display and spatial panorama parallax three-dimensional display. Volumetric 3D display needs to sequentially intercept M images of the 3D scene along the central axis section, and intercept an image every (360°/M). When displaying by rotating the screen, the central axis of the screenshot must be coaxial with the rotation axis of the screen, and M images are projected sequentially every week, so that each image is correctly displayed at the corresponding position. However, the screen rotation should be fast (at least 15 revolutions per second). Due to the persistence of vision of the human eye, a three-dimensional scene can be reproduced in a three-dimensional space. Volume 3D is the effect of directly simulating a 3D scene. However, the principle of spatial panoramic parallax 3D display is different from that of volumetric 3D display. It is to simulate people's actual viewing effect on a three-dimensional object. When the observer looks around an object, the observer's eyes see different visual scenes, so the observer can perceive the spatial position of the object. When the observer moves around the object, the field of view angle of the object seen will change accordingly. Therefore, if we can display an object in the order of the field of view from all directions around it one by one. As long as there are enough images of the field of view of the reproduced object, we can realistically reproduce the spatial three-dimensional scene. Generally, in order to make the three-dimensional display realistic, at least 300 images of the 360° field of view need to be taken. In order to satisfy the two eyes seeing different visual scenes, the light angle of the projected image must be strictly controlled, so that the image emits light at a small angle, and the images at different positions on the same screen correspond to the corresponding observers, so what the two eyes see has the correct parallax The binocular field of view image can form the correct stereoscopic parallax effect, and realize the three-dimensional display of spatial panoramic parallax. In addition, by switching the voltage of the controllable power supply 4 , the polymer-dispersed liquid crystal layer 1 is constantly switched between transparent, colorless and milky white states, which can realize volumetric three-dimensional display and spatial panoramic parallax three-dimensional display in time-sharing.

Claims (6)

1. convertible display screen, its characteristic are that convertible display screen (6) has macromolecule dispersal type liquid crystal layer (1), directional scattering screen (2) and catoptron (5); Wherein macromolecule dispersal type liquid crystal layer (1) both sides are respectively equipped with transparent conductive film (3), be connected with the both positive and negative polarity of controllable electric power (4) respectively at two transparent conductive films (3), the outside of directional scattering layer (2) is provided with catoptron (5), and directional scattering layer (2) is transmission-type directional scattering screen.

2. convertible display screen, its characteristic are that convertible display screen (6) has macromolecule dispersal type liquid crystal layer (1) and directional scattering screen (2); Wherein macromolecule dispersal type liquid crystal layer (1) both sides are respectively equipped with transparent conductive film (3), are connected with the both positive and negative polarity of controllable electric power (4) respectively at two transparent conductive films (3), and directional scattering screen (2) is reflection-type directional scattering screen.

3. convertible display screen, its characteristic are that convertible display screen (6) has macromolecule dispersal type liquid crystal layer (1) and directional scattering screen (2); Wherein macromolecule dispersal type liquid crystal layer (1) both sides are respectively equipped with transparent conductive film (3), are connected with the both positive and negative polarity of controllable electric power (4) respectively at two transparent conductive films (3), and directional scattering screen (2) is transmission-type directional scattering screen.

4. according to claim 1,2 or 3 described a kind of convertible display screens, its characteristic is that described directional scattering screen (2) is holographic diffuser screen or binary optical elements.

5. an employing is according to the three-dimensional display apparatus of claim 1,2 or 3 described convertible display screens, its characteristic is to comprise convertible display screen (6), mirror system (7), high-speed projector (8), the image that high-speed projector (8) projects enters mirror system (7) through the rotating shaft center, project to the convertible display screen (6) of rotation again.

6. a kind of three-dimensional display apparatus according to claim 5, its characteristic are that described mirror system (7) is made up of 2～10 catoptrons, reflecting prism or catoptrons and reflecting prism.

Images