CN105988228B - Three-dimensional display device and three-dimensional display method thereof - Google Patents

Abstract

The invention provides a three-dimensional display device and a three-dimensional display method thereof, wherein the three-dimensional display device comprises: the display device comprises at least two layers of microlens arrays, a display device and a polarizing device, wherein the polarizing device arranged between the display device and the microlens arrays converts the polarization direction of light in a time division multiplexing mode, so that each layer of microlens arrays sequentially refracts the light. By applying the invention, the three-dimensional display quality can be improved.

Description

Three-dimensional display device and three-dimensional display method thereof

technical field

The present invention relates to the technical field of naked-eye three-dimensional display, and in particular, the present invention relates to a three-dimensional display device and a three-dimensional display method thereof.

Background technique

Compared with the two-dimensional display technology, the three-dimensional display technology can truly reproduce the scene of the objective world to a certain extent, making people feel immersed in the scene. much attention.

According to the different imaging principles, 3D display technology is divided into two categories: the first category is the non-naked eye 3D display technology based on binocular parallax, but it needs to wear special equipment (such as polarized glasses or helmet) to see 3D stereoscopic imaging, The entertainment and naturalness of viewing is reduced, and long-term viewing is also accompanied by problems such as visual fatigue and decreased comfort. The second category is naked-eye three-dimensional display technology represented by holographic, volume three-dimensional and grating. Among them, the holographic stereoscopic display system requiring coherent light illumination and the volume 3D stereoscopic display system requiring high-speed rotation of the display screen have complex structures.

Compared with the complex holographic and volume 3D systems, the grating-type naked-eye 3D display technology with simple equipment and continuous observation points is more widely used.

At present, the grating type naked-eye three-dimensional display device mainly adopts a layer of microlens array with a grating type structure to realize the naked-eye three-dimensional display. Specifically, the process of realizing three-dimensional display can be divided into two parts: recording and reproduction. During recording, the microlens array of grating structure can be used to record the object space information of different viewing angles to form an element image array; during reproduction, the element image array is displayed through the display screen. The lens is used to image the image displayed on the display screen from different viewing angles to form the original appearance.

However, the current naked-eye three-dimensional display devices still have many limitations in display. For example, the display resolution is not high; the user can only see the correct three-dimensional image when viewing within a small display viewing angle or within a small distance from the display screen, otherwise ghosting will occur.

Therefore, it is necessary to provide a three-dimensional display device capable of improving display quality.

SUMMARY OF THE INVENTION

In view of the above-mentioned defects in the prior art, the present invention provides a three-dimensional display device and a three-dimensional display method thereof, which can improve the quality of three-dimensional display.

The present invention provides a three-dimensional display device, comprising:

At least two-layer microlens array, display device and polarization device, wherein:

The polarization device disposed between the display device and the microlens array converts the polarization direction of light in a time-division multiplexing manner, so that each layer of the microlens array performs light refraction in sequence.

Preferably, the display device is used for displaying each sub-image of a frame of three-dimensional image in a time-division multiplexing manner.

According to another aspect of the present invention, there is also provided a three-dimensional display method, the method comprising:

The display device displays a three-dimensional image;

The polarization device disposed between the display device and the multi-layer microlens array converts the polarization direction of light in a time-division multiplexing manner, so that each layer of the microlens array performs light refraction in sequence.

Preferably, the display device displays each sub-image of a frame of three-dimensional image in a time-division multiplexing manner.

In the solution of the present invention, at least two layers of microlens arrays are used in the three-dimensional display device to alternately perform the function of refraction for three-dimensional display. Since the microlens array can provide parallax in both horizontal and vertical directions, the three-dimensional display device can display 3D images are closer to real objects.

Moreover, in the technical solution of the present invention, after adjusting the focal lengths of the microlens arrays of each layer and the positional relationship of the microlens arrays of each layer relative to the display screen in the display device, the method of time division multiplexing can be used to display one frame of three-dimensional images during a period of time. In the method, the polarizing device is used to convert the polarization direction of the light according to the set polarization conversion period, and the display device displays the sub-image corresponding to the microlens array currently playing the role of refraction, so that the three-dimensional display of the microlens array of each layer is alternately performed, which improves the 3D display quality such as display resolution, display depth range, or display viewing angle.

Additional aspects and advantages of the present invention will be set forth in part in the following description, which will be apparent from the following description, or may be learned by practice of the present invention.

Description of drawings

FIG. 1 is a schematic structural diagram of a three-dimensional display device according to an embodiment of the present invention;

2a is a schematic diagram of a microlens array in which a microlens is a positive lens according to an embodiment of the present invention;

2b is a schematic diagram of a microlens array in which the microlenses are negative lenses according to an embodiment of the present invention;

3a and 3b are schematic structural diagrams of a three-dimensional display device with increased resolution according to an embodiment of the present invention;

3c is a schematic diagram of the arrangement of a two-layer microlens array according to an embodiment of the present invention;

3d is a corresponding relationship between a display screen and a microlens array when the resolution is improved according to an embodiment of the present invention;

4a and 4b are schematic structural diagrams of a three-dimensional display device with improved viewing angle according to an embodiment of the present invention;

4c is a corresponding relationship between a display screen and a microlens array when the viewing angle is improved according to an embodiment of the present invention;

5a and 5b are schematic diagrams of the structure of a three-dimensional display device with increased display depth according to an embodiment of the present invention;

FIG. 5c is the corresponding relationship between the display screen and the microlens array when the depth of view is increased according to the embodiment of the present invention.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

Terms such as "module" and "system" used in this application are intended to include computer-related entities such as, but not limited to, hardware, firmware, a combination of hardware and software, software, or software in execution. For example, a module may be, but is not limited to, a process running on a processor, a processor, an object, an executable program, a thread of execution, a program, and/or a computer. For example, both an application running on a computing device and the computing device can be modules. One or more modules can reside within a process and/or thread of execution, and a module can also reside on one computer and/or be distributed between two or more computers.

The inventors of the present invention have considered that at least two layers of microlens arrays can be used to achieve a more realistic display of objects, as well as enhanced display quality. Specifically, the method of time division multiplexing can be used, and the polarization control unit is used to control the polarization direction of the converted light of the polarization conversion device, so that the microlens arrays of each layer alternately play the role of optical refraction, and at the same time, the display screen displays and displays under the control of the display image engine. The sub-image corresponding to the microlens array that currently plays the role of refraction. In this way, according to the sub-image displayed on the display screen, the polarization direction, and the coordination between the microlens arrays, the imaging angle or the number of imaging microlenses can be increased within the reaction time of the human eye, so as to realize the display viewing angle or display resolution. or according to the multiple display depth ranges formed by the different focal lengths of the microlens arrays of each layer, so as to achieve the effect of improving the comprehensive display depth range of the three-dimensional display device.

The technical solutions of the present invention will be described in detail below with reference to the accompanying drawings.

The present invention provides a three-dimensional display device, as shown in FIG. 1 , comprising: a display device 110 , at least two layers of microlens arrays 102 , and a polarizing device 120 disposed between the display device and the microlens array.

The polarization device 120 converts the polarization direction of the light in a time-division multiplexing manner, so that each layer of the microlens array performs light refraction in sequence.

Further, the display device 110 displays each sub-image of one frame of the three-dimensional image in a time-division multiplexing manner.

The display device 110 specifically includes: a display screen 101 and a display image engine 106 .

The polarization device 120 specifically includes: a polarization conversion device 104 and a polarization control unit 105 .

In practical applications, each layer of the microlens array 102 can be arranged in parallel with the display screen 101; each microlens in the microlens array 102 has the same structure, the microlenses are arranged in a rectangle or a hexagon, and the adjacent microlenses are arranged in a The pitches are equal. In practical applications, the microlenses in the microlens array may be positive lenses, or the microlenses may also be negative lenses, as shown in Figures 2a and 2b.

In the three-dimensional display device of the present invention, in order to realize that the microlens arrays of each layer can alternately refract light under the incident light of different polarization directions, the crystal optical axes of the microlens arrays of adjacent layers can form a predetermined angle.

In the three-dimensional display device of the present invention, the microlens array may have multiple refractive indices, that is, the refractive indices of the microlens array are different under light of different polarization directions.

In order to enable the microlens array to have a refractive effect under certain circumstances, a spacer material layer 103 may be provided between each layer of the microlens array 102, and the refractive index of the spacer material layer is the same as one of the refractive indices of the microlens array. The thickness of the spacer material layer 103 can be set in the order of microns.

In this way, when the current refractive index of the microlens array is the same as the refractive index of the spacer material layer 103, there is no light refraction effect; when the current refractive index of the microlens array is different from the refractive index of the spacer material layer 103, light refraction can be performed .

Considering that air also has a certain refractive index, in practical applications, no spacer material layer may be provided between the microlens arrays; correspondingly, the refractive index of the microlens array 102 and the air between the When the indices of refraction are different, the microlens array 102 has a refraction effect.

In the solution of the present invention, the microlens array 102 in the three-dimensional display device may be two layers, and correspondingly, the microlens array 102 has birefringence; the display device 110 displays two sub-images of one frame of three-dimensional image in a time-division multiplexing manner; The polarization device 120 and the display device 110 are switched synchronously to switch the polarization directions of the two types of light in a time-division multiplexing manner, so that the microlens arrays of each layer perform light refraction in sequence, and respectively refract and display each sub-image.

Alternatively, the microlens array 102 in the three-dimensional display device may be three-layered, and correspondingly, the microlens array 102 has three refractive indices; the display device 110 displays three sub-images of a frame of three-dimensional image in a time-division multiplexing manner; the polarizing device 120 and the The display device 110 switches synchronously, and switches the polarization directions of the three types of light in a time-division multiplexing manner, so that each layer of the microlens array is refracted to display each sub-image respectively.

Alternatively, the microlens array 102 in the three-dimensional display device may be four layers, and correspondingly, the microlens array 102 has four refractive indices; the display device 110 displays four sub-images of one frame of three-dimensional image in a time-division multiplexing manner; the polarizing device 120 and the The display device 110 switches synchronously, and switches the polarization directions of the four types of light in a time-division multiplexing manner, so that each layer of the microlens array is refracted to display each sub-image respectively.

For example, when the microlens array 102 in the three-dimensional display device is specifically two layers and the microlens array 102 is specifically birefringent, that is, when the three-dimensional display device includes the first microlens array 1021 and the second microlens array 1022, The crystal optical axes of the first microlens array 1021 and the second microlens array 1022 of adjacent layers may be orthogonal to each other. For example, in the case where the microlens array 102 in the three-dimensional display device is specifically two layers and the microlens array 102 is specifically birefringent, the direction of the crystal optical axis of the microlens array 102 in one layer is parallel to the display screen 101, and the other is The direction of the crystal optical axis of a layer of microlens array 102 is perpendicular to the display screen 101 .

In the case where the microlens array 102 in the three-dimensional display device is specifically two layers and the microlens array 102 is specifically birefringent, for the spacer material layer 103 of single refractive index, its refractive index can be the same as the birefringence of the microlens array 102 One of the ratios has the same refractive index. Assuming that the value of the birefringence of the microlens array 102 jumps between n1 and n2, the refractive index of the spacer material layer 103 may be n2 among them. In this way, when the birefringence of the microlens array 102 is n2, the light will not be refracted when passing through the microlens array 102 and the spacer material layer 103 .

In the three-dimensional display device of the present invention, the polarization conversion device 104 of the polarization device 120 is disposed between the display screen 101 and the microlens array 102; the polarization control unit 105 of the polarization device 120 is used to control the polarization conversion device 104 to convert the polarization direction of light.

In practical applications, after the polarization conversion device 104 converts the polarization direction of the light, under the incident light in the polarization direction, the refractive index of the microlens array 102 with the same crystal optical axis as the polarization direction and the refractive index of the spacer material layer 103 take values. The refractive index of the microlens array 102 and the refractive index of the spacer material layer 103 of other layers whose crystal optical axis is different from the polarization direction are the same. Therefore, according to the relationship between the direction of the crystal optical axis of each layer of the microlens array 102 and the display screen, the polarization control unit 105 can control the polarization conversion device 104 to convert the polarization direction of the incident light to change the refractive index of each layer of the microlens array 102. value.

When the microlens array 102 in the three-dimensional display device is specifically two layers and the microlens array 102 is specifically birefringence, the polarization device 120 can convert the polarization direction of the light according to the set polarization conversion period, so that the light is parallel to the display The orientation of the device 110 and the direction perpendicular to the display device 110 are switched.

In this embodiment of the present invention, one frame of three-dimensional image display period may include two set display switching periods, and the display device may switch and display each sub-image of one frame of three-dimensional image according to the set display switching period. Therefore, in order to complete the three-dimensional display of one frame of three-dimensional images, the set polarization conversion period of the polarization device 120 may be the same as the set display switching period. In this way, during the three-dimensional image display period, while the polarization device converts the polarization direction of light, the display device can switch and display sub-images of a frame of three-dimensional image, thereby completing the three-dimensional display of one frame of three-dimensional image.

For example, in one frame of three-dimensional image display period, the polarization direction of the converted light in one time period is parallel to the display device 110 ; the polarization direction of the converted light in another time period is perpendicular to the display device 110 .

Specifically, the polarization control unit 105 in the polarization device 120 controls the polarization conversion device 104 to convert the polarization direction of the light to be parallel to the display screen 101 for one period of time during the display period of a frame of three-dimensional image; and controls the polarization conversion device 104 for another period of time. The polarization direction of the converted light is perpendicular to the display screen 101 .

In this way, when the polarization direction of the light is parallel to the display screen 101, the refractive index of the microlens array 102 and the refractive index of the spacer material layer 103 are different in the direction of the optical axis of the crystal parallel to the display screen, and the direction of the optical axis of the crystal is vertical The refractive index of the microlens array 102 on the display screen is the same as the refractive index of the spacer material layer 103 .

Further, considering that after the polarization conversion device 104 converts the polarization direction of the light, under the incident light in this polarization direction, the microlens array 102 having a different refractive index from the spacer material layer 103 has a refraction effect; The microlens array 102 with the same refractive index has no refractive effect, and appears as an optical flat plate.

Therefore, in the three-dimensional display device of the present invention, the display image engine 105 of the display device 110 can control the display screen 101 of the display device 110 to display and match the incident light in the polarization direction according to the polarization direction of the light converted by the polarization conversion device 104 The sub-images corresponding to the microlens array 102 with refraction effect.

Wherein, the sub-image corresponding to the microlens array 102 having the refraction effect under the incident light in the polarization direction may be based on the focal length of the microlens array 102, the angle between the center of the microlens array 102 and the center of the display screen 101, etc. factor, which is obtained by transforming the three-dimensional image of the object to be displayed. For the transformation of the three-dimensional image, technical means known to those skilled in the art can be used, which will not be described in detail here.

Based on the above three-dimensional display device, the present invention also provides a three-dimensional display method of the three-dimensional display device, the method mainly includes:

The display device displays a three-dimensional image; the polarizing device 120 disposed between the display device 110 and at least two layers of microlens arrays converts the polarization directions of light in a time-division multiplexing manner, so that each layer of the microlens arrays performs light refraction in sequence.

Specifically, the display device 110 displays a plurality of sub-images of one frame of image in a time-division multiplexing manner.

In this way, in a frame of three-dimensional image display period, in different time periods, according to the conversion of the polarization direction of the light, each microlens array 102 alternately refracts light, and provides corresponding sub-images displayed on the display screen 101 in the display device 110. Imaging.

In practical applications, the content of the sub-image corresponding to the microlens array 102 having the refraction effect is the same as the imaging content of the object to be displayed after being refracted by the microlens array. In this way, according to the principle of reversibility of the optical path, after the sub-image corresponding to the microlens array is displayed on the display screen, the three-dimensional display of the object to be displayed can be realized by the microlens array.

Moreover, since the microlens array can provide parallax in the horizontal and vertical directions, the three-dimensional image displayed by the microlens array is relatively close to the object to be displayed.

More preferably, in the three-dimensional display device of the present invention, the microlens array 102 can use an electronically controlled multi-refractive index material; when a set voltage is applied to the microlens array 102, the microlens array 102 has the same refraction as the spacer material layer 103 Rate. That is to say, when the polarization direction of the incident light is converted, the refractive index of the microlens array 102 does not change, and is the same as the refractive index of the spacer material layer, so it does not have a refractive effect. In this way, the three-dimensional display device can display two-dimensional images. When a three-dimensional image needs to be displayed, another set voltage can be applied to the microlens array 102, so that the microlens array 102 can restore the above-mentioned multi-refractive index characteristic. In this way, by controlling the voltage applied to the microlens array 102 in the three-dimensional display device, switching between the two-dimensional display model and the three-dimensional display model can be realized, thereby improving user experience.

More preferably, in the three-dimensional display device of the present invention, the focal length of each layer of microlens arrays in the three-dimensional display device, the positional relationship of each layer of microlens arrays relative to the display screen in the display device, and the Sub-images can improve the quality of 3D display and provide users with better visual effects.

Based on the above-mentioned three-dimensional display device and three-dimensional display method thereof, the present invention provides technical solutions of three specific embodiments.

Among them, in the technical solution of the first embodiment, in order to improve the resolution of the three-dimensional display, the microlenses in the multi-layer microlens array can be staggered, and for the microlens array that has a refraction effect after converting the polarization direction of the light, in the The corresponding sub-image is displayed in the corresponding position in the display screen.

In the technical solution of the second embodiment, in order to improve the three-dimensional display viewing angle, the microlenses in the multi-layer microlens array can be staggered, and for the microlens array that has a refraction effect after converting the polarization direction of light, in the display screen The corresponding sub-images are displayed in the same display position of .

In the technical solution of the third embodiment, in order to improve the depth of the three-dimensional display, the microlenses in the multi-layer microlens array with the same focal length can be aligned, and for the microlens array that has a refraction effect after converting the polarization direction of the light, in the The corresponding sub-image is displayed in the same display position in the display screen.

Example 1

As shown in FIGS. 3 a and 3 b , the three-dimensional display device according to the first embodiment of the present invention includes: a display device 1110 , at least two layers of microlens arrays 1102 , and a polarizing device 1120 disposed between the display device and the microlens array.

The display device 1110 specifically includes: a display screen 1101 and a display image engine 1106 .

The polarization device 1120 specifically includes: a polarization conversion device 104 and a polarization control unit 105 .

Further, the three-dimensional display device may further include: a spacer material layer 103 disposed between the microlens arrays 1102 of each layer.

Wherein, in the three-dimensional display device of the first embodiment, each layer of the microlens array 1102 is arranged parallel to the display screen 1101; The microlenses in the lens array 1102 are staggered.

For example, when the microlens array 1102 in the three-dimensional display device is specifically two layers and the microlens array 1102 is specifically birefringent, the microlenses in the second microlens array 1122 are relatively different from those in the first microlens array 1121. The microlenses are staggered.

The offset between the microlenses can be set by those skilled in the art based on experience. For example, the microlenses in the second microlens array 1122 differ from the adjacent microlenses in the first microlens array 1121 by m pitches in the horizontal and vertical directions; where m is 1/2, or other non-integer. Figure 3c shows the arrangement of a two-layer microlens array with microlenses differing by 1/2 pitch.

Because the microlenses in the first microlens array and the second microlens array are different in horizontal and vertical positions; for the same object, the imaging after passing through the first microlens array and the second microlens array, respectively, is in position and display. The content is different.

Therefore, in order to make the user perceive the same object at the viewing position, and perceive more abundant three-dimensional stereoscopic imaging at this position, that is, three-dimensional stereoscopic imaging with higher resolution.

In the technical solution of the first embodiment of the present invention, the polarization device 1120 can convert the polarization direction of the light according to the set polarization conversion period, so that the light is converted in a direction parallel to the display device 1110 and a direction perpendicular to the display device 1110; at the same time, The display device 1110 switches and displays the first sub-image and the second sub-image of a frame of three-dimensional image according to the set display switching period; wherein, the first sub-image is displayed on the first display position of the display screen 1101, and the second sub-image is displayed on the display screen The second display position of 1101 is displayed.

For example, in a frame of three-dimensional image display period of the polarization device 1120, the polarization direction of the converted light in one time period is parallel to the display device 1110; the polarization direction of the converted light in another time period is perpendicular to the display device 1110; In the frame 3D image display period, the first sub-image is displayed in the first display position of the display screen 1101 in one time period; the second sub-image is displayed in the second display position of the display screen 1101 in another time period.

Specifically, as shown in FIG. 3d , the display image engine 1106 can control the display screen 1101 to display the first sub-image at the first display position during one period of time in a frame of three-dimensional image display period; The second display position displays the second sub-image.

In the technical solution of the first embodiment of the present invention, the first display position and the second display position differ by m pitches in the horizontal and vertical directions; the first sub-image and the second sub-image are obtained by transforming the three-dimensional image based on different imaging angles .

Specifically, the first imaging angle is determined according to the angle between the center of the first microlens array 1121 in the two-layer microlens array and the center of the display screen 1101; The angle between the center of the display screen 1101 determines the second imaging angle. In this way, the three-dimensional image is transformed based on the first and second imaging angles, respectively, to obtain the first sub-image and the second sub-image. That is, the first sub-image is a sub-image corresponding to the first microlens array 1121 , and the second sub-image is a sub-image corresponding to the second microlens array 1122 .

In practical applications, it can be assumed that the direction of the crystal optical axis of the first microlens array 1121 is perpendicular to the display screen 1101 , and the direction of the crystal optical axis of the second microlens array 1122 is parallel to the display screen 1101 .

Based on the three-dimensional display device according to the first embodiment of the present invention, in order to improve the three-dimensional display resolution, the following methods can be used to perform three-dimensional display:

During a period of time in a frame of three-dimensional image display cycle, while the display image engine 1106 controls the display screen 1101 to display the first sub-image at the first display position, the polarization control unit 104 controls the polarization conversion device 105 to convert the polarization direction of the light into perpendicular to the display screen 1101, as shown in Figure 3a.

In this way, in this polarization direction, the refractive index of the first microlens array 1121 and the refractive index of the spacer material layer 103 are different in value, so that the function of a lens can be exerted. The first sub-image corresponding to the microlens array 1121 is displayed three-dimensionally. The refractive index of the second microlens array 1122 is the same as the refractive index of the spacer material layer 103 , and it is represented as an optical flat plate.

Furthermore, as shown in FIG. 3b, in another time period in the display period of one frame of three-dimensional image, the display image engine 1106 controls the display screen 1101 to display the second sub-image at the second display position, while the polarization control unit 104 controls the polarization conversion Device 105 converts the polarization direction of the light to be parallel to display screen 1101 .

In this way, in this polarization direction, the refractive index of the second microlens array 1122 is different from the refractive index of the spacer material layer 103, according to the value of the refractive index corresponding to the second microlens array 1122 displayed on the display screen 1101 at the second display position The second sub-image is displayed in three dimensions. The refractive index of the first microlens array 1121 is the same as the refractive index of the spacer material layer 103 , which is represented as an optical flat plate.

In the technical solution of the first embodiment of the present invention, since the microlenses in the second microlens array 1122 and the microlenses in the first microlens array 1121 are arranged in a staggered manner, the polarization control unit 104 uses the polarization control unit 104 at a frequency higher than the reflection time of the human eye. Controlling the polarization conversion device 105 to switch the polarization direction, and at the same time, the display image engine 1106 controls the display screen 1101 to display the corresponding sub-images at the corresponding positions, so that the first microlens array 1121 and the second microlens array 1122 are alternately imaged, and the overall imaging effect is Objectively, it can be equivalent to the imaging effect after increasing the number of microlenses participating in the imaging display. Therefore, the human eye can perceive the same three-dimensional object, and the resolution is improved.

Embodiment 2

As shown in Figures 4a and 4b, the three-dimensional display device according to the second embodiment of the present invention includes: a display device 2110, at least two layers of microlens arrays 1202, and a polarizing device 2120 disposed between the display device and the microlens array.

The display device 2110 specifically includes: a display screen 1201 and a display image engine 1206 .

The polarization device 2120 specifically includes: the polarization conversion device 104 and the polarization control unit 105 .

Further, the three-dimensional display device may further include: a spacer material layer 103 disposed between the microlens arrays 1202 of each layer.

Among them, in the three-dimensional display device according to the second embodiment of the present invention, each layer of the microlens array 1202 is arranged in parallel with the display screen 1201; The microlenses in the adjacent microlens array 1202 are staggered.

For example, when the microlens array 1202 in the three-dimensional display device is specifically two layers and the microlens array 1202 is specifically birefringent, the direction of the crystal optical axis of the first microlens array 1221 is perpendicular to the display screen 1201, and the second The direction of the crystal optical axis of the microlens array 1222 is parallel to the display screen 1201; and the microlenses in the second microlens array 1222 and the adjacent microlenses in the first microlens array 1221 differ in the horizontal and vertical directions m pitches; where m is 1/2, or other non-integer.

Considering that the large three-dimensional display viewing angle can ensure the user's comfort in viewing the three-dimensional display content, the viewing angle jumps and ghosting will not occur due to the simple movement of the user's head. In fact, when the microlenses in the microlens arrays of each layer are staggered relative to the microlenses in the adjacent microlens arrays, for the same object, the images after passing through the microlens arrays of each layer are in position and display content. above are not the same.

Therefore, more preferably, in the technical solution of the second embodiment of the present invention, in order to enable the user to see a three-dimensional image without ghost images in a larger viewing angle, the polarization device 2120 converts the polarization direction of the converted light according to the set polarization, so that the The light is switched in a direction parallel to the display device 2110 and a direction perpendicular to the display device 2110; at the same time, the display device 2110 switches and displays the first sub-image and the second sub-image of a frame of three-dimensional image according to the set display switching cycle; wherein , the first sub-image and the second sub-image are displayed at the same position on the display screen.

For example, in one frame of three-dimensional image display period of the polarization device 2120, the polarization direction of the converted light in one time period is parallel to the display device 2110; the polarization direction of the converted light in another time period is perpendicular to the display device 2110; at the same time, the display device 2110 can In a three-dimensional image display period of one frame, the first sub-image is displayed on the display screen in one time period; the second sub-image is displayed at the same position of the display screen in another time period.

Specifically, as shown in FIG. 4c, the display image engine 1206 in the display device 2110 controls the display screen 1201 to display the first sub-image in one period of time in the display cycle of a frame of three-dimensional images; another period of time controls the display screen 1201 to display the first sub-image in the same period. A second sub-image is displayed at the location.

In the technical solution of the second embodiment of the present invention, the first sub-image and the second sub-image are obtained by transforming the three-dimensional image based on different imaging angles. Specifically, the first imaging angle is determined according to the angle between the center of the first microlens array 1221 in the two-layer microlens array and the center of the display screen 1201; The angle between the center of the display screen 1201 determines the second imaging angle. In this way, the three-dimensional image is transformed based on the first imaging angle and the second imaging angle, respectively, to obtain the first sub-image and the second sub-image.

In practical applications, it can be assumed that the direction of the crystal optical axis of the first microlens array 1221 is perpendicular to the display screen 1201 , and the direction of the crystal optical axis of the second microlens array 1222 is parallel to the display screen 1201 .

Based on the three-dimensional display device according to the second embodiment of the present invention, in order to improve the three-dimensional display viewing angle, the following methods can be used for three-dimensional display:

As shown in FIG. 4a, during a period of time in a frame of three-dimensional image display cycle, while the display image engine 1206 controls the display screen 1201 to display the first sub-image at the first display position, the polarization control unit 104 controls the polarization conversion device 105 to display the first sub-image at the same time. The polarization direction of the light is converted to be perpendicular to the display screen 1201 . In this way, in this polarization direction, the refractive index of the first microlens array 1221 and the refractive index of the spacer material layer 103 are different in value. The corresponding first sub-image is displayed in three dimensions.

Then, as shown in FIG. 4b, in another time period in the display period of one frame of three-dimensional image, the display image engine 1206 controls the display screen 1201 to display the second sub-image at the second display position, while the polarization control unit 104 controls the polarization conversion. Device 105 converts the polarization direction of the light to be parallel to display screen 1201 . In this way, in this polarization direction, the refractive index of the second microlens array 1222 is different from the refractive index of the spacer material layer 103. Therefore, according to the value of the refractive index of the second microlens array 1222 displayed on the display screen 1201 at the second display position, the value of the refractive index of the second microlens array 1222 The corresponding second sub-image is displayed in three dimensions.

In the technical solution of the second embodiment of the present invention, since the microlenses in the second microlens array 1222 and the microlenses in the first microlens array 1221 are arranged in a staggered manner, the polarization control unit 104 uses the polarization control unit 104 at a frequency higher than the reflection time of the human eye. Controlling the polarization conversion device 105 to switch the polarization direction, and at the same time, the display image engine 1206 controls the display screen 1201 to display the corresponding sub-images at the same position, so that the first microlens array 1221 and the second microlens array 1222 are alternately imaged, and the comprehensive imaging effect is as follows: Objectively, it can be equivalent to the imaging effect of rapidly moving a layer of microlens array to make imaging at different angles. Therefore, compared with imaging with a layer of microlens array, a larger three-dimensional display viewing angle can be obtained.

Embodiment 3

As shown in Figures 5a and 5b, the three-dimensional display device according to the third embodiment of the present invention includes: a display device 3110, at least two layers of microlens arrays 1302, and a polarizing device 3120 disposed between the display device and the microlens array.

The display device 3110 specifically includes: a display screen 1301 and a display image engine 1306 .

The polarization device 3120 specifically includes: the polarization conversion device 104 and the polarization control unit 105 .

Further, the three-dimensional display device may further include: a spacer material layer 103 disposed between the microlens arrays 1302 of each layer.

The inventor of the present invention found that in the raster naked-eye three-dimensional display technology, the focal length of the lens determines the center depth plane, and the display depth range of the three-dimensional display is formed around the center depth plane, that is, the display depth of the three-dimensional display The range is related to the focal length of the lens.

Therefore, in the three-dimensional display device of the third embodiment of the present invention, the microlenses in the microlens arrays 1302 of each layer are aligned and arranged; and the focal lengths of the microlens arrays 1302 of each layer are different.

In the case where the microlens array 1302 in the three-dimensional display device is specifically two layers and the microlens array 1302 is specifically birefringence, the two-layer microlens array (ie the first microlens array 1321 and the second microlens array 1322 ) The microlenses are aligned; and the focal lengths of the microlenses in the two-layer microlens array are different.

Since the focal lengths of the first microlens array 1321 and the second microlens array 1322 are different, for the same object, the imaging contents after passing through the first microlens array and the second microlens array respectively are different.

In order to make the three-dimensional object seen by the user at the viewing position the same, in the technical solution of the third embodiment of the present invention, the polarization device 3120 converts the polarization direction of the light according to the set polarization conversion period, so that the light is parallel to the display device 3110. At the same time, the display device 3110 switches and displays the first sub-image and the second sub-image of a frame of three-dimensional image according to the set display switching cycle; wherein, the first sub-image and the second sub-image The sub-images are displayed at the same position on the display screen.

For example, in a frame of three-dimensional image display cycle of the polarization device 3120, the polarization direction of the converted light in one time period is parallel to the display device 3110; the polarization direction of the converted light in another time period is perpendicular to the display device 3110; In the frame three-dimensional image display period, the first sub-image is displayed on the display screen 1301 in one time period; the second sub-image is displayed at the same position on the display screen 1301 in another time period.

Specifically, the display image engine 1306 in the display device 3110 can control the display screen 1301 to display the first sub-image in one time period in a frame of three-dimensional image display cycle; and control the display screen 1301 to display the second sub-image at the same position in another time period subimage.

In the technical solution of the third embodiment of the present invention, the first sub-image and the second sub-image are obtained by transforming the three-dimensional image based on different focal lengths; the first focal length coefficient is the focal length of the first microlens array 1321; the second focal length coefficient is The focal length of the second microlens array 1322 .

In practical applications, it can be assumed that the direction of the crystal optical axis of the first microlens array 1321 is perpendicular to the display screen 1301 , and the direction of the crystal optical axis of the second microlens array 1322 is parallel to the display screen 1301 .

Based on the three-dimensional display device according to the third embodiment of the present invention, in order to improve the depth range of the three-dimensional display, the following methods can be used for three-dimensional display:

During a period of time in a frame of three-dimensional image display cycle, the display image engine 1306 controls the display screen 1301 to display the first sub-image, while the polarization control unit 104 controls the polarization conversion device 105 to convert the polarization direction of the light to be perpendicular to the display screen. 1301, as shown in Figure 5a.

In this way, in this polarization direction, the refractive index of the first microlens array 1321 and the refractive index of the spacer material layer 103 are different in value, and can function as a lens. The corresponding first sub-image is displayed in three dimensions.

Further, as shown in FIG. 5b, in another time period in the display period of one frame of three-dimensional image, while the display image engine 1306 controls the display screen 1301 to display the second sub-image at the same position, the polarization control unit 104 controls the polarization conversion device 105 converts the polarization direction of the light to be parallel to the display screen 1301.

In this way, in this polarization direction, the refractive index of the second microlens array 1322 is different from the refractive index of the spacer material layer 103. According to the second sub-image corresponding to the second microlens array 1322 displayed on the display screen 1301, 3D display.

In the technical solution of the third embodiment of the present invention, since the focal lengths of the aligned first microlens array 1321 and the second microlens array 1322 are different, the polarization control unit 104 controls the polarization conversion at a high speed at a frequency higher than the reflection time of the human eye. The device 105 switches the polarization direction, and at the same time, the display image engine 1306 controls the display screen 1301 to display the corresponding sub-images at the same position, so that the first microlens array 1321 and the second microlens array 1322 are alternately imaged. As shown in FIG. 5c , after the two display depth ranges corresponding to the first microlens array 1321 and the second microlens array 1322 are superimposed, a larger three-dimensional display depth range can be obtained, thereby improving the three-dimensional display quality.

In the technical solution of the present invention, at least two layers of microlens arrays are used in the three-dimensional display device to perform three-dimensional display, and the microlens array can provide parallax in two directions, horizontal and vertical, so that the three-dimensional image displayed by the three-dimensional display device is closer to the on real objects.

Moreover, after adjusting the focal lengths of the microlens arrays of each layer and the positional relationship of the microlens arrays of each layer relative to the display screen, the present invention can adopt the method of time division multiplexing, and use the polarization control unit to control the polarization direction of the converted light by the polarization conversion device, so that The micro-lens arrays of each layer alternately play the role of optical refraction, and the display screen displays the sub-images corresponding to the micro-lens array currently playing the role of refraction under the control of the display image engine, so as to improve the display resolution, display depth range or display. 3D display quality such as viewing angle.

As will be appreciated by those skilled in the art, the present invention includes apparatuses for performing one or more of the operations described in this application. These devices may be specially designed and manufactured for the required purposes, or they may include those known in general purpose computers. These devices have computer programs stored in them that are selectively activated or reconfigured. Such a computer program may be stored in a device (eg, computer) readable medium including, but not limited to, any type of medium suitable for storing electronic instructions and coupled to a bus, respectively Types of disks (including floppy disks, hard disks, optical disks, CD-ROMs, and magneto-optical disks), ROM (Read-Only Memory, read-only memory), RAM (Random Access Memory, random access memory), EPROM (Erasable Programmable Read-Only Memory, Erasable Programmable Read-Only Memory), EEPROM (Electrically Erasable Programmable Read-Only Memory, Electrically Erasable Programmable Read-Only Memory), flash memory, magnetic card or optical card. That is, a readable medium includes any medium that stores or transmits information in a form that can be read by a device (eg, a computer).

Those skilled in the art will understand that computer program instructions can be used to implement each block of these structural diagrams and/or block diagrams and/or flow diagrams, and combinations of blocks in these structural diagrams and/or block diagrams and/or flow diagrams . Those skilled in the art can understand that these computer program instructions can be provided to a general-purpose computer, a professional computer or a processor of other programmable data processing methods to implement, so that the present invention can be executed by a processor of a computer or other programmable data processing method. The block or blocks specified in the block or blocks of the block diagrams and/or block diagrams and/or flow diagrams of the invention are disclosed.

Those skilled in the art can understand that the various operations, methods, steps, measures, and solutions discussed in the present invention may be alternated, modified, combined or deleted. Further, other steps, measures, and solutions in the various operations, methods, and processes that have been discussed in the present invention may also be alternated, modified, rearranged, decomposed, combined, or deleted. Further, steps, measures and solutions in the prior art with various operations, methods, and processes disclosed in the present invention may also be alternated, modified, rearranged, decomposed, combined or deleted.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be It is regarded as the protection scope of the present invention.

Claims (25)

1. A three-dimensional display device comprising at least two layers of a microlens array, a display means and a polarizing means, wherein:

the polarizing device is arranged between the display device and the micro lens arrays and converts the polarization direction of light in a time division multiplexing mode so that each layer of micro lens arrays sequentially refract light;

if the microlens array is specifically at least two layers, the microlenses in the at least two layers of microlens arrays are aligned, and the focal lengths of the microlenses in the at least two layers of microlens arrays are different;

the display device is used for switching and displaying a first sub-image and a second sub-image of a frame of three-dimensional image; the first sub-image and the second sub-image are obtained by converting the three-dimensional image based on different focal lengths.

2. The apparatus of claim 1, wherein the display means is for displaying sub-images of a frame of the three-dimensional image in a time-multiplexed manner.

3. The apparatus of claim 1, wherein crystal optic axes of the microlens arrays of adjacent layers are at a set angle.

4. The apparatus of claim 1, wherein the microlens array is embodied in two layers, and crystal optical axes of the two microlens arrays are orthogonal to each other.

5. The apparatus of claim 4, wherein the direction of the crystalline optical axes of one of the layers of microlens arrays is parallel to the display device and the direction of the crystalline optical axes of the other layer of microlens arrays is perpendicular to the display device.

6. A device as claimed in claim 5, characterized in that the polarization means are in particular adapted to switch the polarization direction of the light in accordance with a set polarization switching period, so that the light is switched in a direction parallel to the display means and in a direction perpendicular to the display means.

7. The apparatus according to claim 1, wherein the display means is adapted to switch to display the first sub image and the second sub image of the one frame of the three-dimensional image according to a set display switching period;

wherein the first sub-image and the second sub-image are displayed at the same position of the display screen.

8. The apparatus of any of claims 1-7, wherein the microlenses in the microlens array are positive lenses or the microlenses are negative lenses.

9. The apparatus of any of claims 1-7, wherein the microlenses in the microlens array are arranged in a rectangular or hexagonal pattern, and the pitch between adjacent microlenses is equal.

10. The apparatus of any of claims 1-7, further comprising:

a spacer material layer disposed between the microlens arrays.

11. The apparatus of claim 10, wherein the microlens array has a plurality of refractive indices; the refractive index of the spacer material layer is the same as one of the refractive indices of the microlens array.

12. The apparatus of claim 10, wherein the microlens array employs an electrically controlled multi-index material; and

the microlens array has the same refractive index as the spacer material layer when a set voltage is applied across the microlens array.

13. A three-dimensional display method, comprising:

the display device displays a three-dimensional image;

the polarization device arranged between the display device and at least two layers of micro-lens arrays converts the polarization direction of light in a time division multiplexing mode, so that each layer of micro-lens array orderly refracts light;

if the microlens array is specifically at least two layers, the microlenses in the at least two layers of microlens arrays are aligned, and the focal lengths of the microlenses in the at least two layers of microlens arrays are different;

the display device is used for switching and displaying a first sub-image and a second sub-image of a frame of three-dimensional image; the first sub-image and the second sub-image are obtained by converting the three-dimensional image based on different focal lengths.

14. The method of claim 13, wherein the displaying means displays a three-dimensional image, in particular comprising:

the display device displays each sub-image of a frame of three-dimensional image in a time division multiplexing manner.

15. The method of claim 13, wherein the crystalline optical axes of the microlens arrays of adjacent layers are at a set angle.

16. The method of claim 13, wherein the microlens array is embodied in two layers, and the crystal optical axes of the two microlens arrays are orthogonal;

the direction of the crystal optical axis of one layer of the micro lens array is parallel to the display device, and the direction of the crystal optical axis of the other layer of the micro lens array is perpendicular to the display device.

17. The method of claim 16, wherein the polarizing means converts the polarization direction of the light in a time division multiplexed manner, in particular comprising:

the polarizing means converts the polarization direction of the light in accordance with a set polarization conversion period so that the light is converted in a direction parallel to the display device and a direction perpendicular to the display device.

18. The method of claim 13, wherein the displaying means displays a plurality of sub-images of a frame of image in a time-division multiplexed manner, specifically comprising:

the display device switches and displays a first sub-image and a second sub-image of a frame of three-dimensional image according to a set display switching period;

wherein the first sub-image and the second sub-image are displayed at the same position of the display screen.

19. The method of any of claims 13-18, wherein the microlenses in the microlens array are positive lenses or the microlenses are negative lenses.

20. The method of any of claims 13-18, wherein the microlenses in the microlens array are arranged in a rectangular or hexagonal pattern with equal pitch between adjacent microlenses.

21. The method of any of claims 13-18, further comprising:

a spacer material layer disposed between the microlens arrays.

22. The method of claim 21, wherein the microlens array has a plurality of refractive indices; the refractive index of the spacer material layer is the same as one of the refractive indices of the microlens array.

23. The method of claim 21, wherein the microlens array employs an electrically controlled multi-index material; and

the microlens array has the same refractive index as the spacer material layer when a set voltage is applied across the microlens array.

24. An electronic device comprising a processor and a memory;

the memory having stored therein computer instructions;

the processor for invoking the computer instructions to perform the method of any of claims 13-23.

25. A computer-readable storage medium for storing computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 13 to 23.

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