2D / 3D switchable display system

Abstract

The present application provides a 2D / 3D switchable display system, comprising: a light source for emitting light, a display screen for displaying image content carried by the light, and a polymer dispersed liquid crystal film, which is arranged on the side of the display screen facing away from the light source and has a scattering state and a transmission state, so as to present a 2D or 3D display effect for image content with different viewing angles passing through the display screen. The system can quickly realize real-time switching of 2D / 3D display at a low cost.

Description

Technical Field

[0001] The present application relates to the field of image display, and more specifically, to a switchable 2D / 3D display system. Background Art

[0002] In the display field, the display screen provides relevant information to the viewer, but the existing display screen usually provides two-dimensional (2D) display information, without the effect of stereoscopic display. Three-dimensional (3D) display has attracted more and more attention because it can provide stereoscopic display effect. Although 3D display technology has many advantages, the existing 3D display technology also has some disadvantages: such as limited field of view and easy to cause visual fatigue. To solve this problem, we propose a display technology that can switch between 2D display and 3D display in real time, which can realize 2D display or 3D display according to the needs of the viewer. Summary of the invention

[0003] The present application provides a 2D / 3D switchable display system, which may include: a light source for emitting light, a display screen for displaying image content, and a polymer dispersed liquid crystal film, which is arranged on the side of the display screen facing away from the light source and has a scattering state and a transmission state, so as to present image content at different viewing angles in the light passing through the display screen with a 2D or 3D display effect.

[0004] Furthermore, the 2D / 3D switchable display system provided by the present application may further include: a diffractive optical element. Exemplarily, the diffractive optical element is disposed between the light source and the polymer dispersed liquid crystal film.

[0005] In one embodiment, the diffractive optical element is disposed on the optical path of the light to separate the light emitted by the light source into light of different viewing angles. The display screen receives the light of different viewing angles from the diffractive optical element to display image contents of different viewing angles according to the light.

[0006] In one embodiment, the diffractive optical element is disposed on a side of the display screen facing away from the light source, and is used to separate the image content displayed by the light emitted by the light source after the display screen is loaded into image content of different viewing angles and project them onto the polymer dispersed liquid crystal film.

[0007] In one embodiment, a polymer dispersed liquid crystal film comprises: an organic solid polymer matrix; and a plurality of liquid crystal droplets dispersed in the organic solid polymer matrix; wherein, in the absence of an external electric field, the optical axes of at least a portion of the liquid crystal droplets are not parallel to each other.

[0008] In one example, a 2D / 3D switchable display system provided by the present application may also include: a voltage control system, which controls the power-on voltage applied to the polymer dispersed liquid crystal film to change the state of the polymer dispersed liquid crystal film so as to present a 2D or 3D display effect on image content at different viewing angles in the light passing through the display screen.

[0009] In one example, the voltage control system is configured to adjust the power-on voltage to put the polymer dispersed liquid crystal film in a transmissive state, so that image contents at different viewing angles can present a 3D display effect after passing through the polymer dispersed liquid crystal film.

[0010] In another example, when the voltage control system stops supplying power to the polymer dispersed liquid crystal film, the polymer dispersed liquid crystal film is in a scattering state and directly scatters image contents at different viewing angles to present the image contents with a 2D display effect.

[0011] In one embodiment, the polymer dispersed liquid crystal film is disposed on the side closest to the viewer.

[0012] In an exemplary embodiment, the diffractive optical element is adjacent to a first side of a display screen, and the polymer dispersed liquid crystal film is attached to the display screen at a second side of the display screen opposite the first side.

[0013] In an exemplary embodiment, the diffractive optical element is close to the side of the display screen facing away from the light source, and the side of the diffractive optical element away from the display screen is attached to the polymer dispersed liquid crystal film.

[0014] In one embodiment, the diffractive optical element is a pixelated grating.

[0015] In one embodiment, the display screen is LCD, LED, OLED or Mirco-LED.

[0016] The present application also provides a method for manufacturing a 2D / 3D switchable display system, the method comprising: providing a light source for emitting light; providing a display screen for displaying image content on the optical path of the light; and providing a polymer dispersed liquid crystal film having a scattering state and a transmission state on a side of the display screen facing away from the light source, so as to present a 2D or 3D display effect for image content at different viewing angles in the light passing through the display screen.

[0017] In one embodiment, the method further includes: setting a diffractive optical element on the optical path of the light emitted by the light source to separate the light emitted by the light source into light of different perspectives, wherein the display screen receives the light of different perspectives from the diffractive optical element to display image content of different perspectives according to the light.

[0018] In one embodiment, the method further includes: arranging a diffractive optical element on a side of the display screen facing away from the light source, for separating the image content displayed on the display screen into image content of different viewing angles, and projecting the image content onto the polymer dispersed liquid crystal film.

[0019] In one embodiment, the method also includes: providing an electrically conductive voltage control system for the polymer dispersed liquid crystal film, for controlling the power-on voltage applied to the polymer dispersed liquid crystal film to change the state of the polymer dispersed liquid crystal film, thereby presenting a 2D or 3D display effect on image content at different viewing angles in the light passing through the display screen.

[0020] In one embodiment, the voltage control system is configured to adjust the power-on voltage to put the polymer dispersed liquid crystal film in a transmissive state, so that image contents at different viewing angles can present a 3D display effect after passing through the polymer dispersed liquid crystal film.

[0021] In one embodiment, when the voltage control system stops supplying power to the polymer dispersed liquid crystal film, the polymer dispersed liquid crystal film is in a scattering state and directly scatters image contents at different viewing angles to present the image contents with a 2D display effect.

[0022] In one embodiment, the polymer dispersed liquid crystal film is disposed on the side closest to the viewer.

[0023] In one embodiment, the diffractive optical element is adjacent to a first side of a display screen, and the polymer dispersed liquid crystal film is attached to the display screen at a second side of the display screen opposite to the first side.

[0024] In one embodiment, the diffractive optical element is close to a side of the display screen facing away from the light source, and a side of the diffractive optical element away from the display screen is attached to the polymer dispersed liquid crystal film.

[0025] The 2D / 3D switchable display system provided by the present application can quickly realize real-time switching of 2D / 3D display by changing the magnitude of the voltage applied to the polymer dispersed liquid crystal film; and the cost of the polymer dispersed liquid crystal film is not high. Compared with using two display screens, the solution provided by the present application is lower in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings, in which:

[0027] Figure 1 is an exemplary system architecture diagram of a 2D / 3D switchable display system according to an embodiment of the present application;

[0028] Figure 2is an exemplary system architecture diagram of a 2D / 3D switchable display system according to another embodiment of the present application;

[0029] Figure 3 is a 2D / 3D switchable in-vehicle display system according to another embodiment of the present application;

[0030] Figure 4 is what the driver's left and right eyes see during 3D display according to another embodiment of the present application;

[0031] Figure 5 is what the driver's left and right eyes see when displaying in 2D according to another embodiment of the present application;

[0032] Figure 6 is another 2D / 3D switchable vehicle display system according to another embodiment of the present application;

[0033] Figure 7 is a 2D / 3D switchable home theater display system according to another embodiment of the present application;

[0034] Figure 8 is the content seen by the left and right eyes of the audience during 3D display according to another embodiment of the present application;

[0035] Fig. 9 is the content seen by the left and right eyes of the audience during 2D display according to another embodiment of the present application; and

[0036] Fig.10 is a flow chart of a method for manufacturing a 2D / 3D switchable display system according to one embodiment of the present application. DETAILED DESCRIPTION

[0037] In order to better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and do not limit the scope of the present application in any way. Throughout the specification, the same figure numbers refer to the same elements. The expression "and / or" includes any one of the relevant listed items and any combination of any two or more. It is understood that the specific embodiments described herein are only used to explain the relevant inventions, rather than to limit the invention. It should also be noted that, for ease of description, only the parts related to the relevant inventions are shown in the accompanying drawings.

[0038] The features described in this application may be implemented in different forms and should not be construed as being limited to the examples described in this application. Rather, the examples described in this application are provided only to illustrate some of the many possible ways to implement the methods, devices and / or systems described in this application, which will be apparent after understanding the disclosure of this application.

[0039] Use of the word “may” with respect to an example or implementation (eg, with respect to what an example or implementation may include or implement) means that there is at least one example or implementation that includes or implements such feature, while all examples or implementations are not limited thereto.

[0040] It should be noted that in this specification, the expressions first, second, third, etc. are only used to distinguish one feature from another, but do not represent any limitation on the features, and especially do not represent any order of precedence.

[0041] In the drawings, the thickness, size and shape of each component may be slightly exaggerated for convenience of explanation. The drawings are only examples and are not drawn strictly to scale.

[0042] Throughout the specification, when, for example, an element is described as being “on,” “connected to,” or “coupled to” another element, the element may be directly “on,” “connected to,” or “coupled to” the other element, or one or more other elements may be present between the element and the other element. Conversely, when an element is described as being “directly on,” “directly connected to,” or “directly coupled to” another element, other elements may not be present between the element and the other element.

[0043] For ease of description, spatially relative terms such as "above," "higher," "lower," and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "higher" relative to another element will be "below" or "lower" relative to the other element. Therefore, depending on the spatial orientation of the device, the term "above" includes both "above" and "lower" orientations. The device may also be oriented in other ways (e.g., rotated 90 degrees or in other orientations), and the spatially relative terms used herein should be interpreted accordingly.

[0044] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence of one or more other features, elements, components and / or combinations thereof. In addition, when a statement such as "at least one of..." appears after a list of listed features, it modifies all of the features in the list, rather than just the individual elements in the list.

[0045] As used herein, the words "substantially," "approximately," and similar words are used as words of approximation rather than degrees, and are intended to account for the inherent variations in measurements or calculations that one of ordinary skill in the art would recognize.

[0046] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having the same meaning as they have in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense, unless explicitly defined in this article.

[0047] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in this application can be combined with each other. In addition, unless explicitly limited or contradictory to the context, the specific steps included in the method recorded in this application are not necessarily limited to the recorded order, but can be performed in any order or in parallel.

[0048] The 2D / 3D switchable display system according to the embodiment of the present application may include a light source for emitting light carrying image content, and a display screen for displaying the image content, wherein the system further includes: a polymer dispersed liquid crystal film, which is arranged on the side of the display screen facing away from the light source and has a scattering state and a transmission state, so as to present a 2D or 3D display effect for the image content with different viewing angles after passing through the display screen. Figure 1 and attached Figure 2 The exemplary embodiments of the present application will be described in detail.

[0049] Figure 1A 2D / 3D switchable display system 100 according to an embodiment of the present application is shown. As shown in the figure, the 2D / 3D switchable display system 100 may include a light source 10, a diffractive optical element 20, a display screen 30, a polymer dispersed liquid crystal film 40 and a voltage control system 50. The light source 10 may be arranged at the frontmost side of the 2D / 3D switchable display system 100, and may emit light; the diffractive optical element 20 may separate the light emitted by the light source 10 into light of different viewing angles, and the diffractive optical element 20 may be arranged close to the display screen 30, and then the light of different viewing angles carries or displays different image contents after passing through the display screen 30; the display screen 30 may display the light of different viewing angles as image contents of different viewing angles; the polymer dispersed liquid crystal film 40 may pass the image contents of different viewing angles through the polymer dispersed liquid crystal film 40 to form a 3D display effect, or may scatter the image contents of different viewing angles to form a 2D display effect; the voltage control system 50 may control the power-on voltage applied to the polymer dispersed liquid crystal film 40.

[0050] Furthermore, if Figure 1 As shown, in the 2D / 3D switchable display system 100, the diffractive optical element 20 is arranged on the optical path of the light emitted by the light source 10, close to the side of the display screen 30 close to the light source 10, and is used to separate the light emitted by the light source into light of different viewing angles. The display screen 30 receives light of different viewing angles from the diffractive optical element 20, and makes the transmitted light display image content of different viewing angles. Specifically, the light of each viewing angle carries the image content of the corresponding viewing angle. Specifically, the diffractive optical element 20 is close to the first side of the display screen 30, and the polymer dispersed liquid crystal film 40 is attached to the display screen 30 on the second side of the display screen 30 opposite to the first side.

[0051] In an exemplary embodiment, the polymer dispersed liquid crystal film 40 includes an organic solid polymer matrix and liquid crystal droplets dispersed in the organic solid polymer matrix. The size of the liquid crystal droplets is in the order of micrometers.

[0052] Since the liquid crystal is dispersed in the organic solid polymer matrix in the form of micron-sized droplets, and the optical axes of the droplets composed of liquid crystal molecules are in a free orientation, the refractive index of the liquid crystal droplets does not match the refractive index of the organic solid polymer matrix. When light passes through the polymer dispersed liquid crystal film 40, it can be strongly scattered by the liquid crystal droplets, and the polymer dispersed liquid crystal film 40 is in an opaque milky white state or a translucent state.

[0053] Furthermore, when the image contents of different viewing angles displayed by the display screen 30 reach the polymer dispersed liquid crystal film 40, the voltage control system 50 applies different power-on voltages to the polymer dispersed liquid crystal film 40. The following two situations may occur:

[0054] In the first case, when the voltage control system 50 is configured to adjust the power-on voltage, the applied electric field can adjust the optical axis orientation of the droplets of the polymer dispersed liquid crystal film 40, and when the refractive index of the droplets and the organic solid polymer matrix match, the polymer dispersed liquid crystal film 40 can be made transparent. Thus, the image content at different viewing angles can be transmitted through the polymer dispersed liquid crystal film 40 to present a 3D display effect.

[0055] In the second case, when the voltage control system 50 is configured to stop supplying power to the polymer dispersed liquid crystal film 40, that is, the voltage applied to the polymer dispersed liquid crystal film 40 is 0, the liquid crystal droplets of the polymer dispersed liquid crystal film 40 return to their initial light scattering state, that is, the polymer dispersed liquid crystal film 40 has a scattering effect, which can directly scatter image content at different viewing angles, thereby presenting the image content with a 2D display effect.

[0056] Figure 2 A 2D / 3D switchable display system 100' according to another embodiment of the present application is shown. As shown in the figure, the 2D / 3D switchable display system 100' may include a light source 10, a display screen 30, a diffractive optical element 20, a polymer dispersed liquid crystal film 40 and a voltage control system 50. The light source 10 may be arranged at the front of the 2D / 3D switchable display system 100' and may emit light; the display screen 30 may load and display image content and make the light emitted by the light source 10 have the displayed image content; the diffractive optical element 20 may be arranged close to the display screen 30 and may separate the displayed image content into image content of different viewing angles; the polymer dispersed liquid crystal film 40 may pass the image content of different viewing angles through the polymer dispersed liquid crystal film 40 to form a 3D display effect, or may scatter the image content of different viewing angles to form a 2D display effect; the voltage control system 50 may control the power-on voltage applied to the polymer dispersed liquid crystal film 40.

[0057] Furthermore, if Figure 2 As shown, in the 2D / 3D switchable display system 100', the diffractive optical element 20 is disposed close to the side of the display screen 30 facing away from the light source 10, and is used to separate the image content displayed on the display screen 30 into image content of different viewing angles, and project them onto the polymer dispersed liquid crystal film 40. Specifically, the diffractive optical element 20 is close to the side of the display screen 30 facing away from the light source, and the side of the diffractive optical element 20 away from the display screen 30 is attached to the polymer dispersed liquid crystal film 40.

[0058] Since the liquid crystal is dispersed in the organic solid polymer matrix in the form of micron-sized droplets, and the optical axes of the droplets composed of liquid crystal molecules are in a free orientation, the refractive index of the liquid crystal droplets does not match the refractive index of the organic solid polymer matrix. When light passes through the polymer dispersed liquid crystal film 40, it can be strongly scattered by the liquid crystal droplets, and the polymer dispersed liquid crystal film 40 is in an opaque milky white state or a translucent state.

[0059] Furthermore, when the image contents of different viewing angles separated by the diffractive optical element 20 reach the polymer dispersed liquid crystal film 40, different power-on voltages are applied to the polymer dispersed liquid crystal film 40 according to the voltage control system 50. Then the following two situations may occur: First, when the voltage control system 50 is configured to adjust the power-on voltage, the applied electric field may adjust the optical axis orientation of the liquid crystal droplets of the polymer dispersed liquid crystal film 40, and when the refractive index of the liquid crystal droplets and the organic solid polymer matrix of the polymer dispersed liquid crystal film 40 matches, the polymer dispersed liquid crystal film 40 may be made transparent. Thus, the image contents of different viewing angles are transmitted through the polymer dispersed liquid crystal film 40 to present a 3D display effect. Second, when the voltage control system 50 is configured to stop powering the polymer dispersed liquid crystal film 40, that is, the voltage applied to the polymer dispersed liquid crystal film 40 is 0, the liquid crystal droplets of the polymer dispersed liquid crystal film 40 are restored to the initial light scattering state, that is, the polymer dispersed liquid crystal film 40 has a scattering effect, which can directly scatter the image contents of different viewing angles, and then present the image contents with a 2D display effect.

[0060] See also Figure 1 and Figure 2 , comparing the architectural arrangements of the 2D / 3D switchable display system 100 and the 2D / 3D switchable display system 100', it should be understood that when the diffractive optical element 20 is arranged close to the display screen 30 on the side of the display screen 30 close to the light source 10 (such as Figure 1 Specifically, when there is strong light from the outside, if the diffractive optical element 20 is disposed on the side of the display screen 30 away from the light source, that is, closer to the viewer, as shown in FIG. Figure 2 As shown in FIG. 1 , the diffractive optical element 20 will produce a glare effect (rainbow stripes produced by grating diffraction), which interferes with the clarity of the image and affects the normal viewing of the viewer; and if the diffractive optical element 20 is disposed on the side of the display screen 30 close to the light source, that is, disposed on the light path between the light source 10 and the display screen 30, as shown in FIG. Figure 1 As shown, when there is strong light from the outside, the strong light will hit the surface of the display screen 30, but will not hit the diffractive optical element 20. At this time, the image clarity remains unchanged and the viewer can watch normally.

[0061] In some embodiments, the diffractive optical element 20 is disposed on the optical path of the light emitted by the light source 10, close to the side of the display screen 30 close to the light source 10, and is used to separate the light emitted by the light source into light of different viewing angles. The display screen 30 receives the light of different viewing angles from the diffractive optical element 20, and makes the light passing therethrough display image contents of different viewing angles. Specifically, the diffractive optical element 20 is close to a first side of the display screen 30, and the polymer dispersed liquid crystal film 40 is attached to the display screen 30 on a second side of the display screen 30 opposite to the first side.

[0062] In some embodiments, the diffractive optical element 20 is disposed close to the side of the display screen 30 facing away from the light source 10, and is used to separate the image content displayed by the light emitted by the light source after the display screen 30 is loaded into image content of different viewing angles, and project it to the polymer dispersed liquid crystal film 40. Specifically, the diffractive optical element 20 is close to the side of the display screen 30 facing away from the light source, and the side of the diffractive optical element 20 away from the display screen 30 is attached to the polymer dispersed liquid crystal film 40.

[0063] Furthermore, in some embodiments, the voltage control system 50 can be used to control the power supply voltage applied to the polymer dispersed liquid crystal film 40 to change the state of the polymer dispersed liquid crystal film 40 so as to present a 2D or 3D display effect on image content with different viewing angles after passing through the display screen 30.

[0064] In one embodiment, the voltage control system 50 can be configured to adjust the power-on voltage so that the refractive index of the liquid crystal droplets and the matrix of the organic solid polymer matrix match each other. Even if the polymer dispersed liquid crystal film 40 is in a transmissive state, the polymer dispersed liquid crystal film 40 can be made transparent so that image content at different viewing angles can present a 3D display effect after passing through the polymer dispersed liquid crystal film 40.

[0065] In another embodiment, the voltage control system 50 can be configured to stop supplying power to the polymer dispersed liquid crystal film 40. At this time, the polymer dispersed liquid crystal film 40 has a scattering effect, directly scattering image content at different viewing angles to present the image content with a 2D display effect.

[0066] Specifically, in some embodiments, the diffractive optical element 20 may be a pixelated grating, which is composed of a plurality of pixel units, and each pixel unit of the pixelated grating corresponds to a pixel unit of the display screen 30. Each pixel unit of the pixelated grating is composed of a plurality of microstructures, and the shape of the microstructure of each pixel unit is consistent, and the shapes of the microstructures of different pixel units may be the same or different. The microstructure is selected from a rectangular, triangular, multi-step type, etc.

[0067] In an exemplary embodiment, the image content includes shape content and color content. The light source 10 is an array light source, which can be used to emit light with shape content. The display screen 30 can make the light have the color content in the image content. Then, the light emitted by the display screen 30 can display the shape content and the color content.

[0068] In some embodiments, further, the display screen 30 may be LCD, LED, OLED or Mirco-LED, etc.

[0069] Exemplarily, the display screen 30 and the light source 10 can be separately arranged or integrated. Exemplarily, when the display screen 30 is an LCD or a white light LED, it can be separately arranged from the light source 10. The display screen 30 may include pixel units for displaying image content, as well as color filters, polarizers, and the like.

[0070] When the display screen 30 is an RGB LED, although the pixelated light source 10 can emit light in a controlled manner, the RGB LED generally includes a polarizer, so it can be considered that the image content is displayed at the polarizer, that is, still at the display screen 30. Further, the display screen 30 and the light source 10 can be integrally designed as a light-emitting display screen, which emits light carrying image content and irradiates the diffractive optical element 20. In one embodiment, the polymer dispersed liquid crystal film 40 can be disposed on the side closest to the viewer.

[0071] Next we will continue to combine Figures 3 to 9 Some non-limiting specific embodiments of a 2D / 3D switchable display system provided by the present application are introduced in detail.

[0072] According to another embodiment of the present application, Figure 3 As shown, Figure 3 The invention is a 2D / 3D switchable vehicle display system applicable to vehicle instrument panels. The system mainly includes five parts: a light source 10, a display screen 30, a diffractive optical element 20, a polymer dispersed liquid crystal film 40 and a voltage control system 50.

[0073] Specifically, Figure 3As shown, the light source 10 can be arranged at the front side of the system, and can emit light. After the light passes through the display screen 30, it is loaded with display contents of different viewing angles. After the display contents reach the diffractive optical element 20 close to the display screen 30, the diffraction effect of the diffractive optical element 20 is used to separate the display contents of different viewing angles and reach the polymer dispersed liquid crystal film 40. The voltage control system 50 controls the voltage applied to the polymer dispersed liquid crystal film 40, thereby adjusting the state of the polymer dispersed liquid crystal film 40. When the refractive index of the liquid crystal droplets of the polymer dispersed liquid crystal film 40 matches that of the organic solid polymer matrix, the contents of different viewing angles modulated by the diffractive optical element 20 pass through the polymer dispersed liquid crystal film 40, and the left and right eyes of the driver see the contents of different viewing angles, which are fused by the brain to produce a 3D display effect, such as Figure 4 As shown; when the voltage control system 50 stops supplying power to the polymer dispersed liquid crystal film 40, that is, when the voltage applied to the polymer dispersed liquid crystal film 40 is 0, the polymer dispersed liquid crystal film 40 has a scattering effect, directly scattering the contents at different viewing angles, and at this time, the driver's eyes see the same content, forming a 2D display effect, such as Figure 5 Therefore, by adjusting the voltage applied to the polymer dispersed liquid crystal film 40, real-time switching between 2D and 3D display can be achieved.

[0074] Further, in the above embodiment, the diffractive optical element 20 may be a pixelated grating, which is composed of a plurality of pixel units 201, and each pixel unit 201 of the pixelated grating corresponds to a pixel unit 301 of the display screen 30. Each pixel unit 201 of the pixelated grating is composed of a plurality of microstructures, and the shape of the microstructure of each pixel unit 201 is consistent, and the shapes of the microstructures of different pixel units 201 may be the same or different, and the microstructures are selected from rectangular, triangular, multi-step, etc.; the display screen 30 may be LCD, LED, OLED or Mirco-LED, etc.; the polymer dispersed liquid crystal film 40 may be arranged on the side closest to the viewer.

[0075] According to another embodiment of the present application, Figure 6 As shown, Figure 6 It is another 2D / 3D switchable vehicle display system that can be applied to vehicle dashboards. The system mainly includes five parts: a light source 10, a diffractive optical element 20, a display screen 30, a polymer dispersed liquid crystal film 40 and a voltage control system 50.

[0076] Specifically, Figure 6As shown, in this embodiment, the light source 10 can be arranged at the frontmost side of the system and can emit light. The diffractive optical element 20 is arranged close to the display screen 30 on a first side of the display screen 30 close to the light source 10. The polymer dispersed liquid crystal film 40 is attached to the display screen 30 on a second side of the display screen 30 opposite to the first side. The light emitted by the light source 10 first reaches the diffractive optical element 20 to be separated into different viewing angles, and then reaches the display screen 30 to display image contents at different viewing angles. Then, the state of the polymer dispersed liquid crystal film 40 is adjusted by adjusting the voltage of the polymer dispersed liquid crystal film 40. When the refractive index of the liquid crystal droplets of the polymer dispersed liquid crystal film 40 matches the refractive index of the organic solid polymer matrix, the contents at different viewing angles after modulation by the diffractive optical element 20 pass through the polymer dispersed liquid crystal film 40, and the left and right eyes of the driver see contents at different viewing angles, which are fused by the brain to produce a 3D display effect, such as Figure 4 As shown; when the voltage control system 50 stops supplying power to the polymer dispersed liquid crystal film 40, that is, when the voltage applied to the polymer dispersed liquid crystal film 40 is 0, the polymer dispersed liquid crystal film 40 has a scattering effect, directly scattering the contents at different viewing angles, and at this time, the driver's eyes see the same content, forming a 2D display effect, such as Figure 5 Therefore, by adjusting the voltage applied to the polymer dispersed liquid crystal film 40, real-time switching between 2D and 3D display can be achieved.

[0077] Furthermore, it is necessary to understand that Figure 6 In the embodiment shown, the diffractive optical element 20 is disposed close to the display screen 30 and on a side of the display screen 30 close to the light source 10. Figure 3 In the embodiments shown, both embodiments have good working conditions and image quality under normal conditions.

[0078] But for Figure 6 In the embodiment shown, when there is strong light from the outside, the strong light will shine on the surface of the display screen 30, but will not shine on the diffractive optical element 20, thus avoiding the glare effect (rainbow stripes produced by grating diffraction) of the diffractive optical element 20, and the clarity of the image will not be disturbed, so the viewer can watch normally. Different specific implementations can be adapted to different external use environments.

[0079] In addition, in the above embodiment, the diffractive optical element 20 can be a pixelated grating, which is composed of a plurality of pixel units, each pixel unit corresponds to a pixel unit of the display screen 30, each pixel unit is composed of a plurality of microstructures, the shape of the microstructure of each pixel unit is consistent, the shapes of the microstructures of different pixel units can be the same or different, and the microstructure is selected from a rectangle, a triangle, a multi-step type, etc.; the display screen 30 can be an LCD, an LED, an OLED or a Mirco-LED, etc.; the polymer dispersed liquid crystal film 40 can be arranged on the side closest to the viewer.

[0080] In another embodiment, Figure 7 As shown, Figure 7 According to another embodiment of the present application, a 2D / 3D switchable home theater display system is provided. The system may mainly include five parts: a light source 10, a display screen 30, a diffractive optical element 20, a polymer dispersed liquid crystal film 40 and a voltage control system 50.

[0081] Specifically, Figure 7 As shown, in the system, the light source 10 arranged at the front side can emit light. The light emitted by the light source 10 reaches the diffractive optical element 20 close to the display screen 30 and is separated into light of different viewing angles. The light of different viewing angles is loaded with display contents of different viewing angles after passing through the display screen 30. The voltage control system 50 controls the voltage applied to the polymer dispersed liquid crystal film 40, and then adjusts the state of the polymer dispersed liquid crystal film 40. When the refractive index of the liquid crystal droplets of the polymer dispersed liquid crystal film 40 matches that of the organic solid polymer matrix, the polymer dispersed liquid crystal film 40 is in a transparent state, i.e., a transmission state. Contents of different viewing angles pass through the polymer dispersed liquid crystal film 40, and the left and right eyes of the audience see contents of different viewing angles, which are fused by the brain to produce a 3D display effect, such as Figure 8 As shown, viewers at different positions can see different 3D display contents or the same 3D display contents; when the voltage control system 50 stops energizing the polymer dispersed liquid crystal film 40, that is, when the voltage applied to the polymer dispersed liquid crystal film 40 is 0, the polymer dispersed liquid crystal film 40 has a scattering effect, directly scattering image contents at different viewing angles, and at this time, both eyes of viewers at different positions see the same content, forming a 2D display, such as Fig. 9 Therefore, by adjusting the voltage applied to the polymer dispersed liquid crystal film 40 through the voltage control system 50, real-time switching between 2D and 3D display can be achieved.

[0082] Furthermore, it is understandable that Figure 7 In the 2D / 3D switchable display system shown, the diffractive optical element 20 can also be arranged close to the display screen 30 on the side of the display screen 30 away from the light source 10, that is, the light emitted by the light source 10 is first projected onto the display screen 30, and the image content displayed on the display screen 30 is loaded, and then reaches the diffractive optical element 20 to separate the image into different viewing angles, and then the image content at different viewing angles is presented in 2D or 3D display effect through the polymer dispersed liquid crystal film 40. The process of adjusting the power-on voltage applied to the polymer dispersed liquid crystal film 40 by the voltage control system 50 is the same as that described in the previous embodiment, and will not be repeated here.

[0083] Further, in Figure 7In the illustrated embodiment, the diffractive optical element 20 may be a pixelated grating, which is composed of a plurality of pixel units, each pixel unit corresponding to a pixel unit of the display screen 30, each pixel unit being composed of a plurality of microstructures, the microstructure of each pixel unit having a consistent shape, and the microstructure shapes of different pixel units may be the same or different, and the microstructure is selected from a rectangular, triangular, multi-step type, etc.; the display screen 30 may be an LCD, an LED, an OLED, or a Mirco-LED, etc.; the polymer dispersed liquid crystal film 40 may be disposed on the side closest to the viewer.

[0084] Another aspect of the present application also provides a method for manufacturing a 2D / 3D switchable display system, such as Fig.10 As shown, the method 1000 for manufacturing a 2D / 3D switchable display system may mainly include the following three steps:

[0085] S1, setting a light source for emitting light;

[0086] S2, arranging a display screen for displaying image content on the optical path of the light; and

[0087] S3, a polymer dispersed liquid crystal film having a scattering state and a transmission state is arranged on the side of the display screen facing away from the light source, so as to present a 2D or 3D display effect of image contents at different viewing angles in the light passing through the display screen.

[0088] In one embodiment, a method for manufacturing a 2D / 3D switchable display system provided by the present application may also include: setting a diffractive optical element on the optical path of the light emitted by the light source, for separating the light emitted by the light source into light of different perspectives, wherein the display screen receives the light of different perspectives from the diffractive optical element so that the light of different perspectives displays image content of different perspectives.

[0089] In another embodiment, a method for manufacturing a 2D / 3D switchable display system provided by the present application may also include: setting a diffractive optical element on the side of the display screen facing away from the light source, so as to separate the image content displayed on the display screen into image content of different viewing angles, and projecting it onto the polymer dispersed liquid crystal film.

[0090] Furthermore, in one embodiment, a method for manufacturing a 2D / 3D switchable display system provided by the present application may also include: providing an electrically conductive voltage control system for the polymer dispersed liquid crystal film, for controlling the power-on voltage applied to the polymer dispersed liquid crystal film to change the state of the polymer dispersed liquid crystal film, thereby presenting a 2D or 3D display effect on image content at different viewing angles through the display screen.

[0091] Specifically, in one embodiment, the voltage control system is configured to adjust the power-on voltage to put the polymer dispersed liquid crystal film in a transmissive state, so that image contents at different viewing angles can present a 3D display effect after passing through the polymer dispersed liquid crystal film.

[0092] Specifically, in another embodiment, when the voltage control system stops supplying power to the polymer dispersed liquid crystal film, the polymer dispersed liquid crystal film is in a scattering state and directly scatters image contents at different viewing angles to present the image contents with a 2D display effect.

[0093] In one embodiment, the polymer dispersed liquid crystal film is disposed on the side closest to the viewer.

[0094] In one embodiment, the diffractive optical element is adjacent to a first side of the display screen, and the polymer dispersed liquid crystal film is attached to the display screen at a second side of the display screen opposite to the first side.

[0095] In one embodiment, the diffractive optical element is close to a side of the display screen facing away from the light source, and a side of the diffractive optical element away from the display screen is attached to the polymer dispersed liquid crystal film.

[0096] In summary of the above embodiments, the present application provides a 2D / 3D switchable display system and a manufacturing method thereof, which can quickly realize real-time switching of 2D / 3D display by changing the magnitude of the voltage applied to the polymer dispersed liquid crystal film; and the cost of the polymer dispersed liquid crystal film is not high. Compared with using two display screens, the solution provided by the present application is lower in cost.

[0097] Finally, the above description is only an implementation method of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of protection involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the technical concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A 2D / 3D switchable display system, comprising a light source for emitting light, and a display screen for displaying image content, characterized in that: The light source is a pixelated light source, used to emit light carrying shape content; the display screen is arranged on the optical path of the light, used to make the transmitted light display the image content; The system further comprises: a diffractive optical element, arranged on a side of the display screen facing away from the light source, for separating the image content displayed on the display screen into image content of different viewing angles and projecting the image content onto the polymer dispersed liquid crystal film, wherein the diffractive optical element is a pixelated grating; The polymer dispersed liquid crystal film is disposed on a side of the display screen facing away from the light source and has a scattering state and a transmission state, so as to present the image contents at different viewing angles with a 2D or 3D display effect; and A voltage control system controls the power-on voltage applied to the polymer dispersed liquid crystal film to change the state of the polymer dispersed liquid crystal film; wherein the voltage control system is configured to adjust the power-on voltage to put the polymer dispersed liquid crystal film in a transmission state, or is configured to stop applying power to the polymer dispersed liquid crystal film to put the polymer dispersed liquid crystal film in a scattering state; When the polymer dispersed liquid crystal film is in a transmission state, the image contents at different viewing angles pass through the polymer dispersed liquid crystal film, so that the viewer's eyes see the contents at different viewing angles, which are fused by the brain to produce a 3D display effect; when the polymer dispersed liquid crystal film is in a scattering state, the image contents at different viewing angles are directly scattered, so that the viewer's eyes see the same content, forming a 2D display effect.

2. The system according to claim 1, characterized in that The polymer dispersed liquid crystal film comprises: an organic solid polymer matrix; and a plurality of liquid crystal droplets dispersed in the organic solid polymer matrix; Wherein, when there is no external electric field, the optical axes of at least a portion of the liquid crystal droplets are not parallel to each other.

3. The system according to claim 1 or 2, characterized in that: The polymer dispersed liquid crystal film is arranged on the side closest to the viewer.

4. The system according to claim 1, characterized in that The diffractive optical element is close to the side of the display screen facing away from the light source, and the side of the diffractive optical element away from the display screen is attached to the polymer dispersed liquid crystal film.

5. The system according to claim 1, characterized in that The display screen is LCD, LED, OLED or Mirco-LED.

6. A method for manufacturing a 2D / 3D switchable display system, characterized in that: The method comprises: A light source is provided for emitting light; wherein the light source is a pixelated light source, and is used for emitting light carrying shape content; A display screen for displaying image content is arranged on the optical path of the light, and the light passes through the display screen to display the image content; A diffractive optical element is arranged on a side of the display screen facing away from the light source, so as to separate the image content displayed on the display screen into image content of different viewing angles and project the image content onto the polymer dispersed liquid crystal film, wherein the diffractive optical element is a pixelated grating; and The polymer dispersed liquid crystal film having a scattering state and a transmission state is arranged on a side of the display screen facing away from the light source, so as to present the image contents at different viewing angles with a 2D or 3D display effect; and A voltage control system providing electrical conduction for the polymer dispersed liquid crystal film, used for controlling the power-on voltage applied to the polymer dispersed liquid crystal film to change the state of the polymer dispersed liquid crystal film; The voltage control system is configured to adjust the power-on voltage to put the polymer dispersed liquid crystal film in a transmission state, or is configured to stop powering the polymer dispersed liquid crystal film to put the polymer dispersed liquid crystal film in a scattering state; When the polymer dispersed liquid crystal film is in a transmission state, the image contents at different viewing angles pass through the polymer dispersed liquid crystal film, so that the viewer's eyes see the contents at different viewing angles, which are fused by the brain to produce a 3D display effect; when the polymer dispersed liquid crystal film is in a scattering state, the image contents at different viewing angles are directly scattered, so that the viewer's eyes see the same content, forming a 2D display effect.

7. The method according to claim 6, characterized in that The polymer dispersed liquid crystal film is arranged on the side closest to the viewer.

8. The method according to claim 6, characterized in that The diffractive optical element is close to the side of the display screen facing away from the light source, and the side of the diffractive optical element away from the display screen is attached to the polymer dispersed liquid crystal film.

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