A real image and virtual image composite display system based on phase modulation

Abstract

The utility model relates to a real image virtual image composite display system based on phase modulation, including parallelly arranged real image display module and virtual image display module, and real image display module and virtual image display module realize light path coupling through common transparent optical element, application the mode method of this application, real image display module and virtual image display module realize light path coupling through common transparent optical element, not only can the component very little that can be related be very little, and can good realization near field real image and far field virtual image's combination display, still greatly reduced the volume of whole, promoted its applicability.

Description

Technical Field

[0001] This utility model relates to the field of real-image and virtual-image composite display technology, and more specifically, to a real-image and virtual-image composite display system based on phase modulation. Background Technology

[0002] Real-image and virtual-image composite display technology has broad application prospects in fields such as intelligent car cockpit display, AR cultural tourism experience, holographic interactive system, microscopic imaging equipment, and mixed reality education and popular science. Taking the head-up display (HUD) of intelligent car cockpit display as an example: HUD is a technology that projects driving information to the driver's field of vision through optical reflection. Its core goal is to reduce the frequency of drivers looking down at the instrument panel and improve driving safety. Common display information includes vehicle speed, navigation guidance, fuel / battery status, and driver assistance system warnings. Currently, the images formed by head-up displays are usually single virtual or single real images. There is no solution that can combine virtual and real images. In the surrounding fields, although there are solutions that combine virtual and real images, these solutions all require relatively complex optical structures or AR devices. They are not only costly, but also limited by spatial and other scene factors, and cannot be applied to head-up display-related products. There is a need for a phase modulation-based real-virtual image composite display system that can solve this problem. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a real-image and virtual-image composite display system based on phase modulation, and a real-image and virtual-image composite display method based on phase modulation, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this utility model to solve its technical problem is: A phase modulation-based real-image and virtual-image composite display system is constructed, comprising a real-image display module and a virtual-image display module arranged in parallel, wherein the real-image display module and the virtual-image display module achieve optical path coupling through a shared transparent optical element.

[0005] The phase modulation-based real-image and virtual-image composite display system of this utility model comprises a real-image display module consisting of a real-image generating unit and a real-image display film, and a virtual-image display module consisting of a virtual-image generating unit and a virtual-image display film; both the real-image display film and the virtual-image display film are attached to the transparent optical element.

[0006] The phase modulation-based real-image and virtual-image composite display system of this utility model includes a real-image phase modulation layer, a real-image partial reflection layer, and a real-image phase compensation layer arranged sequentially along the optical path direction.

[0007] The present invention relates to a phase modulation-based real-image and virtual-image composite display system, wherein the real-image phase modulation layer is a multi-layer holographic structure or a Fresnel lens; the surface shape of the Fresnel lens is spherical, aspherical, freeform, or holographic.

[0008] The present invention relates to a phase modulation-based real-image and virtual-image composite display system, wherein the virtual image display film comprises a virtual image phase modulation layer, a virtual image partial reflection layer, and a virtual image phase compensation layer.

[0009] The present invention relates to a phase modulation-based real-image and virtual-image composite display system, wherein the virtual image phase modulation layer is a multi-layer holographic structure or a Fresnel lens; the surface shape of the Fresnel lens is spherical, aspherical, freeform, or holographic. The phase modulation-based real-image and virtual-image composite display system of this utility model comprises, wherein the real-image display film, the virtual-image display film, and the transparent optical element are sequentially bonded together, or the virtual-image display film, the real-image display film, and the transparent optical element are sequentially bonded together, or a sandwich layer is provided within the transparent optical element, and both the real-image display film and the virtual-image display film are disposed within the sandwich layer; the real-image generating unit and the virtual-image generating unit are both disposed on the side of the transparent optical element near the real-image display film.

[0010] The phase modulation-based real-image and virtual-image composite display system of this utility model includes a real image generating unit that is a projection device and a virtual image generating unit that is a display device, or a virtual image generating unit that is composed of a projection device and a scattering film.

[0011] The phase modulation-based real-image and virtual-image composite display system of this invention includes a transparent optical element made of glass or PC.

[0012] A phase-modulation-based real-image / virtual-image composite display method, according to the aforementioned phase-modulation-based real-image / virtual-image composite display system, wherein the method includes: When light emitted from the real image generation unit passes through the real image phase modulation layer of the real image display film, the real image partial reflection layer reflects and scatters part of the light back to the observer, forming a real image. The direction and outline of the reflected light are determined by the phase modulation layer structure. When the other part of the light passes through the real image phase modulation layer and the real image phase compensation layer, its phase modulation is compensated and it passes through the transparent optical element to achieve transparent display. The light emitted by the virtual image generation unit is partially reflected into the virtual image phase modulation layer after passing through the virtual image partial reflection layer. The virtual image phase modulation layer performs specific control on the light of the microdisplay, so that the light forms an enlarged virtual image at a distance, forming a virtual image picture. At the same time, the virtual image phase modulation layer works in conjunction with the virtual image phase compensation layer to cancel the optical path change introduced by the modulation layer through reverse phase adjustment, ensuring that the transmission of light incident on the transparent optical element from the outside is not affected.

[0013] The beneficial effects of this utility model are as follows: by applying the method of this application, the real image display module and the virtual image display module achieve optical path coupling through a shared transparent optical element, which not only involves very few components, but also can effectively achieve the combined display of near-field real image and far-field virtual image, while greatly reducing the overall size and improving its applicability. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the utility model will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Figure 1 This is a schematic diagram of the optical path structure of a phase-modulated real-image and virtual-image composite display system according to a preferred embodiment of the present invention. Figure 2 This is a schematic diagram of a preferred embodiment of the phase modulation-based real-image and virtual-image composite display system of this utility model, illustrating a usage scenario. Figure 3 This is a schematic diagram of the optical path structure of a phase-modulated real-image and virtual-image composite display system according to another preferred embodiment of the present invention. Figure 4 This is a flowchart of a phase modulation-based real-virtual-image composite display method according to a preferred embodiment of the present invention. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0016] Example 1 The preferred embodiment of this utility model is a phase-modulated real-virtual-image composite display system, such as... Figure 1 As shown, see also Figure 2 and Figure 3 It includes a real image display module and a virtual image display module arranged in parallel, and the real image display module and the virtual image display module achieve optical path coupling through a shared transparent optical element; By applying the method of this application, the real image display module and the virtual image display module achieve optical path coupling through a shared transparent optical element. This not only involves very few components, but also enables the combined display of near-field real images and far-field virtual images, while greatly reducing the overall size and improving its applicability. This solution achieves low-cost, small-volume virtual and real image compositing, significantly reducing the cost while minimizing device size, making it highly flexible in application. It is suitable not only for small-space display scenarios such as smart car cockpit displays and microscopic imaging equipment, but also for large-space display scenarios such as AR cultural tourism experiences, holographic interactive systems, and mixed reality education and popular science. Of course, it can also be applied to any other scenario that requires projection display.

[0017] It should be noted that, Figures 1-3 As shown, 1 represents the observer's position, 7 represents the position of the real image, 8 represents the position of the virtual image, and 10 represents the external environment. Preferably, the real image display module consists of a real image generating unit 3 and a real image display film 4, and the virtual image display module consists of a virtual image generating unit 2 and a virtual image display film 5; both the real image display film and the virtual image display film are attached to the transparent optical element 6; the real image generating unit 3 can be a projection device, such as a projector; the virtual image generating unit 2 can be a display device, such as a (micro) display, a micro display chip, etc., wherein the micro display chip can be one of the following micro display technologies: LCOS, LCD, DLP, OLED, LED, Micro LED; the transparent optical element can be made of glass or PC material.

[0018] A preferred implementation scenario: Transparent optical elements can be integrated into the car's windshield. A micro-display and projector are placed under the car's dashboard. This system utilizes the space between the windshield and the dashboard, significantly reducing the size of the head-up display and enabling both near-field real-image display and far-field virtual-image display.

[0019] It should be noted that the above scenario is only an example to illustrate the advantages of head-up display in terms of space, display performance, and cost when combining virtual and real images. It can also be applied to other head-up display scenarios without limiting the specific scenario. The solutions obtained by simply applying the above solution to different head-up display scenarios also fall within the scope of protection of this application.

[0020] More specifically, the optical principles are explained below: The real image display film 4 includes a real image phase modulation layer, a real image partial reflection layer, and a real image phase compensation layer arranged sequentially along the optical path. When the light emitted by the real image generation unit 3 passes through the real image phase modulation layer of the real image display film 4, the real image partial reflection layer reflects and scatters part of the light back to the observer, forming a real image. The direction and outline of the reflected light are determined by the phase modulation layer structure. When the other part of the light passes through the real image phase modulation layer and the real image phase compensation layer, its phase modulation is compensated and it passes through the transparent optical element 6 to achieve transparent display.

[0021] The real image phase modulation layer is a multi-layer holographic structure or a Fresnel lens. If a Fresnel lens is used, the surface shape of the Fresnel lens can be spherical, aspherical, freeform, or holographic, and there are no restrictions on this.

[0022] The virtual image display film 5 includes a virtual image phase modulation layer, a virtual image partial reflection layer, and a virtual image phase compensation layer. When the light emitted by the virtual image generation unit 2 passes through the virtual image phase modulation layer of the virtual image display film 5, the virtual image phase modulation layer performs specific control on the light of the microdisplay, so that the light forms an enlarged virtual image at a distance, thus forming a virtual image picture.

[0023] The virtual image phase modulation layer is a multi-layer holographic structure or a Fresnel lens; if a Fresnel lens is used, the surface shape of the Fresnel lens can be spherical, aspherical, freeform, or holographic, and there are no restrictions on this. Preferably, the real image display film 4, the virtual image display film 5, and the transparent optical element 6 are sequentially bonded together, or the virtual image display film, the real image display film, and the transparent optical element are sequentially bonded together, or a sandwich layer is provided inside the transparent optical element, and both the real image display film and the virtual image display film are disposed in the sandwich layer; the real image generating unit 3 and the virtual image generating unit 2 are both disposed on the side of the transparent optical element close to the real image display film. Example 2 Another preferred embodiment of this application, such as Figure 3 As shown, this embodiment is basically the same as Embodiment 1, and the similarities will not be repeated. The differences are as follows: The virtual image generating unit consists of a projection device 20 (such as a projector) and a scattering film 21. This combination can also form a virtual image and implement the present solution. Of course, it is understood that it can be replaced with other existing virtual image generating methods, and this is not limited. Solutions obtained by simply replacing conventional virtual image generating methods also fall within the scope of this application. Similarly, the real image generating unit can also be replaced with other existing real image generating methods, and this is not limited. Solutions obtained by simply replacing conventional real image generating methods also fall within the scope of this application.

[0024] Example 3 A phase modulation-based real-image / virtual-image composite display method, based on the aforementioned phase modulation-based real-image / virtual-image composite display system, such as... Figure 4 As shown, the method includes: S01: When the light emitted by the real image generation unit passes through the real image phase modulation layer of the real image display film, the real image partial reflection layer reflects and scatters part of the light back to the observer, forming a real image. The direction and outline of the reflected light are determined by the phase modulation layer structure. When the other part of the light passes through the real image phase modulation layer and the real image phase compensation layer, its phase modulation is compensated and it passes through the transparent optical element to achieve transparent display. S02: The light emitted by the virtual image generation unit is partially reflected into the virtual image phase modulation layer after passing through the virtual image partial reflection layer. The virtual image phase modulation layer performs specific control on the light of the microdisplay, so that the light forms a magnified virtual image at a distance, forming a virtual image picture. At the same time, the virtual image phase modulation layer works with the virtual image phase compensation layer to cancel the optical path change introduced by the modulation layer through reverse phase adjustment, ensuring that the transmission of light entering the transparent optical element from the outside is not affected. By applying the method of this application, the real image display module and the virtual image display module achieve optical path coupling through a shared transparent optical element. This not only involves very few components, but also enables the combined display of near-field real images and far-field virtual images, while greatly reducing the overall size and improving its applicability.

[0025] It should be noted that S01 and S02 mentioned above are not in any particular order and are performed simultaneously.

[0026] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A phase modulation-based real-image / virtual-image composite display system, characterized in that, It includes a real image display module and a virtual image display module arranged in parallel, wherein the real image display module and the virtual image display module achieve optical path coupling through a shared transparent optical element.

2. The phase modulation-based real-image / virtual-image composite display system according to claim 1, characterized in that, The real image display module consists of a real image generating unit and a real image display film, and the virtual image display module consists of a virtual image generating unit and a virtual image display film; both the real image display film and the virtual image display film are attached to the transparent optical element.

3. The phase modulation-based real-image / virtual-image composite display system according to claim 2, characterized in that, The real image display film includes a real image phase modulation layer, a real image partial reflection layer, and a real image phase compensation layer arranged sequentially along the optical path.

4. The phase modulation-based real-image / virtual-image composite display system according to claim 3, characterized in that, The real image phase modulation layer is a multi-layer holographic structure or a Fresnel lens; the surface of the Fresnel lens is spherical, aspherical, freeform, or a hologram.

5. The phase modulation-based real-image / virtual-image composite display system according to claim 2, characterized in that, The virtual image display film includes a virtual image phase modulation layer, a virtual image partial reflection layer, and a virtual image phase compensation layer.

6. The phase modulation-based real-image / virtual-image composite display system according to claim 5, characterized in that, The virtual image phase modulation layer is a multi-layer holographic structure or a Fresnel lens; the surface of the Fresnel lens is spherical, aspherical, freeform, or holographic.

7. The phase modulation-based real-image / virtual-image composite display system according to claim 2, characterized in that, The real image display film, the virtual image display film, and the transparent optical element are sequentially bonded together, or the virtual image display film, the real image display film, and the transparent optical element are sequentially bonded together, or a sandwich layer is provided inside the transparent optical element, and the real image display film and the virtual image display film are both disposed in the sandwich layer; the real image generating unit and the virtual image generating unit are both disposed on the side of the transparent optical element near the real image display film.

8. The phase modulation-based real-image / virtual-image composite display system according to any one of claims 2-7, characterized in that, The real image generating unit is a projection device; the virtual image generating unit is a display device, or the virtual image generating unit is composed of a projection device and a scattering film.

9. The phase modulation-based real-image / virtual-image composite display system according to claim 1, characterized in that, The transparent optical element is made of glass or PC.

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