Image adjustment device and display system

Abstract

The present invention provides an image adjustment device and a display system, which are applied in the field of display technology. The image adjustment device includes a light modulation module, which is configured to receive the output light of each frame of an image displayed by a display panel, and convert the output light of each frame of an image into at least two groups of image lights with different image distances; an optical waveguide element, which is configured to receive at least two groups of image lights and transmit each group of image lights along a preset path; and a light extraction component, which is arranged on the light output side of the optical waveguide element and is configured to transmit each group of image lights output by the optical waveguide element to different imaging surfaces. By adopting the device, the output light of the image displayed by the display panel is converted into at least two groups of image lights with different image distances, and the images are displayed on different imaging surfaces, respectively. This can solve the problem in the prior art of near-eye display technology that the focal length of the display screen is fixed, and when watching the displayed image, the focus is focused on the same image plane for a long time, which is easy to cause fatigue and dizziness.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to an image adjustment device and a display system. Background Art

[0002] Near-eye display is a current research hotspot. It can provide people with an unprecedented sense of interactivity and has important application value in many fields such as telemedicine, industrial design, education, military virtual training, and entertainment.

[0003] Virtual Reality (VR) technology presents a fully enclosed virtual environment, and Augmented Reality (AR) technology is an enhanced projection method that superimposes virtual scenes on the real environment. These two popular display methods have entered the public's field of vision and have begun to be widely used.

[0004] The VR / AR display devices currently on the market have a fixed focal length for the display screen. When the human eye views the display screen, the eye focuses on the same image plane for a long time, which conflicts with the brain's regulation of the optic nerve. When the human eye continues to view such a display screen for too long, fatigue and dizziness will occur, resulting in a convergence conflict. Summary of the invention

[0005] The technical solution of the present invention aims to provide an image adjustment device and a display system, which are used to solve the problem in the prior art of near-eye display technology that the focal length of the display screen is fixed, and when watching the display screen, the focus is on the same image plane for a long time, which is easy to cause fatigue and dizziness.

[0006] An embodiment of the present invention provides an image adjustment device, comprising:

[0007] The light modulation module is configured to receive the output light of each frame of image displayed by the display panel, and convert the output light of each frame of image into at least two groups of image lights with different image distances;

[0008] an optical waveguide element, configured to receive at least two groups of the image light and transmit each group of the image light along a preset path;

[0009] The light extraction component is disposed on the light output side of the optical waveguide element and is configured to transmit each group of the image light output by the optical waveguide element to different imaging surfaces respectively.

[0010] Optionally, in the image adjustment device, the light modulation module is configured to convert the output light of the corresponding frame image into at least two groups of image lights with different image distances in a time-sharing manner within a display period of each frame image displayed by the display panel.

[0011] Optionally, in the image adjustment device, the light modulation module comprises:

[0012] A light separation element, used for separating the output light of each frame of image to obtain at least two groups of separated light of the output light;

[0013] The image distance adjusting element is used to adjust the image distances of at least two groups of separated light rays respectively, so as to obtain at least two groups of image light rays with different image distances.

[0014] Optionally, in the image adjustment device, the light separation element includes a spatial light modulator, and two groups of separated light beams of the output light are obtained by converting the output light into P-polarized light and S-polarized light.

[0015] Optionally, in the image adjustment device, the image distance adjustment element includes a zoom lens, the P-polarized light and the S-polarized light pass through the zoom lens, and the zoom lens obtains two groups of image lights with different image distances by focusing the P-polarized light and the S-polarized light to different degrees.

[0016] Optionally, in the image adjustment device, the light separation element includes a wavelength converter, and at least two groups of separated light beams of the output light are obtained by converting the output light into light beams of different wavelengths.

[0017] Optionally, in the image adjustment device, the image distance adjustment element includes a metasurface lens, and the metasurface lens obtains at least two groups of image lights with different image distances by performing different phase adjustments on separated lights of different wavelengths.

[0018] Optionally, the image adjustment device further comprises:

[0019] The reflective element is used to receive the image light output by the light modulation module and reflect the image light into the optical waveguide element.

[0020] Optionally, in the image adjustment device, the light extraction component includes an outcoupling grating.

[0021] Optionally, the image adjustment device further comprises an in-coupling grating disposed at a light incident end of the optical waveguide element.

[0022] An embodiment of the present invention further provides a display system, including a display panel, and further including an image adjustment device as described in any one of the above items.

[0023] At least one of the above technical solutions in the specific embodiment of the present invention has the following beneficial effects:

[0024] By using the image adjustment device described in the embodiment of the present invention, the output light of the image displayed by the display panel is converted into at least two groups of image lights with different image distances, and the images are displayed on different imaging planes respectively. In this way, when the image is viewed using the display system, through the adjustment of the human eye, when the image on one of the imaging planes is clearly observed, the images on the other imaging planes are blurred, which is consistent with the feeling of viewing a three-dimensional physical scene, so as to avoid focusing on the same image plane for a long time, causing fatigue and dizziness, and to eliminate convergence conflict. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the image adjustment device according to an embodiment of the present invention;

[0026] Figure 2 Schematic diagram of transmission light of zoom lens;

[0027] Figure 3 Schematic diagram of the transmission light of the metasurface lens;

[0028] Figure 4 It is a schematic diagram of image fusion using the image adjustment device described in an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0030] In order to solve the problem in the prior art of near-eye display technology that the focal length of the display screen is fixed, and when watching the displayed screen, the user is focused on the same image plane for a long time, which easily causes fatigue and dizziness, an embodiment of the present invention provides an image adjustment device. By means of the image adjustment device, the output light of the image displayed by the display panel is converted into at least two groups of image lights with different image distances, and the images are displayed on different imaging planes respectively, so as to avoid focusing on the same image plane for a long time, which causes fatigue and dizziness.

[0031] The image adjustment device according to the embodiment of the present invention, in one implementation manner, is as follows Figure 1 As shown, the image adjustment device includes:

[0032] The light modulation module 100 is configured to receive the output light of each frame of image displayed by the display panel 400, and convert the output light of each frame of image into at least two groups of image lights with different image distances;

[0033] The optical waveguide element 200 is configured to receive at least two groups of the image light and transmit each group of the image light along a preset path;

[0034] The light extraction component 300 is disposed on the light output side of the optical waveguide element 200 and is configured to transmit each group of image light output by the optical waveguide element 200 to different imaging surfaces.

[0035] When the image adjustment device described in the embodiment of the present invention is arranged on the light-emitting side of the display panel, it can display images on different imaging planes respectively, forming a display system with at least two focal planes. In this way, when viewing images using the display system, through the adjustment of the human eye, when the image on one of the imaging planes is clearly observed, the images on the other imaging planes are in a blurred state, which is consistent with the feeling of viewing a three-dimensional physical scene, so as to avoid focusing on the same image plane for a long time, causing fatigue and dizziness, and to eliminate convergence conflict.

[0036] In the embodiment of the present invention, optionally, the light modulation module 100 is configured to convert the output light of the corresponding frame image into at least two groups of image lights with different image distances in a time-sharing manner within a display period of each frame image displayed by the display panel 400.

[0037] With this implementation, when the display panel 400 displays an image at a preset refresh rate, within each display period of displaying one frame of the image, the light modulation module 100 time-dividedly converts the output light of the corresponding frame of the image into at least two groups of image lights with different image distances, so as to display the image on different imaging planes through the at least two groups of image lights with different image distances, thereby ensuring that the user can view the same displayed image on imaging planes with different image distances.

[0038] In an embodiment of the present invention, optionally, the light modulation module includes:

[0039] A light separation element, used for separating the output light of each frame of image to obtain at least two groups of separated light of the output light;

[0040] The image distance adjusting element is used to adjust the image distances of at least two groups of separated light rays respectively, so as to obtain at least two groups of image light rays with different image distances.

[0041] Alternatively, if Figure 1 As shown, the image adjustment device also includes:

[0042] The reflective element 500 is used to receive the image light output by the light modulation module 100 and reflect the image light into the optical waveguide element 200 .

[0043] Optionally, the reflective element 500 is disposed between the light modulation module 100 and the optical waveguide element 200 to reflect light toward the optical waveguide element 200 so that the image light output by the light modulation module 100 can be transmitted into the optical waveguide element 200 after being reflected by the reflective element 500 .

[0044] In one embodiment of the present invention, optionally, in the light modulation module 100, the light separation element includes a spatial light modulator, and the two groups of separated light beams of the output light beam are obtained by converting the output light beam into P polarized light and S polarized light;

[0045] In addition, optionally, the image distance adjusting element includes a zoom lens, the P-polarized light and the S-polarized light pass through the zoom lens, and the zoom lens obtains two groups of image lights with different image distances by focusing the P-polarized light and the S-polarized light to different degrees.

[0046] In this embodiment, a spatial light adjuster is used to convert the output light of the display panel into P-polarized light and S-polarized light in a time-sharing manner, thereby realizing separation of the output light. In addition, the zoom lens has the characteristic of having different focusing capabilities for P-polarized light and S-polarized light, and the two groups of separated light rays passing through the zoom lens are focused to different degrees after passing through the zoom lens, thereby obtaining two groups of image light rays with different image distances.

[0047] Optionally, the spatial light modulator can modulate the amplitude of the light field using a liquid crystal light valve, modulate the phase by the refractive index, modulate the polarization state by rotating the polarization plane, or realize the conversion of incoherent to coherent light, thereby converting the output light of the display panel into P-polarized light and S-polarized light.

[0048] Optionally, the zoom lens is a polarization zoom lens, which has different deflection capabilities for P-polarized light and S-polarized light, such as Figure 2 As shown (the dotted line represents the polarization state of P-polarized light after passing through the zoom lens, and the dotted line represents the polarization state of S-polarized light after passing through the zoom lens), different degrees of focusing of P-polarized light and S-polarized light are achieved, so that the separated light rays passing through the zoom lens have different image distances.

[0049] In another implementation manner of the embodiment of the present invention, optionally, the light separation element includes a wavelength converter, and at least two groups of separated light beams of the output light beam are obtained by converting the output light beam into light beams of different wavelengths.

[0050] In addition, optionally, the image distance adjustment element includes a metasurface lens, and the metasurface lens obtains at least two groups of image lights with different image distances by performing different phase adjustments on separated lights of different wavelengths.

[0051] By adopting this implementation, a wavelength converter is used to convert the output light of the display panel into light of different wavelengths in a time-sharing manner, and then the metasurface lens is used to have different focusing capabilities for light of different wavelengths, so that the light passing through the metasurface lens is focused to different degrees and has different image distances.

[0052] It should be noted that the metasurface lens includes a plurality of lens units arranged periodically in a grid distribution, including a substrate material and a dielectric material, and can be used as a geometric lens for phase control, that is, it can control the optical path, such as Figure 3 As shown, focusing is achieved. In addition, the advantage of metasurface lenses is that they can achieve high-precision control, have no aberrations of geometric lenses, are highly dependent on wavelength, and structures with different wavelengths will have different phase modulation capabilities.

[0053] In this embodiment, the characteristic of the metasurface lens that it has different phase modulation capabilities for light of different wavelengths is utilized, so that the light passing through the metasurface lens is focused to different degrees and has different image distances.

[0054] In the embodiment of the present invention, optionally, the image adjustment device further includes a coupling grating 600 disposed at the light incident end of the optical waveguide element 200 , and transmits the image light reflected by the reflective element 500 to the interior of the optical waveguide element 200 through the coupling grating 600 .

[0055] Optionally, in an embodiment of the present invention, the light extraction component 300 includes an outcoupling grating, which is disposed at the light emitting end of the optical waveguide element 200, and is used to receive image light emitted from the light emitting end of the waveguide element 200, and transmit the image light to the imaging surface. Different groups of image light are transmitted to different imaging surfaces respectively.

[0056] Optionally, the imaging surface position may be a human eye position or a CCD camera position.

[0057] In the embodiment of the present invention, optionally, the optical waveguide element 200 may be any one of a diffraction waveguide and an array waveguide, and is used to transmit image light with different image distances along a preset path.

[0058] like Figure 1 As shown, optionally, inside the optical waveguide component 200, among the two groups of image lights converted by the light modulation module 100, the transmission paths of the first group of image lights R11 inside the optical waveguide component 200 can be R12, R13 and R14 in sequence, and the transmission paths of the second group of image lights R21 inside the optical waveguide component 200 can be R22, R23 and R24 in sequence, and they can be transmitted separately inside the optical waveguide component 200.

[0059] By using the image adjustment device described in the embodiment of the present invention, the light modulation module simultaneously converts the output light of the corresponding frame image into at least two groups of image lights with different image distances, so that the image is displayed on different imaging surfaces through the at least two groups of image lights with different image distances. When applied to a display panel, a display system with at least two imaging surfaces is formed.

[0060] Optionally, the image adjustment device described in this embodiment is used, such as Figure 4 As shown, when the distances between the first imaging plane 1 and the second imaging plane 2 and the human eye are Z1 and Z2 respectively, when the first imaging plane 1 and the second imaging plane 2 display the same image, if the first imaging plane 1 and the second imaging plane 2 have corresponding brightness values ​​respectively according to the set brightness weights, after the brightness weighting, when the human eye views it, it will feel that the image is located at Z between Z1 and Z2, thereby realizing the fusion of two depth of field planes through the first imaging plane 1 and the second imaging plane 2, forming a fused image visually at the position P, achieving a sense of depth between the two imaging planes when viewing.

[0061] Optionally, the distance between the first imaging plane 1 and the second imaging plane 2 is between 500 mm and 2000 mm.

[0062] It should be noted that the specific implementation structure of the light modulation module capable of converting the light output by the display panel into at least two groups of image lights with different image distances is only an example and is not limited thereto.

[0063] Another aspect of the embodiment of the present invention further provides a display system, including a display panel and an image adjustment device with the above-described structure.

[0064] In an embodiment of the present invention, optionally, an image adjustment device is arranged on the light output side of the display panel, and the light output by the display panel is incident on a light modulation module, which converts the output light of each frame of the image displayed by the display panel into at least two groups of image lights with different image distances, and transmits the image light through an optical waveguide element and transmits the at least two groups of image light to different imaging planes through a light-collecting element, respectively, and displays images on different imaging planes, thereby forming a display system with at least two focal planes. In this way, when viewing images using the display system, through the adjustment of the human eye, when the image on one of the imaging planes is clearly observed, the images on other imaging planes are in a blurred state, which is consistent with the feeling of viewing a three-dimensional physical scene, so as to avoid focusing on the same image plane for a long time, causing fatigue and dizziness, and to eliminate convergence conflict.

[0065] Combination Figures 1 to 4 , and referring to the above detailed description of the image adjustment device, those skilled in the art should be able to understand the specific implementation structure of the display system using the image adjustment device described in the embodiment of the present invention, which will not be described in detail here.

[0066] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. An image adjustment device, characterized in that: include: The light modulation module is configured to receive the output light of each frame of image displayed by the display panel, and convert the output light of each frame of image into at least two groups of image lights with different image distances; an optical waveguide element, configured to receive at least two groups of the image light and transmit each group of the image light along a preset path; A light extraction component, disposed on the light output side of the optical waveguide element, and configured to transmit each group of image light output by the optical waveguide element to different imaging surfaces respectively; The light modulation module comprises: A light separation element, used for separating the output light of each frame of image to obtain at least two groups of separated light of the output light; An image distance adjusting element, used to adjust the image distances of at least two groups of separated light rays respectively, so as to obtain at least two groups of image light rays with different image distances; The light separation element includes a spatial light modulator, and obtains two groups of separated light of the output light by converting the output light into P polarized light and S polarized light; or, The light separation element comprises a wavelength converter, which converts the output light into light of different wavelengths to obtain at least two groups of separated light of the output light; The image adjustment device also includes: The reflective element is used to receive the image light output by the light modulation module and reflect the image light into the optical waveguide element.

2. The image adjustment device according to claim 1, characterized in that: The light modulation module is configured to convert the output light of the corresponding frame image into at least two groups of image lights with different image distances in a time-sharing manner within a display period of each frame image displayed by the display panel.

3. The image adjustment device according to claim 1, characterized in that: If the light separation element includes a spatial light modulator, the image distance adjustment element includes a zoom lens, the P-polarized light and the S-polarized light pass through the zoom lens, and the zoom lens obtains two groups of image lights with different image distances by focusing the P-polarized light and the S-polarized light to different degrees.

4. The image adjustment device according to claim 1, characterized in that: If the light separation element includes a wavelength converter, the image distance adjustment element includes a metasurface lens, and the metasurface lens obtains at least two groups of image lights with different image distances by performing different phase adjustments on separated lights of different wavelengths.

5. The image adjustment device according to claim 1, characterized in that: The light extraction component includes an outcoupling grating.

6. The image adjustment device according to claim 1, characterized in that: The image adjustment device further comprises an incoupling grating arranged at the light incident end of the optical waveguide element.

7. A display system, comprising a display panel, characterized in that: It also includes the image adjustment device according to any one of claims 1 to 6.

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