Imaging display device and near-eye display system

Abstract

The present application provides an imaging display device and a near-eye display system. The imaging display device forms one of left-handed circularly polarized light and right-handed circularly polarized light through a polarizer, a quarter-wave plate, and a liquid crystal variable phase retarder, and can be switched through the liquid crystal variable phase retarder. When the left-handed circularly polarized light and the right-handed circularly polarized light pass through a liquid crystal polarization lens, the focal length of the liquid crystal polarization lens is reflected as +f1 and ‑f1, and then a variable focal length is provided through a liquid crystal zoom lens, so as to achieve the effect of continuous focusing by voltage-controlled liquid crystal. The focal length f of the lens group composed of the liquid crystal polarization lens and the liquid crystal zoom lens satisfies: #imgabs0#; f1 is the focal length of the liquid crystal polarization lens; f2 is the focal length of the liquid crystal zoom lens; and f2 is the zoom focal length; d is the distance between the liquid crystal polarization lens and the liquid crystal zoom lens.

Description

Technical Field

[0001] The present application relates to the field of near-eye display technology, and in particular to an imaging display device and a near-eye display system. Background Art

[0002] Different near-eye display systems such as AR (Augmented Reality) or VR (Virtual Reality) require convergence adjustment when in use. When the user performs convergence adjustment, the AR or VR device needs to adjust the focus synchronously. However, the current focusing method often uses a mechanical focusing method, but the mechanical focusing method is relatively complex in design and cumbersome in operation. Summary of the invention

[0003] The present application provides an imaging display device and a near-eye display system, which simplify the structure of the imaging display device.

[0004] The present application provides an imaging display device, which includes: a display screen, and a polarizing plate, a quarter-wave plate, a liquid crystal variable phase delay plate, a liquid crystal polarizing lens, and a liquid crystal zoom lens arranged along the propagation direction of light; wherein:

[0005] When a first voltage is applied to the liquid crystal variable phase retarder, the light emitted by the display screen passes through the polarizer, the quarter wave plate, and the liquid crystal variable phase retarder to form one of right-handed circularly polarized light and left-handed circularly polarized light;

[0006] When a second voltage is applied to the liquid crystal variable phase retarder, the light emitted by the display screen passes through the polarizer, the quarter wave plate, and the liquid crystal variable phase retarder to form the other of right-handed circularly polarized light and left-handed circularly polarized light;

[0007] The focal length f of the lens group composed of the liquid crystal polarizing lens and the liquid crystal zoom lens satisfies:

[0008] ; wherein, f1 is the focal length of the liquid crystal polarizing lens; f2 is the focal length of the liquid crystal variable focus lens; and f2 is the zoom focal length, and the value of f2 changes with the voltage applied to the liquid crystal variable focus lens; d is the distance between the liquid crystal polarizing lens and the liquid crystal variable focus lens.

[0009] In the above technical solution, one of left-handed circularly polarized light and right-handed circularly polarized light is formed by a polarizer, a quarter wave plate, and a liquid crystal variable phase retarder, and can be switched by the liquid crystal variable phase retarder. When the left-handed circularly polarized light and the right-handed circularly polarized light pass through the liquid crystal polarization lens, the focal length of the liquid crystal polarization lens switches between +f1 and -f1, and a variable focal length is provided by the liquid crystal zoom lens, thereby achieving the effect of controlling the lens by voltage and then achieving focusing.

[0010] In a specific possible implementation manner, the liquid crystal polarizing lens is attached to the liquid crystal variable focus lens;

[0011] The focal length f of the lens group composed of the liquid crystal polarizing lens and the liquid crystal zoom lens satisfies: .

[0012] In a specific embodiment, the focal length of the liquid crystal polarizing lens is D1, and the focal length of the liquid crystal polarizing lens can be switched between +D1 and -D1. ;

[0013] The focal length of the liquid crystal zoom lens is D2, ; The range of D2 is (0~A); then:

[0014] A≥2D1.

[0015] In a specific embodiment, the focal length of the liquid crystal polarizing lens satisfies:

[0016] , where r is the radius of the liquid crystal variable focus lens, Δn is the birefringence of the liquid crystal material, and D is the thickness of the liquid crystal layer.

[0017] In a specific embodiment, the polarizer is a polarizer with a polarization direction in a horizontal direction;

[0018] When a first voltage is applied to the liquid crystal variable phase retarder, the light forms left-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder; when a second voltage is applied to the liquid crystal variable phase retarder, the light forms right-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder.

[0019] In a specific possible implementation manner, the polarizer is a polarizer with a polarization direction in a vertical direction;

[0020] When a first voltage is applied to the liquid crystal variable phase retarder, the light forms right-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder; when a second voltage is applied to the liquid crystal variable phase retarder, the light forms left-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder.

[0021] In a specific implementation scheme, the liquid crystal variable focus lens includes a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer filled between the first substrate and the second substrate; wherein,

[0022] A first electrode is arranged on the side of the first substrate facing the second substrate; a second electrode is arranged on the side of the second substrate facing the first substrate; the first electrode includes a plurality of nested and concentric electrodes, and the plurality of electrodes are insulated from each other; the second electrode is a planar transparent electrode.

[0023] In a specific possible implementation manner, the liquid crystal polarization lens includes a third substrate and a fourth substrate disposed opposite to each other, and a liquid crystal layer filled between the third substrate and the fourth substrate;

[0024] Wherein, the third substrate and the first substrate are an integral structure.

[0025] In a specific implementation manner, the liquid crystal variable phase retarder comprises a fifth substrate and a sixth substrate arranged opposite to each other, and a liquid crystal layer filled between the fifth substrate and the sixth substrate;

[0026] A third electrode is disposed on a side of the sixth substrate facing the fifth substrate; a fourth electrode is disposed on a side of the fifth substrate facing the sixth substrate; the third electrode and the fourth electrode are both planar transparent electrodes;

[0027] The sixth substrate and the fourth substrate are an integral structure.

[0028] In a second aspect, a near-eye display system is provided, which comprises a shell, and an imaging display device as described in any one of the above items and arranged on the shell.

[0029] In the above technical solution, one of left-handed circularly polarized light and right-handed circularly polarized light is formed by a polarizer, a quarter-wave plate, and a liquid crystal variable phase retarder. When the left-handed circularly polarized light and the right-handed circularly polarized light pass through a liquid crystal polarization lens, the focal length of the liquid crystal polarization lens switches between +f1 and -f1, and a variable focal length is provided by a liquid crystal zoom lens, thereby achieving the effect of focusing by controlling the lens through voltage. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of the structure of an imaging display device provided in an embodiment of the present application;

[0031] Figure 2 A variation of the structure of the liquid crystal polarization lens and the liquid crystal variable focus lens provided in the embodiment of the present application;

[0032] Figure 3 The present invention provides a combination of a liquid crystal phase retarder, a liquid crystal polarization lens and a liquid crystal variable focus lens. DETAILED DESCRIPTION

[0033] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings.

[0034] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in one or more embodiments of this specification should be understood by people with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar words used in one or more embodiments of this specification do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0035] To facilitate understanding of the imaging display device provided in the embodiment of the present application, its application scenario is first described. The imaging display device provided in the embodiment of the present application is applied to a near-eye display system, such as in different near-eye display systems such as AR (Augmented Reality) or VR (Virtual Reality). However, when a user uses AR or VR, focusing is required. One of the current focusing methods is to use mechanical focusing, which results in a relatively complex structure. To this end, the embodiment of the present application provides an imaging display device to simplify the focusing structure and facilitate focusing. The following is a detailed description of it in conjunction with specific drawings and embodiments.

[0036] refer to Figure 1 As shown, Figure 1The structure diagram of the imaging display device provided by the embodiment of the present application is shown. The imaging display device provided by the embodiment of the present application includes a display screen 10, a polarizer 60, a quarter wave plate 20, a liquid crystal variable phase retarder 30, a liquid crystal polarizing lens 40 and a liquid crystal zoom lens 50. In a specific configuration, the display screen 10, the polarizer 60, the quarter wave plate 20, the liquid crystal variable phase retarder 30, the liquid crystal polarizing lens 40 and the liquid crystal zoom lens 50 are arranged along the propagation direction of light.

[0037] When in use, the light emitted by the display screen 10 passes through the polarizer 60, the quarter wave plate 20, the liquid crystal variable phase retarder 30, the liquid crystal polarization lens 40 and the liquid crystal zoom lens 50 in sequence, and then enters the user's eyes, and the user can see the image displayed on the display screen 10. When focusing, the light emitted by the display screen 10 is polarized by the polarizer 60, the quarter wave plate 20 and the liquid crystal variable phase retarder 30, so as to form left-handed circularly polarized light or right-handed circularly polarized light.

[0038] The liquid crystal polarization lens 40 and the liquid crystal variable focus lens 50 cooperate to achieve focusing. The focal length of the liquid crystal polarization lens 40 switches between + f1 and - f1. For example, when right-handed circularly polarized light passes through the liquid crystal polarization lens 40, the focal length of the liquid crystal polarization lens 40 is + f1; when left-handed circularly polarized light passes through the liquid crystal polarization lens 40, the focal length of the liquid crystal polarization lens 40 is - f1. The liquid crystal variable focus lens 50 is a lens with variable focal length. The focal length of the liquid crystal variable focus lens 50 is f2, and f2 is the variable focal length. The value of f2 changes with the voltage applied to the liquid crystal variable focus lens 50.

[0039] The focal length f of the lens group composed of the liquid crystal polarization lens 40 and the liquid crystal zoom lens 50 satisfies:

[0040] ; wherein f1 is the focal length of the liquid crystal polarizing lens 40; f2 is the focal length of the liquid crystal variable focus lens 50; and d is the distance between the liquid crystal polarizing lens 40 and the liquid crystal variable focus lens 50.

[0041] It can be seen from the above formula that when f2 is a variable focal length, f is also a variable focal length. Therefore, the imaging display device provided by the embodiment of the present application forms one of left-handed circularly polarized light and right-handed circularly polarized light through the polarizer 60, the quarter-wave plate 20, and the liquid crystal variable phase retarder 30, and when the left-handed circularly polarized light and the right-handed circularly polarized light pass through the liquid crystal polarizing lens 40, the focal length of the liquid crystal polarizing lens 40 switches between +f1 and -f1, and then provides a variable focal length through the liquid crystal zoom lens 50, thereby achieving the effect of controlling the lens by voltage and then achieving focusing.

[0042] Continue to refer Figure 1As shown, in the imaging display device provided in the embodiment of the present application, the light emitted by the display screen 10 is first processed by the polarizer 60, the quarter wave plate 20, and the liquid crystal variable phase retarder 30 to polarize the light into circularly polarized light. Specifically, the function of the liquid crystal variable phase retarder 30 is similar to that of the half wave plate.

[0043] When forming circularly polarized light, the angle between the optical axis direction of the quarter wave plate 20 and the polarization direction of the linearly polarized light is set to 45°, so that circularly polarized light can be obtained from the linearly polarized light. In addition, when the polarizing plate 60 is matched with the quarter wave plate 20, the following conditions are satisfied:

[0044] Polarizer 60 (polarization direction is vertical) + quarter wave plate 20 (optical axis direction is 45° to horizontal direction) = right circularly polarized light;

[0045] Polarizer 60 (polarization direction is horizontal) + quarter wave plate 20 (optical axis direction is 45° to horizontal) = left-handed circularly polarized light;

[0046] That is, when the light passes through the polarizer 60 to form a vertical polarization state, it passes through the quarter-wave plate 20 to form right-handed circularly polarized light; when the light passes through the polarizer 60 to form a horizontal polarization state, it passes through the quarter-wave plate 20 to form left-handed circularly polarized light.

[0047] The liquid crystal variable phase retarder 30 can deflect the polarization state of linearly polarized light. When a first voltage is applied to the liquid crystal variable phase retarder 30, the phase delay of the liquid crystal variable phase retarder 30 is 0, and the polarization state of the light is not modulated. The liquid crystal variable phase retarder 30 is equivalent to a parallel plate and does not change the polarization state of the linearly polarized light. When a second voltage is applied to the liquid crystal variable phase retarder 30, the phase delay of the liquid crystal variable phase retarder 30 is 1 / 2 wavelength, which can change the rotation direction of the circularly polarized light. Specifically, the polarization state of the incident circularly polarized light can be rotated 90°. Thereby, the polarization state of the formed circularly polarized light can be switched between left-handed circularly polarized light and right-handed circularly polarized light. When specifically controlled, by adopting the following method: Figure 1 The applied voltage V1 is used for control. When the polarization state of circularly polarized light is being processed, it can be controlled by adjusting the magnitude of the applied voltage V1.

[0048] That is, when the first voltage is applied to the liquid crystal variable phase retarder 30, the light emitted by the display screen 10 passes through the polarizer 60, the quarter wave plate 20, and the liquid crystal variable phase retarder 30 to form one of right-handed circularly polarized light and left-handed circularly polarized light; and when the second voltage is applied to the liquid crystal variable phase retarder 30, the light emitted by the display screen 10 passes through the polarizer 60, the quarter wave plate 20, and the liquid crystal variable phase retarder 30 to form the other of right-handed circularly polarized light and left-handed circularly polarized light.

[0049] It can be seen from this that the imaging display device provided in the embodiment of the present application can change the polarization state of circularly polarized light by applying the first voltage to the liquid crystal variable phase retarder 30 and applying the first voltage, and then when passing through the liquid crystal polarization lens 40, the focal length of the liquid crystal polarization lens 40 can be expressed as + f1 or - f1, so that the light forms a converging or diverging light after passing through the liquid crystal polarization lens 40. In addition, by applying different voltages to the liquid crystal zoom lens 50, the focal length f2 of the liquid crystal zoom lens 50 is adjusted, so that the focal length f of the lens group composed of the liquid crystal zoom lens 50 and the liquid crystal polarization lens 40 can be changed, thereby realizing the adjustment of the focal length of the imaging display device.

[0050] In a specific implementation, the liquid crystal polarizing lens 40 is attached to the liquid crystal variable focus lens 50. That is, the distance d between the liquid crystal polarizing lens 40 and the liquid crystal variable focus lens 50 is 0. Then the focal length f of the lens group composed of the liquid crystal polarizing lens 40 and the liquid crystal variable focus lens 50 satisfies: When f2 is zoomable, f is also zoomable, and f changes with the change of f2.

[0051] For ease of understanding, in the embodiment of the present application, the optical focal length is introduced. The optical focal length is equal to the difference between the convergence of the image-side beam and the convergence of the object-side beam, and it represents the ability of the optical system to deflect light. In the embodiment of the present application, the optical focal length of the liquid crystal polarization lens 40 is D1, where: When the focal length of the liquid crystal zoom lens 50 is + f1 and − f1, the optical focal length of the liquid crystal polarizing lens 40 can be switched between + D1 and − D1.

[0052] In addition, the optical power of the liquid crystal zoom lens 50 is D2, where When f2 is a variable focal length, D2 is also a variable optical focal length. Exemplarily, the variation range of D2 is (0~A). The optical focal lengths of the liquid crystal polarizing lens 40 and the liquid crystal variable focus lens 50 provided in the embodiment of the present application satisfy: A≥2 D1.

[0053] The focal length of the lens group after the liquid crystal zoom lens 50 and the liquid crystal polarization lens 40 are combined is D n , . When the focal length of the liquid crystal polarizing lens 40 switches between +D1 and -D1, and the focal length variation range of the liquid crystal zoom lens 50 is (0, A), the focal length of the lens group formed by combining the liquid crystal zoom lens 50 with the liquid crystal polarizing lens 40 can be extended to (-D1, -D1+A)∪(D1, D1+A). When A≥2D1, the focal length of the lens group formed by combining the liquid crystal zoom lens 50 with the liquid crystal polarizing lens 40 can achieve continuous zooming in the entire range of (-D1, D1+A), which widens the zooming range compared to a single liquid crystal zoom lens 50 or a liquid crystal polarizing lens 40, and achieves continuous zooming during zooming.

[0054] In an optional solution, the focal length of the liquid crystal polarization lens 40 satisfies: , where r is the radius of the liquid crystal variable focus lens 50, Δn is the birefringence of the liquid crystal material, and D is the thickness of the liquid crystal layer. Specifically, under the action of the external electric field, the liquid crystal layer of the liquid crystal variable focus lens 50 forms a non-uniform gradient distribution of different refractive indices. From the formula The maximum focal length of the liquid crystal zoom lens 50 can be determined by controlling the radius of the liquid crystal zoom lens 50 and the thickness of the liquid crystal layer.

[0055] In a specific embodiment, the polarizer 60 is a polarizer 60 with a polarization direction in the horizontal direction;

[0056] When a first voltage is applied to the liquid crystal variable phase retarder 30, the light passes through the polarizer 60, the quarter wave plate 20 and the liquid crystal variable phase retarder 30 to form left-handed circularly polarized light; when a second voltage is applied to the liquid crystal variable phase retarder 30, the light passes through the polarizer 60, the quarter wave plate 20 and the liquid crystal variable phase retarder 30 to form right-handed circularly polarized light.

[0057] When the polarizing plate 60 adopts different polarization directions, the corresponding liquid crystal polarizing lens 40 is specifically:

[0058] 1) When the polarization direction of the polarizer 60 is in the vertical direction, the polarizer 60 (polarization direction is in the vertical direction) + quarter wave plate 20 (optical axis direction is 45° to the horizontal direction) + liquid crystal variable phase retardation plate 30 (second voltage applied) + liquid crystal polarization lens 40, the focal length of the liquid crystal polarization lens 40 is +f1.

[0059] Polarizer 60 (polarization direction is vertical) + quarter wave plate 20 (optical axis direction is 45° to horizontal direction) + liquid crystal variable phase retardation plate 30 (first voltage applied) + liquid crystal polarization lens 40, the focal length of the liquid crystal polarization lens 40 is -f1.

[0060] 2) When the polarization direction of the polarizer 60 is horizontal, the polarizer 60 (polarization direction is horizontal) + quarter wave plate 20 (optical axis direction is 45° to the horizontal direction) + liquid crystal variable phase delay plate 30 (second voltage applied) + liquid crystal polarization lens 4040, the focal length of the liquid crystal polarization lens 40 is -f1.

[0061] Polarizer 60 (polarizing direction is horizontal) + quarter wave plate 20 (optical axis direction is 45° to the horizontal direction) + liquid crystal variable phase retardation plate 30 (first voltage applied) + liquid crystal polarizing lens 40, the focal length of the liquid crystal polarizing lens 40 is +f1.

[0062] It can be seen from the above description that the liquid crystal polarizing lens 40 can realize the state change of applying the first voltage / applying the first voltage through the liquid crystal variable phase delay plate 30, so that the focal length of the liquid crystal polarizing lens 40 can be switched between +f1 / -f1, that is, the imaging display device can realize the selection of two focal lengths.

[0063] When the quarter wave plate 20 is specifically configured, the quarter wave plate 20 provided in the embodiment of the present application may be an achromatic wave plate, so that the quarter wave plate 20 can convert linear polarized light into circular polarized light in a wide spectrum range.

[0064] Continue to refer Figure 1 As shown, when the liquid crystal zoom lens 50 is specifically arranged, the liquid crystal zoom lens 50 includes a first substrate 51 and a second substrate 52 arranged opposite to each other, and a liquid crystal layer filled between the first substrate 51 and the second substrate 52. The first substrate 51 and the second substrate 52 enclose a space for accommodating the liquid crystal layer. In addition, a first electrode is arranged on the side of the first substrate 51 facing the second substrate 52, and a second electrode is arranged on the side of the second substrate 52 facing the first substrate 51. That is, the first electrode and the second electrode are arranged on the two opposite surfaces of the first substrate 51 and the second substrate 52 in a one-to-one correspondence.

[0065] When the first electrode and the second electrode are specifically arranged, the first electrode includes a plurality of nested and concentric electrodes, and the plurality of electrodes are insulated from each other. That is, the first electrode is composed of a plurality of nested concentric annular electrodes, and when the plurality of concentric annular electrodes are arranged, the adjacent annular electrodes are insulated. When the second electrode is arranged, the second electrode is a planar transparent electrode. That is, the second electrode is a layered structure, which is laid flat on the side of the second substrate 52 facing the first substrate 51.

[0066] When adjusting the focal length f2 of the liquid crystal zoom lens 50, the focal length of the lens can be continuously changed between f2-∞ by adjusting the magnitude of the electric field applied to the liquid crystal zoom lens 50. Figure 1 As shown in Figure 1The voltage V2 shown in the example can adjust the focal length of the liquid crystal zoom lens 50.

[0067] It should be understood that an alignment layer is disposed on the liquid crystal variable focus lens 50 to align the initial state of the liquid crystal in the liquid crystal layer.

[0068] Continue to refer Figure 1 As shown, the liquid crystal polarization lens 40 includes a third substrate 41 and a fourth substrate 42 disposed opposite to each other, and a liquid crystal layer filled between the third substrate 41 and the fourth substrate 42. The third substrate 41 and the fourth substrate 42 enclose a space for accommodating the liquid crystal layer.

[0069] Continue to refer Figure 1 As shown, the liquid crystal variable phase delay plate 30 includes a fifth substrate 31 and a sixth substrate 32 arranged opposite to each other, and a liquid crystal layer filled between the fifth substrate 31 and the sixth substrate 32. That is, the space for accommodating the liquid crystal layer is surrounded by the fifth substrate 31 and the sixth substrate 32. In addition, a third electrode is arranged on the side of the sixth substrate 32 facing the fifth substrate 31; and a fourth electrode is arranged on the side of the fifth substrate 31 facing the sixth substrate 32. That is, the third electrode and the fourth electrode are respectively arranged on the two opposite surfaces of the fifth substrate 31 and the sixth substrate 32. When the third electrode and the fourth electrode are specifically arranged, the third electrode and the fourth electrode are both planar transparent electrodes. For example, electrodes made of indium tin oxide material.

[0070] For reference Figure 2 , Figure 2 A variation of the structure of the liquid crystal polarization lens 40 and the liquid crystal zoom lens 50 is shown. In an implementable solution, the third substrate 41 and the first substrate 51 are an integrated structure. That is, when the liquid crystal polarization lens 40 and the liquid crystal zoom lens 50 are combined, they share a substrate. At this time, the overall structure of the liquid crystal polarization lens 40 and the liquid crystal zoom lens 50 is: a fourth substrate 42, a liquid crystal layer, an intermediate substrate 70 (the third substrate 41 and the first substrate 51), a liquid crystal layer and a second substrate 52. The entire structure has three substrates and two liquid crystal layers. And electrodes (the first electrode 53 and the second electrode 54) are arranged on the intermediate substrate 70 and the second substrate 52, respectively, so as to realize the control of the liquid crystal deflection, and then realize the focusing of the liquid crystal zoom lens 50.

[0071] For reference Figure 3 , Figure 3Another combination of the liquid crystal variable phase retarder 30, the liquid crystal polarizing lens 40 and the liquid crystal zoom lens 50 is shown. In a specific implementation scheme, the third substrate 41 and the first substrate 51 are an integral structure, and the sixth substrate 32 and the fourth substrate 42 are an integral structure. That is, the liquid crystal variable phase retarder 30, the liquid crystal polarizing lens 40 and the liquid crystal zoom lens 50 are combined into a whole. At this time, the overall structure composed of the liquid crystal polarizing lens 40 and the liquid crystal zoom lens 50 is: the fifth substrate 31, the liquid crystal layer, the first intermediate substrate 90 (the sixth substrate 32 and the fourth substrate 42), the liquid crystal layer, the second intermediate substrate 80 (the third substrate 41 and the first substrate 51), the liquid crystal layer and the second substrate 52. The entire structure has five substrates and three liquid crystal layers. In addition, electrodes (the third electrode 34 and the fourth electrode 33) are arranged on the fifth substrate 31 and the first intermediate substrate 70, respectively, and electrodes (the first electrode 53 and the second electrode 54) are arranged on the second intermediate substrate 60 and the second substrate 52, respectively, so as to realize the control of the liquid crystal deflection, and then realize the focusing of the liquid crystal zoom lens 50. When this method is adopted, the liquid crystal behavioral retarder, the liquid crystal polarizing lens 40 and the liquid crystal variable focus lens 50 can be integrated into an integral structure.

[0072] It should be understood that the first substrate 51, the second substrate 52, the third substrate 41, the fourth substrate 42, the fifth substrate 31 and the sixth substrate 32, etc., of the liquid crystal variable phase retarder 30, the liquid crystal polarizing lens 40 and the liquid crystal zoom lens 50 are all made of transparent materials. For example, the above-mentioned substrates can be made of glass or other materials with high light transmittance, which are not listed here one by one.

[0073] An embodiment of the present application also provides a near-eye display system, which includes a shell, and an imaging display device and any one of the above-mentioned devices arranged on the shell.

[0074] In the above technical solution, one of left-handed circularly polarized light and right-handed circularly polarized light is formed by the polarizer 60, the quarter-wave plate 20, and the liquid crystal variable phase retarder 30, and when the left-handed circularly polarized light and the right-handed circularly polarized light pass through the liquid crystal polarizing lens 40, the focal length of the liquid crystal polarizing lens 40 is switched between +f1 and -f1, and a variable focal length is provided by the liquid crystal zoom lens 50, thereby achieving the effect of focusing by controlling the lens through voltage.

[0075] One or more embodiments of this specification are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of this specification should be included in the scope of protection of this disclosure.

[0076] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An imaging display device, characterized in that: include: Display screen, and polarizer, quarter wave plate, liquid crystal variable phase delay plate, liquid crystal polarization lens and liquid crystal zoom lens arranged along the light propagation direction; wherein, When a first voltage is applied to the liquid crystal variable phase retarder, the light emitted by the display screen passes through the polarizer, the quarter wave plate, and the liquid crystal variable phase retarder to form one of right-handed circularly polarized light and left-handed circularly polarized light; When a second voltage is applied to the liquid crystal variable phase retarder, the light emitted by the display screen passes through the polarizer, the quarter wave plate, and the liquid crystal variable phase retarder to form the other of right-handed circularly polarized light and left-handed circularly polarized light; The focal length f of the lens group composed of the liquid crystal polarizing lens and the liquid crystal zoom lens satisfies: ; wherein, f1 is the focal length of the liquid crystal polarizing lens; f2 is the focal length of the liquid crystal variable focus lens; and f2 is the zoom focal length, and the value of f2 changes with the voltage applied to the liquid crystal variable focus lens; d is the distance between the liquid crystal polarizing lens and the liquid crystal variable focus lens.

2. The imaging display device according to claim 1, characterized in that: The liquid crystal polarizing lens is attached to the liquid crystal variable focus lens; The focal length f of the lens group composed of the liquid crystal polarizing lens and the liquid crystal zoom lens satisfies: .

3. The imaging display device according to claim 2, characterized in that: The focal length of the liquid crystal polarizing lens is D1, and the focal length of the liquid crystal polarizing lens can be switched between +D1 and -D1; ; The focal length of the liquid crystal zoom lens is D2, ; The range of D2 is (0~A); then: A≥2D1.

4. The imaging display device according to claim 2, characterized in that: The focal length of the liquid crystal polarization lens satisfies: , where r is the radius of the liquid crystal variable focus lens, Δn is the birefringence of the liquid crystal material, and D is the thickness of the liquid crystal layer.

5. The imaging display device according to claim 2, characterized in that: The polarizer is a polarizer with a polarization direction in the horizontal direction; When a first voltage is applied to the liquid crystal variable phase retarder, the light forms left-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder; when a second voltage is applied to the liquid crystal variable phase retarder, the light forms right-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder.

6. The imaging display device according to claim 2, characterized in that: The polarizer is a polarizer with a polarization direction in a vertical direction; When a first voltage is applied to the liquid crystal variable phase retarder, the light forms right-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder; when a second voltage is applied to the liquid crystal variable phase retarder, the light forms left-handed circularly polarized light after passing through the polarizer, the quarter-wave plate and the liquid crystal variable phase retarder.

7. The imaging display device according to any one of claims 1 to 6, characterized in that: The liquid crystal zoom lens comprises a first substrate and a second substrate arranged opposite to each other, and a liquid crystal layer filled between the first substrate and the second substrate; wherein, A first electrode is arranged on the side of the first substrate facing the second substrate; a second electrode is arranged on the side of the second substrate facing the first substrate; the first electrode includes a plurality of nested and concentric electrodes, and the plurality of electrodes are insulated from each other; the second electrode is a planar transparent electrode.

8. The imaging display device according to claim 7, characterized in that: The liquid crystal polarization lens comprises a third substrate and a fourth substrate which are arranged opposite to each other, and a liquid crystal layer filled between the third substrate and the fourth substrate; Wherein, the third substrate and the first substrate are an integral structure.

9. The imaging display device according to claim 8, characterized in that: The liquid crystal variable phase retarder comprises a fifth substrate and a sixth substrate arranged opposite to each other, and a liquid crystal layer filled between the fifth substrate and the sixth substrate; A third electrode is disposed on a side of the sixth substrate facing the fifth substrate; a fourth electrode is disposed on a side of the fifth substrate facing the sixth substrate; the third electrode and the fourth electrode are both planar transparent electrodes; The sixth substrate and the fourth substrate are an integral structure.

10. A near-eye display system, characterized in that: It comprises a shell, and an imaging display device as claimed in any one of claims 1 to 9 and arranged on the shell.

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