Optical display module and optical display device

Abstract

The utility model provides an optical display module and an optical display device. The optical display module comprises a lens assembly, a pressing and fixing assembly and a display assembly. The lens assembly comprises a second lens and a third lens which are aligned with each other; the pressing and fixing assembly comprises a second lens pressing ring and a third lens pressing ring, the second lens pressing ring is connected with the edge of the second lens, and the third lens pressing ring is connected with the edge of the third lens; the display assembly is arranged on the side, away from the second lens, of the third lens. According to the utility model, the second lens is fixed by the second lens pressing ring, and the third lens is fixed by the third lens pressing ring, so that the second lens and the third lens are in a relaxed state, and the stress borne by the second lens and the third lens is the stress borne by a single lens; and the stress on the second lens and the third lens is not increased when the optical display module is assembled, so that the abnormal display problem that the local part of an imaging picture is slightly yellow or black due to the slightly large stress of an optical component in the prior art is solved.

Description

Technical Field

[0001] The utility model relates to the field of optical devices, in particular to an optical display module and an optical display device. Background Art

[0002] With the development of science and technology, the types of VR (virtual reality) / MR (mixed reality) products are emerging in an endless stream, and their performance is becoming more and more powerful. As the core optical display system, the Pancake (folded light path optical system) optical display module is of self-evident importance. The emergence of the Pancake module quickly gained market recognition due to its smaller size and higher imaging quality. However, the Pancake module also has its own shortcomings. The module contains a variety of polarization and phase films. During the operation or assembly of the module, the stress requirements of optical components such as lenses are extremely stringent. Slightly greater stress on optical components will cause display anomalies and reduce imaging quality. Therefore, in order to bring better experience effects to users, such display problems of VR / MR using Pancake modules still need to be solved as soon as possible. Utility Model Content

[0003] In view of the above technical problems, the technical solution adopted by the utility model is:

[0004] According to one aspect of the utility model, an optical display module is provided, comprising:

[0005] A lens assembly comprising a second lens and a third lens aligned with each other, wherein the refractive index of the second lens is greater than the refractive index of the third lens;

[0006] A pressing assembly includes a second lens pressing ring and a third lens pressing ring, wherein the second lens pressing ring is connected to the edge of the second lens and is used to fix the second lens, the third lens pressing ring is connected to the edge of the third lens and is used to fix the third lens, and the second lens pressing ring and the third lens pressing ring are both arranged between the second lens and the third lens;

[0007] The display assembly is arranged on a side of the third lens away from the second lens.

[0008] In an exemplary embodiment of the present application, the optical display module further includes:

[0009] The lens barrel assembly comprises an outer lens barrel and an inner lens barrel. The inner lens barrel is sleeved inside the outer lens barrel. The second lens, the third lens, the second lens pressing ring and the third lens pressing ring are all arranged inside the inner lens barrel. An avoidance space is arranged between the second lens and the inner lens barrel. The bottom of the inner lens barrel is connected to the display assembly.

[0010] In an exemplary embodiment of the present application, the lens assembly further includes a first lens, which is disposed inside the inner lens barrel, so that the first lens, the second lens, and the third lens are sequentially fixed inside the inner lens barrel.

[0011] In an exemplary embodiment of the present application, a sealing rubber ring is further disposed inside the inner lens barrel, and the sealing rubber ring is connected to the edge of the first lens so that the sealing rubber ring is disposed between the first lens and the second lens.

[0012] In an exemplary embodiment of the present application, a pressure ring is provided on a side of the first lens away from the sealing rubber ring, and an edge of the pressure ring is provided between the outer lens barrel and the inner lens barrel so that the pressure ring fixes the first lens.

[0013] In an exemplary embodiment of the present application, the third lens is connected to a focusing ring, the third lens is arranged on the inner wall of the inner lens barrel through the focusing ring, a clearance is arranged between the third lens and the focusing ring, and the focusing ring is located between the third lens and the display assembly.

[0014] In an exemplary embodiment of the present application, the second lens pressing ring and the third lens pressing ring are both fixed to the inner wall of the inner lens barrel by using a glue dispensing process.

[0015] In an exemplary embodiment of the present application, the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the inner lens barrel are the same as the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the second lens.

[0016] In an exemplary embodiment of the present application, the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used for the focus ring are the same as the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used for the third lens.

[0017] According to one aspect of the utility model, an optical display device is provided, comprising an adjustment bracket and two of the above-mentioned optical display modules, wherein the two optical display modules are arranged on the adjustment bracket, and the adjustment bracket is used to adjust the distance between the two optical display modules.

[0018] The utility model has at least the following beneficial effects:

[0019] The pressing assembly of the optical display module of the utility model is connected to the lens assembly, the second lens pressing ring of the pressing assembly fixes the second lens of the lens assembly, and the third lens pressing ring of the pressing assembly fixes the third lens of the lens assembly, so that the second lens and the third lens are in a relaxed state, so that the stress exerted on the second lens and the third lens is the stress exerted on a single lens, and the stress exerted on the second lens and the third lens will not increase when the optical display module is assembled, thereby solving the abnormal display problem in the prior art that the imaging screen will be partially yellowish or blackish due to slightly greater stress of optical components. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A structural cross-sectional view of an optical display module provided by an embodiment of the utility model;

[0022] Figure 2 This is a picture display diagram of what the human eye sees when the optical module in the prior art displays a pure white picture;

[0023] Figure 3 A display light path diagram of an optical module in the prior art;

[0024] Figure 4 An exploded view of the structure of the optical display module provided by an embodiment of the utility model;

[0025] Figure 5 A schematic diagram of the structure of an optical display module provided by an embodiment of the utility model;

[0026] Figure 6 A schematic diagram of an optical display device using an optical display module provided by an embodiment of the utility model;

[0027] In the figure:

[0028] 1. Pressing ring; 2. First lens; 3. Outer lens barrel; 4. Inner lens barrel; 5. Sealing rubber ring; 6. Second lens; 7. Pressing ring for second lens; 8. Pressing ring for third lens; 9. Third lens; 10. Focusing ring; 11. Display assembly; 12. Adjusting bracket;

[0029] 21. First right-hand circularly polarized light; 22. Second right-hand circularly polarized light; 23. P linearly polarized light; 24. Third right-hand circularly polarized light; 25. Left-hand circularly polarized light; 26. S linearly polarized light;

[0030] 31. Device display screen; 32. BS beam splitter; 33. Quarter phase delay plate; 34. Reflective polarizing film; 35. Human eye. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0032] The mainstream solution used in VR / MR devices on the market is the Pancake solution. Since polarized reflective films are used in Pancake optical systems or modules, the stress value of optical components must be less than or equal to 30nm. Therefore, this requirement is extremely strict. Any small negligence will lead to such problems. For example, the selection of optical system materials, the matching of structural design tolerances, the selection of glue, etc. Any small details will cause abnormal display module images, such as Figure 2 As shown in the figure, when the optical module displays a pure white screen, the human eye sees the screen display, and the screen has serious yellowing and blackening in some parts. Currently, the Pancake optical modules on the market have more or less this kind of local color cast problem.

[0033] Therefore, unreasonable tolerances of optical lens components in single-piece injection molding, module assembly and module structure design will lead to increased stress of optical lens components, which will cause local abnormalities in the VR / MR optical system or device display. Therefore, in order to solve the problem of increased comprehensive stress caused by lens processing, assembly and module structure design, the optical display module of the present invention is proposed.

[0034] like Figure 3 As shown, it is a display optical path diagram of the Pancake optical module in the prior art. When the Pancake optical module displays a picture, the first right-handed circularly polarized light (21) emitted by the device display screen (31) of the Pancake optical module passes through the BS beam splitter (32) and becomes the second right-handed circularly polarized light (22). The second right-handed circularly polarized light (22) passes through the quarter phase delay plate (33) and becomes the P linear polarized light (23). The P linear polarized light (23) is reflected by the reflective polarizing film (34) and becomes the third right-handed circularly polarized light (24). The third right-handed circularly polarized light (24) is reflected by the BS beam splitter (32) and becomes the left-handed circularly polarized light (25). The left-handed circularly polarized light (25) passes through the quarter phase delay plate (33) and becomes the S linear polarized light (26). The S linear polarized light (26) reaches the reflective polarizing film (34) and passes through it to enter the human eye (35).

[0035] The first right circularly polarized light (21), the second right circularly polarized light (22) and the third right circularly polarized light (24) are all right circularly polarized light RCP (Right Cricular Polarized), the left circularly polarized light (25) is LCP (Left Cricular Polarized), and the BS beam splitter (32) is a semi-transparent and semi-reflective film.

[0036] like Figure 1 and Figure 4 As shown, an optical display module proposed by the utility model includes a lens assembly, a pressing assembly, a display assembly 11, a barrel assembly, a sealing rubber ring 5, a pressing ring 1, and a focusing ring 10. Among them, the barrel assembly and the pressing ring 1 are used to assemble the lens assembly, the pressing assembly is used to fix the lens assembly, the display assembly 11 is used to display the image reflected by the lens assembly, the sealing rubber ring 5 is used to seal and fix the lens assembly, and the focusing ring 10 is used to adjust the focus of the lens in the lens assembly to display different images.

[0037] The lens assembly includes a first lens 2, a second lens 6 and a third lens 9 which are aligned with each other, wherein the refractive index of the second lens 6 is greater than the refractive index of the third lens 9, and the first lens 2, the second lens 6 and the third lens 9 are all arranged inside the inner lens barrel 4, so that the first lens 2, the second lens 6 and the third lens 9 are fixed inside the inner lens barrel 4 in sequence, and a display component 11 is arranged on the side of the third lens 9 away from the second lens 6, so that the light emitted by the display component 11 is reflected by the third lens 9, the second lens 6 and the first lens 2 in sequence, and then returns to the display component 11 to form an image.

[0038] The third lens 9 is connected to the focus ring 10 , and the third lens 9 is arranged on the inner wall of the inner lens barrel 4 through the focus ring 10 . The focus ring 10 is located between the third lens 9 and the display assembly 11 .

[0039] The edge of the first lens 2 is connected to the sealing ring 5 , so that the sealing ring 5 is disposed between the first lens 2 and the second lens 6 .

[0040] The pressure ring 1 is arranged on a side of the first lens 2 away from the sealing rubber ring 5 , and the edge of the pressure ring 1 is arranged between the outer lens barrel 3 and the inner lens barrel 4 so that the pressure ring 1 fixes the first lens 2 .

[0041] The pressing assembly includes a second lens pressing ring 7 and a third lens pressing ring 8. The second lens pressing ring 7 is connected to the edge of the second lens 6 and is used to fix the second lens 6. The third lens pressing ring 8 is connected to the edge of the third lens 9 and is used to fix the third lens 9. The second lens pressing ring 7 and the third lens pressing ring 8 are both arranged between the second lens 6 and the third lens 9.

[0042] The second lens pressing ring 7 and the third lens pressing ring 8 can respectively put the second lens 6 and the third lens 9 in a relaxed state, so that the stress exerted on the second lens 6 and the third lens 9 is the stress exerted on a single lens, and the stress exerted on the second lens 6 and the third lens 9 will not be increased due to the assembly of the optical display module.

[0043] The lens barrel assembly includes an outer lens barrel 3 and an inner lens barrel 4. The inner lens barrel 4 is sleeved inside the outer lens barrel 3. The second lens 6, the third lens 9, the second lens pressing ring 7 and the third lens pressing ring 8 are all arranged inside the inner lens barrel 4. The bottom of the inner lens barrel 4 is connected to the display assembly 11.

[0044] Among them, the thermal expansion coefficient and contraction ratio coefficient of the plastic material used in the inner lens barrel 4 are the same as the thermal expansion coefficient and contraction ratio coefficient of the plastic material used in the second lens 6, and the thermal expansion coefficient and contraction ratio coefficient of the plastic material used in the focusing ring 10 are the same as the thermal expansion coefficient and contraction ratio coefficient of the plastic material used in the third lens 9, so as to ensure that the second lens 6 and the inner lens barrel 4 have the same contraction ratio, and to ensure that the third lens 9 and the focusing ring 10 also have the same contraction ratio, so that when the optical display module is assembled, the second lens 6 and the inner lens barrel 4, the third lens 9 and the focusing ring 10 shrink year by year, and the stress will not increase.

[0045] Furthermore, since the second lens 6 is a high refractive index lens, its stress during the molding and injection molding process is difficult to control. Therefore, the material of the second lens 6 is determined to be a plastic material with similar properties to reduce the sensitivity of the lens material.

[0046] The third lens 9 is a low refractive index lens, and the material model APL5013VH can be selected. Since the stress at the gate position of the third lens 9 is the largest, the place where the stress of the third lens 9 is the largest can be removed by CNC or hot shearing.

[0047] In addition, avoidance spaces are provided between the second lens 6 and the inner lens barrel 4, and between the third lens 9 and the focusing ring 10. The avoidance spaces are provided to avoid edge burrs between the inner lens barrel 4 and the second lens 6, and to avoid edge burrs between the focusing ring 10 and the third lens 9, so as to prevent interference from causing increased lens stress and resulting in local display abnormalities.

[0048] The assembly gap between the second lens 6 and the inner lens barrel 4 is related to the outer diameter of the third lens 9: assuming that the width of the assembly gap between the second lens 6 and the inner lens barrel 4 is X, and the outer diameter of the third lens 9 is Y, then 0.00189≤X / Y≤0.00377, so as to reduce the stress generated during the assembly of the optical display module.

[0049] In addition, the second lens pressing ring 7 and the third lens pressing ring 8 are fixed to the inner wall of the inner lens barrel 4 by using a glue dispensing process. The use of a glue dispensing process for fixing can reduce the complexity of UV glue selection, reduce the cost of UV glue and manpower investment, and at the same time, in the lens assembly process, theoretically, will not cause an increase in stress.

[0050] like Figure 5 and Figure 6 As shown, the present application also proposes an optical display device, including an adjustment bracket 12 and two of the above-mentioned optical display modules, the two optical display modules are arranged on the adjustment bracket 12, the adjustment bracket 12 is used to adjust the distance between the two optical display modules, when the optical display device is in use, the user can adjust the distance between the two optical display modules so that each optical display module is aligned with the eyes, so that the picture of the display component 11 of each optical display module enters the corresponding human eye.

[0051] Among them, the optical display device described in the present application can be a display device of one type among VR (virtual reality), MR (mixed reality), AR (augmented reality), and XR (extended reality).

[0052] The pressing assembly of the optical display module of the utility model is connected to the lens assembly, the second lens pressing ring 7 of the pressing assembly fixes the second lens 6 of the lens assembly, and the third lens pressing ring 8 of the pressing assembly fixes the third lens 9 of the lens assembly, so that the second lens 6 and the third lens 9 are in a relaxed state, so that the stress exerted on the second lens 6 and the third lens 9 is the stress exerted on a single lens, and the stress exerted on the second lens 6 and the third lens 9 will not increase when the optical display module is assembled, thereby solving the abnormal display problem in the prior art that the imaging screen is partially yellowish or blackish due to slightly greater stress of optical components.

[0053] Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It should also be understood by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An optical display module, characterized in that: include: A lens assembly comprises a second lens (6) and a third lens (9) aligned with each other, wherein the refractive index of the second lens (6) is greater than the refractive index of the third lens (9); A pressing assembly, comprising a second lens pressing ring (7) and a third lens pressing ring (8), wherein the second lens pressing ring (7) is connected to the edge of the second lens (6), and the second lens pressing ring (7) is used to fix the second lens (6), and the third lens pressing ring (8) is connected to the edge of the third lens (9), and the third lens pressing ring (8) is used to fix the third lens (9), and the second lens pressing ring (7) and the third lens pressing ring (8) are both arranged between the second lens (6) and the third lens (9); A display component (11) is arranged on a side of the third lens (9) away from the second lens (6).

2. The optical display module according to claim 1, characterized in that: Also includes: The lens barrel assembly comprises an outer lens barrel (3) and an inner lens barrel (4), wherein the inner lens barrel (4) is sleeved inside the outer lens barrel (3), the second lens (6), the third lens (9), the second lens pressing ring (7) and the third lens pressing ring (8) are all arranged inside the inner lens barrel (4), and a clearance is arranged between the second lens (6) and the inner lens barrel (4), and the bottom of the inner lens barrel (4) is connected to the display assembly (11).

3. The optical display module according to claim 2, characterized in that: The lens assembly further comprises a first lens (2), wherein the first lens (2) is arranged inside the inner lens barrel (4), so that the first lens (2), the second lens (6), and the third lens (9) are fixed in sequence inside the inner lens barrel (4).

4. The optical display module according to claim 3, characterized in that: A sealing rubber ring (5) is also provided inside the inner lens barrel (4), and the sealing rubber ring (5) is connected to the edge of the first lens (2), so that the sealing rubber ring (5) is arranged between the first lens (2) and the second lens (6).

5. The optical display module according to claim 4, characterized in that: A pressure ring (1) is arranged on the side of the first lens (2) away from the sealing rubber ring (5), and the edge of the pressure ring (1) is arranged between the outer lens barrel (3) and the inner lens barrel (4) so ​​that the pressure ring (1) fixes the first lens (2).

6. The optical display module according to claim 5, characterized in that: The third lens (9) is connected to a focus ring (10); the third lens (9) is arranged on the inner wall of the inner lens barrel (4) through the focus ring (10); a clearance is arranged between the third lens (9) and the focus ring (10); and the focus ring (10) is located between the third lens (9) and the display assembly (11).

7. The optical display module according to claim 2, characterized in that: The second lens pressing ring (7) and the third lens pressing ring (8) are both fixed to the inner wall of the inner lens barrel (4) by using a glue dispensing process.

8. The optical display module according to claim 2, characterized in that: The thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the inner lens barrel (4) are the same as the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the second lens (6).

9. The optical display module according to claim 6, characterized in that: The thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the focus ring (10) are the same as the thermal expansion coefficient and the contraction ratio coefficient of the plastic material used in the third lens (9).

10. An optical display device, characterized in that: It comprises an adjustment bracket (12) and two optical display modules as described in any one of claims 1 to 9, wherein the two optical display modules are arranged on the adjustment bracket (12), and the adjustment bracket (12) is used to adjust the distance between the two optical display modules.

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