Optical module and display device
By integrating a refractive component with the display component and using a pancake lens, the optical module's thickness is reduced, enabling adjustable diopter without additional lenses, improving user convenience.
Patent Information
- Application Number
- CN202411318681.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-20
- Publication Date
- 2024-12-20
AI Technical Summary
Existing optical modules in near-eye display devices have a relatively large thickness.
The optical module integrates a display component and a refractive component, such as a liquid crystal lens, where the refractive component is attached to the display component to adjust diopter without additional thickness, and includes a pancake lens and linear polarizer to further reduce thickness.
The solution reduces the thickness of the optical module by saving space between components, allowing for adjustable diopter without additional lenses and enhancing user convenience.
Smart Images
Figure CN119165659A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the technical field of near-eye display devices, and more specifically, to an optical module and a display device. Background Art
[0002] An optical module is provided in the related art. The optical module includes a display component and a refractive component. The refractive component is used to adjust the refractive power of the imaging light of the display component.
[0003] However, the optical module in the related art has a relatively large thickness. Summary of the invention
[0004] The present application provides an optical module and a display device to solve the problem of how to reduce the thickness of the optical module.
[0005] According to one aspect of the present application, an optical module is provided, comprising a display component and a refractive component. The display component has a display side, and the display component can emit imaging light to the display side. The refractive component is arranged on the display side and attached to the display component, and the refractive component is used to adjust the diopter of the imaging light.
[0006] The optical module saves the space between the refractive component and the display component by attaching the refractive component to the display component, thereby reducing the thickness of the optical module.
[0007] In one embodiment, the refractive component is a liquid crystal lens, which includes a first substrate, a first electrode, a first liquid crystal layer, and a second electrode, and the first substrate, the first electrode, the first liquid crystal layer, and the second electrode are arranged in a direction opposite to the propagation direction of the imaging light. The display component is an LCD, and the LCD includes a color filter layer and a second liquid crystal layer, and the color filter layer is arranged on a side of the second liquid crystal layer close to the display side. The side of the second electrode facing away from the first liquid crystal layer is attached to the side of the color filter layer facing away from the second liquid crystal layer.
[0008] In one embodiment, the second electrode is attached to the color filter layer by one of pasting, evaporation or sputtering.
[0009] In one embodiment, the refractive component is a liquid crystal lens, which includes a first substrate, a first electrode, a first liquid crystal layer, a second electrode, and a second substrate, and the first substrate, the first electrode, the first liquid crystal layer, the second electrode, and the second substrate are arranged in a direction opposite to the propagation direction of the imaging light. The display component includes a third substrate, a color filter layer, and a second liquid crystal layer, and the third substrate is arranged close to the display side, and the color filter layer is arranged between the third substrate and the second liquid crystal layer. The optical module also includes an adhesive layer, which is arranged between the second substrate and the third substrate, and the second substrate is attached to the side of the third substrate close to the display side through the adhesive layer.
[0010] In one embodiment, the adhesive layer includes optically transparent adhesive or optically transparent resin.
[0011] In one embodiment, the display component is one of LCD, OLED and Micro LED.
[0012] In one embodiment, the liquid crystal lens is one of a twisted nematic type, an in-plane switching type or a vertical alignment type.
[0013] In one of the embodiments, in a direction perpendicular to the propagation direction of the imaging light, the difference between the size of the display component and the size of the refractive component is less than or equal to 76.2 mm.
[0014] In one embodiment, the optical module further comprises a pancake lens and a linear polarizer. Along the propagation direction of the imaging light, the pancake lens is arranged on a side of the refractive component away from the display component. The linear polarizer is arranged between the pancake lens and the refractive component.
[0015] According to another aspect of the present application, a display device is provided, comprising an optical module as in any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0017] Figure 1 FIG. 4 is a schematic diagram of the structure of a display device in an embodiment of the present application.
[0018] Figure 2 for Figure 1 A schematic structural diagram of the optical module in the illustrated embodiment.
[0019] Figure 3 for Figure 1 A schematic diagram of a first usage state of the liquid crystal lens in the illustrated embodiment.
[0020] Figure 4 for Figure 1 A schematic diagram of a second use state of the liquid crystal lens in the illustrated embodiment.
[0021] Figure 5 for Figure 1 A schematic diagram of a third usage state of the liquid crystal lens in the illustrated embodiment.
[0022] Figure 6 FIG. 4 is a schematic diagram of the structure of a display device in another embodiment of the present application.
[0023] Description of main component symbols:
[0024] Display device 1, 1a
[0025] Optical module 100
[0026] Display component 10
[0027] Display side 10a
[0028] Color filter layer 11
[0029] The second liquid crystal layer 12
[0030] The third substrate 13
[0031] Refractive component 20
[0032] Liquid crystal lens 21
[0033] First substrate 211
[0034] First electrode 212
[0035] First liquid crystal layer 213
[0036] Liquid crystal molecules 2131
[0037] Second electrode 214
[0038] Second substrate 215
[0039] Pancake lens 30
[0040] Paste layer 40
[0041] Linear polarizer 50
[0042] Housing 200
[0043] Imaging light X
[0044] The propagation direction of imaging light is A DETAILED DESCRIPTION
[0045] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments.
[0046] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be a centered element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may also be a centered element. When an element is considered to be "set on" another element, it may be directly set on the other element or there may also be a centered element. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.
[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "or / and" used herein includes any and all combinations of one or more related listed items.
[0048] Some embodiments of the present application are described in detail. In the absence of conflict, the following embodiments and features of the embodiments can be combined with each other.
[0049] Example
[0050] Figure 1 is a schematic structural diagram of a display device 1 in an embodiment of the present application; Figure 2 for Figure 1 A schematic structural diagram of an optical module 100 in the illustrated embodiment; Figure 3 for Figure 1 A schematic diagram of a first use state of the liquid crystal lens 21 in the illustrated embodiment; Figure 4 for Figure 1 A schematic diagram of a second use state of the liquid crystal lens 21 in the illustrated embodiment.
[0051] See also Figure 1 The embodiment of the present application provides a display device 1, including an optical module 100. The display device 1 is, for example, a VR (Virtual Reality) head-mounted device, including VR glasses or a VR helmet, etc., which is not limited here.
[0052] In some embodiments, the display device 1 further includes a housing 200, and the optical module 100 is installed in the housing 200. Optionally, the housing 200 is made of one of ABS plastic (Acrylonitrile Butadiene Styrene plastic), PP (polypropylene), PS (Polystyrene) and PC (Polycarbonate).
[0053] The optical module 100 includes a display component 10 and a refractive component 20. Figure 3 ), the cross-section of the housing 200 may be configured to be circular, elliptical, rectangular, square or other irregular shapes.
[0054] See also Figure 2 The optical module 100 provided in one embodiment of the present application includes a display component 10 and a refractive component 20. The display component 10 has a display side 10a, and the display component 10 can emit imaging light X to the display side 10a (see Figure 3 The refractive component 20 is disposed on the display side 10a and attached to the display component 10. Figure 3 and Figure 4 As shown, the refractive component 20 is used to adjust the refractive power of the imaging light X.
[0055] The above optical module 100 adjusts the diopter of the imaging light X by setting a refractive component 20 on the display side 10a, so that the diopter can be matched with different myopia levels of users, without adding myopia lenses in the optical module 100, so that the thickness of the optical module 100 can be reduced, and there is no need to hang or manually adjust the myopia lenses during use, which improves the convenience of use. Since the size of the diopter can be adjusted by the refractive component 20, the optical module 100 can be applied to most users with myopia or astigmatism, and when changing users with different myopia levels, there is no need to purchase myopia lenses again. By attaching the refractive component 20 to the display component 10, the space between the refractive component 20 and the display component 10 is saved, so that the thickness of the optical module 100 is further reduced.
[0056] It should be noted that the thickness direction of the optical module 100 is the propagation direction A of the imaging light X.
[0057] In some embodiments, Figure 2As shown, the refractive component 20 is a liquid crystal lens 21, and the liquid crystal lens 21 includes a first substrate 211, a first electrode 212, a first liquid crystal layer 213, and a second electrode 214. The first substrate 211, the first electrode 212, the first liquid crystal layer 213, and the second electrode 214 are arranged in a direction opposite to the propagation direction A of the imaging light X. The display component 10 is an LCD (Liquid Crystal Display), and the LCD includes a color filter layer 11 and a second liquid crystal layer 12. The color filter layer 11 is arranged on a side of the second liquid crystal layer 12 close to the display side 10a. The side of the second electrode 214 facing away from the first liquid crystal layer 213 is attached to the side of the color filter layer 11 facing away from the second liquid crystal layer 12. Among them, the LCD can be one of a twisted nematic type (TN), an in-plane switching type (IPS), or a vertical alignment type (VA).
[0058] In this way, by attaching the side of the second electrode 214 away from the first liquid crystal layer 213 to the side of the color filter layer 11 away from the second liquid crystal layer 12, there is no need to set a substrate on the side of the second electrode 214 away from the first liquid crystal layer 213 in the liquid crystal lens 21, and there is no need to set a substrate on the side of the color filter layer 11 away from the second liquid crystal layer 12 in the LCD, so at least the thickness of two layers of substrates can be saved, thereby further reducing the thickness of the optical module 100. Specifically, the thickness of the optical module 100 is 5 mm to 50 mm. In the propagation direction A along the imaging light X, the thickness of the liquid crystal lens 21 is 0.5 mm to 50 mm.
[0059] See also Figure 4 When in use, a voltage (such as 10V) is applied to the first electrode 212 and the second electrode 214 (see Figure 2 ), the electric field generated will deflect the liquid crystal molecules 2131 in the first liquid crystal layer 213, so that each part of the first liquid crystal layer 213 has a different refractive index by changing the arrangement direction of the liquid crystal molecules 2131 in each part of the first liquid crystal layer 213. Figure 3 As shown, when no voltage is applied to the first electrode 212 and the second electrode 214 (ie, the voltage is 0V), the liquid crystal molecules 2131 in the first liquid crystal layer 213 are not deflected. Figure 4 As shown, when a voltage is applied to the first electrode 212 and the second electrode 214, a non-uniform electric field can be applied to the uniform first liquid crystal layer 213 to generate a gradient refractive index. For example, a voltage can be applied to a portion outside the central portion of the first liquid crystal layer 213 through the first electrode 212 and the second electrode 214, so that the imaging light X can be effectively tilted when passing through the first liquid crystal layer 213, so that the output wavefront can be focused on a focal point for imaging, thereby being suitable for myopic users.
[0060] Figure 5for Figure 1 A schematic diagram of a third use state of the liquid crystal lens 21 in the illustrated embodiment.
[0061] By changing the magnitude of the voltage applied to the first electrode 212 and the second electrode 214, the refractive power of the imaging light X can be changed to adapt to different myopia levels of the user. Figure 5 As shown, when a larger voltage is applied to the first electrode 212 and the second electrode 214, such as when the voltage is increased from Figure 4 When 10V becomes 20V, the arrangement direction of the liquid crystal molecules 2131 in the part outside the central part of the first liquid crystal layer 213 is more greatly deflected, so that the inclination degree of the imaging light X passing through the part outside the central part of the first liquid crystal layer 213 is further increased, that is, the refractive power is further increased.
[0062] In some embodiments, the second electrode 214 is attached to the color filter layer 11 by bonding, evaporation or sputtering.
[0063] In some embodiments, the liquid crystal lens 21 is one of a twisted nematic (TN), an in-plane switching (IPS) or a vertical alignment (VA). Optionally, in a plane perpendicular to the propagation direction A of the imaging light X, the cross section of the liquid crystal lens 21 is configured to be circular, elliptical, rectangular, square or other irregular shapes.
[0064] In some embodiments, in a direction perpendicular to the propagation direction A of the imaging light X, the size of the refractive component 20 is configured to match the size of the display component 10, and the size of the display component 10 is not limited herein. Specifically, in a direction perpendicular to the propagation direction A of the imaging light X, the size of the display component 10 may be greater than, equal to, or less than the size of the refractive component 20. Optionally, in a direction perpendicular to the propagation direction A of the imaging light X, the difference between the size of the display component 10 and the size of the refractive component 20 is less than or equal to 76.2 mm.
[0065] In some embodiments, Figure 2As shown, the optical module 100 further includes a pancake lens 30 and a linear polarizer 50. Along the propagation direction A of the imaging light X, the pancake lens 30 is disposed on the side of the refractive component 20 away from the display component 10, and the linear polarizer 50 is disposed between the pancake lens 30 and the refractive component 20. In this way, by disposing the pancake lens 30, the distance between the display component 10 and the pancake lens 30 along the propagation direction A of the imaging light X is reduced by the design of the folded optical path, which is conducive to further reducing the thickness of the optical module 100. Optionally, along the propagation direction A of the imaging light X, the pancake lens 30 and the refractive component 20 are spaced apart. Among them, the distance between the pancake lens 30 and the refractive component 20 is set according to the use requirements and is not limited here. The number of stacked layers and the number of optical functional layers of the pancake lens 30 are not limited here.
[0066] Optionally, the pancake lens 30 is made of optical lens materials such as glass, COC (cycloolefin copolymer), PMMA (PolymethylMethacrylate) or PC (Polycarbonate).
[0067] In some embodiments, the refractive index of the pancake lens 30 is 1.4 to 2.0, such as 1.4, 1.5, 1.7, 2.0, etc.
[0068] Figure 6 FIG. 1 is a schematic structural diagram of a display device 1 a in another embodiment of the present application.
[0069] See also Figure 6 The display device 1a in the second embodiment is substantially the same as the display device 1 in the first embodiment, except that in the display device 1a, the liquid crystal lens 21 further comprises a second substrate 215, and along the propagation direction A of the imaging light X, the second substrate 215 is disposed on the side of the second electrode 214 away from the first liquid crystal layer 213, the display assembly 10 further comprises a third substrate 13, the third substrate 13 is disposed close to the display side 10a, and the color filter layer 11 is disposed between the third substrate 13 and the second liquid crystal layer 12. The optical module 100 further comprises an adhesive layer 40, the adhesive layer 40 is disposed between the second substrate 215 and the third substrate 13, and the second substrate 215 is adhered to the side of the third substrate 13 close to the display side 10a through the adhesive layer 40, thereby reducing the space between the second substrate 215 and the third substrate 13, and reducing the thickness of the optical module 100. For example, the thickness of the optical module 100 is 10 mm to 50 mm.
[0070] The display component 10 in this embodiment can be one of LCD, OLED (Organic Light-Emitting Diode) and Micro LED (Micro Light Emitting Diode).
[0071] The adhesive layer 40 in this embodiment may be optically clear adhesive (OCA) or optically clear resin (OCR), or other types of adhesive materials.
[0072] The above implementation modes are only used to illustrate the technical solutions of the present application and are not intended to limit the present application. Although the present application has been described in detail with reference to the above preferred implementation modes, a person skilled in the art should understand that the technical solutions of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. An optical module, characterized in that: include: A display component having a display side, the display component being capable of emitting imaging light toward the display side; The refractive component is arranged on the display side and attached to the display component, and the refractive component is used to adjust the refractive power of the imaging light.
2. The optical module according to claim 1, characterized in that: The refractive component is a liquid crystal lens, which includes a first substrate, a first electrode, a first liquid crystal layer, and a second electrode, wherein the first substrate, the first electrode, the first liquid crystal layer, and the second electrode are arranged in a direction opposite to a propagation direction of the imaging light; The display component is an LCD, and the LCD includes a color filter layer and a second liquid crystal layer, and the color filter layer is arranged on a side of the second liquid crystal layer close to the display side; A side of the second electrode facing away from the first liquid crystal layer is attached to a side of the color filter layer facing away from the second liquid crystal layer.
3. The optical module according to claim 2, characterized in that: The second electrode is attached to the color filter layer by one of pasting, evaporation or sputtering.
4. The optical module according to claim 1, characterized in that: The refractive component is a liquid crystal lens, which includes a first substrate, a first electrode, a first liquid crystal layer, a second electrode and a second substrate, wherein the first substrate, the first electrode, the first liquid crystal layer, the second electrode and the second substrate are arranged in a direction opposite to a propagation direction of the imaging light; The display assembly comprises a third substrate, a color filter layer and a second liquid crystal layer, wherein the third substrate is arranged close to the display side, and the color filter layer is arranged between the third substrate and the second liquid crystal layer; The optical module further includes an adhesive layer, which is disposed between the second substrate and the third substrate, and the second substrate is adhered to a side of the third substrate close to the display side through the adhesive layer.
5. The optical module according to claim 4, characterized in that: The adhesive layer includes optically transparent glue or optically transparent resin.
6. The optical module according to claim 4, characterized in that: The display component is one of LCD, OLED and MicroLED.
7. The optical module according to claim 2 or 4, characterized in that: The liquid crystal lens is one of a twisted nematic type, an in-plane switching type or a vertical alignment type.
8. The optical module according to claim 1, characterized in that: In a direction perpendicular to the propagation direction of the imaging light, a difference between a size of the display component and a size of the refractive component is less than or equal to 76.2 mm.
9. The optical module according to claim 1, characterized in that: The optical module also includes a pancake lens and a linear polarizer; Along the propagation direction of the imaging light, the pancake lens is arranged on a side of the refractive component away from the display component; The linear polarizer is disposed between the pancake lens and the diopter component.
10. A display device, characterized in that: The optical module comprises the optical module as claimed in any one of claims 1 to 9.