Optical display system and optical device

Abstract

This application provides an optical display system and optical device; wherein, the optical display system includes a beam splitter, a first lens, a first phase retarder, a reflective polarizer, a linear polarizer, and a second lens arranged sequentially from the image source side to the human eye side; wherein, the optical display system is configured to have a diopter adjustment lens on its human eye side, the diopter adjustment lens being a myopia lens or hyperopia lens worn at the human eye; the optical display system further includes a second phase retarder, and the second phase retarder is located in the optical path between the light-emitting side of the linear polarizer and the diopter adjustment lens.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and more specifically, to an optical display system and optical device. Background Technology

[0002] In existing VR optical devices with folded optical paths, the commonly used film structure is a combination of a polarizing film (POL), a reflective polarizing film (RP), and a quarter-wave plate (QWP). The light emitted from the optical display system is linearly polarized light after passing through the POL. Ideally, this light should directly enter the human eye for imaging. However, because some VR optical devices lack myopia or hyperopia adjustment functions, users need to wear glasses or contact lenses for the visual experience. In this scenario, the light that should have entered the human eye is reflected when it reaches the surface of the glasses. The reflected light, being in a polarized state, can directly enter the VR optical system. After entering the VR optical system, this portion of light follows the POL-RP-QWP path. Part of it is projected onto the display screen through the semi-transparent and semi-reflective film, while the other part is reflected by the semi-transparent and semi-reflective film and re-enters the QWP, changing its polarization state. When it passes through the RP again, the light is reflected back into the VR optical system, propagates through the same path within the system for another cycle, and finally re-enters the human eye, forming stray light. This stray light significantly degrades the display quality of VR optical devices and affects the user experience. Summary of the Invention

[0003] The purpose of this application is to provide a new technical solution for an optical display system and optical equipment.

[0004] In a first aspect, embodiments of this application provide an optical display system, the optical display system comprising a beam splitter, a first lens, a first phase retarder, a reflective polarizer, a linear polarizer, and a second lens arranged sequentially from the image source side to the human eye side; wherein, the optical display system is configured to have a diopter adjustment lens on its human eye side, the diopter adjustment lens being a myopia lens or a hyperopia lens worn at the human eye;

[0005] The optical display system further includes a second phase delay unit, which is located in the optical path between the light-emitting side of the linear polarizer and the diopter adjustment lens.

[0006] Optionally, the second phase retarder is disposed between the second lens and the linear polarizer; or,

[0007] The second phase delayer is disposed on the side of the second lens away from the linear polarizer.

[0008] Optionally, both the first phase delayer and the second phase delayer are quarter-wave plates.

[0009] Optionally, the second phase delayer is configured to convert linearly polarized light from the linear polarizer into circularly polarized light that propagates toward the human eye, and to convert circularly polarized light, whose rotation direction is reversed after reflection by the diopter adjustment lens, into linearly polarized light whose polarization direction is perpendicular to the transmission axis of the linear polarizer.

[0010] The linear polarizer is configured to absorb linearly polarized light perpendicular to its polarization direction in order to block the optical path that forms stray light.

[0011] Optionally, the second phase delayer is laminated to the surface of the linear polarizer facing away from the reflective polarizer.

[0012] Optionally, the second phase delayer is laminated and attached to either surface of the second lens.

[0013] Optionally, the second phase delay is configured to fit onto the diopter-adjusting lens.

[0014] Optionally, the optical display system further includes a display screen located on the image source side of the first lens, the display screen being used to provide light for imaging display;

[0015] The beam splitter is a semi-transparent and semi-reflective film, which is disposed on the surface of the first lens near the display screen.

[0016] Optionally, the first phase delayer, the reflective polarizer, and the linear polarizer are stacked sequentially to form a composite optical film, which is disposed between the first lens and the second lens.

[0017] Optionally, the optical display system further includes an anti-reflection coating disposed on the surface of the second phase retarder near the diopter adjustment lens.

[0018] Secondly, embodiments of this application provide an optical device, the optical device comprising:

[0019] The outer shell; and,

[0020] The optical display system as described in the first aspect.

[0021] The beneficial effects of this application are as follows:

[0022] The optical display system provided in this application provides a second phase delay device by adding a phase delay device in the optical path between the light-emitting side of the linear polarizer of the optical display system and the diopter adjustment lens (such as a myopia or hyperopia lens worn by the human eye). This effectively changes the polarization state of the light reflected by the diopter adjustment lens, so that the reflected light is absorbed by the linear polarizer in the optical path, thereby blocking the optical path that forms stray light. This significantly reduces stray light generated by wearing glasses and improves the display quality and user experience of the optical device.

[0023] Other features and advantages of this specification will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of this specification and, together with their description, serve to explain the principles of this specification.

[0025] Figure 1 This is one of the traditional optical structures and optical path diagrams of folded optical paths (without wearing glasses);

[0026] Figure 2 This is one of the traditional optical structures and optical path diagrams of folded optical paths (when wearing glasses);

[0027] Figure 3 This is a schematic diagram of the optical structure and optical path of an optical display system provided in an embodiment of this application.

[0028] Explanation of reference numerals in the attached figures:

[0029] 1. Display screen; 2. Beam splitter;

[0030] 3. First lens; 31. First surface; 32. Second surface;

[0031] 4. First phase retarder; 5. Reflection polarizer; 6. Linear polarizer;

[0032] 7. Second lens; 71. Third surface; 72. Fourth surface;

[0033] 8. Diopter adjustment lens; 9. Second phase delay device;

[0034] 01. Polarizing film; 02. Polarizing reflective film; 03. Quarter-wave plate; 04. Screen; 05. Semi-transparent and semi-reflective film; 06. First lens; 07. Second lens. Detailed Implementation

[0035] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0036] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0037] Technologies and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such technologies and equipment should be considered part of the specification.

[0038] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0040] The optical display system and optical device provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0041] According to one embodiment of this application, an optical display system is provided, see [link to relevant documentation]. Figure 3 The optical display system includes a beam splitter 2, a first lens 3, a first phase retarder 4, a reflective polarizer 5, a linear polarizer 6, and a second lens 7 arranged sequentially from the image source side to the human eye side; wherein, the optical display system is configured to have a diopter adjustment lens 8 on its human eye side, the diopter adjustment lens 8 being a myopia lens or hyperopia lens worn at the human eye; the optical display system also includes a second phase retarder 9, and the second phase retarder 9 is located in the optical path between the light-emitting side of the linear polarizer 6 and the diopter adjustment lens 8.

[0042] The optical display system provided in this application is an innovative solution designed for people who wear glasses (including myopia lenses and hyperopia lenses), as described in detail below.

[0043] See Figure 3The optical display system provided in this application embodiment comprises, from the image source side (the side where the display screen 1 is located) to the human eye side (the side where the human eye is located), a beam splitter 2, a first lens 3, a first phase retarder 4, a reflective polarizer 5, a linear polarizer 6, and a second lens 7, arranged sequentially. Simultaneously, a diopter adjustment lens 8 is configured on the human eye side. This diopter adjustment lens 8 is designed for users wearing myopia or hyperopia lenses (at the human eye) to meet the usage needs of users with different vision conditions and ensure they can clearly see the displayed content. Furthermore, a second phase retarder 9 is introduced into the entire optical display system. The position of the second phase retarder 9 is designed in the optical path between the light-emitting side of the linear polarizer 6 and the diopter adjustment lens 8. This design is key to solving the stray light problem for people wearing glasses.

[0044] In existing folded optical path VR optical devices, see Figure 1 The optical film structure is mainly composed of a polarizing film 01 (LP, Linear Polaizer), a polarizing reflective film 02 (RP, Reflective Polarizer), and a quarter-wave plate 03 (QWP). Ideally, such as... Figure 1 As shown, the linearly polarized light emitted by the optical display system directly enters the human eye for imaging. However, since many VR optical devices do not have myopia or hyperopia adjustment functions, users need to wear glasses or contact lenses to experience them. In this scenario, the light that should have entered the human eye (O1) is reflected when it reaches the surface of the glasses, and the reflected polarized light can directly enter the VR optical system. See also Figure 2 These reflected rays undergo multiple reflections and propagation within the VR optical system, eventually re-entering the human eye as stray light. The presence of stray light significantly degrades display quality, interferes with the user's visual experience, and causes problems such as image blurring and ghosting.

[0045] To elaborate further, see Figure 1 The light path shown is as follows: The imaging light emitted from the screen 04 passes through the semi-transparent and semi-reflective film 05 and enters the first lens 06. After passing through the quarter-wave plate 03 (QWP) and the polarizing reflective film 02 (RP), it is reflected back to the first lens 06. After being reflected again by the semi-transparent and semi-reflective film 05, it reaches the quarter-wave plate 03 (QWP) and the polarizing reflective film 02 (RP), and finally passes through the polarizing film 01 (LP) and enters the human eye, so that the human eye can see the image.

[0046] See Figure 2 The optical path shown in the figure: Figure 2In the upper middle part, the propagation path of the imaging light rays emitted from screen 04, i.e., the solid black lines, is... Figure 1 Consistent with the above. At this time, refer to the polarization direction. Figure 2 As shown, when the imaging light rays hit the lens of the spectacle at the human eye, they are reflected, and the polarization direction remains unchanged, as... Figure 2 The stray light is formed by the propagation path of the dashed arrow and eventually enters the human eye.

[0047] This application focuses on the stray light problem encountered by people who wear glasses (including myopia and hyperopia lenses) when using VR optical devices. It overcomes this problem by adding a second phase delay unit 9 at a key location in the optical display system. Figure 2 This application addresses the technical challenge of stray light affecting display quality caused by wearing glasses. Specifically, in traditional VR optical devices with folded optical paths, the lack of myopia adjustment functionality necessitates users wearing glasses. In this case, light that should have entered the eye is reflected by the diopter adjustment lens 8, and the altered polarization allows it to re-enter the optical display system, propagating through multiple reflections and forming stray light that interferes with normal imaging and reduces display quality. The second phase delayer 9 added in this application cleverly alters the polarization state of the light reflected by the diopter adjustment lens 8, causing the reflected light to be absorbed by a linear polarizer, blocking the path that forms stray light, and effectively solving this long-standing stray light problem for people who wear glasses.

[0048] The specific implementation process of this application is as follows, see below. Figure 3 When linearly polarized light from the linear polarizer 6 passes through the second phase retarder 9, it is converted into circularly polarized light and propagates towards the human eye. When this circularly polarized light encounters the diopter adjustment lens 8 (for nearsightedness or farsightedness) and is reflected, its polarization state is reversed. When the reflected circularly polarized light passes through the second phase retarder 9 again, it is converted into linearly polarized light with a polarization direction perpendicular to the transmission axis of the linear polarizer 6. Since the linear polarizer 6 only allows light with a specific polarization direction to pass through, this linearly polarized light with a perpendicular polarization direction is absorbed by the linear polarizer 6 and cannot re-enter the module to form stray light. This technical solution significantly reduces stray light generated by wearing glasses and reduces the interference of stray light on normal imaging light.

[0049] The optical display system provided in this application includes a folded optical path assembly. Specifically, see... Figure 3 The folded optical path assembly includes, for example, one or more lenses, as well as optical elements such as a beam splitter 2, a first phase delayer 4, a reflective polarizer 5, and a linear polarizer 6.

[0050] The beam-splitting element 2 is, for example, a thin film or coating with specific beam-splitting characteristics, which can be used to reflect and transmit incident light in a certain proportion. Specifically, the beam-splitting element 2 used in this application is a semi-transparent and semi-reflective film, which allows a portion of the light to be transmitted and another portion to be reflected.

[0051] It should be noted that the reflectivity and transmittance of the beam splitter 2 can be flexibly adjusted according to specific needs, and this embodiment does not impose any restrictions on this.

[0052] The first phase retarder 4 can be used to change the polarization state of light, for example, to convert linearly polarized light into circularly polarized light, or to convert circularly polarized light into linearly polarized light. Specifically, the first phase retarder 4 used in this application is a quarter-wave plate (QWP), which is located in the optical path between the beam splitter 2 and the reflective polarizer 5. It ensures that the light is correctly reflected or transmitted in subsequent paths by adjusting the phase of the light.

[0053] The reflective polarizer 5 is an optical device that reflects horizontally linearly polarized light and transmits vertically linearly polarized light, or any other optical device that reflects linearly polarized light at a specific angle and transmits linearly polarized light perpendicular to that angle. In other words, the reflective polarizer 5 is responsible for reflecting or transmitting light according to its polarization state. In this application, it interacts with a specific state of polarization (such as S-polarized light or P-polarized light) to achieve specific path control of the light. Specifically, the reflective polarizer 5 used in this application is, for example, a reflective polarizer (RP).

[0054] The function of the linear polarizer 6 is mainly reflected in the following two aspects:

[0055] (1) Basic polarization function;

[0056] As one of the optical components of an optical display system, the linear polarizer 6 works in conjunction with the reflective polarizer 5, the first phase retarder 4, and the second phase retarder 9 to jointly construct the polarization state conversion system required for the folded optical path. It allows light with a specific polarization direction to pass through while blocking vertically polarized light, providing the system with polarization selectivity.

[0057] (2) Stray light blocking function;

[0058] When used by a user wearing glasses, the reflected light, after being converted by the second phase delayer 9, becomes polarized perpendicular to the transmission axis of the linear polarizer 6. At this time, the linear polarizer 6 absorbs this perpendicularly polarized light, completely blocking the path of stray light returning to the optical display system. This mechanism significantly reduces the energy of stray light entering the eye, thereby significantly improving display clarity.

[0059] The optical display system provided in this application includes a first lens 3 and a second lens 7. However, it should be noted that these two lenses are only typical component examples in the composition of the optical display system. The optical display system of this application actually includes, but is not limited to, the above two lens structures. The number, type and arrangement of the lenses can be expanded or adjusted according to specific optical design requirements.

[0060] The optical display system provided in this application provides a second phase delay 9 by adding a phase delay device (i.e., a second phase delay 9) to the optical path between the light-emitting side of the linear polarizer 6 and the diopter adjustment lens 8 (e.g., a myopia or hyperopia lens worn by the human eye). This effectively changes the polarization state of the light reflected by the diopter adjustment lens 8, causing the reflected light to be absorbed by the linear polarizer 7 in the optical path, thereby blocking the optical path that forms stray light. This significantly reduces stray light generated by wearing glasses, improving the display quality of the optical device and the user experience.

[0061] By blocking stray light paths, the light entering the human eye is purified, greatly improving the display quality of VR optical devices. Users will enjoy a clearer and more comfortable visual experience, and problems such as image blurring and ghosting are effectively resolved.

[0062] In some examples of this application, the second phase retarder 9 is disposed between the second lens 7 and the linear polarizer 6; or, see [link to application]. Figure 3 The second phase delayer 9 is disposed on the side of the second lens 7 away from the linear polarizer 6.

[0063] In the examples provided in this application, different schemes are offered for the placement of the second phase delayer 9, all of which are designed around how to more effectively reduce stray light generated when people wearing glasses use VR devices.

[0064] The second phase retarder 9 can be disposed between the linear polarizer 6 and the second lens 7. With the second phase retarder 9 positioned here, linearly polarized light from the linear polarizer 6 immediately enters the second phase retarder 9. The second phase retarder 9 converts the linearly polarized light into circularly polarized light. This circularly polarized light continues to propagate through the second lens 7 to the diopter adjustment lens 8 where it is reflected. The polarization state of the reflected circularly polarized light is reversed, and when it passes through the second phase retarder 9 again, it is converted back into linearly polarized light perpendicular to the transmission axis of the linear polarizer 6, thereby being absorbed by the linear polarizer 6 and blocking the path of stray light formation.

[0065] The second phase retarder 9 can be disposed on the side of the second lens 7 away from the linear polarizer 6, see [reference]. Figure 3 When the second phase retarder 9 is in this position, the light first passes through the linear polarizer 6, then through the second lens 7, and finally reaches the second phase retarder 9. At this time, the second phase retarder 9 adjusts the polarization state of the light about to be incident on the diopter-adjusting lens 8 (glasses), converting it into circularly polarized light. When the reflected circularly polarized light passes through the second phase retarder 9 again, the polarization state will also reverse, and it will be converted back into linearly polarized light perpendicular to the transmission axis of the linear polarizer 6. However, since the light needs to pass through the second lens 7 again to reach the linear polarizer 6, the potential influence of the second lens 7 on the polarization state (such as introducing additional phase delay or polarization loss) must be considered in the design to ensure that the overall system can still effectively block stray light. This scheme can also achieve the effect of the reflected light being absorbed by the linear polarizer 6.

[0066] Based on the material properties of the second lens 7 or the overall layout requirements of the system, this application can select a more suitable position to place the second phase delayer 9, while still maintaining effective suppression of stray light.

[0067] Regardless of whether the second phase delayer 9 is positioned between the second lens 7 and the linear polarizer 6, or the second lens 7 is positioned away from the linear polarizer 6, its core purpose is to adjust the polarization state of light so that the light reflected by the diopter adjustment lens 8 cannot re-enter the optical display system to form stray light, thereby significantly improving the display quality of optical VR devices in scenarios where glasses are worn, and providing users with a clearer and more comfortable visual experience.

[0068] In some examples of this application, both the first phase delayer 4 and the second phase delayer 9 are quarter-wave plates (QWP).

[0069] A quarter-wave plate (QWP) is an optical element capable of converting linearly polarized light into circularly polarized light (or vice versa). Its key characteristic is that when linearly polarized light passes through a quarter-wave plate (QWP), its polarization state changes from linear to left- or right-hand circularly polarized light; and when circularly polarized light passes through a quarter-wave plate (QWP) again, it reverts to linear polarization, but its polarization direction rotates by 90° (i.e., perpendicular to the original direction). In this application, this characteristic provides the basis for eliminating stray light.

[0070] In the optical display system provided in this application, the first phase retarder 4 (quarter-wave plate, QWP) is typically located between the reflective polarizer 5 (RP, reflective polarizing film) and the beam splitter 2 (such as a semi-transparent and semi-reflective film). Its functions include: converting linearly polarized light from the display screen 1 into circularly polarized light, ensuring the stability of the polarization state of the light during reflection; and working in conjunction with the reflective polarizer 5 to optimize optical path efficiency and reduce energy loss.

[0071] In the optical display system provided in this application, the second phase delayer 9 (quarter-wave plate, QWP) is the core innovation. Its placement is flexible (such as between the linear polarizer 6 and the second lens 7, or outside the second lens 7), and it mainly solves the problem of stray light when wearing glasses.

[0072] When a user wears glasses, the linearly polarized light that should enter the eye may retain its polarization state after reflection from the lens surface, causing the reflected light to re-enter the optical display system and form stray light. The elimination principle of the second phase retarder 9 (quarter-wave plate, QWP) is as follows: After the linearly polarized light from the linear polarizer 6 passes through the second phase retarder 9 for the first time, it is converted into circularly polarized light. After reflection from the surface of the diopter-adjusting lens 8, the circularly polarized light reverses its rotation direction (left-handed becomes right-handed, or vice versa). When the reflected circularly polarized light passes through the second phase retarder 9 again (for the second time), it is converted into linearly polarized light perpendicular to the transmission axis of the linear polarizer 6. This perpendicularly polarized light is absorbed by the linear polarizer 6 and cannot enter the eye, thus eliminating stray light.

[0073] By switching twice using the second phase retarder 9, the polarization state of the reflected light is completely changed, preventing it from passing through the linear polarizer 6, thus reducing stray light energy by approximately 1.25%. This reduces the interference of stray light on normal imaging light, resulting in purer light entering the eye and a clearer image.

[0074] By designing the first phase retarder 4 and the second phase retarder 9 as quarter-wave plates, stray light from people wearing glasses is effectively suppressed by controlling the polarization state conversion of light. This design not only improves the display quality of VR optical devices but also takes into account the flexibility and versatility of optical display system design, providing a better visual experience for nearsighted / farsighted users.

[0075] See some examples in this application. Figure 3The second phase delayer 9 is configured to convert linearly polarized light from the linear polarizer 6 into circularly polarized light propagating toward the human eye, and to convert circularly polarized light, whose rotation is reversed after reflection by the diopter adjustment lens 8, into linearly polarized light with a polarization direction perpendicular to the transmission axis of the linear polarizer 6. The linear polarizer 6 is configured to absorb this linearly polarized light with a polarization direction perpendicular to it, thereby blocking the light path that forms stray light.

[0076] The core of this example is to directly block stray light generated when wearing glasses through the synergistic effect of the second phase delayer 9 (quarter-wave plate, QWP) and the linear polarizer 6 (RP, reflective polarizer). The specific process is as follows.

[0077] The function of the second phase delayer 9:

[0078] First conversion (outgoing light): Linearly polarized light (fixed polarization direction) from the linear polarizer 6 is converted into circularly polarized light (left-handed or right-handed) after passing through the second phase retarder 9, and propagates towards the human eye (diopter adjustment lens 8). For example, if the linearly polarized light is horizontal, it becomes left-handed circularly polarized light after passing through the second phase retarder 9 for the first time.

[0079] Second conversion (reflected light): After the circularly polarized light reaches the surface of the glasses (adjustable lens 8) and is reflected, its polarization direction is reversed (left-handed becomes right-handed, or right-handed becomes left-handed). When the reflected circularly polarized light passes through the second phase retarder 9 again, it is converted back into linearly polarized light, but the polarization direction is perpendicular to the original linearly polarized light. For example, the original horizontal direction becomes the vertical direction, see [reference needed]. Figure 3 .

[0080] The function of the linear polarizer 6 is:

[0081] The linear polarizer 6 only allows linearly polarized light in a specific direction (such as the horizontal direction) to pass through, while linearly polarized light in the vertical direction is completely absorbed. Therefore, the vertically polarized light returning from the second phase retarder 9 cannot pass through the linear polarizer 6 and is directly blocked, thus preventing it from entering the optical display system and forming stray light.

[0082] The light that was originally reflected back to the optical display system by the glasses (diopter adjustment lens 8) is converted twice by the second phase delayer 9, and its polarization direction is changed to be perpendicular to the transmission axis of the linear polarizer 6, thus being absorbed. The light entering the human eye is purer, reducing problems such as image blurring and ghosting, and providing a clearer and more comfortable visual experience for the user.

[0083] In some examples of this application, the second phase delayer 9 is laminated to the surface of the linear polarizer 6 facing away from the reflective polarizer 5.

[0084] The second phase retarder 9 (quarter-wave plate, QWP) can be directly attached to the surface of the linear polarizer 6 (LP) away from the reflective polarizer 5 (RP), thereby forming a stacked structure of the second phase retarder 9 and the linear polarizer 6. This direct attachment design of the second phase retarder 9 to the linear polarizer 6 achieves two major technical advantages:

[0085] (1) Compact structure: Eliminating the physical gap between the second phase delayer 9 and the linear polarizer 6 significantly shortens the optical path and reduces system complexity and assembly accuracy requirements;

[0086] (2) Stray light suppression: Reduce the number of reflective surfaces between components to block multiple reflection paths of stray light in the optical system from the source, and avoid image quality degradation problems such as ghosting and glare caused by interface reflection.

[0087] See some examples in this application. Figure 3 The second phase delayer 9 is laminated and attached to any surface of the second lens 7.

[0088] In a specific example, see Figure 3 The second phase retarder 9 is stacked and bonded to the surface of the second lens 7 near the diopter adjusting lens 8. In this optical design, the linearly polarized light first passes through the linear polarizer 6, then the second lens 7, and finally enters the second phase retarder 9, where it is converted into circularly polarized light before propagating towards the diopter adjusting lens 8. After being reflected by the diopter adjusting lens 8, the circularly polarized light undergoes a reversal of polarization and, upon passing through the second phase retarder 9 again, is converted back into vertically polarized light. The second lens 7 has no significant effect on the polarization state; the vertically polarized light is absorbed by the subsequent linear polarizer 6.

[0089] The second phase delayer 9 can be attached to any surface of the second lens 7, a design that can adapt to different optical system design requirements (such as space constraints or component arrangement).

[0090] In some examples of this application, the second phase delayer 9 is configured to be attachable to the diopter-adjusting lens 8.

[0091] Alternatively, the second phase delayer 9 can be designed to be directly integrated into the surface of the diopter-adjusting lens 8 (such as a myopia / hyperopia lens) to form a composite structure of the second phase delayer 9 and the diopter-adjusting lens 8.

[0092] At this point, the linearly polarized light, after passing through the linear polarizer 6 and the second lens 7, directly enters the second phase retarder 9 attached to the diopter adjustment lens 8 and is converted into circularly polarized light. After being reflected by the diopter adjustment lens 8, the circularly polarized light undergoes a reversal of rotation and, upon passing through the second phase retarder 9 again, is converted back into vertically polarized light. Since vertically polarized light cannot pass through the preceding linear polarizer 6, stray light is blocked.

[0093] The second phase delayer 9 is directly integrated into the diopter adjustment lens 8, eliminating the need to modify the internal optical structure of the VR optical device and thus improving adaptability. The VR optical device can maintain its original optical architecture, and stray light can be eliminated simply by the user wearing custom glasses with the second phase delayer 9 integrated.

[0094] Regardless of whether the second phase delayer 9 is attached to the linear polarizer 6, the second lens 7, or the diopter adjustment lens 8, its core objective is to precisely control the polarization state of the reflected light, causing it to be absorbed by the linear polarizer 6, thereby completely blocking the path of stray light formation. This design improves the display clarity of VR optical devices in scenarios where glasses are worn, providing users with a better visual experience.

[0095] See some examples in this application. Figure 3 The optical display system further includes a display screen 1, which is located on the image source side of the first lens 3 and is used to provide light for imaging display. The beam splitter 2 is a semi-transparent and semi-reflective film, which is disposed on the surface of the first lens 3 near the display screen 1.

[0096] In this application, the display screen 1 serves as an imaging light source, located on the image source side of the optical display system, and is responsible for emitting imaging light containing image information.

[0097] In this application, the first lens 3 is disposed close to the display screen 1, and it is close to the surface of the display screen 1 (i.e., Figure 3 The first surface 31 shown is coated with a beam-splitting element 2 (such as a semi-transparent and semi-reflective film).

[0098] A semi-reflective film is an optical thin film that can partially reflect and partially transmit incident light (typically a reflectivity / transmittance ratio of 50:50, but can be adjusted as needed).

[0099] In this application, by directly integrating the beam-splitting element 2 (semi-transparent and semi-reflective coating) onto the surface of the first lens 3, the need for a separate optical support is eliminated. Traditional optical solutions require additional support structures such as brackets, while the optical solution of this application directly utilizes the first lens 3 as a coating carrier, reducing the number of optical elements, lowering the overall weight of the system, and significantly improving the wearing comfort of VR optical devices.

[0100] Furthermore, the optical display system provided in this application embodiment may have a protective glass disposed on the light-emitting surface of the display screen 1. Specifically, the protective glass in front of the display screen 1 can effectively isolate external dust, fingerprints, and other contaminants, thereby keeping the surface of the display screen 1 clean. This is crucial for the optical display system, as any dirt on the screen surface can affect light transmission and image quality. By introducing a protective glass with a certain thickness, the tolerance of the optical module to dirt on the surface of the display screen 1 is significantly improved, ensuring the stability and reliability of the optical module.

[0101] The protective glass not only isolates dirt and grime but also effectively prevents the display screen 1 from being scratched, bumped, or otherwise physically damaged. This is of great significance for extending the service life of the display screen 1 and improving the overall durability of the device.

[0102] See some examples in this application. Figure 3 The first phase delayer 4, the reflective polarizer 5, and the linear polarizer 6 are stacked in sequence to form a composite optical film, which is disposed between the first lens 3 and the second lens 7.

[0103] In this application, the composite film material is simply bonded to the lens surface using an optical adhesive (OCA), simplifying the system assembly process.

[0104] Optionally, the first lens 3 and the second lens 7 can be bonded together. In this case, the composite optical film can be directly bonded between the first lens 3 and the second lens 7.

[0105] Of course, a certain air gap can also be maintained between the first lens 3 and the second lens 7. In this case, the composite optical film can be disposed on the surface of the first lens 3 near the second lens 7, or on the surface of the second lens 7 near the first lens 3.

[0106] In some examples of this application, the optical display system further includes an anti-reflection coating disposed on the side surface of the second phase retarder 9 near the diopter adjustment lens 8.

[0107] In the example provided in the application, the antireflective coating is disposed on the side surface of the second phase retarder 9 (quarter-wave plate, QWP) near the diopter adjustment lens 8 (such as an eyeglass lens). This design achieves a dual improvement in stray light suppression and image quality by optimizing interface reflection characteristics and polarization path control.

[0108] Specifically, in traditional folded optical path VR optical systems, light emitted from the screen must pass through multiple layers of optical elements, each with reflective surfaces. Taking the second phase retarder 9 as an example, its surface near the diopter adjustment lens 8 will experience some reflection due to the abrupt change in refractive index of the air-film layer. If no suppression measures are taken, the reflected light will propagate backward along the original optical path, causing stray light superposition and decreased contrast. By adding an anti-reflection film to the surface of the second phase retarder 9, the interface reflectivity near the diopter adjustment lens 8 will significantly decrease, and stray light energy will be significantly reduced.

[0109] The optical display system provided in this application will be described below through a specific embodiment.

[0110] The optical display system provided in this application is described in [reference]. Figure 3 The optical display system includes a display screen 1, a beam splitter 2, a first lens 3, a first phase delayer 4, a reflective polarizer 5, a linear polarizer 6, a second lens 7, a second phase delayer 9, and a diopter adjustment lens 8 arranged sequentially from the image source side to the human eye side. The diopter adjustment lens 8 is a myopia lens or hyperopia lens worn at the human eye.

[0111] The display screen 1 is used to provide light for imaging display; the beam splitter 2 is a semi-transparent and semi-reflective film, which is disposed on the first surface 31 of the first lens 3; the first phase retarder 4, the reflective polarizer 5, and the linear polarizer 6 are stacked in sequence to form a composite optical film, which is disposed between the first lens 3 and the second lens 7; the second phase retarder 9 is disposed on the fourth surface 72 of the second lens 7;

[0112] It should be noted that the composite optical film can be bonded between the first lens 3 and the second lens 7, or it can be disposed on the second surface 32 of the first lens 3, or it can be disposed on the third surface 71 of the second lens 7.

[0113] Among them, the beam splitter 2 is a semi-transparent and semi-reflective film, the first phase delayer 4 and the second phase delayer 9 are both quarter-wave plates, the reflective polarizer 5 is a reflective polarizing film, and the linear polarizer 6 is an absorptive polarizing film.

[0114] Alternatively, an anti-reflective coating can be provided on the surface of the second phase delayer 9 near the diopter adjustment lens 8.

[0115] The optical path design for suppressing stray light in the optical display system provided in this application is as follows:

[0116] The second phase delayer 9 converts the linearly polarized light from the linear polarizer 6 into circularly polarized light that propagates toward the human eye, and converts the circularly polarized light, which has its rotation reversed after being reflected by the diopter adjustment lens 8, into linearly polarized light whose polarization direction is perpendicular to the transmission axis of the linear polarizer 6; the linear polarizer 6 absorbs this linearly polarized light with its polarization direction perpendicular to the transmission axis, thereby blocking the light path that forms stray light.

[0117] According to another embodiment of this application, an optical device is provided, the optical device including the near-eye optical display system as described above.

[0118] The optical devices provided in this application embodiment are, for example, VR optical devices, such as VR glasses or VR helmets.

[0119] The specific implementation of the optical display device in this application can refer to the various embodiments of the near-eye optical display system described above. Therefore, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here.

[0120] The above embodiments mainly describe the differences between the various embodiments. As long as the different optimization features between the various embodiments are not contradictory, they can be combined to form a better embodiment. For the sake of brevity, they will not be elaborated here.

[0121] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. An optical display system, characterized in that, The system includes a beam splitter (2), a first lens (3), a first phase retarder (4), a reflective polarizer (5), a linear polarizer (6), and a second lens (7) arranged sequentially from the image source side to the human eye side; wherein the optical display system is configured to have a diopter adjustment lens (8) on its human eye side, and the diopter adjustment lens (8) is a myopia lens or hyperopia lens worn at the human eye; The optical display system further includes a second phase delay unit (9), and the second phase delay unit (9) is located in the optical path between the light-emitting side of the linear polarizer (6) and the diopter adjustment lens (8).

2. The optical display system according to claim 1, characterized in that, The second phase retarder (9) is disposed between the second lens (7) and the linear polarizer (6); or, The second phase delay (9) is disposed on the side of the second lens (7) away from the linear polarizer (6).

3. The optical display system according to claim 1 or 2, characterized in that, Both the first phase delayer (4) and the second phase delayer (9) are quarter-wave plates.

4. The optical display system according to claim 3, characterized in that, The second phase delayer (9) is configured to convert linearly polarized light from the linear polarizer (6) into circularly polarized light that propagates toward the human eye, and to convert circularly polarized light that has its rotation reversed after being reflected by the diopter adjustment lens (8) into linearly polarized light whose polarization direction is perpendicular to the transmission axis of the linear polarizer (6). The linear polarizer (6) is configured to absorb linearly polarized light perpendicular to the polarization direction in order to block the light path that forms stray light.

5. The optical display system according to claim 2, characterized in that, The second phase delayer (9) is stacked and bonded to the surface of the linear polarizer (6) on the side away from the reflective polarizer (5).

6. The optical display system according to claim 2, characterized in that, The second phase delayer (9) is laminated and attached to any surface of the second lens (7).

7. The optical display system according to claim 2, characterized in that, The second phase delay (9) is configured to fit onto the diopter adjustment lens (8).

8. The optical display system according to claim 1, 5, 6 or 7, characterized in that, The optical display system further includes a display screen (1), which is located on the image source side of the first lens (3) and is used to provide light for imaging display; The beam splitter (2) is a semi-transparent and semi-reflective film, which is disposed on the side surface of the first lens (3) near the display screen (1).

9. The optical display system according to claim 1, 5, 6 or 7, characterized in that, The first phase delayer (4), the reflective polarizer (5) and the linear polarizer (6) are stacked in sequence to form a composite optical film, which is disposed between the first lens (3) and the second lens (7).

10. The optical display system according to claim 2, characterized in that, The optical display system further includes an anti-reflective coating disposed on the side surface of the second phase retarder (9) near the diopter adjustment lens (8).

11. An optical device, characterized in that, include: shell; as well as, The optical display system as described in any one of claims 1-10.

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