Methods, systems, and optical modules for reducing ghosting in optical modules

Abstract

This application provides a method, system, and optical module for reducing ghosting in an optical module. The optical module includes a screen, a first composite film, a beam splitter, and a second composite film. The screen emits light, which is reflected by the second composite film after passing through the first composite film and the beam splitter, then reflected again by the first composite film after passing through the beam splitter, and finally emitted as ghost light after passing through the beam splitter and the second composite film. The method includes: acquiring the ghost light intensity and the target light intensity of the optical module; determining the ghost rate of the optical module based on the ghost light intensity and the target light intensity; determining whether the ghost rate is ≤ a preset threshold; if the ghost rate is greater than the preset threshold, adjusting the transmittance / reflection ratio of the beam splitter until the ghost rate is ≤ the preset threshold.

Description

Technical Field

[0001] This application relates to the field of optical display technology, and more specifically, to a method for reducing ghosting in an optical module, a system for reducing ghosting in an optical module, and an optical module for reducing ghosting. Background Technology

[0002] Optical modules provide users with simulations of visual, auditory, and tactile sensations, creating an immersive experience. They have wide applications in fields such as medicine, entertainment, military aerospace, interior design, real estate development, and rehabilitation training. The imaging quality of optical modules is a crucial factor affecting product quality; for example, severe ghosting when using optical modules will seriously impact the user's sense of immersion.

[0003] Currently, to effectively reduce ghosting intensity, common practices include controlling the reflectivity of anti-reflective (AR) films to extremely low levels or using ultra-low reflective film materials. However, both methods inevitably lead to a significant increase in material costs and a substantial increase in manufacturing complexity.

[0004] In view of this, it is necessary to provide a new technical solution to solve the above-mentioned technical problems. Summary of the Invention

[0005] The first objective of this application is to provide a new technical solution for reducing ghosting in optical modules.

[0006] The second objective of this application is to provide a new optical module technology solution for reducing ghosting.

[0007] The third objective of this application is to provide a new system technology solution for reducing optical module ghosting.

[0008] The fourth objective of this application is to provide a new technical solution for computer-readable storage media.

[0009] In a first aspect, embodiments of this application provide a method for reducing ghosting in an optical module. The optical module includes a screen, a first composite film, a beam splitter, and a second composite film;

[0010] The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light.

[0011] The method includes:

[0012] The ghost light intensity and target light intensity of the optical module are obtained;

[0013] The ghost rate of the optical module is determined based on the ghost light intensity and the target light intensity.

[0014] Determine whether the ghosting rate is ≤ a preset threshold;

[0015] If the ghosting rate is greater than a preset threshold, adjust the transmittance / reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold.

[0016] Optionally, the first composite film includes a first antireflective film, and the screen is provided with the first composite film. Specifically, obtaining the ghost light intensity of the optical module includes:

[0017] The ghost light intensity is determined based on the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter, and the reflectance of the first antireflective film.

[0018] Optionally, the ghost ray intensity = I*t*a*T 3 ;

[0019] Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectance of the first antireflection film, and T is the transmittance of the beam splitter.

[0020] Optionally, obtaining the target light intensity of the optical module specifically includes:

[0021] The target light intensity is determined based on the light transmittance of the first composite film, the intensity of the light emitted from the screen, and the transmittance and reflectance of the beam splitter.

[0022] Optionally, the target light intensity = I*t*T*R;

[0023] Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, T is the transmittance of the beam splitter, and R is the reflectance of the beam splitter.

[0024] Optionally, if the ghosting rate is greater than a preset threshold, the transmission-reflection ratio of the beam splitter is adjusted until the ghosting rate is less than or equal to the preset threshold, specifically including:

[0025] The reflectivity of the beam splitter is in the range of 40% to 60%. As the reflectivity of the beam splitter increases, the ghosting rate of the optical module decreases.

[0026] Optionally, the reflectivity of the beam splitter is in the range of 40% to 60%, and the ghosting rate of the optical module is in the range of 0.133% to 0.450%.

[0027] Optionally, if the ghosting rate is greater than a preset threshold, the transmission-reflection ratio of the beam splitter is adjusted until the ghosting rate is less than or equal to the preset threshold, specifically including:

[0028] The reflectivity of the beam splitter increases within the range of 40% to 50%. As the reflectivity of the beam splitter increases, the intensity of the target light increases and the intensity of the ghost light decreases.

[0029] The reflectivity of the beam splitter increases within the range of 50% to 60%. As the reflectivity of the beam splitter increases, the intensity of the target light and the intensity of the ghost light both decrease.

[0030] Optionally, when the reflectivity of the beam splitter is in the range of 50% to 60% and the reflectivity of the beam splitter increases from A to B, the ghost light intensity corresponding to the reflectivity A of the beam splitter is I1, the ghost light intensity corresponding to the reflectivity B of the beam splitter is I2, and the reduction rate of the ghost light intensity is c1 = (I1 - I2) / I2.

[0031] The target light intensity corresponding to the reflectivity A of the beam splitter is I3, and the target light intensity corresponding to the reflectivity B of the beam splitter is I4. The reduction rate of the target light intensity is c2 = (I3 - I4) / I4.

[0032] Wherein c1 is greater than c2.

[0033] Optionally, c1 is 10 to 15 times the value of c2.

[0034] Secondly, embodiments of this application also provide an optical module for reducing ghosting. The optical module includes a screen, a first composite film, a beam splitter, and a second composite film.

[0035] The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light.

[0036] The transmittance-to-reflectance ratio of the beam splitter is within a preset range to reduce the ghosting rate of the optical module.

[0037] Optionally, the preset range is between 2 / 3 and 3 / 2, the reflectivity of the beam splitter is between 40% and 60%, the ghosting rate of the optical module decreases as the reflectivity of the beam splitter increases, and the ghosting rate of the optical module ranges from 0.133% to 0.450%.

[0038] Optionally, the screen is used to emit light, which is transmitted through the first composite film and the beam splitter, then reflected by the second composite film, and then reflected again by the beam splitter and transmitted through the second composite film before being emitted as the target light.

[0039] Optionally, the reflectivity of the beam splitter is in the range of 40% to 50%. As the reflectivity of the beam splitter increases, the intensity of the target light increases and the intensity of the ghost light decreases. The ghost rate of the optical module is in the range of 0.250% to 0.450%.

[0040] The reflectivity of the beam splitter is in the range of 50% to 60%. As the reflectivity of the beam splitter increases, the intensity of the target light and the intensity of the ghost light both decrease. The ghost rate of the optical module ranges from 0.133% to 0.250%.

[0041] Optionally, the first composite film includes, along the optical axis from the human eye side to the screen side, a first antireflection film, a first phase retardation film, and a first linear polarizer in sequence; the second composite film includes, along the optical axis from the human eye side to the screen side, a second antireflection film, a second linear polarizer, a reflective polarizing element, and a second phase retardation film in sequence.

[0042] Optionally, the optical system further includes at least one lens located on either side of the first composite film, the beam splitter, and the second composite film.

[0043] Thirdly, embodiments of this application also provide a system for reducing optical module ghosting. The system for reducing optical module ghosting includes:

[0044] An optical module, comprising a screen, a first composite film, a beam splitter, and a second composite film;

[0045] The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light.

[0046] An acquisition module is used to acquire the ghost light intensity and the target light intensity of the optical module.

[0047] A calculation module is used to determine the ghosting rate of the optical module based on the ghosting light intensity and the target light intensity;

[0048] The comparison module is used to determine whether the ghosting rate is ≤ a preset threshold.

[0049] If the ghosting rate is greater than a preset threshold, the adjustment module is used to adjust the transmission-reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold.

[0050] Fourthly, embodiments of this application also provide a computer-readable storage medium storing computer instructions thereon, which, when executed by a processor, perform the method for reducing optical module ghosting as described in the first aspect.

[0051] According to embodiments of this application, by acquiring the ghost light intensity and the target light intensity, calculating the ghost rate, and adjusting the transmission-reflection ratio of the beam splitter based on the calculation results, ghosting in the optical module can be significantly reduced, thus improving image quality. Furthermore, reducing ghosting in the optical module by adjusting the transmission-reflection ratio of the beam splitter can lower costs and reduce operational complexity.

[0052] 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

[0053] 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.

[0054] Figure 1 The diagram shows a flowchart of a method for reducing optical module ghosting provided in an embodiment of this application.

[0055] Figure 2 The diagram shown is a structural architecture diagram of the optical module for reducing ghosting provided in an embodiment of this application.

[0056] Figure 3 The figure shows the relationship between the intensity of the target light and the reflectivity of the beam splitter.

[0057] Figure 4 The graph shown is a relationship between the intensity of the ghost light and the reflectivity of the beam splitter.

[0058] Figure 5 The graph shown is a relationship between ghosting rate and reflectivity of the beam splitter.

[0059] Explanation of reference numerals in the attached figures:

[0060] 1. Screen; 2. First antireflective coating; 3. Beam splitter; 4. First composite film; 5. Second composite film; 6. First lens; 7. Second lens. Detailed Implementation

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] This application provides a method for reducing ghosting in optical modules. Ghosting is typically caused by multiple reflections or scattering of light within the optical module. These reflections and scattering may originate from various interfaces within the optical module, such as the lens surface, filters, and beam splitters. Ghosting not only affects image quality but can also cause confusion and misinterpretation of image information.

[0067] The method provided in this application embodiment is specifically designed to reduce ghosting formed by an optical module using a beam splitter 3. This method reduces ghosting in the optical module and improves image quality by adjusting the transmittance-to-reflection ratio of the beam splitter 3. Exemplarily, the optical module is an optical module that generates a folded optical path.

[0068] Reference Figure 2 The optical module includes a screen 1, a first composite film 4, a beam splitter 3, and a second composite film 5. The first composite film 4 is positioned closer to the screen 1 than the beam splitter 3, and the beam splitter 3 is positioned closer to the screen 1 than the second composite film 5, meaning the beam splitter 3 is located between the first composite film 4 and the second composite film 5. The first composite film 4 can be considered as the composite film originally positioned on the display screen.

[0069] Specifically, such as Figure 2 As shown, screen 1 is used to emit light. The light passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, passes through the beam splitter 3 again, is reflected by the first composite film 4, and finally passes through the beam splitter 3 and the second composite film 5 before being emitted as ghost light.

[0070] It should be noted that, Figure 2 The optical architecture of the illustrated optical module is a basic architecture for realizing folded optical paths, which those skilled in the art can use to... Figure 2 Based on the existing architecture, additional film layers are added to achieve more complex folded optical paths. In different optical module architectures, the types and placement of the film layers will result in different ghosting ray paths. The above is just one example of a ghosting ray path based on a specific optical module architecture diagram.

[0071] Furthermore, although the ghosting ray path may vary depending on the optical architecture of the optical module, the method for reducing optical module ghosting provided in this application embodiment can be applied to the optical architecture of different optical modules.

[0072] Hereinafter, various embodiments and examples according to this application will be described with reference to the accompanying drawings.

[0073] <Method Implementation>

[0074] Reference Figure 1 Methods to reduce ghosting in optical modules include the following steps:

[0075] S1: Obtain the ghost light intensity and target light intensity of the optical module;

[0076] S2: Determine the ghosting rate of the optical module based on the ghosting light intensity and the target light intensity;

[0077] S3: Determine whether the ghost rate is ≤ a preset threshold;

[0078] S4: If the ghosting rate is greater than the preset threshold, adjust the transmission-reflection ratio of the beam splitter 3 until the ghosting rate is less than or equal to the preset threshold.

[0079] In step S1, the ghost light intensity refers to the light emitted from the screen 1, which is reflected by the second composite film 5 after passing through the first composite film 4 and the beam splitter 3, and then reflected by the first composite film 4 after passing through the beam splitter 3 again. Finally, the light emitted after passing through the beam splitter 3 and the second composite film 5 is the ghost light.

[0080] Target light intensity: refers to the light emitted from screen 1, which passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, is reflected again by the beam splitter 3, is transmitted through the second composite film 5, and is then emitted as the target light.

[0081] In one example, the intensity of the ghost ray can be measured using an optical measuring device, such as an optical power meter.

[0082] In one specific embodiment, the first composite film 4 includes a first antireflective film 2, and the screen 1 is provided with the first composite film 4. Obtaining the ghost light intensity of the optical module specifically includes:

[0083] The intensity of the ghost light is determined based on the transmittance of the first composite film 4, the intensity of the light emitted from the screen 1, the transmittance of the beam splitter 3, and the reflectance of the first antireflection film 2.

[0084] In this embodiment, by taking into account factors such as the transmittance of the first composite film 4, the intensity of the light emitted from the screen 1, the transmittance of the beam splitter 3, and the reflectivity of the first antireflection film 2, the intensity of ghost light in the optical module can be accurately calculated.

[0085] Specifically, the first composite film 4 typically comprises multiple thin films used to enhance the light transmittance, anti-reflection properties, or provide other optical characteristics of the screen 1. The transmittance of the first composite film 4 refers to the ratio of the intensity of light transmitted through the first composite film 4 to the intensity of the incident light when light passes through the screen 1.

[0086] The intensity of light emitted from screen 1 refers to the intensity of light emitted directly from the surface of screen 1. This can usually be measured directly using optical measuring equipment (such as a photometer). Alternatively, the intensity of light emitted from screen 1 can be determined based on the type of screen 1.

[0087] The transmittance of the beam splitter 3 refers to the ratio of the intensity of the transmitted light to the intensity of the incident light when light passes through the beam splitter 3. The transmittance of the beam splitter 3 depends on factors such as its material, thickness, and coating.

[0088] The primary function of the first antireflection coating 2 is to reduce the reflection of light of a specific wavelength and increase transmittance. However, under certain conditions (such as a specific incident angle or wavelength), the first antireflection coating 2 may also have a certain reflectivity. The reflectivity of the first antireflection coating 2 refers to the ratio of the intensity of the light reflected back from the surface of the first antireflection coating 2 to the intensity of the incident light.

[0089] Based on the above parameters, the intensity of the ghost ray can be calculated using the following formula:

[0090] Ghost light intensity = Light intensity emitted from screen 1 × Transmittance of first composite film 4 × Transmittance of beam splitter 3 n × The reflectivity of the first antireflection coating 2. Where n is the number of times the ghost light passes through the beam splitter 3. n is related to the specific architecture of the optical module.

[0091] It should be noted that the calculation of ghost light intensity needs to be combined with the specific optical module architecture. The calculation formula for ghost light intensity will be different depending on the architecture of the optical module.

[0092] In one specific embodiment, refer to Figure 2 According to the shown ghost ray path, the ghost ray passes through beam splitter 3 three times and is transmitted by beam splitter 3. The intensity of the ghost ray is I*t*a*T. 3 ;

[0093] Where I is the intensity of the light emitted from screen 1, t is the transmittance of the first composite film 4, a is the reflectance of the first antireflection film 2, and T is the transmittance of the beam splitter 3.

[0094] It should be noted that, without considering factors such as light reflection from the lens surface in the optical module, the ghost light intensity = I*t*a*T 3 The ideal light intensity for a ghost image.

[0095] In one example, the intensity of the target light can be obtained by measuring it with an optical measuring device, such as an optical power meter.

[0096] In one specific embodiment, the screen 1 is provided with a first composite film 4, and obtaining the target light intensity of the optical module specifically includes:

[0097] The target light intensity is determined based on the light transmittance of the first composite film 4, the light intensity emitted from the screen 1, and the transmittance and reflectance of the beam splitter 3.

[0098] In this embodiment, the first composite film 4 is a multi-layered thin film that light passes through when it is emitted from inside the screen 1 to the outside. The light transmittance of these films directly affects the intensity of the light emitted from the screen 1. If the composite film has high light transmittance, more light can pass through the film, and vice versa.

[0099] The intensity of light emitted from screen 1 indicates the strength of the light emitted by screen 1 itself. This intensity is affected by various factors such as the type of screen 1 and its brightness setting. The intensity of light emitted from screen 1 can be directly measured using optical measuring equipment (such as a photometer). Alternatively, the intensity of light emitted from screen 1 can be determined based on its type.

[0100] The beam splitter 3 in the optical module separates light rays, allowing some to pass through and others to be reflected. Transmittance and reflectance represent the proportion of light transmitted and reflected, respectively. These two parameters are crucial for determining the intensity of the target light rays.

[0101] To obtain the target light intensity, based on the optical module architecture and the parameters mentioned above, the target light intensity can be calculated using the following formula:

[0102] Target light intensity = Light intensity emitted from screen 1 × Transmittance of first composite film 4 × Transmittance of beam splitter 3 × Reflectance of beam splitter 3.

[0103] It should be noted that the calculation of target light intensity needs to be combined with the specific architecture of the optical module. The calculation formula for target light intensity will be different depending on the architecture of the optical module.

[0104] In a specific embodiment, such as Figure 2 The path of the target ray is shown, and the intensity of the target ray is I*t*T*R;

[0105] Where I is the intensity of light emitted from screen 1, t is the transmittance of the first composite film 4, T is the transmittance of the beam splitter 3, and R is the reflectance of the beam splitter 3.

[0106] It should be noted that, without considering other factors such as light reflection from the lens surface in the optical module, the target light intensity = I*t*T*R is the ideal target light intensity.

[0107] In step S2, the ghosting rate is defined as the ratio of the ghost light intensity to the target light intensity. This ratio reflects the relative intensity of the ghost light compared to the target light and is an important indicator for evaluating the degree of ghosting in an optical module.

[0108] In step S1, after obtaining the ghost light intensity and the target light intensity, the ghost rate can be calculated using the ghost light intensity and the target light intensity.

[0109] In step S3, a ghosting rate upper limit (preset threshold) is set according to the application scenario and imaging quality requirements of the optical module. When the ghosting rate is lower than or equal to this value, the ghosting level of the optical module is considered acceptable. When the ghosting rate is higher than this value, the ghosting level of the optical module is considered unacceptable.

[0110] It should be noted that the preset threshold is an upper limit value set by those skilled in the art based on the architecture of the optical module, its application scenario, and imaging quality requirements. This preset threshold is a percentage.

[0111] In step S4, according to a specific embodiment described above, the ghost light intensity = the light intensity emitted from screen 1 × the transmittance of the first composite film 4 × the transmittance of the beam splitter 3. n × The reflectivity of the first antireflection coating 2. It is evident that changing the transmission and reflection ratio of the beam-splitting element 3 can affect the intensity of the ghosting ray. Specific methods for adjusting the transmission and reflection ratio can include changing the material, thickness, and coating of the beam-splitting element 3.

[0112] It should be noted that in this embodiment, the beam splitter 3 can be detachably installed in the optical module. If the ghosting rate is greater than a preset threshold and the transmission-reflection ratio of the beam splitter 3 needs to be adjusted, this embodiment can adjust the transmission-reflection ratio of the beam splitter 3 by replacing it with a different type of beam splitter 3.

[0113] Furthermore, different types (models) of beam-splitting elements 3 have different transmission-reflection ratios. After the beam-splitting element 3 is manufactured, it has a definite transmission-reflection ratio. Therefore, the embodiments of this application can adjust the transmission-reflection ratio of the beam-splitting element 3 by replacing it with different types of beam-splitting elements 3.

[0114] Since reducing the ghosting rate is typically an iterative process, it requires repeatedly measuring or calculating the ghost light intensity and the target light intensity, recalculating the ghosting rate, and adjusting the transmission-reflection ratio of the beam splitter 3 based on the calculation results. This process may require multiple iterations until the ghosting rate meets the preset threshold requirement.

[0115] Therefore, in this embodiment, by acquiring the ghost light intensity and the target light intensity, calculating the ghost rate, and adjusting the transmission-reflection ratio of the beam splitter 3 based on the calculation results, ghosting in the optical module can be significantly reduced, improving imaging quality. Furthermore, reducing ghosting in the optical module by adjusting the transmission-reflection ratio of the beam splitter 3 can reduce cost and operational complexity. For example, by fabricating beam splitters 3 with different transmission-reflection ratios (fabricating beam splitters 3 with different transmission-reflection ratios is relatively easy), and applying beam splitters 3 with different transmission-reflection ratios to the optical module, ghosting in the optical module can be reduced, further reducing cost and operational complexity.

[0116] In a specific embodiment, such as Figure 2 The optical module shown includes a screen 1, a first lens 6, and a second lens 7. The second lens 7 is further away from the screen 1 than the first lens 6. A first composite film 4 is disposed on the side of the first lens 6 facing away from the screen 1. The first composite film 4 includes a first anti-reflective film 2 and is used to generate circularly polarized light.

[0117] A beam-splitting element 3 is disposed on the surface of the second lens 7 near the first lens 6. A second composite film 5 is disposed on the surface of the second lens 7 opposite to the first lens 6, and the second composite film 5 is used to generate a folded optical path.

[0118] In this specific optical module, the ghost ray intensity = I*t*a*T 3Where I is the intensity of the light emitted from screen 1, t is the transmittance of the first composite film 4, a is the reflectance of the first antireflection film 2, and T is the transmittance of the beam splitter 3. Target light intensity = I*t*T*R, where I is the intensity of the light emitted from screen 1, t is the transmittance of the first composite film 4, T is the transmittance of the beam splitter 3, and R is the reflectance of the beam splitter 3.

[0119] The settings are as follows: the reflectivity of the beam splitter 3 is R, the transmittance of the beam splitter 3 is T, the reflectivity of the first antireflection film 2 is a, the intensity of the light emitted from the screen 1 is I = 1, and the transmittance of the first composite film 4 is set to a fixed value t. Additionally, the reflectivity R of the beam splitter 3 is set as the independent variable, the transmittance of the beam splitter 3 is T = 1 - R, the reflectivity a of the first antireflection film 2 is a = 1, the intensity of the light emitted from the screen 1 is I = 1, and the transmittance of the first composite film 4 is t = 0.5.

[0120] As shown in Table 1, the different transmittance-to-reflection ratios of the beam splitter 3 result in different target light intensity, ghost light intensity, and ghost rate.

[0121] Table 1:

[0122]

[0123] Based on the above analysis, the ghosting of the optical module can be reduced by adjusting the transmittance-to-reflection ratio of the beam splitter 3.

[0124] In one specific embodiment, refer to Figure 5 If the ghosting rate is greater than a preset threshold, the transmission-reflection ratio of the beam splitter 3 is adjusted until the ghosting rate is less than or equal to the preset threshold, specifically including:

[0125] The reflectivity of the beam splitter 3 is in the range of 40% to 60%. As the reflectivity of the beam splitter 3 increases, the ghosting rate of the optical module decreases.

[0126] In this embodiment, the reflectivity of the beam-splitting element 3 is adjusted within the range of 40% to 60%. This range is selected based on the specific design requirements of the optical module and test feedback from practical applications.

[0127] For example, the reflectivity of the beam splitter 3 is less than 40%, resulting in a lower target light intensity and a higher ghost light intensity in the optical module. To ensure the target light intensity of the optical module, the reflectivity of the beam splitter 3 is set to ≥40%.

[0128] For example, the reflectivity of the beam splitter 3 is greater than 60%, and the intensity of the target light and the ghost light of the optical module are both low. Similarly, in order to ensure the intensity of the target light of the optical module, the reflectivity of the beam splitter 3 is set to ≤60%.

[0129] Within this range, as the reflectivity of the beam splitter 3 increases, the ghosting rate of the optical module decreases accordingly. This is because increasing reflectivity helps reduce multiple reflections of light within the module, thereby reducing ghosting.

[0130] Within the range of 40% to 60%, the reflectivity of the beam splitter 3 is gradually increased in increments (e.g., 1%, 2%, etc.). After each adjustment of the reflectivity, the ghost rate of the optical module and the target light intensity need to be remeasured. By analyzing the ghost rate data obtained from each measurement, it is observed whether it shows a decreasing trend with the increase of reflectivity.

[0131] When the ghosting rate drops below a preset threshold and the target light intensity remains within an acceptable range, the reflectivity value at this point is recorded as the optimal reflectivity. Those skilled in the art can incorporate a beam splitter 3 with this optimal reflectivity into the optical module to reduce ghosting in the optical module.

[0132] Therefore, in this embodiment, by adjusting the reflectivity of the beam splitter 3 and finding the optimal value within the range of 40% to 60%, the ghosting rate of the optical module can be effectively reduced while maintaining sufficient intensity of the target light.

[0133] Specifically, the reflectivity of the beam splitter 3 is in the range of 40% to 60%, and the ghosting rate of the optical module is in the range of 0.133% to 0.450%.

[0134] The reflectivity of beam-splitter 3 is 40%, and the ghosting rate of the optical module is 0.450%. When the reflectivity of beam-splitter 3 is 60%, the ghosting rate of the optical module is 0.133%. This means that as the reflectivity of beam-splitter 3 increases, the ghosting rate of the optical module decreases accordingly. This demonstrates that by adjusting the reflectivity of beam-splitter 3 and finding its optimal value within the range of 40% to 60%, the ghosting rate of the optical module can be effectively reduced.

[0135] In a more specific embodiment, refer to Figure 3 and Figure 4 If the ghosting rate is greater than a preset threshold, the transmission-reflection ratio of the beam splitter 3 is adjusted until the ghosting rate is less than or equal to the preset threshold, specifically including:

[0136] The reflectivity of the beam splitter 3 increases within the range of 40% to 50%. As the reflectivity of the beam splitter 3 increases, the intensity of the target light increases and the intensity of the ghost light decreases.

[0137] The reflectivity of the beam splitter 3 increases within the range of 50% to 60%. As the reflectivity of the beam splitter 3 increases, the intensity of the target light and the intensity of the ghost light both decrease.

[0138] In this embodiment, the reflectivity of the beam splitter 3 is adjusted within the range of 40% to 60%.

[0139] When reflectivity increases within the range of 40% to 50%, the intensity of the target light increases, while the intensity of the ghost light decreases. When reflectivity increases within the range of 50% to 60%, both the intensity of the target light and the intensity of the ghost light decrease.

[0140] Based on the above-mentioned variation pattern, if the ghosting rate is greater than the preset threshold and the current reflectivity is less than 50%, then consider increasing the reflectivity to reduce the ghosting light intensity and increase the target light intensity. If the ghosting rate is still greater than the preset threshold, but the current reflectivity is close to or exceeds 50%, then it is necessary to weigh the changes in target light intensity and ghosting light intensity, and adjust the reflectivity of the beam splitter 3 according to the requirement for target light intensity.

[0141] Therefore, in this embodiment, by adjusting the reflectivity of the beam splitter 3 and iteratively optimizing it within a range of 40% to 60% based on the changing trends of the target light intensity and the ghost light intensity, the ghost rate of the optical module is effectively reduced while maintaining sufficient intensity of the target light.

[0142] In another, more specific embodiment, refer to Figures 3-5 When the reflectivity of the beam splitter 3 is in the range of 50% to 60% and the reflectivity of the beam splitter 3 increases from A to B, the ghost light intensity corresponding to the reflectivity A of the beam splitter 3 is I1, and the ghost light intensity corresponding to the reflectivity B of the beam splitter 3 is I2. The rate of decrease of the ghost light intensity is c1 = (I1 - I2) / I2.

[0143] The target light intensity corresponding to the reflectivity A of the beam splitter 3 is I3, and the target light intensity corresponding to the reflectivity B of the beam splitter 3 is I4. The reduction rate of the target light intensity is c2 = (I3 - I4) / I4.

[0144] Wherein c1 is greater than c2.

[0145] In this embodiment, when the reflectivity of the beam splitter 3 increases from A to B, the ghost light intensity decreases significantly, and the decrease (c1) is relatively large. This indicates that increasing reflectivity can effectively reduce ghosting and improve the imaging quality of the optical module. Simultaneously, the target light intensity also decreases, but the decrease (c2) is relatively small. In other words, while increasing reflectivity to reduce ghosting, the loss of target light intensity is acceptable and will not significantly affect the overall performance of the optical module.

[0146] In practical applications, a balance point can be selected within the reflectivity range of 50% to 60% according to specific needs and scenarios, so that the intensity of ghost light is effectively reduced while the intensity of the target light remains within an acceptable range.

[0147] When adjusting reflectivity, other optical parameters should be kept constant to accurately assess the impact of reflectivity changes on ghosting rate and target light intensity. Multiple iterative measurements and optimizations should be performed during the adjustment process to ensure the optical module achieves optimal performance.

[0148] Therefore, in this embodiment, by adjusting the reflectivity of the beam splitter 3 and finding a balance point in the range of 50% to 60%, the ghosting rate of the optical module can be effectively reduced while maintaining sufficient intensity of the target light.

[0149] Furthermore, c1 is 10 to 15 times the value of c2.

[0150] In this embodiment, when the reflectivity of the beam splitter 3 increases from A to B within the range of 50% to 60%, the reduction rate c1 of the ghost light intensity is 10 to 15 times that of the reduction rate c2 of the target light intensity. That is, as the reflectivity increases, the reduction in ghost light intensity is much greater than the reduction in target light intensity. Therefore, when the reflectivity of the beam splitter 3 is within the range of 50% to 60%, appropriately increasing the reflectivity of the beam splitter 3 can more effectively reduce ghosting while having a relatively small impact on the target light intensity.

[0151] In practical applications, this ratio provides a clearer direction for optimization. This allows for a significant reduction in ghosting intensity by increasing reflectivity while maintaining a relatively stable target light intensity.

[0152] To find the optimal balance point, multiple iterative measurements can be performed within the reflectivity range of 50% to 60%, observing the changes in ghost light intensity and target light intensity, and calculating the corresponding reduction rates c1 and c2.

[0153] By comparing the values ​​of c1 and c2 under different reflectivities, we can find a reflectivity value that maximizes c1 (i.e., reduces ghost light intensity the most) while keeping c2 within an acceptable range.

[0154] For example, referring to Table 1 above: when the transmission / reflection ratio is T / R = 50% / 50%, the ghost light intensity is 0.25%, and the target light intensity is 12.5%.

[0155] Adjusting the transmission / reflection ratio to T / R = 40% / 60%, the ghost light intensity is 0.133%, a reduction of 49%; the target light intensity is 12%, a reduction of only 4%, resulting in a 46.7% reduction in ghost rate.

[0156] According to the analysis results, adjusting the transmittance-to-reflection ratio of the beam splitter 3 can reduce the ghost light intensity and ghost rate by nearly 50% while basically maintaining the target light intensity.

[0157] For example, when the target light intensity requirement is low, the reflectivity R adjustment range of the beam splitter 3 can be widened to 70% or even higher, at which point the ghost light intensity can be further reduced by nearly 80%.

[0158] <Optical Module for Reducing Ghosting>

[0159] This application also provides an optical module for reducing ghosting. (See attached document.) Figure 2 The optical module includes a screen 1, a first composite film 4, a beam splitter 3, and a second composite film 5.

[0160] The screen 1 is used to emit light. The light passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, passes through the beam splitter 3 again, is reflected by the first composite film 4, and finally passes through the beam splitter 3 and the second composite film 5 before being emitted as ghost light.

[0161] The transmittance-to-reflectance ratio of the beam splitter is within a preset range to reduce the ghosting rate of the optical module.

[0162] In this embodiment, reference is made to Figure 2 The optical module includes a screen 1, a first composite film 4, a beam splitter 3, and a second composite film 5. The first composite film 4 is positioned closer to the screen 1 than the beam splitter 3, and the beam splitter 3 is positioned closer to the screen 1 than the second composite film 5, that is, the beam splitter 3 is located between the first composite film 4 and the second composite film 5.

[0163] Specifically, such as Figure 2 As shown, screen 1 is used to emit light. The light passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, passes through the beam splitter 3 again, is reflected by the first composite film 4, and finally passes through the beam splitter 3 and the second composite film 5 before being emitted as ghost light.

[0164] This optical module reduces ghosting. A beam-splitting element 3 is positioned between the first composite film 4 and the second composite film 5. By using beam-splitting elements 3 with different transmittance-reflection ratios between the first composite film 4 and the second composite film 5, the optical module achieves different ghosting rates. In other words, by using beam-splitting elements 3 with different transmittance-reflection ratios between the first composite film 4 and the second composite film 5 according to actual imaging requirements, the ghosting rate of the optical module can be reduced.

[0165] In one embodiment, the preset range is between 2 / 3 and 3 / 2, the reflectivity of the beam splitter 3 is in the range of 40% to 60%, and the ghosting rate of the optical module decreases as the reflectivity of the beam splitter 3 increases, with the ghosting rate of the optical module ranging from 0.133% to 0.450%.

[0166] In this embodiment, the reflectivity of the beam-splitting element 3 in the optical module is set within the range of 40% to 60%. This range is selected based on the specific design requirements of the optical module and test feedback from practical applications.

[0167] For example, the reflectivity of the beam splitter 3 is less than 40%, resulting in a lower target light intensity and a higher ghost light intensity in the optical module. To ensure the target light intensity of the optical module, the reflectivity of the beam splitter 3 is set to ≥40%.

[0168] For example, the reflectivity of the beam splitter 3 is greater than 60%, and the intensity of the target light and the ghost light of the optical module are both low. Similarly, in order to ensure the intensity of the target light of the optical module, the reflectivity of the beam splitter 3 is set to ≤60%.

[0169] Within this range, as the reflectivity of the beam splitter 3 increases, the ghosting rate of the optical module decreases accordingly. This is because increasing reflectivity helps reduce multiple reflections of light within the module, thereby reducing ghosting.

[0170] Specifically, the reflectivity of beam-splitting element 3 is 40%, and the ghosting rate of the optical module is 0.450%. When the reflectivity of beam-splitting element 3 is 60%, the ghosting rate of the optical module is 0.133%. This means that as the reflectivity of beam-splitting element 3 increases, the ghosting rate of the optical module decreases accordingly. This also demonstrates that by placing beam-splitting elements 3 with different transmittance / reflectance ratios between the first composite film 4 and the second composite film 5, and finding the optimal reflectivity value of beam-splitting element 3 within the range of 40% to 60%, the ghosting rate of the optical module can be effectively reduced.

[0171] In one embodiment, refer to Figure 2 The screen 1 is used to emit light. The light passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, is reflected again by the beam splitter 3, is transmitted through the second composite film 5, and is emitted as the target light.

[0172] In this embodiment, the target light intensity refers to the light emitted from the screen 1, which passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, is reflected again by the beam splitter 3, is transmitted through the second composite film 5, and is then emitted as the target light.

[0173] It should be noted that, Figure 2 The optical architecture of the illustrated optical module is a basic architecture for realizing folded optical paths, which those skilled in the art can use to... Figure 2 Based on the existing architecture, additional film layers are added to achieve more complex folded optical paths. In different optical module architectures, the type and placement of the film layers will result in different target light paths. The above is merely a schematic diagram of a specific optical module architecture illustrating one possible ghosting ray path.

[0174] In one embodiment, the reflectivity of the beam splitter 3 is in the range of 40% to 50%. As the reflectivity of the beam splitter 3 increases, the intensity of the target light increases and the intensity of the ghost light decreases. The ghost rate of the optical module is in the range of 0.250% to 0.450%.

[0175] The reflectivity of the beam splitter 3 is in the range of 50% to 60%. As the reflectivity of the beam splitter 3 increases, the intensity of the target light and the intensity of the ghost light both decrease. The ghost rate of the optical module is in the range of 0.133% to 0.250%.

[0176] In this embodiment, the reflectivity of the beam splitter 3, the intensity of the target light, and the intensity of the ghost light exhibit the aforementioned variation pattern.

[0177] Based on the above-mentioned variation pattern, if the ghosting rate is greater than the preset threshold and the current reflectivity is less than 50%, then increasing the reflectivity is considered to reduce the ghosting light intensity and increase the target light intensity. That is, a beam splitter 3 with a relatively high reflectivity of less than or equal to 50% is placed between the first composite film 4 and the second composite film 5. If the ghosting rate is still greater than the preset threshold, but the current reflectivity is close to or exceeds 50%, then a balance needs to be struck between the changes in target light intensity and ghosting light intensity. Based on the requirement for target light intensity, a beam splitter 3 with a reflectivity greater than 50% can be placed between the first composite film 4 and the second composite film 5.

[0178] Therefore, in this embodiment, in the optical module, according to the requirements of target light intensity and ghost light intensity, setting a beam splitter 3 with different reflectivity between the first composite film 4 and the second composite film 5 can effectively reduce the ghost rate of the optical module while maintaining sufficient intensity of the target light.

[0179] In one specific embodiment, the first composite film 4 includes, along the optical axis from the human eye side to the screen 1 side, a first antireflection film 2, a first phase retardation film, and a first linear polarizer; the second composite film 5 includes, along the optical axis from the human eye side to the screen 1 side, a second antireflection film, a second linear polarizer, a reflective polarizing element, and a second phase retardation film.

[0180] In this embodiment, a first composite film 4 is provided in the optical module, and the specific position of the first composite film 4 can vary depending on the design of the optical module.

[0181] The main function of the first composite film 4 is to convert the light emitted from the screen 1 into circularly polarized light. Circularly polarized light can better resist reflection and scattering, thereby improving the clarity and contrast of the image.

[0182] The first composite film 4 works in conjunction with other optical elements such as the beam splitter 3 to optimize the overall performance of the optical module. For example, the beam splitter 3 can adjust its reflectivity and transmittance as needed, while the first composite film 4 ensures that the emitted light has the required polarization state.

[0183] In a more specific embodiment, refer to Figure 2 The first composite film 4 includes, from the human eye side to the screen 1 side, a first antireflective film 2, a first phase delay film, and a first linear polarizer.

[0184] Specifically, when the light emitted from screen 1 passes through the first linear polarizer and the first phase retardation film in sequence, they work together to convert the linearly polarized light into circularly polarized light. After passing through the first linear polarizer and the first phase retardation film in sequence, the light further passes through the first antireflection film 2, thereby reducing light reflection loss and improving image quality.

[0185] For example, the first phase delay plate can be a quarter-wave plate.

[0186] The second composite film 5 is positioned away from the screen 1 relative to the beam splitter 3, and the second composite film 5 is used to form a folded optical path.

[0187] In this embodiment, by introducing the second composite film 5 and designing an optical module that generates a folded optical path, the overall size of the optical module can be reduced, the propagation path of light in the optical module can be optimized, and specific imaging or display requirements can be met.

[0188] In a more specific embodiment, the second composite film 5 includes, along the optical axis from the human eye side to the screen 1 side, a second antireflection film, a second linear polarizer, a reflective polarizing element, and a second phase retardation film in sequence.

[0189] For example, the second phase delay plate can be a quarter-wave plate.

[0190] In one specific embodiment, the optical system further includes at least one lens located on either side of the first composite film 4, the beam splitter 3, and the second composite film 5.

[0191] In one specific embodiment, refer to Figure 2The optical module includes a screen 1, a first lens 6, and a second lens 7, with the second lens 7 being further away from the screen 1 than the first lens 6. A first composite film 4 is disposed on the side of the first lens 6 facing away from the screen 1. The first composite film 4 includes, in sequence from the human eye side to the screen 1 side, a first anti-reflection film 2, a first phase retardation film, and a first linear polarizer.

[0192] A beam-splitting element 3 is disposed on the surface of the second lens 7 near the first lens 6. A second composite film 5 is disposed on the surface of the second lens 7 opposite to the first lens 6, and the second composite film 5 is used to generate a folded optical path. The second composite film 5 includes, in sequence along the optical axis from the human eye side to the screen 1 side, a second anti-reflection film, a second linear polarizer, a reflective polarizing element, and a second phase retardation film.

[0193] In this optical module: the path of the target light beam is: screen 1 - first lens 6 - first composite film 4 - beam splitter 3 - second lens 7 - second composite film 5 - second lens 7 - beam splitter 3 - second lens 7 - second composite film 5 - human eye.

[0194] Ghost ray path: Screen 1 - First lens 6 - First composite film 4 - Beam splitter 3 - Second lens 7 - Second composite film 5 - Second lens 7 - Beam splitter 3 - First anti-reflective film 2 - Beam splitter 3 - Second lens 7 - Second composite film 5 - Human eye.

[0195] Compared to the path of the target ray, the ghost ray path passes through the beam splitter 3 one more time. By adjusting the transmittance-to-reflection ratio of the beam splitter 3, the ghosting of the optical module can be reduced.

[0196] <System Implementation Example>

[0197] This application also provides a system for reducing optical module ghosting. The device system for reducing optical module ghosting includes:

[0198] An optical module, comprising a screen 1, a first composite film 4, a beam splitter 3, and a second composite film 5. This optical module is the aforementioned optical module designed to reduce ghosting.

[0199] The screen 1 is used to emit light. The light passes through the first composite film 4 and the beam splitter 3, is reflected by the second composite film 5, passes through the beam splitter 3 again, is reflected by the first composite film 4, and finally passes through the beam splitter 3 and the second composite film 5 before being emitted as ghost light.

[0200] An acquisition module is used to acquire the ghost light intensity and the target light intensity of the optical module.

[0201] A calculation module is used to determine the ghosting rate of the optical module based on the ghosting light intensity and the target light intensity;

[0202] The comparison module is used to determine whether the ghosting rate is ≤ a preset threshold.

[0203] If the ghosting rate is greater than a preset threshold, the adjustment module is used to adjust the transmission-reflection ratio of the beam splitter 3 until the ghosting rate is less than or equal to the preset threshold.

[0204] Therefore, in this embodiment, by acquiring the ghost light intensity and the target light intensity through the acquisition module, calculating the ghost rate through the calculation module, and adjusting the transmission and reflection ratio of the beam splitter 3 according to the calculation results, the ghost in the optical module can be significantly reduced and the imaging quality improved.

[0205] <Media Example>

[0206] In this embodiment, a computer-readable storage medium is also provided, which stores a computer program that can be read and executed by a computer. The computer program is used to perform a method for reducing optical module ghosting as described in any of the above method embodiments of the present invention when read and executed by the computer.

[0207] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on its differences from other embodiments. However, those skilled in the art should understand that the above embodiments can be used individually or in combination as needed. Furthermore, for the apparatus embodiments, since they correspond to the method embodiments, the description is relatively simple; relevant parts can be referred to the corresponding parts of the method embodiments. The system embodiments described above are merely illustrative, and the modules described as separate components may or may not be physically separate.

[0208] This invention can be a system, method, and / or computer program product. A computer program product may include a computer-readable storage medium having computer-readable program instructions loaded thereon for causing a processor to implement various aspects of the invention.

[0209] Computer-readable storage media can be tangible devices capable of holding and storing instructions for use by an instruction execution device. Computer-readable storage media can be, for example—but not limited to—electrical storage devices, magnetic storage devices, optical storage devices, electromagnetic storage devices, semiconductor storage devices, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), static random access memory (SRAM), portable compact disc read-only memory (CD-ROM), digital multifunction disc (DVD), memory sticks, floppy disks, mechanical encoding devices, such as punch cards or recessed protrusions storing instructions thereon, and any suitable combination thereof. The computer-readable storage media used herein are not to be construed as transient signals themselves, such as radio waves or other freely propagating electromagnetic waves, electromagnetic waves propagating through waveguides or other transmission media (e.g., light pulses through fiber optic cables), or electrical signals transmitted through wires.

[0210] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0211] The computer program instructions used to perform the operations of this invention may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, state setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing state information from the computer-readable program instructions. This electronic circuitry can execute the computer-readable program instructions to implement various aspects of the invention.

[0212] Various aspects of the present invention are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0213] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0214] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0215] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions. It will be known to those skilled in the art that implementation in hardware, implementation in software, and implementation using a combination of software and hardware are equivalent.

[0216] The various embodiments of the present invention have been described above. These descriptions are exemplary and not exhaustive, and are not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles, practical application, or technical improvements to the embodiments in the market, or to enable others skilled in the art to understand the embodiments disclosed herein. The scope of the invention is defined by the appended claims.

Claims

1. A method for reducing ghosting in an optical module, characterized in that, The optical module includes a screen, a first composite film, a beam splitter, and a second composite film. The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light. The first composite film includes a first anti-reflection film. The specific steps for obtaining the ghost light intensity of the optical module include: The ghost light intensity is determined based on the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter, and the reflectance of the first antireflection film. The method includes: The ghost light intensity and target light intensity of the optical module are obtained; Wherein, the ghost ray intensity = I*t*a*T 3 ; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectance of the first antireflection film, and T is the transmittance of the beam splitter. The target light intensity = I*t*T*R; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, T is the transmittance of the beam splitter, and R is the reflectance of the beam splitter. The ghost rate of the optical module is determined based on the ghost light intensity and the target light intensity. Determine whether the ghosting rate is ≤ a preset threshold; If the ghosting rate is greater than a preset threshold, adjust the transmittance / reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold.

2. The method for reducing optical module ghosting according to claim 1, characterized in that, Obtaining the target light intensity of the optical module specifically includes: The target light intensity is determined based on the light transmittance of the first composite film, the intensity of the light emitted from the screen, and the transmittance and reflectance of the beam splitter.

3. The method for reducing optical module ghosting according to claim 1, characterized in that, If the ghosting rate is greater than a preset threshold, adjust the transmission-reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold, specifically including: The reflectivity of the beam splitter is in the range of 40% to 60%. As the reflectivity of the beam splitter increases, the ghosting rate of the optical module decreases.

4. The method for reducing optical module ghosting according to claim 3, characterized in that, The reflectivity of the beam splitter is in the range of 40% to 60%, and the ghosting rate of the optical module is in the range of 0.133% to 0.450%.

5. The method for reducing optical module ghosting according to claim 1, characterized in that, If the ghosting rate is greater than a preset threshold, adjust the transmission-reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold, specifically including: The reflectivity of the beam splitter increases within the range of 40% to 50%. As the reflectivity of the beam splitter increases, the intensity of the target light increases and the intensity of the ghost light decreases. The reflectivity of the beam splitter increases within the range of 50% to 60%. As the reflectivity of the beam splitter increases, the intensity of the target light and the intensity of the ghost light both decrease.

6. The method for reducing optical module ghosting according to claim 5, characterized in that, When the reflectivity of the beam splitter is in the range of 50% to 60% and the reflectivity of the beam splitter increases from A to B, the ghost light intensity corresponding to the reflectivity A of the beam splitter is I1, the ghost light intensity corresponding to the reflectivity B of the beam splitter is I2, and the reduction rate of the ghost light intensity is c1 = (I1 - I2) / I2. The target light intensity corresponding to the reflectivity A of the beam splitter is I3, and the target light intensity corresponding to the reflectivity B of the beam splitter is I4. The reduction rate of the target light intensity is c2 = (I3 - I4) / I4. Wherein c1 is greater than c2.

7. The method for reducing optical module ghosting according to claim 6, characterized in that, The c1 is 10 to 15 times the c2.

8. An optical module for reducing ghosting, characterized in that, The optical module includes a screen, a first composite film, a beam splitter, and a second composite film. The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light. The first composite film includes a first anti-reflection film. The specific steps for obtaining the ghost light intensity of the optical module include: The ghost light intensity is determined based on the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter, and the reflectance of the first antireflection film. The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, is reflected again by the beam splitter, is transmitted through the second composite film, and is emitted as the target light. The ghosting rate of the optical module is determined based on the ghosting ray intensity and the target ray intensity, wherein the ghosting ray intensity = I*t*a*T 3 ; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectance of the first antireflection film, and T is the transmittance of the beam splitter. The target light intensity = I*t*T*R; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, T is the transmittance of the beam splitter, and R is the reflectance of the beam splitter. The transmittance-to-reflectance ratio of the beam splitter is within a preset range to reduce the ghosting rate of the optical module.

9. The optical module for reducing ghosting according to claim 8, characterized in that, The preset range is between 2 / 3 and 3 / 2, the reflectivity of the beam splitter is between 40% and 60%, the ghosting rate of the optical module decreases as the reflectivity of the beam splitter increases, and the ghosting rate of the optical module ranges from 0.133% to 0.450%.

10. The optical module for reducing ghosting according to claim 8, characterized in that, The reflectivity of the beam splitter is in the range of 40% to 50%. As the reflectivity of the beam splitter increases, the intensity of the target light increases and the intensity of the ghost light decreases. The ghost rate of the optical module ranges from 0.250% to 0.450%. The reflectivity of the beam splitter is in the range of 50% to 60%. As the reflectivity of the beam splitter increases, the intensity of the target light and the intensity of the ghost light both decrease. The ghost rate of the optical module is in the range of 0.133% to 0.250%.

11. The optical module for reducing ghosting according to claim 8, characterized in that, The first composite film includes, along the optical axis from the human eye side to the screen side, a first antireflective film, a first phase retardation film, and a first linear polarizer in sequence; the second composite film includes, along the optical axis from the human eye side to the screen side, a second antireflective film, a second linear polarizer, a reflective polarizing element, and a second phase retardation film in sequence.

12. The optical module for reducing ghosting according to claim 11, characterized in that, The optical module also includes at least one lens, which is located on either side of the first composite film, the beam splitter, and the second composite film.

13. A system for reducing ghosting in an optical module, characterized in that, include: An optical module, comprising a screen, a first composite film, a beam splitter, and a second composite film; The screen is used to emit light. The light passes through the first composite film and the beam splitter, is reflected by the second composite film, passes through the beam splitter again, is reflected by the first composite film, and finally passes through the beam splitter and the second composite film before being emitted as ghost light. The first composite film includes a first antireflective film, and obtaining the ghost light intensity of the optical module specifically includes: The ghost light intensity is determined based on the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter, and the reflectance of the first antireflection film. An acquisition module is used to acquire the ghost light intensity and the target light intensity of the optical module. Wherein, the ghost ray intensity = I*t*a*T 3 ; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectance of the first antireflection film, and T is the transmittance of the beam splitter. The target light intensity = I*t*T*R; Where I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, T is the transmittance of the beam splitter, and R is the reflectance of the beam splitter. A calculation module is used to determine the ghosting rate of the optical module based on the ghosting light intensity and the target light intensity; The comparison module is used to determine whether the ghosting rate is ≤ a preset threshold. If the ghosting rate is greater than a preset threshold, the adjustment module is used to adjust the transmission-reflection ratio of the beam splitter until the ghosting rate is less than or equal to the preset threshold.

14. A computer-readable storage medium, characterized in that, It stores computer instructions, which, when executed by a processor, perform the method for reducing optical module ghosting as described in any one of claims 1-7.

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