Method and system for reducing ghosting of optical module and optical module for reducing ghosting

Abstract

The embodiment of the invention provides a method and system for reducing ghosts of an optical module and the optical module for reducing the ghosts. The optical module comprises a screen, a first composite film, a light splitting element and a second composite film, the screen is used for emitting light, the light is reflected by the second composite film after penetrating through the first composite film and the light splitting element, the light is reflected by the first composite film after penetrating through the light splitting element again, and finally the light emitted after penetrating through the light splitting element and the second composite film is ghosting light; the method comprises the following steps: acquiring ghosting light intensity and target light intensity of the optical module; determining the ghosting rate of the optical module according to the ghosting light intensity and the target light intensity; judging whether the ghosting rate is less than or equal to a preset threshold value; and if the ghosting rate is greater than a preset threshold value, adjusting the transflective ratio of the light splitting element until the ghosting rate is less than or equal to the preset threshold value.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of optical display technology. More specifically, the embodiments of the present application relate to a method for reducing ghost images of an optical module, a system for reducing ghost images of an optical module, and an optical module for reducing ghost images. Background Art

[0002] Optical modules provide users with simulations of vision, hearing, touch and other senses, making users feel as if they are in the scene. They are widely used in medicine, entertainment, military aerospace, interior design, real estate development, rehabilitation training and other fields. The quality of optical module imaging is an important factor affecting product quality. If there is a serious ghosting phenomenon when using an optical module, it will seriously affect the user's sense of immersion.

[0003] At present, in order to effectively reduce the intensity of ghost images, the common practice is to control the reflectivity of the anti-reflection (AR) film to an extremely low level, or to use ultra-low reflection film materials for attachment. However, both methods will inevitably lead to a significant increase in material costs and a significant increase in the difficulty of the production process.

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

[0005] The first purpose of the present application is to provide a new technical solution for reducing ghost images of optical modules.

[0006] The second purpose of this application is to provide a new technical solution for optical modules to reduce ghosting.

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

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

[0009] In a first aspect, an embodiment of the present application provides a method for reducing ghost images of an optical module. The optical module includes a screen, a first composite film, a beam splitter element, and a second composite film;

[0010] The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light;

[0011] The method comprises:

[0012] Obtaining ghost light intensity and target light intensity of the optical module;

[0013] Determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity;

[0014] Determine whether the ghost rate is less than or equal to a preset threshold;

[0015] If the ghost rate is greater than a preset threshold, the transmittance-reflection ratio of the light splitting element is adjusted until the ghost rate is less than or equal to the preset threshold.

[0016] Optionally, the first composite film includes a first anti-reflection film, the screen is provided with the first composite film, and obtaining the ghost light intensity of the optical module specifically includes:

[0017] The ghost light intensity is determined according to the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter element and the reflectance of the first anti-reflection film.

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

[0019] Wherein I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectivity of the first anti-reflection film, and T is the transmittance of the spectroscopic element.

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

[0021] The target light intensity is determined according to the light transmittance of the first composite film, the light intensity emitted from the screen, and the transmittance and reflectance of the spectroscopic element.

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

[0023] Wherein 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 spectroscopic element, and R is the reflectivity of the spectroscopic element.

[0024] Optionally, if the ghost rate is greater than a preset threshold, adjusting the transmission-reflection ratio of the light splitting element until the ghost rate is less than or equal to the preset threshold, specifically includes:

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

[0026] Optionally, the reflectivity of the light splitting element is in the range of 40% to 60%, and the ghost rate of the optical module is in the range of 0.133% to 0.450%.

[0027] Optionally, if the ghost rate is greater than a preset threshold, adjusting the transmission-reflection ratio of the light splitting element until the ghost rate is less than or equal to the preset threshold, specifically includes:

[0028] The reflectivity of the light splitting element increases within a range of 40% to 50%, and as the reflectivity of the light splitting element increases, the intensity of the target light increases and the intensity of the ghost light decreases;

[0029] The reflectivity of the light splitting element increases within a range of 50% to 60%. As the reflectivity of the light splitting element 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 within 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 light splitting element is I3, the target light intensity corresponding to the reflectivity B of the light splitting element is I4, and the reduction rate of the target light intensity is c2=(I3-I4) / I4;

[0032] Wherein said c1 is greater than said c2.

[0033] Optionally, c1 is 10 to 15 times greater than c2.

[0034] In a second aspect, the embodiment of the present application further provides an optical module for reducing ghosting. The optical module includes a screen, a first composite film, a beam splitter element, and a second composite film;

[0035] The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light;

[0036] The transmission and reflection ratio of the light splitting element is within a preset range to reduce the ghost rate of the optical module.

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

[0038] Optionally, the screen is used to emit light, and the light transmits the first composite film and the spectroscopic element, is reflected by the second composite film, is reflected by the spectroscopic element again, and then is transmitted through the second composite film to emit the target light.

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

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

[0041] Optionally, the first composite film includes a first anti-reflection film, a first phase retarder and a first linear polarizer in sequence along the optical axis from the human eye side to the screen side; the second composite film includes a second anti-reflection film, a second linear polarizer, a reflective polarization element and a second phase retarder in sequence along the optical axis from the human eye side to the screen side.

[0042] Optionally, the optical system further comprises at least one lens, and the lens is located on any one side of the first composite film, the beam splitting element and the second composite film.

[0043] In a third aspect, an embodiment of the present application further provides a system for reducing ghost images of an optical module. The system for reducing ghost images of an optical module includes:

[0044] An optical module, comprising a screen, a first composite film, a light splitting element and a second composite film;

[0045] The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light;

[0046] An acquisition module, used for acquiring the ghost light intensity and target light intensity of the optical module;

[0047] A calculation module, used for determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity;

[0048] A comparison module, used to determine whether the ghost rate is less than or equal to a preset threshold;

[0049] The adjustment module is used to adjust the transmission and reflection ratio of the light splitting element if the ghost rate is greater than a preset threshold value until the ghost rate is less than or equal to the preset threshold value.

[0050] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium having computer instructions stored thereon, wherein the computer instructions, when executed by a processor, execute the method for reducing optical module ghosting described in the first aspect.

[0051] According to the embodiments of the present application, by obtaining the ghost light intensity and the target light intensity, calculating the ghost rate, and adjusting the transmission-reflection ratio of the beam splitter according to the calculation result, the ghost in the optical module can be significantly reduced and the imaging quality can be improved. In addition, by adjusting the transmission-reflection ratio of the beam splitter to reduce the ghost of the optical module, the cost and operation difficulty can be reduced.

[0052] Other features and advantages of the present specification will become apparent from the following detailed description of exemplary embodiments of the present specification with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the specification and, together with the description, serve to explain the principles of the specification.

[0054] Figure 1 Shown is a flow chart of a method for reducing optical module ghosting provided in an embodiment of the present application.

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

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

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

[0058] Figure 5 The graph shows the relationship between the ghost rate and the reflectivity of the beam splitter.

[0059] Description of reference numerals:

[0060] 1. Screen; 2. First anti-reflection film; 3. Beam splitter; 4. First composite film; 5. Second composite film; 6. First lens; 7. Second lens. DETAILED DESCRIPTION

[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 of components and steps, numerical expressions and numerical values ​​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 in nature and is in no way intended to limit the present application, its application, or uses.

[0063] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0064] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0065] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0066] The embodiments of the present application provide a method for reducing ghost images in an optical module. Ghost images are usually caused by multiple reflections or scattering of light inside the optical module. These reflections and scatterings may come from various interfaces inside the optical module, such as the lens surface, filter, and spectroscopic element. Ghost images not only affect the image quality, but may also cause confusion and misjudgment of image information.

[0067] The method provided in the embodiment of the present application is specifically used to reduce the ghost image formed by the optical module using the beam splitter element 3. The method can reduce the ghost image of the optical module and improve the imaging quality by adjusting the transmission-reflection ratio of the beam splitter element 3. Exemplarily, the optical module is an optical module that generates a folded light path.

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

[0069] Specifically, Figure 2 As shown, the screen 1 is used to emit light. The light is transmitted through the first composite film 4 and the spectroscopic element 3, then reflected by the second composite film 5, and then transmitted through the spectroscopic element 3 again, then reflected by the first composite film 4. Finally, the light emitted after being transmitted through the spectroscopic element 3 and the second composite film 5 is a ghost light.

[0070] It should be noted that Figure 2 The optical architecture of the optical module shown is a basic architecture for realizing a folded optical path. Those skilled in the art can Figure 2 On the basis of the architecture, a film layer is added to realize a more complex folded optical path. In different architectures of optical modules, the ghost light paths will be different due to the different types of film layers in the optical modules and the different locations of the film layers in the optical modules. The above is just a schematic diagram of a ghost light path based on a specific architecture of the optical module.

[0071] In addition, although the ghost light path may be different due to different optical structures of the optical module, the method for reducing the ghost of the optical module provided by the embodiment of the present application is applicable to the optical structures of different optical modules.

[0072] Hereinafter, various embodiments and examples according to the present application are described with reference to the accompanying drawings.

[0073] <Method Example>

[0074] Reference Figure 1 , the method for reducing the ghosting of the optical module includes the following steps:

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

[0076] S2: determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity;

[0077] S3: Determine whether the ghost rate is less than or equal to a preset threshold;

[0078] S4: If the ghost rate is greater than a preset threshold, adjust the transmission-reflection ratio of the light splitting element 3 until the ghost 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 and the second composite film 5. 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 the screen 1. The light is transmitted through the first composite film 4 and the beam splitter 3, then reflected through the second composite film 5, and then reflected again by the beam splitter 3 and transmitted through the second composite film 5. The target light is the light emitted.

[0081] In one example, the intensity of the ghost light can be measured and obtained by an optical measuring device, for example, the optical measuring device can be an optical power meter.

[0082] In a specific embodiment, the first composite film 4 includes a first anti-reflection film 2, the screen 1 is provided with the first composite film 4, and obtaining the ghost light intensity of the optical module specifically includes:

[0083] The intensity of the ghost light is determined according to 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 anti-reflection film 2 .

[0084] In this embodiment, by considering 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 anti-reflection film 2, the intensity of the ghost light in the optical module can be accurately calculated.

[0085] Specifically, the first composite film 4 generally includes a multilayer film for enhancing the light transmission performance, anti-reflection performance or providing other optical properties of the screen 1. The transmittance of the first composite film 4 refers to the ratio of the intensity of light passing through the first composite film 4 to the incident light when the light passes through the screen 1.

[0086] The intensity of light emitted from the screen 1 refers to the intensity of light emitted directly from the surface of the screen 1 . This can usually be directly measured by an optical measuring device (such as a photometer). Alternatively, the intensity of light emitted from the screen 1 can be determined based on the type of the 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 the 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 main function of the first anti-reflection film 2 is to reduce the reflection of light of a specific wavelength and increase the transmittance. However, under certain conditions (such as a specific incident angle or wavelength), the first anti-reflection film 2 may also have a certain reflectivity. The reflectivity of the first anti-reflection film 2 refers to the ratio of the light reflected back from the surface of the first anti-reflection film 2 to the intensity of the incident light.

[0089] Based on the above parameters, the ghost light intensity can be calculated by the following formula:

[0090] Ghost light intensity = screen 1 outgoing light intensity × first composite film 4 transmittance × light splitting element 3 transmittance n × reflectivity of the first anti-reflection film 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 the ghost light intensity needs to be implemented in combination with the architecture of the specific optical module. When the architecture of the optical module is different, the calculation formula for the ghost light intensity will be different.

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

[0093] Wherein I is the intensity of light emitted from the screen 1 , t is the transmittance of the first composite film 4 , a is the reflectivity of the first anti-reflection film 2 , and T is the transmittance of the light splitting element 3 .

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

[0095] In one example, the intensity of the target light can be measured and obtained by an optical measuring device, for example, the optical measuring device can be an optical power meter.

[0096] In a 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 according to the light transmittance of the first composite film 4 , the light intensity emitted from the screen 1 , and the transmittance and reflectance of the light splitting element 3 .

[0098] In this embodiment, the first composite film 4 is a multilayer film through which light passes when it is emitted from the inside of the screen 1 to the outside, and the light transmittance of these films will directly affect the intensity of the light emitted from the screen 1. If the light transmittance of the composite film is high, more light can pass through this film, otherwise less light.

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

[0100] The spectrometer 3 in the optical module plays the role of separating the light, part of the light will be transmitted, and the other part will be reflected. The transmittance and reflectance represent the proportion of light transmitted and reflected respectively. These two parameters are crucial to determine the target light intensity.

[0101] In order to obtain the target light intensity, according to the architecture of the optical module and the above parameters, the target light intensity can be calculated by the following formula:

[0102] Target light intensity=intensity of light emitted from the screen 1×transmittance of the first composite film 4×transmittance of the spectroscopic element 3×reflectivity of the spectroscopic element 3 .

[0103] It should be noted that the calculation of the target light intensity needs to be implemented in combination with the architecture of the specific optical module. When the architecture of the optical module is different, the calculation formula of the target light intensity will be different.

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

[0105] Wherein I is the intensity of light emitted from the screen 1 , t is the transmittance of the first composite film 4 , T is the transmittance of the light splitting element 3 , and R is the reflectivity of the light splitting element 3 .

[0106] It should be noted that, without considering other factors such as light reflected 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 ghost rate is defined as the ratio of the ghost light intensity to the target light intensity. This ratio reflects the intensity of the ghost light relative to the target light and is an important indicator for evaluating the ghost degree of the optical module.

[0108] In step S1, after the ghost light intensity and the target light intensity are obtained, the ghost rate can be calculated by the ghost light intensity and the target light intensity.

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

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

[0111] In step S4, according to the above specific embodiment, the ghost light intensity = the light intensity emitted from the screen 1 × the transmittance of the first composite film 4 × the transmittance of the light splitting element 3 n × reflectivity of the first anti-reflection film 2. It can be seen that the intensity of the ghost light can be affected by changing the transmission and reflection ratio of the beam splitter 3. The specific adjustment method of the transmission and reflection ratio can include changing the material, thickness, coating, etc. of the beam splitter 3.

[0112] It should be noted that, in this embodiment, the spectrometer element 3 can be detachably arranged in the optical module. If the ghost rate is greater than a preset threshold and the transmission and reflection ratio of the spectrometer element 3 needs to be adjusted, the embodiment of the present application can adjust the transmission and reflection ratio of the spectrometer element 3 by replacing different types of spectrometer elements 3.

[0113] In addition, different types (models) of beam splitters 3 have different transmittance-reflection ratios. After the beam splitter 3 is manufactured, the beam splitter 3 has a certain transmittance-reflection ratio. Therefore, the embodiment of the present application can adjust the transmittance-reflection ratio of the beam splitter 3 by replacing different types of beam splitters 3.

[0114] Since the reduction of the ghost rate is usually an iterative process, it is necessary to repeatedly measure or calculate the ghost light intensity and the target light intensity, recalculate the ghost rate, and adjust the transmission and reflection ratio of the beam splitter 3 according to the calculation result. This process may require multiple iterations until the ghost rate meets the requirements of the preset threshold.

[0115] Therefore, in this embodiment, by obtaining the ghost light intensity and the target light intensity, calculating the ghost rate, and adjusting the transmission and reflection ratio of the spectrometer 3 according to the calculation result, the ghost in the optical module can be significantly reduced and the imaging quality can be improved. In addition, by adjusting the transmission and reflection ratio of the spectrometer 3 to reduce the ghost of the optical module, the cost and operation difficulty can be reduced. Exemplarily, by preparing spectrometers 3 with different transmission and reflection ratios (it is easier to prepare spectrometers 3 with different transmission and reflection ratios), the spectrometers 3 with different transmission and reflection ratios are applied to the optical module to reduce the ghost of the optical module, which can reduce the cost and operation difficulty.

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

[0117] A beam splitter 3 is disposed on the surface of the second lens 7 close to the first lens 6. A second composite film 5 is disposed on the surface of the second lens 7 away from the first lens 6, and the second composite film 5 is used to generate a folded optical path.

[0118] In this specific optical module, ghost light intensity = I*t*a*T 3, where I is the intensity of light emitted from the screen 1, t is the transmittance of the first composite film 4, a is the reflectivity of the first anti-reflection 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 light emitted from the 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 reflectivity of the beam splitter 3.

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

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

[0121] Table 1:

[0122]

[0123] According to the above analysis, the ghost image of the optical module can be reduced by adjusting the transmittance-reflection ratio of the light splitting element 3 .

[0124] In a specific embodiment, referring to Figure 5 If the ghost rate is greater than a preset threshold, adjusting the transmission-reflection ratio of the light splitting element 3 until the ghost rate is less than or equal to the preset threshold, specifically including:

[0125] The reflectivity of the light splitting element 3 is in the range of 40% to 60%. As the reflectivity of the light splitting element 3 increases, the ghost rate of the optical module decreases.

[0126] In this embodiment, the reflectivity of the light splitting element 3 is set to be adjusted within a range of 40% to 60%. The selection of this range is based on the specific design requirements of the optical module and test feedback in actual applications.

[0127] Exemplarily, the reflectivity of the beam splitter 3 is less than 40%, the target light intensity of the optical module is small, and the ghost light intensity of the optical module is large. In order to ensure the target light intensity of the optical module, the reflectivity of the beam splitter 3 is set to ≥40%.

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

[0129] Within this range, as the reflectivity of the light splitting element 3 increases, the ghost rate of the optical module will decrease accordingly, because increasing the reflectivity helps reduce multiple reflections of light inside the module, thereby reducing the generation of ghosts.

[0130] In the range of 40% to 60%, the reflectivity of the light splitting element 3 is gradually increased with a certain step size (such as 1%, 2%, etc.). After each adjustment of the reflectivity, the ghost rate and the target light intensity of the optical module need to be remeasured. By analyzing the ghost rate data obtained from each measurement, it is observed whether it shows a downward trend with the increase of the reflectivity.

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

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

[0133] Specifically, the reflectivity of the light splitting element 3 is in the range of 40% to 60%, and the ghost rate of the optical module is in the range of 0.133% to 0.450%.

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

[0135] In a more specific embodiment, referring to Figure 3 and Figure 4 If the ghost rate is greater than a preset threshold, adjusting the transmission-reflection ratio of the light splitting element 3 until the ghost rate is less than or equal to the preset threshold, specifically including:

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

[0137] The reflectivity of the light splitting element 3 increases within a range of 50% to 60%. As the reflectivity of the light splitting element 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 light-splitting element 3 is adjusted within a range of 40% to 60%.

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

[0140] According to the above-mentioned change rule, if the ghost rate is greater than the preset threshold value and the current reflectivity is lower than 50%, consider increasing the reflectivity to reduce the ghost light intensity and increase the target light intensity. If the ghost rate is still greater than the preset threshold value, but the current reflectivity is close to or exceeds 50%, it is necessary to weigh the changes in the target light intensity and the ghost light intensity, and adjust the reflectivity of the beam splitter 3 according to the demand for the target light intensity.

[0141] Therefore, in this embodiment, by adjusting the reflectivity of the spectroscopic element 3 and performing iterative optimization within the range of 40% to 60% according to 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, referring to Figure 3-Figure 5 , when the reflectivity of the light splitting element 3 is within the range of 50% to 60% and the reflectivity of the light splitting element 3 increases from A to B, the ghost light intensity corresponding to the reflectivity A of the light splitting element 3 is I1, and the ghost light intensity corresponding to the reflectivity B of the light splitting element 3 is I2, and the reduction rate of the ghost light intensity is c1=(I1-I2) / I2;

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

[0144] Wherein said c1 is greater than said c2.

[0145] In this embodiment, when the reflectivity of the light-splitting element 3 increases from A to B, the intensity of the ghost light is significantly reduced, and the reduction (c1) is relatively large. This shows that increasing the reflectivity can effectively reduce the generation of ghosts and improve the imaging quality of the optical module. At the same time, the intensity of the target light will also decrease, but the reduction (c2) is relatively small. In other words, while increasing the reflectivity to reduce ghosts, the loss of the 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% based on specific needs and scenarios, so that the intensity of ghost light is effectively reduced while the intensity of target light remains within an acceptable range.

[0147] When adjusting the reflectivity, other optical parameters should be kept constant in order to accurately evaluate the impact of reflectivity changes on ghost rate and target light intensity. Multiple iterations of measurement and optimization should be performed during the adjustment process to ensure that the optical module achieves optimal performance.

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

[0149] Furthermore, the c1 is 10 to 15 times greater than the 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 the reduction rate c2 of the target light intensity. That is, in the process of increasing the reflectivity, the reduction range of the ghost light intensity is much greater than the reduction range of the target light intensity. Therefore, when the reflectivity of the beam splitter 3 is within the range of 50% to 60%, by appropriately increasing the reflectivity of the beam splitter 3, the ghost can be more effectively reduced, while the impact on the target light intensity is relatively small.

[0151] In practical applications, this proportional relationship provides a clearer optimization direction, which can significantly reduce the intensity of ghost light by increasing the reflectivity while keeping the target light intensity relatively stable.

[0152] In order to find the best balance point, multiple iterative measurements can be performed within the reflectivity range of 50% to 60%, the changes in the ghost light intensity and the target light intensity can be observed, and the corresponding reduction rates c1 and c2 can be calculated.

[0153] By comparing the c1 and c2 values ​​under different reflectivity, a reflectivity value can be found that makes c1 as large as possible (that is, the intensity of ghost light is reduced the most) and c2 remains within an acceptable range.

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

[0155] Adjust the transmittance / reflection ratio to T / R = 40% / 60%. At this time, the ghost light intensity is 0.133%, a decrease of 49%; the target light intensity is 12%, a decrease of only 4%, and the ghost rate is reduced by 46.7%.

[0156] According to the analysis results: by adjusting the transmittance-reflection ratio of the light splitting element 3, the ghost light intensity and the ghost rate can be reduced by nearly 50% while basically maintaining the target light intensity.

[0157] For example, when the target light intensity requirement is relatively low, the reflectivity R adjustment range of the light splitting element 3 can be relaxed to 70% or even higher, and the ghost light intensity can be further reduced by nearly 80%.

[0158] <Optical module to reduce ghosting>

[0159] The present application also provides an optical module for reducing ghosting. Figure 2 , the optical module includes a screen 1, a first composite film 4, a light splitting element 3 and a second composite film 5;

[0160] The screen 1 is used to emit light, and the light is transmitted through the first composite film 4 and the beam splitter element 3, then reflected by the second composite film 5, and then transmitted through the beam splitter element 3 again, then reflected by the first composite film 4, and finally the light emitted after being transmitted through the beam splitter element 3 and the second composite film 5 is a ghost light;

[0161] The transmission and reflection ratio of the light splitting element is within a preset range to reduce the ghost rate of the optical module.

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

[0163] Specifically, Figure 2 As shown, the screen 1 is used to emit light. The light is transmitted through the first composite film 4 and the spectroscopic element 3, then reflected by the second composite film 5, and then transmitted through the spectroscopic element 3 again, then reflected by the first composite film 4. Finally, the light emitted after being transmitted through the spectroscopic element 3 and the second composite film 5 is a ghost light.

[0164] The optical module has the function of reducing ghost images, and a beam splitter element 3 is arranged between the first composite film 4 and the second composite film 5. The optical module has different ghost image rates by arranging beam splitters 3 with different transmittance and reflection ratios between the first composite film 4 and the second composite film 5. That is, according to the actual imaging requirements, by arranging beam splitters 3 with different transmittance and reflection ratios between the first composite film 4 and the second composite film 5, the ghost image 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 spectroscopic element 3 is in the range of 40% to 60%, the ghost rate of the optical module decreases as the reflectivity of the spectroscopic element 3 increases, and the ghost rate range of the optical module is: 0.133% to 0.450%.

[0166] In this embodiment, the reflectivity of the light splitting element 3 provided in the optical module is set in the range of 40% to 60%. The selection of this range is based on the specific design requirements of the optical module and the test feedback in actual application.

[0167] Exemplarily, the reflectivity of the beam splitter 3 is less than 40%, the target light intensity of the optical module is small, and the ghost light intensity of the optical module is large. In order to ensure the target light intensity of the optical module, the reflectivity of the beam splitter 3 is set to ≥40%.

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

[0169] Within this range, as the reflectivity of the light splitting element 3 increases, the ghost rate of the optical module will decrease accordingly, because increasing the reflectivity helps reduce multiple reflections of light inside the module, thereby reducing the generation of ghosts.

[0170] Specifically, the reflectivity of the beam splitter element 3 is 40%, and the ghost rate of the optical module is 0.450%. The reflectivity of the beam splitter element 3 is 60%, and the ghost rate of the optical module is 0.133%, that is, as the reflectivity of the beam splitter element 3 increases, the ghost rate of the optical module will decrease accordingly. This also shows that by arranging a beam splitter element 3 with different reflectivity ratios between the first composite film 4 and the second composite film 5, and finding the optimal reflectivity value of the beam splitter element 3 within the range of 40% to 60%, the ghost rate of the optical module can be effectively reduced.

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

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

[0173] It should be noted that Figure 2 The optical architecture of the optical module shown is a basic architecture for realizing a folded optical path. Those skilled in the art can Figure 2 On the basis of the architecture, a film layer is added to realize a more complex folded light path. In different architectures of optical modules, the target light path will be different due to the different types of film layers in the optical module and the different settings of the film layers in the optical module. The above is just a path of ghost light according to a specific architecture diagram of the optical module.

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

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

[0176] In this embodiment, the above-mentioned variation rule exists among the reflectivity of the light-splitting element 3, the target light intensity, and the ghost light intensity.

[0177] According to the above-mentioned variation rule, if the ghost rate is greater than the preset threshold value and the current reflectivity is lower than 50%, then consider increasing the reflectivity to reduce the ghost light intensity and increase the target light intensity, that is, set a spectroscopic element 3 with a larger reflectivity and a reflectivity less than or equal to 50% between the first composite film 4 and the second composite film 5. If the ghost rate is still greater than the preset threshold value, but the current reflectivity is close to or exceeds 50%, it is necessary to weigh the changes in the target light intensity and the ghost light intensity. According to the demand for the target light intensity, a spectroscopic element 3 with a reflectivity greater than 50% can be set 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, a spectroscopic element 3 with different reflectivities is arranged between the first composite film 4 and the second composite film 5, which can effectively reduce the ghost rate of the optical module while maintaining sufficient intensity of the target light.

[0179] In a specific embodiment, the first composite film 4 includes a first anti-reflection film 2, a first phase retarder and a first linear polarizer in sequence along the optical axis from the human eye side to the screen 1 side; the second composite film 5 includes a second anti-reflection film, a second linear polarizer, a reflective polarization element and a second phase retarder in sequence along the optical axis from the human eye side to the screen 1 side.

[0180] In this embodiment, a first composite film 4 is disposed in the optical module, and the specific position of the first composite film 4 may vary according to 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. The circularly polarized light can better resist reflection and scattering, thereby improving the clarity and contrast of imaging.

[0182] The first composite film 4 works together 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 the reflectivity and transmittance as needed, while the first composite film 4 ensures that the outgoing light has the desired polarization state.

[0183] In a more specific embodiment, referring to Figure 2 The first composite film 4 includes a first anti-reflection film 2, a first phase delay plate and a first linear polarizer in sequence from the human eye side to the screen 1 side.

[0184] Specifically, when the light emitted from the screen 1 passes through the first linear polarizer and the first phase retarder in sequence, they work together to convert the linear polarized light into circular polarized light. After the light passes through the first linear polarizer and the first phase retarder in sequence, it further passes through the first anti-reflection film 2, thereby reducing the light reflection loss and improving the imaging quality.

[0185] Exemplarily, the first phase retarder may be a quarter wave plate.

[0186] The second composite film 5 is arranged away from the screen 1 relative to the light splitting element 3 , and the second composite film 5 is used to form a folded light path.

[0187] In this embodiment, by introducing the second composite film 5 and designing an optical module that generates a folded light 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 a second anti-reflection film, a second linear polarizer, a reflective polarization element and a second phase retarder in sequence along the optical axis from the human eye side to the screen 1 side.

[0189] Exemplarily, the second phase retarder may be a quarter wave plate.

[0190] In a specific embodiment, the optical system further includes at least one lens, which is located on any one side of the first composite film 4 , the beam splitting element 3 and the second composite film 5 .

[0191] In a specific embodiment, referring to Figure 2The optical module includes a screen 1, a first lens 6 and a second lens 7, wherein 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 away from the screen 1, and the first composite film 4 includes a first anti-reflection film 2, a first phase retarder and a first linear polarizer in sequence from the human eye side to the screen 1 side.

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

[0193] In the optical module: the path of the target light 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 light path: screen 1-first lens 6-first composite film 4-beam splitter element 3-second lens 7-second composite film 5-second lens 7-beam splitter element 3-first anti-reflection film 2-beam splitter element 3-second lens 7-second composite film 5-human eye.

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

[0196] <System Embodiment>

[0197] The embodiment of the present application also provides a system for reducing the ghosting of an optical module. Device system for reducing the ghosting of an optical module:

[0198] An optical module, comprising a screen 1, a first composite film 4, a beam splitter element 3 and a second composite film 5. The optical module is the above-defined optical module for reducing ghost images.

[0199] The screen 1 is used to emit light, and the light is transmitted through the first composite film 4 and the beam splitter element 3, then reflected by the second composite film 5, and then transmitted through the beam splitter element 3 again, then reflected by the first composite film 4, and finally the light emitted after being transmitted through the beam splitter element 3 and the second composite film 5 is a ghost light;

[0200] An acquisition module, used for acquiring the ghost light intensity and target light intensity of the optical module;

[0201] A calculation module, used for determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity;

[0202] A comparison module, used to determine whether the ghost rate is less than or equal to a preset threshold;

[0203] The adjustment module is used to adjust the transmission-reflection ratio of the light splitting element 3 if the ghost rate is greater than a preset threshold value until the ghost rate is less than or equal to the preset threshold value.

[0204] Therefore, in this embodiment, the ghost light intensity and the target light intensity are obtained by the acquisition module, the ghost rate is calculated by the calculation module, and the transmission and reflection ratio of the spectrometer 3 is adjusted by the adjustment module according to the calculation result, which can significantly reduce the ghost in the optical module and improve the imaging quality.

[0205] <Medium 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. When the computer program is read and executed by the computer, it is used to execute a method for reducing optical module ghosting as in any of the above method embodiments of the present invention.

[0207] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed. In addition, for the device embodiment, since it corresponds to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the corresponding part of the method embodiment. The system embodiment described above is merely illustrative, and the modules described as separate components may or may not be physically separated.

[0208] The present invention may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present invention.

[0209] A computer-readable storage medium may be a tangible device that can hold and store instructions used by an instruction execution device. A computer-readable storage medium may be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples of computer-readable storage media (a non-exhaustive list) include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disk read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination of the foregoing. As used herein, a computer-readable storage medium is not to be interpreted as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through a wire.

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

[0211] The computer program instructions for performing the operation of the present invention may be assembler 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 "C" language or similar programming languages. Computer-readable program instructions may be executed entirely on a user's computer, partially on a user's computer, as an independent software package, partially on a user's computer, partially on a remote computer, or entirely on a remote computer or server. In the case of 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., using an Internet service provider to connect via the Internet). In some embodiments, an electronic circuit, such as a programmable logic circuit, a field programmable gate array (FPGA), or a programmable logic array (PLA), may be personalized by utilizing the state information of the computer-readable program instructions, and the electronic circuit may execute the computer-readable program instructions, thereby realizing various aspects of the present invention.

[0212] Various aspects of the present invention are described herein with reference to the flow charts and / or block diagrams of the methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each box of the flow chart and / or block diagram and the combination of each box in the flow chart and / or block diagram 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 device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device that implements the functions / actions specified in one or more boxes in the flowchart and / or block diagram is generated. These computer-readable program instructions can also be stored in a computer-readable storage medium, and these instructions cause the computer, programmable data processing device, and / or other equipment to work in a specific manner, so that the computer-readable medium storing the instructions includes a manufactured product, which includes instructions for implementing various aspects of the functions / actions specified in one or more boxes in 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 so that a series of operating steps are 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 implement the functions / actions specified in one or more boxes in the flowchart and / or block diagram.

[0215] The flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flow chart or block diagram can represent a part of a module, a program segment or an instruction, and a part of the module, a program segment or an instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in a different order from the order marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flow chart, and the combination of the boxes in the block diagram and / or flow chart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that it is equivalent to implement it by hardware, implement it by software, and implement it by combining software and hardware.

[0216] Embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the marketplace, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the present invention is defined by the appended claims.

Claims

1. A method for reducing ghost images of an optical module, characterized in that: The optical module includes a screen, a first composite film, a light splitting element and a second composite film; The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light; The method comprises: Obtaining ghost light intensity and target light intensity of the optical module; Determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity; Determine whether the ghost rate is less than or equal to a preset threshold; If the ghost rate is greater than a preset threshold, the transmittance-reflection ratio of the light splitting element is adjusted until the ghost 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: The first composite film includes a first anti-reflection film, and obtaining the ghost light intensity of the optical module specifically includes: The ghost light intensity is determined according to the transmittance of the first composite film, the intensity of the light emitted from the screen, the transmittance of the beam splitter element and the reflectance of the first anti-reflection film.

3. The method for reducing optical module ghosting according to claim 2, characterized in that: The ghost light intensity = I*t*a*T 3 ; Wherein I is the intensity of light emitted from the screen, t is the transmittance of the first composite film, a is the reflectivity of the first anti-reflection film, and T is the transmittance of the spectroscopic element.

4. 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: Document classification: ConfidentialDocument classification: ConfidentialThe target light intensity is determined according to the transmittance of the first composite film, the intensity of the light emitted from the screen, and the transmittance and reflectance of the spectroscopic element.

5. The method for reducing optical module ghosting according to claim 4, characterized in that: The target light intensity = I*t*T*R; Wherein 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 spectroscopic element, and R is the reflectivity of the spectroscopic element.

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

7. The method for reducing optical module ghosting according to claim 6, characterized in that: The reflectivity of the light splitting element is in the range of 40% to 60%, and the ghost rate of the optical module is in the range of 0.133% to 0.450%.

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

9. The method for reducing optical module ghosting according to claim 8, characterized in that: When the reflectivity of the beam splitter element is within the range of 50% to 60% and the reflectivity of the beam splitter element increases from A to B, the ghost light intensity corresponding to the reflectivity A of the beam splitter element is I1, and the ghost light intensity corresponding to the reflectivity B of the beam splitter element 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 light splitting element is I3, the target light intensity corresponding to the reflectivity B of the light splitting element is I4, and the reduction rate of the target light intensity is c2=(I3-I4) / I4; Wherein said c1 is greater than said c2.

10. The method for reducing optical module ghosting according to claim 9, characterized in that: The c1 is 10 to 15 times greater than the c2.

11. An optical module for reducing ghosting, characterized in that: The optical module includes a screen, a first composite film, a light splitting element and a second composite film; The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light; The transmission and reflection ratio of the light splitting element is within a preset range to reduce the ghost rate of the optical module.

12. The optical module for reducing ghosting according to claim 11, characterized in that: The preset range is between 2 / 3 and 3 / 2, the reflectivity of the beam splitter element is in the range of 40% to 60%, the ghost rate of the optical module decreases as the reflectivity of the beam splitter element increases, and the ghost rate range of the optical module is: 0.133% to 0.450%.

13. The optical module for reducing ghosting according to claim 11, characterized in that: The screen is used to emit light. The light is transmitted through the first composite film and the beam splitter, then reflected through the second composite film, and then reflected by the beam splitter again and transmitted through the second composite film. The emitted light is the target light.

14. The optical module for reducing ghosting according to claim 13, characterized in that: The reflectivity of the beam splitter element is in the range of 40% to 50%. As the reflectivity of the beam splitter element increases, the intensity of the target light increases and the intensity of the ghost light decreases. The ghost rate range of the optical module is: 0.250% to 0.450%; The reflectivity of the beam splitter element is in the range of 50% to 60%. As the reflectivity of the beam splitter element increases, the intensity of the target light and the intensity of the ghost light both decrease. The ghost rate range of the optical module is: 0.133% to 0.250%.

15. The optical module for reducing ghosting according to claim 11, characterized in that: The first composite film includes a first anti-reflection film, a first phase delay plate and a first linear polarizer in sequence along the optical axis from the human eye side to the screen side; the second composite film includes a second anti-reflection film, a second linear polarizer, a reflective polarization element and a second phase delay plate in sequence along the optical axis from the human eye side to the screen side.

16. The optical module for reducing ghosting according to claim 15, characterized in that: The optical system further comprises at least one lens, which is located on any one side of the first composite film, the beam splitting element and the second composite film.

17. A system for reducing ghost images of an optical module, characterized in that: include: An optical module, comprising a screen, a first composite film, a light splitting element and a second composite film; The screen is used to emit light, and the light is transmitted through the first composite film and the beam splitter element, then reflected by the second composite film, and then transmitted through the beam splitter element again, then reflected by the first composite film, and finally the light emitted after being transmitted through the beam splitter element and the second composite film is a ghost light; An acquisition module, used for acquiring the ghost light intensity and target light intensity of the optical module; A calculation module, used for determining a ghost rate of the optical module according to the ghost light intensity and the target light intensity; A comparison module, used to determine whether the ghost rate is less than or equal to a preset threshold; The adjustment module is used to adjust the transmission and reflection ratio of the light-splitting element if the ghost rate is greater than a preset threshold value until the ghost rate is less than or equal to the preset threshold value.

18. A computer-readable storage medium, characterized in that: Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the method for reducing ghost images of an optical module as described in any one of claims 1-10 is executed.

Images