Optical display assembly and near-eye display device

Abstract

The application provides an optical display assembly and a near-eye display device. The optical display assembly comprises an optical engine module, a display unit, a band-pass filter, a band-stop filter and a driving device. The optical engine module is configured to emit imaging light to the display unit. The band-pass filter is arranged on an optical path between the optical engine module and the display unit. The band-stop filter is arranged on a side of the display unit facing away from the human eye. The driving device is configured to drive the band-pass filter and the band-stop filter to reciprocally deflect. The optical display assembly can make the blocking band of the band-stop filter reciprocally change by driving the band-stop filter to deflect by the driving device. The wave band of ambient light blocked by the band-stop filter is equivalent to narrow to an overlapping part of a first blocking wave band and a second blocking wave band by the visual persistence effect of the human eye. The problem of color cast of a user observing an external environment picture is solved while ensuring the light leakage prevention effect of the band-stop filter.

Description

Technical Field

[0001] This application relates to the field of near-eye display technology, and more particularly to an optical display component and a near-eye display device. Background Technology

[0002] Near-eye display devices, especially augmented reality (AR) devices, inevitably have some of the imaging light escaping to the side of the display unit away from the human eye during the process of projecting imaging light onto the human eye, resulting in light leakage in near-eye displays.

[0003] In related technologies, some near-eye display devices block imaging light from escaping to the side of the display unit away from the human eye by setting a light-blocking filter on the side of the display unit away from the human eye. However, while the light-blocking filter blocks the light leakage of the near-eye display device, it also blocks the corresponding light from the external environment from entering the human eye, causing the external environment image to appear color-distorted in the human eye. Summary of the Invention

[0004] This application provides an optical display component and a near-eye display device, which aims to improve the problem of color distortion in the image when users observe the external environment caused by the band-blocking filter in the near-eye display device.

[0005] In a first aspect, this application provides an optical display component for use in near-eye display devices, comprising: an optomechanical module, a display unit, a bandpass filter, a bandstop filter, and a driving device; wherein...

[0006] The optical engine module is used to emit imaging light to the display unit; the bandpass filter is disposed in the optical path between the optical engine module and the display unit, and the bandstop filter is disposed on the side of the display unit away from the human eye; The driving device is used to drive the bandpass filter and the bandstop filter to reciprocate. When the driving device drives the bandpass filter and the bandstop filter to a first state, the bandpass filter has a first transmission band, the bandstop filter has a first blocking band, and the first blocking band covers a first overlapping band; the first overlapping band is the overlapping portion of the first transmission band and the band of the imaging light. When the driving device drives the bandpass filter and the bandstop filter to the second state, the bandpass filter has a second transmission band, the bandstop filter has a second blocking band, and the second blocking band covers the second overlapping band; the second overlapping band is the overlapping portion of the second transmission band and the band of the imaging light. The first blocking band and the second blocking band do not overlap at least partially.

[0007] The aforementioned optical display component, by setting a driving device to drive the bandstop filter to deflect, can cause the blocking wavelength of the bandstop filter to change back and forth. By utilizing the persistence of vision of the human eye, the wavelength of ambient light blocked by the bandstop filter is effectively narrowed to the overlapping part of the first blocking wavelength and the second blocking wavelength. At the same time, the driving device drives the bandpass filter to deflect back and forth to prevent the imaging light from escaping when the bandstop filter deflects. This achieves the improvement of the color distortion problem when the user observes the external environment while ensuring the anti-light leakage effect of the bandstop filter.

[0008] In one possible implementation, the first blocking band and the second blocking band do not overlap.

[0009] In one possible implementation, the center wavelength and bandwidth of the first transmission band and the first blocking band are equal, and the center wavelength and bandwidth of the second transmission band and the second blocking band are equal.

[0010] In one possible implementation, there is a first steady-state period and a second steady-state period within a reciprocating deflection cycle; During the first steady-state period, the bandpass filter and the bandstop filter remain in the first state; during the second steady-state period, the bandpass filter and the bandstop filter remain in the second state.

[0011] In one possible implementation, the reciprocating deflection frequency of the bandpass filter and the bandstop filter is not less than 50 Hz.

[0012] In one possible implementation, the driving device includes a first driving component and a second driving component; The first driving component is used to drive the bandpass filter to deflect, and the second driving component is used to drive the bandstop filter to deflect.

[0013] In one possible implementation, the first driving component and / or the second driving component are a set of piezoelectric ceramic actuators spaced apart. The piezoelectric ceramic actuators are respectively disposed at opposite ends of the bandpass filter and / or the bandstop filter.

[0014] In one possible implementation, when the bandpass filter and / or the bandstop filter are in the first state and the second state, the imaging rays are all located on the same side of the normal of the bandpass filter and / or the bandstop filter, and the angle between the imaging rays and the normal of the bandpass filter and / or the bandstop filter is greater than 0°.

[0015] In one possible implementation, the display unit is configured such that the angle between the imaging light rays escaping toward the side opposite to the human eye and the normal of the display unit is greater than 0°.

[0016] Secondly, this application provides a near-eye display device, including a device body and an optical display component as described above disposed on the device body.

[0017] The aforementioned near-eye display device, by setting a driving device for the optical display components to drive the bandstop filter to deflect, can cause the blocking wavelength of the bandstop filter to change back and forth. By utilizing the persistence of vision of the human eye, the wavelength of ambient light blocked by the bandstop filter is effectively narrowed to the overlapping part of the first blocking wavelength and the second blocking wavelength. At the same time, the driving device drives the bandpass filter to deflect back and forth to prevent the imaging light from escaping when the bandstop filter deflects. This achieves the improvement of the color distortion problem when the user observes the external environment while ensuring the anti-light leakage effect of the bandstop filter. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. These drawings are incorporated in and constitute a part of this specification. They illustrate embodiments conforming to this disclosure and, together with the specification, serve to explain the technical solutions of this disclosure. It should be understood that the following drawings only show some embodiments of this disclosure and should not be considered as limiting the scope. Those skilled in the art can obtain other related drawings based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall optical display component in an embodiment of this application; Figure 2 This is a schematic diagram of the transmission band shift of the bandpass filter in the embodiments of this application; Figure 3 This is a schematic diagram of the blocking band shift of the banded filter in the embodiments of this application; Figure 4 This is a schematic diagram showing the imaging ray and the bandpass filter forming a certain angle in an embodiment of this application; Figure 5 This is a schematic diagram showing the imaging light rays forming a certain angle with the bandstop filter in an embodiment of this application; Figure 6 This is a schematic diagram of the bandpass filter in the first and second states in the embodiments of this application; Figure 7 This is a schematic diagram showing the imaging light beam escaping from the display unit at an angle and forming a certain angle with the bandstop filter in an embodiment of this application. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the application will now be described in further detail with reference to the accompanying drawings.

[0021] It should be noted that, unless otherwise defined, the technical or scientific terms used in one or more embodiments of this specification should have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms "first," "second," and similar words used in one or more embodiments of this specification do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0022] To facilitate understanding of the optical display components and near-eye display devices provided in the embodiments of this application, their application scenarios are first described. The optical display devices provided in the embodiments of this application are used in near-eye display devices, and in particular, can be used as projection imaging components for near-eye display devices such as augmented reality glasses.

[0023] Near-eye display devices, especially augmented reality (AR) devices, inevitably have some of the imaging light escaping to the side of the display unit away from the human eye during the process of projecting imaging light onto the human eye, resulting in light leakage in near-eye displays.

[0024] In related technologies, some near-eye display devices block imaging light from escaping to the side of the display unit away from the human eye by setting a light-blocking filter on the side of the display unit away from the human eye. However, while the light-blocking filter blocks the light leakage of the near-eye display device, it also blocks the corresponding light from the external environment from entering the human eye, causing the external environment image to appear color-distorted in the human eye.

[0025] Based on this, this application provides an optical display component and a near-eye display device, aiming to improve the problem of color distortion in the user's view of the external environment caused by the band-stop filter in the near-eye display device. The optical display component provided in the embodiments of this application is described in detail below with reference to the accompanying drawings.

[0026] refer to Figure 1 , Figure 1 This is a schematic diagram of the overall optical display component in an embodiment of this application.

[0027] The optical display assembly provided in this application embodiment can be applied to near-eye display devices. The optical display assembly includes an optomechanical module 1, a display unit 2, a bandpass filter 3, and a bandstop filter 4. These components are arranged in a specific order along the optical path. Specifically, the optomechanical module 1 emits imaging light rays, which pass through the bandpass filter 3 and then enter the display unit 2. After entering the display unit 2, the imaging light rays propagate within the display unit 2 in a specific direction and are projected onto the human eye. While the imaging light rays exit from the side of the display unit 2 facing the human eye and are projected onto the human eye, some imaging light rays also exit from the side of the display unit 2 away from the human eye, causing light leakage from the display unit 2. The bandstop filter 4 is used to block the imaging light rays exiting from the side of the display unit 2 away from the human eye.

[0028] The optical-mechanical module 1, acting as an image source, can be a miniature OLED (Organic Electroluminescence Display), a laser scanning display, or an LCD (Liquid Crystal Display) projection module, etc. It generates imaging light rays containing specific wavelengths to form virtual images. These specific wavelengths of imaging light can be a single band of visible light, or a combination of several bands of visible light. For example, for a color display, the imaging light rays can be a combination of red, green, and blue light bands.

[0029] Display unit 2 is typically an optical combiner, such as an optical waveguide, prism, or freeform mirror. Its function is to transmit, expand, and ultimately project the imaging light emitted from the optomechanical module 1 into the human eye. Due to optical design limitations, while the display unit 2 guides the light to the human eye, a small portion of the imaging light leaks to the side away from the human eye; this is known as "light leakage."

[0030] A bandpass filter 3 is disposed in the optical path between the optomechanical module 1 and the display unit 2. The bandpass filter only allows light of a specific wavelength band to pass through efficiently, while strongly attenuating light of other wavelength bands. For ease of description, in this embodiment, the specific wavelength band that the bandpass filter allows light to pass through efficiently is referred to as the transmission wavelength band.

[0031] A band-blocking filter 4 is positioned on the side of the display unit 2 away from the viewer's eyes. The function of the band-blocking filter 4 is to block light of a specific wavelength from passing through. Its core function is to intercept imaging light escaping from the display unit 2, that is, to block light leakage and prevent it from interfering with the outside world or causing privacy leaks.

[0032] When the bandpass filter 3 and the bandstop filter 4 are specifically configured, the transmission band and the imaging light band at least partially overlap, and the blocking band covers the overlapping part of the transmission band and the imaging light band. Under this configuration, at least part of the imaging light can penetrate the bandpass filter 3 and reach the display unit 2. This part of the imaging light will also produce light leakage when it is projected to the human eye. The bandstop filter is used to block this light leakage from escaping into the external environment.

[0033] Please refer to the above. Figure 2 and Figure 3 , Figure 2 This is a schematic diagram of the transmission band shift of the bandpass filter in the embodiments of this application. Figure 3 This is a schematic diagram of the blocking band shift of the band filter in the embodiments of this application. Figure 2 and Figure 3 In the diagram, the solid and dashed lines represent the spectral characteristics of the bandpass filter 3 and the bandstop filter 4 in the first and second states, respectively.

[0034] The optical display assembly provided in this embodiment also includes a driving device 5, which drives the bandpass filter 3 and the bandstop filter 4 to reciprocate. The driving device 5 can drive the bandpass filter 3 and the bandstop filter 4 to deflect synchronously or asynchronously. This deflection changes the angle at which the imaging light is incident on the bandpass filter 3 or the bandstop filter 4. According to the interference principle of optical thin films, the center wavelength of the transmission band and the center wavelength of the blocking band will shift towards shorter wavelengths as the incident angle increases. Therefore, by controlling the deflection angle, the transmission band of the bandpass filter 3 and the blocking band of the bandstop filter 4 can be dynamically changed.

[0035] The bandpass filter 3 and the bandstop filter 4 can be in a first state and a second state. Here, the first state or the second state refers to the combination of the states of the bandpass filter 3 and the bandstop filter 4 at the same time. Specifically, the difference between the first state and the second state is that the incident direction of the imaging light is different due to the deflection of the bandpass filter 3 and the bandstop filter 4.

[0036] When the driving device 5 drives the bandpass filter 3 and the bandstop filter 4 to the first state, the bandpass filter 3 has a first transmission band and the bandstop filter 4 has a first blocking band; the first transmission band at least partially overlaps with the band of the imaging light, the overlapping part of the first transmission band and the band of the imaging light is the first overlapping band, and the first blocking band covers the first overlapping band.

[0037] It is worth noting that the first overlapping band here can be a single band or a combination of several bands. For example, if the imaging light includes red, green, and blue imaging light, the first transmission band of the bandpass filter 3 also includes three segments corresponding to the three colors of red, green, and blue, the first overlapping band also includes three segments corresponding to the three colors of red, green, and blue, and the first blocking band also includes three segments corresponding to the three colors of red, green, and blue.

[0038] Imaging light located in the first overlapping band can be incident on the display unit 2, and some of the imaging light located in the first overlapping band will be scattered to the side of the display unit 2 away from the human eye. The imaging light scattered to the side of the display unit 2 away from the human eye will be blocked by the first blocking band to prevent light leakage.

[0039] When the driving device 5 drives the bandpass filter 3 and the bandstop filter 4 to the second state, the bandpass filter 3 has a second transmission band and the bandstop filter 4 has a second blocking band; the second transmission band at least partially overlaps with the band of the imaging light, the overlapping part of the second transmission band and the band of the imaging light is the second overlapping band, and the second blocking band covers the second overlapping band.

[0040] It is worth noting that the second overlapping band here can be a single band or a combination of several bands. For example, if the imaging light includes red, green, and blue imaging light, the second transmission band of the bandpass filter 3 also includes three segments corresponding to the three colors of red, green, and blue, the second overlapping band also includes three segments corresponding to the three colors of red, green, and blue, and the second blocking band also includes three segments corresponding to the three colors of red, green, and blue.

[0041] Imaging light located in the second overlapping band can be incident on the display unit 2, and some of the imaging light located in the second overlapping band will escape to the side of the display unit 2 away from the human eye. The imaging light that escapes to the side of the display unit 2 away from the human eye will be blocked by the second blocking band to prevent light leakage.

[0042] In this embodiment, the first blocking band and the second blocking band do not overlap at least partially. That is, when the driving device 5 drives the band-stop filter 4 to rotate to the first state and the second state, the incident angle of the imaging light on the band-stop filter 4 is different. When the blocking band of the band-stop filter 4 is shifted, the bandpass filter 3 also needs to be driven to deflect accordingly, so that the bandpass band is shifted accordingly to meet the condition that the bandpass band is covered by the blocking band.

[0043] When the band-stop filter 4 is in its first state, light in the first blocking band of the external environment is blocked and cannot enter the human eye. When the band-stop filter 4 is in its second state, light in the second blocking band of the external environment is blocked and cannot enter the human eye. That is, within one deflection cycle of the band-stop filter 4, for a certain period of time, the portion of visible light from the external environment excluding the first blocking band can enter the human eye, and for a certain period of time, the portion of visible light from the external environment excluding the second blocking band can enter the human eye. Thus, during the repeated deflection of the band-stop filter 4, due to the persistence of vision effect, the light in the non-overlapping portions of the first and second blocking bands can enter the human eye, while the light in the overlapping portions of the first and second blocking bands cannot enter the human eye.

[0044] Since the first blocking band and the second blocking band do not overlap at least partially, the bandwidth of the overlapping portion of the first blocking band and the second blocking band must be smaller than the bandwidth of the first blocking band and the second blocking band. Therefore, by driving the band-stop filter 4 to deflect repeatedly in this way, the blocking band bandwidth of the band-stop filter 4 for ambient light can be effectively narrowed, thereby improving the problem of color distortion in the user's view of the external environment caused by setting the band-stop filter 4 in the near-eye display device.

[0045] It should be understood that the first blocking band and the second blocking band do not overlap at least partially, including both cases where the first blocking band and the second blocking band partially overlap and cases where the first blocking band and the second blocking band do not overlap.

[0046] As an optional implementation, when specifically setting the driving device 5, bandpass filter 3, and bandstop filter 4, the driving device 5, bandpass filter 3, and bandstop filter 4 are configured such that the first blocking band and the second blocking band do not overlap. That is, the first blocking band and the second blocking band have no overlapping portions in the spectrum.

[0047] This design ensures that the bandstop filter 4 blocks completely different ambient light wavelengths in the first and second states. Due to the persistence of vision in the human eye, this is equivalent to the ambient light visible wavelengths that are not continuously blocked, which can approximately eliminate color cast and further improve the problem of color cast when users observe the external environment.

[0048] In summary, the aforementioned optical display component, by setting the driving device 5 to drive the bandstop filter 4 to deflect, can cause the blocking wavelength of the bandstop filter 4 to change back and forth. By utilizing the persistence of vision of the human eye, the wavelength of ambient light blocked by the bandstop filter 4 is effectively narrowed to the overlapping part of the first blocking wavelength and the second blocking wavelength. At the same time, in conjunction with the driving device 5 to drive the bandpass filter 3 to deflect back and forth, it prevents the imaging light from escaping when the bandstop filter 4 deflects. This achieves the improvement of the color distortion problem when the user observes the external environment while ensuring the anti-light leakage effect of the bandstop filter 4.

[0049] As an optional implementation, there are a first steady-state period and a second steady-state period within one reciprocating deflection cycle; during the first steady-state period, the bandpass filter 3 and the bandstop filter 4 remain in the first state; during the second steady-state period, the bandpass filter 3 and the bandstop filter 4 remain in the second state. That is, if the phase-time curve of the bandstop filter 4 or the bandpass filter 3 is plotted with the phase and time as the axis, the curve will show a shape similar to a trapezoidal wave or a sine wave with flattened peaks. Specifically, taking the bandstop filter 4 as an example, the bandstop filter 4 will have a cyclical motion of "residing in the first state, rotating to the second state, residing in the second state, and rotating to the first state".

[0050] During the first and second steady-state periods, the entire optical display assembly remains in a stable state. By setting the first and second steady-state periods, the risk of imaging flicker or ambient light modulation interference caused by spectral instability during the angle switching transition of the bandpass filter 3 or the bandstop filter 4 can be reduced.

[0051] As an optional implementation, the reciprocating deflection frequency of the bandpass filter 3 and the bandstop filter 4 is not less than 50 Hz. The critical flicker frequency of the human eye is usually in the tens of hertz. By setting the reciprocating deflection frequency of the bandpass filter 3 and the bandstop filter 4 to be greater than or equal to 50 Hz, the perceptibility of the deflection switching of the bandpass filter 3 and the bandstop filter 4 can be reduced, making it less likely for users to observe the color flicker caused by the switching of the bandpass filter 3 and the bandstop filter 4, thereby helping to improve the display effect of the optical display components.

[0052] As an optional implementation, the driving device 5, bandpass filter 3, and bandstop filter 4 can also be configured such that the first bandpass band and the second bandpass band respectively cover both sides of the center wavelength of the imaging light and are adjacent to the centerline band of the imaging light, or at least one of the first bandpass band and the second bandpass band covers the center wavelength of the imaging light. It should be understood that, when the imaging light has multiple color bands, the bands corresponding to each color in the first and second bandpass bands are both on both sides of the center wavelength of the corresponding color of the imaging light, or at least one of the bands of each color in the first and second bandpass bands covers the center wavelength of the corresponding color of the imaging light.

[0053] For imaging light, the light intensity of each color of imaging light generally exhibits an approximately normal distribution relative to the center wavelength. By setting the first bandpass band and the second bandpass band to cover both sides of the center wavelength of the imaging light and adjacent to the midline band of the imaging light, or by setting at least one of the first bandpass band and the second bandpass band to cover the center wavelength of the imaging light, the convergence effect of the bandpass filter 3 on the imaging light band can be reduced, thereby improving the display effect of the display component.

[0054] As an optional implementation, the center wavelengths and bandwidths of the first transmission band and the first blocking band are equal, as are the center wavelengths and bandwidths of the second transmission band and the second blocking band. This paired design of the bandpass filter 3 and the bandstop filter 4 simplifies the design and fabrication of optical thin films. In any state, the bandpass filter 3 and the bandstop filter 4 can be considered as "complementary filters" for the same center wavelength, which simplifies the synchronization control logic of the driving device 5.

[0055] Please refer to the above. Figure 4 and Figure 5 , Figure 4 This is a schematic diagram illustrating the angle between the imaging ray and the bandpass filter in an embodiment of this application. Figure 5 This is a schematic diagram showing that the imaging light rays and the bandstop filter form a certain angle in an embodiment of this application. Figure 4 and Figure 5 In the diagram, A represents the imaging light emitted by the optical engine module, B represents the light entering the human eye from the external environment, and C represents the imaging light escaping from the side of the display unit away from the human eye.

[0056] As an optional implementation, when the bandpass filter 3 and / or the bandstop filter 4 are in the first state and the second state, the imaging rays are all located on the same side of the normal of the bandpass filter 3 and / or the bandstop filter 4, and the angle between the imaging rays and the normal of the bandpass filter 3 and / or the bandstop filter 4 is greater than 0°.

[0057] refer to Figure 6 , Figure 6This is a schematic diagram of the bandpass filter in the first and second states in an embodiment of this application. Taking bandpass filter 3 as an example, Figure 6 The bandpass filter 3, indicated by the solid line, is in the first state, at which time the normal of the bandpass filter 3 is n; Figure 6 The bandpass filter 3', indicated by the dashed line, is in its second state, at which point the normal to the bandpass filter 3' is n'. (From...) Figure 6 It is easy to see that when the bandpass filter 3 is in the first and second states, the imaging ray A is located on the same side of the normal of the bandpass filter 3. The bandstop filter 4 can be the same as or similar in form to the bandpass filter 3, and will not be described further here.

[0058] For the bandpass filter 3 and the bandstop filter 4, the changes in their transmission band and blocking band with the angle of incidence of light are not linear, but rather approximately exponential. The larger the angle of incidence of light, the more obvious the shift in the transmission band and blocking band will be when the light is deflected by the same angle.

[0059] Regarding the bandpass filter 3, by setting the imaging rays to be all located on the same side of the normal of the bandpass filter 3 and the angle between the imaging rays and the normal of the bandpass filter 3 is greater than 0°, it is equivalent to the imaging rays having an initial angle with the bandpass filter 3 before the bandpass filter 3 is deflected. This allows the bandpass filter 3 to obtain a larger offset of the transmission band at a smaller angle.

[0060] Regarding the bandstop filter 4, by setting the imaging rays to be all located on the same side of the normal of the bandstop filter 4 and the angle between the imaging rays and the normal of the bandstop filter 4 is greater than 0°, it is equivalent to the imaging rays having an initial angle with the bandstop filter 4 before the bandstop filter 4 is deflected. This allows the bandstop filter 4 to obtain a larger offset of the blocking band at a smaller angle.

[0061] This configuration can improve the efficiency of the drive components in adjusting the shift of the transmission band and the blocking band.

[0062] Optionally, in the first and second states of the bandpass filter 3, in the state where the incident angle of the imaging light on the bandpass filter 3 is smaller, the incident angle of the imaging light on the bandpass filter 3 is greater than or equal to 30°; similarly, in the first and second states of the bandstop filter 4, in the state where the incident angle of the imaging light on the bandstop filter 4 is smaller, the incident angle of the imaging light on the bandstop filter 4 is greater than or equal to 30°. This configuration can further improve the adjustment efficiency of the driving component for the shift in the transmission and blocking bands.

[0063] Please refer to the above. Figure 7 , Figure 7This is a schematic diagram showing the imaging light beam escaping from the display unit at an angle and forming a certain angle with the bandstop filter in an embodiment of this application.

[0064] As an optional implementation, the display unit 2 is configured such that the angle between the imaging ray emanating towards the side opposite to the human eye and the normal of the display unit 2 is greater than 0°. Here, the angle between the imaging ray and the normal of the display unit 2 should be on the same side of the normal of the display unit 2 as the initial angle between the bandstop filter 4 and the imaging ray. The angle between the imaging ray and the normal of the display unit 2 can be specifically achieved through the optical structure design of the display unit 2.

[0065] For the bandstop filter 4, if an initial angle is to be provided for the bandstop filter 4 as described above, one way is to make the bandstop filter 4 deflect relative to the display unit 2 by an initial angle while the imaging light is perpendicularly emitted from the display unit 2. Another way is to make the imaging light deflect by an initial angle while keeping the bandstop filter 4 parallel to the display unit 2.

[0066] By setting the angle between the imaging ray escaping towards the side away from the human eye and the normal of the display unit 2 to be greater than 0°, the bandstop filter 4 can be made parallel to the display unit 2 or offset from the display unit 2 by a small angle to meet the initial angle requirement between the imaging ray and the bandstop filter 4, which is beneficial to reduce the miniaturization design of optical display components.

[0067] Optionally, when specifically configuring the bandstop filter 4, the angle between the bandstop filter 4 and the display unit 2 is less than or equal to 10°. This configuration keeps the combination of the display unit and the bandstop filter 4 within a small thickness space, thus facilitating the miniaturization design of near-eye display devices.

[0068] As an optional implementation, the driving device 5 includes a first driving component 51 and a second driving component 52; the first driving component 51 is used to drive the bandpass filter 3 to deflect, and the second driving component 52 is used to drive the bandstop filter 4 to deflect. The first driving component 51 and the second driving component 52 can be the same or different in form, and the first driving component 51 and the second driving component 52 can be driven by various methods such as electromagnetic driving, electrode driving, or piezoelectric ceramic driving.

[0069] By setting the first driving component 51 and the second driving component 52, independent driving of the bandpass filter 3 and the bandstop filter 4 can be achieved, providing maximum control flexibility. The deflection amplitude, phase, or steady-state duration of the bandpass filter 3 and the bandstop filter 4 can be adjusted independently to precisely optimize the transmission spectrum of the imaging optical path and the equivalent blocking spectrum of ambient light. This can improve the tuning capability of the optical display components when dealing with different optomechanical spectral characteristics or different ambient light compensation requirements.

[0070] As an optional implementation, the first driving component 51 and / or the second driving component 52 are a set of piezoelectric ceramic actuators arranged at intervals; the piezoelectric ceramic actuators are respectively disposed at opposite ends of the bandpass filter 3 and / or the bandstop filter 4.

[0071] By applying differentiated voltages to the piezoelectric ceramics at opposite ends of the bandpass filter 3 and / or the bandstop filter 4, they can bend or twist, thereby achieving precise micro-angle deflection. Piezoelectric ceramic actuators offer advantages such as fast response speed, precise displacement control, low power consumption, and compact structure.

[0072] This application also provides a near-eye display device, including a device body and an optical display component as described above disposed on the device body.

[0073] The aforementioned near-eye display device, by setting a driving device for the optical display components to drive the bandstop filter to deflect, can cause the blocking wavelength of the bandstop filter to change back and forth. By utilizing the persistence of vision of the human eye, the wavelength of ambient light blocked by the bandstop filter is effectively narrowed to the overlapping part of the first blocking wavelength and the second blocking wavelength. At the same time, the driving device drives the bandpass filter to deflect back and forth to prevent the imaging light from escaping when the bandstop filter deflects. This achieves the improvement of the color distortion problem when the user observes the external environment while ensuring the anti-light leakage effect of the bandstop filter.

[0074] One or more embodiments of this specification are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of one or more embodiments of this specification should be included within the scope of protection of this disclosure.

[0075] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical display component for use in near-eye display devices, characterized in that, include: The optical-mechanical module, display unit, bandpass filter, bandstop filter, and driving device are included. The optical engine module is used to emit imaging light to the display unit; the bandpass filter is disposed in the optical path between the optical engine module and the display unit, and the bandstop filter is disposed on the side of the display unit away from the human eye; The driving device is used to drive the bandpass filter and the bandstop filter to reciprocate. When the driving device drives the bandpass filter and the bandstop filter to a first state, the bandpass filter has a first transmission band, the bandstop filter has a first blocking band, and the first blocking band covers a first overlapping band; the first overlapping band is the overlapping portion of the first transmission band and the band of the imaging light. When the driving device drives the bandpass filter and the bandstop filter to the second state, the bandpass filter has a second transmission band, the bandstop filter has a second blocking band, and the second blocking band covers the second overlapping band; the second overlapping band is the overlapping portion of the second transmission band and the band of the imaging light. The first blocking band and the second blocking band do not overlap at least partially.

2. The optical display component according to claim 1, characterized in that, The first blocking band and the second blocking band do not overlap.

3. The optical display component according to claim 1, characterized in that, The center wavelength and bandwidth of the first transmission band and the first blocking band are equal, and the center wavelength and bandwidth of the second transmission band and the second blocking band are equal.

4. The optical display component according to claim 1, characterized in that, Within a reciprocating deflection cycle, there is a first steady-state period and a second steady-state period; During the first steady-state period, the bandpass filter and the bandstop filter remain in the first state; During the second steady-state period, the bandpass filter and the bandstop filter remain in the second state.

5. The optical display assembly according to claim 4, characterized in that, The reciprocating deflection frequency of the bandpass filter and the bandstop filter is not less than 50 Hz.

6. The optical display assembly according to claim 1, characterized in that, The driving device includes a first driving component and a second driving component; The first driving component is used to drive the bandpass filter to deflect, and the second driving component is used to drive the bandstop filter to deflect.

7. The optical display component according to claim 6, characterized in that, The first driving component and / or the second driving component are a set of piezoelectric ceramic actuators arranged at intervals; The piezoelectric ceramic actuators are respectively disposed at opposite ends of the bandpass filter and / or the bandstop filter.

8. The optical display component according to any one of claims 1 to 7, characterized in that, When the bandpass filter and / or the bandstop filter are in the first state and the second state, the imaging rays are all located on the same side of the normal of the bandpass filter and / or the bandstop filter, and the angle between the imaging rays and the normal of the bandpass filter and / or the bandstop filter is greater than 0°.

9. The optical display assembly according to claim 8, characterized in that, The display unit is configured such that the angle between the imaging light rays escaping toward the side opposite to the human eye and the normal of the display unit is greater than 0°.

10. A near-eye display device, characterized in that, It includes a device body and an optical display component as described in any one of claims 1 to 9 disposed on the device body.

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