CN213780542U - Display optical system for correcting chromatic aberration and head-mounted display device - Google Patents
Display optical system for correcting chromatic aberration and head-mounted display device Download PDFInfo
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- CN213780542U CN213780542U CN202022413466.8U CN202022413466U CN213780542U CN 213780542 U CN213780542 U CN 213780542U CN 202022413466 U CN202022413466 U CN 202022413466U CN 213780542 U CN213780542 U CN 213780542U
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Abstract
The utility model discloses a correct display optical system and head mounted display device of colour difference, wherein, correct display optical system of colour difference, include: a display screen; the lens is arranged on one side of the display screen; a correction element, the curvature of the surface of the correction element facing the display screen being the same as the curvature of the surface of the correction element facing away from the display screen, and the correction element having opposite dispersion characteristics to the lens; the correcting element is arranged on one side of the lens, which is far away from the display screen, or the correcting element is arranged on one side of the lens, which is far towards the display screen. The utility model discloses technical scheme compensates the chromatic aberration of lens through the correcting element who has the dispersion characteristic opposite with lens, effectively eliminates the chromatic aberration, improves display optical system's image quality.
Description
Technical Field
The utility model relates to an optical display technical field, in particular to display optical system and wear display device who rectifies colour difference.
Background
In near eye display (ned) or head mounted display (hmd) optical systems, resin lenses are often used to meet the requirement of light weight. For example, in virtual reality vr (virtual reality), the optical system has a transparent scheme and a polarization-based folded optics (also called a pancake scheme), in the former scheme, the common optical path structure is composed of a fresnel lens or an aspheric lens; in the latter solution, the common optical path structure is composed of one or two lenses.
For the one-piece lens solution, the inherent dispersion of the material causes the primary image to have a relatively significant chromatic aberration, particularly with positional chromatic aberration. For the two-piece lens scheme, although chromatic aberration can be reduced by selecting materials with different dispersion properties, the selection range of resin materials is smaller; moreover, the two lenses need to have good birefringence performance, otherwise serious ghost image can be caused in the polarization light path; at the same time, two lenses also mean a heavier module weight and thus become an obstacle to the market of the product.
SUMMERY OF THE UTILITY MODEL
The main objective of the present invention is to provide a display optical system for correcting chromatic aberration, which aims to compensate the chromatic aberration of a lens by a correction element having a chromatic dispersion characteristic opposite to that of the lens, effectively eliminate the chromatic aberration, and improve the image quality of the display optical system.
To achieve the above object, the present invention provides a display optical system for correcting chromatic aberration, including: a display screen; the lens is arranged on one side of the display screen; a correction element, the curvature of the surface of the correction element facing the display screen being the same as the curvature of the surface of the correction element facing away from the display screen, and the correction element having opposite dispersion characteristics to the lens; the correcting element is arranged on one side of the lens, which is far away from the display screen, or the correcting element is arranged on one side of the lens, which is far towards the display screen.
Optionally, the display optical system for correcting chromatic aberration further includes a polarizer, a first polarization conversion element, a partially transmissive partially reflective element, a second polarization conversion element, and a polarization splitting element, which are sequentially disposed; wherein the lens is disposed between the partially transmissive partially reflective element and the second polarization converting element; the correction element is arranged between the lens and the second polarization conversion element, or the correction element is arranged between the second polarization conversion element and the polarization splitting element, or the correction element is arranged on one side of the polarization splitting element, which is far away from the second polarization conversion element.
Optionally, the curvature of the surface of the correction element facing the display screen is the same as the curvature of the surface of the lens facing away from the display screen, and every two adjacent elements of the lens, the second polarization conversion element, the polarization beam splitting element and the correction element are attached to each other.
Optionally, in the lens, the second polarization conversion element, the polarization beam splitting element, and the correction element, an optical glue is filled between every two adjacent elements.
Optionally, the correction element is disposed between the lens and the second polarization conversion element, or the correction element is disposed between the second polarization conversion element and the polarization splitting element; the display optical system for correcting chromatic aberration further comprises a protection element, and the protection element is attached to the surface, deviating from the display screen, of the polarization light splitting element.
Optionally, the correcting element is disposed on a side of the polarization splitting element away from the second polarization conversion element, and an antireflection film is disposed on a surface of the correcting element away from the polarization splitting element.
Optionally, the correction element is disposed between the second polarization conversion element and the polarization splitting element, the lens, the second polarization conversion element and the correction element are sequentially attached to each other, an air gap is disposed between the polarization splitting element and the correction element, and an antireflection film is disposed on a surface of the correction element facing the polarization splitting element.
Optionally, the correction element is disposed on a side of the lens facing the display screen, a curvature of a surface of the correction element facing away from the display screen is the same as a curvature of a surface of the lens facing the display screen, the correction element is attached to the lens, and an antireflection film is disposed on a surface of the correction element facing the display.
Optionally, the display optical system for correcting chromatic aberration further includes a polarizer, a first polarization conversion element, a partially transmissive partially reflective element, a second polarization conversion element, and a polarization splitting element, which are sequentially disposed; the correcting element is arranged between the partial transmission part reflecting element and the second polarization conversion element, the curvature of the surface of the correcting element departing from the display screen is the same as the curvature of the surface of the lens facing the display screen, and the correcting element, the second polarization conversion element and the lens are sequentially attached.
In order to achieve the above object, the present invention further provides a head-mounted display device for correcting chromatic aberration, including: a head-mounted body; and the display optical system for correcting chromatic aberration is arranged in the head-wearing main body.
The utility model discloses among the technical scheme, the adoption sets up correcting element towards the display screen or the one side that deviates from the display screen at lens, and correcting element is the same towards the curvature on the surface of display screen and the curvature that correcting element deviates from the surface of display screen, and correcting element has the dispersion characteristic opposite with lens. Because the correcting element has no diopter (namely the curvatures of the front surface and the rear surface of the correcting element are the same), when the display optical system for correcting chromatic aberration is applied to a direct transmission type optical path or a folding optical path, the trend of light rays in the original optical path structure cannot be influenced, so that the optical performance of the original optical path structure can be ensured; meanwhile, the correcting element without diopter (namely, the curvatures of the front and rear surfaces are the same) has positive chromatic aberration which is related to refractive index, thickness and Abbe number, and the convex lens has negative chromatic aberration, so that a proper material and thickness can be selected for the correcting element based on a corresponding chromatic aberration calculation formula, such as primary Seidel aberration and high-level chromatic aberration, and the correcting element has a dispersion characteristic opposite to that of the lens.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic diagram of a basic folded optical path;
FIG. 2 is a diagram of an embodiment of a display optical system for correcting chromatic aberration according to the present invention;
fig. 3 is a schematic structural diagram of a partially transmissive partially reflective element, a correcting element, a second polarization conversion element and a polarization beam splitter in another embodiment of the display optical system for correcting chromatic aberration according to the present invention;
FIG. 4 is a schematic structural diagram of a display optical system for correcting chromatic aberration according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a partially transmissive partially reflective element, a correcting element, a second polarization conversion element and a polarization splitting element in a further embodiment of the display optical system for correcting chromatic aberration according to the present invention.
The reference numbers illustrate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a display optical system 100 of correction chromatic aberration.
In an embodiment of the present invention, referring to fig. 1 to 2, the display optical system 100 for correcting chromatic aberration includes: a display screen 10; the lens 40, the lens 40 locates one side of the display screen 10; a correction element 70, the curvature of the surface of the correction element 70 facing the display screen 10 being the same as the curvature of the surface of the correction element 70 facing away from the display screen 10, and the correction element 70 having an opposite dispersion characteristic to the lens 40; wherein the correction element 70 is arranged on a side of the lens 40 facing away from the display screen 10, or the correction element 70 is arranged on a side of the lens 40 facing towards the display screen 10.
It should be noted that the display optical system 100 for correcting chromatic aberration of the present invention can be applied to both a direct-transmission optical path and a folding optical path. The correcting element has no diopter (i.e. the curvatures of the front and back surfaces of the correcting element 70 are the same), so that the trend of light rays in the original light path structure is not influenced, and the normal operation of the original light path structure can be ensured.
Alternatively, the material of the correction element 70 is glass, resin, or an optical film. The material of the correcting element 70 is preferably glass. As can be seen from the coating process, a better coating effect can be generally achieved at a high temperature, because the substrate is pretreated, the activation is firstly performed, the chemical bond force between the substrate and the coating material is increased, the bonding force between the coating layer and the substrate is improved, and the absorption of the substrate impurity gas and the high refractive index coating material is reduced, in addition, some low-refraction materials used as an antireflection film, such as magnesium fluoride (MgF2), are only suitable for high-temperature deposition, and glass generally has better high-temperature resistance, so that the correction element 70 is made of glass, and can achieve lower interface reflection and better reliability of the coating material compared with resin and optical films.
By selecting a suitable material for the correction element 70, the chromatic aberration of the display optical system can be additionally corrected without affecting the existing optical performance. Specifically, the correction element 70 of a flat type or without diopter (i.e., the curvatures of the front and rear surfaces are the same) has a positional chromatic aberration that is a positive chromatic aberration in relation to the refractive index, the thickness and the abbe number, and the convex lens 40 has a negative positional chromatic aberration, so that an appropriate material and thickness can be selected based on the corresponding chromatic aberration calculation formula such as the primary seidel aberration and the high-order chromatic aberration, so that the display optical system has a more desirable optical performance. In the embodiment of the present invention, the chromatic aberration of the lens 40 is compensated by the correction element 70 having the chromatic dispersion characteristic opposite to that of the lens 40, so that the chromatic aberration can be effectively eliminated, thereby improving the image quality of the display optical system.
As an embodiment of the present invention, please continue to refer to fig. 1 to 2, the display optical system 100 for correcting chromatic aberration further includes a polarizer 20, a first polarization conversion element 30, a partially transmissive partially reflective element 90, a second polarization conversion element 50, and a polarization splitting element 60, which are sequentially disposed; wherein the lens 40 is disposed between the partially transmissive partially reflective element 90 and the second polarization converting element 50; the correcting element 70 is disposed between the lens 40 and the second polarization conversion element 50, or the correcting element 70 is disposed between the second polarization conversion element 50 and the polarization splitting element 60, or the correcting element 70 is disposed on a side of the polarization splitting element 60 facing away from the second polarization conversion element 50.
This embodiment is an application of the display optical system 100 for correcting chromatic aberration in a folded optical path.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a basic structure of a folded optical path (the direction indicated by an arrow in the figure is the direction of a main image optical path). The basic folded optical path structure includes a polarizer 20, a first polarization conversion element 30, a partially transmissive partially reflective element 90, a lens 40, a second polarization conversion element 50, and a polarization splitting element 60, which are sequentially disposed.
Among them, the polarizer 20 is preferably an absorption type polarizer such as a PVA (polyvinyl alcohol) polarizer commonly used in the display industry. The first polarization conversion element 30 is specifically a Quarter Wave Plate (QWP) capable of imparting a retardation of a quarter wavelength between fast and slow axis components to the incident polarized light, and typically, the azimuth angle of the optical axis of the quarter wave plate to the transmission axis of the polarizer is 40 ° to 50 °, and further 44 ° to 46 °. The partially transmissive and partially reflective element 90 may be disposed separately from the lens 40 or disposed in close contact with the lens 40, preferably, the partially transmissive and partially reflective element 90 is disposed in close contact with the lens 40, and the partially transmissive and partially reflective element 90 may be a light splitting film (usually a transflective film, i.e. 50% reflective and 50% transmissive) plated on the front surface (i.e. the surface facing the screen) of the lens 40. The lens 40 has a certain refractive power and may be a plano-convex lens 40, a biconvex lens 40 or a meniscus lens 40 with a positive focal length, and for better aberration control, the lens 40 is preferably biconvex, i.e. the surface of the lens 40 facing the first polarization conversion element 30 and the surface of the lens 40 facing the second polarization conversion element 50 are both convex. The partially transmissive and partially reflective element 90 may be separated from the lens 40, or may be attached to a surface of the lens 40 facing the screen, preferably a surface of the lens 40 facing the screen, and has a transmittance of 30% to 70%, more preferably 40% to 60%. The second polarization conversion element 50 is specifically a Quarter Wave Plate (QWP), and the material of the second polarization conversion element 50 may be the same as or different from that of the first polarization conversion element 30, and is preferably the same as that of the first polarization conversion element 30. The optical axis direction of the second polarization conversion element 50 is generally two, one is parallel to the first polarization conversion element 30, and the other is perpendicular to the first polarization conversion element 30. When the first scheme is adopted, the transmission axis of the polarization beam splitter 60 (PBS) is parallel to the polarizing member 20, and when the second scheme is adopted, the transmission axis of the polarization beam splitter 60 is perpendicular to the polarizing member 20. With this configuration, the polarization splitting element 60 can reflect the polarized light that is directly transmitted, thereby achieving the effect of folding the optical path. The polarization splitting element 60 may be a bragg-type reflective polarizer or a wire grid-type reflective polarizer.
In the above folded optical path structure, the main image optical path has the following specific direction: the light of the picture element on the display screen 10 is polarized into linear polarization by the polarizer 20, and then becomes circular polarization after passing through the first polarization conversion element 30, and then becomes linear polarization again after continuously passing through the second polarization conversion element 50, and at this time, the polarization direction is perpendicular to the transmission axis of the polarization splitting element 60, so that the light is reflected, the reflected light is reflected for the second time when reaching the partial transmission partial reflection element 90, and simultaneously, due to the half-wave loss caused by reflection, the chirality of the circular polarization is reversed, so that the polarization state of the light after passing through the second polarization conversion element 50 for the second time is orthogonal to the polarization state after passing through the second polarization conversion element 50 for the first time, and thus the light can be transmitted by the polarization splitting element 60, thereby forming a main image.
In the present embodiment, the correction element 70 is added to the basic folded optical path structure, and the chromatic aberration of the lens 40 is compensated by the correction element 70 having the opposite dispersion characteristic to that of the lens 40, so that the chromatic aberration can be effectively eliminated. The correction element 70 may be disposed at any position of the lens 40 in a direction away from the display screen 10, and preferably, the correction element 70 is disposed between the lens 40 and the polarization beam splitting element 60, so that the light may pass through the correction element 70 multiple times when being folded back, and the main image light path may achieve a more effective chromatic aberration correction effect.
It should be noted that the present invention does not limit the distance between any two elements of the display screen 10, the polarizer 20, the first polarization conversion element 30, the partially transmissive partially reflective element 90, the lens 40, and the polarization splitting element 60, and can be set according to actual needs.
In an alternative embodiment, referring to fig. 2, the curvature of the surface of the correcting element 70 facing the display screen 10 is the same as the curvature of the surface of the lens 40 facing away from the display screen 10, and every two adjacent elements of the lens 40, the second polarization conversion element 50, the polarization splitting element 60 and the correcting element 70 are attached to each other.
Since the correcting element 70 can be disposed at any position in the direction of the side of the lens 40 facing away from the display screen 10, that is, the positional relationship between the correcting element and the lens 40, the second polarization conversion element 50 and the polarization splitting element 60 can be adjusted according to actual needs. Specifically, the above structure includes three cases: the lens 40, the correcting element 70, the second polarization conversion element 50 and the polarization beam splitting element 60 are sequentially attached; alternatively, the lens 40, the second polarization conversion element 50, the correction element 70, and the polarization splitting element 60 are sequentially attached; alternatively, the lens 40, the second polarization conversion element 50, the polarization splitting element 60, and the correcting element 70 are laminated in this order.
Specifically, the second polarization conversion element 50 (for example, a quarter-wave plate) may be formed by crystal, polymer stretching, liquid crystal coating, and the like, and preferably has a film form such as polymer stretching and liquid crystal coating, so as to be conveniently attached to curved surfaces with different curvature radii. When the second polarization conversion element 50 is attached (directly or indirectly) to the surface of the lens 40, the second polarization conversion element 50 can be adapted to the shape of the lens 40. At the same time, the curvature of the surface of the correction element 70 facing the display screen 10 is the same as the curvature of the surface of the lens 40 facing away from the display screen 10, so that the correction element 70 may also be glued well (directly or indirectly) to the lens 40.
In this embodiment, the lens 40, the second polarization conversion element 50, the polarization beam splitter element 60, and the correction element 70 are disposed in a fitting manner (including three position sequences), so that no air is isolated between any two adjacent elements, and a ghost caused by fresnel reflection at a corresponding interface can be reduced, thereby improving the image quality of the display optical system.
Further, in the lens 40, the second polarization conversion element 50, the polarization splitting element 60, and the correcting element 70, optical glue is filled between every two adjacent elements.
The optical adhesive (adhesive for gluing optical parts) is a special adhesive for gluing transparent optical parts, and is required to be colorless and transparent, have the light transmittance of over 90 percent, have good gluing strength, be curable at room temperature or intermediate temperature, and have the characteristics of small curing shrinkage and the like. Adhesives such as silicone, acrylic, unsaturated polyester, polyurethane, epoxy and the like can be used to bond the optical parts. The optical adhesive is a high molecular substance which has optical performance similar to that of optical parts and has excellent adhesive bonding performance.
For example, the lens 40, the second polarization conversion element 50, the polarization beam splitter 60, and the corrector element 70 are sequentially attached to each other, and the optical adhesive may be selectively coated on the rear surface of the lens 40 (i.e., the surface facing the second polarization conversion element 50) or the front surface of the second polarization conversion element 50 (i.e., the surface facing the lens 40). The rear surface of the lens 40 may be a flat surface or a curved surface. When the rear surface of the lens 40 is a curved surface, the optical cement is preferably coated on the second polarization conversion element 50, because the second polarization conversion element 50 (such as a quarter-wave plate) is soft as a whole, the second polarization conversion element 50 can be in a planar state before the second polarization conversion element 50 is attached to the lens 40, and after the optical cement is coated on the front surface of the second polarization conversion element 50, the second polarization conversion element 50 is attached to the rear surface of the lens 40 and adapted to the convex shape of the lens 40, so that better uniformity and flatness can be achieved. Meanwhile, a bubble removing machine is required to perform vacuum bubble removing operation to prevent bubbles in the gap between the second polarization conversion element 50 and the lens 40 from scattering the imaging light when the second polarization conversion element and the lens are bonded. The gluing between the other adjacent elements is the same as the above method, and is not described in detail here.
The optical cement is preferably made of a refractive index matching material, and the matching means that the refractive index difference of substances on two sides of the interface is reduced, so that the loss of the reflected light is reduced to the minimum. Index matching is an important optical means, and aims to make the refractive index of a contact substance conform to a certain rule so as to reduce the reflection of light or increase the transmission of light. Interface reflection inside the optical system can be reduced by selecting the refractive index matching material, so that ghost is reduced, and imaging quality is improved.
Optionally, referring to fig. 3, the correcting element 70 is disposed between the lens 40 and the second polarization conversion element 50, or the correcting element 70 is disposed between the second polarization conversion element 50 and the polarization splitting element 60; the display optical system for correcting chromatic aberration further includes a protection element 80, and the protection element 80 is attached to a surface of the polarization beam splitter element 60 away from the display screen 10.
When the polarization splitting element 60 is located on the rear side of the correcting element 70 (i.e., the side facing away from the display screen 10), or the second polarization conversion element 50 and the polarization splitting element 60 are both located on the rear side of the correcting element 70, in order to protect the second polarization conversion element 50 and the polarization splitting element 60, a protective element 80 may be disposed on the rear surface of the polarization splitting element 60 (i.e., the surface facing away from the second polarization conversion element 50). Of course, because the protective element 80 has a relatively thin thickness and for cost reasons, the protective element 80 generally does not take on the role of aberration correction.
Optionally, referring to fig. 2, the correcting element 70 is disposed on a side of the polarization splitting element 60 away from the second polarization conversion element 50, and an antireflection film (not shown in the figure) is disposed on a surface of the correcting element 70 away from the polarization splitting element 60.
When the lens 40, the second polarization conversion element 50, the polarization beam splitter element 60, and the correction element 70 are sequentially disposed in a laminated manner (i.e., the correction element 70 is located behind the second polarization conversion element 50 and the polarization beam splitter element 60), the correction element can also protect the second polarization conversion element 50 and the polarization beam splitter element 60 in addition to the function of correcting chromatic aberration, so that an additional protection element 80 is not required, and material, cost, and space can be saved. The surface of the correcting element 70 exposed to the air (i.e. the surface facing away from the polarization splitting element 60) is coated with an antireflection film, so that ghost images caused by fresnel reflection of the corresponding interface can be reduced; the correcting element 70 is positioned between the second polarization conversion element 50 or the polarization splitting element 60, and the light rays pass through the correcting element 70 for multiple times when being folded back, so that the correcting effect is better. Therefore, the embodiment can improve the imaging quality of the optical display system.
In an alternative embodiment, referring to fig. 4, the correcting element 70 is disposed between the second polarization conversion element 50 and the polarization splitting element 60, the lens 40, the second polarization conversion element 50 and the correcting element 70 are sequentially disposed in an attached manner, an air gap is disposed between the polarization splitting element 60 and the correcting element 70, and an antireflection film (not shown) is disposed on a surface of the correcting element 70 facing the polarization splitting element 60.
In this embodiment, the polarization splitting element 60 and the correcting element 70 are not attached to each other. The size of the air space between the polarization beam splitter 60 and the lens 40 can be determined according to the optical design of the main image, so that the requirements of diopter adjustment and imaging image quality of the optical design can be met. The surface of the correcting element 70 exposed to the air (i.e., the surface facing the polarization splitting element 60) is coated with an antireflection film, so that ghost images caused by fresnel reflection of the corresponding interface can be reduced; the correcting element 70 is positioned between the second polarization conversion element 50 and the polarization splitting element 60, and the light rays can pass through the correcting element 70 for multiple times when being folded back, so that the correcting effect is better. Therefore, the embodiment can improve the imaging quality of the optical display system.
As an embodiment of the present invention, referring to fig. 5, the display optical system 100 for correcting chromatic aberration further includes a polarizer 20, a first polarization conversion element 30, a partially transmissive partially reflective element 90, a second polarization conversion element 50, and a polarization splitting element 60, which are sequentially disposed; wherein the lens 40 is disposed between the second polarization conversion element 50 and the polarization splitting element 60, the correcting element 70 is disposed between the partially transmissive partially reflective element 90 and the second polarization conversion element 50, the curvature of the surface of the correcting element 70 facing away from the display screen 10 is the same as the curvature of the surface of the lens 40 facing toward the display screen 10, and the correcting element 70, the second polarization conversion element 50 and the lens 40 are sequentially attached to each other.
The present embodiment is also an application of the display optical system 100 for correcting chromatic aberration in a folded optical path. However, unlike all of the above embodiments, the correcting element 70 in this embodiment is located between the display screen 10 and the lens 40 (i.e., the correcting element 70 is located on the front side of the lens 40). In order to ensure that the correcting element 70 can perform the function of correcting chromatic aberration, the partially transmissive and partially reflective element 90 needs to be moved forward from the front surface of the first polarization conversion element 30 to the front surface of the correcting element 70 (i.e., the surface facing the display screen 10). Meanwhile, the second polarization conversion element 50 is disposed in front of the first polarization conversion element 30 (i.e., facing the display screen 10), so that the calibration element 70 can protect the second polarization conversion element 50 without providing an additional element to protect the second polarization conversion element 50, thereby saving material, cost and space. Meanwhile, the correction element 70, the second polarization conversion element 50 and the lens 40 are sequentially attached, so that ghosting caused by fresnel reflection of corresponding interfaces can be reduced, and the image quality of the display optical system is improved.
In an embodiment of the present invention, the calibration element 70 is disposed on one side of the lens 40 facing the display screen 10, and the curvature of the surface of the calibration element 70 facing away from the display screen 10 is the same as the curvature of the surface of the lens 40 facing the display screen 10, the calibration element 70 is attached to the lens 40, and the surface of the calibration element 70 facing the display is provided with an antireflection film.
The present embodiment is an application of the display optical system 100 for correcting chromatic aberration in a direct-transmission optical path. In this embodiment, the correction element 70 is attached to the lens 40, so that the ghost caused by the fresnel reflection at the corresponding interface can be reduced, and the antireflection film is disposed on the front surface (i.e., the surface facing the display screen 10) of the correction element 70, so that the ghost can be further reduced. Therefore, the embodiment can reduce the corresponding ghost influence while correcting the chromatic aberration of the direct-transmission type optical path, so as to ensure the optical performance of the original direct-transmission type optical path.
The utility model also provides a correct display device that wears of chromatic aberration, this correct chromatic aberration wear display device include that the main part is worn to the head and the display optical system 100 who corrects the chromatic aberration, and the display optical system 100 who corrects the chromatic aberration is located in wearing the main part, and this correct chromatic aberration's display optical system 100's specific structure refers to above-mentioned embodiment, because this correct chromatic aberration wear display device has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, does not give unnecessary details here one by one again.
Wherein, wear the main part and can include the frame that is suitable for wearing at user's head, be used for adjusting the elasticity adjusting device of frame constraint degree to and be connected with the display optical system in order to carry out the control system etc. that controls display screen 10, wear the specific structure and the setting of main part and can adopt prior art, no longer describe here.
The above only be the preferred embodiment of the utility model discloses a not consequently restriction the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform of what the content was done in the description and the attached drawing, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A display optical system that corrects chromatic aberration, comprising:
a display screen;
the lens is arranged on one side of the display screen;
a correction element having the same curvature of a surface facing toward the display screen as the correction element has a curvature of a surface facing away from the display screen, and having opposite dispersion characteristics to the lens;
the correcting element is arranged on one side of the lens, which is deviated from the display screen, or the correcting element is arranged on one side of the lens, which faces the display screen.
2. The display optical system for correcting chromatic aberration of claim 1, further comprising a polarizing member, a first polarization conversion element, a partially transmissive partially reflective element, a second polarization conversion element, and a polarization splitting element, which are arranged in this order;
wherein the lens is disposed between the partially transmissive partially reflective element and the second polarization converting element; the correction element is arranged between the lens and the second polarization conversion element, or the correction element is arranged between the second polarization conversion element and the polarization splitting element, or the correction element is arranged on one side of the polarization splitting element, which is far away from the second polarization conversion element.
3. The display optical system for correcting chromatic aberration according to claim 2, wherein a curvature of a surface of the correcting element facing the display screen is the same as a curvature of a surface of the lens facing away from the display screen, and every adjacent two of the lens, the second polarization conversion element, the polarization splitting element, and the correcting element are disposed in conformity.
4. The display optical system for correcting chromatic aberration according to claim 3, wherein an optical paste is filled between every adjacent two of the lens, the second polarization conversion element, the polarization splitting element, and the correction element.
5. The display optical system for correcting chromatic aberration according to claim 3, wherein the correcting element is provided between the lens and the second polarization conversion element, or wherein the correcting element is provided between the second polarization conversion element and the polarization splitting element;
the display optical system for correcting chromatic aberration further comprises a protection element, and the protection element is attached to the surface, deviating from the display screen, of the polarization beam splitting element.
6. The display optical system for correcting chromatic aberration of claim 3, wherein the correcting element is provided on a side of the polarization splitting element facing away from the second polarization conversion element, and an antireflection film is provided on a surface of the correcting element facing away from the polarization splitting element.
7. The display optical system for correcting chromatic aberration according to claim 2, wherein the correcting element is disposed between the second polarization conversion element and the polarization splitting element, the lens, the second polarization conversion element, and the correcting element are sequentially attached to each other, an air gap is provided between the polarization splitting element and the correcting element, and an antireflection film is provided on a surface of the correcting element facing the polarization splitting element.
8. The display optical system for correcting chromatic aberration of claim 1, wherein the correcting element is disposed on a side of the lens facing the display screen, a curvature of a surface of the correcting element facing away from the display screen is the same as a curvature of a surface of the lens facing the display screen, the correcting element is attached to the lens, and an antireflection film is disposed on a surface of the correcting element facing the display screen.
9. The display optical system for correcting chromatic aberration of claim 1, further comprising a polarizing member, a first polarization conversion element, a partially transmissive partially reflective element, a second polarization conversion element, and a polarization splitting element, which are arranged in this order;
the lens is arranged between the second polarization conversion element and the polarization splitting element, the correcting element is arranged between the partial transmission partial reflection element and the second polarization conversion element, the curvature of the surface of the correcting element, which deviates from the display screen, is the same as the curvature of the surface of the display screen, which is faced by the lens, and the correcting element, the second polarization conversion element and the lens are sequentially attached.
10. A head-mounted display device that corrects chromatic aberration, comprising:
a head-mounted body; and
the chromatic-aberration-corrected display optical system of any one of claims 1 to 9, provided within the head-mounted body.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023076519A1 (en) * | 2021-11-01 | 2023-05-04 | Kokanee Research Llc | Lens module including two lens elements separated by an air gap |
| WO2023154234A1 (en) * | 2022-02-08 | 2023-08-17 | Meta Platforms Technologies, Llc | Lens assembly including path correction device |
| WO2023196531A1 (en) * | 2022-04-07 | 2023-10-12 | Meta Platforms Technologies, Llc | Reflective hollow singlet folded optical lens structure |
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2020
- 2020-10-26 CN CN202022413466.8U patent/CN213780542U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023076519A1 (en) * | 2021-11-01 | 2023-05-04 | Kokanee Research Llc | Lens module including two lens elements separated by an air gap |
| WO2023154234A1 (en) * | 2022-02-08 | 2023-08-17 | Meta Platforms Technologies, Llc | Lens assembly including path correction device |
| WO2023196531A1 (en) * | 2022-04-07 | 2023-10-12 | Meta Platforms Technologies, Llc | Reflective hollow singlet folded optical lens structure |
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