CN214310961U - Dispersion compensation structure and near-to-eye display device - Google Patents
Dispersion compensation structure and near-to-eye display device Download PDFInfo
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- CN214310961U CN214310961U CN202120348905.3U CN202120348905U CN214310961U CN 214310961 U CN214310961 U CN 214310961U CN 202120348905 U CN202120348905 U CN 202120348905U CN 214310961 U CN214310961 U CN 214310961U
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Abstract
The utility model discloses a dispersion compensation structure and near-to-eye display device, the dispersion compensation structure includes: the phase retarder comprises a phase retarder and a compensation film, wherein the compensation film is arranged on an incident light path or an emergent light path of the phase retarder; the compensation film comprises a first compensation film and/or a second compensation film, and has a first wavelength range and/or a second wavelength range in the wavelength band range of visible light, wherein the first wavelength range is different from the second wavelength range; in a first wavelength range, the actual phase retardation of the phase retardation plate is larger than the ideal retardation, and the first compensation film satisfies: the actual amount of phase retardation in the first wavelength range decreases with increasing wavelength; in a second wavelength range, the actual phase retardation of the phase retardation plate is smaller than the ideal retardation, and the second compensation film satisfies: the actual amount of phase retardation in the second wavelength range increases with increasing wavelength. The technical scheme of the utility model can reduce the color cast phenomenon and the stray light's that the display screen appears production.
Description
Technical Field
The utility model relates to an optical display technical field especially relates to a chromatic dispersion compensation structure and near-to-eye display device.
Background
In a Near eye display (Near eye display) device or a Head mounted display (Head mounted display) optical system, a polarizing element is generally used, and especially in a folded optical path, catadioptric control of light is performed by the polarizing element. However, the polarizer has severe dispersion, which causes a significant color shift when the color coordinates of the formed main image are compared with the screen, and on the other hand, the dispersion also causes the retardation of the commonly used phase retarder to deviate from the ideal state at most wavelengths, so that the user can see a color-shifted picture when using the polarizer.
SUMMERY OF THE UTILITY MODEL
Therefore, in order to solve the problem that the existing polarization element has severe dispersion and causes color cast of the viewed picture when the user uses the existing polarization element, it is necessary to provide a dispersion compensation structure and a near-eye display device, which aim to reduce the color cast phenomenon of the displayed picture and the generation of stray light.
To achieve the above object, the present invention provides a dispersion compensation structure, which comprises: the phase retarder comprises a phase retarder and a compensation film, wherein the compensation film is arranged on an incident light path or an emergent light path of the phase retarder; the compensation film comprises a first compensation film and/or a second compensation film, and has a first wavelength range and/or a second wavelength range in the wavelength band range of visible light, wherein the first wavelength range is different from the second wavelength range;
in the first wavelength range, the actual phase retardation amount of the phase retardation plate is larger than the ideal retardation amount thereof, and the first compensation film satisfies: the actual amount of phase retardation in the first wavelength range decreases with increasing wavelength;
in the second wavelength range, the actual phase retardation of the phase retardation plate is smaller than the ideal retardation, and the second compensation film satisfies the following conditions: the actual amount of phase retardation in the second wavelength range increases with increasing wavelength.
Optionally, the phase retarder comprises: a quarter-wave plate, the first wavelength range including blue wavelengths of visible light, the second wavelength range including red wavelengths of visible light, an in-plane phase retardation amount of the quarter-wave plate increasing with increasing wavelength, and an increase amount of the in-plane phase retardation amount deviating from an ideal retardation amount;
in the blue light wavelength range of visible light, the actual in-plane phase retardation of the phase retarder is larger than the ideal retardation;
in the red wavelength range of visible light, the actual in-plane phase retardation of the phase retarder is smaller than the ideal retardation;
the optical axis of the first compensation film is perpendicular to the optical axis of the phase retarder, and the optical axis of the second compensation film is parallel to the optical axis of the phase retarder.
Optionally, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the blue light wavelength range is Re, and the in-plane phase retardation of the first compensation film in the blue light wavelength range is R1Then, the following conditions are satisfied:
R1＝Re-Ri。
optionally, the first compensation film has a phase retardation within a red wavelength range of less than 5 nm.
Optionally, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the red light wavelength range is Re', and the phase retardation of the second compensation film in the red light wavelength range is R2Then, the following conditions are satisfied:
R2＝Ri-Re`。
optionally, the second compensation film has a phase retardation within a blue light wavelength range of less than 5 nm.
Optionally, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the blue light wavelength range is Re, and the first compensation film in the blue light wavelength range isWithin the range, the retardation of the phase is R1If the following conditions are met:
R1two first compensation films are provided, and the two first compensation films are sequentially arranged along the propagation direction of light.
Optionally, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the red light wavelength range is Re', and the phase retardation of the second compensation film in the red light wavelength range is R2If the following conditions are met:
R2two of the second compensation films are provided, and the two second compensation films are arranged along the propagation direction of the light and have parallel optical axes.
Optionally, the compensation film comprises a first compensation film and a second compensation film;
the first compensation film is arranged on the light-emitting surface of the phase retarder, and the second compensation film is arranged on one side, back to the phase retarder, of the first compensation film;
or the second compensation film is arranged on the light emergent surface of the phase retarder, and the first compensation film is arranged on one side of the second compensation film, which faces away from the phase retarder.
Furthermore, in order to achieve the above object, the present invention also provides a near-eye display device comprising a catadioptric optical path comprising a plurality of optical elements and a dispersion compensation structure as described above, the dispersion compensation structure being disposed between the plurality of optical elements, light of the near-eye display device being catadioptric between the dispersion compensation structure and the plurality of optical elements.
The utility model provides an among the technical scheme, the ideal in-plane phase delay volume is along with the increase of wavelength and increases to in-plane phase delay volume and wavelength relation are fixed. In a common phase retarder, the increase of the in-plane phase retardation is different from the increase of the ideal in-plane phase retardation in the visible light range. The in-plane phase retardation of the first wavelength range phase plate increases by a magnitude higher than an ideal in-plane phase retardation, and the in-plane phase retardation of the second wavelength range phase plate increases by a magnitude lower than the ideal in-plane phase retardation. By providing a compensation film in the incident light path or the outgoing light path of the phase retarder, the compensation film has a characteristic that the phase retardation amount decreases with increasing wavelength in the first wavelength range, thereby making the in-plane phase retardation amount approach to the ideal in-plane phase retardation amount in the first wavelength range. Alternatively, in the second wavelength range, the in-plane phase retardation increases with increasing wavelength, so that the in-plane phase retardation in the second wavelength range approaches the ideal in-plane phase retardation. Therefore, the dispersion compensation structure is added in the optical path, so that the in-plane phase retardation approaches to the ideal in-plane phase retardation in the corresponding wavelength range, the corresponding wavelength light is normally displayed, and the color cast phenomenon and the generation of stray light are reduced.
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 structural diagram of a dispersion compensation structure according to the present invention;
FIG. 2 is a schematic diagram of the effect of using a first compensation film of a dispersion compensation structure;
FIG. 3 is a schematic diagram of the effect of using a second compensation film of a dispersion compensation structure;
fig. 4 is a schematic diagram of the effects of the first compensation film and the second compensation film using the dispersion compensation structure.
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 all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention 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 indicator is changed accordingly.
In addition, descriptions in the present application as to "first", "second", and the like are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to 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 the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present application, unless expressly stated or limited otherwise, the terms "connected" and "fixed" are to be construed broadly, e.g., "fixed" may be fixedly connected or detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
In addition, the technical solutions between the embodiments of the present invention can be combined with each other, but it is necessary to be able to be realized by a person having ordinary skill in the art as a basis, and when the technical solutions are contradictory or cannot be realized, the combination of such technical solutions should be considered to be absent, and is not within the protection scope of the present invention.
In a Near eye display (Near eye display) device or a Head mounted display (Head mounted display) optical system, a polarizing element is generally used, and especially in a folded optical path, catadioptric control of light is performed by the polarizing element. However, the polarizer has severe dispersion, which causes a significant color shift when the color coordinates of the formed main image are compared with the screen, and on the other hand, the dispersion also causes the retardation amount of the commonly used phase retarder to deviate from the ideal state at most wavelengths, so that the user can see a color-shifted picture when using the polarizer.
In order to solve the above problem, referring to fig. 1, the present invention provides a dispersion compensation structure, which includes: the phase retarder comprises a phase retarder and a compensation film, the polarization state of light can be changed after the light passes through the phase retarder, the compensation film is arranged on an incident light path or an emergent light path of the phase retarder, and the dispersion of a visible light spectrum is compensated through the compensation film.
The in-plane phase retardation of the phase retarder increases as the wavelength increases, and the amount of the in-plane phase retardation increases with deviation from the ideal retardation, and this phase retarder is called an anomalous phase retarder. The in-plane phase retardation Re can be made to have a characteristic related to the magnitude of wavelength in the entire visible light spectrum by the anomalous phase retardation plate. The retardation characteristics of the retardation plate are caused by the difference in refractive indices nx, ny, nz in the three directions x, y, z, and the retardation amount can be further divided into an in-plane retardation amount Re and a thickness direction retardation amount Rth. The ideal retardation of the retarder should increase with increasing wavelength and be fixed in magnitude with respect to the wavelength. For example, as the wavelength increases.
The compensation film is arranged on the light emergent surface of the phase retarder and comprises a first compensation film and/or a second compensation film. It can be seen that the specific film design of the compensation film has three cases. The first case is: the compensation film includes a first compensation film by which the in-plane phase retardation amount decreases with an increase in wavelength in the first wavelength range, thereby causing the in-plane phase retardation amount to approach an ideal in-plane phase retardation amount in the first wavelength range. The second case is: the compensation film includes a second compensation film by which the in-plane phase retardation increases with increasing wavelength in the second wavelength range, so that the in-plane phase retardation approaches the ideal in-plane phase retardation in the second wavelength range. The third case is: the compensation film includes a first compensation film and a second compensation film, and compensates for an in-plane phase retardation in both the first wavelength range and the second wavelength range.
Referring to fig. 2 to 4, the abscissa is the wavelength, and the ordinate is the ratio of the in-plane phase retardations in the opposite plane, which is the ratio of the in-plane phase retardation in the visible wavelength range to the in-plane phase retardation at the 550nm position. As can be seen from fig. 2, the ideal in-plane phase retardation is a straight line of a fixed slope, and the in-plane phase retardation of the anomalous phase retardation plate is higher than the ideal in-plane phase retardation in the first wavelength range and lower than the ideal in-plane phase retardation in the second wavelength range. After the first compensation film is provided, the in-plane phase retardation of the anomalous phase retardation plate approaches the ideal in-plane phase retardation in the first wavelength range. After the second compensation film is provided, the in-plane phase retardation of the anomalous phase retardation plate approaches the ideal in-plane phase retardation in the second wavelength range. In the case where the first compensation film and the second compensation film are combined, it can be seen that the in-plane phase retardation amounts in both the first wavelength range and the second wavelength range approach the ideal in-plane phase retardation amount.
In the technical solution proposed in this embodiment, ideally, the in-plane retardation increases with increasing wavelength, and the relationship between the in-plane retardation and the wavelength is fixed, and the wavelength determines the ideal retardation of the retardation plate, that is, the ideal retardation of the retardation plate is determined by the wavelength. In a common phase retarder, the increase of the in-plane phase retardation is different from the increase of the ideal in-plane phase retardation in the visible light range. The in-plane phase retardation of the first wavelength range phase plate increases by a magnitude higher than an ideal in-plane phase retardation, and the in-plane phase retardation of the second wavelength range phase plate increases by a magnitude lower than the ideal in-plane phase retardation. The compensation film is provided on the phase retarder, and the compensation film has a characteristic that the phase retardation amount decreases with increasing wavelength in the first wavelength range, thereby making the in-plane phase retardation amount approach to the ideal in-plane phase retardation amount in the first wavelength range. Alternatively, in the second wavelength range, the in-plane phase retardation increases with increasing wavelength, so that the in-plane phase retardation in the second wavelength range approaches the ideal in-plane phase retardation. Therefore, the dispersion compensation structure is added in the optical path, so that the in-plane phase retardation approaches to the ideal in-plane phase retardation in the corresponding wavelength range, the corresponding wavelength light is normally displayed, and the color cast phenomenon and the generation of stray light are reduced.
In addition, the compensation film can have an anti-reflection effect, and when the compensation film is arranged on the surface of the phase delay sheet opposite to air, the transmittance of light can be improved. Moreover, the compensation film has a surface hardening effect, and when the compensation film is arranged on the surface of the phase retarder opposite to air, the surface of the phase retarder can be protected.
In the above-described embodiments of the present application, the phase retarder includes: a quarter wave plate (qwp), the second wavelength range including red wavelengths of visible light, and the first wavelength range including blue wavelengths of visible light. The ideal in-plane phase retardation of the quarter-wave plate should increase as the wavelength increases and the in-plane phase retardation always equals one quarter of the wavelength, that is, the increase in the phase retardation in the face of is fixed in relation to the corresponding wavelength. The dispersion characteristics of quarter-wave plates are mainly classified into three categories: the first type is normal dispersion, exemplified by conventional PC (polycarbonate), which is characterized in that the in-plane retardation decreases as the wavelength increases, mainly because the difference in refractive index in the long wavelength band is smaller than that in the short wavelength band in the resin material; the second type is uniform retardation, which is characterized by a retardation amount that is almost constant as the wavelength increases; the third type is anomalous dispersion, exemplified by modified PC, which is characterized by an increase in retardation with increasing wavelength. In this embodiment, the in-plane phase retardation of the quarter-wave plate increases with increasing wavelength, and the relationship between the increase in the phase retardation and the corresponding wavelength is not fixed. The quarter-wave plate in this embodiment is an anomalous quarter-wave plate. The quarter-wave plate can be a single-layer film or a composite film formed by compounding two or more layers of phase delay films, for example, a broadband quarter-wave plate formed by compounding a half-wave plate and a quarter-wave plate at a certain angle, and the optical axis of the composite quarter-wave plate is an equivalent optical axis;
specifically, in the blue wavelength range of visible light, the actual in-plane phase retardation of the anomalous quarter-wave plate is greater than its ideal retardation; in the red wavelength range of visible light, the actual in-plane phase retardation of the abnormal quarter-wave plate is smaller than the ideal retardation; the optical axis of the first compensation film is vertical to the optical axis of the abnormal quarter-wave plate, and the optical axis of the second compensation film is parallel to the optical axis of the abnormal quarter-wave plate.
Specifically, in the yellow-green light range (500nm to 590nm), the in-plane phase retardation amount conforms to the in-plane phase retardation amount characteristic of the ideal quarter-wave plate, but the in-plane phase retardation amount of the abnormal quarter-wave plate is generally higher in the blue light wavelength range than in the ideal quarter-wave plate, and the in-plane phase retardation amount of the abnormal quarter-wave plate is generally lower in the red light wavelength range than in the ideal quarter-wave plate. The blue light wavelength range is 400 nm-480 nm, and the red light wavelength range is 620 nm-760 nm. The first compensation film may reduce an increase in an in-plane phase retardation through the abnormal quarter-wave plate in a wavelength range of 400nm to 480nm, and the second compensation film may increase an increase in an in-plane phase retardation through the abnormal quarter-wave plate in a wavelength range of 620nm to 760 nm.
In one embodiment of the present application, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the retardation film in the blue light wavelength range is Re, and the in-plane phase retardation of the first compensation film in the blue light wavelength range is R1Then, the following conditions are satisfied: r1Re-Ri. The increase of the in-plane retardation Re by the anomalous phase retardation plate is high in the blue wavelength regionThe in-plane retardation of the ideal standard is Ri, that is, Re is greater than Ri, and R is the in-plane retardation of the first compensation film in the blue wavelength range for calculation to be accurate1And performing difference processing on Re and Ri.
In an embodiment of the present application, the phase retardation of the first compensation film in the red wavelength range is less than 5 nm. The first compensation film can generate the effect of reducing the increase range of the in-plane phase retardation of polarized light passing through the abnormal phase retarder in the whole blue-green light spectrum range, and in order to reduce the phase retardation in the red light wavelength range from the standard in-plane phase retardation, the phase retardation in the red light wavelength range of the first compensation film is controlled to be less than 5nm, and further controlled to be less than 2 nm.
In one embodiment of the present application, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the red wavelength range is Re', and the phase retardation of the second compensation film in the red wavelength range is R2Then, the following conditions are satisfied: r2Ri-Re'. The magnitude of increase of the in-plane phase retardation Re 'by the anomalous phase retardation plate is low in the red wavelength region, Ri is the in-plane phase retardation lower than the ideal standard, that is, Re' is smaller than Ri, and R is the phase retardation in the red wavelength region for the purpose of calculating the correct second compensation film2And performing difference processing on Ri and Re'.
In an embodiment of the present application, the second compensation film has a retardation of less than 5nm in a blue wavelength range. The second compensation film can generate the effect of improving the increase range of the in-plane phase retardation of polarized light passing through the abnormal phase retarder in the whole red and green light range, and in order to reduce the phase retardation in the blue light wavelength range from the standard in-plane phase retardation by a larger range, the phase retardation in the blue light wavelength range of the second compensation film is controlled to be less than 5nm, and further controlled to be less than 2 nm.
In an embodiment of the present application, the phase retardation in the standard plane of the dispersion compensation structure is Ri, and the phase retardation plate is in a blue light waveThe in-plane retardation in the long range is Re, and the in-plane retardation in the blue wavelength range of the first compensation film is R1If the following conditions are met:
R1two first compensation films are provided, the two first compensation films being disposed along the propagation direction of the light and having parallel optical axes. That is, the first compensation film may be a single layer film or a double layer film. In the case of a double layer film, the in-plane retardation is R1Half the difference between Re and Ri. The number of the specific film layers is mainly determined according to the magnitude of the in-plane phase retardation.
In an embodiment of the present application, the standard in-plane phase retardation of the dispersion compensation structure is Ri, the in-plane phase retardation of the phase retarder in the red wavelength range is Re', and the phase retardation of the second compensation film in the red wavelength range is R2If the following conditions are met:
R2two second compensation films are provided, and the two second compensation films are arranged along the propagation direction of the light and have parallel optical axes. That is, the second compensation film may be a single layer film or a double layer film. In the case of a double layer film, the in-plane retardation is R2Half the difference between Ri and Re'. The number of the specific film layers is mainly determined according to the magnitude of the in-plane phase retardation.
In an embodiment of the present application, the compensation film includes a first compensation film and a second compensation film; the first compensation film is arranged on the light-emitting surface of the phase delay piece, and the second compensation film is arranged on one side of the first compensation film, which faces away from the phase delay piece. The light passing through the anomalous phase retardation plate passes through the first compensation film and then the second compensation film.
Or the second compensation film is arranged on the light emergent surface of the phase delay piece, and the first compensation film is arranged on one side of the second compensation film, which faces away from the phase delay piece. The light passing through the anomalous phase retardation plate passes through the second compensation film and then the first compensation film. Therefore, the position between the first compensation film and the second compensation film can be set arbitrarily, and the dispersion compensation structure has greater flexibility in manufacturing.
The invention also provides near-eye display equipment which comprises a catadioptric optical path, wherein the catadioptric optical path comprises a plurality of optical elements and the dispersion compensation structure, the dispersion compensation structure is arranged among the optical elements, and light rays of the near-eye display equipment are catadioptric between the dispersion compensation structure and the optical elements.
In this embodiment, the volume of the near-to-eye display device can be reduced by the catadioptric optical path, and the in-plane phase retardation approaches to the ideal in-plane phase retardation in the corresponding wavelength range by the dispersion compensation structure, so that the corresponding wavelength light is normally displayed, and the color cast phenomenon and the generation of stray light are reduced.
For a specific implementation of the near-eye display device, reference may be made to an embodiment of a dispersion compensation structure, which is not described herein again.
The above is only the preferred embodiment of the present invention, not so limiting the patent scope of the present invention, all of which are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of the specification and the attached drawings did, or directly/indirectly use all to include in other relevant technical fields the patent protection scope of the present invention.
Claims (10)
1. A dispersion compensation structure, comprising: the phase retarder comprises a phase retarder and a compensation film, wherein the compensation film is arranged on an incident light path or an emergent light path of the phase retarder; the compensation film comprises a first compensation film and/or a second compensation film, and has a first wavelength range and/or a second wavelength range in the wavelength band range of visible light, wherein the first wavelength range is different from the second wavelength range;
in the first wavelength range, the actual phase retardation amount of the phase retardation plate is larger than the ideal retardation amount thereof, and the first compensation film satisfies: the actual amount of phase retardation in the first wavelength range decreases with increasing wavelength;
in the second wavelength range, the actual phase retardation of the phase retardation plate is smaller than the ideal retardation, and the second compensation film satisfies the following conditions: the actual amount of phase retardation in the second wavelength range increases with increasing wavelength.
2. The dispersion compensation structure of claim 1, wherein said phase retardation film comprises: a quarter-wave plate, the first wavelength range including blue wavelengths of visible light, the second wavelength range including red wavelengths of visible light, an in-plane phase retardation amount of the quarter-wave plate increasing with increasing wavelength, and an increase amount of the in-plane phase retardation amount deviating from an ideal retardation amount;
in the blue light wavelength range of visible light, the actual in-plane phase retardation of the phase retarder is larger than the ideal retardation;
in the red wavelength range of visible light, the actual in-plane phase retardation of the phase retarder is smaller than the ideal retardation;
the optical axis of the first compensation film is perpendicular to the optical axis of the phase retarder, and the optical axis of the second compensation film is parallel to the optical axis of the phase retarder.
3. The dispersion compensating structure of claim 2, wherein the dispersion compensating structure has a standard in-plane phase retardation of Ri, the phase retarder has an in-plane phase retardation of Re in the blue light wavelength range, and the first compensation film has an in-plane phase retardation of R in the blue light wavelength range1Then, the following conditions are satisfied:
R1＝Re-Ri。
4. the dispersion compensating structure of claim 3, wherein the first compensation film has a phase retardation of less than 5nm in a red wavelength range.
5. The dispersion compensating structure of claim 2, wherein the standard in-plane phase retardation of the dispersion compensating structure is Ri, the in-plane phase retardation of the phase retarder in the red wavelength range is Re', and the phase retardation of the second compensation film in the red wavelength range is R2Then, the following conditions are satisfied:
R2＝Ri-Re`。
6. the dispersion compensating structure of claim 5, wherein the second compensation film has a phase retardation of less than 5nm in a blue light wavelength range.
7. The dispersion compensating structure of claim 2, wherein the dispersion compensating structure has a standard in-plane phase retardation of Ri, the phase retarder has an in-plane phase retardation of Re in the blue light wavelength range, and the first compensation film has an in-plane phase retardation of R in the blue light wavelength range1If the following conditions are met:
R1two first compensation films are arranged along the propagation direction of the light and the optical axes are parallel to each other.
8. The dispersion compensating structure of claim 2, wherein the standard in-plane phase retardation of the dispersion compensating structure is Ri, the in-plane phase retardation of the phase retarder in the red wavelength range is Re', and the phase retardation of the second compensation film in the red wavelength range is R2If the following conditions are met:
R2two of the second compensation films are arranged along the propagation direction of the light and the optical axes of the two second compensation films are parallel to each other (Ri-Re')/2.
9. A dispersion compensating structure as claimed in any one of claims 1 to 8, in which the compensation film comprises a first compensation film and a second compensation film;
the first compensation film is arranged on the light-emitting surface of the phase retarder, and the second compensation film is arranged on one side, back to the phase retarder, of the first compensation film;
or the second compensation film is arranged on the light emergent surface of the phase retarder, and the first compensation film is arranged on one side of the second compensation film, which faces away from the phase retarder.
10. A near-eye display device comprising a catadioptric optical path comprising a plurality of optical elements and a dispersion compensating structure as claimed in any one of claims 1 to 9, the dispersion compensating structure being disposed between the plurality of optical elements, light of the near-eye display device being catadioptric between the dispersion compensating structure and the plurality of optical elements.
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