CN115437153A - Near-to-eye display optical system and VR display equipment - Google Patents

Abstract

The invention provides a near-to-eye display optical system, which comprises a shell, a display device and a light ray processing module, wherein the shell is provided with a light source and a light source; the light processing module is positioned between the display device and the eye end; the light ray processing module comprises a lens group and a polarization absorption module; the lens group includes: the light-transmitting module comprises a first lens and a polarization reflecting film arranged on the mirror surface of the first lens; the semi-transparent module is used for transmitting part of linearly polarized light to the polarization absorption module; the polarization absorbing module includes: the first wave plate is used for changing the polarization form of linearly polarized light; a polarized absorbing film arranged on the side of the first wave plate near the eye end to eliminate ghost images; and allows light having a polarization direction parallel to the transmission axis of the polarization absorbing film to pass through the polarization absorbing film. The processing of light is realized, ghost image phenomenon is eliminated, the volume of an optical system is reduced, stray light phenomenon is improved, and VR viewing experience of users is improved. The invention also provides a VR display device including the near-eye display optical system.

Description

Near-to-eye display optical system and VR display equipment

Technical Field

The invention relates to the technical field of optical systems, in particular to a near-eye display optical system and VR display equipment.

Background

An optical system (optical system) is a system in which a plurality of optical elements such as a lens, a mirror, a prism, and a diaphragm are combined in a certain order.

Virtual Reality (VR) display technology is coming to its fast inflation phase, and in the in-process of playing games, watching the movie, the consumer needs a picture quality clear, needs the near-to-eye display device that small, light in weight, wears comfortablely, can wear for a long time simultaneously. Its optical system of more VR equipment in the existing market is mostly fresnel formula or many lens refraction formula, and optical system thickness is great, and the complete machine is bulky, seriously influences and wears the use for a long time. Moreover, the chromatic aberration and stray light of the Fresnel lens are serious, and the experience feeling is poor.

In the prior art, in a catadioptric near-to-eye display optical system, a polarization reflective film and a wave plate are placed on one side close to eyes of a user, a semi-reflective and semi-transparent film is arranged on one side close to a screen, and partial non-imaging light rays emitted by the screen and reflected by the semi-reflective and semi-transparent film may irradiate the frame position of the screen, so that stray light of the screen is caused.

Disclosure of Invention

In order to overcome the technical defects, the present invention provides a near-eye display optical system and a VR display device, which achieve processing of light, eliminate ghost image, reduce the volume of the optical system, improve stray light, and improve VR viewing experience of users.

The invention discloses a near-to-eye display optical system, which comprises a shell, a display device and a light processing module, wherein the display device and the light processing module are fixed in the shell;

the display device is used for emitting initial light to the eye end outside the shell;

the ray processing module is positioned between the display device and the eye end and used for processing the initial ray to generate a virtual image;

the light ray processing module comprises a lens group and a polarization absorption module, the lens group is positioned between the polarization absorption module and the display device, and the lens group and the polarization absorption module are arranged at intervals;

the lens group includes:

the light transmitting module is arranged on one side close to the display device and comprises a first lens and a polarization reflecting film arranged on the mirror surface of the first lens, and the light transmitting module is used for converting the initial light into linearly polarized light and emitting the linearly polarized light, and enabling the emitting direction of the linearly polarized light to be parallel to the transmission axis of the polarization reflecting film;

the semi-transparent module is positioned between the polarization absorption module and the light-transmitting module and is used for transmitting part of the linearly polarized light to the polarization absorption module;

the polarization absorbing module includes:

the first wave plate is used for changing the polarization form of linearly polarized light;

the polarized absorption film is arranged on the side surface of the first wave plate close to the eye end and is used for absorbing light with the polarization direction vertical to the transmission axis of the polarized absorption film so as to eliminate ghost images; and allowing light having a polarization direction parallel to a transmission axis of the polarizing absorption film to pass through the polarizing absorption film to form a constituent beam of the virtual image.

Preferably, the first lens is disposed on a side close to the display device, and the polarizing reflective film is disposed on a side of the first lens away from the display device.

Preferably, the semi-transparent module comprises a semi-reflective and semi-transparent film, and the semi-reflective and semi-transparent film is arranged at intervals or attached to the first lens.

Preferably, the semi-transparent module further includes a second lens, the second lens is spaced from the first lens, the second lens is located on a side of the first lens away from the display device, and the side of the second lens is provided with the semi-reflective and semi-transparent film.

Preferably, the polarization absorption module further comprises a plate glass, and the plate glass is attached to the first wave plate.

Preferably, the lens group further includes a second lens, a second wave plate and a third wave plate, the first lens is close to one side of the display device and is attached to the second wave plate, the second wave plate is close to one side of the display device and is attached to the third wave plate, and the polarization reflection film is sandwiched between the second wave plate and the third wave plate.

Preferably, the transflective film is disposed on a side surface of the second lens, and one side of the second lens, which is close to the eye end, is attached to the first wave plate.

Preferably, the lens group further comprises a third lens, the third lens being positioned on the side of the first lens near the eye end;

the first lens, the second lens and the third lens are all provided with light transmission spaces between every two, the third lens or the side of the second lens is provided with a semi-reflecting and semi-transparent film, and the second lens is located between the third lens and the first lens.

The invention also provides VR display equipment comprising the near-eye display optical system.

After the technical scheme is adopted, compared with the prior art, the invention has the following beneficial effects:

1. the light processing module is positioned between the display device and the eye end and used for processing the initial light to generate a virtual image, and the light processing module comprises a lens group and a polarization absorption module, so that the light is transmitted and processed, the structure is simple, and the occupied volume is small;

2. absorbing light with a polarization direction perpendicular to a transmission axis of the polarization absorption film through the polarization absorption film to eliminate ghost images; and allowing light having a polarization direction parallel to a transmission axis of the polarizing absorption film to pass through the polarizing absorption film to form a constituent beam of the virtual image. Ghost image phenomenon is eliminated, interference caused by stray light to a display picture is prevented, stray light phenomenon is avoided, the display picture is improved, and VR watching experience of a user is improved.

Drawings

Fig. 1 is a schematic structural diagram of a near-eye display optical system according to a first embodiment of the present invention;

fig. 2 is a schematic end view of a first lens element according to a first embodiment of the present invention;

fig. 3 is a schematic structural diagram of a polarization absorption module according to a first embodiment of the present invention;

fig. 4 is a schematic structural diagram of a near-eye display optical system according to a second embodiment of the present invention;

fig. 5 is a schematic structural diagram of a near-eye display optical system according to a third embodiment of the present invention;

fig. 6 is a schematic structural diagram of a near-eye display optical system according to a fourth embodiment of the present invention;

fig. 7 is a schematic structural diagram of a near-eye display optical system according to a fifth embodiment of the present invention;

fig. 8 is a schematic structural diagram of a near-eye display optical system according to a sixth embodiment of the present invention;

fig. 9 is a schematic end view of a first lens according to a sixth embodiment of the present invention;

fig. 10 is a schematic structural diagram of a near-eye display optical system according to a seventh embodiment of the present invention.

Reference numerals: 1-a display device; 2-a lens group; 3-a polarization absorbing module;

21-a first lens; 22-a second lens; 23-a third lens; 24-a polarizing reflective film; 25-a semi-reflecting and semi-permeable membrane; 26-a second wave plate; 27-a third wave plate;

31-a first waveplate; 32-polarizing absorption film; 33-plate glass.

Detailed Description

The advantages of the invention are further illustrated in the following description of specific embodiments in conjunction with the accompanying drawings.

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

The terminology used in the disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. As used in this disclosure and the appended claims, the singular forms "a near-eye display optical system and VR display device", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure. The word "if," as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030when" or "in response to a determination," depending on the context.

In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

In the description of the present invention, unless otherwise specified and limited, it should be noted that the terms "mounted," "connected," and "connected" are to be interpreted broadly, and may be, for example, a mechanical connection or an electrical connection, a communication between two elements, a direct connection, or an indirect connection through an intermediate medium, and those skilled in the art will understand the specific meaning of the terms as they are used in the specific case.

In the following description, suffixes such as "module", "component", or "unit" used to denote elements are used only for facilitating the explanation of the present invention, and have no specific meaning in themselves. Thus, "module" and "component" may be used in a mixture.

Example one

The invention discloses a near-to-eye display optical system, which comprises a shell, a display device 1 and a light processing module, wherein the display device 1 and the light processing module are fixed in the shell;

the display device 1 is used for emitting initial light to an eye end outside the shell; in some embodiments, the wavelength of the initial light emitted by the display device 1 is in the range of 400nm to 1000nm.

In some embodiments, the Display device 1 includes, but is not limited to, any one of a Micro light emitting diode Display (Micro-LED), a Mini light emitting diode Display (Mini LED), an Organic light emitting semiconductor Display (OLED), an Organic light emitting semiconductor Display (Micro-OLED), or a Liquid Crystal Display (LCD).

The ray processing module is positioned between the display device 1 and the eye end and is used for processing the initial ray to generate a virtual image;

the light processing module comprises a lens group 2 and a polarization absorption module 3, the lens group 2 is positioned between the polarization absorption module 3 and the display device 1, and the lens group 2 and the polarization absorption module 3 are arranged at intervals;

the lens group 2 includes:

the light transmitting module is arranged on one side close to the display device 1 and comprises a first lens 21 and a polarization reflection film 24 arranged on the mirror surface of the first lens 21, and the light transmitting module is used for converting the initial light into linearly polarized light and emitting the linearly polarized light, and enabling the emitting direction of the linearly polarized light to be parallel to the transmission axis of the polarization reflection film 24;

the semi-transparent module is positioned between the polarization absorption module 3 and the light-transmitting module and is used for transmitting part of the linearly polarized light to the polarization absorption module 3;

the polarization absorption module 3 includes:

a first wave plate 31 for changing the polarization form of linearly polarized light;

a polarized absorbing film 32, disposed on the side of the first wave plate 31 near the eye end, for absorbing light whose polarization direction is perpendicular to the transmission axis of the polarized absorbing film 32 to eliminate ghost images; and allows light having a polarization direction parallel to the transmission axis of the polarization absorbing film 32 to pass through the polarization absorbing film 32 to form a constituent beam of the virtual image.

As an alternative embodiment of the present invention, the first lens 21 is disposed on a side close to the display device 1, and the polarizing reflective film 24 is disposed on a side of the first lens 21 away from the display device 1.

As an alternative embodiment of the present invention, the semi-transparent module includes a semi-reflective and semi-transparent film 25, and the semi-reflective and semi-transparent film 25 is disposed at an interval or attached to the first lens 21.

In some embodiments, the Display device 1 includes a Display screen including, but not limited to, any one of a Micro light emitting diode Display (Micro-LED), a Mini light emitting diode Display (Mini LED), an Organic light emitting semiconductor Display (OLED), an Organic light emitting semiconductor Display (Micro-OLED) or a Liquid Crystal Display (LCD);

the polarization reflection film 24 and the wave plate are attached to the side surface of one of the lenses in the lens group 2 close to the display screen or attached to the display screen. The semi-reflecting and semi-transmitting film 25 is plated on the side surface of one of the lenses close to the eye end through a film plating process, and the semi-reflecting and semi-transmitting film 25 is not arranged between the attached surface of the polarized reflecting film 24 and the screen. The above-described arrangement can also realize the function of the near-eye display optical system of the present invention.

In some embodiments, referring to fig. 1, the transflective film 25 is disposed at an interval with the first lens 21, the transflective module further includes a second lens 22, the second lens 22 is disposed at an interval with the first lens 21, the second lens 22 is located on a side of the first lens 21 away from the display device 1, and the transflective film 25 is disposed on a side of the second lens 22. The transflective film 25 is positioned on the second lens 22 on a side thereof adjacent to the eye end.

In some embodiments, referring to fig. 1 and fig. 2, the lens assembly 2 further includes a second lens 22, a second wave plate 26, and a third wave plate 27, wherein a side of the first lens 21 close to the display device 1 is attached to the second wave plate 26, a side of the second wave plate 26 close to the display device 1 is attached to the third wave plate 27, and the polarization reflection film 24 is sandwiched between the second wave plate 26 and the third wave plate 27.

In some embodiments, the second lens 22 is attached to the second wave plate 26, the polarization reflective film 24, and the third wave plate 27 in sequence along a direction close to the display device 1 toward the side of the display device 1, and the polarization reflective film 24 is located between the second wave plate 26 and the third wave plate 27.

In some embodiments, the transflective film 25 is plated on the side of the second wave plate 26 or the third wave plate 27 by a plating process.

In some embodiments, referring to fig. 1 and 3, the polarization absorption module 3 further includes a flat glass 33, the first glass is attached to the flat glass 33, and the polarization absorption film 32 is plated on a connection surface of the first wave plate 31 and the flat glass 33.

In some embodiments, the first wave plate 31 is a quarter wave plate, and the quarter wave plate functions as: when light with a certain wavelength vertically enters and passes through the quarter-wave plate, the phase difference between emergent ordinary light and emergent extraordinary light is 1/4 wavelength;

the plate glass 33 is provided so that the polarization absorbing film 32 and the quarter wave plate are attached to the plate glass 33. In other embodiments, the flat glass 33 may be eliminated and the quarter wave plate and polarizing absorption film 32 attached directly to the lens surface closest to the eye end may achieve the same light absorbing effect. The surface of the lens closest to the eye end is a plane or spherical surface, and if spherical, its radius of curvature is R, with the radius of curvature being taken over a range of values | R | >10.

In some embodiments, the lens surface types of the lenses in the lens group 2 of the present invention, such as the first lens 21, the second lens 22, and the third lens 23, include, but are not limited to, any one of a spherical surface, a quadratic surface, a fresnel surface, an aspherical surface, and a free-form surface.

The working principle of the near-eye display optical system is as follows:

the arrow in the figure indicates the propagation direction of light, the initial light emitted by the micro-display or the display screen is set to be circularly polarized light carrying image information, after the initial light passes through the third wave plate 27, the third wave plate 27 converts the circularly polarized light into linearly polarized light, the polarization state of the linearly polarized light is p-state, and the polarization direction at this time is set to be the reference direction;

it can be stated that both reflection and transmission characteristics are polarization dependent when light penetrates the surface of an optical element, such as a wave plate, at non-perpendicular angles. In this case, the coordinate system used is defined by the plane containing the input and reflected beams. If the polarization vector of the light is in this plane, or parallel to the plane of incidence, it is referred to as p-polarized light; if the polarization vector is perpendicular to this plane, it is referred to as s-polarized light.

After the polarized light passes through the polarization reflection film 24, the polarization reflection film 24 reflects s-polarized light perpendicular to the incident plane; the p-polarized light parallel to the incident plane passes through the polarization reflection film 24, the transmission axis of the polarization reflection film 24 is parallel to the vibration direction of the p-polarized light, the p-polarized light completely passes through the polarization reflection film 24, the light passing through the polarization reflection film 24 passes through the second wave plate 26, the second wave plate 26 converts the light into circularly polarized light, and then the light sequentially passes through the first lens 21 and the second lens 22;

after passing through the second lens 22, the light passes through the semi-reflective and semi-transparent film 25, under the action of the semi-reflective and semi-transparent film 25, 50% of the light passing through the second lens 22 passes through the semi-reflective and semi-transparent film 25, and the other 50% of the light is reflected by the semi-reflective and semi-transparent film 25, so that the first folding of the light path is realized; the light passing through the transflective film 25 is subjected to the following step (1), and the light reflected by the transflective film 25 is subjected to the following step (2).

(1) After the light passing through the semi-reflecting and semi-transparent film 25 passes through the first wave plate 31 attached to the glass flat plate, the first wave plate 31 converts circularly polarized light into linearly polarized light, the polarization direction of the linearly polarized light is rotated by 90 degrees relative to the reference direction, namely the polarization state of the linearly polarized light is converted into an s state, the linearly polarized light in the s state is absorbed by the polarization absorption film 32 attached to the surface, close to the eye end, of the flat glass 33 after passing through the flat glass 33, ghost images are eliminated, and the ghost images cannot interfere with imaging pictures;

(2) The light reflected by the semi-reflecting and semi-transmitting film 25 sequentially passes through the first lens 21 and the second wave plate 26, the circularly polarized light is converted into linearly polarized light under the action of the second wave plate 26, the polarization direction of the linearly polarized light rotates 90 degrees relative to the reference direction, the polarization state of the linearly polarized light is converted into the s state, the light transmission axis of the polarization reflecting film 24 is perpendicular to the vibration direction of the s polarized light at the moment, the part of the light passing through the second wave plate 26 is reflected by the polarization reflecting film 24 to realize the second folding of the light path, then the light passes through the second wave plate 26 again, and the second wave plate 26 converts the s-state linearly polarized light into circularly polarized light;

then the light rays sequentially pass through the first lens 21 and the second lens 22, after the light rays pass through the semi-reflective and semi-transparent film 25, 50% of the light rays passing through the semi-reflective and semi-transparent film 25 pass through the semi-reflective and semi-transparent film 25, the other 50% of the light rays are reflected by the semi-reflective and semi-transparent film 25, and the reflected light rays do not enter an imaging light path any more. The light passing through the half-reflecting and half-transmitting film 25 continues to pass through the first wave plate 31 attached to the rear surface of the plate glass 33, the first wave plate 31 converts circularly polarized light into linearly polarized light, the polarization state of the light is p-state at the moment and is parallel to the incident plane, namely the polarization direction of the light at the moment can pass through the polarization absorption film 32, so that the light is received by the eye end, namely the light enters human eyes;

and after the light ray bundle sent by each pixel point on the screen passes through the light path, the virtual image intersection point position of each light ray bundle forms a virtual image at a position in front of the eyes at a certain distance, so that the optical effect of virtual reality is realized.

If the light emitted by the screen is linearly polarized light, and the polarization state is p-state, the functions of the near-eye display optical system can be realized only by adjusting the direction of the transmission axis of the polarization reflection film 24 to be consistent with the polarization direction of the screen polarized light, and the specific working process and principle thereof are not described herein again.

In the first embodiment, if the light emitted from the display device 1 is circularly polarized light, the third wave plate 27 needs to be added to convert the circularly polarized light into linearly polarized light, and the direction of the polarization reflection film 24 is adjusted to make the transmission axis parallel to the polarization direction of the linearly polarized light.

In the second embodiment, the light emitted from the display device 1 is linearly polarized, and the third wave plate 27 is not required to modulate the polarization state of the light.

In the third embodiment, the display device 1 is a self-luminous screen such as an OLED, and the emitted light is natural light, and a polarizing plate needs to be additionally added to convert the light into polarized light.

Example two

The near-eye display optical system of the second embodiment comprises a shell, a display device and a light processing module, wherein the display device and the light processing module are fixed in the shell; referring to fig. 4, the light processing module includes a lens group 2 and a polarization absorption module 3, the lens group 2 is located between the polarization absorption module 3 and the display device 1, and the lens group 2 and the polarization absorption module 3 are arranged at an interval; the lens group 2 includes: the light-transmitting module is arranged at one side close to the display device 1; and the semi-transparent module is positioned between the polarization absorption module 3 and the light-transmitting module.

The second embodiment is the same as the first embodiment in the structure of the polarization absorption module 3, and each polarization absorption module 3 includes a plate glass 33, a first wave plate 31, and a polarization absorption film 32 disposed between the plate glass 33 and the first wave plate 31.

The difference from the first embodiment is that:

referring to fig. 4, the lens assembly 2 of the second embodiment has only one lens, the second wave plate 26, the polarization reflective film 24 and the third wave plate 27 are sequentially attached to the first lens 21 on the side close to the display device 1 and facing the direction close to the display device 1, the polarization reflective film 24 is disposed between the second wave plate 26 and the third wave plate 27, and the transflective film 25 is further disposed on the side close to the eye end of the first lens 21.

EXAMPLE III

The near-to-eye display optical system of the third embodiment includes a housing, and a display device and a light processing module fixed in the housing, referring to fig. 5, the light processing module includes a lens group 2 and a polarization absorption module 3, the lens group 2 includes a transparent module and a semi-transparent module, the transparent module includes a first lens 21 and a polarization reflective film 24 disposed on a mirror surface of the first lens 21, and the polarization absorption module 3 includes a flat glass 33, a first wave plate 31 and a polarization absorption film 32. The relationship between the above structures and the function of the structures are similar or identical to the structure and function of the first embodiment.

The difference from the embodiment is that:

referring to fig. 5, the lens group 2 according to the third embodiment includes three lenses spaced apart from each other, that is, the lens group 2 further includes a third lens 23, and the third lens 23 is located on a side of the first lens 21 close to the eye end;

a light transmission space is arranged between each two of the first lens 21, the second lens 22 and the third lens 23, and the second lens 22 is positioned between the third lens 23 and the first lens 21;

namely, the lens group 2 includes a first lens 21, a second lens 22, and a third lens 23;

a first lens 21 is arranged at one end close to the display device 1, and a second wave plate 26, a polarization reflection film 24 and a third wave plate 27 are sequentially attached to the side surface of the first lens 21 close to the display device 1;

a third lens 23 is arranged at one end close to the eye end, and a semi-reflecting and semi-permeable membrane 25 is arranged at one side of the third lens 23 close to the eye end;

the second lens 22 is disposed between the first lens 21 and the third lens 23.

Example four

The structural composition of the near-eye display optical system of the fourth embodiment is the same as that of the near-eye display optical system of the third embodiment.

The difference from the third embodiment lies in:

referring to fig. 6, in the fourth embodiment, the first lens 21 is disposed at one end close to the display device 1, and the second wave plate 26, the polarization reflective film 24 and the third wave plate 27 are sequentially attached to the side surface of the first lens 21 close to the display device 1;

a third lens 23 is provided at the end near the eye end;

a second lens 22 is arranged between the first lens 21 and the third lens 23, and a transflective film 25 is arranged on the side of the second lens 22 close to the eye end.

EXAMPLE five

The structure composition of the near-eye display optical system of the fifth embodiment is the same as that of the near-eye display optical system of the third embodiment, and is different from that of the third embodiment in that:

referring to fig. 7, in the fifth embodiment, a third lens 23 is arranged at one end close to the eye end, and a semi-reflecting and semi-transparent film 25 is arranged at one end of the third lens 23 close to the eye end;

a second lens 22 is provided at an end close to the display device 1;

the first lens 21 is disposed between the second lens 22 and the third lens 23, the first lens 21, the second lens 22, and the third lens 23 are spaced apart from each other, and the second wave plate 26, the polarizing reflective film 24, and the third wave plate 27 are sequentially attached to the first lens 21 near the side surface of the display device 1.

Example six

The near-eye display optical system according to the sixth embodiment has the same structure as the near-eye display optical system according to the first embodiment, and referring to fig. 8, the structures of the polarization absorption modules 3 according to the sixth embodiment and the first embodiment are the same, and each of the polarization absorption modules 3 includes a plate glass 33, a first wave plate 31, and a polarization absorption film 32 disposed between the plate glass 33 and the first wave plate 31.

The difference from the first embodiment is that:

referring to fig. 8 and 9, the lens group 2 includes a first lens 21 and a second lens 22;

sequentially attaching a third wave plate 27, a polarization absorption film 32 and a second wave plate 26 to the light emitting surface of the display device 1, wherein the third wave plate 27 is attached to the light emitting surface of the display device 1, the second wave plate 26 is attached to one side of the third wave plate 27 close to the eye end, and the polarization absorption film 32 is arranged between the second wave plate 26 and the third wave plate 27;

the first lens 21 and the second lens 22 are both located between the second wave plate 26 and the first wave plate 31, the first lens 21 is close to the first wave plate 31, the second lens 22 is close to the second wave plate 26, and the first wave plate 31, the first lens 21, the second lens 22 and the second wave plate 26 are sequentially arranged in an isolated manner.

The side of the first wave plate 31 near the eye end is provided with a semi-reflecting and semi-permeable membrane 25.

In the fifth embodiment, the third wave plate 27, the polarization absorption film 32 and the second wave plate 26 sequentially attached to the light emitting surface of the display device 1 can be disposed on one adhesive film, so that the adhesive film efficiency can be effectively improved, stray light caused by the interference light irradiating the screen frame can be avoided, and the image quality can be improved.

In specific application, when light emitted by the display screen is circularly polarized light, and the second wave plate 26, the polarization reflection film 24 and the third wave plate 27 are attached to the rear surface of the lens on one side close to the display screen, the third wave plate 27, the polarization reflection film 24 and the second wave plate 26 can also be attached to the screen in sequence, and the film attaching process on the screen is simpler and more convenient in process. The pressure of the lens film pasting process is reduced.

When the light emitted from the screen is linearly polarized light, the second wave plate 26 and the polarization reflection film 24 may be directly attached to the screen in this order without attaching the third wave plate 27.

EXAMPLE seven

The near-to-eye display optical system of the seventh embodiment comprises a housing, and a display device and a light processing module which are fixed in the housing; referring to fig. 10, the light processing module includes a lens group 2 and a polarization absorption module 3, the lens group 2 is located between the polarization absorption module 3 and the display device 1, and the lens group 2 and the polarization absorption module 3 are disposed at an interval;

the lens group 2 includes: the light-transmitting module is arranged at one side close to the display device 1; the semi-transparent module is positioned between the polarization absorption module 3 and the light-transmitting module;

the polarization absorbing module 3 includes: a first wave plate 31; and the polarized absorption film 32 is arranged on the side surface of the first wave plate 31 close to the eye end.

The seventh embodiment is the same as the first embodiment in terms of structural composition, i.e., relationship between structures, and functions of structures, and is different from the first embodiment in that:

the seventh embodiment omits the plate glass, and the specific structure is as follows:

referring to fig. 10, the lens group includes a first lens 21 disposed near one end of the display device 1 and a second lens 22 near an eye end, one side of the first lens 21 near the eye end is sequentially attached with a second wave plate 26, a polarized reflective film 24 and a third wave plate 27 along a direction near the display device 1, and a half-reflecting half-transmitting film 25 is disposed on a side of the first lens 21 facing the eye end;

the side of the second lens 22 close to the eye end is sequentially attached with a first wave plate 31 and a polarization absorption film 32 along the direction close to the eye end, and the polarization absorption film 32 is arranged on the side of the first wave plate 31 close to the eye end.

The invention also provides VR display equipment comprising the near-eye display optical system.

In summary, the near-eye display optical system and the VR display device of the present invention have the following advantages:

1. the monocular field angle exceeding 90 degrees can fully improve the immersion feeling of a customer when using VR equipment, and the size is small, the wearing comfort is high and is only about one third of that of a traditional Fresnel type VR optical system;

2. the light processing module is positioned between the display device and the eye end and used for processing the initial light to generate a virtual image, and the light processing module comprises a lens group and a polarization absorption module, so that the light is transmitted and processed, the structure is simple, and the occupied volume is small;

3. absorbing light with a polarization direction perpendicular to a transmission axis of the polarization absorption film through the polarization absorption film to eliminate ghost images; and allowing light having a polarization direction parallel to a transmission axis of the polarization absorption film to pass through the polarization absorption film to form a constituent beam of the virtual image. Ghost image phenomenon is eliminated, interference of stray light on a display picture is prevented, stray light phenomenon is avoided, the display picture is improved, and VR watching experience of a user is improved.

3. The polarized reflecting film and the wave plate are attached to the near screen side surface of one lens in the lens group or attached to the screen. The half-reflecting half-transmitting film is also arranged on the near-eye surface of one lens, and the surface is not arranged between the surface of the polarized reflecting film and the screen. The interference light is prevented from irradiating the screen frame to cause stray light, the image quality is improved, the installation space is saved, the film is convenient to stick, and the near-to-eye display optical system is convenient to install and maintain.

It should be noted that the embodiments of the present invention have been described with reference to the accompanying drawings, and it is not intended to limit the invention to the specific embodiments, but rather, the invention is to cover all modifications, equivalents and alternatives falling within the scope of the invention.

Claims (9)

1. A near-to-eye display optical system is characterized by comprising a shell, a display device and a light processing module, wherein the display device and the light processing module are fixed in the shell;

the display device is used for emitting initial light to the eye end outside the shell;

the light processing module is positioned between the display device and the eye end and used for processing the initial light to generate a virtual image;

the light ray processing module comprises a lens group and a polarization absorption module, the lens group is positioned between the polarization absorption module and the display device, and the lens group and the polarization absorption module are arranged at intervals;

the lens group includes:

the light transmitting module is arranged on one side close to the display device and comprises a first lens and a polarization reflecting film arranged on the mirror surface of the first lens, and the light transmitting module is used for converting the initial light into linearly polarized light and emitting the linearly polarized light, and enabling the emitting direction of the linearly polarized light to be parallel to the transmission axis of the polarization reflecting film;

the semi-transparent module is positioned between the polarization absorption module and the light-transmitting module and is used for transmitting part of the linearly polarized light to the polarization absorption module;

the polarization absorbing module includes:

the first wave plate is used for changing the polarization form of linearly polarized light;

the polarized absorption film is arranged on the side surface of the first wave plate close to the eye end and is used for absorbing light with the polarization direction vertical to the transmission axis of the polarized absorption film so as to eliminate ghost images; and allowing light having a polarization direction parallel to a transmission axis of the polarization absorption film to pass through the polarization absorption film to form a constituent beam of the virtual image.

2. The near-eye display optical system according to claim 1, wherein the first lens is disposed on a side close to the display device, and the polarizing reflective film is disposed on a side of the first lens away from the display device.

3. The near-eye display optical system of claim 1, wherein the semi-transparent module comprises a semi-reflective and semi-transparent film, and the semi-reflective and semi-transparent film is spaced apart from or attached to the first lens.

4. The near-eye display optical system of claim 3, wherein the semi-transparent module further comprises a second lens, the second lens is spaced apart from the first lens, the second lens is located on a side of the first lens away from the display device, and the semi-reflective and semi-transparent film is disposed on a side of the second lens.

5. The near-eye display optical system of claim 1, wherein the polarization absorbing module further comprises a plate glass, the plate glass being attached to the first wave plate.

6. The near-eye display optical system of claim 3, wherein the lens assembly further comprises a second lens, a second wave plate and a third wave plate, wherein the second wave plate is attached to a side of the first lens close to the display device, the third wave plate is attached to a side of the second wave plate close to the display device, and the polarization reflection film is sandwiched between the second wave plate and the third wave plate.

7. The near-eye display optical system of claim 6, wherein the transflective film is disposed on a side surface of the second lens, and a side of the second lens close to the eye end is attached to the first wave plate.

8. The near-eye display optical system of claim 4, wherein the lens group further comprises a third lens positioned on a side of the first lens closer to an eye's eye end;

the first lens, the second lens and the third lens are all provided with light transmission spaces between every two, the third lens or the side of the second lens is provided with a semi-reflecting and semi-transparent film, and the second lens is located between the third lens and the first lens.

9. A VR display device comprising the near-eye display optical system of any one of claims 1 to 8.

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