CN218122368U - Optical display module and near-to-eye display equipment - Google Patents
Optical display module and near-to-eye display equipment Download PDFInfo
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- CN218122368U CN218122368U CN202222607553.6U CN202222607553U CN218122368U CN 218122368 U CN218122368 U CN 218122368U CN 202222607553 U CN202222607553 U CN 202222607553U CN 218122368 U CN218122368 U CN 218122368U
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Abstract
The utility model provides an optical display module, include: a first polarizer configured to receive signal light and modulate the signal light into a first linearly polarized light; a phase compensation unit disposed downstream of the first polarizer in an optical path, and configured to receive the first linearly polarized light and perform phase compensation; the reflective polarizer is arranged on the downstream of the optical path of the phase compensation unit, is configured to receive the first linear polarized light after phase compensation and reflect the first linear polarized light to an observation end, and is also configured to receive ambient light and transmit the ambient light to the observation end; wherein the reflective polarizer has a curved surface shape and is curved toward the observation end. The utility model discloses improve on the birdbath basic structure, reduce the light leak that polarizing element produced under the large visual angle to reinforcing strabismus ability, in order to provide even display capability on each visual angle.
Description
Technical Field
The present disclosure relates to the field of optical display technologies, and in particular, to an optical display module and a near-to-eye display device.
Background
The Augmented Reality technology (AR) is to provide virtual information for a user through technologies such as images, videos, 3D models and the like while displaying a real scene, to realize the smart mutual fusion of the virtual information and a real world, and to provide a sense beyond Reality for the user. Currently, among numerous AR optical solutions, the birdbath solution receives a lot of attention due to its low cost, compact structure, good optical effect, and the like. In the birdbath scheme, the display output image is manipulated by a polarizing element in the optical path, and is input to the human eye superimposed with external ambient light. The polarizing elements are designed for axial light, so that light leakage does not occur only in the axial direction when an image is transmitted, but severe light leakage occurs in the axial direction, particularly at a large viewing angle, so that the display capability at each viewing angle is not uniform (the oblique viewing capability is smaller than the front viewing capability).
Fig. 1 shows a schematic diagram of a conventional birdbath structure, in which no light leakage occurs in an axial light path, that is, axial signal light is totally reflected when being incident on a reflective polarizer, and light leakage occurs when a large-angle signal light is incident on the reflective polarizer, such as light leakage 1 in fig. 1, and the light leakage causes an oblique viewing capability smaller than an elevation viewing capability.
The statements in this background section merely disclose technology known to the inventors and do not, of course, represent prior art in the art.
SUMMERY OF THE UTILITY MODEL
In view of one or more existing defects, the utility model provides an optical display module assembly, include:
a first polarizer configured to receive signal light and modulate the signal light into a first linearly polarized light;
a phase compensation unit disposed downstream of the first polarizer in an optical path, and configured to receive the first linearly polarized light and perform phase compensation;
the reflective polarizer is arranged on the downstream of the optical path of the phase compensation unit, is configured to receive the first linear polarized light after phase compensation and reflect the first linear polarized light to an observation end, and is also configured to receive ambient light and transmit the ambient light to the observation end;
wherein the reflective polarizer has a curved surface shape and is curved toward the observation end.
According to the utility model discloses an aspect, optical display module assembly still includes:
and the lens unit is arranged between the phase compensation unit and the reflective polaroid and is configured to amplify, zoom and project the first linear polarization after phase compensation to the reflective polaroid.
According to an aspect of the present invention, wherein the optical axis of the phase compensation unit is located in a plane orthogonal to the transmission axis of the first polarizing plate or a plane orthogonal to the absorption axis of the first polarizing plate.
According to an aspect of the present invention, wherein the phase compensation unit is disposed adjacent to and in parallel with the first polarizer.
According to the utility model discloses an aspect, the optical display module assembly still includes:
and a lens unit disposed between the first polarizer and the phase compensation unit, and configured to magnify and zoom the first linearly polarized light and project the magnified light to the phase compensation unit.
According to an aspect of the present invention, wherein the optical axis of the phase compensation unit is located in a plane orthogonal to the transmission axis of the reflective polarizer or a plane orthogonal to the reflection axis of the reflective polarizer.
According to an aspect of the present invention, wherein the phase compensation unit is adjacent to the reflective polarizer and has a substantially same curved surface profile as the reflective polarizer.
According to an aspect of the present invention, an angle between an axial direction of the reflective polarizer and an axial direction of the first polarizer is between 30 degrees and 60 degrees.
According to an aspect of the present invention, wherein an axial direction of the reflective polarizer and an axial direction angle of the first polarizer are 45 degrees.
The utility model discloses still relate to a near-to-eye display device, include:
a display screen; and
the optical display module is arranged on the downstream of the optical path of the display screen.
The utility model discloses improve on the birdbath infrastructure, reduce the light leak that polarizing element produced under the large visual angle to reinforcing strabismus ability does not have the influence to axial light when eliminating or reducing the light leak of non-axial light, thereby provides even display capability on each visual angle.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and are not to limit the disclosure. In the drawings:
FIG. 1 shows a light leakage diagram of a conventional birdbath structure;
fig. 2 a-2 b are schematic structural diagrams of optical display modules according to various embodiments of the present invention;
fig. 3 is a schematic diagram of an optical display module according to an embodiment of the present invention.
Detailed Description
In the following, only certain exemplary embodiments are briefly described. As those skilled in the art would realize, the described embodiments may be modified in various different ways, all without departing from the spirit or scope of the present invention. Accordingly, the drawings and description are to be regarded as illustrative in nature, and not as restrictive.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and to simplify the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically limited otherwise.
In the description of the present invention, it should be noted that unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection, either mechanically, electrically, or in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. 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 the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. The first feature being "under," "beneath," and "under" the second feature includes the first feature being directly above and obliquely above the second feature, or simply meaning that the first feature is at a lesser level than the second feature.
The following disclosure provides many different embodiments or examples for implementing different features of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present disclosure may repeat reference numerals and/or reference letters in the various examples for purposes of simplicity and clarity and do not in itself dictate a relationship between the various embodiments and/or arrangements discussed. In addition, the present disclosure provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or use of other materials.
The utility model discloses improve on the birdbath infrastructure, reduce the light leak that polarizing element produced under big visual angle to reinforcing strabismus ability, in order to provide even display capability on each visual angle.
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are presented herein only to illustrate and explain the present invention, and not to limit the present invention.
Fig. 2a shows a schematic structural diagram of an optical display module according to an embodiment of the present invention, the optical display module includes a first polarizer 1, a phase compensation unit 2 and a reflective polarizer 3, as follows:
the first polarizer 1 is configured to receive signal light and modulate the signal light into first linearly polarized light.
And a phase compensation unit 2 disposed downstream of the first polarizer 1 in the optical path, and configured to receive the first linearly polarized light and perform phase compensation.
And the reflective polarizer 3 is arranged on the optical path downstream of the phase compensation unit 2, is configured to receive the first linear polarization light after phase compensation and reflect the first linear polarization light to an observation end, and is also configured to receive ambient light and transmit the ambient light to the observation end.
Wherein, the reflective polarizer 3 has a curved surface type and is bent toward the observation end.
With continued reference to fig. 2a, the signal light is an axial light when propagating along the light path 81, and the signal light is a large-angle non-axial light when propagating along the light path 91. The signal light propagating along the optical path 81 is converted into the first linearly polarized light, enters the reflective polarizer 3, and is totally reflected to the observation end. If not adopt the utility model discloses a scheme, incident to reflective polaroid 3 after the signal light that follows light path 91 propagation converts first line polarisation into, and partial reflection is to the observation end, and partial transmission forms light leak 1. It can be seen that light leakage occurs when non-axial signal light is transmitted, and the light leakage is more serious the larger the viewing angle is. If adopt the utility model discloses a scheme, the signal light of following light path 91 propagation converts incident to reflective polaroid 3 behind the first line of polarisation into, and is whole or almost all reflected to the observation end to effectively eliminate or reduce the light leak 1, strengthen the squint ability, and provide even display capability on each visual angle. No matter adopt the utility model discloses a scheme, the axial signal light that follows light path 81 and propagate all can not take place the light leak.
In signal light transmission, the first polarizer 1 receives image signal light emitted from a display panel (not shown), converts it into first line polarized light and transmits it, and the phase compensation unit 2 receives the first line polarized light and compensates its phase so that light passing therethrough and reaching the reflective polarizer 3 for the first time is totally reflected.
When ambient light is transmitted, axial light propagating along optical path 82 and non-axial light propagating along optical path 92 are transmitted through reflective polarizer 3 to the viewing end.
According to the utility model discloses a preferred embodiment, optical display module assembly still includes:
and a lens unit 4 disposed between the phase compensation unit 2 and the reflective polarizer 3, and configured to magnify and zoom the phase-compensated first linearly polarized light and project the magnified first linearly polarized light onto the reflective polarizer 3.
With continued reference to fig. 2a, the first polarizer 1 receives image signal light emitted from a display screen (not shown), converts the image signal light into first line polarized light and transmits the first line polarized light, the phase compensation unit 2 receives the first line polarized light, compensates the phase of the first line polarized light, the first line polarized light after phase compensation enters the lens unit 4, the first line polarized light after phase compensation enters the reflective polarizer 3 after amplification and zooming, all or almost all of the first line polarized light is reflected to a viewing end, and light leakage 1 is effectively eliminated or reduced.
Fig. 3 shows a schematic diagram of an optical path of an optical display module according to an embodiment of the present invention, and in conjunction with fig. 2a, the optical display module includes a first polarizer 1, a phase compensation unit 2, a reflective polarizer 3, and a lens unit 4. The first polarizer 1 is used for receiving image signal light A1 emitted by a display screen (not shown) and generating first linear polarization light A2; the first linear polarized light A2 is changed into first linear polarized light A3 through the phase compensation unit 2, and is changed into first linear polarized light A4 through the lens unit 4, the first linear polarized light A4 is totally reflected when being incident to the reflective polarizer 3, and reflected light A5 enters human eyes; ambient light B1 is transmitted through the reflective polarizer 3 and B2 enters the human eye. Utilize optical element's semi-transparent semi-reflection characteristic, when optical display module reflects part signal light to people's eye, external environment light also can pass optical display module, when the show real scene, can also provide virtual information for the person of wearing to realize the integration of real world scene and virtual image, provide beyond reality's visual sensation for the person of wearing.
According to a preferred embodiment of the present invention, wherein the optical axis of the phase compensation unit 2 is located in a plane orthogonal to the transmission axis of the first polarizer 1 or a plane orthogonal to the absorption axis of the first polarizer 1.
According to the utility model discloses a preferred embodiment, wherein phase compensation unit 2 with first polaroid 1 is adjacent and parallel arrangement to maximize utilizes space, compact structure.
With continued reference to fig. 2a, the first polarizer 1, the phase compensation unit 2, and the lens unit 4 are sequentially disposed along the optical path 81, so as to realize the functions of conversion, phase compensation, and zoom magnification of the image signal light, and have a compact structure and are suitable for wearing.
According to another preferred embodiment of the present invention, the optical display module further comprises:
and a lens unit 4 disposed between the first polarizing plate 1 and the phase compensation unit 2, and configured to magnify and zoom the first linearly polarized light and project the magnified first linearly polarized light to the phase compensation unit 2.
Fig. 2b is a schematic structural diagram of an optical display module according to another embodiment of the present invention, which is different from the embodiment of fig. 2a in that: in the embodiment of fig. 2a, the phase compensation unit 2 is arranged between the first polarizer 1 and the lens unit 4, and in the embodiment of fig. 2b, the phase compensation unit 2 is arranged between the lens unit 4 and the reflective polarizer 3.
With continued reference to fig. 2b, the first polarizing plate 1, the lens unit 4, and the phase compensation unit 2 are disposed in this order along the optical path 81, thereby achieving the effects of conversion, magnification zoom, and phase compensation of the image signal light. When the first linear polarized light after phase compensation reaches the reflective polarizer 3 for the first time, all or almost all of the first linear polarized light is reflected to the observation end, so that the light leakage 1 is effectively eliminated or reduced.
According to another preferred embodiment of the present invention, with continued reference to fig. 2b, the optical axis of the phase compensation unit 2 is located in a plane orthogonal to the transmission axis of the reflective polarizer 3 or to the reflection axis of the reflective polarizer 3.
According to another preferred embodiment of the present invention, with continued reference to fig. 2b, the phase compensation unit 2 is adjacent to the reflective polarizer 3 and has a curved surface shape substantially the same as the reflective polarizer 3, so as to maximize the use of space and achieve a compact structure.
According to another preferred embodiment of the present invention, reference is made to fig. 2a and 2b, wherein the angle between the axial direction of the reflective polarizer 3 and the axial direction of the first polarizer 1 is between 30 and 60 degrees. Preferably, the angle between the axial direction of the reflective polarizer 3 and the axial direction of the first polarizer 1 is 45 degrees, so as to realize a more compact and wearable structure.
Preferably, the phase compensation unit 2 comprises one or more phase compensation film diaphragms selected from a positive a film, a negative a film, a positive B film, a negative B film, a positive C film, a negative C film and a Z film.
The phase compensation unit 2 may include a single positive a film (nz = ny < nx), a negative a film (nz = ny > nx), a positive C film (nz > nx = ny), a negative C film (nz < nx = ny), a positive B film (nz < ny < nx), a negative B film (nz > nx > ny), a Z film (nx > nz > ny), and other types of phase compensation film patches, or a combination of a plurality of these patches. Wherein nx, ny and nz are refractive indexes of the film in a three-dimensional coordinate system respectively.
To sum up, to present birdbath structure, the utility model discloses increase the phase compensation unit at polaroid low reaches and reflection-type polaroid upper reaches, can effectively eliminate or reduce the light leak in the signal light path to reinforcing strabismus ability does not have the influence to axial light when eliminating or reducing the light leak of non-axial light, thereby provides even display capability in each visual angle.
The utility model discloses still relate to a near-to-eye display device, include:
a display screen; and
the optical display module is arranged on the downstream of the optical path of the display screen.
The utility model discloses a near-to-eye display device is based on the design of birdbath to improve on birdbath infrastructure, reduce the light leak that polarizing element produced under the big visual angle, thereby strengthen the strabismus ability, do not have the influence to axial light when eliminating or reducing the light leak of non-axial light, thereby provide even display capability on each visual angle.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for elements thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. An optical display module comprising:
a first polarizer configured to receive the signal light and modulate the signal light into a first linearly polarized light;
a phase compensation unit disposed downstream of the first polarizer in an optical path, and configured to receive the first linearly polarized light and perform phase compensation;
the reflective polarizer is arranged on the downstream of the optical path of the phase compensation unit, is configured to receive the first linear polarized light after phase compensation and reflect the first linear polarized light to an observation end, and is also configured to receive ambient light and transmit the ambient light to the observation end;
wherein the reflective polarizer has a curved surface shape and is curved toward the observation end.
2. The optical display module of claim 1, further comprising:
and the lens unit is arranged between the phase compensation unit and the reflective polaroid and is configured to amplify, zoom and project the first linear polarization after phase compensation to the reflective polaroid.
3. The optical display module of claim 2, wherein the optical axis of the phase compensation unit is in a plane orthogonal to the transmission axis of the first polarizer or in a plane orthogonal to the absorption axis of the first polarizer.
4. The optical display module of claim 2, wherein the phase compensation unit is disposed adjacent and parallel to the first polarizer.
5. The optical display module of claim 1, further comprising:
and a lens unit disposed between the first polarizer and the phase compensation unit, and configured to magnify and zoom the first linearly polarized light and project the magnified light to the phase compensation unit.
6. The optical display module of claim 5, wherein the optical axis of the phase compensation unit is in a plane orthogonal to the transmission axis of the reflective polarizer or in a plane orthogonal to the reflection axis of the reflective polarizer.
7. The optical display module of claim 5, wherein the phase compensation unit is adjacent to the reflective polarizer and has substantially the same profile as the reflective polarizer.
8. The optical display module of any of claims 1-7, wherein the axial direction of the reflective polarizer is angled between 30 and 60 degrees from the axial direction of the first polarizer.
9. The optical display module of claim 8, wherein the axial direction of the reflective polarizer is at an angle of 45 degrees to the axial direction of the first polarizer.
10. A near-eye display device comprising:
a display screen; and
the optical display module of any one of claims 1-9 disposed in the optical path downstream of the display screen.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222607553.6U CN218122368U (en) | 2022-09-30 | 2022-09-30 | Optical display module and near-to-eye display equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222607553.6U CN218122368U (en) | 2022-09-30 | 2022-09-30 | Optical display module and near-to-eye display equipment |
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| CN218122368U true CN218122368U (en) | 2022-12-23 |
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| CN202222607553.6U Active CN218122368U (en) | 2022-09-30 | 2022-09-30 | Optical display module and near-to-eye display equipment |
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