CN120143453A - Display device and head mounted display device - Google Patents
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- CN120143453A CN120143453A CN202311696458.0A CN202311696458A CN120143453A CN 120143453 A CN120143453 A CN 120143453A CN 202311696458 A CN202311696458 A CN 202311696458A CN 120143453 A CN120143453 A CN 120143453A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0132—Head-up displays characterised by optical features comprising binocular systems
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Abstract
本申请提供了一种显示器件及头戴显示设备，该显示器件包括：沿图像侧至人眼方向排列的图像源、偏振起偏器、第一四分之一波长相位片、部分透射部分反射面、第二四分之一波长相位片以及反射式偏振片；其中，图像源包括第一显示屏以及第二显示屏；其中，第一显示屏的显示面及第二显示屏的显示面相对倾斜；其中的第二四分之一波长片、反射式偏振片以及由第一外凸面及第二外凸面组成的部分透射部分反射面均为共用的部件，简化了显示器件的结构，从而可减少显示器件的体积，便于小型化。另外，通过第一显示屏和第二显示屏提供图像，从而提供了较大的视场角。
The present application provides a display device and a head-mounted display device, wherein the display device comprises: an image source arranged along the image side to the human eye, a polarization polarizer, a first quarter-wavelength phase plate, a partially transmissive and partially reflective surface, a second quarter-wavelength phase plate, and a reflective polarizer; wherein the image source comprises a first display screen and a second display screen; wherein the display surface of the first display screen and the display surface of the second display screen are relatively inclined; wherein the second quarter-wavelength plate, the reflective polarizer, and the partially transmissive and partially reflective surface composed of the first convex surface and the second convex surface are all common components, which simplifies the structure of the display device, thereby reducing the volume of the display device and facilitating miniaturization. In addition, the image is provided through the first display screen and the second display screen, thereby providing a larger field of view.
Description
Technical Field
The present application relates to the field of optical technologies, and in particular, to a display device and a head-mounted display apparatus.
Background
A display device of virtual display technology (VR) may virtually display a simulated environment to give an immersive experience to a person.
The optical module of the VR display device can amplify and project the image on the display device onto the retina of human eyes through a lens system or a prism optical system, and finally presents a large-screen image with a certain sense of distance to a viewer. In order to provide a good user experience, it is desirable to provide a large angle of view, high imaging quality, and small size.
However, in the existing VR display device, there is a general problem that a FoV (Field of view) is too small or a VR device is too large in size in case of a large FoV, so that the application of the head mounted display device is limited.
Disclosure of Invention
The application provides a display device and a head-mounted display device, which improve the use effect of the display device.
The present application provides a display device including:
an image source, a polarizing polarizer, a first quarter-wavelength phase plate, a partially transmissive partially reflective surface, a second quarter-wavelength phase plate, and a reflective polarizer arranged in a direction from an image side to a human eye,
The image source comprises a first display screen and a second display screen, wherein the first display screen and the second display screen respectively correspond to one first quarter-wavelength phase plate, and the display surfaces of the first display screen and the second display screen face the same pupil of a user and are inclined relatively;
The partial transmission partial reflection surface comprises a first outer convex surface corresponding to the first display screen and a second outer convex surface corresponding to the second display screen, wherein the outer convex direction of the first outer convex surface faces the first display screen;
The reflective polarizer can transmit polarized light in a first polarization direction and reflect polarized light in a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction;
The light rays emitted by the first display screen pass through the first outer convex surface, the second quarter-wavelength phase plate and the reflection and transmission folding light path of the reflection type polaroid;
And the light rays emitted by the second display screen pass through the second external convex surface, the second quarter-wavelength phase plate and the reflection and transmission folding light path of the reflection type polaroid.
In the technical scheme, the first display screen and the second display screen are used for displaying pictures, and the light rays emitted by the first display screen and the second display screen are folded through the polarizing polarizer, the first quarter-wavelength phase plate, the partial transmission partial reflection surface, the second quarter-wavelength phase plate and the reflection type polarizing plate to form spliced images, so that a larger field angle is provided, the structure of the display device is simplified, and miniaturization is facilitated.
In a specific embodiment, the reflective polarizer is planar or aspherical.
In a specific embodiment, the reflective polarizer is an asymmetric free-form surface.
In a specific embodiment, the optical device further comprises a lens positioned between the first quarter-wavelength phase plate and the second quarter-wavelength phase plate, wherein,
A side surface of the lens facing the first quarter-wavelength phase plate comprises the first outer convex surface and the second outer convex surface;
the second quarter-wavelength phase plate is fixed at one end of the lens away from the first quarter-wavelength phase plate.
In a specific embodiment, the second quarter-wave phase plate is integrally formed with the lens, or,
The second quarter-wavelength phase plate is bonded to the lens.
In a specific embodiment, the first outer convex surface is an aspheric surface, and the second outer convex surface is an asymmetric free-form surface.
In a specific embodiment, the first outer convex surface is an asymmetric free-form surface.
In a specific embodiment, the first display screen and the second display screen are arranged along a direction of alignment of eyes of the user, and the second display screen is located on a side close to an auricle of the user.
In a specific implementation manner, the display surface of the second display screen is inclined relative to the display surface of the first display screen, and the included angle between the display surface of the first display screen and the display surface of the second display screen is greater than or equal to 5 °.
In a second aspect, a near-eye display device is provided, comprising a frame and a display device as defined in any one of the preceding claims, wherein,
The display device is fixed on the mirror frame.
In the technical scheme, the first display screen and the second display screen are used for displaying pictures, and the light rays emitted by the first display screen and the second display screen are folded through the polarizing polarizer, the first quarter-wavelength phase plate, the partial transmission partial reflection surface, the second quarter-wavelength phase plate and the reflection type polarizing plate to form spliced images, so that a larger field angle is provided, the structure of the display device is simplified, and miniaturization is facilitated.
Drawings
Fig. 1 is a schematic view of an application scenario of a display device according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a display device according to an embodiment of the present application;
Fig. 3 is a schematic diagram of image stitching according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.
It is noted that unless otherwise defined, technical or scientific terms used in one or more embodiments of the present disclosure should be taken in a general sense as understood by one of ordinary skill in the art to which the present disclosure pertains. The use of the terms "first," "second," and the like in one or more embodiments of the present description does not denote any order, quantity, or importance, but rather the terms "first," "second," and the like are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.
In order to facilitate understanding of the display device provided by the embodiment of the present application, an application scenario thereof is first described. The display device provided by the embodiment of the application is applied to different near-to-eye display systems such as AR (Augmented Reality, enhanced display technology) or VR (Virtual Reality) and is used for realizing Virtual display. However, the current near-eye display system has the common situations that the field angle is smaller or larger, but the corresponding device is larger. Therefore, the embodiment of the application provides a display device for improving the visual angle effect and miniaturization of the display device. The following detailed description is made with reference to the specific drawings and examples.
First, an angle of view, also called a field of view in optical engineering, is explained, and the size of the angle of view determines the field of view of the optical instrument. The field angle may be represented by FOV (Field of view), which is related to the focal length by image height=efl×tan (half FOV), EFL is the focal length, and FOV is the field angle.
Referring to fig. 1, fig. 1 shows a usage state reference diagram of a display device 100 according to an embodiment of the present application. For convenience of description of the display device 100 in the present application, some reference directions are defined. The first direction is the arrangement direction of human eyes. The center point of the orbital connection of two human eyes is defined as reference point O. When the display device 100 is applied to a head-mounted display apparatus, each human eye corresponds to one display device 100. When the two display devices 100 are arranged, the arrangement direction thereof is along the first direction and symmetrically arranged along the O-point, so that each eye of the user can observe the displayed image through the corresponding display device 100. The two display devices 100 are symmetrical, and thus one of the two display devices 100 will be described in detail.
Referring to fig. 2, fig. 2 shows a specific structural schematic diagram of the display device. The display device 100 provided in the embodiment of the present application includes an image source 110 and a folded light path device 120. Wherein the image source 110 is configured to provide light for display and the folded light path device 120 is configured to fold the light path to reduce the size of the display device 100. Meanwhile, the folded light path device 120 is also used to inject the light emitted from the image source 110 for displaying an image into human eyes. The specific structure of the display device 100 will be described in detail below.
In the specific setting of the image source 110, the image source 110 provided in the embodiment of the present application includes two display screens, which are respectively named as a first display screen 111 and a second display screen 112 for convenience of description. The first display 111 and the second display 112 are used for displaying information of images. The first display 111 and the second display 112 may be different types of displays such as an LCD (Liquid CRYSTAL DISPLAY), an OLED (Organic Light-Emitting Diode), and the like.
It should be understood that the first display 111 and the second display 112 are used to display part of the image information to be displayed, and the images displayed by the first display 111 and the second display 112 are spliced to form the complete image information. In practical applications, the image information displayed on the first display screen 111 and the second display screen 112 has a partially overlapped portion, and the overlapped portion is a splicing area when the first display screen 111 and the second display screen 112 are displayed, so as to ensure that the first display screen 111 and the second display screen 112 can form complete image information.
When the first display screen 111 and the second display screen 112 are specifically disposed, the first display screen 111 and the second display screen 112 are arranged along the first direction, and the display surfaces of the first display screen 111 and the second display screen 112 face the same pupil of the user. In addition, the display surfaces of the first display screen 111 and the second display screen 112 are inclined relatively, so that the display surfaces of the first display screen 111 and the second display screen 112 face the pupil of the user, and the user can watch the display conveniently. Referring to fig. 3, the first display 111 displays a main image area 10, the second display 112 displays a sub image area 30, and an image overlapping area 20 is provided between the main image area 10 and the sub image area 30, so that a complete image can be spliced.
When light rays emitted from the first display screen 111 and the second display screen 112 are transmitted to human eyes, the light rays are transmitted by folding the light path device 120. In an embodiment of the present application, folded optical path device 120 includes at least a polarizing polarizer, a first quarter-wavelength phase plate 121, a partially transmissive partially reflective surface 122, a second quarter-wavelength phase plate 123, and a reflective polarizer 124. The devices are sequentially arranged along the propagation direction of the light path so as to propagate light rays into eyes of a user for image display.
It should be understood that, when the quarter-wavelength phase plate provided by the embodiment of the present application refers to that light with a certain wavelength passes through at normal incidence, the phase difference between the outgoing ordinary light and the extraordinary light is 1/4 wavelength or approximately 1/4 wavelength, which meets the requirements of the present application. In the partial transmission and partial reflection surface, the ratio of the transmission light to the reflection light is 3:7-7:3. Exemplary, the transmitted light is 30%, the reflected light is 70%, or the transmitted light is 50%, the reflected light is 50%, or the transmitted light is 70%, the reflected light is 30%.
For ease of understanding, the role in light propagation in each device will first be described. The polarizing polarizer is used to convert light emitted from the display (the first display 111 or the second display 112) into linearly polarized light, the first quarter-wavelength phase plate 121 is used to convert linearly polarized light into elliptically polarized light, and the second quarter-wavelength phase plate 123 is used to convert linearly polarized light into elliptically polarized light or elliptically polarized light into linearly polarized light. The reflective polarizer 124 may transmit linearly polarized light of a first polarization direction and reflect polarized light of a second polarization direction. Wherein the first polarization direction is perpendicular to the second polarization direction.
In the light propagation process, light emitted from the display screen is first converted into linearly polarized light by the polarizer, and then into elliptically polarized light by the first quarter-wavelength phase plate 121. The elliptically polarized light propagates through the partially transmissive partially reflective surface 122 to the second quarter-wavelength phase plate 123, and is converted into linearly polarized light (the polarization direction is the first polarization direction) from the elliptically polarized light after passing through the second quarter-wavelength phase plate 123. The linearly polarized light is reflected to the second quarter-wavelength phase plate 123 through the reflective polarizing plate 124, and is converted into elliptically polarized light from the linearly polarized light after passing through the second quarter-wavelength phase plate 123. The elliptically polarized light passes through the second quarter-wavelength phase plate 123 again after being reflected by the partially transmissive partially reflective surface 122, and is converted into linearly polarized light (second polarization direction) again from the elliptically polarized light. The linearly polarized light is transmitted through the reflective polarizing plate 124 and then transmitted to the human eye, whereby an image is displayed. The partially transmissive and partially reflective surface 122 also has an effect on light collection, so that an image displayed on the display screen can be displayed in human eyes.
As can be seen from the above description, the folding of the optical path is achieved by the cooperation of the first quarter-wavelength phase plate 121, the partially transmissive partially reflective surface 122, the second quarter-wavelength phase plate 123, and the reflective polarizer 124 during the propagation of light, thereby reducing the size of the entire display device 100.
In order to further reduce the volume of the display device 100, some of the devices are devices used by the first display screen 111 and the second display screen 112 separately, and some of the devices are devices shared by the first display screen 111 and the second display screen 112. The details are set forth below in connection with the accompanying drawings.
With continued reference to fig. 2, when a polarizing polarizer is provided, the polarizing polarizer corresponds to the display screen one by one. Illustratively, the display surface of the first display screen 111 is provided with a polarizing polarizer for converting light emitted from the first display screen 111 into linearly polarized light. Similarly, the display surface of the second display 112 is also provided with a polarizer for converting the light emitted from the second display 112 into linearly polarized light. It should be understood that when the display surfaces of the first display 111 and the second display 112 are disposed obliquely with respect to each other, the two polarizing polarizers corresponding to the first display 111 and the second display 112 are also disposed obliquely with respect to each other.
The first quarter-wave phase plate 121 is also arranged in a one-to-one correspondence with the display screen. Illustratively, the display surface of the first display screen 111 is further provided with a first quarter-wavelength phase plate 121. The first quarter-wavelength phase plate 121 and the polarizing polarizer are arranged in the propagation direction of light, and the linearly polarized light converted by the polarizing polarizer is converted into elliptically polarized light after passing through the first quarter-wavelength phase plate 121.
Similarly, the display surface of the second display 112 is also provided with a first quarter-wavelength phase plate 121, and the first quarter-wavelength phase plate 121 is also aligned with the polarizer along the light propagation direction, and converts the linearly polarized light converted by the polarizer into elliptically polarized light.
It should be understood that when the display surfaces of the first display 111 and the second display 112 are disposed obliquely with respect to each other, the two first quarter-wavelength phase plates 121 corresponding to the first display 111 and the second display 112 are also disposed obliquely with respect to each other.
The partially transmissive and partially reflective surface 122 is a common device that cooperates with the reflective polarizer 124 to effect folding of the optical path. When the partially transmissive and partially reflective surface 122 is used in common, it has two different surfaces corresponding to the first display screen 111 and the second display screen 112, respectively, and transmits light emitted from the first display screen 111 and the second display screen 112 through the two different surfaces, respectively.
Specifically, partially transmissive partially reflective surface 122 includes first outer convex surface 1221 and second outer convex surface 1222. The first outer convex surface 1221 corresponds to the first display 111, and the second outer convex surface 1222 corresponds to the second display 112. When the first outer convex surface 1221 and the second outer convex surface 1222 are specifically disposed, the outer convex direction of the first outer convex surface 1221 faces the first display screen 111, and the outer convex direction of the second outer convex surface 1222 faces the second display screen 112, so that a side of the first outer convex surface 1221 and the second outer convex surface 1222 facing away from the first display screen 111 and the second display screen 112 is an inner concave surface, so that convergence can be achieved when light rays are reflected.
As an alternative, when the first outer convex surface 1221 and the second outer convex surface 1222 are specifically provided, they may be implemented in different ways. Illustratively, the folded optical path device 120 further includes a lens 125, the lens 125 being positioned between the first quarter-wavelength phase plate 121 and the second quarter-wavelength phase plate 123. Wherein, a side surface of the lens 125 facing the first quarter-wavelength phase plate 121 includes a first outer convex surface 1221 and a second outer convex surface 1222.
As shown in fig. 2, a side of the lens 125 facing the two first quarter-wavelength phase plates 121 has an arc-shaped convex structure protruding outward toward the two first quarter-wavelength phase plates 121, respectively. The surfaces of the two arcuate raised structures are a first outer convex surface 1221 and a second outer convex surface 1222, respectively. The first outer convex surface 1221 and the second outer convex surface 1222 are both semi-transparent and semi-reflective surfaces, so that the light emitted by the first display screen 111 and the second display screen 112 can respectively pass through the first outer convex surface 1221 and the second outer convex surface 1222, and the light reflected by the reflective polarizer 124 can be reflected to the reflective polarizer 124 through the first outer convex surface 1221 and the second outer convex surface 1222, so as to achieve folding of the light.
The lens 125 is an integral lens, i.e. two arc-shaped convex structures are formed on one lens to form a first outer convex surface 1221 and a second outer convex surface 1222. Or the lens 125 is a lens formed by splicing. The lens 125 as described above may be formed by splicing two lenses aligned in the first direction. One of the lenses has an arcuate convex configuration to form a first convex surface 1221 and the other lens has an arcuate convex configuration to form a second convex surface 1222. After the two lenses 125 are spliced and fixed, the shape of the lenses 125 as shown in fig. 2 may be formed.
It should be understood that, instead of using the surface of the lens 125 as the two outer convex surfaces (the first outer convex surface 1221 and the second outer convex surface 1222), the outer convex surface may be formed in other manners, which are not described in detail in the embodiment of the present application.
The first outer convex surface 1221 and the second outer convex surface 1222 need to perform a converging function when processing light. Accordingly, when the first outer convex surface 1221 and the second outer convex surface 1222 are provided, the first outer convex surface 1221 may employ an aspherical surface to obtain a better imaging effect than a spherical surface through the aspherical surface.
Illustratively, the first outer convex surface 1221 may employ an asymmetric free-form surface, and when an asymmetric free-form surface is employed, a smaller space envelope may be achieved, resulting in a lighter weight lens. In addition, geometrical aberrations can be reduced, and optical performance (such as image quality, depth of field, field of view, etc.) can be better improved by balancing and controlling. Meanwhile, when an asymmetric free-form surface is employed, the number of lenses used may be reduced, and thus the volume of the display device 100 may be reduced. Of course, other aspheric surfaces besides the asymmetric free-form surface of the above example may be employed as the first outer convex surface 1221, and the embodiment of the present application is not limited to the asymmetric free-form surface of the above example.
The second outer convex surface 1222 also has an asymmetric free-form surface, which can also achieve better optical performance and reduce the volume of the display device 100, and reference is made to the description of the first outer convex surface 1221.
It should be appreciated that when the first and second outer convex surfaces 1221, 1222 are specifically provided, the first and second outer convex surfaces 1221, 1222 are also relatively inclined surfaces to correspond to the first and second display screens 111, 112. Illustratively, when the first outer convex surface 1221 and the second outer convex surface 1222 are both asymmetric free-form surfaces, the asymmetric free-form surface of the first outer convex surface 1221 is inclined away from the ear, and the asymmetric free-form surface of the second outer convex surface 1222 is inclined toward the ear, with reference to the head characteristics of the user.
As an example, referring to table 1, table 1 illustrates parameter information of a specific first outer convex surface and second outer convex surface.
TABLE 1
Wherein the formula isZ represents the height of the optical axis direction, c is the inverse of the surface radius, k is the conic surface coefficient, r is the diameter of the radius direction, and the square sum of the x and y coordinates is the root number. N is the total number of polynomial coefficients in the series, ai is the coefficient of the i-th expansion polynomial. Wherein,
It should be understood that table 1 above is an example of a specific asymmetric free-form surface provided by the present application, and the specific shapes of the first outer convex surface 1221 and the second outer convex surface 1222 provided by the embodiment of the present application are not limited to the examples shown in table 1, but other asymmetric free-form surfaces may be adopted, and are not exemplified in the embodiments of the present application.
The second quarter-wave phase plate 123 is a common component, and the light emitted by the first display screen 111 and the second display screen 112 passes through the second quarter-wave phase plate 123. And converts the linearly polarized light into elliptically polarized light or converts the elliptically polarized light into linearly polarized light by the second quarter-wavelength phase plate 123.
In a specific arrangement, the side of the lens 125 facing away from the first quarter-wavelength phase plate 121 is planar, and the second quarter-wavelength phase plate 123 is fixed to the end of the lens 125 facing away from the first quarter-wavelength phase plate 121, so as to support the second quarter-wavelength phase plate 123 through the lens 125. For example, the second quarter-wave phase plate 123 may be bonded to the lens 125, and in particular, to an end of the lens 125 facing away from the first quarter-wave phase plate 121. Or by otherwise securing the second quarter-wave phase plate 123 to the lens 125 away from the first quarter-wave phase plate 121. In addition, the second quarter-wavelength phase plate 123 and the lens 125 may be integrally formed, that is, the lens 125 and the second quarter-wavelength phase plate 123 may be integrally formed, so that the components are more compact.
In the above arrangement of the second quarter-wave phase plate 123, the lens 125 may be used as a supporting structure of the second quarter-wave phase plate 123, so that the assembly between the two components is compact, and the volume of the display device 100 is reduced. Of course, other fixing methods may be used to fix the second quarter-wavelength phase plate 123 besides the above-described arrangement of the second quarter-wavelength phase plate 123, such as supporting the second quarter-wavelength phase plate 123 by other supporting structures.
The reflective polarizer 124 is also a common component, and the reflective polarizer 124 can reflect and transmit light so as to process light emitted from the first display 111 and the second display 112. The reflective polarizer 124 is a continuous polarizer, and there is no partition (the first outer convex surface 1221 and the second outer convex surface 1222) in the partially transmissive partially reflective surface 122, so that continuity of light emitted from the first display screen 111 and the second display screen 112 when the light is irradiated to the reflective polarizer 124 can be ensured, and thus difficulty in splicing images displayed on the first display screen 111 and the second display screen 112 can be reduced.
When the reflective polarizer 124 is specifically disposed, the reflective polarizer 124 may be planar or aspheric, i.e., the reflective polarizer 124 is a continuous planar or continuous aspheric surface. Illustratively, when the reflective polarizer is a continuous plane, the reflective polarizer 124 is only used to reflect or transmit light passing through the second quarter-wave phase plate 123 and does not participate in focusing the light. As shown in fig. 2, when the reflective polarizer 124 is a continuous aspheric surface, the light rays reflected by the reflective polarizer and the light rays reflected by the outer convex surface (the first outer convex surface 1221 or the second outer convex surface 1222) converge as the light rays travel between the reflective polarizer 124 and the partially transmissive partially reflective surface 122, that is, the reflective polarizer 124 may also cooperate with the partially transmissive partially reflective surface 122 to focus the light rays.
As an alternative, where the reflective polarizer 124 is aspheric, it may be an asymmetric free-form surface. Where the reflective polarizer 124 employs an asymmetric free-form surface, a smaller spatial envelope may be achieved, resulting in a lighter weight lens. In addition, geometrical aberrations can be reduced, and optical performance (such as image quality, depth of field, field of view, etc.) can be better improved by balancing and controlling. Meanwhile, when an asymmetric free-form surface is employed, the number of lenses used may be reduced, and thus the volume of the display device 100 may be reduced. Of course, the reflective polarizer 124 may employ other aspheric surfaces in addition to the asymmetric free-form surfaces illustrated above, and is not limited to the asymmetric free-form surfaces illustrated above in the embodiments of the present application.
As can be seen in connection with the above example, light rays emitted by the first display screen 111 pass through the polarizing polarizer, the first quarter-wave phase plate 121, the first outer convex surface 1221, the second quarter-wave phase plate 123, and the reflective polarizer 124. Light rays emitted by the second display 112 pass through the polarizing polarizer, the first quarter-wavelength phase plate 121, the second external convex 1222, the second quarter-wavelength phase plate 123, and the reflective polarizer 124. The polarization conversion of the light rays during propagation may be referred to the above description, and the detailed description is not repeated here. The second quarter-wave plate, the reflective polarizer 124, and the partially transmissive partially reflective surface 122 comprising the first outer convex surface 1221 and the second outer convex surface 1222 are all common components, which simplifies the structure of the display device 100, thereby reducing the volume of the display device 100 and facilitating miniaturization. In addition, providing images through the first display 111 and the second display 112 provides a larger angle of view. Thereby obtaining a display device 100 having a larger field of view and a smaller volume.
As an alternative, when the first display 111 and the second display 112 are specifically provided, one of them may be used as a main display and the other may be used as a sub display. For example, the first display 111 may be used as a main display and the second display 112 may be used as a sub display. When the first display 111 and the second display 112 are arranged along the direction of the alignment of the eyes of the user (first direction), the first display 111 is closer to the reference point O than the second display 112, that is, the first display 111 is relatively closer to the bridge of the nose of the user, and the second display 112 is located on the side closer to the auricle of the user. Such that the first display 111 is located as a primary display in a middle region of the user's field of view and the second display 112 is located opposite an edge region of the user's field of view.
When the first display screen 111 and the second display screen 112 are specifically provided, the display area of the first display screen 111 is larger than the display area of the second display screen 112. I.e. the first display 111 displays the vast majority of the image information, while the second display 112 is used for displaying the remaining image information. In the above manner, the image is divided into a main image and a sub-image and displayed on the main display (the first display 111 displays the main image) and the sub-display (the second display 112 displays the sub-image), respectively. It is ensured that most of the central visual image area of the human eye is concentrated on the first display screen 111 and part of the edge visual image area is on the second display screen 112. In addition, since the display area of the first display screen 111 is larger than that of the second display screen 112, the image connection position of the main image and the sub image is not at the center of the user field of view, but is deviated to one side of the field of view, so that the image defect at the spliced position is not easily perceived by the user, and the sensory effect of the user is improved. In addition, the image resolution of the first display screen 111 and the image resolution of the second display screen 112 satisfy that the image resolution of the first display screen 111 is not lower than the image resolution of the second display screen 112. I.e. the image resolution of the first display screen 111 is greater than or equal to the image resolution of the second display screen 112. In one possible approach, the image resolution of the first display 111 is employed to be greater than the image resolution of the second display 112. When the image resolution setting is adopted, the display picture of the second display screen 112 is positioned in the edge area of the sight line of the user, so that the requirement can be met by adopting lower resolution, and the power consumption of the whole device is reduced while the visual angle range is enlarged.
It should be appreciated that when the display area of the first display 111 is larger than the display area of the second display 112, the corresponding first outer convex surface 1221 is also larger than the second outer convex surface 1222, that is, on the side of the lens 125 facing both displays, a larger first outer convex surface 1221 and a smaller second outer convex surface 1222 are formed to match the light rays emitted from the first display 111 and the second display 112.
With continued reference to fig. 2, when the display surface of the first display screen 111 is inclined relative to the display surface of the second display screen 112, the inclination direction of the display surface of the second display screen 112 relative to the display surface of the first display screen 111 faces the user, and the included angle between the display surface of the first display screen 111 and the display surface of the second display screen 112 is equal to or greater than 5 °. Referring to the included angle α illustrated in fig. 2, in the embodiment of the present application, the included angle α is equal to or greater than d °, such as different angles of α=5°,10 °,15 °,20 °, 30 °. It should be understood that the angle of α is not infinite, and it should be sufficient that the light emitted by the first display screen 111 and the second display screen 112 can be concentrated into the eyes of the user for display.
The display surface of the first display 111 and the display surface of the second display 112 may be inclined with respect to the first direction, or the display surface of the first display 111 may be parallel to the first direction, and the display surface of the second display 112 may be inclined with respect to the first direction.
When the display surfaces of the first display screen 111 and the second display screen 112 are inclined in the first direction, the display surfaces of the first display screen 111 and the second display screen 112 satisfy that the inclination angle of the display surface of the first display screen 111 is smaller than the inclination angle of the second display screen 112. Referring to the inclination angle β of the display surface of the first display screen 111 and the inclination angle γ of the display surface of the second display screen 112 shown in fig. 2, β < γ is satisfied. For example, β is different from 0 °,1 °,3 °,5 °, and γ is different from 10 °,20 °, 30 °.
The embodiment of the application also provides a near-eye display device, which comprises a frame and the display device 100 of any one of the above, wherein the display device 100 is fixed on the frame.
In the above technical solution, the two first display screens 111 and the second display screens 112 that are inclined relatively are used to display images, and the light rays emitted from the first display screens 111 and the second display screens 112 are folded by the polarizer, the first quarter-wavelength phase plate 121, the partially-transmitting partially-reflecting surface 122, the second quarter-wavelength phase plate 123 and the reflective polarizer 124 to form a spliced image, so that a larger field angle is provided, the structure of the display device 100 is simplified, and miniaturization is facilitated.
The present disclosure is intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Any omissions, modifications, equivalents, improvements, and the like, which are within the spirit and principles of the one or more embodiments of the disclosure, are therefore intended to be included within the scope of the disclosure.
The foregoing is merely illustrative embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the technical scope of the present application, and the application should be covered. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311696458.0A CN120143453A (en) | 2023-12-11 | 2023-12-11 | Display device and head mounted display device |
| PCT/CN2024/128345 WO2025123976A1 (en) | 2023-12-11 | 2024-10-30 | Display device and head-mounted display apparatus |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311696458.0A CN120143453A (en) | 2023-12-11 | 2023-12-11 | Display device and head mounted display device |
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| CN120143453A true CN120143453A (en) | 2025-06-13 |
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| CN202311696458.0A Pending CN120143453A (en) | 2023-12-11 | 2023-12-11 | Display device and head mounted display device |
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| US9244277B2 (en) * | 2010-04-30 | 2016-01-26 | The Arizona Board Of Regents On Behalf Of The University Of Arizona | Wide angle and high resolution tiled head-mounted display device |
| EP3075150B1 (en) * | 2013-11-25 | 2022-06-15 | Tesseland LLC | Immersive compact display glasses |
| CN104932105A (en) * | 2015-06-24 | 2015-09-23 | 北京理工大学 | Splicing type head-mounted display device |
| CN105093555B (en) * | 2015-07-13 | 2018-08-14 | 深圳多新哆技术有限责任公司 | Short distance optical amplifier module and the nearly eye display optics module for using it |
| KR102014003B1 (en) * | 2015-09-03 | 2019-10-21 | 쓰리엠 이노베이티브 프로퍼티즈 컴파니 | Optical system |
| US20170115489A1 (en) * | 2015-10-26 | 2017-04-27 | Xinda Hu | Head mounted display device with multiple segment display and optics |
| CN105572894B (en) * | 2016-01-28 | 2018-05-04 | 深圳多哚新技术有限责任公司 | A kind of short distance optical amplifier module, amplification method and amplification system |
| CN107589544A (en) * | 2017-09-04 | 2018-01-16 | 浙江大学 | A kind of big visual field head-wearing display device and big field stitching method |
| US11740455B2 (en) * | 2020-08-25 | 2023-08-29 | Meta Platforms Technologies, Llc | Pupil steered display |
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