CN115755385A - Display device - Google Patents

Abstract

The present disclosure proposes a display device, including: a support member; a display screen connected to the support member, the display screen being integrated with a light modulating element; the support member includes: an image generating device and a free-form surface device; the image generation device is used for generating an image and projecting the image to the free-form surface device based on a first incidence direction; the free-form surface device is used for modulating the direction of image light rays so as to deflect the first incidence direction into a first emergence direction and projecting an image to the light modulation element based on the first emergence direction; and the light modulation element is used for assisting the display screen to display images. Can be under the condition of not introducing too much extra part, can promote display device's demonstration visual field promptly effectively to can promote image display effect effectively, and, can directly show the formation of image after modulating the direction of image light, thereby can reduce optical energy loss to a great extent, improve the visual imaging effect of image light.

Description

Display device

Technical Field

The present disclosure relates to mixed reality technologies, and particularly to a display device.

Background

In the related art, in the display device based on augmented reality, the display is usually realized by adopting a design based on an optical waveguide.

In this way, the longer the transmission distance of the light in the waveguide transmission is, the more serious the energy loss generated by absorption and partial total reflection is, and meanwhile, in order to avoid the light leakage phenomenon, a light barrier needs to be added, so that the volume of the display device is increased to a certain extent by the light barrier, and the expansion of the field of view is limited.

Disclosure of Invention

The present disclosure is directed to solving, at least to some extent, one of the technical problems in the related art.

Therefore, an object of the present disclosure is to provide a display device, which can effectively improve a display field of view of the display device without introducing too many additional components, so as to effectively improve an image display effect, and can directly display and image after modulating a direction of image light, so as to reduce optical energy loss to a greater extent and improve a visual imaging effect of the image light.

To achieve the above object, a display device according to an embodiment of the present disclosure includes: a support member; a display screen connected to the support member, the display screen being integrated with a light modulating element; the support member includes: an image generating device and a free-form surface device; the image generation device is used for generating an image and projecting the image to the free-form surface device based on a first incidence direction; the free-form surface device is used for modulating the direction of image light rays so as to deflect the first incidence direction into a first emergence direction and projecting an image to the light modulation element based on the first emergence direction; and the light modulation element is used for assisting the display screen to display images.

The display device that this disclosed embodiment provided, has included the supporting component, the display screen that is connected with the supporting component, and the display screen is integrated with light modulation component, and the supporting component includes: the image generation device is used for generating an image and projecting the image to the free-form surface device based on a first incidence direction, the free-form surface device is used for modulating the direction of image light rays so as to deflect the first incidence direction into a first emergent direction and projecting the image to the optical modulation element based on the first emergent direction, and the optical modulation element is used for assisting a display screen to display the image and can effectively improve the display view field of the display device without introducing excessive additional components, so that the image display effect can be effectively improved, and the image can be directly displayed and imaged after the direction of the image light rays is modulated, so that the optical energy loss can be greatly reduced, and the visual imaging effect of the image light rays is improved.

Additional aspects and advantages of the disclosure will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the disclosure.

Drawings

The above and/or additional aspects and advantages of the present disclosure will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic structural diagram of a display device according to an embodiment of the disclosure;

fig. 2 is a schematic structural diagram of a display device according to an embodiment of the disclosure;

fig. 3 is a schematic structural diagram of a display device according to another embodiment of the disclosure;

fig. 4 is a schematic structural diagram of an AR glasses display device according to an embodiment of the disclosure;

fig. 5 is a schematic structural diagram of a head-up digital display HUD according to an embodiment of the present disclosure;

Detailed Description

Reference will now be made in detail to the embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of illustrating the present disclosure and should not be construed as limiting the same. On the contrary, the embodiments of the disclosure include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.

Fig. 1 is a schematic structural diagram of a display device according to an embodiment of the present disclosure.

As shown in fig. 1, the display device 10 includes:

a support member 101, a display screen 102 connected to the support member 101, the display screen 102 having an integrated light modulation element 103, the support member 101 comprising: the image display device comprises an image generating device 104 and a free-form surface device 105, wherein the image generating device 104 is used for generating an image and projecting the image to the free-form surface device 105 based on a first incidence direction, the free-form surface device 105 is used for modulating the direction of image light rays so as to deflect the first incidence direction to a first emergence direction and projecting the image to a light modulation element 103 based on the first emergence direction, and the light modulation element 103 is used for assisting the display screen 102 to display the image.

The supporting component 101 is connected to the display screen 102, and is configured to support the display screen 102 to assist the display screen 102 to display.

For example, in an Augmented Reality (AR) glasses display, the support part 101 may be a temple portion of the AR glasses, the support part 101 includes an image generation device 104 and a free form surface device 105, the image generation device 104 is used as an image source for generating an image and projecting the image to the free form surface device 105 in the form of image light, and the free form surface device 105 may be used for modulating the direction of the image light.

In the embodiment of the present disclosure, when the image generation device 104 projects an image to the free-form surface device 105, the image is projected based on a first incident direction, where the first incident direction may be a certain angle formed by the image light and the free-form surface device 105, and after the image light enters the free-form surface device 105, the free-form surface device 105 modulates the image light, for example, some parameters (for example, amplitude, frequency, phase, and the like) of the light wave corresponding to the image light may be modulated according to a certain rule, and after modulation, the first incident direction is deflected by a certain angle to be a first exit direction, and the image is projected to the light modulation element 103 based on the first exit direction to assist the display screen 102 to display the image. Here, the first incident direction is a direction in which the image generation device 104 in fig. 1 projects toward the free-form surface device 105, and the first exit direction is a direction in which the free-form surface device 105 in fig. 1 projects toward the light modulation element 103.

In the embodiment of the present disclosure, the display screen 102 is integrated with the light modulation element 103, that is, the display screen 102 and the light modulation element 103 may be integrally disposed, so that the occupation of the space of the display screen 102 can be effectively reduced.

The light modulation element 103 is used to control the intensity of light, and can assist the display screen 102 to display images.

In this embodiment, since the light modulation element 103 is integrated in the display screen 102 to modulate the image light, the direction of the image light can be deflected while the intensity of the image light is enhanced, so as to better assist the display screen 102 in displaying the image.

In the embodiment of the present disclosure, the free-form surface device 105 may be a device capable of modulating the direction of the image light, for example, the free-form surface device 105 may be a curved surface reflection device manufactured by a special process, and specifically, for example, may be a glass material, or any other possible material, which is not limited thereto.

Optionally, in some embodiments, as shown in fig. 2, fig. 2 is a schematic structural diagram of a display device according to another embodiment of the present disclosure.

In the embodiment of the present disclosure, the image light may be composed of a plurality of emergent lights, the plurality of emergent lights respectively correspond to the plurality of pixel points 106, and the plurality of pixel points 106 are located on the image generating device 104.

The image is composed of a plurality of pixel points, and when the image generation device 104 projects the image, a plurality of corresponding emergent rays are respectively emitted from the plurality of pixel points 106, and the plurality of emergent rays are projected to form an image.

In this embodiment, the free-form surface device 105 may be configured to modulate the direction of the image light to deflect the first incident direction into the first emergent direction, and may be configured to pre-compensate a plurality of optical paths corresponding to a plurality of emergent light rays respectively.

The optical path is a folding quantity, and may be a distance traveled by the light in the vacuum within the same time. Under the condition of the same propagation time or the same phase change, the path traveled by the light in the medium is converted into a corresponding path traveled by the light in vacuum, and the emergent light may generate a deviation in the reflection process, which is called an optical path difference.

The free-form surface device 105 is configured to modulate a direction of light, and may pre-compensate optical paths of emergent light corresponding to different pixel points projected by the image generating device.

In the embodiment, the free-form surface device 105 is configured to pre-compensate the optical path, so that the optical path difference generated when the image light is reflected from the free-form surface device 105 to the light modulation element 103 is reduced, and the light intensity decline in the light transmission process is reduced.

Optionally, in some embodiments, as shown in fig. 3, fig. 3 is a schematic structural diagram of a display device according to another embodiment of the disclosure.

In the embodiment of the present disclosure, the support member 101 includes: a polarization beam splitter prism 107, wherein the image generating device 104 is configured to project the image to the polarization beam splitter prism 107 based on a second incident direction, and the first incident direction and the second incident direction are different.

The direction in which the image generation device 104 projects an image to the polarization splitting prism 107 in fig. 3 may be referred to as a second incident direction.

The image generation device 104 projects each pixel point in the image to the polarization splitting prism 107 in a form corresponding to the image light, the image light is projected to the polarization splitting prism 107 in a direction, which may be referred to as a second incident direction, as shown in fig. 1 and 3, the image generation device 104 in fig. 1 and 3 may be disposed at different positions, and thus the first incident direction and the second incident direction of the image light projected onto the free-form surface device 105 are different, thereby effectively ensuring the flexibility of the structural design of the display device, and the auxiliary display device can effectively adapt to the use requirements of the personalized scene.

The polarization splitting prism 107 is an optical element for separating the horizontal polarization and the vertical polarization of the image light.

In the embodiment of the present disclosure, the polarization splitting prism 107 may be configured to split image light to obtain a first linearly polarized light and a second linearly polarized light, reflect the first linearly polarized light, and transmit the second linearly polarized light, where the first linearly polarized light corresponds to the second emitting direction, the second linearly polarized light corresponds to the third emitting direction, and the second emitting direction and the third emitting direction are perpendicular to each other.

The second outgoing direction is a direction in which the polarization splitting prism 107 in fig. 3 projects toward the free-form surface device 105, and the third outgoing direction is a direction in which the image generation device 105 in fig. 3 projects toward the non-lens 110.

For example, a Polarization Beam Splitter 107 (PBS) may be used to split the non-polarized image light incident on the Polarization Beam Splitter 107 into two perpendicular linearly polarized lights, i.e., S-polarized light and P-polarized light, wherein the S-polarized light may be regarded as a first linearly polarized light, the Polarization Beam Splitter 107 reflects the first linearly polarized light at an angle of 45 °, the P-polarized light may be regarded as a second linearly polarized light, and the Polarization Beam Splitter 107 transmits the second linearly polarized light.

The polarization beam splitter prism transmits the second linearly polarized light, and the transmission direction of the second linearly polarized light can be referred to as a third emission direction, the polarization beam splitter prism transmits the first linearly polarized light, and the reflection direction of the first linearly polarized light can be referred to as a second emission direction. In the embodiment of the present disclosure, since the polarization splitting prism 107 is used to separate the horizontal linear polarization and the vertical linear polarization of the image light, the transmittance of the second linear polarization can be ensured, the deflection angle of the image light is reduced, the phenomenon of light leakage is avoided, and the imaging quality is improved.

Optionally, in some embodiments, the support member 101 comprises: and an illumination element 108, wherein the illumination element 108 is configured to project the illumination light to the polarization splitting prism 107, and the polarization splitting prism 107 is configured to split the illumination light to obtain a third polarized light and a fourth polarized light, reflect the third polarized light, and transmit the fourth polarized light, wherein the third polarized light corresponds to the third outgoing direction, and the fourth polarized light corresponds to the second outgoing direction.

The second outgoing direction is a direction in which the polarization splitting prism 107 in fig. 3 projects toward the free-form surface device 105, and the third outgoing direction is a direction in which the polarization splitting prism 107 in fig. 3 projects toward the non-lens 110.

The polarization beam splitter prism 107 reflects the third-line polarized light, and the reflection direction of the third-line polarized light may be referred to as a third emission direction, and the polarization beam splitter prism 107 transmits the fourth-line polarized light, and the transmission direction of the fourth-line polarized light may be referred to as a second emission direction. In this embodiment, since the lighting element 108 is used, the image light can be supplemented, and the display effect of the display device is improved.

Optionally, in some embodiments, the polarization beam splitter prism 107 is configured to project the first line polarization and the fourth line polarization to the free-form surface device 105 based on the second exit direction, that is, after the image light and the illumination light are split by the polarization beam splitter prism 107, a part of the line polarization is projected onto the free-form surface device 105 in the form of an exit light, so that the image light can be supplemented by the illumination light, and an effect of enhancing image display is achieved. Above-mentioned image light carries out the beam split after polarization beam splitter prism 107, obtain first line polarisation and second line polarisation, after illumination light carries out the beam split through polarization beam splitter prism 107, obtain third line polarisation and fourth line polarisation, wherein, polarization beam splitter prism 107 reflects first line polarisation based on the second outgoing direction, transmit fourth line polarisation based on the second outgoing direction, two way line polarisation can be the same on second outgoing direction throws to free-form surface device 105, thereby can utilize light modulation component 103 can strengthen and modulate image light, promote the formation of image effect.

In the embodiment of the present disclosure, the free-form surface device 105 is configured to deflect the second emitting direction into a fourth emitting direction, and project the first line polarization and the fourth line polarization to the light modulation element 103 based on the fourth emitting direction, so as to control the light intensity by using the light modulation element 103.

Here, the fourth emission direction is a direction in which the free-form surface device 105 projects toward the light modulation element 103 in fig. 3.

After the free-form surface device 105 deflects the light direction, the first line polarization light and the fourth line polarization light are combined and projected onto the free-form surface device 105, the free-form surface device 105 deflects the second emergent direction corresponding to the combined line polarization light at a certain angle to obtain a fourth emergent direction, and projects the line polarization light to the light modulation element 103 in the fourth emergent direction, and the light modulation element 103 can enhance and modulate the image light.

Optionally, in some embodiments, the supporting member 101 includes a wave plate 109, wherein the polarization splitting prism 107 is configured to project the second linearly polarized light and the third linearly polarized light to the wave plate 109 based on the third exit direction. The image light is split by the polarization splitting prism 107 to obtain a first linearly polarized light and a second linearly polarized light, and split by the polarization splitting prism 107 to obtain a third linearly polarized light and a fourth linearly polarized light, wherein the polarization splitting prism 107 transmits the second linearly polarized light based on a third emitting direction, the polarization splitting prism 107 reflects the third linearly polarized light based on the third emitting direction, and the two paths of linearly polarized lights can be projected onto the wave plate 109 in the same third emitting direction, so that an additional optical path difference between the second linearly polarized light and the third linearly polarized light can be determined by the wave plate 109, the additional optical path difference generated in the light splitting process is compensated, and the light intensity degradation in the light transmission process is reduced.

In the embodiment of the present disclosure, the wave plate 109 is used to determine an additional optical path difference between the second linear polarization and the third linear polarization, and the additional optical path difference is used for pre-compensation.

The additional optical path difference is generated when the polarization beam splitter prism 107 splits light, the polarization beam splitter prism 107 is formed by gluing a pair of high-precision right-angle prisms, and the oblique side of one prism is coated with a polarization beam splitting dielectric film.

In the embodiment, the wave plate is used for determining the additional optical path difference between the second line polarization and the third line polarization, so that the optical path difference generated in the light splitting process can be properly compensated, and the imaging effect is improved.

Optionally, in some embodiments, the support member 101 comprises a non-lens 110 disposed parallel to the wave plate 109.

The non-lens 110 is configured to converge the second line polarization light and the third line polarization light based on the additional optical path difference to obtain converged light, and project the converged light to the polarization splitting prism 107.

After the image light and the illumination light are split by the polarization splitting prism 107, linearly polarized light is obtained, the polarization splitting prism 107 transmits the second linearly polarized light, and reflects the third linearly polarized light, the emitting directions of the second linearly polarized light and the third linearly polarized light are both the third emitting directions, and then the non-lens 110 can be utilized to converge the second linearly polarized light and the third linearly polarized light based on the additional optical path difference, so that the converged light is projected to the polarization splitting prism 107.

The polarization splitting prism 107 pre-compensates a plurality of optical paths corresponding to the plurality of outgoing rays, respectively, based on an additional optical path difference carried by the converged rays.

In this embodiment, the non-lens 110 is used to converge the linearly polarized light and project the linearly polarized light to the polarization beam splitter prism 107, so that the polarization beam splitter prism 107 can be used to pre-compensate a plurality of optical paths corresponding to a plurality of emergent rays respectively based on the additional optical path difference carried by the converged light, thereby reducing the direction deviation in the light transmission process and reducing the light intensity decline in the light transmission process.

Optionally, in some embodiments, the lighting elements 108 are light emitting diodes.

The light emitting diode is a commonly used light emitting device, can efficiently convert electric energy into light energy, can uniformly and stably project illumination light, has high response speed, and can effectively assist in imaging.

Alternatively, in some embodiments, the light modulation element 103 is any one of: holographic optical elements, microlens arrays, super-surface structures, and microstructured gratings.

The holographic optical element is an optical element manufactured according to the holography principle, is usually made on a photosensitive film material, works based on the principles of refraction and reflection of geometric optics, and can enhance and deflect image light.

The micro lens array has the characteristics of small unit size and high integration level, the display device can be designed to be light and thin, the size of the head-mounted display device is reduced, and the flexibility of the structural design of the display device is ensured.

The super-surface structure can be used for regulating and controlling light polarization.

The microstructure grating has higher optical performance and can reduce the volume of the head-mounted display device.

Optionally, in some embodiments, the image is a hologram of a three-dimensional scene.

The display device 10 is a hologram that can realize three-dimensional display, and the image projected by the image generation device 102 can use a three-dimensional scene.

Optionally, in some embodiments, the display device 10 is augmented reality AR glasses or a heads up digital display HUD.

For example, as shown in fig. 4, fig. 4 is a schematic structural diagram of an AR glasses display device in an embodiment of the present disclosure, wherein a temple portion may be regarded as a support member 101, and a lens portion may be regarded as a display screen 102.

For example, as shown in fig. 5, fig. 5 is a schematic structural diagram of a Heads Up Display (HUD) in an embodiment of the disclosure.

In the embodiment of the present disclosure, the setting positions of the elements in the display device and the angular relationships between the elements may be configured adaptively according to the requirements of the actual scene of the display device, which is not limited in the embodiment of the present disclosure.

The display device provided in this embodiment is a display screen connected to a supporting member by configuring the supporting member, the display screen being integrated with a light modulation element, the supporting member including: the image generation device is used for generating an image and projecting the image to the free-form surface device based on a first incidence direction, the free-form surface device is used for modulating the direction of image light rays so as to deflect the first incidence direction into a first emergent direction and projecting the image to the optical modulation element based on the first emergent direction, and the optical modulation element is used for assisting a display screen to display the image and can effectively improve the display view field of the display device without introducing excessive additional components, so that the image display effect can be effectively improved, and the image can be directly displayed and imaged after the direction of the image light rays is modulated, so that the optical energy loss can be greatly reduced, and the visual imaging effect of the image light rays is improved.

It should be noted that, in the description of the present disclosure, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present disclosure, "a plurality" means two or more unless otherwise specified.

Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps in the process, and alternate implementations are included within the scope of the preferred embodiment of the present disclosure in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present disclosure.

It should be understood that portions of the present disclosure may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following technologies, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

In addition, functional units in the embodiments of the present disclosure may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.

The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although embodiments of the present disclosure have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure, and that changes, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present disclosure.

Claims (10)

1. A display device, comprising:

a support member;

a display screen connected to the support member, the display screen integrating a light modulating element;

the support member includes: an image generating device and a free-form surface device;

the image generation device is used for generating an image and projecting the image to the free-form surface device based on a first incidence direction;

the free-form surface device is used for modulating the direction of image light rays so as to deflect the first incidence direction into a first emergence direction, and projecting the image to the light modulation element based on the first emergence direction;

the light modulation element is used for assisting the display screen to display the image.

2. The display device according to claim 1, wherein the image light is composed of a plurality of emergent light corresponding to a plurality of pixel points respectively, the plurality of pixel points being located in the image generating device,

the free-form surface device is used for pre-compensating a plurality of optical paths corresponding to the emergent rays respectively.

3. The display device according to claim 1, wherein the support member includes: a polarization splitting prism, wherein,

the image generating device is used for projecting the image to the polarization beam splitter prism based on a second incidence direction, and the first incidence direction is different from the second incidence direction;

the polarization splitting prism is used for splitting the image light to obtain a first linearly polarized light and a second linearly polarized light, reflecting the first linearly polarized light, and transmitting the second linearly polarized light, wherein the first linearly polarized light corresponds to a second emergent direction, the second linearly polarized light corresponds to a third emergent direction, and the second emergent direction and the third emergent direction are perpendicular to each other.

4. The display device according to claim 3, wherein the support member includes: an illumination element, wherein,

the illumination element is used for projecting illumination light to the polarization beam splitter prism;

the polarization beam splitter prism is used for right illuminating light divides to obtain third line polarization and fourth line polarization, and right the third line polarization reflects, and right the fourth line polarization transmits, wherein, the third line polarization corresponds to the third outgoing direction, the fourth line polarization corresponds to the second outgoing direction.

5. The display device according to claim 4, wherein,

the polarization splitting prism is used for projecting the first line polarized light and the fourth line polarized light to the free-form surface device based on the second emergent direction;

the free-form surface device is configured to deflect the second emission direction into a fourth emission direction, and project the first line polarization and the fourth line polarization to the light modulation element based on the fourth emission direction, so as to project the image to the light modulation element.

6. The display device according to claim 4, wherein the support member includes: a wave plate, wherein,

the polarization splitting prism is used for projecting the second linearly polarized light and the third linearly polarized light to the wave plate based on the third emergent direction;

the wave plate is used for determining an additional optical path difference between the second line polarization and the third line polarization, and the additional optical path difference is used for pre-compensation.

7. The display device according to claim 6, wherein the support member includes: a non-lens disposed parallel to the wave plate, wherein,

the non-lens is used for converging the second linearly polarized light and the third linearly polarized light based on the additional optical path difference to obtain converged light, and projecting the converged light to the polarization splitting prism;

and the polarization beam splitter prism is used for pre-compensating a plurality of optical paths corresponding to the emergent rays respectively based on the additional optical path difference carried by the converged rays.

8. The display device according to any one of claims 1 to 7, wherein the light modulation element is any one of:

holographic optical elements, microlens arrays, super-surface structures, and microstructured gratings.

9. The display device of any one of claims 1-7, wherein the image is a hologram of a three-dimensional scene.

10. The display device according to any one of claims 1 to 7, wherein the display device is augmented reality AR glasses or a heads up digital display HUD.

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