Patent Application
20250035894
This application claims priority for the CN patent application No. 202310938932X filed on 27 Jul. 2023, the content of which is incorporated by reference in its entirely.
The present invention relates to display technology, particularly to a head-mounted display device and a zoomable curved optical device thereof.
With the rapid development of science and technology, people's demand for multimedia video information is increasing day by day. Generally, common multimedia playback devices are equipped with liquid crystal displays (LCDs) or light-emitting diode (LED) displays to display images. However, the pixels and size of images displayed by the display will be limited by the size and performance of the display. The visual effect of the display is limited. It is easy to cause eye fatigue when the display is used for a long time.
Therefore, a head-mounted display (HMD) has appeared on the market. The head-mounted display is an optical product for stereoscopic vision display. It transmits the signal with the stereoscopic effect of binocular disparity to the eyes through the display elements and optical lenses arranged in front of the eyes in sequence, thereby producing a stereoscopic and large-image. Head-mounted displays are usually used in augmented reality (AR) systems or virtual reality (VR) systems. In addition to moving with the user, the HMD can also be used as an input device to receive the user's response. Besides, images and texts can also be added to the images watched by users to achieve the effect of virtual reality or augmented reality. However, the current VR glasses are implemented with plane polarized mirrors. If a higher diopter is desired, the thickness of the VR glasses must be increased, which will cause inconvenience to users.
To overcome the abovementioned problems, the present invention provides a head-mounted display device and a zoomable curved optical device thereof, so as to solve the afore-mentioned problems of the prior art.
The present invention provides a head-mounted display device and a zoomable curved optical device thereof to have light and thin properties.
In an embodiment of the present invention, a zoomable curved optical device includes a curved polarization reflection film, a waveplate, a half-mirror film, and a zoomable module. The waveplate has a first surface and a second surface opposite to each other. The half-mirror film is arranged on the first surface of the waveplate. The zoomable module is arranged on the second surface of the waveplate through an optical adhesive. The curved polarization reflection film is arranged on the zoomable module.
In an embodiment of the present invention, the waveplate is a quarter waveplate.
In an embodiment of the present invention, the half-mirror film is a curved half-mirror film.
In an embodiment of the present invention, the zoomable module includes at least one polarization dependent lens, at least one first solid lens, at least one second solid lens, a first polarization controller and a second polarization controller. The first solid lens and the second solid lens are respectively arranged on two opposite sides of the polarization dependent lens. The first polarization controller is arranged on the second surface of the waveplate through the optical adhesive and arranged between the first solid lens and the waveplate. The second polarization controller is arranged between the second solid lens and the curved polarization reflection film.
In an embodiment of the present invention, the first solid lens and the second solid lens are aspherical lenses.
In an embodiment of the present invention, the first solid lens and the second solid lens are non-polarization dependent lenses.
In an embodiment of the present invention, the polarization dependent lens is an aspherical lens.
In an embodiment of the present invention, the first surface of the waveplate faces toward the display surface of a display module through the half-mirror film and the display module is configured to transmit circularly-polarized images to the half-mirror film.
In an embodiment of the present invention, the display module is a liquid-crystal display, a micro-organic light-emitting diode (μ-OLED) module, a liquid-crystal-on-silicon display module, a digital light-processing module, or micro light-emitting diode display module.
In an embodiment of the present invention, the zoomable module is configured to control the diopter of incident light and maintain or change the polarization state of an incident polarized image according to the polarization state of the incident polarized image.
In an embodiment of the present invention, a head-mounted display device includes a curved polarization reflection film, a waveplate, a half-mirror film, a zoomable module, and a display module. The waveplate has a first surface and a second surface opposite to each other. The half-mirror film is arranged on the first surface of the waveplate. The zoomable module is arranged on the second surface of the waveplate through an optical adhesive. The curved polarization reflection film is arranged on the zoomable module. The display module has a display surface that faces toward the first surface of the waveplate through the half-mirror film. The display module is configured to transmit circularly-polarized images to the half-mirror film.
In an embodiment of the present invention, the waveplate is a quarter waveplate.
In an embodiment of the present invention, the half-mirror film is a curved half-mirror film.
In an embodiment of the present invention, the zoomable module includes at least one polarization dependent lens, at least one first solid lens, at least one second solid lens, a first polarization controller and a second polarization controller. The first solid lens and the second solid lens are respectively arranged on two opposite sides of the polarization dependent lens. The first polarization controller is arranged on the second surface of the waveplate through the optical adhesive and arranged between the first solid lens and the waveplate. The second polarization controller is arranged between the second solid lens and the curved polarization reflection film.
In an embodiment of the present invention, the first solid lens and the second solid lens are aspherical lenses.
In an embodiment of the present invention, the first solid lens and the second solid lens are non-polarization dependent lenses.
In an embodiment of the present invention, the polarization dependent lens is an aspherical lens.
In an embodiment of the present invention, the display module is a liquid-crystal display, a micro-organic light-emitting diode (μ-OLED) module, a liquid-crystal-on-silicon display module, a digital light-processing module, or micro light-emitting diode display module.
In an embodiment of the present invention, the zoomable module is configured to control the diopter of incident light and maintain or change the polarization state of an incident polarized image according to the polarization state of the incident polarized image.
In an embodiment of the present invention, the head-mounted display device and the zoomable curved optical device employ the polarization reflection film with the shorter radius of curvature to have light and thin properties without changing the optical efficiency.
Below, the embodiments are described in detail in cooperation with the drawings to make easily understood the technical contents, characteristics and accomplishments of the present invention.
Reference will now be made in detail to embodiments illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts. In the drawings, the shape and thickness may be exaggerated for clarity and convenience. This description will be directed in particular to elements forming part of, or cooperating more directly with, methods and apparatus in accordance with the present disclosure. It is to be understood that elements not specifically shown or described may take various forms well known to those skilled in the art. Many alternatives and modifications will be apparent to those skilled in the art, once informed by the present disclosure.
Throughout the description and claims, it will be understood that when a component is referred to as being “positioned on,” “positioned above,” “connected to,” “engaged with,” or “coupled with” another component, it can be directly on, directly connected to, or directly engaged with the other component, or intervening component may be present. In contrast, when a component is referred to as being “directly on,” “directly connected to,” or “directly engaged with” another component, there are no intervening components present.
Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment.
The invention is particularly described with the following examples which are only for instance. Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the following disclosure should be construed as limited only by the metes and bounds of the appended claims. In the whole patent application and the claims, except for clearly described content, the meaning of the articles “a” and “the” includes the meaning of “one or at least one” of the elements or components. Moreover, in the whole patent application and the claims, except that the plurality can be excluded obviously according to the context, the singular articles also contain the description for the plurality of elements or components. In the entire specification and claims, unless the contents clearly specify the meaning of some terms, the meaning of the article “wherein” includes the meaning of the articles “wherein” and “whereon”. The meanings of every term used in the present claims and specification refer to a usual meaning known to one skilled in the art unless the meaning is additionally annotated. Some terms used to describe the invention will be discussed to guide practitioners about the invention. The examples in the present specification do not limit the claimed scope of the invention.
Certain terms are used throughout the description and the claims to refer to particular components. One skilled in the art appreciates that a component may be referred to using different names. This disclosure does not intend to distinguish between components that differ in name but not in function. In the description and in the claims, the term “comprise” is used in an open-ended fashion, and thus should be interpreted to mean “include, but not limited to.” The phrases “be coupled to,” “couples to,” and “coupling to” are intended to encompass any indirect or direct connection. Accordingly, if this disclosure mentions that a first device is coupled with a second device, it means that the first device may be directly or indirectly connected to the second device through electrical connections, wireless communications, optical communications, or other signal connections with/without other intermediate devices or connection means.
Unless otherwise specified, some conditional sentences or words, such as “can”, “could”, “might”, or “may”, usually attempt to express what the embodiment in the present invention has, but it can also be interpreted as a feature, element, or step that may not be needed. In other embodiments, these features, elements, or steps may not be required.
In the following description, a head-mounted display device and a zoomable curved optical device will be provided, which employ a polarization reflection film with the shorter radius of curvature to have light and thin properties without changing the optical efficiency.
In some embodiments of the present invention, the zoomable module may further include at least one polarization dependent lens 240, at least one first solid lens 241, at least one second solid lens 242, a first polarization controller 243, and a second polarization controller 244. For clarity and convenience, the number of each of the polarization dependent lens 240, the first solid lens 241, and the second solid lens 242 is one. In a preferred embodiment, the polarization dependent lens 240, the first solid lens 241, and the second solid lens 242 are aspherical lenses. Each of the first solid lens 241 and the second solid lens 242 may have the radius of curvature of 50-300 mm. The first solid lens 241 and the second solid lens 242 may include glass or plastic and provide the necessary diopters to meet the requirement of the head-mounted display device 2. Specifically, the first solid lens 241 and the second solid lens 242 may be non-polarization dependent lenses. The polarization dependent lens 240 changes the refractive index and the focal length according to the polarization state of the incident light, where the focal length is the reciprocal of the diopter. The polarization dependent lens 240 may include a birefringent material. The polarization dependent lens 240 may be a liquid crystal polymer lens, a birefringent water glue or a curved phase retarder. The first solid lens 241 and the second solid lens 242 are respectively arranged on two opposite sides of the polarization dependent lens 240. The first polarization controller 243 is arranged on the second surface of the waveplate 21 through the optical adhesive 23 and arranged between the first solid lens 241 and the waveplate 21. The second polarization controller 244 is arranged between the second solid lens 242 and the curved polarization reflection film 20. In general, each of the first polarization controller 243 and the second polarization controller 244 may have two conductive light-transmitting substrates and a liquid-crystal layer therebetween. When the two conductive light-transmitting substrates are biased, the alignment direction of the liquid crystal molecules in the liquid-crystal layer is changed to change the polarization state of the incident light.
The zoomable module 24 controls the diopter of the incident light and maintains or changes the polarization state of an incident polarized image according to the polarization state of the incident polarized image. Specifically, when the display module 25 emits left circularly-polarized light, the left circularly-polarized light passes through the half-mirror film 22 and the waveplate 21 in sequence to form horizontally-polarized light. When the horizontally polarized light passes through the optical adhesive 23, the first polarization controller 243, the first solid lens 241, the polarization dependent lens 240, the second solid state lens 242, and the second polarization controller 244 in sequence, the focal length and diopter of the zoomable module 24 are determined according to the polarization state of the horizontally-polarized light. When the horizontally-polarized light passes through the second polarization controller 244, the second polarization controller 244 can maintain the polarization state of the horizontally-polarized light or convert the horizontally-polarized light into vertically-polarized light. When the second polarization controller 244 converts the horizontally-polarized light into vertically-polarized light, the vertically-polarized light passes through the curved polarization reflection film 20 and enters a human eye 3. If the second polarization controller 244 maintains the polarization state of the horizontally polarized light, the curved polarization reflection film 20 reflects the horizontally-polarized light, so that the horizontally-polarized light passes through the zoomable module 24, the optical adhesive 23, the waveplate 21 and the half-mirror film 22 in sequence. The waveplate 21 converts the horizontally-polarized light into left circularly-polarized light. The half-mirror film 22 reflects the left circularly-polarized light to form right circularly-polarized light. When the right circularly-polarized light passes through the waveplate 21, the waveplate 21 converts the right circularly-polarized light into vertically-polarized light. The vertically-polarized light passes through the optical adhesive 23, the zoomable module 24 and the curved polarization reflection film 20 in sequence and enters the human eye 3.
The curved polarization reflection film 20 can be used to adjust aberrations to improve optical imaging quality, wherein the radius R of curvature of the curved polarization reflection film 20 is 50-300 mm, as shown in Table 1.
As shown in Table 1, different R values correspond to the variations of the diopter and the additional diopter values that can be provided after the incident light is reflected by the curved surface. For example, when the incident light is not reflected by the curved surface, the curved polarization reflection film 20 with R of 50 mm will provide a diopter of 10 m−1. If the incident light is reflected by the curved surface, the diopter of 50 m−1 can be obtained. In addition, if the curved surface of the curved polarization reflection film 20 with R of 250 mm reflects the incident light, the diopter of 10 m−1 can be also obtained, which will be the same as the diopter of the curved polarization reflection film 20 with R of 50 mm. Therefore, under the premise of obtaining the same diopter, the zoomable curved optical device can be made thinner by forming the curved polarization reflection film 20. That is to say, in order to obtain the same diopter, the zoomable curved optical device becomes the thinner when the radius of curvature of the curved polarization reflection film 20 is the longer. Therefore, the head-mounted display device and the zoomable curved optical device adopt the polarization reflection film with a shorter radius of curvature without changing the optical effect, so as to have light and thin properties.
According to the embodiments provided above, the head-mounted display device and the zoomable curved optical device have light and thin properties.
The embodiments described above are only to exemplify the present invention but not to limit the scope of the present invention. Therefore, any equivalent modification or variation according to the shapes, structures, features, or spirit disclosed by the present invention is to be also included within the scope of the present invention.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310938932X | Jul 2023 | CN | national |
