Patent Application
20240402490
This application claims the priority benefit of China application serial no. 202310645468.5, filed on Jun. 2, 2023. The entirety of the above-mentioned patent application is hereby incorporated by reference herein and made a part of this specification.
The disclosure relates to a display device, and particularly relates to a vehicle display device.
In current society, in addition to the power performance of vehicles, the requirements for vehicle have also begun to focus on vehicle safety equipment. The assistance of driving assistance products (such as vehicle interior voice navigation system, voice collision warning system), has indeed reduced the incidence of accidents caused by drivers' fatigue driving lack of concentration. However, at the same time, the non-voice information display device (driving assistance product) is usually installed on the dashboard, and when the driver looks down, it is likely to affect driving safety.
Existing head-up display (HUD) for vehicles presents the driving information in front of the driver, so that the driver does not need to take his eyes away from the front of the vehicle, and can help driving safety. When the driver is driving the vehicle, images with different traffic information or driving assistance functions may be displayed in different positions by the HUD, so that the driver may obtain corresponding information at different positions of the windshield. However, because when the driver is driving the car, the human eyes focus on the far-end (about 20 meters) most of the time, so when the human eye changes focus back and forth between looking at the virtual image generated by the HUD and the external things, it may cause eye fatigue and driving hazards easily. Therefore, multiple virtual image distances (VID) are currently designed to reduce the discomfort caused by the human eye when the focus distance is too long. However, this method has the problems of large volume and high cost of the HUD.
The information disclosed in this Background section is only for enhancement of understanding of the background of the described technology and therefore it may contain information that does not form the prior art that is already known to a person of ordinary skill in the art. Further, the information disclosed in the Background section does not mean that one or more problems to be resolved by one or more embodiments of the invention was acknowledged by a person of ordinary skill in the art.
The disclosure provides a vehicle display device, configured to provide a first light beam and a second light beam to an imaging element, the vehicle display device including a light source module, a light splitting element, a first polarization reflection module, and a second polarization reflection module. The light source module provides the first light beam having a first polarization state and the second light beam having a second polarization state. The light splitting element is disposed on the transmission path of the first light beam and the second light beam from the light source module and configured to reflect the first light beam having the first polarization state and allow the second light beam having the second polarization state to pass through. The first polarization reflection module is disposed on the transmission path of the first light beam from the light splitting element and configured to reflect the first light beam to the light splitting element and convert the first polarization state of the first light beam into the second polarization state. The second polarization reflection module is disposed on the transmission path of the first light beam and the second light beam from the light splitting element and configured to reflect the first light beam and the second light beam and convert the first light beam and the second light beam with the second polarization state into the first light beam and the second light beam with a third polarization state. The first light beam with the third polarization state forms a far-field virtual image through the imaging element, and the second light beam with the third polarization state forms a near-field virtual image through the imaging element.
Other objectives, features and advantages of the present invention will be further understood from the further technological features disclosed by the embodiments of the present invention wherein there are shown and described preferred embodiments of this invention, simply by way of illustration of modes best suited to carry out the invention.
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the disclosure and, together with the description, serve to explain the principles of the disclosure.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings which form a part hereof, and in which are shown by way of illustration specific embodiments in which the invention may be practiced. In this regard, directional terminology, such as “top,” “bottom,” “front,” “back,” etc., is used with reference to the orientation of the Figure(s) being described. The components of the present invention can be positioned in a number of different orientations. As such, the directional terminology is used for purposes of illustration and is in no way limiting. On the other hand, the drawings are only schematic and the sizes of components may be exaggerated for clarity. It is to be understood that other embodiments may be utilized and structural changes may be made without departing from the scope of the present invention. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including,” “comprising,” or “having” and variations thereof herein is meant to encompass the items listed thereafter and equivalents thereof as well as additional items. Unless limited otherwise, the terms “connected,” “coupled,” and “mounted” and variations thereof herein are used broadly and encompass direct and indirect connections, couplings, and mountings. Similarly, the terms “facing,” “faces” and variations thereof herein are used broadly and encompass direct and indirect facing, and “adjacent to” and variations thereof herein are used broadly and encompass directly and indirectly “adjacent to”. Therefore, the description of “A” component facing “B” component herein may contain the situations that “A” component directly faces “B” component or one or more additional components are between “A” component and “B” component. Also, the description of “A” component “adjacent to” “B” component herein may contain the situations that “A” component is directly “adjacent to” “B” component or one or more additional components are between “A” component and “B” component. Accordingly, the drawings and descriptions will be regarded as illustrative in nature and not as restrictive.
The disclosure provides a vehicle display device, which can improve the optical efficiency of a far-field virtual image and a near-field virtual image or reduce the power consumption of a light source module, and enable a user to obtain image information with a high brightness when wearing sunglasses.
Other purposes and advantages of the disclosure may be further understood from the technical characteristics revealed by the disclosure.
The light source module 110 provides the first light beam L1 having a first polarization state (e.g., linear polarization state) and the second light beam L2 having a second polarization state (e.g., linear polarization state). It should be further explained that, in
The polarization element 114 is disposed on the transmission path of the first light beam L1 and the second light beam L2 from the at least one display panel 112. The polarization element 114 is, for example, a linear polarizer configured to polarize the first light beam L1 and the second light beam L2, so that the first light beam L1 and the second light beam L2 have the first polarization state. The first half-wave plate 116 is (only) disposed on the transmission path of the second light beam L2 from the polarization element 114 and configured to convert the second light beam L2 with the first polarization state into the second light beam L2 with the second polarization state. It should be noted that the term “convert” here refers to the change of the polarization state of the light beam due to phase delay. For example, in this embodiment, the light beam provided by the at least one display panel 112 is transmitted through the polarization element 114 and then converted into the S-polarized light, and a part of the S-polarized light is further transmitted through the first half-wave plate 116 and converted into the P-polarized light, and the other part of the S-polarized light is not transmitted to the first half-wave plate 116. Therefore, the S-polarized light not transmitted to the first half-wave plate 116 may be defined as the first light beam L1, and the light beam transmitted through the first half-wave plate 116 (converted into the P-polarized light) may be defined as the second light beam L2. However, in other embodiments, the S-polarized light and the P-polarized light may be provided by the light source module 110 in different ways, and the disclosure is not limited thereto.
The light splitting element 120 is disposed on the transmission path of the first light beam L1 and the second light beam L2 from the light source module 110. The light splitting element 120 is, for example, a polarization beam splitter configured to reflect the first light beam L1 having the first polarization state and allow the second light beam L2 having the second polarization state to pass through. For example, in this embodiment, the light splitting element 120 reflects the S-polarized light and allows the P-polarized light to pass through. Therefore, the first light beam L1 with the S-polarized from the light source module 110 is transmitted to the light splitting element 120 and reflected by the light splitting element 120, while the second light beam L2 with the P-polarized from the light source module 110 is transmitted to the light splitting element 120 will pass through the light splitting element 120.
The first polarization reflection module 130 is disposed on the transmission path of the first light beam L1 from the light splitting element 120 and configured to reflect the first light beam L1 to the light splitting element 120 and convert the first light beam L1 with the first polarization state into the first light beam L1 with the second polarization state. In detail, in this embodiment, the first polarization reflection module 130 includes a quarter-wave plate 132 and a first reflection element 134. The quarter-wave plate 132 is disposed on the transmission path of the first light beam L1 from the light splitting element 120 and configured to convert the polarization state of the first light beam L1. The first reflection element 134 is disposed on the transmission path of the first light beam L1 from the quarter-wave plate 132 (As shown in
The second polarization reflection module 140 is disposed on the transmission path of the first light beam L1 and the second light beam L2 from the light splitting element 120, and The second polarization reflection module 140 is configured to reflect the first light beam L1 and the second light beam L2 and convert the first light beam L1 and the second light beam L2 with the second polarization states into the first light beam L1 and the second light beam L2 with third polarization states. In detail, in this embodiment, the second polarization reflection module 140 includes a second reflection element 142 and a second half-wave plate 144. The second reflection element 142 is disposed on the transmission path of the first light beam L1 and the second light beam L2 from the light splitting element 120 and configured to reflect the first light beam L1 and the second light beam L2. The second half-wave plate 144 is disposed on the transmission path of the first light beam L1 and the second light beam L2 from the second reflection element 142 and configured to convert the first light beam L1 and the second light beam L2 with the second polarization states into the first light beam L1 and the second light beam L2 with the third polarization states. The second reflection element 142 is, for example, a free curved surface reflection mirror. The second half-wave plate 144 may rotate horizontally relative to the display panel 112 (that is, changing the included angle between an optical axis of the second half-wave plate 144 and the polarization axis of the first light beam L1) to adjust the third polarization states of the first light beam L1 and the second light beam L2. For example, in this embodiment, the first light beam L1 with the P-polarized and the second light beam L2 with the P-polarized from the light splitting element 120 are reflected by the second reflection element 142 and transmitted through the second half-wave plate 144; in which, when the second half-wave plate 144 does not rotate relative to the display panel 112 (that is, the optical axis of the second half-wave plate 144 corresponds to the polarization axis of the first light beam L1), the first light beam L1 with the P-polarized and the second light beam L2 with the P-polarized are converted into the first light beam L1 with the S-polarized and the second light beam L2 with the S-polarized respectively. In other words, the third polarization states are equal to the first polarization state; However, if the second half-wave plate 144 is horizontally rotated by 0° to 45° relative to the display panel 112, then the first light beam L1 with the P-polarized and the second light beam L2 with the P-polarized may be converted into the circularly polarized state or the elliptically polarized state. In other words, the third polarization states are different from the first polarization state. In addition, in this embodiment, the second half-wave plate 144 may be used as a protective cover to further protect the optical system (e.g., from the light source module 110 to the second polarization reflection module 140), to prevent foreign objects from entering the optical system and affecting the optical effect.
In some embodiments, the vehicle display device 100 may further include an adjustment device (not shown), the adjustment device may be connected to the first reflection element 134 of the first polarization reflection module 130 to adjust the rotation angle of the first reflection element 134, or the adjustment device may be connected to the second reflection element 142 of the second polarization reflection module 140 to adjust the rotation angle of the second reflection element 142. In addition, the adjustment device may also be connected to the first reflection element 134 and the second reflection element 142 at the same time, and the disclosure is not limited thereto. In this way, the position and the incident angle of the first light beam L1 and the second light beam L2 transmitted to the subsequent optical element can be further adjusted to obtain a good display effect.
In addition, in this embodiment, the vehicle display device 100 further includes a third reflection element 160 disposed on the transmission path of the second light beam L2 from the light splitting element 120 and configured to reflect the second light beam L2 to the second polarization reflection module 140. The third reflection element 160 is, for example, a planar surface mirror, but the disclosure is not limited thereto. In this way, the degree of freedom in planning the optical path can be increased or the optical path can be shortened, thereby obtaining a good display effect.
Regarding
In summary, in the vehicle display device of the disclosure, the light source module provides the first light beam having the first polarization state and the second light beam having the second polarization state. Through the optical effect of the light splitting element, the first polarization reflection module, and the second polarization reflection module, the first light beam and the second light beam having the same polarization state can be transmitted to the imaging element for imaging, so as to form the far-field virtual image and the near-field virtual image having the same polarization state through the imaging element respectively. In this way, the optical efficiency of the far-field virtual image and the near-field virtual image can be improved or the power consumption of the light source module can be reduced, and the user can obtain image information with a high brightness when wearing sunglasses.
The foregoing description of the preferred embodiments of the invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise form or to exemplary embodiments disclosed. Accordingly, the foregoing description should be regarded as illustrative rather than restrictive. Obviously, many modifications and variations will be apparent to practitioners skilled in this art. The embodiments are chosen and described in order to best explain the principles of the invention and its best mode practical application, thereby to enable persons skilled in the art to understand the invention for various embodiments and with various modifications as are suited to the particular use or implementation contemplated. It is intended that the scope of the invention be defined by the claims appended hereto and their equivalents in which all terms are meant in their broadest reasonable sense unless otherwise indicated. Therefore, the term “the invention”, “the present invention” or the like does not necessarily limit the claim scope to a specific embodiment, and the reference to particularly preferred exemplary embodiments of the invention does not imply a limitation on the invention, and no such limitation is to be inferred. The invention is limited only by the spirit and scope of the appended claims. Moreover, these claims may refer to use “first”, “second”, etc. following with noun or element. Such terms should be understood as a nomenclature and should not be construed as giving the limitation on the number of the elements modified by such nomenclature unless specific number has been given. The abstract of the disclosure is provided to comply with the rules requiring an abstract, which will allow a searcher to quickly ascertain the subject matter of the technical disclosure of any patent issued from this disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. Any advantages and benefits described may not apply to all embodiments of the invention. It should be appreciated that variations may be made in the embodiments described by persons skilled in the art without departing from the scope of the present invention as defined by the following claims. Moreover, no element and component in the present disclosure is intended to be dedicated to the public regardless of whether the element or component is explicitly recited in the following claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 202310645468.5 | Jun 2023 | CN | national |
