Head-up display device

Abstract

A head-up display device includes a display element, a first reflective element and a second reflective element. The display element provides an image beam. The image light beam comprises a first light beam and a second light beam, wherein the first light beam and the second light beam are emitted from different positions of the display element. The first reflecting element is arranged on a transmission path of the image light beam from the display element and is used for reflecting the image light beam. The second reflection element is arranged on a transmission path of the image light beam from the first reflection element and is used for reflecting the image light beam, and a main light ray of the first light beam and a main light ray of the second light beam emitted from the display element form an intersection point on the first reflection element or between the display element and the first reflection element. According to the head-up display device provided by the invention, fewer optical elements are used, the optical path length can be shortened, and the size can be reduced.

Description

Technical Field

[0001] The present invention relates to a display device, and in particular to a head-up display device. Background Art

[0002] In today's society, in addition to performance, the requirements for vehicles are also beginning to focus on the requirements for vehicle interior and safety equipment. The assistance of these technological products (such as in-car voice navigation systems, voice collision warning systems, etc.) has indeed improved the accident rate caused by drivers' long-term fatigue driving and lack of concentration. But at the same time, non-voice information display devices are usually installed on the dashboard, which can easily affect driving safety when the driver looks down.

[0003] A head-up display (HUD) presents the information required by the driver in front of the driver, so that the driver does not need to be distracted by lowering or turning his head, which can help traffic safety. If the head-up display is installed in the car, when the driver is driving the car, pictures with different traffic information or auxiliary driving functions can be displayed at different positions, so that the driver can obtain corresponding information at different positions of the windshield. However, the current head-up display is bulky due to the large number of internal components, resulting in the problem of interference between the head-up display itself and other components inside the car body.

[0004] The "background technology" section is only used to help understand the content of the present invention. Therefore, the content disclosed in the "background technology" section may contain some known technologies that are not known to those skilled in the art. The content disclosed in the "background technology" section does not mean that the content or the problems to be solved by one or more embodiments of the present invention have been known or recognized by those skilled in the art before the application of the present invention. Summary of the invention

[0005] The invention provides a head-up display device which uses fewer optical elements and can shorten the optical path length and reduce the volume.

[0006] Other purposes and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0007] To achieve one or part or all of the above purposes or other purposes, the present invention provides a head-up display device, including a display element, a first reflective element and a second reflective element. The display element provides an image beam. The image beam includes a first beam and a second beam, wherein the first beam and the second beam are emitted from different positions of the display element. The first reflective element is arranged on the transmission path of the image beam from the display element to reflect the image beam. The second reflective element is arranged on the transmission path of the image beam from the first reflective element to reflect the image beam, wherein the main light of the first light beam emitted from the display element and the main light of the second light beam form an intersection on the first reflective element or between the display element and the first reflective element.

[0008] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the head-up display device of the present invention, the head-up display device includes a display element, a first reflective element, and a second reflective element. The display element provides an image beam to the first reflective element, the first reflective element reflects the image beam to the second reflective element, and the second reflective element reflects the image beam and forms an image through the imaging element. Among them, the image beam includes a first beam and a second beam, and the main light of the first beam emitted by the display element and the main light of the second beam form an intersection on the first reflective element or between the display element and the first reflective element. In this way, compared with the traditional head-up display, the design of the present invention uses fewer optical elements, and the size of the first reflective element can be designed to be the minimum size, thereby shortening the optical path length of the head-up display device and reducing the volume of the head-up display device.

[0009] In order to make the above features and advantages of the present invention more clearly understood, embodiments are given below with reference to the accompanying drawings for detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 FIG. 4 is a schematic diagram of a head-up display device according to an embodiment of the present invention.

[0011] Figure 2 for Figure 1 A comparison diagram of the overall spot size of the head-up display device on the first reflective element and the prior art.

[0012] Figure 3 for Figure 1 A comparison diagram of a portion of the spot size of the head-up display device on the first reflective element with that of the prior art.

[0013] Description of reference numerals:

[0014] 50: Imaging element

[0015] 100: Head-up display

[0016] 110: Display components

[0017] 120: First reflective element

[0018] 130: Second reflective element

[0019] L: Display beam

[0020] L1: Chief ray of the first beam

[0021] L2: The chief ray of the second beam

[0022] A1: First side

[0023] A2: Second side

[0024] B1, B2: Light spot

[0025] C1: First light spot

[0026] C2: Second light spot

[0027] M: Midpoint

[0028] P: Intersection point

[0029] VM: virtual image

[0030] X, Y, Z: Coordinate axes

[0031] P1: First position

[0032] P2: Second position. DETAILED DESCRIPTION

[0033] The above-mentioned other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying drawings. The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only the directions with reference to the accompanying drawings. Therefore, the directional terms used are used to illustrate and not to limit the present invention.

[0034] Figure 1 This is a schematic diagram of a head-up display device according to an embodiment of the present invention. Figure 1. The present embodiment provides a head-up display device 100, including a display element 110, a first reflective element 120, and a second reflective element 130. The display element 110 provides an image beam L, and the image beam L is transmitted to the outside of the head-up display device 100 by the first reflective element 120 and the second reflective element 130. The head-up display device 100 is, for example, a head-up display for a vehicle. The imaging element 50 reflects the image beam L from the head-up display device 100 to the eyes of a viewer (for example, a driver of a vehicle), so that the viewer can see a virtual image VM with driving information in front of the imaging element 50. The display element 110 is, for example, a picture generation unit (PGU), but is not limited thereto. The imaging element may be a windshield or a see-through combiner, etc.

[0035] The image beam L includes a first beam and a second beam. The first beam has a main light beam L1, and the second beam has a main light beam L2. Figure 1 Only the main beam L1 of the first light beam and the main beam L2 of the second light beam are illustrated as examples. Specifically, the first light beam and the second light beam carry different image information, and are emitted from different positions P1 and P2 of the display element 110, respectively. For example, in the present embodiment, the effective display area of ​​the display element 110 has a first display area and a second display area, and the first light beam is emitted from the first display area, and the second light beam is emitted from the second display area. However, the present embodiment does not limit the area ratio of the two different display areas on the display element 110. In the present embodiment, on the display element 110, the first position P1 where the first light beam is emitted is closer to the second reflective element 130 than the position P2 where the second light beam is emitted, but the present invention is not limited thereto.

[0036] The first reflective element 120 is disposed on the transmission path of the image beam L from the display element 110 to reflect the image beam L. The second reflective element 130 is disposed on the transmission path of the image beam L from the first reflective element 120 to reflect the image beam L to the imaging element 50 outside the head-up display device 100. In detail, in the present embodiment, the first reflective element 120 and the second reflective element 130 are curved reflectors, and the reflective surfaces of the first reflective element 120 and the second reflective element 130 are both freeform surfaces. In addition, in the head-up display device 100 of the present embodiment, only the first reflective element 120 and the second reflective element 130 are disposed, that is, only these two reflective optical elements are disposed in the head-up display device 100, and no other reflective optical elements are disposed. On the other hand. In the present embodiment, no other optical elements are disposed on the optical path of the image beam between the display element 110 and the first reflective element 120. Therefore, compared with the conventional head-up display, the design of the present embodiment has fewer optical elements and can save volume.

[0037] It is worth mentioning that the present embodiment is a secondary imaging optical system. On the optical path of the image light beam L traveling from the display element 110 to the imaging element 50, an intermediate image is formed between the first reflecting element 120 and the second reflecting element 130. The advantage of this secondary imaging optical system architecture is that it can shorten the optical path length and reduce the volume. Furthermore, in the present case, the first light beam and the second light beam emitted from different positions P1 and P2 of the display element 110 are transmitted non-parallel, that is, the image light beam L provided by the display element 110 gradually converges during the process of being transmitted toward the first reflecting element 120, that is, the image light beam L emitted from the display element 110 is convergent light. In more detail, the main light beam L1 of the first light beam emitted from the display element 110 and the main light beam L2 of the second light beam form an intersection point P on the first reflecting element 120 or between the display element 110 and the first reflecting element 120. For example, Figure 1 In the embodiment of the invention, the intersection point P is located on the first reflective element 120, and the intersection point P of the chief light beam L1 of the first light beam and the chief light beam L2 of the second light beam is located on the minimum light spot formed by the image light beam L, where the minimum light spot is the minimum cross-sectional area of ​​the image light beam L on the transmission path in the head-up display device 100. However, in different embodiments, the light path of the image light beam L between the display element 110 and the first reflective element 120 has a middle point M, and when the intersection point P is located between the display element 110 and the first reflective element 120, the intersection point P is located between the middle point M and the first reflective element 120. That is, the intersection point P is located at a position closer to the first reflective element 120.

[0038] Figure 2 for Figure 1A comparison diagram of the overall spot size of the head-up display device on the first reflective element and the prior art. It should be noted that since the first reflective element 120 is not a planar reflective element, Figure 2 The XY plane formed by the X-axis and the Y-axis is a reference plane for forming a light spot on the first reflective element 120, and the normal line of the reference plane is the Z-axis. Figure 1 and Figure 2 . Figure 1 For example, the intersection point P is located on the first reflective element 120 as an embodiment, the first light beam forms a first light spot C1 on the first reflective element 120, and the second light beam forms a second light spot C2 on the first reflective element 120. Compared with the prior art, this embodiment can more effectively shorten the optical path length and reduce the area of ​​the first reflective element 120 by designing the intersection point P of the main light beam L1 of the first light beam and the main light beam L2 of the second light beam to be located on the first reflective element 120 or between the display element 110 and the first reflective element 120, thereby reducing the volume of the head-up display device 100. For example, by Figure 2 The position distribution of different light spots B1 and B2 formed on the reflective element of the head-up display in the prior art is shown, and Figure 1 From the position distribution of the first light spot C1 and the second light spot C2 formed on the first reflective element 120 in the head-up display device 100 of the embodiment, it can be seen that the overlapping relationship between the multiple light spots formed by all the light beams in the image light beam L shortens the overall light spot formed by the image light beam L in the X-axis from 195.7 mm to 157.2 mm, that is, the overall light spot length of the head-up display device 100 of the embodiment is shortened by 20% compared with the head-up display of the prior art, and the overall light spot formed by the image light beam L is shortened from 71.7 mm to 33.52 mm in the Y-axis, that is, the overall light spot height of the head-up display device 100 of the embodiment is shortened by 53% compared with the head-up display of the prior art. It can be seen that, compared with the conventional head-up display, the head-up display device 100 of the embodiment can shorten the length and height of the overall light spot formed by the image light beam L on the first reflective element 120, thereby reducing the size of the first reflective element 120 and the volume of the head-up display device 100.

[0039] Figure 3 for Figure 1 A comparison diagram of the size of a portion of the light spot formed on the first reflective element of the head-up display device of FIG. 1 and the prior art. Please refer to Figure 1 and Figure 3In this embodiment, for example, the overlapping area of ​​the first light spot C1 corresponding to the first light beam and the second light spot C2 corresponding to the second light beam on the first reflective element 120 is at least greater than 90%. In this way, the size of the first reflective element 120 can be designed to be the minimum size, thereby reducing the volume of the head-up display device 100.

[0040] In summary, in the head-up display device of the present invention, the head-up display device includes a display element, a first reflective element, and a second reflective element. The display element provides an image beam to the first reflective element, the first reflective element reflects the image beam to the second reflective element, and the second reflective element reflects the image beam and forms an image through the imaging element. The image beam includes a first beam and a second beam, and the main light of the first beam emitted by the display element and the main light of the second beam form an intersection on the first reflective element or between the display element and the first reflective element. In this way, compared with the traditional head-up display, the design of the present invention uses fewer optical elements, and the size of the first reflective element can be designed to be the minimum size, thereby shortening the optical path length of the head-up display device and reducing the volume of the head-up display device.

[0041] However, the above is only a preferred embodiment of the present invention, and it cannot be used to limit the scope of the implementation of the present invention. That is, all simple equivalent changes and modifications made according to the claims and the content of the invention of the present invention are still within the scope of the patent of the present invention. In addition, any embodiment or claim of the present invention does not need to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract and title (invention name) are only used to assist in the retrieval of patent documents, and are not used to limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name the name of the element or distinguish different embodiments or scopes, and are not used to limit the upper or lower limit on the number of elements.

Claims

1. A head-up display device, characterized in that: The head-up display device includes a display element, a first reflective element and a second reflective element, wherein: The display element provides an image beam, wherein the image beam includes a first beam and a second beam, wherein the first beam and the second beam are emitted from different positions of the display element; The first reflective element is disposed on a transmission path of the image light beam from the display element to reflect the image light beam; and The second reflecting element is configured on the transmission path of the image light beam from the first reflecting element to reflect the image light beam, wherein the main light beam of the first light beam emitted from the display element and the main light beam of the second light beam form an intersection on the first reflecting element or between the display element and the first reflecting element.

2. The head-up display device according to claim 1, characterized in that: The intersection point of the principal ray of the first light beam and the principal ray of the second light beam is located on the minimum light spot formed by the image light beam.

3. The head-up display device according to claim 1, characterized in that: The optical path of the image light beam between the display element and the first reflective element has a middle point, and when the intersection point is located between the display element and the first reflective element, the intersection point is located between the middle point and the first reflective element.

4. The head-up display device according to claim 1, characterized in that: The image light beam emitted from the head-up display is transmitted to an imaging element and forms a virtual image through the imaging element.

5. The head-up display device according to claim 1, characterized in that: The reflection surfaces of the first reflection element and the second reflection element are both free-form surfaces.

6. The head-up display device according to claim 1, characterized in that: The head-up display device has only two reflective optical elements, namely the first reflective element and the second reflective element.

7. The head-up display device according to claim 1, characterized in that: The image light beam provided by the display element is convergent light between the display element and the first reflective element.

8. The head-up display device according to claim 1, characterized in that: No optical element is arranged between the display element and the first reflective element.

9. The head-up display device according to claim 1, characterized in that: The first light beam emitted from the display element is not parallel to the second light beam.

10. The head-up display device according to claim 1, characterized in that: The first light beam is emitted from a position on the display element closer to the second reflective element than the second light beam.

11. The head-up display device according to claim 1, characterized in that: The first light beam forms a first light spot on the first reflecting element, and the second light beam forms a second light spot on the first reflecting element. The overlapping area of ​​the first light spot and the second light spot on the first reflecting element is at least greater than 90%.

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