TWI878929B - Head-up display device - Google Patents

Abstract

A shield for a helmet is provided and the shield is served as a projection screen for a head-up display device. The shield includes an object lens, and an ocular lens. The ocular lens is positioned above the object lens. The object lens reflects an image displayed on the head-up display device at a front-bottom of the helmet, the image being reflected by the object lens and then projected to the ocular lens, after that, the image is reflected by the ocular lens to rear of the ocular lens. The aforementioned arrangement reduces electronic components attached to the helmet and further provides an embodiment in regard to the head-up display device and a head-up display system for the helmet.

Description

Heads-up display

The present invention relates to a head-up display device provided for a rider, which can reduce the number of electronic components installed on a helmet.

Taiwan Patent No. M563171 discloses a helmet with a head-up display, which includes a helmet, an optical module and a reflector. The helmet includes a body and a lens, which is fastened to the body through a fastener; the optical module is arranged at the brim of the body and adjacent to the fastener, and projects an image; the reflector is arranged below the optical module and is located on the optical path of the optical module projecting the image to receive the image and reflect the image to the rider's eyes, and the content of the image is the traffic conditions in front of the rider, which helps the rider to know the current road conditions.

Many prior arts have disclosed that the display module of the head-up display is combined with a motorcycle helmet, and the image provided to the rider is displayed on the shield in front of the helmet. However, if a folded light path is designed inside the helmet, an optical module (such as a display module) is installed, or a plurality of camera modules are installed, the helmet itself will appear bulky, causing the center of gravity to shift, thus affecting the protective effect of the helmet.

To solve the above problems, the present invention provides a helmet shield which serves as a projection screen for a head-up display device on a motor vehicle.

The aforementioned shield includes an objective lens and an eyepiece, wherein the eyepiece is arranged above the objective lens. The objective lens is used to reflect a display image from a head-up display device located on the mobile vehicle. The display image is reflected by the objective lens and then projected to the eyepiece. Then, the display image is reflected by the eyepiece to the rear of the eyepiece. The aforementioned arrangement can reduce the number of electronic components installed on the helmet.

Preferably, the display image is reflected by the front surface of the objective lens and then projected onto the rear surface of the eyepiece.

Preferably, the objective lens is a convex spherical surface or a hyperbolic spherical surface.

Preferably, the objective lens is provided with a reflective film, and the reflectivity of the reflective film is between 50% and 80%.

Preferably, the eyepiece is a concave spherical surface or a hyperbolic transparent spherical surface, and the angle between the eyepiece and the lead hammer line is greater than the angle between the objective lens and the lead hammer line.

Preferably, the objective lens and the eyepiece are two separate covers.

Preferably, the protective cover has an opening between the objective lens and the eyepiece, or a connecting cover is provided between the objective lens and the eyepiece.

Preferably, the shield further comprises a first rotating shaft assembly for adjusting the position of the objective lens.

Preferably, the shield further includes a second shaft assembly for adjusting the position of the eyepiece.

The present invention also provides a safety helmet, comprising any of the aforementioned protective shields, and a front opening is provided on the cap body of the safety helmet.

Preferably, the helmet further comprises an angle detection module.

Preferably, the helmet further comprises a first wireless module.

The present invention further provides a head-up display device, which is arranged on a mobile vehicle, and includes a second wireless module and a display module. The second wireless module receives an angle message associated with the shield. The display module selectively projects a display image to the shield in a high brightness mode or a low brightness mode according to the angle message. When the angle message is maintained within a riding angle range, the display module projects the display image with high brightness, and when the angle message is not within the riding angle range, the display module projects the display image with low brightness. The aforementioned riding angle range is defined according to the angle between the shield and a horizontal plane.

Preferably, the protective cover includes an objective lens and an eyepiece, wherein the objective lens is used to reflect the display image, and the display image is projected onto the eyepiece after being reflected by the objective lens.

Preferably, the display image is reflected by the front surface of the objective lens and then projected onto the rear surface of the eyepiece.

Preferably, the display module projects the display image onto a shield of a helmet.

Preferably, the helmet has an angle detection module to generate angle information.

Preferably, the head-up display device further includes an acceleration sensor to detect angle information changed due to inertia.

Preferably, there is matching information between the second wireless module and the helmet, and the display module projects the display image onto the shield according to the matching information.

Preferably, the display module has more than two display brightness levels.

The directions described below are based on the forward direction of the motor vehicle when the rider is riding the motor vehicle, so as to conform to the general understanding of ordinary people. The motor vehicle mentioned above refers to a two-wheeled or three-wheeled vehicle with handlebars to control the steering of the front wheel, such as a motorcycle or a scooter. However, it can also be other lightweight mobile vehicles, such as bicycles and electric bicycles.

Please refer to FIG. 1 and FIG. 2 , which illustrate a safety helmet including a helmet body 1 and a protective cover 2 .

The body 11 of the cap body 1 has a front opening 12;

The shield 2 includes an objective lens 21 and an eyepiece 22. The objective lens 21 and the eyepiece 22 are shield bodies extending from the side surfaces 13 at both ends of the shield 2 to the middle. The side surfaces 13 of the shield 2 are connected to the body 11, so that the shield 2 is located at the front opening 12. The objective lens 21 is arranged at the lower half of the shield 2, and the eyepiece 22 is arranged at the upper half of the shield 2.

The objective lens 21 is used to reflect a display image D projected by the head-up display device 3 at the front lower part of the helmet. After being reflected by the objective lens 21, the display image D is projected to the eyepiece 22, and then projected to the rider's eyes. Specifically, the display image D is first projected to the front surface of the objective lens 21, then the display image D is reflected and projected to the rear surface of the eyepiece 22, and then the display image D is projected to the rider's eyes.

In this way, the interior of the helmet does not need to be equipped with a reflective light path, and almost no electronic components (especially display modules) are required, so that the rider can see the display image of the HUD without affecting the protective effect of the helmet itself. If the shield 2 is damaged, the helmet can be continuously used by simply replacing the shield 2.

In addition, the head-up display device 3 can be set at the position of the motor vehicle or the hood of the motorcycle, so the distance (object distance) between the rider and the head-up display device 3 is longer, which produces a farther imaging distance compared to the conventional helmet combined with HUD.

In this embodiment, the objective lens 21 is a convex spherical surface or a hyperbolic spherical surface, and the surface of the objective lens 21 is coated or coated with a reflective coating to increase the reflectivity of the displayed image. The surface reflectivity of the objective lens 21 is between 50% and 80%, so the objective lens 21 will not completely block the rider's line of sight below.

The eyepiece 22 is a concave spherical or hyperbolic transparent spherical surface. The angle between the eyepiece and the lead hammer line is greater than the angle between the objective lens and the lead hammer line. The rider can see the real scene in front and the display image at the same time. The eyepiece 22 magnifies the display image D several times and forms an image at a distance several times longer than the object distance, so that the display image D seen by the eyes is formed and magnified at a visual distance of 4 to 6 meters.

In this embodiment, the shield 2 is an open shield, and the objective lens 21 and the eyepiece 22 are two separate shield bodies extending from the side surfaces 13 at both ends of the shield 2 to the middle. There is an opening 23 between the objective lens 21 and the eyepiece 22, so that wind can be sent in from the opening 23 to prevent the rider from getting stuffy.

The shield 2 can be changed into a closed shield (not shown), that is, there is a connecting shield between the objective lens 21 and the eyepiece 22 to prevent wind and rain from entering the helmet and causing discomfort to the rider.

In addition, the side surfaces 13 at both ends of the protective cover 2 include a first shaft assembly 24, which is connected to both sides of the main body 11 and is used to adjust the angle of the objective lens 21, or to adjust the angles of the objective lens 21 and the eyepiece 22 at the same time. As shown in FIG. 3 , the objective lens 21 and the eyepiece 22 are separate covers, and the angles of the objective lens 21 and the eyepiece 22 can be adjusted separately.

The helmet shown in FIG. 4 is different from the embodiment shown in FIG. 1 in that the shield 2 further includes a second shaft assembly 25, and the second shaft assembly 25 pivots the objective lens 21 and the eyepiece 22, so that the objective lens 21 can pivot relative to the eyepiece 22 to adjust the reflection angle of the displayed image D.

It is worth mentioning that the aforementioned shield 2 can also be worn directly on the user's body. For example, the shield 2 can be made in the form of an eye mask, and the side surface 13 of the shield 2 can form a bracket and be worn on the head.

Please refer to FIG. 2 and FIG. 5 together, the display system 100 includes a head-up display device 3 and a helmet. The head-up display device 3 is installed on the instrument panel of the motor vehicle or motorcycle to replace the instrument display panel on the motorcycle, and the helmet is worn by the rider. The specific structure and function of the helmet and the shield have been described above, so it will not be repeated.

The main body 11 of the helmet includes an angle detection module 27, a first wireless module 26 and a battery (not shown). The battery supplies power to the aforementioned electronic components. The angle detection module 27 is a gyroscope, an acceleration sensor, or an image sensor that identifies the angle of the helmet through image recognition and generates a helmet angle message 271 in response to the rider's head lowering or raising action. The first wireless module 26 transmits the helmet angle message 271 wirelessly.

The head-up display device 3 includes a control module, a display module 31 and a second wireless module 32. The display image D projected by the display module 31 has at least two modes: a high brightness mode and a low brightness mode. The second wireless module 32 receives a helmet angle message 271. The control module of the head-up display device 3 controls the brightness of the display image D displayed by the display module 31 according to the helmet angle message 271.

Relative to the angle of the helmet during riding, when the helmet is tilted forward, the display image D is in low brightness mode, allowing the rider to lower his head and read directly through the transparent helmet shield, as shown in FIG6 . The display image D at this time can be set as an instrument screen, and it can also prevent the excessive sunlight from affecting the rider's reading of the instrument panel. Compared to directly projecting onto the windshield (of a motor vehicle) to form a head-up display image for the user to identify, this embodiment can project the display image D onto the shield 2 with a lower display brightness, so that the user can identify it.

When the helmet is maintained within the riding angle range (close to an upright state), the display image D is in high brightness mode, as shown in FIG. 7, so that the rider can look up and read the image in front. The display image D at this time can be set as a HUD screen. In addition, the aforementioned riding angle can be set when the rider is about to ride a motorcycle to avoid being affected by the difference in the angle of the individual wearing the helmet. In addition, the display module 31 can have more than two (for example, more than three) display brightnesses, and the display brightness of the high brightness mode is higher than the display brightness of the low brightness mode. The head-up display device 3 further includes a light sensing module that can detect the brightness of the use environment, such as broad daylight or night, and adjust the brightness of the display image D.

The first wireless module 26 and the second wireless module 32 are Bluetooth modules and have matching information. The main body 11 and the head-up display device 3 each have an authentication chip to ensure that the first wireless module 26 and the second wireless module 32 are correctly matched. The head-up display device 3 projects the display image D onto the protective cover of the specific full hat according to the matching information, so the head-up display device 3 will not receive wrong angle information and produce wrong display brightness. In addition, the head-up display device 3 can be connected to a smart phone to send navigation information to the head-up display device 3 through push.

Alternatively, the first wireless module 26 and the second wireless module 32 may be an RFID reader and an RFID chip respectively. The RFID chip is electrically connected to the angle detection module 27. The control module of the head-up display device 3 records the identification code of the RFID chip and reads the helmet angle information 271 stored in the RFID chip according to the identification code. The helmet does not need to be equipped with an actively connected wireless module, and the battery life of the electronic components inside the helmet body can be extended.

In addition, the head-up display device 3 further includes an acceleration sensor, such as a gravity sensor (G sensor) 33, to compensate for the erroneous judgment of the helmet due to the inertial shaking of the motorcycle when accelerating or decelerating.

In addition, the display module 31 is a high-efficiency and high-brightness display panel, which generates a high-backlight brightness, high-contrast display image D, and generates a screen brightness of about 40,000 nits at a controllable heating temperature.

1: Cap body 11: Body 12: Front opening 13: Side surface 2: Shield 21: Objective lens 22: Eyepiece 23: Opening 24: First axis assembly 25: Second axis assembly 26: First wireless module 27: Angle detection module 271: Helmet angle information 3: Head-up display device 31: Display module 32: Second wireless module 33: Gravity sensor D: Display image 100: Display system

Fig. 1 is a schematic diagram of a first embodiment of a safety helmet.

FIG2 is a schematic diagram of the optical path between the helmet and the head-up display module.

FIG. 3 is a schematic diagram of a second embodiment of a safety helmet.

FIG. 4 is a schematic diagram of a third embodiment of a safety helmet.

FIG5 is a block diagram of the display system.

Figure 6 and Figure 7 are schematic diagrams showing the use of the display system.

11: Body

21:Objective lens

22: Eyepiece

23: Open mouth

3: Heads-up display device

D: Display image

Claims (10)

A head-up display device, suitable for being arranged on a mobile vehicle, comprises: A second wireless module, receiving an angle message of a shield; A display module, selectively projecting a display image to the shield in a high brightness mode or a low brightness mode according to the angle message; Wherein, when the angle message is maintained within a riding angle range, the display module projects the display image in the high brightness mode, and when the angle message is not within the riding angle range, the display module projects the display image in the low brightness mode; Wherein, when the angle message is maintained within the riding angle range, the display module displays a HUD screen, and when the angle message is not within the riding angle range, the display module displays a meter screen. A head-up display device as described in claim 1, wherein the protective cover includes an objective lens and an eyepiece, the objective lens is used to reflect the display image, and the display image is projected onto the eyepiece after being reflected by the objective lens. A head-up display device as described in claim 2, wherein the display image is reflected by the front surface of the objective lens and then projected onto the rear surface of the eyepiece. A heads-up display device as described in claim 1, wherein the display module projects the display image onto the shield of a helmet. A heads-up display device as described in claim 4, wherein the helmet has an angle detection module to generate the angle information. The head-up display device as described in claim 1 further includes an acceleration sensor to detect the angle information changed due to inertia. A heads-up display device as described in claim 4, wherein there is pairing information between the second wireless module and the helmet, and the display module projects the display image onto the shield based on the pairing information. A heads-up display device as described in claim 1, wherein the display module has more than two display brightnesses. The head-up display device as described in claim 1 or 8 further includes a light sensing module electrically connected to the display module, the light sensing module is used to detect an ambient brightness, and the display module adjusts the brightness of the displayed image according to the ambient brightness. A head-up display device as described in claim 1, wherein the riding angle range is defined based on the angle between the shield and a horizontal plane, and when the angle information is maintained within the riding angle range, the display module projects the display image in the high brightness mode, and when the angle information is greater than the riding angle range, the display module projects the display image in the low brightness mode.