TWI494603B - Portable head-up display device - Google Patents

Description

Portable head-up display device

A display device, in particular, a portable head-up display device that is small in modularization and simple to install.

In a driving environment, the driver needs to receive various information such as speed, water temperature, engine speed, gear position and fuel quantity at any time. For example, in the cockpit of a car, the above message is displayed on the dashboard, and the dashboard is usually matched with the vehicle. The body is designed to be placed under the windshield.

During the driving process, the driver needs to grasp the changes of the surrounding environmental conditions through the windshield. However, the human eye has limited vision. Therefore, while observing the surrounding road conditions through the windshield, it is still necessary to shift the line of sight to the dashboard set under the windshield to watch the speed of the vehicle. The shift of the line of sight often causes the driver to The momentary distraction caused the driving accident to occur.

In order to solve the above problems, there is a emergence of a Head-Up Display Device (HUD). As the name implies, the function of the head-up display device is to allow the driver to know the speed, the amount of fuel, etc. without having to look down at the dashboard.

Conventional head-up display devices come in many different forms, one of which is in the wind An LED display box is arranged under the glass, and the signal of the LED display box is reflected to the driver through the reflective film disposed on the windshield. However, in this form of head-up display device, the image is not enlarged, so that the image is too small, and the image focus point is too close to the windshield, so that the driver still needs to perform the action of the field of view to obtain the desired message, and thus The effect of the head-up display unit cannot be fully utilized.

Another form of head-up display device provides a magnifying glass set in front of a display such as an LED or LCD, and then reflects the magnified image through the optical system to the driver. However, this type of head-up display device requires a complicated optical system to solve problems such as chromatic aberration and image distortion, resulting in an oversized bulk display device, and the optical system needs to be matched with the vehicle manufacturer to be set when the vehicle is built. The cost of construction is too large. Moreover, under the situation that the ambient light is too strong, the image presented by such a head-up display device is easy to be confused or the brightness is insufficient to identify the problem.

In order to solve the above problems, it is an object of the present invention to provide a portable head-up display device. The portable head-up display device adopts a modular design and can be easily installed in a car to reduce the complexity of construction. The portable head-up display device uses the micro-projector as the image source, and passes through an optical path guiding module after the micro-projector projects the image. The light path guiding module includes a light diffusing plate or a frosted glass, thereby increasing the brightness and contrast of the image to protect against external strong light. After the image is converted from the real image state to the virtual image state through the optical lens module, the image is presented to the driver through an adjustable display panel. Adjustable The display panel can be changed according to the inclination angle of different windshield and the driving posture of different drivers to achieve the best viewing angle.

One aspect of the present invention provides a portable head-up display device including an image source, an optical path guiding module for receiving images, and an adjustable display panel. The optical path guiding module comprises a light diffusing plate and an optical lens module. The image source is used to provide an image. The light diffusing plate is spaced apart from the image source by a predetermined distance and includes a switchable high transmittance portion and a low transmittance portion. The light diffusing plate receives the image by the high transmittance portion or the low transmittance portion, and adjusts the brightness and contrast of one of the images according to the brightness change of one of the external ambient backlights. The optical lens module is spaced apart from the light diffusing plate by a predetermined distance for receiving an image transmitted through the light diffusing plate and converting the image from a real image state to a virtual image state. The adjustable display panel is configured to receive the image transmitted through the optical lens module, and display the image by tilting left and right or left and right according to the control.

In one embodiment, the distance between the light diffusing plate and the image source is between 1 and 5 cm, and the distance between the optical lens module and the light diffusing plate is between 9 and 13 cm.

In another embodiment, the portable head-up display device may further include a reflecting device for reflecting an image transmitted through the light diffusing plate. The image source can be a Digital Light Processing (DLP) micro projector, a Liquid Crystal On Silicon (LCOS) micro projector, a liquid crystal micro projector or a Scanned Laser. Projector. Further, at least one surface of the light diffusing plate forms a regular or irregular concavo-convex shape and includes at least one micromirror array. In addition, the optical lens module comprises a lens or a combination of two lenses or more.

Another aspect of the present invention provides a portable head mounted display The device includes a micro projector, an optical path guiding module for receiving images, and an adjustable display panel. The optical path guiding module comprises a frosted glass, a reflecting device and an optical lens module. The micro projector is used to project an image. The frosted glass is at a predetermined distance from the micro projector and includes a switchable high transmittance portion and a low transmittance portion. The frosted glass receives the image by the high transmittance portion or the low transmittance portion, and adjusts the brightness and contrast of the image with the change of the brightness of the external environment background light. The reflecting means is spaced from the frosted glass by a predetermined distance for reflecting the image transmitted through the frosted glass. The optical lens module is spaced apart from the reflecting device by a predetermined distance for receiving an image reflected by the reflecting device and converting the image from a real image state to a virtual image state. The adjustable display panel receives the image transmitted through the optical lens module, and displays the image by tilting left and right or left and right according to the control.

In one embodiment, the distance between the frosted glass and the microprojector is between 1 and 5 cm, the distance between the reflecting device and the frosted glass is between 3 and 7 cm, and the distance between the optical lens module and the reflecting device is between 3 and 7 cm.

In another embodiment, the microprojector can be a digital optical processing micro projector, a silicon based liquid crystal micro projector, a liquid crystal micro projector or a scanning laser projector. The micro projector may include a wired receiving module or a wireless receiving module for receiving a message and projecting the message.

In another embodiment, the frosted glass, the reflecting device, and the optical lens module may be made of glass or plastic. In addition, the reflecting device can be a mirror, a beam splitter, a polarizing beam splitter, a prism or a holographic optic. In addition, the optical lens module may comprise a lens or a combination of two lenses, and the lens may be selected from a lenticular lens, a double concave lens, a plano-convex lens, and a plano-concave lens. A holographic image, a planar mirror, a diffractive optic or a Fresnel lens, or any combination of any two or more.

In still another embodiment, the adjustable display panel is a transparent plastic flat plate or a transparent glass flat plate and has a thickness of 1 mm or less. In addition, the portable head-up display device further includes a beam splitter and another adjustable display. The beam splitter splits the image transmitted through the optical lens module into two, wherein a virtual image is displayed through an adjustable display. An image is rendered through another adjustable display.

100‧‧‧Portable head-up display

101‧‧‧Micro Projector

101a‧‧‧ receiving module

102‧‧‧Light diffuser

102a‧‧‧ concave shape

102b‧‧‧High penetration rate department

102c‧‧‧low penetration rate

103‧‧‧Reflecting device

S‧‧‧virtual image

104‧‧‧Optical lens module

105‧‧‧Adjustable display panel

106‧‧‧Light path guidance module

107‧‧‧ shaft

108‧‧‧Light reflection sheet

109‧‧‧Splitters

110‧‧‧Adjustable display panel

200‧‧‧ windshield

FIG. 1 is a schematic diagram showing a state of use of a portable head-up display device according to an embodiment of the invention.

FIG. 2 is a schematic diagram showing the imaging principle of the portable head-up display device according to an embodiment of the invention.

FIG. 3 is a schematic diagram showing the appearance of a portable head-up display device according to an embodiment of the invention.

Figure 4 is a diagram showing the arrangement of optical components in the optical path guiding module according to Figure 3.

FIG. 5 is a schematic view showing an embodiment of the light diffusing plate of the present invention.

FIG. 6 is a schematic diagram showing a combination of one of the portable head-up display devices.

FIG. 7 is a schematic diagram showing another combination of the portable head-up display devices.

FIG. 8 is a schematic view showing another application mode of the portable head-up display device of the present invention.

The operation of the various embodiments of the present invention will be described in the following. For the sake of clarity, a number of practical details will be described in the description. However, it should be understood that these practical details are not intended to limit the invention. That is, in some embodiments of the invention, these practical details are not necessary. In addition, some of the conventional structures and elements are shown in the drawings in a simplified schematic manner in order to simplify the drawings.

Please refer to FIG. 1 . FIG. 1 is a schematic diagram showing the use state of the portable head-up display device 100 according to an embodiment of the invention. The portable head-up display device 100 has the characteristics of being small, portable, and easy to install. In the automobile driving environment of Fig. 1, the portable head-up display device 100 is installed in a modular and easy-to-detach manner between the windshield 200 and the driver. The portable head-up display device 100 can change the set position to obtain an optimum viewing angle in accordance with the driver's usage habits, the size of the body, and the position of the equipment in the vehicle. Moreover, the portable head-up display device 100 further includes an adjustable display panel 105. The adjustable display panel 105 can be tilted back and forth to match different tilt angles of the windshield 200 of different models, and can be rotated left and right to match the driving postures of different drivers.

Please refer to FIG. 2 . FIG. 2 is a schematic diagram showing the imaging principle of the portable head-up display device 100 according to an embodiment of the invention. In the portable head-up display device 100, the image source uses a micro-projector 101, and the image projected by the micro-projector 101 is a real image. After passing through an optical component disposed in an optical path guiding module 106, the real image will be Converted into a virtual image S. Optical path guiding mode The group 106 is provided with a freely rotatable adjustable display panel 105 for allowing the virtual image S to be presented to the driver by the adjustable display panel 105. At this time, the driver's line of sight passes through the adjustable display panel 105, and a virtual image S is seen outside the windshield 200.

Please refer to FIG. 3 and FIG. 4 . FIG. 3 is a schematic diagram showing the appearance of the portable head-up display device 100 according to an embodiment of the present invention. FIG. 4 is a diagram showing the light path guiding module 106 according to FIG. 3 . Optical component setup diagram. The portable head-up display device 100 includes a micro-projector 101, an optical path guiding module 106, and an adjustable display panel 105.

The micro projector 101 serves as an image source. The micro projector 101 can be a digital optical processing micro projector, a silicon based liquid crystal micro projector, a liquid crystal micro projector or a scanning laser projector. The micro projector 101 includes a receiving module 101a that can receive a message and project the message. The receiving module 101a can be a wired receiving module or a wireless receiving module. Through the receiving module 101a, the micro projector 101 can be connected with a smart phone, a GPS navigation device, a portable computer, etc., and various types of messages can be projected out.

The optical path guiding module 106 receives the image projected by the micro projector 101, and has a plurality of optical elements disposed therein to project the image through the optical path guiding module 106. A light diffusing plate 102, a reflecting device 103 and an optical lens module 104 are disposed in the optical path guiding module 106. The optical path guiding module 106 is mainly designed to be modularized, and the optical components except the micro projector 101 and the adjustable display panel 105 are collected and assembled to achieve a small portable effect. In order to achieve the small portable effect, the distance between the light diffusing plate 102 and the micro projector 101 is between 1 and 5 cm, the distance between the reflecting device 103 and the light diffusing plate 102 is between 3 and 7 cm, and the optical lens module 104 and the opposite The distance of the launching device 103 is between 3 and 7 cm. By optimizing the design of the optical path, the optical path guiding module 106 can be miniaturized without detracting from the optical effect. On the other hand, errors such as chromatic aberration or distortion of the image can be eliminated by the optical lens module 104. The adjustable display panel 105 can be a transparent plate made of plastic or glass, which is not necessary to eliminate the color image. Poor use of a curved display panel can easily lead to situations such as aliasing or image shape distortion.

The arrangement of the light diffusing plate 102 makes the brightness distribution of the image projected by the micro projector 101 through the light diffusing plate 102 more uniform, and has the effect of increasing contrast and brightness. The light diffusing plate 102 has a switchable high transmittance portion 102b and a low transmittance portion 102c, so that different transmittances can be switched according to requirements, and the final image brightness can be adjusted with different external environment background brightness. Get the appropriate adjustments. At least one surface of the light diffusing plate 102 may form a regular or irregular concave-convex shape 102a. In one embodiment, the relief shape 102a is comprised of a micro mirror array. The light of the image projected by the micro projector 101 is scattered and redistributed by the uneven shape 102a after passing through the light diffusing plate 102 to make the brightness distribution more uniform, and the effects of optical refraction and reflection are formed through the uneven shape 102a. The light after redistribution is more concentrated, so it can increase the brightness and contrast of the image and reduce the influence of ambient light.

The reflecting device 103 changes the light path so that the image can be projected onto the optical lens module 104. The reflecting means 103 can use any optical element that can change the light path, such as a mirror, a beam splitter, a polarizing beam splitter, a prism or a holographic optic, and the like.

The optical lens module 104 includes at least one lens. The purpose is to receive an image reflected by the reflecting device 103 (in this case, a real image), and convert it into It is a virtual image S and is enlarged. The optical lens module 104 can use two or more lenses, and the lens can be a lenticular lens, a double concave lens, a plano-convex lens, a plano-concave lens, a holographic optical element, a plane mirror, a diffractive optic or a Fresnel lens. Any combination of the different lenses can be used to correct the chromatic aberration or distortion of the image so that the image can be clearly and correctly presented.

The adjustable display panel 105 receives the image transmitted by the optical path guiding module 106 for the purpose of changing the optical path and projecting the virtual image S presented by the optical lens module 104 in the optical path guiding module 106 to the driver. The adjustable display panel 105 can have various installation modes. In this embodiment, the rotating shaft 107 is mounted on the optical path guiding module 106, and has the functions of tilting forward and backward and rotating left and right. The adjustable display panel 105 can also be independently installed outside the optical path guiding module 106, thereby having various flexible configurations to meet different needs. The adjustable display panel 105 can be a transparent plastic flat plate or a transparent glass flat plate having a thickness of 1 mm or less, thereby avoiding the occurrence of ghosting and image distortion. The driver can see the virtual image S from the optical lens module 104 through the adjustable display panel 105. The virtual image S is displayed outside the windshield 200; therefore, the driver can observe the surrounding environment through the windshield 200. At the same time, I saw the important information such as the speed and gear position presented by the virtual image S, so as to have a comprehensive grasp of the driving situation. Moreover, since the adjustable display panel 105 can be tilted back and forth or left and right, the adjustable display panel 105 has higher degree of freedom in application, and can better match different driving postures of different drivers, compared with the conventionally tiltable setting. To achieve a better viewing angle.

The optical components in the optical path guiding module 106, such as the light diffusing plate 102, the reflecting device 103, the optical lens module 104, and the adjustable display The plate 105 can be made of glass or plastic. The use of plastic material can save costs, and it can help small and lightweight, and achieve better portability.

Referring to FIG. 5, FIG. 5 is a schematic view showing an embodiment of the light diffusing plate 102 of the present invention. In one embodiment of the light diffusing plate 102 of the present invention, a frosted glass is used. When the image light projected by the micro projector 101 passes through the irregular surface of the frosted glass, the original image will be broken up, and the light distribution and reflection caused by the undulation of the irregular surface will form a more uniform brightness distribution than the original image. And brightness and contrast images are higher. In this way, when the driver is surrounded by strong ambient light, a clear image can still be clearly seen. The frosted glass includes a switchable high transmittance portion 102b and a low transmittance portion 102c, which can switch different transmittances according to changes in brightness of the external ambient backlight, so that the brightness of the final image is appropriately adjusted.

Please refer to FIG. 6 and FIG. 7 . FIG. 6 is a schematic diagram showing a combination of the portable head-up display device 100 , and FIG. 7 is a schematic diagram showing another combination of the portable head-up display device 100 . In the sixth embodiment, the optical path guiding module 106 has a vertically elongated design. Therefore, the optical elements such as the light diffusing plate 102, the reflecting device 103, and the optical lens module 104 are arranged in a compact manner and extend in the vertical direction. .

In Fig. 7, in order to adapt to the space arrangement in different models, the optical path guiding module 106 is arranged in a lying manner, that is, the optical path guiding module 106 is relatively narrow in height, so in the optical path, an additional additional must be added. A light reflecting sheet 108 guides the light path to the correct position.

Please refer to FIG. 8 , which illustrates a schematic diagram of another application manner of the portable head-up display device 100 of the present invention. In Fig. 8, the image projected by the optical lens module 104 is first split by the beam splitter 109, and then separately Projected to the adjustable display panel 105 and another adjustable display panel 110. In this way, in addition to the driver can see the message, other passengers in the car can see the same message, so they can help the driver to pay attention to the surrounding environment and the condition of the car to ensure the safety of the ride.

In summary, the present invention provides a portable head-up display device 100. The portable head-up display device 100 has a compact size and a modular design, and can be installed in various forms in a vehicle, and has the convenience of installation. The light diffusing plate 102 of the portable head-up display device 100 uses frosted glass to make the brightness distribution of the image more uniform and the brightness contrast better, and is protected from the ambient light. Furthermore, the adjustable display panel 105 can be tilted back and forth or left and right, and the optimal viewing angle can be achieved according to different tilt angles of the windshield 200 and the posture of the driver.

100‧‧‧Portable head-up display

101‧‧‧Micro Projector

102‧‧‧Light diffuser

102a‧‧‧ concave shape

102b‧‧‧High penetration rate department

102c‧‧‧low penetration rate

103‧‧‧Reflecting device

104‧‧‧Optical lens module

105‧‧‧Adjustable display panel

106‧‧‧Light path guidance module

200‧‧‧ windshield

S‧‧‧virtual image

Claims (19)

The utility model relates to a portable head-up display device, which has a modular structure and can be disposed on an instrument panel of various vehicles. The portable head-up display device comprises: an image source for providing an image; The optical path guiding module for receiving the image comprises: a light diffusing plate for re-imaging the image, which is at a predetermined distance from the image source and includes a switchable high penetration a rate portion and a low transmittance portion, the light diffusion plate receives the image by the high transmittance portion or the low transmittance portion, and switches the high transmittance with a brightness change of an external ambient backlight a portion or the low transmittance portion to increase uniformity of brightness distribution of the image and to increase brightness and contrast of the image; and an optical lens module spaced apart from the light diffusion plate by a predetermined distance, the optical lens module The group is configured to receive the image transmitted through the light diffusing plate and convert the image from a real image state to a virtual image state; and an adjustable display panel for receiving the image through the optical lens module, and Control front and rear tilt or left and right rotation The image rendering. The portable head-up display device of claim 1, wherein the distance between the light diffusing plate and the image source is between 1 and 5 cm, and the distance between the optical lens module and the light diffusing plate is between 9 and 13 cm. . The portable head-up display device of claim 1, wherein the image source is a digital light processing (DLP) micro projector, and a liquid crystal on silicon (LCOS) micro-projection. Machine, a liquid crystal micro projector or a scanning laser (Scanned Laser) projector. The portable head-up display device of claim 1, further comprising a reflecting device for reflecting the image transmitted through the light diffusing plate. The portable head-up display device of claim 1, wherein the light diffusing plate comprises at least one micro-mirror array. The portable head-up display device of claim 1, wherein at least one surface of the light diffusing plate forms a regular or irregular concave-convex shape. The portable head-up display device of claim 1, wherein the optical lens module comprises a lens or a combination of two lenses or more. The utility model relates to a portable head-up display device, which has a modular structure and can be disposed on an instrument panel of various vehicles. The portable head-up display device comprises: a micro-projector for projecting an image; An optical path guiding module for receiving the image, comprising: a frosted glass for re-imaging the image, which is at a predetermined distance from the micro projector and includes a switchable high penetration a rate portion and a low transmittance portion, the frosted glass receives the image by the high transmittance portion or the low transmittance portion, and switches the brightness with a brightness change of an external ambient backlight The high transmittance portion or the low transmittance portion increases the uniformity of brightness distribution of the image and increases the brightness and contrast of the image; a reflecting device is spaced apart from the frosted glass by a predetermined distance, and the reflecting device reflects And the optical lens module is configured to receive the image reflected by the reflecting device and convert the image from a real image state; a virtual image state; and an adjustable display panel for receiving the image transmitted through the optical lens module, and displaying the image by tilting left and right or left and right according to the control. The portable head-up display device of claim 8, wherein the distance between the frosted glass and the micro projector is between 1 and 5 cm, and the distance between the reflecting device and the frosted glass is between 3 and 7 cm, the optical lens module The distance between the group and the reflecting device is between 3 and 7 cm. The portable head-up display device of claim 8, wherein the micro-projector is a digital optical processing micro projector, a silicon-based liquid crystal micro-projector, a liquid crystal micro-projector or a scanning laser projector. The portable head-up display device of claim 10, wherein the micro-projector comprises a receiving module for receiving a message and projecting the message. The portable head-up display device of claim 11, wherein the receiving module is a wired receiving module or a wireless receiving module. The portable head-up display device of claim 8, wherein the frosted glass, the reflecting device, and the optical lens module are made of glass or plastic. The portable head-up display device of claim 8, wherein the reflecting device is a mirror, a beam splitter, a polarizing beam splitter, a prism, or a holographic optical member. The portable head-up display device of claim 8, wherein the optical lens module comprises a lens, the lens is a lenticular lens, a double concave lens, a plano-convex lens or a plano-concave lens. The portable head-up display device of claim 8, wherein the optical lens module comprises at least two lenses selected from the group consisting of a lenticular lens, a double concave lens, a plano-convex lens, a plano-concave lens, and a holographic optical element. Any combination of a mirror, a diffractive optic or a Fresnel lens. The portable head-up display device of claim 8 further includes a beam splitter and another adjustable display, wherein the beam splitter splits the image through the optical lens module into two, one of the images being transmitted through the image The adjustable display is presented and the other image is presented through another of the adjustable displays. The portable head-up display device of claim 8, wherein the adjustable display panel is a transparent plastic plate or a transparent glass plate. The portable head-up display device of claim 8, wherein the adjustable display panel has a thickness of 1 mm or less.