JP2021081474A - Windshield display device - Google Patents

Abstract

To provide a WSD device for a vehicle capable of more reducing power consumption and a calorific value in narrow area display for performing image display on only a part of a display part than those in large screen display for performing the image display in a range wider than that in the narrow area display.SOLUTION: The windshield display device includes a scanner unit 13 which resonantly vibrates a mirror part around a resonant scanning axis and forcibly vibrates the mirror part around a forced scanning axis orthogonal to the resonant scanning axis, to scan laser light and projects a video to a display part, to form a display image, and a controller 14 which applies a driving voltage to the scanner unit 13, to resonantly vibrate the mirror part and forcibly vibrates the mirror part. The controller 14 controls the vibration range of a forced vibration by changing the driving voltage, performs switching between a large screen display mode for setting image display to large screen display and a narrow area display mode for setting the image display to narrow area display, and more reduces the output of the laser light projected by a laser light source in the narrow area display mode than that in the large screen display.SELECTED DRAWING: Figure 1

Description

The present invention relates to a windshield display (hereinafter referred to as WSD) device that displays an image projected from a projector on a display unit provided on a windshield on the front side of a vehicle.

Conventionally, there is a display device for a vehicle that displays an image on a display unit provided in a windshield as shown in Patent Document 1. In this vehicle display device, the display area of the augmented reality (hereinafter referred to as AR (Augmented Reality)) display mode and the display area of the general display mode of the AR-head-up display (hereinafter referred to as HUD) are different, and each display is different. Is being done. Specifically, the display area of the AR-display mode is almost the entire surface of the windshield of the vehicle, and the display area of the general display mode of the AR-HUD is a part of the windshield.

JP-A-2018-144690

In the above vehicle display device, a projector capable of projecting an image on almost the entire surface of the windshield corresponding to the AR-display mode is used, and only a part of the windshield is used in the general display mode of the AR-HUD. It will be projected. The same power is required when the image projected by the projector is reflected directly or by a mirror and displayed on the display section of the windshield, when the image is displayed on almost the entire display section or when the image is displayed on only a part of the display section. Then, the same heat generation occurs. This requires the same brightness as when displaying an image on almost the entire surface even when the image is displayed only on a part of the display unit, but in either case, the projector is driven by the same power. Because it becomes. In this way, even when the image is displayed only on a part of the display unit, the same power as when the image is displayed on almost the entire surface is required, and the same heat generation is generated, so that the efficiency is high. Absent.

In view of the above points, the present invention consumes less power in the case of a narrow area display in which an image is displayed only in a part of the display unit than in the case of a large screen display in which an image is displayed in a wider range. A first object of the present invention is to provide a WSD device for a vehicle that can reduce the amount of heat generated. A second object of the present invention is to provide a WSD device for a vehicle with improved efficiency by making it possible to increase the brightness in the case of a narrow area display as compared with the case of a large screen display.

In order to achieve the above object, the invention according to claim 1 projects an image onto a display unit (3) provided on a windshield (2) in a vehicle (V), and displays a display image on the display unit. A WSD device that makes it visible, has a laser light source (11) that projects a laser beam for generating an image, and a mirror unit (13a) that reflects the laser light, and the mirror unit has a resonance scanning axis (13b). ) A scanner unit (13) that scans the laser beam by causing it to resonate and vibrate around it and forcibly vibrate it around the forced scanning axis (13c) that is orthogonal to the resonant scanning axis, and projects an image onto the display unit to form a display image. It also has a controller (14) that causes the mirror portion to resonate and vibrate and forcibly vibrate by applying a drive voltage to the scanner unit. The controller controls the vibration range of forced vibration by changing the drive voltage, and displays a large screen with a wide range of drawing range on the display unit of the image projected by the scanner unit, and a large screen display mode. It switches to the narrow area display mode in which the drawing range on the display unit is narrower than the display, and the laser light projected by the laser light source is displayed in the narrow area display mode compared to the large screen display. Decrease output.

According to such a WSD device, it is possible to switch between a narrow area display and a large screen display by adjusting the drive voltage applied to the scanner unit to drive the mirror unit while using one scanner unit. Can be done. Then, when the narrow region display is performed, the desired brightness can be obtained even if the output of the laser light from the laser light source is reduced. Therefore, when the power consumption is reduced, the amount of heat generated can be reduced, and an efficient WSD device can be obtained. Further, in the case of the narrow area display, the amount of reduction in power consumption from the case of the large screen display can be reduced, or the power consumption can be prevented from being reduced. In that case, it is possible to increase the brightness in the case of the narrow area display as compared with the case of the large screen display, obtain high visibility, and improve the efficiency.

The reference reference numerals in parentheses attached to each component or the like indicate an example of the correspondence between the component or the like and the specific component or the like described in the embodiment described later.

It is a schematic diagram of the vehicle to which the WSD system which concerns on 1st Embodiment of this invention is applied. It is a figure which showed the state of the display on a WSD apparatus and a windshield. It is a figure which showed the applied voltage waveform at the time of performing a large screen display. It is a figure which showed an example of the applied voltage waveform at the time of performing a narrow region display. It is a figure which showed other example of the applied voltage waveform at the time of performing a narrow region display. It is a schematic diagram which showed the state of a large screen display. It is a schematic diagram which showed the state of the narrow region display. It is a block diagram which showed the detail of the control system of a WSD apparatus. It is a schematic diagram which showed an example of the display form at the time of narrow area display. It is a schematic diagram which showed an example of the display form at the time of performing a large screen display. It is a flowchart which showed the detail of the display control processing. It is a figure which showed the detail of the display part which can change the transmittance described in 2nd Embodiment. It is a schematic diagram which showed an example of the display form in the case where the narrow area display described in 3rd Embodiment is performed at the upper position and the lower position of the windshield. It is a figure which showed an example of the applied voltage waveform when the display of FIG. 9 is performed. It is a schematic diagram which showed the other example of the display form of the narrow area display described in another embodiment. It is a schematic diagram which showed the other example of the display form of the narrow area display described in another embodiment. It is a block diagram which showed the detail of the control system of the WSD apparatus described in another embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following embodiments, parts that are the same or equal to each other will be described with the same reference numerals.

(First Embodiment)
The WSD system to which the WSD apparatus according to the first embodiment is applied will be described. The WSD system is provided in the vehicle, and by projecting a display image on the display unit provided in the windshield, it can provide various information on vehicle driving to the occupants including the driver and display an entertainment display. provide.

In the WSD system shown in FIG. 1, for example, the display image can be visually recognized by the occupant by projecting the display image onto the display unit 3 of the windshield 2 from the WSD device 10 housed in the instrument panel 1 of the vehicle V. To do. The display unit 3 is configured by sandwiching the transparent screen film 3a with the laminated glass 2a and 2b constituting the windshield 2, for example. The range of the display unit 3 is arbitrary, but it is preferably the entire surface of the windshield 2. The windshield 2 provided with such a display unit 3 reflects the image projected from the WSD device 10 while having transparency through which external light is transmitted so that the driver can confirm the foreground of the vehicle V. It is visible to the driver.

As shown in FIG. 2, the WSD device 10 includes a laser scan module including a laser light source 11, a reflector 12, a scanner unit 13, a controller 14, and the like.

The laser light source 11 is composed of three laser projection units and the like, and by intermittently pulse-lighting the laser light from each laser projection unit, the laser light for generating the image of the display image of the display unit 3 is generated. Project. Each laser projection unit projects laser light having a different frequency, that is, a different hue. Specifically, each laser projection unit projects red, blue, and green laser beams, respectively. Then, in the laser light source 11, various colors can be reproduced by adding and mixing laser light having different hues, and laser light of a color expressing an image projected on the display unit 3 is generated and reflected. It is emitted to the mirror 12. The image projected by the laser light source 11 is determined based on the image data transmitted from the display control electronic control unit (hereinafter referred to as ECU) 20 which will be described later.

The reflector 12 reflects the laser beam emitted from the laser light source and guides it to the scanner unit 13.

The scanner unit 13 has a MEMS (Micro Electro Mechanical Systems) mirror unit 13a or the like, scans the laser beam reflected by the reflecting mirror 12, and projects the laser light toward the display unit 3, thereby displaying an image displayed on the display unit 3. To form.

The MEMS mirror unit 13a integrates a mirror, a piezoelectric element, and the like on a semiconductor substrate by microfabrication technology. For example, a mirror arranged in the center of the semiconductor substrate is formed into a piezoelectric element arranged on both sides thereof. The laser beam is scanned by driving based on the voltage application of. Specifically, the MEMS mirror unit 13a has a resonance scanning axis 13b as a horizontal rotation axis and a forced scanning axis 13c as a vertical rotation axis orthogonal to the resonance scanning axis 13b. Then, based on the voltage applied to the piezoelectric element, the mirror portion is resonated and vibrated around the resonant scanning shaft 13b, and is forced to vibrate around the forced scanning shaft 13c, so that the laser beam reflected by the MEMS mirror portion 13a is generated. The direction is scanned as shown in the scanning line SL shown in FIG. Although the piezoelectric drive type is used as an example of the MEMS mirror portion 13a here, it may be an electrostatic drive type or an electromagnetic drive type.

The controller 14 is composed of a processor or the like, and corresponds to a control unit that controls projection of laser light from the laser light source 11 and optical scanning by the scanner unit 13. The controller 14 controls the projection of laser light from each laser projection unit by transmitting a control signal to each laser projection unit of the laser light source 11.

Further, the controller 14 applies a voltage to the piezoelectric element in the scanner unit 13 to cause resonance vibration and forced vibration of the MEMS mirror unit 13a, scan the laser light projected by the laser light source 11, and guide the laser light to the display unit 3. , The display image is drawn on the display unit 3. Specifically, the controller 14 forcibly drives the MEMS mirror unit 13a by applying a triangular wave-shaped drive voltage to the piezoelectric element as a drive signal. Then, the controller 14 controls the vibration range of the forced vibration by changing the drive voltage, and displays the drawing range on the display unit 3 of the image projected by the WSD device 10 as a wide range and a narrow range. Switch between the case of displaying a narrow area and the case of displaying in a narrow area.

Specifically, when displaying a large screen, the controller 14 applies a triangular wave-shaped drive voltage having a predetermined amplitude as shown in FIG. 3A to display a wide range of the display unit 3 as shown in FIG. 4A. The laser beam is scanned. Further, in the case of performing the narrow region display, the controller 14 applies a triangular wave-shaped drive voltage having a smaller amplitude than that in the case of performing the large screen display shown by the alternate long and short dash line, as shown in FIG. 3B. As shown in 4B, the laser beam is scanned in a narrow range of the display unit 3.

Regarding the drive voltage waveform shown in FIG. 3B, the slope of the change in the drive voltage applied during the narrow region display is made gentler than that during the large screen display, and the frequency of the drive voltage is the same as that during the large screen display. However, the frequency can be changed as appropriate. For example, as shown in the drive voltage waveform shown in FIG. 3C, the slope of the change in the drive voltage applied during the narrow region display is the same as that during the large screen display, and the frequency of the drive voltage applied to the narrow region display is the large screen. It can also be set higher than when it is displayed. In the case of FIG. 3B, the forced vibration cycle of the mirror portion is the same as in the case of large screen display, and the display area can be reduced without changing the number of scanning lines. At this time, it is possible to draw using the same control method (signal format) as the large screen display, but it is necessary to consider that the aspect ratio per dot of the image to be drawn changes. In the case of FIG. 3C, since the slope of the change in the drive voltage is the same as in the case of the large screen display, the interval between the scanning lines is the same as in the case of the large screen display, and the image is displayed without changing the aspect ratio per dot. The area can be reduced. At this time, since the forced vibration cycle of the mirror portion is shorter than that in the case of large screen display, the frame rate can be increased and the image display can be performed more smoothly. However, in the case of large screen display and the signal format (frame). It is necessary to consider that the rate and the number of display pixels) are different. In both the method according to FIG. 3B and the method according to FIG. 3C, the display area can be reduced while keeping the laser beam output per unit time constant. Therefore, when the display brightness is required, the brightness can be improved at a reduced ratio by keeping the output of the laser light projected by the laser light source as it is. It is also possible to reduce the laser output during narrow area display so that the same brightness as when displaying on a large screen can be obtained. Therefore, the electric power of the laser light source 11 can be reduced and the amount of heat generated can be reduced.

By adjusting the voltage amplitude of the drive signal applied from the controller 14 to the MEMS mirror unit 13a in this way, it is possible to shift the amplitude and the amplitude center of the forced vibration of the mirror unit. As a result, the drawing range on the display unit 3 can be expanded or contracted in the vertical direction. Then, when the narrow region display is performed, the output of the laser beam can be reduced, so that the power consumption of the laser light source 11 can be reduced and the amount of heat generated can be reduced, so that the WSD device 10 is efficient. Is possible.

By using the WSD device 10 configured in this way and projecting an image onto the display unit 3 based on the switching of the position of the CLM 12, it is possible to perform both a narrow area display and a large screen display.

Next, the control system of the WSD device 10 in the WSD system will be described with reference to the block diagram shown in FIG.

As shown in FIG. 5, the WSD device 10 projects a display image on the display unit 3 based on various information transmitted from the display control ECU 20. The display control ECU 20 is capable of communicating with various ECUs 30 to 39 via an in-vehicle LAN (Local Area Network) 40, and relates to a display image projected by the WSD device 10 based on various information transmitted from various ECUs 30 to 39. Various information is generated. Specifically, various information from the high-precision positioning locator ECU 30, the navigation ECU 31, the driver monitor ECU 32, and the communication ECU 33 is input to the display control ECU 20. Further, various information from the vehicle information ECU 34, the peripheral monitoring ECU 35, the driving support ECU 36, the engine ECU 37, the audio ECU 38, the air conditioner ECU 39, and the like are also input to the display control ECU 20.

The locator ECU 30 for high-precision positioning is based on high-precision map information, a global positioning satellite system (GNSS) signal, a gyro sensor signal, a vehicle speed signal, an acceleration sensor signal, vehicle surrounding information detected by the peripheral monitoring ECU 35, and the like. The current position of is detected with high accuracy. Then, the high-precision positioning locator ECU 30 transmits the own vehicle position information, which is the information regarding the detected current position of the own vehicle, to the in-vehicle LAN 40.

The navigation ECU 31 acquires the vehicle position information from the high-precision positioning locator ECU 30, performs various processes using the navigation map information, and transmits the various information obtained by the processes to the in-vehicle LAN 40. For example, the navigation ECU 31 generates information on whether or not the current position of the own vehicle exists on the road as various processes, and calculates information on the guidance route from the current position of the own vehicle to the destination. , Generate route guidance information such as going straight or turning left or right.

The driver monitor ECU 32 controls a DSM (Driver Status Monitor) (not shown) to detect the driver status such as the position, orientation, and line-of-sight direction of the driver's face, and transmits the information to the in-vehicle LAN 40. For example, the DSM is composed of a near-infrared light source and a near-infrared camera provided in the vehicle interior, a control unit for controlling them, and the like. Then, the driver monitor ECU 32 irradiates the driver with near-infrared light from the near-infrared light source, captures the state with the near-infrared camera, and analyzes the captured image to determine the position of the driver's face. The direction and line-of-sight direction are detected.

The communication ECU 33 has a function of communicating with a device outside the vehicle by mobile communication, DSRC (Dedicated Short Range Communications), etc., and a function of communicating with a mobile terminal by Wi-Fi, Bluetooth (registered trademark), a USB cable, or the like. The communication ECU 33 transmits information from another ECU transmitted through the in-vehicle LAN 40 to a device or mobile terminal outside the vehicle, or receives various information from the device or mobile terminal outside the vehicle and transmits the information to the in-vehicle LAN 40. ing.

The vehicle information ECU 34 acquires information on various vehicle states and transmits the information to the in-vehicle LAN 40. Specifically, the vehicle information ECU 34 acquires information on the vehicle speed, the remaining fuel amount, the acceleration / deceleration, the steering angle, the yaw angle speed, the battery voltage value, and the states of various switches. Information on the state of the switch includes, for example, the state of the headlamp switch and the door lock switch. Further, the information on the state of the switch includes information on the state of the operation mode setting switch that sets whether the operation is driver-based or non-driver-based operation based on driving support control such as automatic operation. Further, as the information regarding the state of the switch, there is also information regarding the state of the display setting switch for setting the narrow area display and the large screen display and setting the display contents.

The peripheral monitoring ECU 35 acquires various information for monitoring the surrounding environment of the own vehicle, performs various processes, and transmits the necessary information to the in-vehicle LAN 40. For example, the peripheral monitoring ECU 35 is a stationary static target such as a moving dynamic target such as a pedestrian or another vehicle, a structure on a road, or a traveling lane, based on a detection result by a peripheral monitoring sensor (not shown). It detects an object around the vehicle such as a target and transmits the information to the in-vehicle LAN 40. Peripheral monitoring sensors include peripheral surveillance cameras that capture a predetermined range around the vehicle, millimeter-wave radar that transmits exploration waves to a predetermined range around the vehicle, sonar, and exploration wave sensors such as LIDAR (Light Detection and Ranging). Can be mentioned. The peripheral monitoring camera captures a peripheral image of the own vehicle and outputs the captured data as a detection result to the peripheral monitoring ECU 35. The exploration wave sensor outputs the exploration wave and sequentially outputs the detection results such as the relative velocity and distance to the target and the azimuth in which the target exists obtained by acquiring the reflected wave to the peripheral monitoring ECU 35. To do.

The driving support ECU 36 executes driving support control such as ACC (Adaptive Cruise Control) control and lane keep control. The driving support ECU 36 obtains various information related to the state of the driving support control and transmits it to the in-vehicle LAN 40.

The engine (E / G) -ECU 37 adjusts the drive torque by executing engine control. The engine ECU 37 acquires various information related to engine control such as engine speed, cooling water temperature, shift position, and hybrid drive control state, and transmits the information to the in-vehicle LAN 40.

The audio ECU 38 has a function of controlling radio, TV, CD / DVD, USB audio, etc., acquires AV information of each audio device, and transmits it to the in-vehicle LAN 40.

The air conditioner ECU 39 controls the room temperature, the amount of air blown, the switching of the air blowing mode, etc. by executing the air conditioner control, acquires various information related to the air conditioner control, and transmits the information to the in-vehicle LAN 40. ..

The display control ECU 20 acquires information related to image display on the display unit 3 from various information transmitted from various ECUs 30 to 39 to the in-vehicle LAN 40, and relates to an image to be projected by the WSD device 10 based on the acquired information. Generating information. In the case of the present embodiment, the display control ECU 20 has a plurality of output ports, and various information corresponding to different display contents is output to the WSD device 10 from each output port.

For example, when displaying various information about the vehicle by displaying an image on the display unit 3, the display control ECU 20 displays meter display information, HUD display information, center display image signal, and electronic mirror image on the display unit 3 on the WSD device 10. Communicate signals and other information as various types of information. Then, based on the various information, the WSD device 10 performs meter display, HUD display, center display image display, and electronic mirror image display.

As the meter display, for example, the display of the vehicle speed and the remaining amount of fuel based on the information on various vehicle states transmitted from the vehicle information ECU 34, and the display on the engine speed, the cooling water temperature, the shift position, and the hybrid drive control state transmitted from the engine ECU 37. Is done.

As the HUD display information, for example, display related to guidance route information and route guidance information transmitted from the navigation ECU 31, and display related to various targets such as pedestrians around the own vehicle transmitted from the peripheral monitoring ECU 35 are performed.

Examples of the center display image display include an air conditioner operation screen display, a navigation map screen display, and an audio operation screen display based on various information transmitted from the air conditioner ECU 39, the navigation ECU 31 and the audio ECU 38.

The electronic mirror image display is an image corresponding to the image of the vehicle right rear and the left rear projected by the side mirror based on the image data of the vehicle right rear and the left rear taken by the peripheral monitoring camera sent from the peripheral monitoring ECU 35. Is displayed.

In addition, since the communication ECU 33 can communicate with devices and mobile terminals outside the vehicle to acquire various information, information obtained from the outside of the vehicle, such as weather information and traffic information such as traffic jam / accident information, can be obtained. It is also possible to display an image of such vehicle external information. Further, as the information obtained from the outside of the vehicle, it is also possible to obtain image information for entertainment that is not related to the vehicle running and display an image of a movie, for example.

Each of these displays is displayed at a predetermined position in the display unit 3, for example, at the same position as when each unit is arranged on the instrument panel. For example, in the case of narrow area display, as shown in FIG. 6A, the portion surrounded by the alternate long and short dash line in the figure is set as the display range 100 of the narrow area display. Then, as shown by the broken line in the figure, the meter display 101 is displayed at the front position of the driver in the display unit 3, and the HUD display 102 is displayed at the upper position of the meter display 101. Further, the center display image display 103 is displayed at a position in front of the passenger seat from the center position, that is, at a position farther from the driver than the meter display 101 and the HUD display 102. Further, the electronic mirror image display 104 is displayed at the right end and the left end of the display unit.

On the other hand, in the case of a large screen display, for example, as shown in FIG. 6B, the portion surrounded by the alternate long and short dash line in the figure, that is, the entire surface of the windshield 2 is set as the display range 100 of the large screen display. Here, even in the case of a large screen display, each display similar to the narrow area display is performed at the lower position of the display unit 3, and other displays are performed at the remaining portion.

The display form of each of the narrow area display and the large screen display can be switched based on the setting on the display setting switch. For example, in the case of driver-based operation, narrow area display is performed, and if the driver is not driver-based operation and the driver selects the large screen display mode through the display setting switch, large screen display is performed. If the display content is set through the display setting switch, the display is performed based on the set display content. The display contents can be set in various ways. For example, a mode in which one or all of the meter display 101, the HUD display 102, the center display image display 103, and the electronic mirror image display 104 is selected, and these displays are displayed. The display can be different from the above. In that case, as shown in FIG. 6B, while displaying the meter display 101, the HUD display 102, the center display image display 103, and the electronic mirror image display 104, other displays set by the driver may be displayed in the remaining portion. , A form in which only other displays are performed may be used. In particular, when performing a large screen display in automatic operation, the driver may not necessarily visually recognize the meter display 101, the HUD display 102, the center display image display 103, and the electronic mirror image display 104. In such a case, the entertainment display can be performed on all of the large screen displays.

At this time, in both the large screen display and the narrow area display, the display control ECU 20 displays an image in the display unit 3 in consideration of the driver status such as the position, orientation, and line-of-sight direction of the driver's face from the driver monitor ECU 32. The position is decided. For example, the case where the driver's face position is at a predetermined height is set as the reference position, the image display position is set higher than the reference position for a person whose face position is higher than that, and the image display is performed for a person who is lower than that. The position is lower than the reference position. Further, the image display position may be adjusted according to the line-of-sight direction based on the face direction and the line-of-sight direction.

Next, the operation of the WSD system configured as described above will be described with reference to the flowchart of the display control process executed by the display control ECU 20 shown in FIG. 7. The display control process is executed at predetermined control cycles when the vehicle start switch such as the ignition switch is turned on.

First, as shown in step S100, the operation mode is acquired. This process is performed by acquiring information regarding the state of the operation mode setting switch transmitted from the vehicle information ECU 34.

Subsequently, the process proceeds to step S110, and it is determined whether or not the operation mode is a driver-based operation mode. Here, if the state of the operation mode setting switch is driver-based operation, a positive determination is made, and if the operation is not driver-based operation based on driving support control such as automatic operation, a negative determination is made.

Then, if an affirmative judgment is made in step S110, the process proceeds to step S120 to set the narrow area display mode. When the narrow area display mode is set, the display control ECU 20 informs the WSD device 10 that the narrow area display mode is set through the in-vehicle LAN 40. Further, the display content is acquired based on various information transmitted from the various ECUs 30 to 39 in step S130, and then the display is updated to the display content acquired in step S120 in step S140.

In this way, as shown in FIG. 6A, a narrow area display is performed using a part of the display unit 3 provided in the windshield 2. The display content at this time can be, for example, the display content set through the display setting switch, or the display content determined by law or the like to be displayed during traveling. The image display position is set in consideration of the driver's face position, orientation, line-of-sight direction, and other driver conditions. Further, when the narrow region display is performed, the drive voltage applied from the controller 14 to the MEMS mirror unit 13a is reduced as compared with the case where the large screen display is performed. As a result, the amount of forced vibration of the mirror unit in the MEMS mirror unit 13a is reduced, and the drawing range of the display image by the laser beam projected from the scanner unit 13 is reduced as compared with the case where the large screen display is performed. To. At this time, even if the output of the laser light from the laser light source 11 is reduced, the same brightness as in the case of large screen display can be obtained. Therefore, the electric power of the laser light source 11 can be reduced and the amount of heat generated can be reduced.

On the other hand, if a negative determination is made in step S110, the process proceeds to step S150 to determine whether or not the large screen display mode is set. Here, if the large screen display mode is set through the display setting switch, a positive determination is made, and if it is not set, a negative determination is made. Then, if a negative determination is made, the process proceeds to steps S120 to S140 to display the narrow area as described above, and if an affirmative determination is made, the process proceeds to step S160.

In step S160, the large screen display mode is set. When the large screen display mode is set, the display control ECU 20 informs the WSD device 10 that the large screen display mode is set through the in-vehicle LAN 40. Further, the display content is acquired based on various information transmitted from the various ECUs 30 to 39 in step S170, and then the display is updated to the display content acquired in step S170 in step S180.

In this way, as shown in FIG. 6B, a large screen display is performed using the entire surface of the display unit 3 provided in the windshield 2. The display content at this time is, for example, the display content set through the display setting switch. In addition, if there is a display content that should be displayed while driving, it is possible to display a large screen while including the display content. In that case, the display content determined by laws and regulations is displayed only at the position displayed when displaying a narrow area, and the remaining part of the display unit 3 is displayed through the display setting switch. It is good to display the contents. In this way, it is possible to see the display contents that the occupant wants to see in a larger display. For example, not only the display contents related to the vehicle running but also the display contents not related to the vehicle running such as the entertainment display can be displayed.

As described above, according to the WSD device 10 of the present embodiment, the narrow area display and the large screen display can be obtained by adjusting the drive voltage applied to the MEMS mirror unit 13a while using one scanner unit 13. Switching can be performed. Then, when the narrow region display is performed, even if the output of the laser light from the laser light source 11 is reduced, the same brightness as in the large screen display can be obtained. Therefore, the power of the laser light source can be reduced and the amount of heat generated can be reduced. Therefore, it is possible to obtain an efficient WSD device 10.

(Second Embodiment)
The second embodiment will be described. This embodiment is a modification of the configuration of the display unit 3 with respect to the first embodiment, and the other parts are the same as those of the first embodiment. Therefore, only the parts different from the first embodiment will be described.

In the first embodiment, the display unit 3 is provided on the entire surface of the windshield 2 so that a large screen display can be performed. However, in the vehicle, the windshield 2 is transparent so as not to interfere with the driver's driving. The rate must be high. However, when the transmittance is increased, the amount of scattered light is reduced, so that the efficiency of the screen is lowered, and as a result, the display becomes dark. It can be compensated by increasing the power consumption of the laser light source 11 as the display becomes darker, but there are problems that the power consumption of the laser light source 11 increases, the amount of heat generated accompanying the increase, and the number of heat-dissipating parts for solving the increase. Will let you. Therefore, it is desirable that the efficiency can be improved without increasing the power of the laser light source 11.

Therefore, in the present embodiment, as shown in FIG. 8, the display unit 3 has a laminated structure, and the transmittance of the laminated glass 2a and 2b constituting the windshield 2 can be changed in addition to the transparent screen film 3a. The structure is such that the variable rate film 3b is sandwiched between them. Specifically, the display unit 3 is formed by laminating the transparent screen film 3a on the vehicle interior side and the transmittance variable film 3b on the vehicle interior side of the transparent screen film 3a.

As the transmittance variable film 3b, for example, electrochromic or gas chromic can be used, and the transmittance can be changed based on the application of electric charge or the like.

Therefore, when the brightness of the image display is not sufficient when displaying a large screen, it is possible to make the image display easier for the occupant to see by applying an electric charge to reduce the transmittance. For example, when the power supply line is connected to the variable transmittance film 3b and the driver presses a variable transmittance operation switch (not shown), the transmittance can be changed, or when a large screen is displayed, the variable transmittance film is automatically applied. Control is performed to reduce the transmittance of 3b. As a result, the occupant can surely confirm the image display even when the large screen is displayed.

(Third Embodiment)
The third embodiment will be described. In this embodiment, the display range of the narrow area display is changed with respect to the first and second embodiments, and the other aspects are the same as those in the first and second embodiments. Therefore, the first and second embodiments are performed. Only the part different from the form will be described.

In the first and second embodiments, when the narrow area is displayed, the image is displayed at the lower position of the windshield 2, but in the present embodiment, the image is displayed at the lower position as shown in FIG. The image is displayed with the upper position as the display range 100. In this way, when displaying a narrow area, not only the image is displayed at the lower position of the windshield 2, but the image may be displayed at another position, or the image may be displayed at a plurality of places. Is also good.

In that case, for example, the drive voltage applied to the MEMS mirror unit 13a is made into the waveform shown in FIG. That is, regarding the amplitude of the drive voltage, the narrow region display is the same as the large screen display. Then, the inclination of the voltage change of the portion corresponding to the display of the upper position and the voltage change of the portion corresponding to the display of the lower position in the narrow area display is the same as that in the case of the large screen display, and the display unit 3 The voltage should be changed instantaneously in places where the narrow area display is not performed.

By using such a drive voltage waveform, it is possible to set the narrow region display to the lower position and the upper position of the windshield 2.

Here, a case has been described in which the slope of the voltage change in the portion of the drive voltage waveform in which the narrow region display is performed is the same as in the case of the large screen display. In this case, the same effect as in FIG. 3C described above can be obtained. On the other hand, the slope of the voltage change in the portion of the drive voltage waveform in which the narrow region display is performed may be made gentler than in the case of the large screen display. In this case, the same effect as in FIG. 3B described above can be obtained.

(Other embodiments)
Although the present disclosure has been described in accordance with the above-described embodiment, the present disclosure is not limited to the embodiment, and includes various modifications and modifications within an equal range. In addition, various combinations and forms, as well as other combinations and forms that include only one element, more, or less, are also within the scope of the present disclosure.

In each of the above embodiments, the narrow area display is reduced in the display range in the height direction of the vehicle with respect to the full screen display, but the method of reducing the display range of the narrow area display is arbitrary. For example, as shown in FIG. 11A, the display range 100b of the narrow area display may be reduced in three directions from the upper side and the left and right sides with respect to the display range 100a of the large screen display. That is, the lower end of the display range 100b of the narrow area display can be fixed, and the left and right end portions and the upper end can be moved by reducing the display range. The reduction of the display range 100b at the left and right ends of the narrow region display can be realized by reducing the amplitude of the resonance vibration with respect to each of the above embodiments. Further, as shown in FIG. 11B, the display range 100b of the narrow area display may be limited to the upper position of the display unit 3. Of course, the display range 100b of the narrow area display may be limited to other positions in the display unit 3, for example, the center position.

In any of these cases, the laser light projected from the scanner unit 13 can be concentrated in the display range 100b, which is narrower than that in the large screen display, so that the laser light output from the laser light source 11 can be output. High brightness can be obtained even if the value is lowered. Therefore, the power consumption of the laser light source 11 can be reduced, and the amount of heat generated can be reduced, so that the WSD device 10 can be made efficient.

Further, in each of the above embodiments, the case where the large screen display is performed using the entire surface of the windshield 2 has been described, but it is not always necessary to use the entire surface. Further, the use of the entire surface of the windshield 2 includes the case where the entire surface of the windshield 2 is almost the entire surface, and the entire surface of the windshield 2 may not be completely used.

Further, in each of the above embodiments, as shown in FIG. 5, the display control ECU 20 is provided with a plurality of output ports, and various information is separately output to the WSD device 10 by communication from each. .. This is because, depending on the grade of the vehicle V, etc., there is a case where only the display using the information output from a part of the plurality of output ports is performed. It is possible to correspond to the grade and to have versatility. However, this is only an example, and as shown in FIG. 12, the display control ECU 20 is provided with only one output port, and various information is transmitted to the WSD device 10 by serial communication in which a plurality of communications are combined. It may be in a form that can be used.

The controls and methods thereof described in the present disclosure are realized by a dedicated computer provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program. May be done. Alternatively, the controls and methods thereof described in the present disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the control unit and method thereof described in the present disclosure may be a combination of a processor and memory programmed to perform one or more functions and a processor composed of one or more hardware logic circuits. It may be realized by one or more dedicated computers configured. Further, the computer program may be stored in a computer-readable non-transitional tangible recording medium as an instruction executed by the computer.

2 Windshield 3 Display unit 3a Transparent screen film 10 WSD device 11 Laser light source 13 Scanner unit 13a Mirror unit 13b Resonant scanning axis 13c Forced scanning axis 14 Controller

Claims (9)

A windshield display device that projects an image onto a display unit (3) provided on a windshield (2) in a vehicle (V) so that the display image can be visually recognized on the display unit.
A laser light source (11) that projects a laser beam for generating the image, and
Having a mirror portion (13a) that reflects the laser beam, the mirror portion is resonantly vibrated around the resonant scanning axis (13b) and is forced to vibrate around the forced scanning axis (13c) orthogonal to the resonant scanning axis. The scanner unit (13) that scans the laser beam and projects the image onto the display unit to form the display image.
It has a controller (14) that causes the mirror unit to resonate and vibrate and forcibly vibrate by applying a drive voltage to the scanner unit.
The controller controls the vibration range of the forced vibration by changing the drive voltage, and displays a large screen with a wide range of drawing range of the image projected by the scanner unit on the display unit. , A windshield display device that switches between a narrow area display mode in which a drawing range on the display unit is narrower than the large screen display and a narrow area is displayed. The controller
By applying the driving voltage in a triangular wave shape having a predetermined period and a predetermined amplitude to the scanner unit, the mirror portion is forcibly vibrated around the forced scanning axis.
The windshield display device according to claim 1, wherein in the case of the narrow region display mode, the amplitude of the forced vibration is reduced by reducing the amplitude of the driving voltage as compared with the large screen display mode. The controller
The windshield display according to claim 2, wherein the period of the drive voltage in the narrow region display mode is the same as that of the large screen display mode, and the slope of the change of the drive voltage is made gentler than that of the large screen display mode. apparatus. The controller
The windshield display device according to claim 2, wherein the slope of the change in the drive voltage in the narrow region display mode is the same as that in the large screen display mode, and the cycle of the drive voltage is shorter than that in the large screen display mode. .. The windshield display device according to any one of claims 1 to 4, wherein when display brightness is required, the narrow area display mode is set and the display brightness is increased while keeping the output of the laser light projected by the laser light source as it is. The windshield display device according to any one of claims 1 to 5, wherein in the narrow area display mode, the output of the laser light projected by the laser light source is lower than in the case of the large screen display. The large screen display is a display using the entire surface of the windshield.
The windshield display device according to any one of claims 1 to 6, wherein the narrow area display is a display using a lower position of the windshield. The large screen display is a display using the entire surface of the windshield.
The windshield display device according to any one of claims 1 to 6, wherein the narrow area display is a display using the upper position and the lower position of the windshield. The windshield display device (10) according to any one of claims 1 to 8.
It has the display unit provided in the windshield, and has.
The display unit
A transparent screen film (3a) on which an image projected from the windshield display device is displayed, and
A windshield display system having a transmittance variable film (3b) which is arranged outside the vehicle interior and has a variable transmittance than the transparent screen film.

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