JP6528965B2 - Head-up display device - Google Patents

Description

  The present invention relates to a head-up display device.

  2. Description of the Related Art Conventionally, a head-up display (Head-up display (Head) that displays vehicle information in front of a windshield or the like so that the driver of the vehicle can recognize vehicle information (speed, traveling distance, etc.) with little movement of eyes while driving. -Up Display (HUD) device has been proposed. The HUD device includes, for example, a display having a transmission type liquid crystal panel, and projects the display light representing the display image emitted by the display on a transmission / reflection unit such as a windshield to overlap the landscape to display a virtual image of the display image. Make the driver see it. In such a HUD device, when external light (mainly, sunlight) enters the display, the temperature of the liquid crystal panel rises, and the liquid crystal in the liquid crystal panel is blackened and becomes undisplayable. Could cause problems with the Also, in recent years, the HUD device has a wide angle of view and a so-called augmented reality (AR) display in which a virtual image is displayed superimposed on a specific object (such as a forward vehicle or a white line) in a landscape ahead of the vehicle. As far distance display is progressing, it is also necessary to reduce the volume of the HUD device, and the optical magnification (display / display unit) is high, and external light is easily condensed on the display, and liquid crystal by external light There is an increased risk of panel temperature rise.

  For such a problem, for example, in the cited reference 1, the intensity of light of a specific wavelength band transmitted through the transmission / reflection member that constitutes the optical system of the HUD device among the external light is detected, and the intensity is a predetermined threshold In the method, the backlight brightness is reduced or the backlight is turned off. In the cited reference 2, the brightness of the ambient light from the predetermined area is detected, and when the illuminance data for detecting the brightness of the ambient light becomes equal to or more than the predetermined value, the display light is projected to the projection member (transmissive reflection portion A method of pivoting the reflecting mirror to be projected to an angular position where external light is not reflected by the display.

JP, 2013-228442, A JP 2005-331624 A

  The methods disclosed in the cited documents 1 and 2 all execute a process of suppressing the temperature rise of the liquid crystal panel when the illuminance of the external light becomes equal to or more than a predetermined threshold value. However, since the temperature of the liquid crystal panel is affected by the illumination light from the light source as well as the external light, it is necessary to provide a certain margin in the threshold. That is, even when the temperature of the liquid crystal panel does not actually reach the temperature at which the blackening phenomenon occurs in the liquid crystal, the process of suppressing the temperature rise of the liquid crystal panel may be executed. In any of the processes for suppressing the temperature rise of the liquid crystal panel disclosed in the cited documents 1 and 2, the visibility of the display is lowered or not displayed, so that the display can be further improved by maintaining the display as much as possible. There was room.

  The present invention has been made in view of the above problems, and it is an object of the present invention to provide a head-up display device capable of maintaining the display as much as possible even when a defect of the display due to the incidence of external light occurs. To aim.

In order to solve the above problems, the head-up display device of the present invention includes a liquid crystal panel and a light source for irradiating the liquid crystal panel with illumination light from behind, and the display image is transmitted and displayed on the liquid crystal panel by the illumination light. A display for emitting display light indicating the display image from the liquid crystal panel;
A reflective member that reflects the display light toward a transmission reflective portion disposed in front of the viewer;
And a control unit for driving and controlling the display unit, a head-up display device external light that could be emitted to the display device,
It further comprises a state information acquisition unit for acquiring state information capable of estimating the state of the liquid crystal panel,
The control unit controls the display when it is determined that the liquid crystal panel has a blackening phenomenon based on the state information acquired by the state information acquisition unit, and the display area of the liquid crystal panel is displayed. And performing a first process of moving the display position of the display image in the peripheral direction more than that in the normal state.

  According to the present invention, it is possible to maintain the display as much as possible even in the case where a problem occurs in the display due to the incidence of external light.

It is a figure showing a schematic structure of a head up display device in an embodiment of the present invention. It is a figure which shows the liquid crystal panel of embodiment same as the above. It is a flowchart of defect avoidance processing of embodiment same as the above. It is a figure which shows the example of a display of the liquid crystal panel of embodiment same as the above. It is a figure which shows the mode of angle adjustment of the concave mirror in embodiment same as the above.

  Hereinafter, an embodiment of a head-up display (hereinafter, referred to as HUD) device of the present invention will be described based on the attached drawings.

First Embodiment
FIG. 1 is a view showing a schematic configuration of the HUD device 100 in the first embodiment. As shown in FIG. 1, the HUD device 100 is mounted on, for example, an automobile, and the display 11, the plane mirror 12, the concave mirror 13 (an example of a reflecting member), and the actuator 14 (external light irradiation avoidance unit, An example of the angle adjustment unit), a housing 15, an imaging unit 21, and a control unit 31 are included. The HUD device 100 reflects the display light L representing the display image M displayed on the display area DP by the display 11 by the plane mirror 12 and the concave mirror 13 and transmits the windshield (transmission reflection) of the vehicle 1 on which the HUD device 100 is mounted. An example of a part) By irradiating the light 1a, it is possible to make the virtual image V visible to the user. The eye box 2 indicates a viewpoint range in which the user can visually recognize the virtual image V. The contents displayed by the HUD device 100 in this manner are, for example, various types of vehicle information such as vehicle speed, navigation information for instructing a route, and the like.

  The display 11 is, for example, a transmissive type, and includes a liquid crystal panel 11a of a TFT (Thin Film Transistor) type and a light source 11b made of, for example, an LED (Light Emitting Diode) and emitting illumination light BL to the liquid crystal panel 11a. The display image M is transmitted and displayed on the display area DP of the liquid crystal panel 11a by the illumination light BL. The HUD device 100 generally generates a virtual display surface corresponding to the display area DP in the foreground of the user by reflecting the entire display area DP of the display 11 by the relay optical system (the plane mirror 12 and the concave mirror 13) Do. The display 11 displays the display image M in the display area DP, whereby the virtual image V based on the display image M is displayed on the virtual display surface.

  The plane mirror 12 has a reflection film formed on the surface of a base material made of, for example, a synthetic resin material by means of evaporation or the like, and directs the display light L of the display image M emitted by the display 11 to the concave mirror 13 It makes it reflect.

  The concave mirror 13 is formed by forming a reflection film on the surface of a base material made of, for example, a synthetic resin material by means such as evaporation, and further reflects the display light L reflected by the plane mirror 12 and emits it toward the windshield 1a. Do. The concave mirror 13 has a function as a magnifying glass, and enlarges the display image M displayed on the display 11 and reflects it to the windshield 1 a side. That is, the virtual image V visually recognized by the user is an image in which the display image M displayed in the display area DP of the display 11 is enlarged.

  The actuator 14 includes a motor (not shown), a power transmission member (not shown) such as a gear for transmitting the power of the motor to the concave mirror 13, and a support base for supporting the motor and the power transmission member and the concave mirror 13. The concave mirror 13 is rotated about the rotation axis AX. The actuator 14 generates motive power for rotating the concave mirror 13 around the rotation axis AX, and is made of, for example, a stepping motor. The actuator 14 rotates the concave mirror 13 about the rotation axis AX under the control of the control unit 31 described later. The actuator 14 adjusts the angle of the concave mirror 13 by rotating the concave mirror 13 to adjust the position of the eye box 2 or an angle at which the external light SL is not reflected by the concave mirror 13 toward the display 11 as described later. It is possible to adjust to

The housing 15 is composed of, for example, an upper case 151 and a lower case 152 which are formed of a black light-shielding synthetic resin, and by engaging the upper case 151 and the lower case 152, the plane mirror 12, the concave mirror 13, The actuator 14 and the imaging unit 21 are housed inside, and the control board on which the display 11 and the control unit 31 are mounted is attached to the outside.
The upper case 151 has an opening 151a for passing the display light L at a portion facing the windshield 1a, and the opening 151a is covered with a translucent cover 151b. Further, the upper case 151 has a light shielding wall 151c at a position close to the flat mirror 12 of the opening 151a, and the external light SL incident from the opening 151a (transparent cover 151b) is on the flat mirror 12 side or the display 11 side. Prevent progress to
The lower case 152 has a flat mirror 12, a concave mirror 13, an actuator 14, an imaging unit 21, an indicator 11 attached to the outside, and an engaging unit (not shown) for engaging a control board, which are housed inside the housing 15. Position and fix each member individually. Further, the lower case 152 has a display port 152 a opened such that the display image M displayed by the display 11 faces the plane mirror 12. Although an optical path through which the display light L passes is provided in the housing 15, these optical paths reduce the size of the HUD device 100 and the amount of external light SL intruding into the housing 15. It is desirable to make it as small as possible to reduce

  The imaging unit 21 is configured by a camera or the like, constantly images at least the first region DP1 and the second region DP2 in the display region DP of the liquid crystal panel 11a, and transmits the imaging pattern (captured image) to the control unit 31. Do. As shown in FIG. 2, the display area DP of the liquid crystal panel 11a is a first area DP1 in which the display image M is not always displayed, and a second in which the display image M is displayed around the first area DP1. A region DP2 and a third region DP3 located around the second region DP2 are provided. In the present embodiment, it is assumed that the first region DP1 is always in a black display state. Further, the temperature of the liquid crystal panel 11a tends to rise at the central portion, and the blackening phenomenon of the liquid crystal is also generated from the central portion and tends to expand toward the peripheral portion. Therefore, the first region DP1 is the center of the display region DP It is desirable to be provided in The imaging unit 21 is installed such that the imaging range 231 includes the first area DP1 and the second area DP2. In the present embodiment, the imaging range 231 of the imaging unit 21 substantially coincides with the second area DP2, and the first area DP1 and the second area DP2 are constantly imaged.

  The control unit 31 in FIG. 1 includes a microcomputer including a central processing unit (CPU) and a storage unit 31 a such as a ROM (Read Only Memory), a graphic display controller (GDC), an interface, and the like, and is mounted on a control board. . The control unit 31 transmits a vehicle speed, an engine rotational speed, etc. transmitted from an external device (not shown) such as a vehicle ECU (Electronic Control Unit) or a navigation device via a bus (not shown) such as CAN (Controller Area Network). It acquires various information such as vehicle information and navigation information, controls transmission and non-transmission of the liquid crystal panel 11a of the display 11 according to the information, and controls the light emission of the light source 11b to transmit and display the display image M . Further, the control unit 31 is connected to the imaging unit 21 and acquires an imaging pattern (captured image) as status information capable of estimating the status of the liquid crystal panel 11a, and accordingly, the transmission failure of the liquid crystal panel 11a of the display 11 The transmission is controlled and the actuator 14 is controlled to execute the "problem avoidance process" for avoiding the problem of the display 11 due to the temperature rise. That is, the control unit 31 has a function as a state information acquisition unit of the present invention. The “problem avoidance process” executed by the HUD device 100 will be described in detail later. The storage unit 31a stores a program for the control unit 31 to execute various calculations, a reference pattern (reference image), threshold data, and the like.

  The above is the configuration of the HUD device 100 in the present embodiment. Next, the “problem avoidance process” executed by the HUD device 100 according to the present embodiment will be described using FIG. 3.

  FIG. 3 is a flowchart of the “problem avoidance process” in the present embodiment. The “problem avoidance process” is started by turning on the control unit 31 with the ignition switch of the vehicle 1 turned on or the like.

  First, in step S1 of FIG. 3, the control unit 31 acquires from the imaging unit 21 an imaging pattern (captured image) obtained by imaging the first area DP1 and the second area DP2 of the display area DP, and stores them in advance. The first reference pattern (first reference image) stored in the unit 31a is read out. Note that, at the time of imaging, the control unit 31 controls the light source 11b to output the illumination light BL at a predetermined luminance. Here, the first reference pattern is an imaging pattern indicating the first region DP in the case where no abnormality such as a blackening phenomenon has occurred in the liquid crystal panel 11a, and for example, the imaging unit 21 at the time of manufacturing the HUD device 100. An image pattern obtained by imaging the first area DP is stored in advance in the storage unit 31a as a first reference pattern.

  Next, in step S2, the control unit 31 acquires the lightness of the portion indicating the first area DP1 in the imaging pattern acquired in step S1 by known image analysis or the like, and selects the first area DP1 in the imaging pattern. It is determined whether or not the lightness difference between the lightness of the portion shown and the lightness of the read first reference pattern is equal to or greater than the threshold X stored in advance in the storage unit 31a. When the blackening phenomenon actually occurs in the liquid crystal of the liquid crystal panel 11a, the light transmittance of the portion where the blackening phenomenon occurs is lower than that in the normal state where the blackening phenomenon does not occur, and the lightness of the imaging pattern is lowered ( Get dark). Therefore, when it is determined that the lightness difference between the portion indicating the first region DP1 in the imaging pattern and the first reference pattern is equal to or larger than the threshold X stored in advance in the storage unit 31a (Yes in step S2), Since it is estimated that the blackening phenomenon actually occurs in the first region DP1 of the liquid crystal panel 11a, the control unit 31 proceeds to step S3. In addition, when it is determined that the lightness difference between the portion indicating the first region DP1 and the first reference pattern in the imaging pattern is less than the threshold X (No in step S2), the first region of the liquid crystal panel 11a Since it is estimated that the blackening phenomenon does not actually occur in DP1, the control unit 31 proceeds to step S12. The threshold X is, for example, the first area DP1 when the light source 11b has the maximum luminance and the first area DP1 when the light source 11b has the minimum luminance in order to accurately determine the blackening phenomenon of the liquid crystal. A value larger than the difference with the lightness of is set.

  In step S3, the control unit 31 normally determines whether the position of the display image M displayed in the second area DP2 is the third area DP3. The control unit 31 proceeds to step S5. When it is determined that the position of the display image M is not the third area DP3 (No in step S3), it is determined that the movement of the display image M is not performed, and the control unit 31 proceeds to step S4. When it is determined that the position of the display image M is the third area DP3 (Yes in step S3), the position of the display image M is already moved from the second area DP2 to the third area DP3 at the normal time. Since it is determined that the display is in progress (it is determined that the second region DP2 is in the black display state), the control unit 31 shifts to step S5.

  In step S4, the control unit 31 normally changes the position of the display image M displayed in the second area DP2 to a third area DP3 in the more peripheral direction. FIG. 4A shows a state in which the display image M at the normal time is displayed in the second area DP2, and the vehicle speed and the traveling distance are displayed as the display image M in the second area DP2. In FIG. 4, background portions other than the display image M of the display area DP including the first area DP1 shown by hatching are assumed to be displayed in black. "Displayed in the second area DP2" means that a part of the display image M is displayed in the second area DP2 (for example, displayed across the second area DP2 and the third area DP3) Also includes). FIG. 4B shows a state in which the position of the display image M is changed to the third area DP3 in step S4, and the vehicle speed and the travel distance of the display image M are in the third area DP3 (in the peripheral direction ) Is moved and displayed. After execution of step S4, the control unit 31 proceeds to step S11.

  In step S5, the control unit 31 acquires, from the imaging unit 21, an imaging pattern obtained by imaging the first area DP1 and the second area DP2 of the display area DP, and further stores in advance a second image stored in the storage unit 31a. The reference pattern (second reference image) is read out. Here, the second reference pattern is an imaging pattern indicating the first area DP and the second area DP2 when no abnormality occurs in the liquid crystal panel 11a and the display image M is not displayed. For example, when the HUD device 100 is manufactured, an image pattern obtained by imaging the first area DP and the second area DP2 in which the display image M is not displayed at the time of manufacture of the HUD device 100 is used as a second reference pattern in the storage unit 31a. Pre-store.

  Next, in step S6, the control unit 31 acquires the lightness of the imaging pattern acquired in step S4 by known image analysis or the like, and among the imaging pattern, the lightness of the imaging pattern and the lightness of the read second reference pattern. It is determined whether the area | region whose brightness difference is more than the threshold value X previously memorize | stored in the memory | storage part 31a is predetermined size. Specifically, for example, among the coordinates set in the imaging pattern, an area in which the lightness difference is generated is specified from the coordinates where the difference between the lightness and the lightness of the corresponding coordinates of the second reference pattern is equal to or larger than the threshold X And calculate its size. When it is determined that the area of the imaging pattern whose lightness difference with the first reference pattern is equal to or more than the threshold X is equal to or more than a predetermined size (Yes in step S6), the blackening phenomenon of the liquid crystal panel 11a is the third The control unit 31 proceeds to step S7 because it is estimated that the region DP3 has been expanded to the vicinity of the region DP3. In addition, when it is determined that the area in which the lightness difference with the second reference pattern is equal to or larger than the threshold X in the imaging pattern is less than the predetermined size (No in step S6), the blackening phenomenon of the liquid crystal panel 11a is Since it is estimated that the region near the third region DP3 is not expanded, the control unit 31 proceeds to step S13. The predetermined size is set to an arbitrary size in consideration of the size of the second region DP2.

  In step S7, the control unit 31 controls the display 11 to display a predetermined notification image notifying that the display is to be stopped in the third region DP3 of the display region DP for a predetermined time. As an example of the notification image, the characters "Stop display due to high temperature of display" are displayed. The display time of the notification image is arbitrarily set.

  Next, in step S8, the control unit 31 controls the display 11 to stop the display. Specifically, the display image M is not displayed on the liquid crystal panel 11a, and the light emission of the light source 11b is stopped. Since the illumination light BL from the light source 11b is also a factor to raise the temperature of the liquid crystal panel 11a, the temperature rise of the liquid crystal panel 11a is suppressed by stopping the light emission of the light source 11b.

  Next, in step S9, the control unit 31 stores the current angle of the concave mirror 13 in the storage unit 31a, and then controls the actuator 14 to prevent the outside light SL from being irradiated to the display 11 Execute the process of Specifically, the control unit 31 controls the actuator 14 so that the external light SL is directed by the concave mirror 13 toward the display 11 (liquid crystal panel 11a) by the concave mirror 13 as shown in FIG. A process of adjusting to an angle not reflected (hereinafter referred to as non-display angle) is performed. As a result, the outside light SL is not irradiated to the liquid crystal panel 11a, and it is considered that the temperature of the liquid crystal panel 11a drops. The blackening phenomenon of the liquid crystal is improved along with the temperature decrease of the liquid crystal panel 11a in a short time. On the other hand, when the concave mirror 13 is at the non-display angle, the concave mirror 13 does not reflect the display light L toward the windshield 1a, so that the virtual image V can not be displayed (non-display state). After execution of step S9, the control unit 31 proceeds to step S10 after a predetermined time has elapsed.

  In step S10, the control unit 31 acquires from the imaging unit 21 an imaging pattern obtained by imaging the first area DP1 and the second area DP2 of the display area DP, and further stores in advance the first image stored in the storage unit 31a. Read out the reference pattern. At the time of imaging, the control unit 31 controls the light source 11b to output the illumination light BL at a predetermined luminance.

  Next, in step S11, the control unit 31 acquires the lightness of the portion indicating the first area DP1 in the imaging pattern acquired in step S10 by known image analysis or the like, and selects the first area DP1 in the imaging pattern. It is determined whether or not the lightness difference between the lightness of the portion shown and the lightness of the read first reference pattern is equal to or greater than the threshold X stored in advance in the storage unit 31a. When it is determined that the lightness difference between the portion indicating the first region DP1 and the first reference pattern in the imaging pattern is equal to or greater than the threshold X stored in advance in the storage unit 31a (Yes in step S11), the liquid crystal panel Since it is estimated that the blackening phenomenon that has occurred in the first area DP1 of 11a is not improved, the control unit 31 returns to step S10 and acquires the imaging pattern again. In addition, when it is determined that the lightness difference between the portion indicating the first region DP1 and the first reference pattern in the imaging pattern is less than the threshold X (No in step S11), the first region of the liquid crystal panel 11a Since it is estimated that the blackening phenomenon which arose in DP1 improved, control part 31 shifts to Step S13.

  In step S12, the control unit 31 sets the position of the display image M as the second region DP2 at the normal time (see FIG. 4A). After execution of step S12, the control unit 31 proceeds to step S13.

  In step S13, the control unit 31 controls the actuator 14 to adjust the concave mirror 13 to an angle (hereinafter referred to as a display angle) at which the display light L is reflected toward the windshield 1a and the virtual image V can be displayed. Execute the process of After executing step S13, the control unit 31 proceeds to step S12. The display angle is an initial value stored in advance in the storage unit 31a or an angle adjusted by the user as desired or stored in the storage unit 31a in step S9.

  In step S14, the control unit 31 controls the display 11, and causes the display region DP to display a predetermined display image M based on the display position determined in step S4 or step S12.

  The control unit 31 repeatedly executes the above-described processing until the power supply is shut off by turning off the ignition switch of the vehicle 1 or the like. When the power is shut off, the controller 31 preferably controls the actuator 14 to adjust the concave mirror 13 to the non-display angle. This is to prevent external light SL from being emitted to the display 11 when the vehicle 1 is stopped, thereby preventing a problem. When the HUD device 100 determines from the imaging pattern that the blackening phenomenon has actually occurred in the first area DP1 which is the central area of the liquid crystal panel 11a, the display image is first displayed by the first process. The display of the virtual image V is maintained by moving the position of M in the peripheral direction where the blackening phenomenon has not occurred yet. Then, if it is determined that the area where the blackening phenomenon occurs is expanding in the peripheral direction, the second process avoids the irradiation of the external light SL to the display 11, and suppresses the temperature rise of the liquid crystal panel 11a. Improve the blackening phenomenon. Then, if it is determined that the blackening phenomenon of the liquid crystal panel 11a is improved after the second processing, the irradiation avoidance of the external light SL to the display 11 is canceled by the third processing, and the virtual image V is displayed again Let

As described above, the HUD device 100 according to this embodiment includes the liquid crystal panel 11a and the light source 11b that irradiates the liquid crystal panel 11a with the illumination light BL from behind, and transmits the display image M to the liquid crystal panel 11a by the illumination light BL. A display 11 for displaying and emitting display light L indicating a display image M from the liquid crystal panel 11a; and a concave mirror 13 for reflecting the display light L toward a windshield 1a disposed in front of a viewer (user); A head-up display device including a control unit 31 that drives and controls the display unit 11, the state information acquisition unit (control unit 31) acquiring state information (imaging pattern) capable of estimating the state of the liquid crystal panel 11a; The control unit 31 is further determined based on the state information acquired by the state information acquisition unit that the liquid crystal panel 11a has a blackening phenomenon. The case, controls the display unit 11, executes a first process of the display position of the display image M in the display region DP of the liquid crystal panel 11a moves normally around direction than during.
The display area DP includes a first area DP1 in which the display image M is not always displayed, a second area DP2 located around the first area DP1, and a third area located around the second area DP2. Of the display area DP including at least the first area DP1 of the display area DP, and a first reference image showing the first area DP1 in which no abnormality occurs in the liquid crystal panel 11a. A storage unit 31a for storing a first reference pattern), the status information acquisition unit acquires a captured image captured by the imaging unit 21 as the status information, and the control unit 31 acquires the status information The captured image acquired by the unit is compared with the first reference image stored in the storage unit 31a, and the brightness of the portion of the captured image indicating the first area DP1 and the first reference image The difference is less than or equal to the predetermined threshold X If it is determined that the liquid crystal panel 11a is determined to be black, it is determined that the liquid crystal panel 11a has a blackening phenomenon, and the display 11a is controlled to display the display image M displayed in the second region DP2 at the normal time as the first process. Are moved to the third area.

  Thus, when it is determined that the blackening phenomenon has occurred in the liquid crystal panel 11a, the HUD device 100 first executes the first process of moving the display in the peripheral direction in which the blackening phenomenon does not easily occur. Even when a defect of the display 11 occurs due to the incidence of the outside light SL, the display of the virtual image V can be maintained as much as possible.

Further, the HUD device 100 further includes an external light irradiation avoidance unit (actuator 14) for avoiding the irradiation of the external light SL to the display 11, and the control unit 31 controls the state information after the execution of the first process. When it is determined that the area where the blackening phenomenon is occurring in the liquid crystal panel 11a is greater than or equal to a predetermined size based on the above, the outside light irradiation avoidance unit is controlled to irradiate the outside light SL to the display 11. Execute a second process that avoids
Further, the imaging unit 21 images at least a part of the first area DP1 and the second area DP2, and the storage unit 31a does not generate an abnormality in the liquid crystal panel 11a, and the display image M is not displayed. A second reference image (second reference pattern) indicating at least a part of the first area DP1 and the second area DP2 is stored, and the control unit 31 controls the imaging unit 21 to execute the first process. The captured image thus captured is compared with the second reference image stored in the storage unit 31a, and an area of the captured image having a lightness difference with the second reference image of not less than the threshold X is a predetermined value. If it is determined that the size is greater than the size, it is determined that the area where the blackening phenomenon occurs in the liquid crystal panel 11a is greater than the size, and the second process is performed.
The HUD device 100 further includes an actuator 14 that adjusts the angle of the concave mirror 13 as the outside light irradiation avoidance unit, and the control unit 31 controls the actuator 14 as the second process to set the concave mirror 13 to external light SL. The angle is adjusted so as not to be reflected toward the display 11.

  According to this, when the area where the blackening phenomenon occurs in the liquid crystal panel 11a is expanded, the second process for suppressing the temperature rise of the liquid crystal panel 11a is performed to promote the improvement of the blackening phenomenon. The failure of the display 11 can be avoided.

Further, in the HUD device 100, when executing the second process, the control unit 31 controls the display 11 to display notification information notifying that the display image M is stopped.
According to this, the user can grasp display stop in advance, and it is possible to reduce the discomfort due to the display stop.

The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications (including deletion of components) can be made without departing from the scope of the invention. In the present embodiment, the control unit 31 acquires an imaging pattern in which the imaging unit 21 images the first area DP and the second area DP2 as state information capable of estimating the state of the display area DP of the liquid crystal panel 11a. But it is not limited to this. In addition to this, the control unit 31 receives temperature information indicating the ambient temperature of the display 11 from the temperature sensor installed in the housing 15 and / or from the illuminance sensor installed near the opening 151 a of the housing 15. The illuminance information indicating the illuminance of the external light SL directed to the housing 15 is acquired as status information capable of estimating the status of the liquid crystal panel 11a, and whether the blackening phenomenon occurs in the liquid crystal panel 11a by temperature information and / or illuminance information Alternatively, it may be determined whether the area where the blackening phenomenon occurs in the liquid crystal panel 11 is a predetermined size or more. Specifically, for example, the control unit 31 estimates the temperature value of the liquid crystal panel 11a based on the temperature information, estimates the temperature increase value by the external light SL from the illuminance information, and determines the temperature value to the estimated temperature value. A rising value is added to calculate a predicted temperature value of the liquid crystal panel 11a, and when the predicted temperature value becomes equal to or more than a predetermined first threshold, a blackening phenomenon occurs in (the first region DP1 of) the liquid crystal panel 11a. It is determined that the area has a second threshold larger than the first threshold, it is determined that the area where the blackening phenomenon occurs in the liquid crystal panel 11a has a predetermined size or more.
Further, in the present embodiment, the actuator 14 for adjusting the angle of the concave mirror 13 is provided as the external light irradiation avoidance unit, but the position of the light shielding shutter (light shielding member) is moved or You may provide the actuator (position adjustment part) controlled by extension etc. In this case, the control unit 31 performs, as the second process, a position where the shutter is directed to the display 11 to block the external light SL (for example, the optical path of the display light L reaching the opening 15 a of the case 15 from the display 11) Execute the adjustment process. Further, in the present embodiment, the actuator 14 adjusts the angle of the concave mirror 13 as a reflection member, but the angle of the plane mirror 12 may be adjusted.

  The present invention is suitable for a head-up display device.

1 Vehicle 1a Windshield (Transparent Reflector)
DESCRIPTION OF SYMBOLS 2 eye box 11 indicator 11a liquid crystal panel 11b light source 12 plane mirror 13 concave mirror (reflection member)
14 Actuator (external light irradiation avoidance unit, angle adjustment unit)
Reference Signs List 15 housing 21 imaging unit 31 control unit 31a storage unit 100 head-up display device DP display area DP1 first area DP2 second area DP3 third area BL illumination light L display light M display image V virtual image

Claims (7)

A liquid crystal panel and a light source for irradiating the liquid crystal panel with illumination light from behind, a display image is transmitted and displayed on the liquid crystal panel by the illumination light, and a display for emitting display light showing the display image from the liquid crystal panel And the
A reflective member that reflects the display light toward a transmission reflective portion disposed in front of the viewer;
And a control unit for driving and controlling the display unit, a head-up display device external light that could be emitted to the display device,
It further comprises a state information acquisition unit for acquiring state information capable of estimating the state of the liquid crystal panel,
The control unit controls the display when it is determined that the liquid crystal panel has a blackening phenomenon based on the state information acquired by the state information acquisition unit, and the display area of the liquid crystal panel is displayed. Performing a first process of moving the display position of the display image in the peripheral direction more than usual. It further comprises an external light irradiation avoidance unit for avoiding the irradiation of the external light to the display,
When it is determined that the area where the blackening phenomenon has occurred in the liquid crystal panel has become equal to or greater than a predetermined size based on the state information after the execution of the first process, the control unit performs the external light The head-up display device according to claim 1, characterized in that a second process is performed to control an irradiation avoiding unit and to prevent the outside light from being irradiated to the display. The display area includes a first area where the display image is not always displayed, a second area located around the first area, and a third area located around the second area. Including
An imaging unit configured to image at least the first area of the display area;
And a storage unit storing a first reference image indicating the first area in which no abnormality occurs in the liquid crystal panel,
The state information acquisition unit acquires, as the state information, a captured image captured by the imaging unit,
The control unit compares the captured image acquired by the state information acquisition unit with the first reference image stored in the storage unit, and a portion indicating the first region in the captured image When it is determined that the difference in lightness with the first reference image is equal to or greater than a predetermined threshold value, it is determined that the liquid crystal panel has a blackening phenomenon, the display is controlled, and the first process is performed. The head-up display device according to claim 1, wherein the display image displayed in the second area at a normal time is moved to the third area. It further comprises an external light irradiation avoidance unit for avoiding the irradiation of the external light to the display,
The imaging unit captures at least a part of the first area and the second area,
The storage unit stores a second reference image indicating at least a part of the first area and the second area in which no abnormality occurs in the liquid crystal panel and the display image is not displayed.
The control unit compares the captured image captured by the imaging unit after the execution of the first process with the second reference image stored in the storage unit, and It is determined that the area where the blackening phenomenon occurs in the liquid crystal panel has become greater than or equal to the size when it is determined that the area where the lightness difference with reference image 2 is greater than or equal to the threshold is greater than the predetermined value. 4. The head-up display device according to claim 3, further comprising: a second process for controlling the outside light irradiation avoiding unit to avoid the outside light being irradiated to the display. .   The control unit, when executing the second process, controls the display unit to display notification information for notifying a display stop of the display image. Head-up display device according to claim 1. The external light irradiation avoidance unit includes an angle adjustment unit configured to adjust an angle of the reflection member,
The control unit controls the angle adjustment unit in the second process, and adjusts the reflection member to an angle at which the outside light is not reflected toward the display. Or the head up display apparatus of Claim 4. The external light irradiation avoidance unit includes a position adjustment unit that adjusts the position of the light shielding member,
5. The head-up display device according to claim 2, wherein the control unit adjusts the light blocking member to a position blocking the external light toward the display in the second process. .

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