WO2012108031A1 - Display device, display method, and display program - Google Patents

Abstract

A display device comprises: a current position acquisition means for acquiring a current position; a map information storage means for storing map information; an illuminance acquisition means for acquiring external illuminance; and a control means for adjusting, according to the illuminance acquired by the illuminance acquisition means, the brightness of an image displayed on a display portion. Specifically, before a moving body enters a predetermined region where external illuminance changes, based on the current position and the map information, the control means varies the brightness of the image displayed on the display portion so that the brightness of the image becomes a predetermined brightness corresponding to the illuminance of the predetermined region. This makes it possible to prevent visibility deterioration such as, for example, the glare on the display portion felt when entering the predetermined region.

Description

Display device, display method, and display program

The present invention relates to a technical field regarding a display device used in a moving body such as a vehicle.

Conventionally, a display device called a head-up display (HUD) for displaying various information on a windshield of a vehicle is known. This type of technique is proposed in Patent Documents 1 and 2, for example. Japanese Patent Application Laid-Open No. H10-228707 recognizes the vehicle exterior state based on information obtained from a map database, a CCD camera, and an illuminance sensor, so that the display form of the HUD unit is not assimilated with respect to the recognized vehicle exterior state. A technique for changing the display form (display color and transparency) of the unit has been proposed. Patent Document 2 estimates the illuminance at the display position of the driving assistance information on the front window shield, and the illuminance detected by the illuminance sensor (the illuminance of light entering the vehicle through the front window shield) matches the estimated illuminance. When not doing, the technique which controls the display mode of driving assistance information based on the estimated illumination intensity is proposed.

Japanese Patent Laid-Open No. 10-311732 JP 2010-188826 A

In the techniques described in Patent Documents 1 and 2, basically, the luminance of the display unit is changed after the illuminance detected by the illuminance sensor changes (that is, when the illuminance of the outside world changes). It was. For this reason, for example, when the brightness of the display unit is changed when entering the tunnel or when exiting the tunnel, the visibility of the display unit may be deteriorated. For example, when entering the tunnel, the display is made dazzling until it changes to the brightness according to the illuminance inside the tunnel, or when changing from the tunnel, the brightness changed according to the illuminance outside the tunnel. Sometimes it made me feel dazzling.

Examples of the problem to be solved by the present invention include the above. It is an object of the present invention to provide a display device, a display method, and a display program that can set a display unit to an appropriate luminance in advance before the illuminance of the outside world changes.

In the first aspect of the present invention, the display device includes a current position acquisition unit that acquires a current position, a map information storage unit that stores map information, an illuminance acquisition unit that acquires illuminance of the outside world, and the illuminance acquisition unit. Control means for adjusting the brightness of an image to be displayed on the display unit according to the illuminance acquired by the control unit, the control means based on the current position acquired by the current position acquisition means and the map information. Before the moving body enters the predetermined area where the illuminance changes, the luminance of the image displayed on the display unit is changed so that the predetermined luminance according to the illuminance in the predetermined area is obtained.

In the invention according to claim 7, the display method performed by the display device includes a current position acquisition step of acquiring a current position, a map information storage step of storing map information, and an illuminance acquisition step of acquiring illuminance of the outside world. A control step of adjusting the brightness of an image to be displayed on the display unit according to the illuminance acquired by the illuminance acquisition step, and the control step includes the current position acquired by the current position acquisition step and the map information The brightness of the image displayed on the display unit is changed so that the predetermined brightness corresponding to the illuminance in the predetermined area is obtained before the moving object enters the predetermined area where the illuminance of the outside world changes. .

According to an eighth aspect of the present invention, a display program that includes a computer and is executed by a display device includes: a current position acquisition unit that acquires a current position; a map information storage unit that stores map information; According to the illuminance acquisition means to be acquired and the illuminance acquired by the illuminance acquisition means, the illuminance acquisition means functions as control means for adjusting the luminance of an image to be displayed on the display unit, and the control means is configured to function as a current Based on the position and the map information, an image to be displayed on the display unit so as to have a predetermined luminance corresponding to the illuminance in the predetermined area before the moving body enters the predetermined area where the illuminance of the outside world changes. Change the brightness.

In a tenth aspect of the present invention, the display device is acquired by a current position acquisition unit that acquires a current position, a map information storage unit that stores map information, a display unit that displays an image, and the current position acquisition unit. Control means for changing the luminance of the image displayed on the display means before the moving body enters the predetermined area where the illuminance of the outside world changes based on the current position and the map information.

1 shows a schematic configuration of a display device according to an embodiment. The figure for demonstrating the brightness | luminance control method concerning a present Example concretely is shown. The processing flow concerning a present Example is shown.

In one aspect of the present invention, the display device includes a current position acquisition unit that acquires a current position, a map information storage unit that stores map information, an illuminance acquisition unit that acquires illuminance of the outside world, and the illuminance acquisition unit. Control means for adjusting the brightness of an image to be displayed on the display unit according to the acquired illuminance, and the control means is based on the current position acquired by the current position acquisition means and the map information. Before the moving body enters the predetermined area where the illuminance changes, the luminance of the image displayed on the display unit is changed so as to have a predetermined luminance corresponding to the illuminance in the predetermined area.

The above display device is used by being mounted on a moving body such as a vehicle. The current position acquisition means acquires the current position, the map information storage means stores map information, and the illuminance acquisition means acquires the illuminance of the outside world. Then, the control unit adjusts the luminance of the image displayed on the display unit (hereinafter, referred to as “display luminance” as appropriate) to the luminance according to the illuminance acquired by the illuminance acquisition unit. Specifically, based on the current position and the map information, the control means determines a predetermined amount according to the illuminance of the predetermined area regardless of the illuminance acquired by the illuminance acquisition means before the moving body enters the predetermined area. The luminance of the image displayed on the display unit is changed so that the luminance is the same. The “predetermined area” is an area where an illuminance change of a predetermined value or more occurs. The control means identifies a predetermined area based on the map information, and changes the display luminance to a predetermined luminance according to the illuminance of the predetermined area when the current position reaches a predetermined position that is somewhat distant from the predetermined area. By doing so, it is possible to appropriately set the display luminance corresponding to the illuminance of the predetermined area from some time before entering the predetermined area. For this reason, it is possible to suppress deterioration in visibility such as a user feeling the display unit dazzling when entering a predetermined area.

Preferably, in the above display device, the display device is used in a moving body, and the control means is arranged on the display unit before the moving body enters the predetermined area existing in the moving direction of the moving body. Change the brightness of the image to be displayed.

In one aspect of the above display device, the control unit has the display unit configured to have a luminance according to the illuminance acquired by the illuminance acquisition unit during passage of the predetermined region after the moving body has escaped the predetermined region. Control is performed to maintain the brightness of the image displayed on the screen.

In this aspect, the illuminance acquired by the illuminance acquisition unit during the passage of the predetermined area, regardless of the illuminance currently acquired by the illuminance acquisition unit for a certain period of time, even after the moving body has escaped from the predetermined area. The display brightness according to the is maintained. Thereby, it is possible to maintain the display luminance corresponding to the illuminance of the predetermined region for a certain period after exiting the predetermined region. Therefore, it is possible to suppress deterioration in visibility such as a user feeling the display unit dazzling when the predetermined area is escaped.

In another aspect of the display device, the control unit acquires the illuminance acquisition unit during the passage of the predetermined area until a first predetermined time elapses after the moving body exits the predetermined area. Control is performed to maintain the luminance of the image displayed on the display unit to a luminance according to the illuminance, and after the first predetermined time has elapsed since the moving body exited the predetermined region, Control for changing the luminance of the image displayed on the display unit from the luminance according to the illuminance acquired by the illuminance acquisition unit during passage from the luminance according to the illuminance acquired by the illuminance acquisition unit after exiting the predetermined area I do.

According to this aspect, the display brightness according to the illuminance acquired by the illuminance acquisition means during passage through the predetermined area can be maintained until the user's eyes get used to the change in illuminance due to escape from the predetermined area. In addition, the display brightness according to the illuminance acquired by the illuminance acquisition unit while passing through the predetermined area is appropriately changed from the display luminance according to the illuminance acquired by the illuminance acquisition means after exiting the predetermined area without giving the user a sense of incongruity. Can be changed.

In another aspect of the display device, the control unit causes the display unit to display an image at the predetermined luminance until a second predetermined time has elapsed after the moving body has entered the predetermined area. The luminance is controlled according to the following, and after the second predetermined time has elapsed since the moving body entered the predetermined area, the luminance according to the illuminance acquired by the illuminance acquisition unit is increased from the predetermined luminance. Control is performed to change the luminance of the image displayed on the display unit.

According to this aspect, it is possible to appropriately maintain the predetermined display luminance until the user's eyes get used to the illuminance change due to the entry into the predetermined area. Moreover, it can change appropriately from the predetermined display brightness to the display brightness corresponding to the illuminance acquired by the illuminance acquisition means without giving the user a sense of incongruity. Instead of changing to the display luminance corresponding to the illuminance acquired by the illuminance acquisition means, it may be changed to the display luminance set in advance as the luminance to be used while passing through the predetermined area.

In a preferred embodiment, a tunnel can be used as the predetermined area.

In another aspect of the present invention, a display method performed by the display device includes a current position acquisition step of acquiring a current position, a map information storage step of storing map information, an illuminance acquisition step of acquiring illuminance of the outside world, A control step of adjusting the brightness of an image to be displayed on the display unit in accordance with the illuminance acquired by the illuminance acquisition step, and the control step includes the current position acquired by the current position acquisition step and the map information. Based on this, before the moving body enters the predetermined area where the illuminance of the external environment changes, the luminance of the image displayed on the display unit is changed so as to have a predetermined luminance corresponding to the illuminance in the predetermined area.

In another aspect of the present invention, a display program that includes a computer and is executed by a display device acquires the computer from a current position acquisition unit that acquires a current position, a map information storage unit that stores map information, and an illuminance of the outside world. Illuminance acquisition means for controlling the brightness of an image to be displayed on the display unit according to the illuminance acquired by the illuminance acquisition means, and the control means is a current position acquired by the current position acquisition means And, based on the map information, before the moving object enters the predetermined area where the illuminance of the outside world changes, the image of the image displayed on the display unit is set to have a predetermined luminance according to the illuminance in the predetermined area. Change the brightness.

Also by the display method and the display program described above, it is possible to suppress deterioration in visibility such as a dazzling display when entering a predetermined area.

Note that the display program can be suitably handled in a state of being recorded on a recording medium.

Furthermore, in another aspect of the present invention, an image display device includes a current position acquisition unit that acquires a current position, a map information storage unit that stores map information, a display unit that displays an image, and the current position acquisition unit. Control means for changing the luminance of the image displayed on the display means before the moving body enters the predetermined area where the illuminance of the outside world changes based on the current position acquired by the user and the map information.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

[Configuration of display device]
FIG. 1 shows a schematic configuration of a display device 100 according to the present embodiment. As shown in FIG. 1, the display device 100 mainly includes an independent positioning device 10, a GPS receiver 18, a control unit 20, a map database 36, a display unit 40, and an illuminance sensor 50. The display device 100 is mounted on a moving body such as a vehicle.

The self-supporting positioning device 10 functions as a self-supporting positioning sensor. Specifically, the self-supporting positioning apparatus 10 includes an acceleration sensor, an angular velocity sensor, a distance sensor, and the like (not shown). The acceleration sensor detects the acceleration of the vehicle, the angular velocity sensor detects the angular velocity of the vehicle, and the distance sensor detects the vehicle speed. Hereinafter, the data detected by the self-supporting positioning device 10 is referred to as “self-supporting positioning data”. Independent positioning data includes vehicle speed pulses, acceleration data, relative orientation data, angular velocity data, and the like.

The GPS receiver 18 receives radio waves 19 carrying downlink data including positioning data from a plurality of GPS satellites. The positioning data is used to detect the absolute position of the vehicle from, for example, latitude and longitude information. Hereinafter, the positioning data corresponding to the data received by the GPS receiver 18 is referred to as “GPS positioning data”.

The map database 36 is composed of, for example, an HDD and stores various map information such as road information, terrain information, and facility information. For example, information used for general navigation processing can be used as the map information.

The illuminance sensor 50 is a sensor configured to be able to detect illuminance (brightness) in the external environment of the vehicle, and detects, for example, illuminance irradiated on the display unit 40 and the like.

The control unit 20 includes an interface (not shown), a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The control unit 20 mainly controls the display unit 40. Specifically, the control unit 20 acquires from the above-described independent positioning data acquired from the independent positioning device 10, GPS positioning data acquired from the GPS receiver 18, map information acquired from the map database 36, and the illuminance sensor 50. Based on the illuminance, the display unit 40 is controlled. In the present embodiment, the control unit 20 mainly performs control for adjusting the luminance of the display unit 40. The control unit 20 corresponds to an example of a “control unit” in the present invention.

The display unit 40 displays various display data under the control of the control unit 20. For example, the display unit 40 displays information for supporting driving according to map information and the like. The display unit 40 is configured by a head-up display or the like. The head-up display is a device that visually recognizes an image as a virtual image from the position (eye point) of the driver's eyes.

The display unit 40 adjusts the brightness of an image to be displayed (hereinafter referred to as “display brightness”) by controlling the drive current, the drive voltage, and the like by the control unit 20. Basically, the control unit 20 performs a process for setting the display brightness according to the illuminance detected by the illuminance sensor 50 (hereinafter referred to as “normal setting process”) on the display unit 40. In this case, the control unit 20 performs a normal setting process in which the display brightness is set higher as the illuminance is higher, and the display brightness is set lower as the illuminance is lower.

In the normal setting process, the display brightness may be continuously changed according to the illuminance, or the display brightness may be changed stepwise according to the illuminance. In the latter case, for example, the illuminance is divided into predetermined ranges, and the luminance is changed stepwise to a predetermined display luminance for each range. In the following, “display luminance according to illuminance detected by the illuminance sensor 50” includes both display luminance continuously changed according to illuminance and display luminance changed stepwise according to illuminance. Shall be included.

[Brightness control method]
Next, a luminance control method performed by the control unit 20 in the present embodiment will be described. In the present embodiment, when the illuminance of the outside world changes abruptly, the control unit 20 performs a process of setting an appropriate display luminance before and after the illuminance change. Specifically, the control unit 20 sets the display brightness different from the display brightness corresponding to the illuminance detected by the illuminance sensor 50 before and after a predetermined region (for example, a tunnel) where the illuminance of the outside world changes rapidly. Processing is performed, that is, processing different from the normal setting processing is performed.

Specifically, before the vehicle enters the predetermined area, the control unit 20 performs a process of presetting the display luminance according to the illuminance of the predetermined area instead of the display luminance corresponding to the illuminance detected by the illuminance sensor 50. As a result, since the display brightness according to the illuminance of the predetermined area can be appropriately set from some time before entering the predetermined area, the visibility of the display unit 40 such as making the display unit 40 feel dazzling when entering the predetermined area is improved. Deterioration can be suppressed. Furthermore, the control unit 20 maintains the display brightness according to the illuminance of the predetermined area instead of the display brightness corresponding to the illuminance detected by the illuminance sensor 50 for a certain time even after the vehicle escapes from the predetermined area. I do. Thereby, since the display brightness according to the illuminance of the predetermined area can be appropriately maintained for a certain amount after the predetermined area is escaped, the visibility such as the display unit 40 feels dazzling when the predetermined area is escaped. Can be prevented.

Referring to FIG. 2, the brightness control method according to the present embodiment will be specifically described. Here, the brightness control method executed when the vehicle enters the tunnel and then escapes is illustrated. That is, an example of a tunnel is given as the predetermined area. FIG. 2 shows a graph of illuminance detected by the illuminance sensor 50 (shown above) and a graph of display luminance of the display unit 40 controlled by the control unit 20 (shown below). FIG. 2 shows time in the horizontal direction.

Until time t1, the control unit 20 sets the display luminance according to the illuminance detected by the illuminance sensor 50, that is, executes a normal setting process. At time t <b> 1, the control unit 20 starts a process of gradually reducing the display luminance (hereinafter referred to as “pre-entry process”) regardless of the illuminance detected by the illuminance sensor 50. In this case, at time t1, the controller 20 arrives at a position where the distance to the tunnel entry is a predetermined distance (hereinafter referred to as “position before entering the dark place”) from the current position of the vehicle and the map information. It is determined that it has been performed, and the pre-entry process is started. Then, the control unit 20 reduces the display luminance to a display luminance corresponding to the illuminance in the tunnel over a predetermined time (from time t1 to time t2). For example, the control unit 20 reduces the display brightness to a preset value according to the assumed illuminance in the tunnel. In one example, the control unit 20 reduces the display brightness to a display brightness lower than the display brightness set according to the actual illuminance in the tunnel.

Note that the position before entering the dark place is set at a position away from the tunnel by a distance at least longer than the distance traveled by the vehicle during a predetermined time for reducing the display brightness (that is, the time for performing the pre-entry process). The predetermined time for performing the pre-entry process is set in advance in consideration of human visual characteristics and the like. For example, it is set to a relatively long time so as not to cause a sense of incongruity even when the display luminance is changed.

Next, at time t2, the control unit 20 performs a process of fixing the display luminance (hereinafter referred to as “rush hold process”). Specifically, the control unit 20 maintains the display luminance reduced by the pre-entry process regardless of the illuminance detected by the illuminance sensor 50. Thereafter, at time t3, the vehicle actually enters the tunnel. Even after time t3, the control unit 20 continues the rush hold process. Specifically, the control unit 20 maintains the display luminance reduced by the pre-entry process until a predetermined time elapses after the vehicle enters the tunnel (until time t4). The predetermined time is set based on the time required for the human eye to get used to the illuminance change due to the tunnel entry, and corresponds to the “second predetermined time” in the present invention.

Next, between the time t4 and the time t5, the control unit 20 gradually changes the display luminance from the display luminance fixed by the rush hold process to the display luminance corresponding to the illuminance detected by the illuminance sensor 50. Processing (hereinafter referred to as “pre-passing pre-processing”). Then, after time t5, the control unit 20 performs a process of setting the display luminance according to the illuminance detected by the illuminance sensor 50 (hereinafter referred to as “passing process”). The passing process is a process similar to the normal setting process or a process of setting a fixed value for passing.

Next, at time t6, the control unit 20 performs a process of fixing the display luminance (hereinafter referred to as “escape hold process”). In this case, at time t <b> 6, the controller 20 arrives at a position where the distance to the tunnel escape is a predetermined distance (hereinafter referred to as “position before dark place escape”) based on the current position of the vehicle and the map information. It is determined that the escape hold process is started. Specifically, the control unit 20 maintains the display luminance set at the time t6. Thereafter, at time t7, the vehicle actually exits the tunnel. Even after time t7, the control unit 20 continues the escape hold process. Specifically, the control unit 20 maintains the display brightness set at the time t6 until a predetermined time has elapsed after the vehicle exits the tunnel (until time t8). The predetermined time is set based on the time required for the human eye to get used to the illumination change due to escape from the tunnel, and corresponds to the “first predetermined time” in the present invention. The “first predetermined time” and the “second predetermined time” may be the same time or different times.

Next, between time t8 and time t9, the control unit 20 gradually increases the display luminance from the display luminance fixed by the escape hold process to the display luminance corresponding to the illuminance detected by the illuminance sensor 50. (Hereinafter referred to as “post-escape process”). After time t9, the control unit 20 sets the display luminance according to the illuminance detected by the illuminance sensor 50, that is, executes a normal setting process.

According to the brightness control method as described above, the display brightness can be sufficiently lowered by the pre-entry process and the inrush hold process at the time of tunnel entry when the illuminance of the outside world changes rapidly. Thereby, it is possible to appropriately suppress the user from feeling dazzling the display unit 40 when entering the tunnel. Moreover, the display brightness can be set to be dark at the time of escape from the tunnel in which the illuminance of the outside changes rapidly by the escape hold process. Thereby, it is possible to appropriately suppress the user from feeling dazzling the display unit 40 when exiting the tunnel. Furthermore, according to the pre-entry process, the pre-passing process, and the post-escape process, the display luminance is controlled to be appropriately changed, so that the user is appropriately prevented from feeling uncomfortable due to the change in the display luminance. It becomes possible to do.

[Processing flow]
Next, a processing flow according to the present embodiment will be described with reference to FIG. Here, a processing flow executed when a vehicle enters a dark place (for example, a tunnel) and then escapes will be described. Further, the processing flow is executed by the control unit 20 while the vehicle is traveling. Specifically, the processing flow is realized by the control unit 20 executing a program stored in advance.

First, in step S101, the control unit 20 executes a process (normal setting process) for setting display luminance according to the illuminance detected by the illuminance sensor 50. Then, the process proceeds to step S102.

In step S102, the control unit 20 determines whether or not the current position of the vehicle is a pre-dark position. In this case, the control unit 20 obtains the current position of the vehicle based on the autonomous positioning data acquired from the autonomous positioning device 10 and / or the GPS positioning data acquired from the GPS receiver 18, and the map information acquired from the map database 36. The intrusion position of the dark place is specified based on the above, and the determination in step S102 is performed based on the obtained current position and the specified intrusion position of the dark place. Note that the position before entering the dark place is set to a position away from the entry position in the dark place by a distance at least longer than the distance traveled by the vehicle while the display brightness is reduced in the pre-entry process. A fixed value may be used as the position before entering the dark place, or a variable that is changed according to the vehicle speed or the like may be used.

If the current position is the position before entering the dark place (step S102; Yes), the process proceeds to step S103. If the current position is not the position before entering the dark place (step S102; No), the process returns to step S102. In step S103, the control unit 20 performs a process of reducing the display luminance over a predetermined time (pre-entry process) before entering the dark place. Specifically, the control unit 20 reduces the display luminance to the display luminance corresponding to the illuminance in the dark place over a predetermined time. For example, the control unit 20 reduces the display brightness to a preset display brightness according to the assumed illuminance in a dark place. The predetermined time used in step S103 is a time set in advance in consideration of human visual characteristics and the like. For example, it is set to a relatively long time so as not to cause a sense of incongruity even when the display luminance is changed. After step S103, the process proceeds to step S104.

In step S104, the control unit 20 performs a process for maintaining the current display luminance (inrush hold process). That is, the control unit 20 maintains the display luminance that is reduced by the pre-entry process. Then, the process proceeds to step S105.

In step S105, the control unit 20 determines whether or not the vehicle has entered a dark place. Specifically, the control unit 20 performs step S105 based on the illuminance detected by the illuminance sensor 50 and / or the current position (obtained based on the independent positioning data and / or GPS positioning data) and the map information. Make a decision. In this case, when the change in illuminance detected by the illuminance sensor 50 exceeds the threshold value and / or when the current position of the vehicle matches the intrusion position in the dark place specified from the map information, It is determined that the vehicle has entered a dark place.

If the vehicle has entered the dark place (step S105; Yes), the process proceeds to step S106. If the vehicle has not entered the dark place (step S105; No), the process returns to step S105. In step S106, the control unit 20 continues the rush hold process for a predetermined time. That is, the control unit 20 maintains the display luminance reduced by the pre-entry process until a predetermined time elapses after the vehicle enters the dark place. Note that the predetermined time used in step S106 is set based on the time required for the human eye to get used to the illuminance change in the outside world due to the entry into the dark place. After step S106, the process proceeds to step S107.

In step S107, the control unit 20 performs a process of changing the display luminance during passage through the dark place over a predetermined time (pre-passage pre-process). That is, the control unit 20 gradually changes the display luminance from the display luminance fixed by the rush hold processing to the display luminance according to the illuminance detected by the illuminance sensor 50 or the display luminance by the fixed value setting for passing. Change. The predetermined time used in step S107 is a time set in advance in consideration of human visual characteristics and the like. For example, it is set to a relatively long time so as not to cause a sense of incongruity even when the display luminance is changed. After step S107, the process proceeds to step S108.

In step S108, the control unit 20 performs a process of setting the display luminance during passage in the dark place (passing process). In other words, the control unit 20 sets the display luminance according to the illuminance detected by the illuminance sensor 50 or the display luminance based on the fixed value setting for passing. Then, the process proceeds to step S109.

In step S109, the control unit 20 determines whether or not the current position of the vehicle is a position before escape from the dark place. In this case, the control unit 20 performs the determination in step S109 based on the current position obtained based on the independent positioning data and / or the GPS positioning data and the escape position of the dark place specified based on the map information. The position before escape from the dark place is set to a position away from the escape position in the dark place by a predetermined distance. The predetermined distance corresponds to a margin set in consideration of the estimation error of the current position, the estimation error of the escape position in the dark place, and the like.

If the current position is the position before escape from the dark place (step S109; Yes), the process proceeds to step S110. If the current position is not the position before escape from the dark place (step S109; No), the process returns to step S108. In step S110, the control unit 20 performs a process (escape hold process) for maintaining the current display luminance. Specifically, the control unit 20 maintains the display brightness set when it is determined that the current position is the position before escape from the dark place. Then, the process proceeds to step S111.

In step S111, the control unit 20 determines whether or not the vehicle has escaped from the dark place. Specifically, the control unit 20 performs step S111 based on the illuminance detected by the illuminance sensor 50 and / or the current position (obtained based on the independent positioning data and / or GPS positioning data) and the map information. Make a decision. In this case, when the change in the illuminance detected by the illuminance sensor 50 exceeds the threshold, and / or when the current position of the vehicle matches the escape position of the dark place specified from the map information, It is determined that the vehicle has escaped from the dark place.

If the vehicle escapes from the dark place (step S111; Yes), the process proceeds to step S112. If the vehicle does not escape from the dark place (step S111; No), the process returns to step S111. In step S112, the control unit 20 continues the escape hold process for a predetermined time. That is, the control unit 20 maintains the display brightness set when the current position is determined to be the position before escape from the dark place until a predetermined time elapses after the vehicle escapes from the dark place. Note that the predetermined time used in step S112 is set based on the time required for the human eye to get used to changes in illuminance in the external environment due to escape from the dark place. After step S112, the process proceeds to step S113.

In step S113, the control unit 20 performs processing (post-escape processing) for changing the display luminance at normal time over a predetermined time. That is, the control unit 20 gradually changes the display luminance from the display luminance fixed by the escape hold process to the display luminance corresponding to the illuminance detected by the illuminance sensor 50. The predetermined time used in step S113 is a time set in advance in consideration of human visual characteristics and the like. For example, it is set to a relatively long time so as not to cause a sense of incongruity even when the display luminance is changed. After step S113, the process proceeds to step S114.

In step S114, the control unit 20 executes a process (normal setting process) for setting the display brightness according to the illuminance detected by the illuminance sensor 50. Then, the process ends.

According to the processing flow described above, an appropriate display brightness can be set at the time of entering and exiting a dark place, so that the user feels the display unit 40 dazzling when entering and exiting a dark place. It becomes possible to suppress the deterioration of the visibility.

[Modification]
In the above example, a tunnel is used as the predetermined area. For example, the shade in a high-rise residential area may be used as the predetermined area. The predetermined area is not limited to using a dark place (specifically, an area with lower illuminance than other areas), and an area with higher illuminance than other areas may be used as the predetermined area. For example, a night tunnel corresponds to a region with higher illuminance than other regions. As described above, the predetermined area may be an area where the illuminance of the outside world changes abruptly (specifically, an area where an illuminance change of a predetermined value or more occurs), and various areas can be used.

In the above, an example in which various determinations and processes are performed based on the current position, the map information, and the illuminance detected by the illuminance sensor 50 has been described. In addition, the determination is performed using weather information and time zone information. The processing may be performed. For example, the above-described predetermined region can be determined based on weather information or time zone information.

The present invention is not limited to application to a head-up display. The present invention can be suitably applied to a display unit composed of liquid crystal. For example, in addition to a head-up display, it can be applied to a display of a navigation device, a head-mounted display, and the like.

The present invention is not limited to application to vehicles. The present invention can be applied to various mobile objects such as ships, helicopters, and airplanes in addition to vehicles. In addition, the present invention can also be applied to a display device (for example, a head mounted display) used by a pedestrian. That is, the “moving body” includes pedestrians.

As described above, the embodiments are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit or idea of the invention that can be read from the claims and the entire specification.

The present invention can be used for various display devices used in a moving body such as a vehicle.

DESCRIPTION OF SYMBOLS 10 Self-supporting positioning apparatus 18 GPS receiver 20 Control part 36 Map database 40 Display unit 50 Illuminance sensor 100 Display apparatus

Claims (10)

Current position acquisition means for acquiring the current position;
Map information storage means for storing map information;
Illuminance acquisition means for acquiring the illuminance of the outside world,
Control means for adjusting the luminance of the image to be displayed on the display unit according to the illuminance acquired by the illuminance acquisition means,
Based on the current position acquired by the current position acquisition unit and the map information, the control unit determines a predetermined amount according to the illuminance in the predetermined area before the moving body enters the predetermined area where the illuminance of the outside world changes. The display device is characterized in that the brightness of an image displayed on the display unit is changed so that the brightness of The display device is used in a moving body,
The said control means changes the brightness | luminance of the image displayed on the said display part, before the said mobile body approachs into the said predetermined area | region which exists in the moving direction of the said mobile body. Display device. The control means maintains the brightness of an image to be displayed on the display unit at a brightness according to the illuminance acquired by the illuminance acquisition means during passage through the predetermined area after the moving body has escaped from the predetermined area. The display device according to claim 1, wherein control is performed. The control means includes
Until the first predetermined time elapses after the moving body exits the predetermined area, the display unit displays an image displayed on the display unit at a luminance corresponding to the illuminance acquired by the illuminance acquisition unit during the passage of the predetermined area. Control to maintain the brightness,
After the first predetermined time has elapsed since the moving body escaped from the predetermined area, the luminance according to the illuminance acquired by the illuminance acquisition means during the passage of the predetermined area, after the escape from the predetermined area The display device according to claim 3, wherein control is performed to change the luminance of an image displayed on the display unit to a luminance according to the illuminance acquired by the illuminance acquisition unit. The control means includes
Until the second predetermined time elapses after the moving body enters the predetermined area, the predetermined luminance is controlled to maintain the luminance of the image displayed on the display unit,
The luminance of the image displayed on the display unit from the predetermined luminance to the luminance corresponding to the illuminance acquired by the illuminance acquisition means after the second predetermined time has elapsed since the moving body entered the predetermined region. The display device according to claim 1, wherein control is performed to change the value. 6. The display device according to claim 1, wherein the predetermined area is a tunnel. A display method performed by a display device,
A current position acquisition process for acquiring the current position;
A map information storing step for storing map information;
Illuminance acquisition process for acquiring the illuminance of the outside world,
A control step of adjusting the luminance of the image to be displayed on the display unit according to the illuminance acquired by the illuminance acquisition step,
The control step is based on the current position acquired by the current position acquisition step and the map information, and a predetermined amount corresponding to the illuminance in the predetermined region before the moving body enters the predetermined region where the illuminance of the outside world changes. A display method characterized by changing the brightness of an image displayed on the display unit so as to have a brightness of. A display program comprising a computer and executed by a display device,
The computer,
Current position acquisition means for acquiring the current position;
Map information storage means for storing map information;
Illuminance acquisition means for acquiring the illuminance of the outside world,
According to the illuminance acquired by the illuminance acquisition means, function as control means for adjusting the brightness of the image to be displayed on the display unit,
Based on the current position acquired by the current position acquisition unit and the map information, the control unit determines a predetermined amount according to the illuminance in the predetermined area before the moving body enters the predetermined area where the illuminance of the outside world changes. A display program for changing the brightness of an image to be displayed on the display unit so that the brightness of A recording medium on which the display program according to claim 8 is recorded. Current position acquisition means for acquiring the current position;
Map information storage means for storing map information;
Display means for displaying an image;
Based on the current position acquired by the current position acquisition means and the map information, control means for changing the brightness of an image displayed on the display means before the moving body enters a predetermined area where the illuminance of the outside world changes. And a display device.

Images