JP2009107494A - Head-up display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make information displayed in a display region easy to be seen when operating a wiper. <P>SOLUTION: This head-up display device 1A for displaying information in the display region set on windshield of a vehicle includes a display device 15 for displaying prescribed information in the display region as a display part, a wiper operation deciding part 21 for deciding whether or not the wiper is operated, a wiper position detecting part 22 for detecting the position of the wiper on the windshield, and an overlapped region calculating part 23 for calculating an overlapped region where the wiper is overlapped with the display region based on an output of the wiper position detecting part 22. When it is decided that the wiper is operated by the wiper operation deciding part 21, the display device 15 makes luminance of the display part in the overlapped region where the wiper is overlapped with the display region smaller than that of the display part in a non-overlapped region where the wiper is not overlapped with the display region. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  2. Description of the Related Art A vehicle head-up display device (hereinafter sometimes abbreviated as a HUD device) that displays various information such as vehicle speed in a display region set on a windshield of a vehicle is known. In the HUD device, if the display area is covered with the operation area of the wiper, the display of information may be difficult to see when the wiper is operated in rainy weather or the like.

Patent Document 1 discloses a HUD device in which a display area is positioned in a wiper wiping area almost in front of the driver's seat when the wiper is not operated, and the display area is moved out of the wiper wiping area when the wiper is operated.
JP-A-7-266925

According to the HUD device disclosed in Patent Document 1, since information is displayed in an area where the wiper is not moving when the wiper is activated, the display area is moved although the difficulty in viewing the wiper is eliminated. In order to achieve this, a plurality of display devices are required, which increases costs.
In addition, since the display position changes depending on whether the wiper is activated or deactivated, the passenger may feel uncomfortable.

  Accordingly, the present invention provides a vehicle head-up display device that does not make the passenger feel uncomfortable and makes it easy to see displayed information even when the wiper is activated.

The vehicle head-up display device according to the present invention employs the following means in order to solve the above problems.
The invention according to claim 1 is for a vehicle that displays information in a display area (for example, a display area 100 in an embodiment described later) set on a windshield of the vehicle (for example, a windshield 101 in an embodiment described later). In a head-up display device (for example, a vehicle head-up display device 1A in an embodiment described later), predetermined information is displayed on the display area as a display unit (for example, display units 104, 104a to 104c in an embodiment described later). Display means (for example, a display device 15 in an embodiment to be described later), wiper operation determination means for determining whether or not the wiper is operating (for example, a wiper operation determination unit 21 in an embodiment to be described later), and the windshield Wiper position detecting means for detecting the position of the wiper (for example, described later) The overlap area calculation for calculating the overlap area (for example, the overlap part 105 in the embodiment described later) where the wiper and the display area overlap based on the output of the wiper position detection unit 22) in the embodiment and the wiper position detection means. Means (for example, an overlapping area calculation unit 23 in an embodiment to be described later), and the display means overlaps the wiper and the display area when the wiper operation determining means determines that the wiper is operating. The luminance of the display unit in the overlapping region is different from the luminance of the display unit in the non-overlapping region where the wiper and the display region do not overlap (for example, the non-overlapping unit 106 in the embodiment described later). It is characterized by that.
With this configuration, it becomes possible to adjust the difference in the apparent luminance of the display unit due to the difference in the luminance of the background between the overlapping region and the non-overlapping region.

The invention according to claim 2 is characterized in that, in the invention according to claim 1, the luminance of the display unit in the overlapping region is made smaller than the luminance of the display unit in the non-overlapping region.
With this configuration, even if the background brightness in the overlapping region and the non-overlapping region is different, the apparent brightness of the display unit can be made substantially equal.

The invention according to claim 3 is for a vehicle that displays information in a display area (for example, a display area 100 in an embodiment described later) set on a windshield of the vehicle (for example, a windshield 101 in the embodiment described later). In a head-up display device (for example, a vehicle head-up display device 1B in an embodiment described later), predetermined information is displayed on the display area as a display unit (for example, display units 104, 104a to 104c in an embodiment described later). Display means (for example, a display device 15 in an embodiment to be described later), wiper operation determination means for determining whether or not the wiper is operating (for example, a wiper operation determination unit 21 in an embodiment to be described later), and wiping of the wiper Distinguishing between the display part located in the area and the display part located outside the wiping area Another means (for example, a wiping part / non-wiping part determination part 25 in an embodiment described later), and when the display means determines that the wiper operation is being performed by the wiper operation determination means, The brightness of the display unit located in the screen is different from the brightness of the display unit located outside the wiping area.
By configuring in this way, it becomes possible to adjust the difference in the apparent luminance of the display unit due to the difference in luminance between the background in the wiping area and the outside of the wiping area.

The invention according to claim 4 is characterized in that, in the invention according to claim 3, the brightness of the display part located outside the wiping area is made larger than the brightness of the display part located within the wiping area. And
By configuring in this way, even if the luminance of the background in the wiping area is different from that in the outside of the wiping area, the apparent luminance of the display unit can be made substantially equal.

The invention according to claim 5 is the invention according to claim 3 or claim 4, wherein after the wiper is stopped, the predetermined time is located outside the wiping area and the brightness of the display unit located in the wiping area. The process of making the brightness of the display unit to be different be continued.
With this configuration, it is possible to continue the control for changing the luminance of the display unit until raindrops remaining on the windshield after the wiper operation stops disappear.

According to the first aspect of the present invention, it is possible to adjust the difference in the apparent luminance of the display unit due to the difference in the luminance of the background between the overlapping region and the non-overlapping region.
According to the invention according to claim 2, even if the luminance of the background in the overlapping region and the non-overlapping region is different, the apparent luminance of the display unit can be made substantially equal. The display part does not feel particularly dazzling and there is no sense of incongruity. Therefore, the readability of the display unit is improved.
In addition, since the passenger does not feel a part of the display part particularly bright, the display part does not become a visual stimulus for the passenger and does not feel bothersome.

According to the invention which concerns on Claim 3, it becomes possible to adjust the difference in the apparent brightness of the display part resulting from the difference in the brightness | luminance of the background in a wiping area | region and a wiping area | region outside.
According to the fourth aspect of the present invention, even if the brightness of the background in the wiping area is different from that in the wiping area, the apparent luminance of the display unit in the wiping area and outside the wiping area can be made substantially equal. Therefore, the occupant does not feel particularly difficult to see the display portion outside the wiping area, and there is no sense of incongruity. Therefore, the readability of the display unit is improved.
According to the fifth aspect of the invention, it is possible to continue the control for making the luminance of the display unit different until the raindrops and the like remaining on the windshield after the wiper operation stops.

Embodiments of a vehicle head-up display device according to the present invention will be described below with reference to the drawings of FIGS.
[Example 1]
First, a first embodiment of a vehicle head-up display device according to the present invention will be described with reference to the drawings of FIGS.
As shown in FIG. 1, a vehicle head-up display device 1A according to the first embodiment includes a wiper switch 11, a wiper encoder 12, a sunshine sensor 13, a display controller (luminance control means) 14, and a display device (display means). ) 15 and an electronic control unit (ECU) 20.

The wiper switch 11 is a switch operated by an occupant when operating the wiper, and an ON / OFF signal of the wiper switch 11 is input to the ECU 20.
The wiper encoder 12 detects a rotation angle from the initial position (storage position) of the wiper arm, and outputs detection data to the ECU 20.
The sunshine sensor 13 is installed, for example, on an instrument panel or a windshield of the vehicle, detects the amount of sunshine, and outputs detection data to the ECU 20.

  The display controller 14 determines information to be displayed based on an input signal from a travel control device (not shown) or the like (for example, the vehicle speed of the host vehicle, a right / left turn instruction, the presence / absence of a preceding vehicle, etc.) . The display controller 14 controls the luminance of the display unit corresponding to the information to be displayed based on the input signal from the ECU 20.

  The display device 15 includes a light source, a display, a mirror (all not shown), and the like. Based on an input signal from the display controller 14, a predetermined position on the windshield (above the instrument panel in front of the driver's seat) Project necessary information to the combiner installed in Therefore, the portion where the combiner is installed coincides with the display area for displaying information.

  The ECU 20 includes a wiper operation determination unit (wiper operation determination unit) 21, a wiper position detection unit (wiper position detection unit) 22, an overlap region calculation unit (overlap region calculation unit) 23, and a day / night determination unit 24. Configured.

The wiper operation determination unit 21 determines that the wiper is in operation when an ON signal is input from the wiper switch 11, and determines that the wiper is in an inactive state when no ON signal is input from the wiper switch 11.
The wiper position detection unit 22 calculates the position of the wiper arm based on the rotation angle input from the wiper encoder 12.

  In this embodiment, the rotation angle of the wiper arm is directly detected by the wiper encoder 12. However, without using the wiper encoder 12, the elapsed time from the start of the wiper operation is measured, and the movement angular velocity ω (rad of the wiper arm is measured. / S), the operation interval I during the intermittent operation of the wiper arm, and the elapsed time t (sec) from the start of the wiper operation, it is also possible to calculate the rotation angle of the wiper arm.

The overlapping area calculation unit 23 calculates an area where the display area (combiner) provided on the windshield and the wiper overlap (hereinafter referred to as an overlapping area), and outputs the calculated area to the display controller 14.
With reference to FIG. 2, an example of a method for calculating the overlapping area will be described. The wiper arm rotates around the rotation center O, and a rectangular display area (combiner) is located near the rotation center O on the windshield. When 100 is provided, for example, an xy coordinate having an origin at one of the vertices of the display area 100 (the vertex farthest from the rotation center O in the example of FIG. 2) is set, and the display area 100 is set. Is divided into a large number of small rectangular unit screens so that each unit screen can be specified by xy coordinates (x (1, 2... M), y (1, 2... N)). The rotation center O of the wiper arm is indicated by (0x, 0y) in the xy coordinates, and a straight line passing through the rotation center O and parallel to the Y axis is defined as a reference line L.

Then, for example, based on the rotation angle of the wiper arm detected by the encoder 12, the rotation angle θ of the wiper arm from the reference line L is calculated, and the center line Wc at the current position of the wiper arm is obtained on the xy coordinates. The lines Wl and Wr indicating both side edges of the wiper arm are obtained on the xy coordinates by adding the ½ width of the wiper arm to both sides of the center line Wc.
Furthermore, the ratio of the area of the portion existing in the wiper width region Ww to the area of one unit screen among the unit screens at least partially in the region between the lines Wl and Wr (hereinafter referred to as the wiper width region) Ww is as follows. A flag “1” is set on a unit screen that is equal to or greater than a predetermined value (for example, 50%), and a unit screen group on which the flag “1” is set is defined as an area where the display area and the wiper overlap, that is, an overlapping area.

  The day / night determination unit 24 determines whether it is daytime or nighttime based on the amount of sunlight input from the sunshine sensor 13, and outputs the determination result to the display controller 14. That is, when the amount of sunshine detected by the sunshine sensor 13 is greater than or equal to the threshold value, it is determined that the daytime, and when it is less than the threshold value, it is determined that it is nighttime.

Next, the brightness control of the display unit executed in the display controller 14 will be described.
When the brightness of the display unit consisting of numbers and marks projected on the display area is the same when the wiper is activated and when it is not activated, as is generally done in the past, the windshield When the wiper is moving on the back side of the display area 100 (that is, on the outer surface side of the windshield), when the color of the wiper arm is dark and the external light reflection is low, the portion overlapping the wiper arm in the display area 100 Since the luminance of the background in the overlapping portion (hereinafter referred to as the overlapping portion) is smaller than the luminance of the background in the portion not overlapping with the wiper arm (hereinafter referred to as the non-overlapping portion), the apparent luminance of the display portion in the overlapping portion is not It becomes relatively larger than the luminance of the display portion in the overlapped portion and looks bright (see FIG. 3A).

  FIG. 4A is an image diagram at this time. In the figure, reference numeral 101 denotes a windshield, reference numeral 102 denotes an instrument panel, reference numeral 103 denotes a wiper arm, reference numeral 104a denotes a display unit indicating the vehicle speed of the host vehicle, and reference numeral 104b. Is a display unit indicating a left turn display, and 104c is a display unit indicating the presence of a preceding vehicle (hereinafter referred to as the display unit 104 when the display units 104a to 104c do not need to be individually distinguished). Is an overlapping portion, and reference numeral 106 is a non-overlapping portion.

  Thus, when a part of the display unit 104 is brighter than the other parts, this bright part is felt dazzling for the occupant. Moreover, since this bright part in the display part 104 moves with the movement of the wiper arm 103, it becomes a visual stimulus to move. The display area 100 is present in the vicinity of the peripheral vision when the driver is driving, and this peripheral vision generally has a high detection sensitivity to visual stimuli, so that the bright portion of the display unit 104 moves as described above. Then, the driver may feel annoying.

  Therefore, in the vehicle head-up display device 1A according to the first embodiment, when the wiper is operated, the brightness of the display unit 104 in the overlapping unit 105 is set to the non-overlapping unit 106 in the display region 100 as shown in FIG. The apparent luminance of the display unit 104 in the overlapping unit 105 is made equal to the luminance of the display unit 104 in the non-overlapping unit 106. FIG. 4A is an image diagram at this time, which prevents the display unit 104 in the overlapping unit 105 from appearing brighter than the display unit 104 in the non-overlapping unit 106 so that the display unit 104 does not feel dazzling. To.

  Further, as shown in FIG. 5, the brightness of the background in the display area 100 is different between the daytime and the nighttime, and the brightness of the background in the nighttime is higher than the brightness of the background in the daytime in both the overlapping part 105 and the non-overlapping part 106. Becomes smaller. Furthermore, the luminance difference g1 at night is smaller than the luminance difference f1 during the day (f1> g1) between the luminance of the background at the non-overlapping part 106 and the luminance of the background at the overlapping part 105.

  Therefore, in the first embodiment, the brightness of the background of the overlapping part 105 and the non-overlapping part 106 in the daytime and nighttime is set to a predetermined value based on experience values or the like, and the brightness difference f1 during the day based on these set values. And a luminance difference g1 at night is set in advance. When the luminance of the display unit 104 in the overlapping unit 105 is set smaller than the luminance of the display unit 104 in the non-overlapping unit 106, the luminance difference f1 is applied during the daytime, and the luminance difference g1 during the nighttime. Shall be applied. Thereby, the apparent brightness of the display unit 104 in the overlapping part 105 can be made equal to the brightness of the display part 104 in the non-overlapping part 106 regardless of the difference between daytime and nighttime (a = b = c). = D).

Next, the display unit luminance control in the first embodiment will be described with reference to the flowchart of FIG. The display unit luminance control routine shown in the flowchart of FIG. 6 is repeatedly executed at regular intervals.
First, in step S101, wiper information and display unit information are acquired. The wiper information is ON / OFF of the wiper switch 11, the output (angular velocity) of the wiper encoder 12, the rotation fulcrum position coordinate of the wiper, the width dimension W of the wiper arm 103, and the display unit information is the position coordinate of the display unit 104, etc. It is. As described above, the rotation angle of the wiper arm is determined based on the elapsed time t (sec) from the start of the wiper operation, the moving angular velocity ω (rad / s) of the wiper arm, and the operation interval I (sec) during the intermittent operation of the wiper arm. ), The elapsed time t (sec), the wiper movement angular velocity ω (rad / s), and the wiper operation interval I (sec) are acquired as wiper information instead of the output of the wiper encoder.

Next, it progresses to step S102 and it is determined whether the wiper switch 11 is turned ON.
If the determination result in step S102 is “NO” (OFF), the process returns to step S101.
When the determination result in step S102 is “YES” (ON), the process proceeds to step S103, and the overlapping portion determination process is executed. In the overlapping part determination process, the overlapping part 105 where the display area 100 provided on the windshield and the wiper overlap is calculated by, for example, the method described above, and the coordinates of the display part 104 existing in the overlapping part 105 and the non-overlapping part 106 are calculated. This can be realized by obtaining the coordinates of the display unit 104 existing in the screen.

Next, it progresses to step S104 and it is determined whether the amount of sunshine detected by the sunshine sensor 13 is more than the predetermined value preset as a daytime and nighttime threshold.
If the determination result in step S104 is “YES”, it is determined that it is daytime, the process proceeds to step S105, and overlapping portion luminance interpolation processing corresponding to the daytime is executed. The overlapping portion luminance interpolation processing according to the daytime is performed by setting the luminance of the display unit 104 in the overlapping unit 105 to a value smaller than the luminance of the display unit 104 in the non-overlapping unit 106 by the daytime luminance difference f1. This can be realized (see FIG. 5A).

  On the other hand, when the determination result in step S104 is “NO”, it is determined that it is nighttime, and the process proceeds to step S106, where overlapping portion luminance interpolation processing according to nighttime is executed. The overlapping portion luminance interpolation processing according to the night is realized by setting the luminance of the display unit 104 in the overlapping unit 105 to a value smaller than the luminance of the display unit 104 in the non-overlapping unit 106 by the luminance difference g1 for night. (See FIG. 5B).

  Subsequent to steps S105 and S106, the process proceeds to step S107, and the display controller 14 is set so that the luminance of the display unit 104 in the overlapping unit 105 is smaller than the luminance of the display unit 104 in the non-overlapping unit 106 by the luminance difference f1 or g1. Control and output to the display device 15, and the execution of this routine is temporarily terminated.

In the vehicle head-up display device 1A according to the first embodiment, the apparent luminance of the display unit 104 in the overlapping unit 105 is set to the luminance of the display unit 104 in the non-overlapping unit 106 regardless of the difference between daytime and nighttime. Since it can be made equivalent, the occupant does not feel the display unit 104 in the overlapping unit 105 particularly dazzling and does not feel uncomfortable. Therefore, the readability for the display unit 104 is improved. In addition, since only one display device 15 is available, it is not necessary to increase the cost.
Further, since the occupant does not feel a part of the display unit 104 particularly bright, the display unit 104 does not become a visual stimulus for the occupant and does not feel bothersome.

[Example 2]
Next, a second embodiment of the vehicle head-up display device according to the present invention will be described with reference to the drawings of FIGS.
As shown in FIG. 7, the vehicle head-up display device 1B according to the second embodiment includes a wiper switch 11, a sunshine sensor 13, a display controller (luminance control means) 14, a display device (display means) 15, and an electronic device. And a control device (ECU) 20.

Since the wiper switch 11, the sunshine sensor 13, and the display device 15 are the same as those of the first embodiment, description thereof is omitted.
The display controller 14 determines information to be displayed based on an input signal from a travel control device (not shown) or the like (for example, the vehicle speed of the host vehicle, a right / left turn instruction, presence / absence of a preceding vehicle, etc.) and outputs the information to the display device 15. . The display controller 14 controls the luminance of the display unit corresponding to the information to be displayed based on the input signal from the ECU 20.

The ECU 20 includes a wiper operation determination unit (wiper operation determination unit) 21, a day / night determination unit 24, and a wiping unit / non-wiping unit determination unit 25.
Since the wiper operation determination unit 21 and the day / night determination unit 24 are the same as those of the first embodiment, description thereof will be omitted.

  As shown in FIG. 9, the wiping unit / non-wiping unit discriminating unit wipes each part of the display unit 104 displayed on the display area (combiner) 100 provided on the windshield 101 with a blade rubber (not shown). It is determined whether it is a part belonging to the area (hereinafter referred to as wiping unit) 111 or a part belonging to the region (hereinafter referred to as non-wiping part) 112 that is not wiped, and the determination result is output to the display controller 14. In the second embodiment, the wiping part 111 means the inside of the wiping area, and the non-wiping part 112 means the outside of the wiping area. Since the blade rubber operating range and the position of the display area 100 are known in advance, the xy coordinates are set for the display area 100 in the same manner as in the first embodiment, and the boundary between the wiping portion and the non-wiping portion is defined as xy. By obtaining on the coordinates and specifying each part of the display unit 104 on the xy coordinates, a part belonging to the wiping unit 111 and a part belonging to the non-wiping unit 112 in the display unit 104 can be discriminated. .

Next, the brightness control of the display unit executed in the display controller 14 will be described.
Raindrops are attached to the portion of the windshield 101 that has not been wiped off by the blade rubber, that is, the unwiped portion, and external light is scattered by the raindrops. Therefore, when the wiping part 111 and the non-wiping part 112 exist in the display area 100, since the raindrop exists on the outer surface of the windshield 101 of the non-wiping part 112, the brightness of the background in the non-wiping part 112 is the wiping part. It becomes larger (brighter) than the luminance of the background at 111. Here, as is generally done conventionally, when the brightness of the display unit 104 in the wiping unit 111 and the non-wiping unit 112 is the same, the apparent brightness of the display unit 104 in the non-wiping unit 112 is The brightness of the display unit 104 in the wiping unit 111 is relatively smaller than that of the display unit 104, so that it becomes difficult to see (see FIG. 8A).

  FIG. 9A is an image diagram at this time. In the figure, reference numeral 101 denotes a windshield, reference numeral 102 denotes an instrument panel, reference numeral 111 denotes a wiping portion, reference numeral 112 denotes a non-wiping portion, and reference numeral 104a denotes a vehicle speed of the host vehicle. , A display unit 104b is a display unit indicating a left turn display, and a display unit 104c is a display unit indicating the presence of a preceding vehicle (hereinafter, the display unit 104 when there is no need to distinguish the display units 104a to 104c individually). ).

  Therefore, in the vehicle head-up display device 1B of the second embodiment, when the wiper is operated, the brightness of the display unit 104 in the non-wiping unit 112 is set to the display unit 104 in the wiping unit 111 as shown in FIG. The apparent brightness of the display unit 104 in the non-wiping unit 112 is made equal to the brightness of the display unit 104 in the wiping unit 111. FIG. 9B is an image diagram at this time, whereby the display unit 104 in the non-wiping unit 112 is prevented from becoming difficult to see.

  Further, as shown in FIG. 10, the brightness of the background in the display area 100 is different between the daytime and the nighttime, and the brightness of the background at night is higher than the brightness of the background during the daytime in both the wiping unit 111 and the non-wiping unit 112. Becomes smaller. Further, the brightness difference between the background brightness in the non-wiping unit 112 and the background brightness in the wiping unit 111 is larger in the brightness difference g2 at night than in the daytime (f2 <g2).

  Therefore, in the first embodiment, the brightness of the wiping unit 111 and the non-wiping unit 112 in the daytime and nighttime is set to a predetermined value based on an experience value or the like, and the luminance difference f2 during the day based on these set values. And a luminance difference g2 at night is set in advance. Then, when setting the luminance of the display unit 104 in the non-wiping unit 112 to be larger than the luminance of the display unit 104 in the wiping unit 111, the luminance difference f2 is applied in the daytime, and the luminance difference g2 in the nighttime. Shall be applied. Thereby, the apparent luminance of the display unit 104 in the non-wiping unit 112 can be made equal to the luminance of the display unit 104 in the wiping unit 111 regardless of the difference between daytime and nighttime (a = b = c = D).

Next, the display unit luminance control in the second embodiment will be described with reference to the flowchart of FIG. The display unit luminance control routine shown in the flowchart of FIG. 11 is repeatedly executed at regular intervals.
First, in step S201, wiper information and display unit information are acquired. The wiper information is ON / OFF of the wiper switch 11, position information of the wiping unit 111 and the non-wiping unit 112, and the display unit information is position information of the display unit 104.

Next, it progresses to step S202 and a wiping part / non-wiping part discrimination | determination process is performed. The wiping unit / non-wiping unit determination process can be realized by determining whether each part of the display unit 104 belongs to the wiping unit 111 or the non-wiping unit 112 as described above.
Next, it progresses to step S203 and it is determined whether the wiper switch 11 is turned ON.
If the determination result in step S203 is “NO” (OFF), the process returns to step S201.
If the determination result in step S203 is “YES” (ON), the process proceeds to step S204, and whether or not the amount of sunshine detected by the sunshine sensor 13 is greater than or equal to a predetermined value set in advance as a threshold for daytime and nighttime. judge.

  If the determination result in step S204 is “YES”, it is determined that it is daytime, the process proceeds to step S205, and non-wiping portion luminance interpolation processing according to the daytime is executed. In the non-wiping unit luminance interpolation process according to the daytime, the luminance of the display unit 104 in the non-wiping unit 112 is set to a value larger than the luminance of the display unit 104 in the wiping unit 111 by the daytime luminance difference f2. (See FIG. 10A).

  On the other hand, when the determination result in step S204 is “NO”, it is determined that it is night, and the process proceeds to step S206, where non-wiping portion luminance interpolation processing according to night is executed. The non-wiping part luminance interpolation processing according to night is realized by setting the luminance of the display unit 104 in the non-wiping unit 112 to a value larger than the luminance of the display unit 104 in the wiping unit 111 by a luminance difference g2 for night. (See FIG. 10B).

  Subsequent to steps S205 and S206, the process proceeds to step S207, where the display controller 14 is set so that the luminance of the display unit 104 in the non-wiping unit 112 is larger than the luminance of the display unit 104 in the wiping unit 111 by the luminance difference f2 or g2. Control and output to the display device 15, and the execution of this routine is temporarily terminated.

  In the vehicle head-up display device 1B according to the second embodiment, the apparent luminance of the display unit 104 in the non-wiping unit 112 is equal to the luminance of the display unit 104 in the wiping unit 111 regardless of the difference between daytime and nighttime. Since it can be made equivalent, the passenger does not feel particularly difficult to see the display unit 104 in the non-wiping unit 112, and there is no sense of incongruity. Therefore, the readability for the display unit 104 is improved. In addition, since only one display device 15 is available, it is not necessary to increase the cost.

  In the second embodiment, when the wiper switch 11 is turned off due to rain during the non-wiping portion luminance interpolation process, the outer surface of the windshield 101 is immediately after the wiper switch 11 is turned off. Since it is sufficiently predicted that raindrops remain, the non-wiping portion luminance interpolation processing is performed until a predetermined time (the time necessary for almost no raindrops on the windshield 101) to elapse after the wiper switch 11 is turned off. Is preferably controlled so as to continue.

  Further, in the second embodiment, the raindrops remaining on the non-wiping unit 112 scatter external light and increase the brightness of the background, thereby eliminating the difficulty of viewing the display unit 104. The luminance of the display unit 104 in the wiping unit 111 is set to be larger than the luminance of the display unit 104 in the wiping unit 111. It is also conceivable that the control is performed so as to be smaller. For example, when there is snow in the non-wiping unit 112 or when ash is piled up, the luminance of the background in the non-wiping unit 112 decreases, and the apparent luminance of the display unit 104 in the non-wiping unit 112 increases relatively. It seems to be bright and dazzling. In this case, the apparent luminance of the display unit 104 in the non-wiping unit 112 is reduced by making the luminance of the display unit 104 in the non-wiping unit 112 smaller than the luminance of the display unit 104 in the wiping unit 111. It can be made equivalent to the luminance of the display unit 104 in FIG.

  Further, in the first embodiment described above, the brightness of the display unit 104 is controlled so that the display unit 104 in the overlapping unit 105 and the display unit 104 in the non-overlapping unit 106 appear to be equivalent. Then, the luminance of the display unit 104 is controlled so that the display unit 104 in the non-wiping unit 112 and the display unit 104 in the wiping unit 111 appear to be equivalent, but the color is replaced with the luminance control. It is also possible to equalize the appearance of the display unit 104 by controlling brightness and shade.

BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram in Example 1 of the head-up display apparatus for vehicles which concerns on this invention. FIG. 10 is a diagram illustrating a method for calculating an overlapping area where a display area and a wiper overlap in the first embodiment. It is a figure explaining the difference in the apparent brightness of the display part in an overlap part when the overlap part brightness | luminance interpolation process is implemented in Example 1 and the case where it is not implemented. It is an image figure when the overlapping part brightness | luminance interpolation process is implemented in Example 1, and when not implemented. In Example 1, it is a figure explaining the difference in the brightness | luminance in the daytime and nighttime. 6 is a flowchart illustrating display unit luminance control according to the first exemplary embodiment. It is a block diagram in Example 2 of the head-up display device for vehicles which concerns on this invention. It is a figure explaining the difference in the apparent brightness of the display part in a non-wiping part by the case where non-wiping part brightness | luminance interpolation processing is implemented in Example 2, and the case where it is not implemented. It is an image figure when the non-wiping part brightness | luminance interpolation process is implemented in Example 2, and when not implemented. In Example 2, it is a figure explaining the difference in the brightness | luminance in the daytime and nighttime. 12 is a flowchart illustrating display unit luminance control in the second embodiment.

Explanation of symbols

1A, 1B Vehicle head-up display device 15 Display device (display means)
21 Wiper operation determination unit (wiper operation determination means)
22 Wiper position detection unit (wiper position detection means)
23 Overlap area calculation unit (overlap area calculation means)
25 Wiping part / non-wiping part discrimination part (discrimination means)
100 display area 101 windshield 103 wiper arm (wiper)
104, 104a to 104c Display unit 111 Wiping unit (wiping region)
112 Non-wiping area (non-wiping area)

Claims (5)

In a vehicle head-up display device that displays information in a display area set on a windshield of a vehicle,
Display means for displaying predetermined information as a display unit in the display area;
Wiper operation determining means for determining whether the wiper is operating;
Wiper position detecting means for detecting the position of the wiper on the windshield;
An overlapping area calculating means for calculating an overlapping area where the wiper and the display area overlap based on the output of the wiper position detecting means;
And when the wiper operation determining means determines that the wiper is operating, the display means displays the brightness of the display unit in an overlapping area where the wiper and the display area overlap with each other. The vehicle head-up display device is characterized by being different from the luminance of the display unit in a non-overlapping region where the two do not overlap.   The vehicle head-up display device according to claim 1, wherein the luminance of the display unit in the overlapping region is made smaller than the luminance of the display unit in the non-overlapping region. In a vehicle head-up display device that displays information in a display area set on a windshield of a vehicle,
Display means for displaying predetermined information as a display unit in the display area;
Wiper operation determining means for determining whether the wiper is operating;
Discriminating means for discriminating between the display unit located in the wiping area of the wiper and the display unit located outside the wiping area;
And the display means compares the brightness of the display section located in the wiping area with the brightness of the display section located outside the wiping area when the wiper action determination means determines that the wiper is operating. And a vehicle head-up display device.   4. The vehicle head-up display device according to claim 3, wherein a luminance of the display unit located outside the wiping area is made larger than a luminance of the display unit located within the wiping area. 5.   The process of making the luminance of the display unit located in the wiping area different from the luminance of the display unit located outside the wiping area is continued for a predetermined time after the wiper is stopped. Item 5. The vehicle head-up display device according to Item 3 or Item 4.

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