JP2008030518A - Device for showing information in front of vehicle in night - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a device for showing the information in front of a vehicle in the night, which device can automatically adjust the luminance of a display portion according to the change of the various running conditions of the vehicle. <P>SOLUTION: The information showing the conditions of the vehicle during running is collected. The running conditions of the vehicle are analyzed based on the collected information. The luminance of the display portion is regulated based on the analyzed results. For example, the information showing the conditions of the vehicle includes the information of a vehicle speed, the operating information of direction indicators, the information of the beam direction of head lamps, and the operating information of a bake. Further, the luminance of the display portion can be changed according to a required changing rate in regulating the luminance. In addition, the changing rate can be determined according to the combination of the type of the running conditions of the vehicle before the change and the type of the running conditions of the vehicle after the change respectively. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an apparatus for providing information on the front side of a vehicle such as discovery of a pedestrian at night to a driver. It is particularly suitable for use in large commercial vehicles such as trucks and buses.

  There has been proposed a night front information providing apparatus that provides information on the front of a vehicle such as discovery of a pedestrian at night to a driver (see, for example, Patent Documents 1 to 3). This device includes a display unit such as a head-up display (HUD), and displays information ahead of the vehicle on this display unit.

JP-A-8-175228 JP 9-43532 A JP 2003-291688 A

  In the above apparatus, the brightness of the display unit such as the HUD can be manually adjusted. However, it is generally assumed that such manual brightness adjustment is performed before the start of operation. I do not expect to do it.

  However, it is useful to adjust the brightness of the display unit in accordance with changes in various situations during driving. For example, the situation where the headlight is a low beam and the vehicle is traveling straight at a vehicle speed that is close to the upper limit of the legal speed is the situation that requires the night front information providing device, and the brightness of the display unit is high under such circumstances It is desirable.

  On the other hand, when turning right or left at an intersection or changing lanes, it is necessary to check the surroundings of the vehicle, so the necessity of a night information providing device is low, and the brightness of the display is In such a situation, it is desirable that the brightness of the display unit be low. Further, the necessity of the night front information providing device is low even when the vehicle is stopped, and it is desirable that the luminance of the display unit be low under such circumstances. Alternatively, if the headlamp is traveling with a high beam, the necessity for a night front information providing device is low, and it is desirable that the luminance of the display unit be low under such circumstances.

  In the conventional apparatus, since the brightness adjustment of the display unit is performed manually, it is difficult to adjust the brightness according to such an operation state.

  The present invention has been carried out under such a background, and provides night front information capable of automatically adjusting the luminance of the display unit in accordance with changes in various driving conditions during driving of the vehicle. An object is to provide an apparatus.

  The present invention is a night front information providing device that displays information on the front of a vehicle at night on a display unit. The present invention is characterized by collecting information indicating the state of the vehicle while the vehicle is running. Further, there is provided means for analyzing the running state of the vehicle based on the information and means for adjusting the luminance of the display unit based on the analysis result of the analyzing means.

  For example, the information indicating the state of the vehicle includes vehicle speed information, direction indicator operation information, headlamp beam direction information, and brake operation information.

  According to this, the brightness | luminance of a display part can be adjusted according to the change of the various driving | running | working conditions during driving | operation. For example, in a situation where the headlight is a low beam and the vehicle is traveling straight at a vehicle speed that is close to the upper limit of the legal speed, it is the situation that requires the night front information providing device. Under such circumstances, the brightness of the display unit is increased. can do.

  On the other hand, when turning right or left at an intersection or changing lanes, it is necessary to check the surroundings of the vehicle, so the necessity of a night information providing device is low, and the brightness of the display is The eyes may be dazzled, and the luminance of the display unit can be lowered under such circumstances. Further, the necessity of the night front information providing apparatus is low even when the vehicle is stopped, and the luminance of the display unit can be lowered under such a situation. Alternatively, if the headlamp is traveling with a high beam, the necessity for the night front information providing device is low, and the luminance of the display unit can be lowered under such a situation.

  Furthermore, the means for adjusting may include means for changing the luminance of the display unit according to a predetermined change rate.

  According to this, it is possible to avoid a sharp change in luminance and to change the luminance according to the time required for dark adaptation or bright adaptation of human eyes. Can be avoided.

  The rate of change is preferably determined in accordance with a combination of a type of vehicle traveling state before the change and a type of vehicle traveling state after the change in the changing means.

  For example, depending on the combination of the type of driving situation of the vehicle before the change in luminance and the type of driving condition of the vehicle after the change in luminance, there are combinations that change the luminance from higher to lower. In such a case, there is no problem even if the rate of change is steep, so that the rate of change is steep.

  Or, depending on the combination of the type of driving situation of the vehicle before the change in luminance and the type of driving situation of the vehicle after the change in luminance, even if it is known that the eyes of the driver are somewhat dazzled by the change in luminance, There are also combinations that require urgent increase in luminance. In such a case, a slight change in the driver's eyes is allowed, and the rate of change is steep.

  According to the present invention, it is possible to automatically adjust the luminance of the display unit in accordance with changes in various traveling conditions during driving of the vehicle.

  A night front information providing apparatus according to an embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a driver's cab of a vehicle equipped with the night front information providing apparatus of this embodiment.

  As shown in FIG. 1, the present embodiment is a night front information providing apparatus 1 that displays information in front of a vehicle at night on an HUD 3 that is a display unit. Here, the feature of the night front information providing apparatus 1 of the present embodiment is that it collects information indicating the state of the vehicle while the vehicle is traveling, and analyzes the traveling state of the vehicle based on the information. There is a part 30 and a brightness adjusting part 20 that adjusts the brightness of the HUD 3 based on the analysis result of the traveling state analyzing part 30.

  The vehicle state information includes vehicle speed information from the vehicle speed sensor 10, direction indicator operation information from the direction indicator switch 7, headlamp beam direction information from the headlamp switch 9, and brake switch 6. Includes brake activation information. The brake operation information from the brake switch 6 includes auxiliary brake operation information in addition to main brake operation information such as a disc brake.

  Further, rain information can be obtained by the wiper switch 8. Further, information for identifying day and night by the solar radiation sensor 11 and information for recognizing that the vehicle is traveling in the tunnel can be obtained.

  The night front information providing apparatus 1 displays an infrared image emitted from the body of the pedestrian captured by the camera 4 on the HUD 3 via the projector 2. In addition, when imaging | photography also the surroundings of a pedestrian with the camera 4, infrared rays can be irradiated to the front of a vehicle with the infrared projector 5. FIG.

  Next, the luminance adjustment procedure in the luminance adjustment unit 20 will be described with reference to FIG. FIG. 2 is a flowchart showing the luminance adjustment procedure of the luminance adjustment unit 20. As shown in FIG. 2, the brightness adjustment unit 20 is in a parking state (S3) while the power switch is not turned on (S1). In addition, a brightness | luminance is a parking state, ie, a brightness | luminance is "0" and the night front information provision apparatus 1 itself has stopped. However, even when the power switch is turned on (S1) and the night front information providing apparatus 1 is in the operating state, it is identified that the present day is daytime by the information for identifying day and night obtained from the solar radiation sensor 11. Sometimes (S2), too, the brightness is set to the parking state (S3). Alternatively, the power supply may be automatically turned off until the information for identifying day and night obtained from the solar radiation sensor 11 indicates nighttime even when the power switch is turned on. Even during daytime, it is identified as nighttime during tunnel travel.

  The power switch is in the ON state (S1), the information for identifying day and night obtained from the solar radiation sensor 11 indicates the night (S2), and the vehicle speed is 0 km / h to V1 (for example, 30 km / h) ( S4) When the operation of the direction indicator is confirmed by the direction indicator switch 7 (S5), the luminance is set to the right or left turn state (S6). The luminance in the right / left turn state is the luminance level “1” when the highest luminance state is set to the luminance level “5”. In the right / left turn state, the necessity of the night front information providing device 1 is low and driving is performed. Consideration is taken so that the eyes of the person will not be dazzled by the brightness of HUD3.

  Further, when the vehicle speed is 0 km / h or more and V1 or less (S4) and the operation of the direction indicator is not confirmed by the direction indicator switch 7 (S5), the luminance is set to a low speed state (S8). The luminance in the low speed state is the luminance level “2”. In the low speed state, the necessity of the night front information providing apparatus 1 is low, and consideration is given so that the eyes of the driver are not obscured by the brightness of the HUD 3. However, if it is determined that it is raining by detecting the operation of the wiper with the wiper switch 8 (S7), the brightness level is "+1" because the visibility is worse than in fine weather (S9). .

  When the vehicle speed is higher than V1 (S4), when the operation of the direction indicator is confirmed by the direction indicator switch 7 (S10), the luminance is changed to the lane change state (S11). The luminance in the lane change state is the luminance level “1”, and in the lane change state, the necessity of the night front information providing device 1 is low, so that the driver's eyes are not dazzled by the brightness of the HUD 3 Yes.

  Further, if the vehicle speed is higher than V1 (S4), the operation of the direction indicator is not confirmed by the direction indicator switch 7 (S10). At this time, if sudden deceleration is confirmed by the brake switch 6 or the vehicle speed sensor 10 ( S12), the brightness is set to a rapid deceleration state (S13). The brightness in the sudden deceleration state is the brightness level “1”, and in the sudden deceleration state, the necessity for the night front information providing device 1 is low, so that the driver's eyes are not obscured by the brightness of the HUD 3. Yes.

  If the vehicle speed is higher than V1 (S4), the operation of the direction indicator is not confirmed (S10), the sudden deceleration is not confirmed (S12), and the headlamp switch 9 confirms the low beam ( S14) Since the vehicle is traveling straight on a general road and the night front information providing apparatus 1 is most useful, the brightness is set to the normal state (S15). The luminance in the normal state is the luminance level “5”, which is the highest luminance level.

  Further, the vehicle speed is higher than V1 (S4), the operation of the direction indicator is not confirmed (S10), the sudden deceleration is not confirmed (S12), and the headlamp switch 9 confirms the high beam (S14). Further, if the vehicle speed is V2 (for example, 60 km / h) or more (S16), the brightness is set to a high speed state (S21). The brightness in the high speed state is the brightness level “4”, which is lower than the normal state. This is because, in high speed conditions, the car is mainly driving on a highway, so there is little need to pay attention to the presence of pedestrians. Furthermore, because the headlamp is a high beam, the front can be visually confirmed almost completely. It is. However, as described above, when it is determined that it is raining by the wiper switch 8 (S20), the luminance is incremented by "+1" (S22).

  Further, the vehicle speed is higher than V1 (S4), the operation of the direction indicator is not confirmed (S10), the sudden deceleration is not confirmed (S12), and the headlamp switch 9 confirms the high beam (S14). Further, if the vehicle speed is less than V2 (S16), the brightness is set to the medium speed state (S18). The brightness in the medium speed state is the brightness level “3”, which is lower than that in the high speed state. This is because, in the medium speed state, the road is mainly traveling on a general road, and the need to pay attention to the presence of pedestrians is higher than that on the highway, but the speed is medium and the headlamps are high beams. This is because the front can be completely visually confirmed with a margin. However, as described above, when the wiper switch 8 can determine that it is raining (S17), the brightness is incremented by "+1" (S19). The relationship between the running state and the luminance described above is shown as a list in FIG.

  In addition, the luminance adjustment unit 20 changes the luminance of the HUD 3 according to a predetermined change rate. This rate of change is determined in accordance with the combination of the type of vehicle driving status before the change and the type of vehicle driving status after the change. An example of the change rate list is shown in FIG. In addition, here, in order to make the explanation easy to understand, the explanation is made without considering the extra brightness level at the time of rain.

  In the list of FIG. 4, the rate of change of 100% means a state where the luminance changes instantaneously, and means that the time required for the luminance change takes longer as the percentage value becomes smaller. For example, if the rate of change is 10%, the time required for the luminance change is about 5 seconds. If the rate of change is 30%, the time required for the change in luminance is about 4 seconds. If the change rate is 50%, the time required for the change in luminance is about 3 seconds. If the rate of change is 70%, the time required for the luminance change is about 2 seconds. If the change rate is 90%, the time required for the change in luminance is about 1 second.

  The driving condition of the vehicle before the luminance change is “normal (luminance level 5)”, and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, “medium speed (luminance level 3)”, “high speed”. In the case of (brightness level 4) ", the rate of change is 90%, and the brightness level changes in about 1 second. These changes are changes from high luminance to low luminance (-1 to -3), and the driver's eyes are not likely to be dazzled. Therefore, the changes are made earlier (about 1 second).

  The driving situation of the vehicle before the brightness change is “normal (brightness level 5)”, and the driving situation of the vehicle after the brightness change is “parking (brightness level 0)”, “right / left turn (brightness level 1)”, “lane” In the case of “change (luminance level 1)” and “rapid deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high luminance to low luminance (−4 to −5), and there is no possibility that the driver's eyes will be dazzled. Further, under these circumstances, the driver displays the HUD 3. Since it is necessary to visually check the surroundings of the vehicle without seeing any

  The driving condition of the vehicle before the luminance change is “low speed (luminance level 2)”, and the driving condition of the vehicle after the luminance change is “normal (luminance level 5)”, “medium speed (luminance level 3)”, “high speed”. In the case of (luminance level 4) ", the change rates are 30%, 70% and 50%, respectively, and the luminance level changes in about 2 to 4 seconds. These changes are changes from low luminance to high luminance (+1 to +3), and since the driver's eyes may be dazzled, the change is about 2 to 4 seconds.

  The driving situation of the vehicle before the luminance change is “low speed (luminance level 2)”, and the driving situation of the vehicle after the luminance change is “parking (luminance level 0)”, “right / left turn (luminance level 1)”, “lane” In the case of “change (luminance level 1)” and “rapid deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high luminance to low luminance (-1 to -2), and there is no possibility that the driver's eyes will be dazzled. Further, under these circumstances, the driver displays the HUD3. Since it is necessary to visually check the surroundings of the vehicle without seeing any

  When the driving condition of the vehicle before the luminance change is “medium speed (luminance level 3)” and the driving condition of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 50%. Yes, the brightness level changes in about 3 seconds. This change is a change from low luminance to high luminance (+2), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “medium speed (luminance level 3)” and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, the rate of change is 90%. Yes, the luminance level changes in about 1 second. This change is a change (-1) from high luminance to low luminance, and since there is no possibility that the driver's eyes will be dazzled, it is assumed that the change is early (about 1 second).

  When the driving condition of the vehicle before the luminance change is “medium speed (luminance level 3)” and the driving condition of the vehicle after the luminance change is “high speed (luminance level 4)”, the rate of change is 70%. Yes, the brightness level changes in about 2 seconds. This change is a change from low luminance to high luminance (+1), and the driver's eyes may be dazzled.

  The driving condition of the vehicle before the luminance change is “medium speed (luminance level 3)”, and the driving condition of the vehicle after the luminance change is “parking (luminance level 0)”, “right / left turn (luminance level 1)”, “ In the case of “lane change (luminance level 1)” and “rapid deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high luminance to low luminance (−2 to −3), and there is no possibility that the driver's eyes will be dazzled. Further, under these circumstances, the driver displays the HUD 3. Since it is necessary to visually check the surroundings of the vehicle without seeing any

  When the driving condition of the vehicle before the luminance change is “high speed (luminance level 4)” and the driving condition of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 70%. The brightness level changes in about 2 seconds. This change is a change from low luminance to high luminance (+1), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “high speed (luminance level 4)” and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, “medium speed (luminance level 3)” In each case, the rate of change is 100%, and the luminance level changes instantaneously. This change is a change from high luminance to low luminance (−1 to −2), and since there is no possibility that the driver's eyes will be dazzled, it is assumed to be an instantaneous change.

  The driving situation of the vehicle before the luminance change is “high speed (luminance level 4)”, and the driving situation of the vehicle after the luminance change is “parking (luminance level 0)”, “right / left turn (luminance level 1)”, “lane” In the case of “change (luminance level 1)” and “rapid deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high luminance to low luminance (−3 to −4), and there is no possibility that the driver's eyes will be dazzled. Further, under these circumstances, the driver displays the HUD 3. Since it is necessary to visually check the surroundings of the vehicle without seeing any

  When the driving situation of the vehicle before the luminance change is “parking (luminance level 0)” and the driving situation of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 10%. The brightness level changes in about 5 seconds. This change is a change from the lowest luminance to the highest luminance (+5), and since the driver's eyes are most likely to be dazzled, it is assumed to be the slowest change of about 5 seconds. In addition, even the most gradual change is not a problem because it takes a considerable time for the vehicle to accelerate from the “parking” state to the “normal” state.

  When the driving condition of the vehicle before the luminance change is “parking (luminance level 0)”, and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, “medium speed (luminance level 3)” The change rate is 50% and 30%, respectively, and the luminance level changes in about 3 to 4 seconds. These changes are changes from low luminance to high luminance (+2 to +3), and the driver's eyes may be dazzled, so that the change is about 3 to 4 seconds.

  When the driving situation of the vehicle before the luminance change is “parking (luminance level 0)” and the driving situation of the vehicle after the luminance change is “high speed (luminance level 4)”, the rate of change is 10%. The brightness level changes in about 5 seconds. This change is a change from low luminance to high luminance (+4), and the driver's eyes may be dazzled. Even if such a gradual change occurs, there is no problem because it takes a considerable time for the vehicle to accelerate from the “parking” situation to the “high speed” situation.

  When the driving condition of the vehicle before the luminance change is “right / left turn (luminance level 1)” and the driving condition of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 10%. Yes, the brightness level changes in about 5 seconds. This change is a change from low luminance to high luminance (+4), and the driver's eyes may be dazzled. In addition, such a gradual change is not a problem because it takes a considerable time for the vehicle to accelerate from the “right / left turn” situation to the “normal” situation.

  When the driving condition of the vehicle before the luminance change is “right / left turn (luminance level 1)” and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, the rate of change is 70%. Yes, the brightness level changes in about 2 seconds. This change is a change from low luminance to high luminance (+1), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “right / left turn (luminance level 1)” and the driving condition of the vehicle after the luminance change is “medium speed (luminance level 3)”, the rate of change is 50%. The brightness level changes in about 3 seconds. This change is a change from low luminance to high luminance (+2), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “right / left turn (luminance level 1)” and the driving condition of the vehicle after the luminance change is “high speed (luminance level 4)”, the rate of change is 30%. Yes, the brightness level changes in about 4 seconds. This change is a change from low luminance to high luminance (+3), and the driver's eyes may be dazzled. In addition, such a gradual change is not a problem because it takes a considerable amount of time for the vehicle to accelerate from a “right / left turn” situation to a “high speed” situation.

  The driving condition of the vehicle before the luminance change is “right / left turn (luminance level 1)”, and the driving condition of the vehicle after the luminance change is “parking (luminance level 0)”, “lane change (luminance level 1)”, “ In the case of “sudden deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high brightness to low brightness or the same brightness (-1 to 0), and there is no possibility that the driver's eyes will be dazzled. Since it is necessary to visually check the surroundings of the vehicle without looking at the display of, it is assumed to be an instantaneous change.

  When the driving condition of the vehicle before the luminance change is “lane change (luminance level 1)” and the driving condition of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 70%. Yes, the brightness level changes in about 2 seconds. This change is a relatively large change from low brightness to high brightness (+4), and the driver's eyes may be dazzled. Therefore, a smaller change rate is desirable, but after changing the lane, Since it immediately becomes a “normal” situation, a slight dazzling of the driver's eyes is allowed and the change is about 2 seconds.

  When the driving condition of the vehicle before the luminance change is “lane change (luminance level 1)” and the driving condition of the vehicle after the luminance change is “low speed (luminance level 2)”, the rate of change is 70%. Yes, the brightness level changes in about 2 seconds. This change is a change from low luminance to high luminance (+1), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “lane change (luminance level 1)” and the driving condition of the vehicle after the luminance change is “medium speed (luminance level 3)”, the rate of change is 50%. The brightness level changes in about 3 seconds. This change is a change from low luminance to high luminance (+2), and the driver's eyes may be dazzled.

  When the driving condition of the vehicle before the luminance change is “lane change (luminance level 1)” and the driving condition of the vehicle after the luminance change is “high speed (luminance level 4)”, the rate of change is 30%. Yes, the brightness level changes in about 4 seconds. This change is a change from low luminance to high luminance (+3), and the driver's eyes may be dazzled.

  The rate of change from “lane change” to “normal” was 70% (about 2 seconds), whereas the rate of change from “lane change” to “high speed” was 30% (about 4 seconds). The reason for the loosening is that it is driving on a highway under “high speed” conditions, and there may be pedestrians ahead of the road compared to “normal” driving conditions on general roads. This is because the nature is low.

  The driving situation of the vehicle before the luminance change is “lane change (luminance level 1)”, and the driving situation of the vehicle after the luminance change is “parking (luminance level 0)”, “right / left turn (luminance level 1)”, “ In the case of “sudden deceleration (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high brightness to low brightness or the same brightness (-1 to 0), and there is no possibility that the driver's eyes will be dazzled. Since it is necessary to visually check the surroundings of the vehicle without looking at the display of, it is assumed to be an instantaneous change.

  When the driving situation of the vehicle before the luminance change is “rapid deceleration (luminance level 1)” and the driving situation of the vehicle after the luminance change is “normal (luminance level 5)”, the rate of change is 10%. Yes, the brightness level changes in about 5 seconds. This change is a change from low luminance to high luminance (+4), and the driver's eyes may be dazzled. Even if such a gradual change occurs, there is no problem because it takes a considerable time for the vehicle to accelerate from the “rapid deceleration” situation to the “normal” situation.

  When the driving situation of the vehicle before the luminance change is “rapid deceleration (luminance level 1)” and the driving situation of the vehicle after the luminance change is “low speed (luminance level 2)”, the rate of change is 70%. Yes, the brightness level changes in about 2 seconds. This change is a change from low luminance to high luminance (+1), and the driver's eyes may be dazzled.

  When the driving situation of the vehicle before the luminance change is “rapid deceleration (luminance level 1)” and the driving situation of the vehicle after the luminance change is “medium speed (luminance level 3)”, the rate of change is 50%. The brightness level changes in about 3 seconds. This change is a change from low luminance to high luminance (+2), and the driver's eyes may be dazzled.

  When the driving situation of the vehicle before the luminance change is “rapid deceleration (luminance level 1)” and the driving situation of the vehicle after the luminance change is “high speed (luminance level 4)”, the rate of change is 30%. Yes, the brightness level changes in about 4 seconds. This change is a change from low luminance to high luminance (+3), and the driver's eyes may be dazzled. Even if such a gradual change occurs, there is no problem because it takes a considerable amount of time for the vehicle to accelerate from the "rapid deceleration" situation to the "high speed" situation.

  The driving situation of the vehicle before the luminance change is “rapid deceleration (luminance level 1)”, and the driving situation of the vehicle after the luminance change is “parking (luminance level 0)”, “right / left turn (luminance level 1)”, “ In the case of “lane change (luminance level 1)”, the rate of change is 100%, and the luminance level changes instantaneously. These changes are changes from high brightness to low brightness or the same brightness (-1 to 0), and there is no possibility that the driver's eyes will be dazzled. Since it is necessary to visually check the surroundings of the vehicle without looking at the display of, it is assumed to be an instantaneous change.

  According to the present invention, it is possible to automatically adjust the brightness of the display unit according to changes in various driving conditions during driving of the vehicle, which can contribute to improvement of driving safety at night.

The figure which shows the driver's cab of the vehicle carrying the arousal level detection apparatus of a present Example. The flowchart which shows operation | movement of the brightness | luminance adjustment part of a present Example. The figure which shows the list of the relationship between the driving | running | working state of this Example, and a brightness | luminance. The figure which shows the list of the change rate of the luminance level of a present Example.

Explanation of symbols

1 Night Front Information Providing Device 2 Projector 3 HUD
4 Camera 5 Infrared projector 6 Brake switch 7 Direction indicator switch 8 Wiper switch 9 Headlamp switch 10 Vehicle speed sensor 11 Solar radiation sensor 20 Luminance adjustment unit 30 Travel condition analysis unit

Claims (4)

In the night front information providing apparatus that displays information on the front of the vehicle at night on the display unit,
Means for collecting information indicating the state of the vehicle during traveling of the vehicle and analyzing the traveling state of the vehicle based on the information;
Means for adjusting the luminance of the display unit based on the analysis result of the analyzing means.   The night front information providing device according to claim 1, wherein the information indicating the state of the vehicle includes vehicle speed information, direction indicator operation information, headlamp beam direction information, and brake operation information.   The night front information providing apparatus according to claim 1, wherein the adjusting means includes means for changing the luminance of the display unit according to a predetermined change rate.   4. The night front information providing apparatus according to claim 3, wherein the rate of change is determined in accordance with a combination of a type of traveling state of the vehicle before the change and a type of traveling state of the vehicle after the change in the changing unit.

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