JP5784398B2 - Display control method - Google Patents

Description

  Embodiments described herein relate generally to an in-vehicle video display control apparatus having a brightness adjustment function.

  There is an information distribution and display system that provides video, graphics, text information, and audio information to passengers on a railway vehicle. In this system, a video display device is provided in a railway vehicle, and video / graphic / character information is provided to passengers in the vehicle. There is also a monitoring system technology for grasping the operation state of railway vehicles.

  In addition, a technology for adjusting the image quality in accordance with the surrounding situation has been developed for in-vehicle video display devices and stationary video display devices.

JP 2009-25533 A JP 2001-125556 A

  As a display installed in a railway vehicle, there is a display used for a driver to operate a train, and there is a display for providing information to passengers with images. In a railway vehicle in which such a display is installed, the brightness changes depending on the season, time zone, weather, and travel location, so it is conceivable that the visibility of an image displayed depending on the surrounding environment is lowered.

  Therefore, an object of the present embodiment is to provide an in-vehicle video display control device that can prevent the video visibility from being lowered and can be effectively used.

Display control method according to the embodiment is a display control method for controlling the brightness of the display mounted on a vehicle, obtain the status information of the brightness information and the vehicle surroundings sensor mounted on the vehicle is detected And determining the brightness level of the display based on the acquired ambient brightness information and vehicle state information, controlling the brightness of the display based on the determined brightness level, and emergency information When there is an input, the brightness level of the display is controlled to be switched alternately between two different levels.

It is a figure for demonstrating the various surrounding environment of the train to which the display control apparatus which is embodiment of this indication was applied. It is a figure which shows schematic structure of the display apparatus provided with the display control apparatus which is embodiment. It is explanatory drawing which shows the example by which a video is displayed on a display by the display control apparatus shown in FIG. It is a figure which shows the example which installed the display control apparatus which is embodiment in the train. It is a figure which shows the other example which installed the display control apparatus which is embodiment in the train.

  Hereinafter, embodiments will be described with reference to the drawings. FIG. 1 shows examples of various environments in which the train TR is placed. As shown in the figure, the train TR can take a state ST1 located in the station, a state ST2 that travels in a clear environment in the suburbs, a state ST3 that travels in a tunnel, a state ST4 that travels at night, and the like. .

  Here, if the brightness of the display of the display device DS in the vehicle is always constant, it may be difficult for the passenger or the driver to visually recognize the image displayed on the display. For this reason, it is preferable to appropriately adjust the brightness of the display according to the surrounding environment.

  For example, in a dark environment such as in a station premises, in a tunnel, or at night, the brightness of the display is slightly reduced. Therefore, in such a case, the display is dimmed and the luminance of the input video signal is simultaneously adjusted based on the external brightness information and various vehicle state information.

  As described above, it is desirable that the brightness of the display in the train is adaptively changed according to the surrounding environment to maintain good visibility.

  FIG. 2 shows an example of a schematic configuration of the display device DS including the display control device 10 that adjusts the brightness of the display 14 according to the surrounding environment. In the environment information acquisition unit 11, in addition to a brightness signal indicating brightness output from an optical sensor using a photodiode, a photoelectric element, or the like, the content of the driver's operation of an HMI (Human Machine Interface) such as an operation lever. An operation signal to be shown and a vehicle state signal such as speed information are also input (hereinafter, information input to the environment information acquisition unit 11 is referred to as environment information).

  Examples of operation signals include driving command signals indicating acceleration, deceleration, and stop related to vehicle driving. In addition to signals indicating brightness and operation signals, environmental information includes information on doors installed in the vehicle. Open / close information, position information and speed information obtained from the rotational speed of the wheels output from the speed generator, accident information received via a wireless LAN access point on the ground, date and time information, and provision to passengers Commercial information can be included. Note that the position information can also be obtained by receiving a signal output from a ground element installed on a route by a vehicle upper element mounted on the vehicle.

  Environmental information such as a brightness signal collected by the environmental information acquisition unit 11 is transferred to the brightness control unit 12. The environment information acquisition unit 11 and the brightness control unit 12 can be connected via a communication path such as a wireless LAN or a wired LAN. For example, both the environment information acquisition unit 11 and the brightness control unit 12 are included in the display device DS. It is conceivable to adopt a wired LAN when installed in the network, and to adopt a wireless LAN when the environment information acquisition unit 11 is provided at a position different from the display device DS in the vehicle.

  The brightness controller 12 controls the brightness of the display 14 so that the visibility is not lowered when environmental information is input. Specifically, the brightness level of the backlight 13 provided on the back side or the side surface side of the display 14 and the brightness level of the video displayed on the display 14 are adjusted. Thereby, the brightness of the display 14 is adaptively controlled according to the surrounding environment where the display 14 is installed, and the displayed video is easy to see for the viewer.

  In the above description, both the brightness level of the backlight 13 and the luminance level of the video displayed on the display 14 are controlled. However, either one of the levels may be controlled.

  On the other hand, there are cases where a passenger is not on the train or a forwarding operation is performed. In such a case, the brightness control unit 12 receives the passenger number information obtained from the weight detected by the weight sensor provided in the vehicle and the operation command from the driver via the environment information acquisition unit 11. Based on the passenger number information and the operation command, it is recognized that no passenger is on board or the forward driving is being performed, and as a result, the brightness level of the backlight 13 is set to the minimum level, the display It is possible to reduce unnecessary power consumption (power saving) by setting the luminance level of the video displayed on the screen 14 to the lowest level.

  Further, the brightness control unit 12 may control to stop the display on the display 14 instead of setting the brightness level and the luminance level to the lowest level.

  The luminance adjusting unit 15 converts the luminance signal Y and the color difference signals U and V included in the input video signal into image signals R, G, and B, and outputs them to the display 14. The luminance signal Y is corrected in accordance with the input luminance level correction instruction, and the image signals R, G, and B are obtained using the luminance signal Y thus configured.

  As shown in FIG. 2, the brightness control unit 12 includes a memory 122 that stores a database. In this database, data for the brightness control unit 12 to control the brightness of the display 14 is stored. It is remembered. As an example, there is a table in which the brightness signal output from the optical sensor is associated with the brightness level of the backlight 13 and the coefficient for correcting the brightness level of the video displayed on the display 14. 13 brightness levels are divided into 3 levels. When the brightness signal indicates a bright environment such as a suburb, the brightness level of the backlight 13 is set to the highest level of 3 levels, and when the brightness signal indicates a dark environment such as a station premises. Indicates that the brightness level is set to the lowest of the three levels, and the brightness level is set to the intermediate level when the brightness signal is between the above two levels. In this case, the luminance level is increased by one level, and in a dark environment, the luminance level is decreased by one level.

  When the train is in operation, a brightness signal is continuously input from the optical sensor to the brightness control unit 12 via the environment information acquisition unit 11. The brightness control unit 12 compares the input brightness signal with a table stored in the memory 122, and confirms which of the three levels the brightness signal corresponds to.

  First, when the brightness signal indicates a value corresponding to the middle of the three levels, the brightness control unit 12 instructs the backlight 13 to turn on at an intermediate brightness level, and the brightness adjustment unit 15 In response to this, an instruction is issued to display the video on the display 14 using the luminance value of the input video signal as it is. As a result, an image such as a commercial is displayed on the display 14 with a standard brightness.

  After that, when the interior of the vehicle becomes dark, for example, when the train stops at the station, the value of the brightness signal output from the optical sensor decreases, and when the value becomes three levels, the brightness control unit 12 refers to the table, The backlight 13 and the brightness adjusting unit 15 are controlled so that the brightness level of 13 is set to the lowest level and the brightness value of the video signal is lowered by one level. As a result, the display 14 displays a video such as a commercial whose brightness is reduced in accordance with a dark environment.

  Then, the train departs, the value indicated by the brightness signal output from the optical sensor returns to a value corresponding to the middle, and the image displayed on the display 14 is displayed with standard brightness. Thereafter, when the train moves further and there is no high-rise building that blocks light in the suburbs, etc., and changes to a bright environment, the lightness signal output from the light sensor becomes a high level in three stages. As a result, the brightness control unit 12 refers to the table, the brightness level of the backlight 13 is set to the highest level, and the brightness level of the video signal displayed on the display 14 is increased by one level. An instruction is given to the luminance adjustment unit 15. As a result, an image such as a commercial whose brightness is increased in accordance with a bright environment is displayed on the display 14.

  Thus, since the brightness of the image displayed on the display 14 is changed in consideration of the visibility according to the brightness around the display device DS detected by the optical sensor, the passenger is in an environment where the train travels. It is possible to enjoy commercials and other images without being affected.

  Here, in the above description, the brightness control unit 12 controls the backlight 13 and the brightness adjustment unit 15 in real time according to the brightness signal output from the optical sensor. For example, the train moves at high speed. In such a case, the brightness in the vehicle may change frequently. In this case, if the brightness of the video displayed on the display 14 is changed in real time, it may be difficult to see the video. . Therefore, the threshold value of the train traveling speed is stored in the memory 122 in advance, and when the speed information obtained from the output of the speed generator exceeds the threshold value of the traveling speed, the brightness control unit 12 has a predetermined time, for example, An instruction for the backlight 13 and the luminance adjustment unit 15 is determined by obtaining an average value of the brightness signals for two minutes and comparing the average value with the table.

  In addition, multiple thresholds are set for driving speed, and the average value is calculated in real time when driving at low speed, every 2 minutes when driving at medium speed, and the average value is calculated every 4 minutes when driving at high speed. 13 and the luminance adjustment unit 15 may be instructed. In this case, even if there is a change in the traveling speed of the train, it becomes possible to control the brightness of the image displayed on the display 14 without giving the passengers a sense of incongruity, and it is possible to further improve the visibility. Become.

  When there is an operation signal indicating sudden braking such as sudden braking, the brightness is once reduced to be reduced, and then the backlight 13 or the like so as to follow the surrounding brightness gradually when the train speed is stabilized. The brightness adjusting unit 15 may be controlled.

  Next, another example regarding display control of the display 14 performed by the brightness control unit 12 will be described.

  3A and 3B show examples of images displayed on the display 14 when the brightness control unit 12 receives accident information via the environment information acquisition unit 11.

  Similar to the above description, the brightness control unit 12 controls the backlight 13 and the brightness adjustment unit 15 based on the brightness signal output from the optical sensor, and the brightness of the video such as a commercial displayed on the display 14. When accident information is input to the brightness control unit 12 via the environment information acquisition unit 11 when adjusting the brightness, the brightness control unit 12 displays the accident information displayed on the display 14 in a flash manner. In addition, control is performed so that the maximum level and the minimum level at which the luminance adjustment unit 15 can take the luminance level are switched at a predetermined time interval, for example, 2 seconds. FIG. 3A shows accident information displayed on the display 14 at this time.

  On the other hand, FIG. 3B is another example when displaying accident information, and only a part of the area of the display 14 is flash displayed. In this case, the brightness control unit 12 Thus, control is performed to switch the luminance level between the maximum level and the minimum level for a predetermined pixel in the display area of the display 14. As a result, as shown in FIG. 3B, a part of the upper right area of the display 14 is flash-displayed.

  As described above, when emergency information such as accident information is input, the luminance level is controlled so that the passenger's attention can be directed to the display 14, so that the display 14 can be used efficiently together with the visibility. be able to.

  In addition, when it is recognized that the surroundings are dark according to the environment information and accident information is acquired, the brightness of the display 14 can be increased and used as illumination.

  Now, another method of using the memory 122 provided in the display device DS will be described.

  The train is turned around and may repeatedly pass through the same area. For this reason, when the video brightness displayed on the display 14 is adjusted according to the environment, the train position and the adjustment amount can be stored in the memory 122 as history data. At this time, date information may be stored together with the adjustment amount. Thereby, it is possible to collect the data regarding the brightness of the railway.

  The history data stored in the memory 122 can be used as a usage history of the display 14, for example. This use history can be used as a guideline for the replacement time and inspection time of the display 14.

  Then, the example at the time of mounting the display apparatus DS of this invention in a vehicle is demonstrated.

  FIG. 4 shows a state in which the display device DS shown in FIG. 2 is installed on the upper part of the door of the vehicle. In such a case, the optical sensor is installed in the vicinity of each display device DS, and the brightness of the display 14 is controlled for each display device DS. Even if the vehicle is the same, the brightness varies depending on the location. Therefore, with such a configuration, it is possible to control the brightness suitable for each display device DS.

  On the other hand, FIGS. 5A and 5B show an example in which the brightness control unit 12 is made independent of the display control device 10 of FIG. 2 and installed at a position different from the display device DS. Show.

  In FIG. 5A, the brightness control unit 12 is provided in one vehicle of a train of trains, for example, the leading vehicle. In this case, the brightness control unit 12 transmits the display device DS installed in each vehicle via a backbone LAN installed in the train. In the example shown in FIG. 5A, only one light sensor may be provided in the vicinity of the brightness control unit 12, or a vehicle provided with the brightness control unit 12 may receive a plurality of locations. Good. In the case where a plurality of photosensors are provided, the brightness control unit 12 obtains an average value of the brightness signal from each photosensor, and controls the brightness for the display 14 of each display device DS based on the average value. .

  On the other hand, FIG. 5B shows an example in which the brightness control unit 12 is installed in each vehicle. In this case as well, only one optical sensor is installed in the vicinity of the brightness control unit 12 provided in each vehicle. Alternatively, a plurality of locations may be installed in each vehicle.

  5A and 5B, the number of installed brightness control units 12 can be reduced as compared to FIG. 4, and the display is provided as a device separate from the display device DS. The cost of the device DS can be reduced.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
The description of the scope of claims at the beginning of the application of the present application will be added below.
[C1]
An environmental information acquisition unit that captures external brightness information and vehicle state information;
An output from the environment information acquisition unit is input, and a brightness control unit that outputs a signal for adjusting the brightness of the display,
The said brightness control part is a vehicle-mounted video display control apparatus which controls the said display as an object of the brightness strength adjustment state and / or a power saving state based on the said external brightness information and vehicle state information.
[C2]
The on-vehicle video display control device according to [C1], wherein the environment information acquisition unit and the brightness control unit turn off the display state of the display based on a signal indicating forwarding and / or passenger absence.
[C3]
When the speed information included in the vehicle state information indicates high speed, the change in the external brightness information is integrated and used so that the integration amount increases in accordance with the speed. Video display controller.
[C4]
The brightness control unit outputs a control signal for dimming the display based on the external brightness information and vehicle state information, and outputs a control signal for simultaneously adjusting the luminance of the input video signal [ In-vehicle video display device according to C1].
[C5]
The on-vehicle video display device according to [C1], wherein the environment information acquisition unit and the brightness control unit control the brightness of the display to a blinking state when the abnormality information is received.

TR ... Train, 11 ... Environmental information acquisition unit, 12 ... Brightness control unit, 13 ... Backlight, 14 ... Display, 15 ... Brightness adjustment unit.

Claims (5)

A display control method for controlling the brightness of a display mounted on a vehicle,
Obtaining ambient brightness information and vehicle state information detected by a sensor mounted on the vehicle;
The brightness level of the display is determined based on the acquired ambient brightness information and the vehicle state information,
Control the brightness of the display based on the determined brightness level,
Furthermore, when an emergency information is input, the brightness level of the display is controlled to be alternately switched between two different levels.
A display control method characterized by the above. The display control method according to claim 1, wherein the control for alternately switching the brightness level of the display at two different levels according to the input of the emergency information is performed in a partial area of the display. . The vehicle state information is speed information. Based on the speed information, an average value of the brightness information detected by the sensor at a predetermined time is obtained, and based on the obtained average value of the brightness information. The display control method according to claim 1, wherein brightness of the display is controlled. A plurality of sensors are mounted on the vehicle, and a brightness level of the display is determined based on an average value of brightness information detected by the plurality of sensors and state information of the vehicle. The display control method according to claim 1. The display control method according to claim 1, wherein the display is controlled to be turned off when information indicating at least one of forwarding and passengers is absent.

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