JP4214875B2 - In-vehicle display controller - Google Patents

Description

  The present invention relates to an in-vehicle display control device.

2. Description of the Related Art Conventionally, a simulator device that determines an abnormality in a user's visual acuity has been proposed (see, for example, Patent Document 1). According to the simulator device disclosed in Patent Literature 1, for example, using the simulator device, driving operation tasks such as a winker operation, a brake operation, a start / stop operation, and the like are given. If it is determined that the visual acuity is weak as a result of the driving task, the visual inspection is performed by the display. If the visual acuity is a result, the user is instructed to wear glasses. Put out.
JP-A-9-319291

  Since the conventional simulator device is a device for driving driving of an automobile, it is impossible to determine an abnormality in the driver's visual acuity in a state of getting on an actual vehicle.

  The present invention has been made in view of such a problem, and an object thereof is to provide an in-vehicle display control device that can determine the visual state of a driver while getting on the vehicle.

The vehicle-mounted display control device according to claim 1 is a display unit provided in a vehicle interior, storage means for storing data of an attachment position of the display unit in the vehicle interior, and a body shape for storing information relating to an average body shape of an occupant. Calculated by the information storage means, the calculation means for calculating the distance from the display section to the occupant when the occupant gets in the passenger compartment, based on the data on the attachment position of the display section and the information on the occupant's body shape, and calculated by the calculation means Display means for displaying either a character or a figure readable by a predetermined visual acuity on the display unit based on the determined distance, an instruction unit for instructing an answer to the display content of the display unit, and an instruction from the instruction unit Determination means for determining whether or not the answer to be displayed matches the display content displayed on the display unit, and the display control means determines the sight of the occupant according to the determination result of the determination means And changes repeatedly either the size of characters and symbols displayed on the display unit to.

  As described above, the in-vehicle display control device of the present invention calculates the distance between the occupant and the display unit based on the data on the mounting position of the display unit and information on the occupant's body shape such as the average height and sitting height of the occupant. calculate. Note that the distance between the occupant and the display unit may be calculated in consideration of the seat slide amount and the seat back angle when the occupant having an average body shape is seated on the seat. Based on the calculated distance, characters and symbols having a size corresponding to a predetermined visual acuity are displayed on the display unit.

Thus, for example, the occupant can display on the display unit by displaying characters and symbols having a size corresponding to the legal visual acuity necessary for driving the vehicle on the display unit based on the distance between the occupant and the display unit. If the character or symbol to be identified can be identified, it can be determined that the subject has legal sight, and if the character or symbol cannot be identified, it can be determined that the subject has no legal sight. As described in claim 2, the distance from the display unit to the occupant can be calculated more accurately by inputting the height of the occupant as information related to the occupant's body shape.
In addition, the in-vehicle display control device according to claims 1 and 2 is currently displayed when the displayed content and the answer match, for example, as in a general eyesight measurement method. Change to a character or symbol that is smaller than the current character or symbol, and repeat until the displayed content does not match the answer. The visual acuity corresponding to the size of either the character or the symbol displayed on the display unit when the display content and the answer no longer match can be determined as the visual acuity of the occupant.
On the other hand, if the displayed content displayed first does not match the answer, the character or symbol is changed to a character or symbol larger than the currently displayed character or symbol, and the process is repeated until the displayed content matches the answer. The visual acuity corresponding to the size of either the character or the symbol displayed on the display unit when the display content matches the answer can be determined as the visual acuity of the occupant.

In claim 2, for example, a three-dimensional sitting human body model having a 50th percentile value (JM50) of an adult male body position used for measuring the indoor dimensions of an automobile, as defined in JIS-D-4607 , for example. Using (3DM-JM50), the position of the eyes (hereinafter referred to as eyepoints) in the 3DM-JM50 when the average driving posture of the vehicle is maintained, and the distance from the display unit at that time to the occupant's eyepoint in advance Keep measuring. And, for example, from the ratio of the height of the 3DM-JM50 and the height of the occupant, the position of the eye point when the occupant holds the driving posture is estimated, and by using the position of the estimated eye point, The distance from the display unit to the occupant's eye point can be corrected.

According to a third aspect of the present invention, the vehicle-mounted display control device includes seat position detection means for detecting a seat slide amount and a seat back angle when an occupant gets in the vehicle interior, and the calculation means is detected by the seat position detection means. And a distance correcting means for correcting the distance from the display unit to the occupant using the seat slide amount and the seat back angle.

  That is, the distance from the display unit to the occupant varies depending on the slide amount of the seat on which the occupant is seated and the angle of the seat back. Accordingly, the reference value of the seat slide and the reference value of the seat back angle are stored in advance, the slide amount and the seat back angle from each reference value are detected, and the distance from the display unit to the occupant is corrected. Thus, the distance from the display unit to the occupant can be accurately calculated.

In the on-vehicle display control device according to claim 4 , the display control means changes any of the character and the symbol displayed on the display unit to a size that can be read by the determined visual acuity. For example, when the display unit is used in a navigation device, an audio device, or the like, the characters and symbols displayed on the display unit are changed to a size that can be read by the determined visual acuity. Thereby, the passenger | crew can read the character and symbol of a display part.

The in-vehicle display control apparatus according to claim 5 is characterized in that the instruction means instructs an answer to the display content by voice. As a result, the occupant can answer without changing the riding posture. When the Landolde ring used for visual acuity measurement is displayed on the display unit, the direction of the notch of the Landold ring may be indicated by voice, or the direction of the notch may be indicated by a joystick or the like. .

The in-vehicle display control device according to claim 6 is provided with notifying means for notifying the occupant of visual acuity corresponding to the display content when the determination means determines that the answer and the display content match. Thereby, a passenger | crew can grasp | ascertain a passenger | crew's own visual acuity.

In the in-vehicle display control device according to claim 7 , when the visual acuity corresponding to the display content when the answer matches the display content by the determination means does not satisfy the predetermined visual acuity, the notification means notifies the visual acuity reduction. It is characterized by. For example, a display indicating a reduction in visual acuity or a warning sound is presented on the display unit. Thereby, the passenger | crew can grasp | ascertain that he does not have legal visual acuity.

  Hereinafter, an in-vehicle display control device according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the in-vehicle display control device of the present invention is applied as a function of a navigation device will be described.

  FIG. 1 is a block diagram showing a schematic configuration of a navigation apparatus according to the present embodiment. As shown in the figure, the navigation device 100 of this embodiment includes a position detector 1, a map data input device 6, an operation switch group 7, an external memory 9, a display device 10, a voice input / output device 11, a remote control sensor 12, And a control circuit 8 connected thereto.

  The control circuit 8 is configured as a normal computer, and includes a well-known CPU, ROM, RAM, I / O, and a bus line for connecting these configurations. In the ROM, a program to be executed by the navigation device 100 is written, and a CPU or the like executes predetermined arithmetic processing according to this program. The control circuit 8 reads data stored in the external memory 9 and writes data to the external memory 9.

  The position detector 1 includes a well-known geomagnetic sensor 2, a gyroscope 3, a distance sensor 4, and a GPS receiver 5 for GPS (Global Positioning System) that detects the position of a vehicle based on radio waves from a satellite. Have. Since these have errors of different properties, they are configured to be used while being complemented by a plurality of sensors. Depending on the accuracy of each sensor, the position detector 1 may be configured as a part of the above-described ones, and a steering rotation sensor (not shown), a vehicle speed sensor for each rolling wheel, or the like may be used.

  The map data input device 6 is a device for inputting various data such as map data, background data, and landmark data, and transmits various data in response to a request from the control circuit 8. As a storage medium for storing these various data, a CD-ROM, a DVD-ROM or the like is used depending on the amount of data, but a writable storage medium such as a memory card or a hard disk may be used.

  As the operation switch group 7, for example, a touch switch or a mechanical switch integrated with the display device 10 is used, and various inputs such as a scroll operation of a map displayed on the screen of the display device 10, character input, and key selection are performed. Used for.

  The display device 10 is configured by a liquid crystal display, for example, and is installed near the center console in the vehicle interior. The screen of the display device 10 is generated by the own vehicle position mark corresponding to the current position of the vehicle input from the position detector 1 and the map data, background data, and landmark data input from the map data input device 6. A map around the current position of the vehicle can be displayed.

  Further, the display device 10 adjusts the illuminance of the liquid crystal display to a predetermined illuminance in accordance with an instruction from the control circuit 8. The illuminance adjustment can be manually adjusted by the operation switch group 7.

  The voice input / output device 11 includes an input device and an output device (not shown). The input device recognizes the utterance content of the user and is used for various inputs of the navigation device 100. On the other hand, the output device includes a speaker, an audio amplifier, and the like, and is used for voice guidance and the like.

  When the destination is set from the operation switch group 7 or the remote controller 13 or the like, the navigation device 100 automatically searches for an optimum route from the current position to the destination and displays the searched route on the screen. It has a so-called route guidance function that guides to the destination. As a method for automatically setting the optimum route, for example, a cost calculation method using a well-known Dijkstra method is employed.

  These functions are executed mainly by performing various arithmetic processes by the control circuit 8. That is, when the destination is specified, the control circuit 8 searches for a route using the map data of the map data input device 6, displays the route on the display device 10, and at a branch point or an intersection to turn right or left. Perform map enlargement and voice guidance.

  In addition, the navigation apparatus 100 of this embodiment has a visual acuity measurement function that measures the visual acuity of an occupant while getting on the vehicle. In this visual acuity measurement function, when the occupant's height is input, the distance from the display device 10 to the occupant's eye point is calculated based on the input height, and based on this distance, the statutory law necessary for driving operation is calculated. A Landolde ring having a size corresponding to the visual acuity is displayed on the screen of the display device 10.

  As shown in FIG. 7, the Landolde ring is a reference for visual acuity measurement in Japan, and has a ring shape having a notch in one direction. Usually, visual acuity measurement displays this Landolde ring at a position 5 m away from a person, and at this time, the direction of a notch width of 1.5 mm provided on a ring having a thickness of 1.5 mm and a diameter of 7.5 mm is known. The visual acuity is 1.0.

  Normally, in passenger cars and the like, the occupant cannot get on at a position 5 m away from the display device 10, so the distance from the display device 10 to the occupant's eye point is calculated and the ratio between this calculated distance and 5 m is calculated. Change the size of the Landolde ring. When the Landolde ring that has been changed to a size corresponding to the distance ratio is displayed on the display device 10, the visual acuity is determined to be 1.0 when the notch direction can be read from the occupant's boarding position.

  Also, the Landolde ring having a size corresponding to a visual acuity of 1.0 is changed to a double size so that the Landolt ring corresponding to a visual acuity of 0.5 is obtained. A Landolde ring corresponding to 0.0. Since the legal visual acuity necessary for driving operation is 0.7, the Landolde ring corresponding to a visual acuity of 0.7 is obtained by changing the Landolde ring having a size corresponding to a visual acuity of 1.0 to 0.7 times larger. It becomes.

  Further, in the visual acuity measurement function, after the Landolde ring is displayed on the display device 10, when the direction of the notch of the Landold ring is instructed from the occupant, the method of notching the Landold ring displayed on the display device 10 is instructed. It is determined whether or not the direction matches, and the occupant's visual acuity is determined according to the determination result.

  Next, the processing of the visual acuity measurement function, which is a characteristic part of this embodiment, will be described using the flowcharts shown in FIGS. First, in a step (hereinafter referred to as S) 100 shown in FIG. 4, a visual acuity measurement menu screen is displayed on the display device 10. On this menu screen, two items of “setting” and “sight measurement” are displayed.

  In S200, it is determined whether or not “Setting” on the menu screen is selected. If an affirmative determination is made, the process proceeds to S300, and if a negative determination is made, the process proceeds to S400.

  Here, the setting process in S300 will be described with reference to the flowchart shown in FIG. In this setting process, the distance from the display device 10 to the occupant's eye point is calculated. First, in S310, a setting method selection screen is displayed. On this selection screen, two items of “use default value” and “enter height” are displayed.

  In S320, it is determined whether or not “use default value” on the selection screen is selected. If the determination is affirmative, the process proceeds to S330, and if the determination is negative, the process proceeds to S340. In S330, the occupant is prompted to input sex, and the height corresponding to the input sex is read. The height read here is the average height of men / women in Japan.

  In S340, it is determined whether or not “enter height” on the selection screen is selected. If an affirmative determination is made, the process proceeds to S350, and if a negative determination is made, the process proceeds to S310, and the above-described process is performed. repeat. In S350, the occupant is caused to input the height of the occupant himself. In S360, the distance from the display device 10 to the occupant's eye point is calculated based on the height.

  In addition, for example, it is shown in FIG. 2 using 3DM-JM50 etc. which have the 50th percentile value (JM50) of the adult male body position used when measuring the indoor dimension of a motor vehicle prescribed | regulated to JIS-D-4607. The position of the eye point (P) in the 3DM-JM 50 when maintaining the average driving posture in the vehicle on which the navigation device 100 is mounted, and the distance from the display device 10 to the occupant's eye point (L ) Is measured in advance. Then, from the ratio between the height of the 3DM-JM50 and the height of the occupant, the position of the eye point (P) when the occupant holds the driving posture is estimated, and the position of the estimated eye point (P) is determined. Use to correct the distance (L).

  The seat slide amount (S) and seat back angle (A) when the 3DM-JM 50 holds the driving posture is stored, and the seat slide amount and seed when the occupant actually holds the driving posture is stored. The back angle may be measured to further correct the distance (L). Thereby, a more accurate distance (L) can be estimated.

  In S370, the distance (L) calculated in S360 is stored as registration information. Note that this registration information may be added as a default value.

  When this setting process is completed, in S400 shown in FIG. 4, it is determined whether or not “visual acuity measurement” on the menu screen has been selected. If an affirmative determination is made, the process proceeds to S500, and a negative determination is made. Advances the process to S100.

  Next, the visual acuity measurement process in S500 will be described using the flowchart shown in FIG. At the same time when the visual acuity measurement process is started, the illuminance of the display device 10 is adjusted so as to be the illuminance necessary for visual acuity measurement (for example, about 500 lux).

  In S510, the distance (L) from the display device 10 registered in the setting process described above to the occupant's eye point, the distance (5 m) in general visual acuity measurement as a reference value, and the visual acuity 1.0 at this distance are set. The size of the corresponding Landolde ring (thickness 1.5 mm, diameter 7.5 mm, notch width 1.5 mm) is read.

  In S520, the size of the Landold ring to be displayed on the display device 10 is calculated from the read distance (L) and the reference value. When the process of S520 is executed for the first time, the size of the Landolde ring corresponding to the legal visual acuity (0.7) necessary for driving operation is calculated.

  In S530, a Landolde ring having a size corresponding to the legal visual acuity calculated in S520 is displayed on the display device 10. In addition, as shown in FIG. 3, it displays on the part 10b of the screen 10a of the display apparatus 10. FIG. Thereby, even when map display or route guidance is being executed in the navigation system, visual acuity measurement can be displayed without impairing the original function.

  In S540, it is determined whether or not there is an answer from the occupant regarding the notch direction of the Landolde ring. If the determination is affirmative, the process proceeds to S550. If the determination is negative, the process waits until an answer is received.

  In addition, from a passenger | crew, it is good to make a reply by a voice using the voice input / output device 11, for example. Thus, the occupant can answer without changing the driving posture. Note that the direction of the cutout direction of the Landolde ring may be answered using a joystick or the like.

  In S550, it is determined whether or not the direction of the notch of the Landolde ring displayed on the display device 10 and the direction of the notch answered by the occupant are the same. In S560, the determination result is displayed on the display device 10.

  For example, when the direction of the notch of the Landolde ring displayed on the display device 10 when the processing of S550 is first executed matches the direction of the notch answered by the occupant, it is displayed on the display device 10. The visual acuity corresponding to the size of the Landold ring is displayed on the display device 10 or presented by voice. Thereby, the passenger | crew can grasp | ascertain the passenger | crew's own visual acuity.

  On the other hand, if the direction of the notch of the Landolt ring displayed on the display device 10 when the processing of S550 is first executed does not match the direction of the notch answered by the occupant, the occupant is necessary for the driving operation. Since it does not have legal visual acuity (0.7), the display device 10 displays a visual acuity reduction or presents a warning sound. Thereby, the passenger | crew can grasp | ascertain that he does not have legal visual acuity.

  In S570, it is determined whether or not to continue the visual acuity measurement. That is, the direction of the notch of the Landolde ring displayed on the display device 10 when the process of S550 is first executed and the direction of the notch answered by the occupant are the same as in the method of measuring visual acuity that is generally performed. If it is determined that it is correct, the size of the currently displayed Landold ring is changed to be small, and the above-described processing is repeatedly executed. Then, the process is repeated until the notch direction of the Landolde ring and the notch direction answered by the occupant no longer match. Then, the visual acuity corresponding to the size of the Landolde ring displayed on the display device 10 when it is determined that the display content and the answer do not match is determined as the visual acuity of the occupant.

  On the other hand, if it is determined that the direction of the notch of the Landolt ring displayed on the display device 10 when the processing of S550 is first executed and the direction of the notch answered by the occupant do not match, the current display is performed. The size of the Landold ring is changed to a larger size, and the above processing is repeatedly executed. Then, the process is repeated until the notch direction of the Landold ring matches the notch direction answered by the occupant. Then, the visual acuity corresponding to the size of the Landolde ring displayed on the display device 10 when it is determined that the display content and the answer match is determined as the visual acuity of the occupant.

  Note that the size of the Landolde ring is changed to a size corresponding to the visual acuity ± 0.1 rather than the Landolde ring displayed on the display device 10, for example, as in a general method of measuring visual acuity.

  As described above, the navigation device 100 according to the present embodiment has a visual acuity measurement function that measures the visual acuity of an occupant while getting on the vehicle. Accordingly, the occupant can measure the sight of the occupant himself before starting driving or waiting for a signal. As a result, when the legal visual acuity is not satisfied, the use of glasses can be recommended, or the occupant can be alerted to refrain from driving.

  The characters and symbols displayed on the display device 10 in the visual acuity measurement are not limited to the Landold ring as in the present embodiment, but an E character type snellen index used for visual acuity measurement in the United States or the like, or characters such as hiragana characters. Or may be used to measure visual acuity. Further, not only visual acuity measurement but also measurement of color weakness may be performed simultaneously.

(Modification 1)
In the present embodiment, the distance from the display device 10 to the occupant's eye point is derived from the height, but for example, the size of a characteristic part of the occupant's face (for example, the size of the eyes) by an in-vehicle camera or the like. And the distance from the display device 10 to the occupant's eye point may be estimated from the size of the captured characteristic part. Thereby, a visual acuity measurement can be started, without operating the height input by a passenger | crew.

(Modification 2)
When the display device 10 is used in a navigation device, for example, an audio device or the like as in this embodiment, the characters and symbols displayed on the display device 10 may be changed to a size that can be read by the determined visual acuity. . Thereby, the passenger | crew can read the character and symbol of a display part.

(Modification 3)
In the present embodiment, the size of the Landolde ring displayed on the display device 10 is automatically changed according to the answer by the occupant. However, the size of the Landolde ring displayed on the display device 10 is arbitrarily set. In addition, the occupant may be taught the visual acuity corresponding to the Landolde ring having the set size. Thereby, a passenger | crew's own visual acuity can be grasped | ascertained.

(Modification 4)
The display device 10 is not only installed near the center console in the vehicle interior, but may also be a display installed in a meter cluster in the vehicle interior or a head-up display (HUD) displayed on a windshield or the like. Good.

(Modification 5)
In the present embodiment, when the legal visual acuity is not satisfied, the display device 10 displays a decrease in visual acuity or presents a warning sound. However, when the vehicle is stopped, the driving operation of the vehicle is performed. You may stop the action | operation of the apparatus (for example, accelerator pedal etc.) which concerns.

It is a block diagram which shows schematic structure of the navigation apparatus concerning embodiment of this invention. It is the figure which showed the distance (L) from the display apparatus 10 to a passenger | crew's eye point (P) concerning embodiment of this invention. It is an image figure at the time of displaying a Landold ring on a part 10b of the screen 10a of the display device 10 according to the embodiment of the present invention. It is a flowchart which shows the flow of a process of the visual acuity measurement function concerning embodiment of this invention. It is a flowchart which shows the flow of a setting process concerning embodiment of this invention. It is a flowchart which shows the flow of a visual acuity measurement process concerning embodiment of this invention. It is a figure which shows the Landolde ring concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Position detector 6 Map data input device 7 Operation switch group 8 Control circuit 9 External memory 10 Display device 11 Voice input / output device 12 Remote control sensor 13 Remote control device 100 Navigation device

Claims (7)

A display unit provided in the passenger compartment;
Storage means for storing data of the mounting position of the display unit in the vehicle interior;
Body shape information storage means for storing information on the average body shape of the occupant;
Calculation means for calculating a distance from the display unit to the occupant when the occupant gets in the vehicle interior based on the data on the attachment position of the display unit and information on the occupant's body shape;
Based on the distance calculated by the calculating means, display control means for displaying any of characters and figures readable by a predetermined visual acuity on the display unit ;
Instruction means for instructing an answer to the display content of the display unit;
A determination means for determining whether or not the answer instructed by the instruction means matches the display content displayed on the display unit;
The in-vehicle display characterized in that the display control means repeatedly changes the size of any of the characters and symbols displayed on the display unit until the sight of the occupant is determined according to the determination result of the determination means Control device. A display unit provided in the passenger compartment;
Storage means for storing data of the mounting position of the display unit in the vehicle interior;
An input means for inputting the height of the passenger in the passenger compartment as information relating to the body shape of the passenger ;
Calculation means for calculating a distance from the display unit to the occupant when the occupant gets in the passenger compartment based on the data on the mounting position of the display unit and information on the occupant's body shape;
Based on the distance calculated by the calculating means, display control means for displaying any of characters and figures readable by a predetermined visual acuity on the display unit ;
Instruction means for instructing an answer to the display content of the display unit;
A determination means for determining whether or not the answer instructed by the instruction means matches the display content displayed on the display unit;
The in-vehicle display characterized in that the display control means repeatedly changes the size of any of the characters and symbols displayed on the display unit until the sight of the occupant is determined according to the determination result of the determination means Control device. A seat position detecting means for detecting a seat slide amount and a seat back angle when an occupant gets in the vehicle interior;
The said calculating means is provided with the distance correction | amendment means which correct | amends the distance from the said display part to the said passenger | crew using the seat slide amount detected by the said seat position detection means, and a seat back angle. The on- vehicle display control device according to 1 or 2 . The said display control means changes either the character and symbol displayed on the said display part to the magnitude | size which can be read with the fixed visual acuity, The any one of Claims 1-3 characterized by the above-mentioned. In-vehicle display control device. The in-vehicle display control device according to any one of claims 1 to 4 , wherein the instructing unit instructs an answer to the display content by voice . 6. The system according to claim 1, further comprising a notification unit that notifies a passenger of a visual acuity corresponding to the display content when the determination unit determines that the answer matches the display content. The vehicle-mounted display control apparatus described in 1. The notification means notifies the visual acuity reduction when the visual acuity corresponding to the display content when the answer matches the display content by the determination means is less than the predetermined visual acuity. The vehicle-mounted display control apparatus of any one of 1-6 .

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