JP2016203820A - Display device, and control method of display panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device which appropriately transmits information to a user and can make the user be aware of the user's fatigue.SOLUTION: A display device 1 comprises: a display panel 15 for displaying predetermined information 21; an information acquisition part 11 which acquires fatigue determination information 22 for determining a fatigue state of a user; a determination part 12 for determining whether the user is fatigued on the basis of the fatigue determination information 22; and a display control part 13 which, when the determination part 12 has determined that the user is fatigued, controls a display mode of display in the display panel 15 in such a manner that a virtual depth representation is suppressed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a display device and a display panel control method, and more particularly, to a display device and a display panel control method for controlling a display mode according to a user's fatigue status.

  In recent years, instrument panels for automobiles and the like are shifting from mechanical meters to displays using liquid crystal panels. A vehicle display device using a liquid crystal panel or the like can perform various displays, and can change a display form or perform a decorative display. Patent Document 1 discloses a vehicle capable of displaying a three-dimensional representation of an instrument displayed on a display panel by irradiating virtual light from a virtual light source to form reflected light or shadow on a frame portion of the instrument. A display device is disclosed. In addition, the virtual stereoscopic display is implemented not only in the vehicle display device but also in various devices such as a game machine.

JP 2011-121544 A

  In such a display device, various displays are possible. For example, in the case of a vehicle, the operation information (speed meter, etc.) used for the operation of the vehicle is displayed as a virtual three-dimensional display. The three-dimensional effect of the meter can be expressed, or an excellent display of aesthetic expression can be achieved (see Patent Document 1).

  However, when the display object displayed on the instrument panel is displayed with a stereoscopic effect, the display form of the operation information is complicated. For this reason, when the driver is tired due to driving for a long time, the time required for the driver to visually recognize the necessary information becomes long, and there is a problem that the information cannot be accurately conveyed to the driver.

  In view of the above problems, an object of the present invention is to provide a display device and a display panel control method capable of accurately transmitting information to a driver and recognizing fatigue.

  A display device according to the present invention includes a display panel that displays predetermined information, an information acquisition unit that acquires fatigue determination information for determining a user's fatigue status, and the user is fatigued based on the fatigue determination information. When the determination unit determines whether or not the user is tired, the display form displayed on the display panel is a display that suppresses virtual depth expression. A display control unit for controlling the display.

  The display panel control method according to the present invention displays predetermined information on the display panel using a virtual depth expression, acquires fatigue determination information for determining a user's fatigue status, and includes the fatigue determination information in the fatigue determination information. Based on whether or not the user is fatigued based on the determination, the display form displayed on the display panel is a display that suppresses virtual depth expression when it is determined that the user is fatigued. To control.

  According to the present invention, it is possible to provide a display device and a display panel control method capable of accurately transmitting information to a user and recognizing fatigue.

1 is a block diagram illustrating an example of a display device according to a first embodiment; FIG. 3 is a diagram illustrating a display example of a display panel included in the display device according to the first embodiment. FIG. 3 is a diagram showing a display example of a display object according to the first exemplary embodiment. 3 is a flowchart for explaining an operation of the display device according to the first exemplary embodiment; 10 is a flowchart for explaining an operation of the display device according to the second exemplary embodiment; FIG. 10 is a diagram for explaining the operation of the display device according to the second exemplary embodiment; FIG. 10 is a diagram for explaining the operation of the display device according to the second exemplary embodiment; FIG. 10 is a diagram for explaining the operation of the display device according to the second exemplary embodiment; FIG. 10 is a diagram for explaining the operation of the display device according to the second exemplary embodiment; FIG. 10 is a diagram for explaining the operation of the display device according to the second exemplary embodiment; FIG. 10 is a block diagram illustrating an example of a visual line movement detection device used in a display device according to a third embodiment. 10 is a flowchart for explaining an operation of the display device according to the third exemplary embodiment; It is a figure which shows the sum total of the amount of visual line movements for every unit time.

<Embodiment 1>
Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, including this embodiment, the display device of the present invention will be described as an example of a vehicle display device mounted on a vehicle. For this reason, the user becomes a driver.
FIG. 1 is a block diagram illustrating an example of a vehicle display device according to the first embodiment. As shown in FIG. 1, the vehicle display device 1 according to the present embodiment includes an information acquisition unit 11, a determination unit 12, a display control unit 13, and a display panel 15. Here, the information acquisition part 11, the judgment part 12, and the display control part 13 comprise the control part 10 which controls the display apparatus 1 for vehicles and the display panel 15, and the control part 10 is CPU (Central Processing Unit). Etc. A vehicle display device 1 according to the present embodiment is a display device that displays at least information necessary for vehicle operation, such as a vehicle speed, an engine speed, and a shift position, and is generally an instrument panel or cluster. It is called a panel.

  The information acquisition unit 11 acquires operation information 21 and fatigue determination information 22. Here, the operation information 21 is information necessary for vehicle operation. For example, the vehicle speed information, engine speed information, shift position information, oil temperature information, fuel remaining amount information, engine cooling water Various parameters such as water temperature information. The operation information 21 may include auxiliary information in addition to information necessary for vehicle operation. The auxiliary information includes, for example, climate information, date / time information, travel distance information (trip meter, odometer), navigation information, and the like. Moreover, the operation information 21 shown above is an example, and the operation information 21 may include information other than the above.

  The fatigue determination information 22 is information for determining a driver's fatigue status, and is, for example, vehicle travel history information or driver's line-of-sight movement information.

  The determination unit 12 determines whether the driver is tired based on the fatigue determination information 22 acquired by the information acquisition unit 11. When the vehicle travel history information is acquired as the fatigue determination information 22, the determination unit 12 obtains the continuous travel time of the vehicle using the travel history information. Then, the determination unit 12 determines that the driver is tired when the obtained continuous running time of the vehicle is a predetermined time or longer (for example, 2 hours or longer). The method for obtaining the continuous running time of the vehicle will be described in detail in Embodiment 2.

  Further, when the driver's line-of-sight movement information is acquired as fatigue determination information, the determination unit 12 determines that the driver is tired when the driver's line-of-sight movement is below a predetermined level. A method for determining the driver's fatigue status using the line-of-sight movement information will be described in detail in Embodiment 3.

  The display control unit 13 controls display on the display panel 15. Specifically, the display control unit 13 displays various parameters as the operation information 21 acquired by the information acquisition unit 11 on the display panel 15 based on a preset display form.

  The display panel 15 displays information including at least operation information 21 used for vehicle operation. As the display panel 15, for example, a liquid crystal panel or an organic EL (Electroluminescence) panel can be used. FIG. 2 is a diagram illustrating a display example of the display panel 15. As shown in FIG. 2, the display panel 15 includes vehicle speed information 30, engine speed information 31, shift position information 32, oil temperature information 33, remaining fuel information 34, cooling water temperature information 35, Display objects such as climate information 36 and date / time information 37 are displayed. In the display example shown in FIG. 2, the speed information 30, the rotation speed information 31, and the shift position information 32 are displayed in a display form with a virtual depth expression so that a virtual stereoscopic effect can be obtained. Show. It should be noted that the driver can arbitrarily determine information for displaying a stereoscopic effect on the display panel 15.

  In FIG. 2, a virtual depth expression for expressing the stereoscopic effect of the display object is illustrated as a depth amount D. Actually, the display control unit 13 displays a virtually three-dimensional display on the display panel 15 by expressing shadows, reflected light, and the like from a virtual light source on a display object displayed in two dimensions. In the present invention, the method for expressing the virtual depth expression is not particularly limited, and any method can be used. The same applies to FIGS. 7A to 7D described later.

  FIG. 3 shows a display example of the speed information 30 and the rotation speed information 31 as an example of the display object displayed on the display panel 15. FIG. 3 shows an example in which a shadow 312 generated by light from the virtual light source C is displayed on the outer peripheral frame 311 constituting the rotation speed information 31 when it is assumed that the outer peripheral frame 311 is a solid with a depth amount D. is there. The addition of the shadow is not limited to the outer peripheral frame 311 constituting the rotation speed information 31, and the shadow may be added to other constituent elements such as parameter display and the numerical value indicating the speed information 30.

  In the display form as shown in FIG. 3, the depth amount of the virtual depth expression can express the expansion and suppression of the depth expression by the width and contrast of the shadow. For example, when the virtual depth expression amount is increased, that is, when the stereoscopic effect is emphasized, the shadow is displayed with a large width. Further, the contrast between the darkest part and the brightest part of the shadow may be displayed large. Further, when the virtual depth amount is suppressed, that is, when the stereoscopic effect is suppressed, the shadow is displayed with a narrow width. Further, the contrast between the darkest part and the brightest part of the shadow may be displayed small. The width of the shadow in the case of such a display form corresponds to the depth amount D shown in FIGS. 2 and 7A to 7D.

  In the vehicular display device 1 according to the present embodiment, when the determination unit 12 determines that the driver is tired, the display control unit 13 suppresses the virtual depth expression by the display form of the display panel 15. The display on the display panel 15 is controlled so as to achieve the above display. Hereinafter, operation | movement of the display apparatus 1 for vehicles concerning this Embodiment is demonstrated in detail.

  FIG. 4 is a flowchart for explaining the operation of the display device 1 according to the present embodiment. The premise of the operation described in FIG. 4 is a state in which the vehicle on which the vehicle display device 1 is mounted is operating, and the display control unit 13 displays at least the operation information 21 on the display panel 15. As shown in FIG. 4, first, the information acquisition unit 11 (see FIG. 1) acquires fatigue determination information 22 for determining a driver's fatigue status (step S1). Next, the determination unit 12 determines whether or not the driver is tired based on the fatigue determination information 22 acquired by the information acquisition unit 11 (step S2). When the determination unit 12 determines that the driver is not tired (step S2: No), the display control unit 13 displays a virtual depth for three-dimensionally expressing the display object displayed on the display panel 15. The display state using the expression is held (step S3).

  On the other hand, when the determination unit 12 determines that the driver is tired (step S2: Yes), the display control unit 13 is a virtual for expressing the display object displayed on the display panel 15 in a three-dimensional manner. It is set as the display which suppressed depth expression (step S4). Here, “display in which virtual depth expression is suppressed” means that display is performed so that the depth amount D (see FIG. 2) for displaying the display object with a stereoscopic effect is small. For example, when the virtual depth expression is performed using the shadow, the display control unit 13 can suppress the virtual depth expression by narrowing the width of the shadow. In addition, the display in which the virtual depth expression is suppressed includes a case where the display is performed in a planar manner without performing the virtual depth expression.

  With the invention according to the present embodiment described above, it is possible to provide a vehicle display device and a display panel control method capable of accurately transmitting information to a driver and recognizing fatigue. Specifically, when it is not determined that the driver is tired, a decorative display is performed by displaying with a virtual depth expression, and when the driver is determined to be tired In addition, a display in which virtual depth expression is suppressed or a display in which virtual depth expression is not performed is used. When the driver is tired, the recognition power of the display panel 15 is reduced. Therefore, by displaying the display with the virtual depth expression suppressed, the information displayed on the display panel 15 can be visually observed in a shorter time. Can be possible. Furthermore, when the driver recognizes that the virtual depth expression is suppressed, it is possible to recognize fatigue and the degree of fatigue.

  Various information is displayed on the display panel 15 as described above, and information that the driver should most appropriately recognize is either speed information 30, rotation speed information 31, shift position information 32, or these information. It is a combination. Therefore, it is desirable to apply the present invention to display at least such information.

<Embodiment 2>
Next, a second embodiment of the present invention will be described. In the second embodiment, a specific example of the operation of the vehicle display device 1 described in the first embodiment is shown. Note that the vehicular display device used in the present embodiment is basically the same as the vehicular display device 1 described in the first embodiment, and thus redundant description will be omitted as appropriate.

  FIG. 5 is a flowchart for explaining the operation of the vehicle display device 1 according to the present embodiment. As shown in FIG. 5, first, the information acquisition unit 11 acquires vehicle travel history information as fatigue determination information 22 for determining a driver's fatigue status (step S11). Next, the determination unit 12 calculates the continuous travel time of the vehicle using the travel history information acquired by the information acquisition unit 11. And the judgment part 12 judges whether the calculated | required continuous running time of the vehicle is more than 1st time (step S12).

  For example, the information acquisition unit 11 acquires travel history information from a CAN (Controller Area Network) configuring a vehicle network, a navigation device mounted on the vehicle, or the like. When the travel history information is acquired from the vehicle control computer via the CAN, the determination unit 12 obtains the continuous travel time of the vehicle from the engine on / off status, gear selection information, speed information, and the like. Further, when the travel history information is acquired from the navigation device, the continuous travel time is obtained using the travel history of the vehicle. Here, the continuous travel time is a time during which the vehicle travels continuously, and is an accumulated time of the time during which the vehicle travels. For example, the time when the vehicle is temporarily stopped by a signal or the like may be excluded from the accumulated time. Further, when the vehicle is stopped for a predetermined time or longer (for example, about 5 minutes) or when the engine is stopped, the accumulated continuous running time may be reset.

  When the determination unit 12 determines that the continuous running time of the vehicle is not equal to or longer than the first time, that is, when it is determined that the driver is not tired (step S12: No), the display control unit 13 displays the display panel 15 Let D1 be the depth amount of the virtual depth expression for the display object displayed in (Step S13). That is, as illustrated in FIG. 7A, when the display control unit 13 sets each piece of information 30 to 32 to a stereoscopic display, the initial depth amount D1 (the largest depth amount) of each piece of information 30 to 32 is displayed. ). Here, the first time can be arbitrarily determined. As an example, the first time may be 1 hour.

  On the other hand, when the determination unit 12 determines that the continuous running time of the vehicle is equal to or longer than the first time, that is, when the driver determines that the vehicle is tired (step S12: Yes), the display control unit 13 displays The display object displayed on the panel 15 is displayed so that the virtual depth expression is suppressed.

  For example, the determination unit 12 determines whether or not the continuous running time of the vehicle is equal to or longer than the second time (step S14). Here, the second time is longer than the first time, and can be arbitrarily set. As an example, the second time is one and a half hours. When the determination unit 12 determines that the continuous running time of the vehicle is not equal to or longer than the second time (step S14: No), the display control unit 13 performs a virtual operation on the display object displayed on the display panel 15. A depth amount of a typical depth expression is set to D2 (step S15). Here, the depth amount D2 is smaller than the depth amount D1 (D2 <D1). Therefore, as illustrated in FIG. 7B, the display control unit 13 suppresses the stereoscopic effect more than the case illustrated in FIG. 7A (depth amount D1) when each of the information 30 to 32 is displayed with a stereoscopic effect. be able to.

  On the other hand, when the determination unit 12 determines that the continuous travel time of the vehicle is equal to or longer than the second time (step S14: Yes), the determination unit 12 determines whether the continuous travel time of the vehicle is equal to or longer than the third time. Is determined (step S16). Here, the third time is longer than the second time, and can be arbitrarily set. As an example, the third time is 2 hours. If the determination unit 12 determines that the continuous running time of the vehicle is not equal to or longer than the third time (step S16: No), the display control unit 13 performs a virtual operation on the display object displayed on the display panel 15. A depth amount of a typical depth expression is set to D3 (step S17). Here, the depth amount D3 is smaller than the depth amount D2 (D3 <D2). Accordingly, as illustrated in FIG. 7C, the display control unit 13 suppresses the stereoscopic effect more than the case illustrated in FIG. 7B (depth amount D2) when each of the information 30 to 32 is displayed with a stereoscopic effect. be able to.

  Further, when the determination unit 12 determines that the continuous running time of the vehicle is equal to or longer than the third time (step S16: Yes), the display control unit 13 virtually displays the display object displayed on the display panel 15. The depth amount of the deep depth expression is set to D4 (step S18). Here, the depth amount D4 is smaller than the depth amount D3 (D4 <D3). Therefore, as illustrated in FIG. 7D, the display control unit 13 can suppress the stereoscopic effect more than the case illustrated in FIG. 7C (depth amount D3) when displaying each piece of information 30 to 32. Note that the display example illustrated in FIG. 7D illustrates a case where the depth amount D4 is 0, that is, a case where the display object is displayed planarly without performing virtual depth expression.

  In the display examples shown in FIGS. 7A to 7D, the virtual depth amount of the display object displayed on the display panel 15 changes in four stages D1 to D4 according to the continuous travel time of the vehicle. explained. However, in the present embodiment, the depth amount may be changed in five steps or more, or may be changed in two steps or three steps. Moreover, you may control so that the depth amount D reduces gradually, so that the continuous running time of a vehicle becomes long.

  In the example shown in FIG. 6, for example, the virtual depth amount is set to 100% when the continuous travel time corresponding to the continuous use time is 1 hour from the start of travel. 100% in this case is, for example, the depth amount D1 shown in FIG. 7A. Further, when the continuous travel time is 1 hour or more and 2 hours, the virtual depth expression amount is gradually suppressed according to the continuous travel time. In the example of FIG. 6, the virtual depth expression is 0% when the continuous running time is 2 hours or more, but the virtual depth expression is not limited to 0%, such as 5% or 10%, and the driver Any depth expression amount that can be accurately recognized in a short time may be used. The transition from the virtual depth expression amount of 100% to 0% is not limited to a straight line that is directly proportional to the continuous running time, but may be a curve or an exponential function. Furthermore, the continuous running time when the suppression of the virtual depth expression amount is started is not limited to 1 hour, and may be a shorter elapsed time or a longer elapsed time.

  In the invention according to the present embodiment described above, as in the vehicle display device 1 described in the first embodiment, the vehicle display device capable of accurately transmitting information to the driver, and the display panel A control method can be provided.

<Embodiment 3>
Next, a third embodiment of the present invention will be described. In the present embodiment, a configuration for determining the driver's fatigue status using the driver's line-of-sight movement information will be described in detail. Note that the vehicular display device used in the present embodiment is basically the same as the vehicular display device 1 described in the first embodiment, and thus redundant description will be omitted as appropriate.

  FIG. 8 is a block diagram showing an example of the line-of-sight movement detection device 40 used in the vehicle display device according to the present embodiment. As shown in FIG. 8, the line-of-sight movement detection device 40 includes an infrared irradiation unit 41, an infrared camera 42, and a line-of-sight detection unit 43. The infrared irradiation unit 41 irradiates the driver's face portion 45 with infrared rays. The infrared camera 42 captures an image of the driver's face 45. That is, the infrared camera 42 captures an image of the driver's face portion 45 irradiated with infrared rays. The line-of-sight detection unit 43 detects the driver's line-of-sight movement using an image of the driver's face 45 taken by the infrared camera 42. Specifically, the gaze detection unit 43 detects the gaze movement of the driver using the corneal reflection position and the pupil position. Information (line-of-sight movement information) related to the driver's line-of-sight movement detected by the line-of-sight detection unit 43 is supplied to the information acquisition unit 11 shown in FIG.

  FIG. 9 is a flowchart for explaining the operation of the vehicle display device according to the present embodiment. As shown in FIG. 9, first, the information acquisition unit 11 (see FIG. 1) acquires line-of-sight movement information from the line-of-sight movement detection device 40 described above as fatigue determination information 22 for determining a driver's fatigue status. (Step S21). Next, the determination unit 12 determines whether the driver is tired based on the line-of-sight movement information acquired by the information acquisition unit 11. Specifically, it is determined whether or not the driver's line-of-sight movement is below a predetermined level (step S22).

  FIG. 10 is a diagram illustrating the total amount of line-of-sight movement per unit time. As shown in FIG. 10, the determination unit 12 determines that the driver's line-of-sight movement is equal to or higher than a predetermined level and the driver is not fatigued when the total amount of line-of-sight movement per unit time is equal to or greater than a predetermined threshold. To do. On the other hand, if the total amount of line-of-sight movement per unit time is below a predetermined threshold, it is determined that the driver's line-of-sight movement is below a predetermined level and the driver is tired. In the example shown in FIG. 10, it is determined that the driver is in a fatigue state when the total amount of line-of-sight movement per unit time (for example, every 10 seconds) falls below a predetermined threshold value twice (see timing t1). doing. Then, after that, when the total of the line-of-sight movement amount per unit time is continuously equal to or more than a predetermined threshold value twice (see timing t2), it is determined that the driver is not fatigued.

  Note that the example shown in FIG. 10 is an example, and in the present embodiment, a criterion for determining whether or not the driver is fatigued can be arbitrarily set. That is, the value of the threshold value, the number of times that the threshold value is continuously decreased (corresponding to t1), and the number of times that the threshold value is continuously exceeded (corresponding to t2) can be arbitrarily set.

  In the above description, the case where the sum of the line-of-sight movement amount per unit time is used when determining whether or not the driver's line-of-sight movement is below a predetermined level has been described. However, in this embodiment, the number of line-of-sight movements per unit time may be used when determining whether or not the line-of-sight movement of the driver is below a predetermined level. In this case, when the number of line-of-sight movements per unit time of the driver falls below a predetermined number, it can be determined that the driver is tired.

  The number of line-of-sight movements is the number of times of line-of-sight movement that is greater than or equal to a predetermined amount (a value greater than the error). For example, when the total number of line-of-sight movements per unit time (for example, every 10 seconds) falls below a predetermined number twice consecutively, it can be determined that the driver is in a fatigued state. After that, when the total number of line-of-sight movements per unit time reaches a predetermined number of times continuously twice, it can be determined that the driver is not fatigued.

  As shown in FIG. 9, when the driver's line-of-sight movement is not below a predetermined level (step S22: No), the determination unit 12 determines that the driver is not fatigued. In this case, the display control unit 13 holds a display state using a virtual depth expression for stereoscopically expressing the display object displayed on the display panel 15 (step S23).

  On the other hand, when the driver's line-of-sight movement is below a predetermined level (step S22: Yes), the determination unit 12 determines that the driver is tired. In this case, the display control unit 13 sets the display to suppress the virtual depth expression for three-dimensionally expressing the display object displayed on the display panel 15 (step S24). Note that the display in which the virtual depth expression is suppressed includes a case where the display is performed in a planar manner without performing the virtual depth expression. Since the method for suppressing the virtual depth expression is the same as that described in the first and second embodiments, the duplicate description is omitted.

  In the above description, the case where the driver's fatigue status is determined using the level of the driver's eye movement has been described. However, in the present embodiment, for example, the number of blinks of the driver may be detected, and it may be determined that the driver is fatigued when the number of blinks exceeds a predetermined number.

  Further, when the determination unit 12 determines that the driver is tired, a warning may be displayed on the display panel 15 in addition to suppressing the virtual depth expression for the display object. Thus, by displaying the warning on the display panel 15, it is possible to inform the driver that the vehicle is in a fatigued state. For example, the frame portion of the meter may be a conspicuous color such as red, or a warning message may be blinked.

  Also in the invention according to the present embodiment described above, as in the vehicle display device 1 described in the first embodiment, a vehicle display device capable of accurately transmitting information to the driver and recognizing fatigue. And a method for controlling the display panel can be provided.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited only to the configuration of the above embodiment, and within the scope of the invention of the claims of the present application. It goes without saying that various modifications, corrections, and combinations that can be made by those skilled in the art are included.

  For example, as a condition for determining whether or not the driver is tired, there is a case where it cannot be grasped simply by only the continuous driving time or the frequency of eye movement. The determination by the determination unit 12 can be, for example, a combination of the above-described determination criteria, a combination of various parameters such as driving time or distance on a highway, traffic jam time, and brake operation frequency.

  Further, in the above-described embodiment, the description has been given as an example of the vehicle display device using the driver as a user. However, the present invention is not limited to the vehicle display device, and is based on devices such as game machines, various computers, and simulation devices. The processing of the display mode is possible, and the present invention can be applied to various devices that perform virtual depth expression such as a decoration purpose for a display object.

DESCRIPTION OF SYMBOLS 1 Display apparatus 10 for vehicles Control part 11 Information acquisition part 12 Determination part 13 Display control part 15 Display panel 21 Operation information 22 Fatigue judgment information

Claims (8)

A display panel for displaying predetermined information;
An information acquisition unit for acquiring fatigue determination information for determining a user's fatigue status;
A determination unit for determining whether the user is fatigued based on the fatigue determination information;
A display control unit configured to control the display form displayed on the display panel so as to display a virtual depth expression when the determination unit determines that the user is tired; ,
Display device. The information acquisition unit acquires use history information of a device on which the display device is mounted as the fatigue determination information,
The determination unit determines that the user is tired when the continuous use time of the device on which the display device obtained using the use history information is mounted is a predetermined time or more,
The display device according to claim 1. When the determination unit determines that the user is tired, the display control unit is a virtual display type displayed on the display panel as the continuous use time of the device on which the display device is mounted becomes longer. Control the display form displayed on the display panel so as to gradually suppress the depth expression.
The display device according to claim 2. The information acquisition unit acquires the user's line-of-sight movement information as the fatigue determination information,
The determination unit determines that the user is tired when the user's line-of-sight movement is below a predetermined level.
The display device according to claim 1. The display control unit expresses a virtual depth by using a shadow on a display object to be displayed, and reduces the effect of the shadow to suppress the virtual depth expression on the display panel. Control the display form to display,
The display device according to any one of claims 1 to 4. The display control unit controls a display form to be displayed on the display panel so as to include a display that does not perform virtual depth expression as a display that suppresses virtual depth expression.
The display device according to any one of claims 1 to 5. The display device is a vehicle display device,
The information acquisition unit acquires travel history information of a vehicle on which the display device is mounted as the fatigue determination information,
The determination unit determines that the user is tired when the continuous travel time of the vehicle obtained using the travel history information is equal to or longer than a predetermined time.
The display device according to claim 2. The predetermined information is displayed on the display panel using a virtual depth expression,
Fatigue judgment information for judging the user's fatigue status is acquired,
Determining whether the user is fatigued based on the fatigue determination information;
When it is determined that the user is tired, the display form displayed on the display panel is controlled to be a display that suppresses virtual depth expression.
Display panel control method.