JP4229923B2 - Display device, instrument panel, motor vehicle, and control method of instrument panel - Google Patents

Description

  The present invention relates to a display device, and more particularly to a display device for an instrument panel mounted on a motor vehicle. The present invention also relates to an instrument panel, a control method therefor, and a motor vehicle.

  An instrument panel called an instrument panel (abbreviated as “instrument panel”) is provided in the motor vehicle, and the instrument panel displays information necessary for driving the motor vehicle such as speed. Since the driver performs driving while considering information displayed on the instrument panel and changing from moment to moment, it is preferable that the instrument panel can perform display with high visibility.

As a technique for realizing display with high visibility, Patent Document 1 discloses a technique for performing stereoscopic display using a pair of parabolic mirrors.
JP 2000-47619 A

  However, as shown in FIG. 10, since the field of view when the driver confirms the outside of the vehicle and the field of view when confirming the display of the instrument panel are different, the driver alternates between the exterior and the instrument panel. Therefore, there is a problem that attention to the outside is distracted when the user looks at the instrument panel. This problem still exists even if the visibility is improved by using the technique disclosed in Patent Document 1.

  For this reason, the driver usually does not often see the instrument panel display while driving the vehicle. The instrument panel is often provided with an indicator for displaying a warning regarding the remaining amount of fuel, oil leaks, etc. However, as described above, since the driver does not often see the instrument panel, information that should be warned. Is difficult to promptly transmit to the driver, and in particular, it is often impossible to effectively warn about a physical quantity that changes in a short time such as a vehicle speed. Such a problem cannot be essentially solved even by using the technique of Patent Document 1.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a display device suitably used for an instrument panel mounted on a motor vehicle, an instrument panel provided with such a display device, and control thereof. It is an object to provide a method and a motor vehicle with such an instrument panel.

  A display device according to the present invention is a display device for an instrument panel mounted on a motor vehicle, can display information related to the state of the motor vehicle, and further includes a predetermined physical quantity representing the state of the motor vehicle. When the physical quantity falls within a predetermined range, a warning can be issued by performing at least one of a change in display luminance and a change in display color, thereby achieving the above object.

  In a preferred embodiment, the predetermined physical quantity is a vehicle speed, a rotational speed of a motor, a remaining fuel amount, a remaining battery amount, a water temperature, or an inter-vehicle distance.

  In a preferred embodiment, the change in the display luminance is a display when the predetermined physical quantity is outside the predetermined range when the predetermined physical quantity is within the predetermined range. It is performed so as to be at least temporarily higher than the luminance.

  In a preferred embodiment, the display luminance is changed intermittently when the predetermined physical quantity falls within a predetermined range.

  In a preferred embodiment, the frequency of the intermittent display brightness change is increased or decreased according to the seriousness of the situation to be warned.

  In a preferred embodiment, the change in the display luminance is performed so that black is intermittently displayed when the predetermined physical quantity falls within a predetermined range.

  In a preferred embodiment, the frequency of the intermittent black display is increased or decreased according to the seriousness of the situation to be warned.

  In a preferred embodiment, the display color change is performed such that the severity of the situation to be warned is indicated by the individual display color.

  In a preferred embodiment, the change in display luminance and the change in display color are performed in combination, and the change in display luminance is intermittently such that an increase or decrease in frequency indicates the severity of the situation to be warned. Done.

  In a preferred embodiment, the change in the display luminance and / or the change in the display color is performed in a part of the display area.

  In a preferred embodiment, the change in the display luminance and / or the change in the display color is performed in the entire display area.

  In a preferred embodiment, the change in the display luminance and / or the change in the display color is performed in a display area of the predetermined physical quantity.

  In a preferred embodiment, the change in the display luminance and / or the change in the display color is also performed in an area where the predetermined physical quantity is not displayed in the display area.

  In a preferred embodiment, the predetermined physical quantity is a physical quantity that is not displayed in the display area.

  In a preferred embodiment, the display device according to the present invention is a liquid crystal display device including a liquid crystal panel having a pair of substrates and a liquid crystal layer provided between the pair of substrates.

  In a preferred embodiment, the display device according to the present invention further includes an illumination device disposed on a back side of the liquid crystal panel, and the display luminance can be changed by changing the luminance of the illumination device.

  In a preferred embodiment, the display device according to the present invention further includes a drive circuit that supplies a signal for driving the liquid crystal panel, and the display luminance is changed by changing a signal supplied from the drive circuit. Changes or changes in the display color may be made.

  In a preferred embodiment, the display device according to the present invention further includes a driving circuit that supplies a signal for driving the liquid crystal panel, and the driving circuit applies to each pixel of the liquid crystal panel within one vertical scanning period. The black display signal corresponding to the black display can be supplied at a timing different from the timing of supplying the data signal, and each pixel of the liquid crystal panel has a predetermined first of the time corresponding to one vertical scanning period. The time data signal is held, and a predetermined second time black display signal is held.

  In a preferred embodiment, the display device according to the present invention changes the ratio of the display luminance by changing the ratio between the first time during which a data signal is held and the second time during which a black display signal is held. Changes can be made.

  The instrument panel according to the present invention includes the display device having the above-described configuration, thereby achieving the above-described object.

  The motor vehicle according to the present invention includes an instrument panel having the above-described configuration, thereby achieving the above object.

  An instrument panel control method according to the present invention includes a display device capable of displaying information related to the state of an automobile, and is a method for controlling an instrument panel mounted on an automobile, which represents the state of the automobile. A determination step of determining whether or not a predetermined physical quantity of the physical quantities is within a predetermined range; and when it is determined in the determination step that the predetermined physical quantity is within a predetermined range, A warning step in which the display device issues a warning by performing at least one of a change in display luminance and a change in display color, whereby the above object is achieved.

  The display device according to the present invention performs at least one of a change in display luminance and a change in display color when a predetermined physical quantity among physical quantities representing the state of the motor vehicle falls within a predetermined range. May issue a warning. For this reason, the driver can recognize that the motor vehicle is in a state of caution even when the line of sight is left outside, and as a result, more safe driving is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited to the following embodiment.

  The display device 100 according to the present embodiment will be described with reference to FIGS. FIGS. 1A and 1B are a plan view and a cross-sectional view schematically showing the display device 100, respectively.

  The display device 100 is a display device for an instrument panel mounted on a motor vehicle, and can display information on the state of the motor vehicle. Although FIG. 1A illustrates a case where the vehicle speed and the engine speed are displayed, of course, the displayed information is not limited to these. The fuel remaining amount, water temperature, battery remaining amount, shift lever position, and the like may be displayed. Further, in FIG. 1A, a display simulating an analog meter using scales and hands is performed, but a display simulating a digital meter whose number changes from moment to moment may be performed.

  As shown in FIG. 1B, the display device 100 according to the present embodiment includes a liquid crystal panel 10 having a pair of substrates (for example, glass substrates) 11 and 12 and a liquid crystal layer 13 provided therebetween, and a liquid crystal The liquid crystal display device includes an illumination device (backlight) 20 provided on the back side of the panel 10. Although not shown in the figure, at least a pair of electrodes for applying a voltage to the liquid crystal layer 13 is provided on the liquid crystal layer 13 side of the substrates 11 and / or 12, and the liquid crystals of the substrates 11 and 12 are provided. A pair of polarizing plates is typically provided on the side opposite to the layer 13.

  The display device 100 according to the present invention can issue a visual warning when a predetermined physical quantity of physical quantities representing the state of the motor vehicle falls within a predetermined range.

  Specifically, the physical quantity representing the state of the automatic vehicle includes the vehicle speed, the rotational speed of the engine (gasoline engine or electric motor), the remaining fuel amount, the remaining battery amount, the water temperature, the inter-vehicle distance, and the like. Can issue a warning when a predetermined one of them falls within a predetermined range (hereinafter also referred to as “warning range”). For example, when the vehicle speed exceeds a certain speed, the display device 100 displays the water temperature when the number of engine rotations exceeds a certain number of rotations, the remaining fuel level or the remaining battery level falls below a certain amount, A warning is issued when the temperature rises above a certain temperature, or when the distance between vehicles drops below a certain distance. When issuing a warning about the inter-vehicle distance, a warning range may be set for the inter-vehicle distance between the driving vehicle and the preceding vehicle according to the vehicle speed. For example, a warning is set to be issued when the inter-vehicle distance is equal to or less than the stop distance (idle distance + braking distance) when the idle time is 2 seconds. The inter-vehicle distance can be detected using an infrared radar or the like.

  Specifically, the warning is issued by performing at least one of a change in display luminance and a change in display color. FIG. 2 schematically shows how the display device 100 issues a warning due to a change in display luminance. FIG. 2 illustrates the case where the display brightness is increased when the predetermined physical quantity is within the warning range, compared to when the physical quantity is outside the warning range. You may go.

  Since the display device 100 according to the present invention issues a warning by performing at least one of a change in display brightness and a change in display color, as shown schematically in FIG. 3, the driver keeps his line of sight outward. Even if it exists, it can recognize that the motor vehicle is a state which should be careful. Therefore, safer driving becomes possible.

  In order to enhance the effect of the warning, a voice warning (warning sound) may be used in combination. However, it may be difficult to recognize the warning only by voice depending on the surrounding volume (for example, when car audio is used at a high volume). On the other hand, since the display device 100 according to the present invention issues at least a visual warning, the driver can be surely recognized the warning.

  FIG. 2 shows a case where the brightness of the entire display area of the display device 100 is increased. However, as shown in FIG. 4, only a part of the display area (for example, only a speed display part in the case of a warning related to speed). ) May be increased.

  Further, the display brightness may be increased while the predetermined physical quantity is within the warning range, the display with high brightness and the display with normal brightness may be switched periodically, and the high brightness You may change the period which switches a display and the display of normal brightness | luminance according to the degree of warning (for example, according to the magnitude | size of the overspeed). For example, it may indicate that the situation is more serious by switching between high-luminance display and normal-luminance display faster. The change in display brightness itself may be performed intermittently or continuously. Further, instead of increasing the display brightness, blinking display may be performed, and the blinking cycle may be changed according to the seriousness of the situation. That is, black display may be performed intermittently when a predetermined physical quantity falls within the warning range, and the blinking display cycle may be changed according to the degree of warning. Further, high luminance display and black display may be alternately performed. If the frequency of intermittent display luminance change or the frequency of intermittent black display is increased or decreased according to the seriousness of the situation to be warned, the warning can be performed more effectively.

  The luminance change can be performed, for example, by changing the luminance of the backlight 20. Specifically, the display brightness can be increased by increasing the brightness of the backlight 20, and intermittent black can be achieved by intermittently setting the brightness of the backlight 20 to zero (that is, turning off the backlight 20). Display can be made.

  In addition, the luminance can be changed by changing a signal (drive signal) supplied from a drive circuit (not shown here) for driving the liquid crystal panel 10. For example, display luminance can be increased by supplying a higher gradation signal, and intermittent black display can be performed by intermittently supplying the lowest gradation signal.

  When a warning is issued due to a change in display color, it is preferable to use a color with a high warning effect. Specifically, it is preferable to use red (R) or yellow (mixed color of R and G). The display color can be changed, for example, by changing a drive signal supplied from the drive circuit. Also, various colors can be used to relatively represent the severity of the situation to be warned. For example, a certain situation to be warned may be indicated in yellow, a more serious situation in orange, and a more serious situation in red. In this way, when the display color is changed so that the severity of the situation to be warned is indicated by the individual display colors, the warning can be performed more effectively. Further, such color coding with a serious degree may be combined with the increase / decrease in the intermittent display luminance change frequency (or the intermittent black display frequency) as described above. For example, when the most serious situation is indicated, red may be used and the blinking cycle may be made the shortest.

  If a warning is given by a change in display brightness, an effective warning can be given by the spatiotemporal characteristics of human vision. In addition, when a warning is given by a change in display color, an effective warning can be given by a color effect. Of course, if both the change in display luminance and the change in display color are performed, the warning effect can be enhanced. At this time, the change in display luminance and the change in display color may be performed for the entire display area, or may be performed for a specific area (for example, an area in which a physical quantity within the warning range is displayed). Good. For example, when issuing a warning about the water temperature, the luminance of the entire display area may be changed and the display color of the area displaying the water temperature may be changed.

  Which physical quantity of the physical quantities representing the state of the automatic vehicle is to be issued a warning and what value is set for the warning range may be appropriately determined according to the use of the vehicle. From the viewpoint of convenience, it is preferable that these can be arbitrarily set from the outside of the display device 100 (for example, by the driver).

  The display device 100 according to the present invention is superior to the case where a warning is issued by simply displaying an indicator in the display area as follows. The example of the display which imitated the indicator is shown to Fig.5 (a)-(c). FIG. 5A shows an indicator for giving some warning, FIG. 5B shows an indicator showing the remaining amount of fuel, and FIG. 5C shows an indicator showing engine oil leakage. . When warning is performed using the indicator display as shown in FIGS. 5A to 5C, it is naturally necessary to display the indicator itself in a part of the display area. On the other hand, the display device 100 according to the present invention issues a warning based on a change in display luminance and / or a change in display color, so there is no need to display an indicator for warning. That is, in the display device 100, a warning function can be provided to a display area that is not originally related to the warning display (for example, a speed display area or a background area that displays no information). For this reason, it is not necessary to secure an area only for warning display in the display area, and various information can be displayed in various layouts in the display area. In the display device 100, an indicator may be displayed in the display area for design reasons.

  The display device 100 according to the present invention is also excellent in that a warning can be given in various modes as necessary. For example, a change in display luminance and / or a change in display color may be performed in a display area that displays a physical quantity that falls within the warning range, or other areas (within the warning range). It may be performed in a region where no physical quantity is displayed) or may be performed in both. That is, a change in display luminance and / or a change in display color may be performed in a part of the display area or in the entire display area. As described above, the display device 100 can change the display luminance and / or the display color in an area other than the area displaying the physical quantity within the warning range as necessary. Thereby, the warning effect can be enhanced. The display device 100 can also give a warning regarding a physical quantity that is not displayed in the display area.

  Next, an example of a procedure for controlling the instrument panel including the display device 100 will be described with reference to FIGS. 6 and 7. FIG. 6 is a flowchart illustrating an example of a control procedure of the instrument panel, and FIG. 7 is a diagram illustrating an example of a specific configuration for performing such control.

  First, which physical quantity is to be warned and in what range the warning is to be issued are set in advance from the outside via the input device 30 (warning items and warning range setting step). For example, the driver sets a warning range of 60 km / h or more for the vehicle speed.

  Next, data relating to the state of the motor vehicle is captured (data capturing step). Specifically, data relating to the state of each device is collected by the CPU 40 from various devices such as wipers, brakes, mirrors, steering wheels, engines, and transmissions provided in the motor vehicle. At this time, the collected data is sent to the display device 100 via the CPU 40, and display is thereby performed.

  Subsequently, for the physical quantity set as a warning item in advance, the captured data is compared with the warning range, and the CPU 40 determines whether or not the physical quantity is within the predetermined warning range (determination step). For example, when the warning range is set to 60 km / h or more for the vehicle speed, it is determined whether or not the current vehicle speed is 60 km / h or more.

  When the CPU 40 determines that the warning item is within the warning range (when the current vehicle speed is 60 km / h or more in the above example), the CPU 40 generates a warning display signal and displays the display device 100. Issues a warning based on the warning display signal (warning step). On the other hand, if it is determined that the warning item is out of the warning range (in the above example, the current vehicle speed is less than 60 km / h), the newly acquired data is compared again with the warning range. A determination is made.

  Next, how to issue a warning based on the warning display signal will be described with reference to FIG. Below, the case where the illuminating device 20 is provided with the fluorescent tube is demonstrated.

  First, input control to the inverter is performed based on the warning display signal. Specifically, adjustment of the level (magnitude) of the voltage applied to the inverter and on / off control of the inverter are performed. Since the level (magnitude) of the output voltage from the inverter can be determined by such input control, the emission luminance of the fluorescent tube can be controlled as a result.

  As illustrated in FIG. 8, when the fluorescent tube is provided so that the brightness can be controlled independently corresponding to the right side and the left side of the display area, the brightness of the entire display area can be changed. Also, it is possible to change the luminance only on the right side (or the left side) of the display area. If the brightness of the portion of the display area that displays a warning item is changed, the driver's attention can be directed to that portion. For example, when displaying the speed and fuel level on the left side of the display area and displaying the engine speed and water temperature on the right side, when issuing a warning about speed and fuel level, When the warning about the water temperature is issued, the brightness on the right side of the display area is changed, so that the driver can easily recognize what the issued warning is.

  In addition, although the case where the illuminating device 20 includes a fluorescent tube has been described here, it is needless to say that other types of illuminating devices may be used. In an illuminating device including an LED (light emitting diode), a circuit (LED driving circuit) for driving the LED is used instead of the inverter. Therefore, instead of input control to the inverter, input control to the LED driving circuit is performed. Done. As an illuminating device provided with LEDs, there are known an edge light type using a combination of an LED and a light guide plate, and a direct type provided with a plurality of LEDs arranged in a matrix (referred to as an LED array). When the direct type is used, it is easy to subdivide the area where the brightness can be controlled independently, and thus it is easy to partially change the brightness of the display area.

  In the present embodiment, the present invention has been described by way of an example in which a liquid crystal display device is used as the display device 100. However, a display device other than a liquid crystal display device may be used, and an organic EL display device, an inorganic EL display device, Alternatively, a self-luminous display device such as an SED (Surface-conduction Electron-emitter Display) attracting attention recently may be used.

  In the case of using a liquid crystal display device, so-called “black insertion driving” may be performed in order to suppress afterimages and blurring of moving images. “Black insertion driving” is basically a driving method for performing impulse-type display similar to CRT in a liquid crystal display device that performs hold-type display, and is also referred to as “pseudo-impulse driving”. When black insertion driving is performed, it is possible to suppress afterimages and blurring of moving images.

  Hereinafter, the black insertion drive will be described in more detail with reference to FIGS.

  In a general liquid crystal display device, as shown in FIG. 9A, the hold type in which the luminance corresponding to the data signal written in a certain vertical scanning period lasts until a new data signal is written in the next vertical scanning period. Is displayed. On the other hand, in the CRT, as shown in FIG. 9B, an impulse-type display in which light emission is performed for a part of one vertical scanning period is performed. One vertical scanning period corresponds to one frame in the case of non-interlaced driving, and corresponds to one field in the case of interlaced driving in which one frame is divided into a plurality of fields.

  When black insertion driving is performed, a black display signal corresponding to black display is supplied to each pixel from the driving circuit at a timing different from the timing of supplying the data signal within one vertical scanning period. Each pixel is in a state where a data signal is held for a predetermined time in a time corresponding to one vertical scanning period, and in a state where a black display signal is held for a predetermined time in the remaining time. In this way, as shown in FIG. 9C, a pseudo impulse type display can be performed, and the afterimage and the blurring of the moving image can be suppressed.

  The ratio between the time for which the data signal is held and the time for which the black display signal is held may be appropriately set according to the type of information to be displayed. From the viewpoint of sufficiently suppressing afterimages and blurring of moving images, it is preferable that the time during which the black display signal is held is ¼ or more of the time corresponding to one vertical scanning period.

  Note that FIG. 9C shows the case where the luminance decreases to the black display state within the time during which the black display signal is held, but the luminance is not necessarily within the black display state within the time during which the black display signal is held. There is no need to lower it. The time for writing the black display signal (time when the TFT is active when writing the black display signal) is short, the response speed of the liquid crystal layer is slow, or the time for holding the black display signal is short Then, the luminance is not sufficiently lowered and a strict black display state may not be obtained, but even in that case, the effect of the pseudo impulse drive can be obtained.

  As a specific method of black insertion driving, a known method can be widely used. When the methods disclosed in Japanese Patent Laid-Open Nos. 2001-60078 and 2001-296838 are used, black insertion driving can be performed with a simple configuration.

  Further, as disclosed in Japanese Patent Application Laid-Open No. 2001-60078, a configuration capable of generating a black display signal for performing black insertion driving, which can generate a signal different from the black display signal in the data signal, that is, the lowest gradation signal. If adopted, a voltage higher (or lower) than the voltage corresponding to the lowest gradation signal can be applied to the liquid crystal layer, so that the response speed of the liquid crystal layer when writing a black display signal is improved. Thus, the luminance can be quickly brought into the black display state within the time when the black display signal is held. Therefore, it is easy to sufficiently obtain the effect of suppressing the afterimage feeling and the blurring of the moving image.

  As described above, the black insertion drive can improve the quality of moving image display, but the display luminance can be changed by performing the black insertion drive. When black insertion driving is performed, the black display signal is held for a certain period of one vertical scanning period, so that the display luminance is lower than that when normal driving is performed. Therefore, the display luminance can be changed by switching between normal driving and black insertion driving. Also, the longer the time for which the black display signal is held within one vertical scanning period, the lower the display brightness, and the shorter the display brightness becomes, the higher the display brightness. Therefore, the data signal is held while continuously performing black insertion driving. The display luminance can be changed by changing the ratio between the time and the time during which the black display signal is held.

  As described above, the display device 100 according to the present invention can be suitably used as an instrument panel of a motor vehicle. Note that “automobile” refers to an automatically propelled vehicle or machine that is used for transportation of passengers and goods or movement of goods, such as passenger cars, motorcycles, buses, trucks, tractors, airplanes, It refers to motor boats, civil engineering vehicles, trains, etc. Of course, not only those having an internal combustion engine such as a gasoline engine but also those having an electric motor are included.

  ADVANTAGE OF THE INVENTION According to this invention, the display apparatus used suitably for the instrument panel mounted in a motor vehicle is provided. The present invention can be used for non-luminous display devices such as liquid crystal display devices, organic EL display devices, inorganic EL display devices, and self-luminous display devices such as SEDs.

It is a figure which shows the display apparatus 100 by this invention typically, (a) is a top view, (b) is sectional drawing. It is a figure which shows typically a mode that the display apparatus 100 by this invention issues a warning. It is a figure for demonstrating the effect of this invention. It is a figure which shows typically a mode that the display apparatus 100 by this invention issues a warning. (A)-(c) is a figure which shows the example of the display which imitated the indicator. 4 is a flowchart showing an example of a control procedure of an instrument panel including the display device 100. FIG. 7 is a block diagram illustrating an example of a specific configuration for performing the control illustrated in FIG. 6. It is a block diagram for demonstrating how a warning is issued based on the warning display signal. (A) is a graph which shows the time change of the brightness | luminance in the liquid crystal display device which performs a hold-type display, (b) is a graph which shows the time change of the brightness | luminance in CRT which performs an impulse-type display, (c ) Is a graph showing a change in luminance with time in a liquid crystal display device that performs black insertion driving (pseudo impulse driving). It is a figure for demonstrating the problem in the conventional instrument panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Liquid crystal panel 11, 12 Board | substrate 13 Liquid crystal layer 20 Illuminating device (backlight)
30 input device 40 CPU
100 Display device

Claims (19)

A display device for an instrument panel mounted on a motor vehicle,
Information on the state of the motor vehicle can be displayed, and further, when a predetermined physical quantity of the physical quantities representing the state of the motor vehicle falls within a predetermined range, a change in display luminance and a change in display color can be issued a warning by performing at least one of,
The display device is a liquid crystal display device including a liquid crystal panel having a pair of substrates and a liquid crystal layer provided between the pair of substrates, and a drive circuit for supplying a signal for driving the liquid crystal panel. ,
The driving circuit can supply a black display signal corresponding to black display at a timing different from a timing of supplying a data signal to each pixel of the liquid crystal panel within one vertical scanning period. Each pixel is a display device in which a predetermined first time data signal is held in a time corresponding to one vertical scanning period, and a predetermined second time black display signal is held .   The display device according to claim 1, wherein the predetermined physical quantity is a vehicle speed, a rotational speed of a motor, a remaining fuel amount, a remaining battery amount, a water temperature, or an inter-vehicle distance.   The change in the display brightness is at least temporarily than the display brightness when the predetermined physical quantity is outside the predetermined range when the predetermined physical quantity is within the predetermined range. The display device according to claim 1, wherein the display device is performed to be higher.   The display device according to claim 1, wherein the change in the display luminance is intermittently performed when the predetermined physical quantity falls within a predetermined range.   The display device according to claim 4, wherein the frequency of the intermittent display brightness change is increased or decreased according to a seriousness of a situation to be warned.   The display device according to claim 1, wherein the display luminance is changed so that black is intermittently displayed when the predetermined physical quantity falls within a predetermined range.   The display device according to claim 6, wherein the frequency of the intermittent black display is increased or decreased according to a seriousness of a situation to be warned.   The display device according to any one of claims 1 to 4 and 6, wherein the change in the display color is performed so that the seriousness of the situation to be warned is indicated by each display color.   The change in the display luminance and the change in the display color are performed in combination, and the change in the display luminance is intermittently performed so that an increase or decrease in the frequency indicates a serious degree of a situation to be warned. Display device.   The display device according to claim 1, wherein the change in display luminance and / or the change in display color is performed in a part of a display area.   The display device according to claim 1, wherein the change in display luminance and / or the change in display color is performed in the entire display area.   The display device according to claim 1, wherein the change in the display luminance and / or the change in the display color is performed in an area where the predetermined physical quantity is displayed in a display area.   The display device according to claim 12, wherein the change in the display luminance and / or the change in the display color is also performed in a region where the predetermined physical quantity is not displayed in the display region.   The display device according to claim 1, wherein the predetermined physical quantity is a physical quantity that is not displayed in a display area. The display device according to claim 1, further comprising a lighting device disposed on a back side of the liquid crystal panel, wherein the display luminance can be changed by changing a luminance of the lighting device. By varying the signal supplied from the previous SL drive circuit, a display device according to any one of claims 1 to 15 capable of performing a change or changes in the display color of the display brightness. According to any one of claims 1 to 16 capable of performing a change in the display luminance by the data signal is held first time and the black display signal to vary the ratio between the second time to be held Display device. Instrument panel comprising the display device according to any one of claims 1-17. A motor vehicle comprising the instrument panel according to claim 18 .

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