JP2022177629A - Display unit and on-vehicle display system using the same - Google Patents

Abstract

To prevent an increase in power consumption while increasing the ease of viewing a solar radiation area in a situation where part of a self-luminous display is exposed to solar radiation.SOLUTION: A display unit has a solar radiation estimation unit 12c that executes brightness control of a self-luminous display including a plurality of pixels formed of self-luminous elements, and estimates a solar radiation area that is an area of a display surface of the display exposed to solar radiation. The solar radiation estimation unit 12c includes a position calculation unit 12c1 that calculates a solar position, a direction estimation unit 12c2 that estimates a solar radiation direction to the display, and a database unit 12c4 that stores a plurality of pieces of solar radiation area data indicating the distribution of the solar radiation areas corresponding to the solar radiation direction and non-solar radiation areas. The solar radiation estimation unit 12c further has a data selection unit 12c3 that selects, from a data group consisting of the plurality of pieces of solar radiation area data, solar radiation area data corresponding to the estimated solar radiation direction.SELECTED DRAWING: Figure 2

Description

The present invention relates to a display device capable of controlling the display of a self-luminous display such as an organic light emitting diode (OLED), and an in-vehicle display system using the same.

2. Description of the Related Art Conventionally, there has been proposed a display device capable of improving visibility of a screen by performing brightness control when the display is exposed to sunlight (for example, Patent Document 1). The device described in Patent Document 1 is a vehicle display device mounted on a mobile object such as an automobile, and automatically controls the brightness level of the entire display screen based on conditions such as the time of use and the vehicle's running position. It is configured to As a result, even without providing a sensor for detecting brightness, the brightness corresponds to the brightness of the surrounding environment in which the display device is mounted, and the visibility of the display screen is improved.

JP-A-11-184446

However, since this display device automatically controls the brightness level of the entire display screen in response to predetermined conditions, it is not possible to adjust the brightness level of only a partial area of the screen. For example, this display device raises the brightness level of the entire screen even in a situation where only a partial area of the display screen is exposed to sunlight, resulting in unnecessarily increased power consumption. Further, in such a situation, the visibility of the display screen is improved in the solar radiation area, but the display screen becomes brighter than necessary in the non-solar radiation area, and the visibility may deteriorate. From the viewpoint of reducing power consumption, control to increase the brightness level of the entire screen is not preferable, particularly when using an OLED display.

In view of the above points, the present invention provides a display device and an in-vehicle display system using the same in a situation where only a partial area of the screen of a self-luminous display is exposed to sunlight, and a solar radiation area and a non-solar radiation area. An object of the present invention is to suppress an increase in power consumption while maintaining visibility.

In order to achieve the above object, the display device according to claim 1 is a display device for controlling image display on a display (20) having a plurality of pixels composed of self-luminous elements, wherein the position of the sun is calculated. a direction estimating unit (12c2) for estimating the solar radiation direction with respect to the display based on the calculated position of the sun; Data consisting of a plurality of solar irradiation area data, with the solar irradiation area being the solar irradiation area, the remaining part of the display surface being the non-solar irradiation area, and the data showing the distribution of the solar irradiation area and the non-solar irradiation area on the display surface being the solar irradiation area data. A database unit (12c4) storing groups, a solar radiation estimating unit (12c) for estimating a solar radiation area based on the estimated solar radiation direction and a data group, A luminance control unit (12e) that performs luminance adjustment to make the luminance higher than the luminance of the non-solar area, and outputs a video output signal for displaying an image whose luminance has been adjusted by the luminance control unit on the display. and a video output unit (12f).

This display device calculates the position of the sun, estimates the solar radiation direction with respect to the display based on the calculated solar position, and stores a data group consisting of a plurality of solar radiation area data in the database. Then, this display device estimates a solar radiation area based on the estimated solar radiation direction and the data group, and executes brightness control to make the brightness of the solar radiation area higher than that of the non-solar radiation area. Therefore, in a situation where only a portion of the display is exposed to sunlight, the brightness of only the sun-exposed area can be increased, improving the visibility of the display screen. can be suppressed.

It should be noted that the reference numerals in parentheses attached to each component etc. indicate an example of the correspondence relationship between the component etc. and specific components etc. described in the embodiments described later.

1 is a block diagram showing an example of a display system according to a first embodiment; FIG. It is a block diagram which shows an example of a solar radiation estimation part. It is a figure which shows an example of a definition of a sun altitude. It is a figure which shows an example of the definition of a sun direction. It is a figure which shows an example of the definition of the altitude among panel mounting angles. It is a figure which shows an example of the definition of an orientation among panel mounting angles. It is a figure which shows an example of the definition of a vehicle direction. It is a figure which shows an example of insolation area data. FIG. 10 is an explanatory diagram for explaining selection of solar radiation area data corresponding to a panel incident angle; 4 is a flow chart showing an example of brightness control in the display system of the first embodiment; It is a block diagram which shows the modification of the display system of 1st Embodiment. 9 is a flowchart showing a modification of brightness control in the display system of the first embodiment; It is a block diagram which shows the solar radiation estimation part based on the display system of 2nd Embodiment. FIG. 4 is a diagram showing solar radiation area data corresponding to a certain panel incident angle and its characteristic points; FIG. 10 is a diagram showing solar radiation area data corresponding to other panel incident angles and its characteristic points; FIG. 5 is an explanatory diagram for explaining estimation of feature points corresponding to other panel incident angles based on feature points of two pieces of solar radiation area data corresponding to different panel incident angles; It is a figure which shows an example of the solar radiation area estimation based on two solar radiation area data. FIG. 11 is a diagram showing another example of solar radiation area estimation in the display system of the second embodiment; FIG. 11 is a block diagram showing an example of a display system according to a third embodiment; FIG. FIG. 12 is a block diagram showing an example of a display system according to a fourth embodiment; FIG. It is an explanatory view for explaining correction of solar radiation area data in a 4th embodiment. FIG. 14 is a flowchart showing an example of correction processing for solar radiation area data in the fourth embodiment; FIG.

An embodiment of the present invention will be described below with reference to the drawings. In addition, in each of the following embodiments, portions that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
An OLED display system to which the display device of the first embodiment is applied will be described. In this embodiment, the case where the OLED display system is an in-vehicle display system for a vehicle such as an automobile will be described as a representative example, but it is of course possible to apply it to other uses. An OLED display system may also be called an "organic EL (electroluminescence) display system" or an "EL display system."

[Basic configuration]
The OLED display system of the present embodiment includes, for example, a drawing controller 10, a display 20, a sensor section 30, and an in-vehicle device 40 as shown in FIG.

The drawing controller 10 corresponds to a display device that controls image display on the display 20, and controls image display on the display 20 based on detection signals from the sensor unit 30 and various signals transmitted from the in-vehicle device 40. do. The drawing controller 10 is directly connected to the display 20 and the sensor unit 30 via connection wiring. connected through For this reason, detection signals from the sensor unit 30 and various signals from the in-vehicle equipment 40 are input to the drawing controller 10 directly or through the in-vehicle LAN 50 . A detailed configuration of the drawing controller 10 will be described later.

The display 20 is composed of, for example, a display having a plurality of pixels composed of self-luminous elements such as OLEDs, and performs image display corresponding to video output signals from the drawing controller 10 . The display 20 has a configuration in which the brightness level can be adjusted by applying a variable drive voltage to each self-luminous element forming a display area for displaying an image, that is, to each pixel.

In this specification, a case where the display 20 is an OLED display will be described as a representative example, but since self-luminous displays such as OLED displays are well known, detailed description of the display itself will be omitted. As the self-luminous element, an OLED will be described as a typical example, but the present invention is not limited to this, and other self-luminous elements such as an inorganic EL and a micro LED may be used.

The sensor unit 30 is for detecting the amount of solar radiation on the display 20, and for example, detects the amount of solar radiation for each partitioned area of the display 20. FIG. For example, as shown in FIG. 1, the sensor unit 30 is composed of three illuminance sensors, a first illuminance sensor 31, a second illuminance sensor 32 and a third illuminance sensor 33, but the number of illuminance sensors is arbitrary. . In the case where the number of illuminance sensors is three, for example, an area for displaying images in the display 20 is set as a display area, and the display area is divided into three areas of a first area, a second area, and a third area, Illuminance sensors 31-33 are associated with one of the first to third areas, respectively. Then, the illuminance of the first area is detected by the first illuminance sensor 31, the illuminance of the second area is detected by the second illuminance sensor 32, and the illuminance of the third area is detected by the third illuminance sensor 33, and a detection signal indicating the detection result is generated by the drawing controller. 10.

When the sensor unit 30 is composed of a plurality of illuminance sensors, the arrangement of the illuminance sensors and the corresponding area of the display area are arbitrary, and are not limited to the above examples, and can be changed as appropriate.

The in-vehicle device 40 includes a device for inputting a video signal to the drawing controller 10, a device for inputting vehicle information to the drawing controller 10, and the like. Here, a navigation device 41 , a multimedia device 42 , an air conditioner (hereinafter referred to as an air conditioner) 43 , and a vehicle ECU (Electronic Control Unit) 44 are provided as on-vehicle devices 40 . However, the in-vehicle device 40 shown here is merely an example, and devices other than those shown here may be used.

Based on the map information stored in the map database, the navigation device 41 inputs to the drawing controller 10 a video signal indicating the current position of the vehicle and a map image. In addition, the navigation device 41 inputs, to the drawing controller 10, a video signal indicating, for example, a video for setting a destination, a video relating to information on facilities and shops around the vehicle or around the destination, and the like, based on the user's operation. do. Furthermore, the navigation device 41 acquires information on the latitude, longitude, current time, and direction of the vehicle from, for example, a known GPS (Global Positioning System), and inputs this information to the drawing controller 10. ing.

The multimedia 42 can combine various types and formats of media such as characters, images, moving images, and voices and handle them in a complex manner. Media is a device or medium that records, transmits, or stores information. In vehicles, it is a media that provides video as a display image such as a TV broadcast station or a video site, or a USB (Universal Serial Serial Bus) that records videos. Bus) This corresponds to recording media such as memory. The multimedia 42 inputs video signals from these media to the drawing controller 10 through wireless communication or a communication bus such as a USB cable.

The air conditioner 43 performs air conditioning control in the vehicle, and inputs various information related to air conditioner control from an air conditioner ECU corresponding to the controller to the drawing controller 10 . For example, a control signal corresponding to mode selection of the air conditioner 43 is input to the drawing controller 10 .

The vehicle ECU 44 acquires information about various vehicles and inputs the information to the drawing controller 10 . For example, the vehicle ECU 44 inputs to the drawing controller 10 information indicating the tilt angle of the vehicle, that is, the vehicle state such as the tilt of the vehicle due to a slope. As described above, in the present embodiment, information on the latitude and longitude, the current time, and the orientation of the vehicle is input from the navigation device 41 to the drawing controller 10, but the vehicle ECU 44 receives this information. sometimes deal with it. In that case, such information may be input from the vehicle ECU 44 to the drawing controller 10 .

The above is the basic configuration of the OLED display system.

[Drawing Controller]
Next, a detailed configuration of the drawing controller 10 will be described.

As described above, the drawing controller 10 controls image display on the display 20, and has a configuration including a communication unit 11, a control unit 12, and an external storage device 13 as functional units for realizing this. It is

The communication unit 11 is a part that acquires information from the in-vehicle device 40 through the in-vehicle LAN 50 . Signals and information transmitted from the in-vehicle device 40 to the in-vehicle LAN 50 are acquired by the communication unit 11 . FIG. 1 shows acquisition paths through which information and video signals can be directly input to the drawing controller 10 and acquisition paths through the communication unit 11 for the navigation device 41 and the multimedia 42 . As described above, the information and video signal acquisition route from the vehicle-mounted device 40 is arbitrary. can be

The control unit 12 is configured by, for example, a microcomputer including a CPU, ROM, RAM, I/O, and the like. The control unit 12 reads out and executes various programs stored in the external storage device 13 to output images displayed on the display 20 based on video signals and information transmitted from the in-vehicle device 40 . Further, here, the control section 12 receives a detection signal from the sensor section 30 and adjusts the luminance level of each area of the display 20 based on the detection signal. Specifically, the control unit 12 includes an image input/coupling unit 12a, a drawing unit 12b, a solar radiation estimation unit 12c, an illuminance acquisition unit 12d, a brightness control unit 12e, and an image output unit 12f.

The video input/coupling unit 12a receives a video signal directly from the in-vehicle device 40 or via the in-vehicle LAN 50, and outputs image data indicated by the video signal to the brightness control unit 12e. If there is image data drawn by the drawing unit 12b, the video input/combining unit 12a inputs it, combines it with the image data indicated by the video signal, and outputs the combined image data to the brightness control unit 12e. do.

The drawing unit 12b receives various information related to air conditioner control transmitted from the air conditioner 43 and information related to various vehicles transmitted from the vehicle ECU 44, which are acquired by the communication unit 11, and image data for rendering the information on the display 20. to generate

The solar radiation estimating unit 12c acquires, for example, date and time information, the position of the own vehicle V, and vehicle attitude information from the vehicle-mounted device 40, and based on this information, the solar radiation direction to the display 20 and the solar radiation area that is the area where the sun is irradiated. is estimated, and the estimation result is output to the brightness control unit 12e. The details of the solar radiation estimation unit 12c will be described later.

The illuminance acquisition unit 12d receives output signals from the illuminance sensors 31 to 33 constituting the sensor unit 30, and acquires "environmental illuminance", which is the illuminance of the environment in which the display 20 is installed. The illuminance acquisition unit 12d outputs, for example, an electric signal corresponding to the environmental illuminance to the luminance control unit 12e as illuminance information.

The luminance control unit 12e controls the image data input from the video input/coupling unit 12a by adjusting the pixel group located in the solar radiation area (hereinafter referred to as the “solar pixel group” for convenience) among the pixel groups constituting the display 20. ), and outputs the data to the video output unit 12f. For example, the brightness control unit 12e determines a group of solar pixels to be subjected to brightness control based on the solar radiation area estimated by the solar radiation estimation unit 12c, and determines the solar radiation pixels based on the environmental illumination obtained from the illumination acquisition unit 12d. Image data is generated in which the set brightness of the group is increased. Then, the luminance control unit 12e outputs image data in which the set luminance of the solar pixel group is adjusted, for example, to the video output unit 12f.

Note that the brightness adjustment by the brightness control unit 12e may be performed only on a part of the solar pixel group, or may be performed on only a part of the solar pixel group, as long as the visibility of the portion of the solar radiation area in the displayed image on the display 20 is improved. may be performed on all of For example, the brightness control unit 12e performs adjustment to increase the brightness of all the solar pixel groups when it is desirable to improve the visibility of the entire solar radiation area, such as when the display image is an image of the outside of the vehicle. can be executed. In addition, the brightness control unit 12e, for example, when it is desirable to improve the visibility of only a part of the solar irradiation area, such as when the display image is composed of an information part such as text and a non-information part such as the background of the screen, , only the part of the solar pixel group that displays the information part can be subjected to brightness adjustment. In the latter case, by improving the luminance level of the information portion while maintaining or lowering the luminance level of the background portion, the effect of increasing the contrast and making the displayed image more visible is expected. In this way, the brightness control unit 12e can be configured to perform brightness adjustment of part or all of the solar pixel group.

The video output unit 12f outputs a video output signal so that the display 20 displays the image data after brightness adjustment transmitted from the brightness control unit 12e.

The external storage device 13 stores various programs to be executed by the control unit 12 and various data transmitted from the control unit 12, and enables the control unit 12 to read programs and write data. Here, the external storage device 13 is used as the non-transition tangible recording medium, and is configured separately from the control unit 12. However, the ROM or RAM within the control unit 12 may be used.

The above is the basic configuration of the drawing controller 10 .

[Solar radiation estimation part]
Next, the configuration of the solar radiation estimator 12c will be described with reference to FIGS. 2 to 9. FIG.

In FIGS. 5 and 6, both the display 20 and the vehicle V are shown in order to facilitate understanding of the relationship between the orientation of the display 20 and the orientation of the vehicle V. For convenience, the size of the vehicle V is shown on the display. smaller than 20.

For example, as shown in FIG. 2, the solar radiation estimator 12c includes a position calculator 12c1, a direction estimator 12c2, a data selector 12c3, and a database 12c4.

The position calculator 12c1 calculates the position of the sun, for example, based on the vehicle position information of the latitude of the point where the vehicle is located from the navigation device 41 and the date and time information. Specifically, based on the above-described information acquired from the vehicle-mounted device 40, the position calculation unit 12c1 determines the altitude angle θ ₁ of the sun relative to the vehicle V shown in FIG. Calculate the azimuth angle _φ1 .

Note that the altitude angle θ ₁ and the azimuth angle φ ₁ are obtained by a known method, for example, by designating the latitude of the point of the vehicle V and calculating them by a spherical trigonometry formula using the solar declination and hour angle. be done. The position calculator 12c1 calculates the altitude angle θ ₁ and the azimuth angle φ ₁ as the position of the sun by the known method described above.

For example, as shown in FIG. 3, the altitude angle _.theta.1 is set with the ground plane on which the vehicle V equipped with the display 20 is positioned as a reference (0.degree.), and the virtual straight line connecting the vehicle V and the sun and the ground plane. is defined as the acute angle between For example, the altitude angle θ ₁ is positive when the sun is positioned above the vehicle V, and negative when the sun is positioned below the vehicle V (toward the ground). A value within the range of

For example, as shown in FIG. 4 , the azimuth angle φ ₁ is the first angle that connects the vehicle V and the sun with the traveling direction of the vehicle V as a reference (0°) when the vehicle V is viewed from above. It is defined as an angle formed by a virtual straight line and a second virtual straight line connecting the reference position and the own vehicle V. FIG. The azimuth angle φ ₁ is, for example, the right direction of the vehicle V is 90°, the rear direction of the vehicle V is 180°, and the left direction of the vehicle V is 270°. and is a value within the range of 0° to 360°.

In addition, the "traveling direction of the own vehicle V" is a direction along the entire length of the own vehicle V, and means a direction from the passenger compartment side to the windshield side. "Backward direction of own vehicle V" means a direction opposite to the traveling direction. "Right direction of own vehicle V" and "left direction of own vehicle V" are directions along the vehicle width direction of own vehicle V, respectively, which are the right direction and left direction when facing the traveling direction. means. In the following, "forward direction", "backward direction", "rightward direction" and "leftward direction" refer to the above directions.

The position calculation unit 12c1 outputs the information to the direction estimation unit 12c2, for example, using the altitude angle θ ₁ and the azimuth angle φ ₁ calculated according to the above definitions as solar position information.

The direction estimator 12c2 estimates the direction of solar radiation with respect to the display surface 20a of the display 20 based on the solar position information, the mounting information of the display 20 with respect to the own vehicle V, and the vehicle attitude information of the own vehicle V. FIG. Mounting information of the display 20 is, for example, panel mounting angles θ ₂ and φ ₂ which are mounting angles of the display 20 with respect to the own vehicle V shown in FIGS. 5 and 6 . The vehicle posture information is, for example, as shown in FIG. 7, an angle corresponding to yaw among the vehicle postures of yaw, roll, and pitch of the vehicle V, and the vehicle angle that is the direction indicated by the traveling direction of the vehicle V. _φ3 .

As shown in FIG. 5, for example, the panel mounting angle _θ2 is defined as the direction indicated by the normal to the display surface 20a of the display 20 mounted on the vehicle V when viewed from the side. For example, the panel mounting angle _θ2 is determined with the rear direction of the vehicle V as the reference (0°) in a side view, the upper side of the vehicle V being positive, and the lower side of the vehicle V, that is, the ground plane side being negative. , -180° to 180°. The panel mounting angle θ ₂ corresponds to the altitude angle θ ₁ of the sun.

The panel mounting angle φ ₂ is defined as the direction indicated by the normal direction to the display surface 20a of the display 20 mounted on the vehicle V when viewed from above, as shown in FIG. 6, for example. For example, the panel mounting angle θ ₂ is -180 with the rear direction of the vehicle V as the reference (0°), the left direction of the vehicle V being positive, and the right direction of the vehicle V being negative. A value within the range of ° to 180°. The panel mounting angle φ ₂ corresponds to the azimuth angle φ ₁ of the sun.

The panel mounting angles θ ₂ and φ ₂ are set in advance based on the mounting state of the display 20, and are stored as data in the external storage device 13 or a storage medium such as ROM or RAM (not shown) in the control unit 12. .

The vehicle angle _φ3 is defined as the direction indicated by the traveling direction of the own vehicle V when viewed from above, as shown in FIG. 7, for example. The vehicle angle _φ3 is, for example, based on the north (0°), the east at 90°, the south at 180°, and the west at 270°. Vehicle angle φ ₃ corresponds to sun azimuth angle φ ₁ and panel mounting angle φ ₂ . The vehicle angle _φ3 is acquired by, for example, a gyro sensor (not shown) mounted on the host vehicle V or the like.

The direction estimator 12c2, for example, based on the above angles, determines the solar radiation direction with respect to the display surface 20a of the display 20 based on the panel incident angle _φa corresponding to the angle of the azimuth direction of the sun and the angle of the altitude direction of the sun. Calculate the corresponding panel incident angle θ _a .

In calculating the panel incident angle _φa , the direction estimator 12c2 first calculates the incident angle _φ0 given by the following equation (1).

φ ₀ = φ ₁ - φ ₂ - (φ ₃ - 180) (1)
The panel incident angle _φa is defined, for example, in the same manner as the panel mounting angle _φ2 shown in FIG. 6, and is preferably a value within the range of -180° to 180°. Since the direction estimating unit 12c2 sets the panel incident angle φ _a within the range of −180° to 180°, when the incident angle φ ₀ is smaller than −540°, the panel incident angle φ _a is φ ₀ +720°. process. When the incident angle φ ₀ is −540° or more and smaller than −180°, the direction estimation unit 12c2 sets φ ₀ +360° as the panel incident angle φ _a , and the incident angle φ ₀ is in the range of −180° to 180°. If it is within the range, processing is performed to set the incident angle φ ₀ to the panel incident angle φ _a . The direction estimator 12c2 sets φ 0 −360° as the panel incident angle φ a when the incident angle φ ₀ is greater than 180° and 540° or less, and sets φ ₀ −360° as the panel incident angle _{φ a} when the incident angle φ ₀ is greater than 540°. Processing is performed with _0-720 ° as the panel incident angle _φa . By performing the above calculation process, the panel incident angle φ _a is within the range of −180° to 180°.

When the value of the panel incident angle φ _a is within the range of −90° to 90°, that is, when sunlight is incident from the display surface 20a side, the direction estimator 12c2 calculates the following formula (2 ) is _calculated .

θ ₀₀ = θ ₁ - θ ₂ (2)
On the other hand, when the value of the panel incident angle φ _a is within the range of −180° to −90° or 90° to 180°, that is, when the sunlight is incident from the opposite side of the display surface 20a, direction estimation The part 12c2 calculates the incident angle θ ₀₁ represented by the following formula (3).

θ ₀₁ =(90−θ ₁ ×2)+θ ₁ −θ ₂ (3)
The panel incident angle _θa is defined, for example, in the same manner as the panel mounting angle _θ2 shown in FIG. 5, and is preferably a value within the range of -180° to 180°. Since the direction estimator 12c2 sets the panel incident angle _θa within the range of −180° to 180°, if _θ00 or _θ01 is smaller than −180°, 360° is set to _θ00 or _θ01 . A process is performed in which the added value is used as the panel incident angle _θa . When θ ₀₀ or θ ₀₁ is greater than 180°, the direction estimator 12c2 performs a process of setting a value obtained by subtracting 360° from θ ₀₀ or θ ₀₁ as the panel incident angle θ _a . When θ ₀₀ or θ ₀₁ is within the range of −180° to 180°, the direction estimator 12c2 performs processing to set θ ₀₀ or θ ₀₁ as the panel incident angle θ _a . By performing the above calculation process, the panel incident angle _θa is within the range of −180° to 180°.

Note that the calculation method for setting the panel incident angles θ _a and φ _a within the range of −180° to 180° is not limited to the above method, but is a method of dividing by 180 and calculating the remainder. may be changed as appropriate.

The direction estimator 12c2 estimates the calculated panel incident angles θ _a and φ _a as solar radiation directions, and outputs a signal corresponding to the calculation result to the data selector 12c3.

The data selection unit 12c3 selects one piece of insolation area data corresponding to the estimation result from the database unit 12c4 based on the estimation result of the solar radiation direction acquired from the direction estimation unit 12c2. The data selection unit 12c3 outputs the selected solar radiation area data to the luminance control unit 12e as solar radiation area information.

For example, as shown in FIG. 8, the insolation area data is data indicating the distribution of the insolation area, which is an area exposed to insolation, and the non-insolation area, which is the remaining area, on the display surface 20a of the display 20. FIG. The insolation area data is, for example, binarized image format data of white corresponding to the insolation area and black corresponding to the non-insolation area, and is associated with coordinates on the display surface 20 a of the display 20 . That is, the pixel group located in the area associated with the solar radiation area in the solar radiation area data is the solar radiation pixel group, and brightness control is performed by the brightness control unit 12e. For example, as shown in FIG. 9, the solar radiation area data are created in advance one by one corresponding to different panel incident angles θ _a and φ _a and stored in the database section 12c4. The solar radiation area data is created, for example, by setting the solar position, that is, the panel incident angles θ _a and φ _a using optical simulation software based on the 3D data of the vehicle V on which the display 20 is mounted.

The data selection unit 12c3 selects one solar radiation area data closest to the calculated panel incident angles θ _a and φ _a from the data group consisting of a plurality of solar radiation area data stored in the database unit 12c4. For example, when the calculated _panel incident _angles θ _a and φ _a are −3° and 58°, respectively, as shown in FIG. Select one 60° insolation area data.

The database unit 12c4 stores, for example, a plurality of solar radiation area data for each panel incident angle _θa , _φa , and is an arbitrary storage medium such as ROM or RAM. Note that the solar radiation area data stored in the database unit 12c4 is not limited to an example in which each of the panel incident angles θ _a and φ _a has an interval of 10° as shown in FIG. 9, and may have an interval of 5°. can be appropriately changed according to the capacity, the processing power of the CPU, and the like.

The above is the basic configuration of the solar radiation estimation unit 12c.

[Brightness control]
Next, an example of luminance control processing in an OLED display system will be described with reference to FIG.

The OLED display system executes the control flow shown in FIG. 10 when a predetermined start condition is satisfied, such as when the display 20 is turned on.

At step S<b>100 , the control unit 12 acquires a detection signal from the sensor unit 30 . Thereby, the detection signals of the first illuminance sensor 31, the second illuminance sensor 32, and the third illuminance sensor 33 are obtained, and the illuminance of the environment where the display 20 is installed is detected.

Subsequently, the control unit 12 advances the process to step S110, acquires the position information and date/time information of the own vehicle V from the in-vehicle device 40, and calculates the altitude angle θ ₁ and the azimuth angle φ ₁ of the sun by the method described above. .

Next, the control unit 12 advances the process to step S120, acquires the attitude information (vehicle angle φ ₃ ) of the own vehicle V from the in-vehicle device 40, and determines the panel mounting angles θ ₂ and φ ₂ and the altitude angle θ ₁ of the sun. and the azimuth angle φ ₁ , the panel incident angles θ _a and φ _a are calculated. Thereby, the solar radiation direction with respect to the display surface 20a of the display 20 is estimated.

Then, the control unit 12 advances the process to step S130, and based on the solar radiation direction estimated in step S120, one solar radiation area corresponding to the solar radiation direction estimated from the plurality of solar radiation area data stored in the database unit 12c4. Select data. Thereby, the solar radiation area on the display surface 20a of the display 20 is estimated.

Finally, the control unit 12 advances the process to step S140 and executes brightness control by the brightness control unit 12e. Specifically, the brightness control unit 12e sets the pixel group associated with the solar radiation area, that is, the solar radiation pixel group, among the solar radiation area data selected in step S130, as the brightness control target. Then, based on the environmental illuminance output from the illuminance acquisition unit 12d, the luminance control unit 12e performs processing to increase the luminance of the solar pixel group in order to improve visibility in the environmental illuminance. Subsequently, the video output unit 12f outputs the video signal after luminance control to the display 20 based on the output signal from the luminance control unit 12e. After that, the control unit 12 returns the process to step S100.

As a result, in the display 20, when part of the display surface 20a is exposed to sunlight, the brightness is controlled at the pixel level, and the brightness of the portion of the display image located in the sunlight area is increased. Improves ease.

The above brightness control is merely an example, and the processing of step S100 may be performed after step S130 or in parallel with step S130, and the order of the processing may be changed as appropriate within a possible range. may

According to the present embodiment, after estimating the solar radiation direction of the display 20 based on the position information of the own vehicle V, the driving direction, date and time information, and the mounting information of the display 20, the solar radiation area is estimated based on the estimated solar radiation direction. and an OLED display system that performs brightness control. As a result, it is possible to highly accurately estimate the solar pixel group located in the solar irradiation area among the pixel groups constituting the display 20, and to selectively improve the brightness of some or all of the solar pixel group. The visibility of the displayed image is improved. In addition, it is no longer necessary to increase the brightness level of the entire display 20 to improve visibility, and by selectively increasing the brightness level of the solar pixel group, an increase in power consumption accompanying improvement in visibility is suppressed. can.

In the above description, the luminance adjustment is performed when only a part of the display 20 is in the solar radiation area. will be For example, when the entire area of the display 20 is the solar radiation area, based on the estimation result of the amount of solar radiation, luminance adjustment is performed at the pixel level for display content locations requiring luminance adjustment among the entire area of the display 20 . Also, the brightness level of character display is set to a height corresponding to the estimated amount of solar radiation. In this way, even when the entire area of the display 20 is a solar radiation area, it is possible to suppress an increase in power consumption by adjusting the luminance level at the pixel level and limiting the portions to be raised. Furthermore, when the entire area of the display 20 is a non-solar area, the control unit 12 does not perform the solar area estimation, and executes luminance control based on the environmental illuminance obtained from the illuminance sensors 31 to 33. good too. In this case, the control unit 12 performs luminance control at the pixel level for display portions of the display 20 that require luminance adjustment, based on the environmental illuminance.

(Modified example of the first embodiment)
For example, as shown in FIG. 11, the OLED display system of the first embodiment may be configured to have an illuminance estimation unit 12g instead of the illuminance acquisition unit 12d without the sensor unit 30. FIG.

In this case, the in-vehicle device 40 includes a communication device 45 capable of acquiring weather information in the position (area) of the own vehicle where the display 20 is installed. The communication device 45 acquires weather information via the Internet using, for example, a wireless LAN or the like, and outputs the weather information to the communication unit 11 via the in-vehicle LAN 50 .

The illuminance estimation unit 12g estimates the environmental illuminance based on the acquired weather information. In this modified example, for example, reference illuminance data corresponding to time is stored in the external storage device 13 or the like, and the illuminance estimator 12g estimates the environmental illuminance based on the weather information and the reference illuminance. Specifically, for example, the illuminance estimation unit 12g sets the environmental illuminance to 100% of the reference illuminance when the weather is fine, 70% of the reference illuminance when the weather is cloudy, and 30% of the reference illuminance when it is raining. estimated as

As a result, even if the vehicle V is not equipped with the illuminance sensors 31 to 33, the OLED display system can estimate the environmental illuminance of the display 20 and execute the brightness control of the display 20.

Further, the OLED display system may be configured not to execute luminance control when the entire display 20 is in the solar radiation area and the luminance control is unnecessary. In this case, the OLED display system executes the control flow shown in FIG. 12, for example.

The OLED display system starts the process of step S101, for example, when a predetermined start condition such as the display 20 being turned on is satisfied. In step S101, the control unit 12 acquires the environmental illuminance from the sensor unit 30, or estimates the environmental illuminance based on weather information and time information.

Subsequently, in step S102, for example, the control unit 12 determines whether or not the environmental illuminance is equal to or greater than a predetermined threshold value. The processing is returned to step S101. The predetermined threshold value is appropriately set in consideration of the visibility of the image with the naked eye.

After that, when the determination in step S101 is affirmative, the control unit 12 sequentially executes the processes of steps S110 to S140, as in the first embodiment.

As a result, even when the entire area of the display surface 20a of the display 20 is a solar radiation area, the OLED display system can perform unnecessary brightness control in a situation where the visibility of the display screen has not deteriorated. Therefore, an increase in power consumption can be suppressed.

It should be noted that the determination processing in step S102 is merely an example, and other condition settings that can determine the visibility of the display surface 20a, such as "whether the time is between morning and evening". I don't mind.

According to the above modified example, the OLED display system can obtain the following effects in addition to the effects of the first embodiment.

(1) According to the first modification, even if the own vehicle V does not have the illuminance sensors 31 to 33, it is possible to estimate the environmental illuminance of the display 20 and control the brightness of the solar pixel group.

(2) According to the second modification, even if the entire display surface 20a of the display 20 is exposed to sunlight, the environmental illuminance is low and the visibility of the displayed image is not hindered. It is possible to further suppress an increase in power consumption without performing unnecessary luminance control.

(Second embodiment)
An OLED display system according to the second embodiment will be described with reference to FIGS. 13 to 17. FIG. In FIG. 14, in order to facilitate the understanding of the association of feature points, which will be described later, a plurality of associated feature points are shown connected by dashed lines for convenience. Also, the vertical and horizontal axes in FIG. 16 are, for example, the vertical coordinate y and the horizontal coordinate x, respectively, in the solar radiation area data.

The OLED display system of the present embodiment differs from the first embodiment in that the solar radiation estimator 12c further includes a region interpolator 12c5 as shown in FIG. 13, for example. In this embodiment, this difference will be mainly described.

In this embodiment, the data selector 12c3 of the solar radiation estimator 12c selects at least two pieces of solar radiation area data that are close to the panel incident angles θ _a and φ _a estimated by the direction estimator 12c2. Then, the solar radiation estimating section 12c is configured to interpolate the solar radiation area corresponding to the estimated panel incident angle based on the plurality of solar radiation area data selected by the data selecting section 12c3.

Hereinafter, for simplification of explanation, the solar radiation area data selected by the data selection unit 12c3 will be referred to as "selected data", and the panel incident angle estimated by the direction estimation unit 12c2 will be referred to as "estimated incident angle". Also, the case where θ _a and φ _a of the panel incident angle or the estimated incident angle are α° and β°, respectively, is defined as the panel incident angle (α°, β°) or the estimated incident angle (α°, β°), or It is simply called (α°, β°).

Specifically, for example, the data selection unit 12c3 selects the first solar radiation area data corresponding to the panel incident angle closest to the estimated incident angle from among the plurality of solar radiation area data stored in the database unit 12c4. do. Next, the data selector 12c3 selects the second solar radiation area data corresponding to the panel incident angle closest to the estimated incident angle next to the first solar radiation area data. For example, in the case of the estimated incident angles (-3°, 58°) by the direction estimating unit 12c2, the data selecting unit 12c3 selects two pieces of solar radiation area data shown in FIGS. 14 and 15, for example. The solar radiation area data shown in FIG. 14 correspond to the panel incident angles (0°, 60°) and correspond to the first solar radiation area data. The solar radiation area data shown in FIG. 15 corresponds to the panel incident angles (−10°, 60°) and corresponds to the second solar radiation area data.

The number of selection data used in the area interpolation unit 12c5 is, for example, two, but may be three or more.

A plurality of insolation area data stored in the database unit 12c4, for example, as shown in FIG. 14 and FIG. It is set as a "feature point". This feature point is associated with the structure of the vehicle on which the display 20 is mounted, and changes according to the panel incident angle. For example, two feature points enclosed by broken lines among the feature points shown in FIG. 14 correspond to two feature points enclosed by broken lines among the feature points shown in FIG. Change. Further, the characteristic point of the solar radiation area data is associated with one characteristic point corresponding to the characteristic point among the solar radiation area data having different panel incident angles, as shown in FIG. 16, for example. At this time, since the two selected solar radiation area data are data different from the estimated panel incident angle, the feature point and the feature point corresponding to the estimated panel incident angle have different coordinates. there is

The area interpolation unit 12c5 sets the feature point corresponding to the estimated panel incident angle as an "estimated feature point", calculates an estimated feature point located between the two selected data based on the feature points, and calculates the estimated feature point of the solar radiation area. Interpolate. For example, as shown in FIG. 17, the region interpolation unit 12c5 generates solar radiation region data at the estimated panel incident angle based on two selected data with different panel incident angles and feature points of the selected data. Specifically, the region interpolating unit 12c5, for example, based on the feature point of the selection data of the panel incident angle (−10°, 60°) and the feature point of the panel incident angle (0°, 60°), Calculate the coordinates of the estimated feature point at the angles (-3°, 60°). Then, the region interpolation unit 12c5 corrects the outline of the non-solar region based on the calculated coordinates of the estimated feature point, and generates solar region data corresponding to the panel incident angles (-3°, 60°). In other words, the area interpolation unit 12c5 updates the associated feature points based on the two pieces of insolation area data to generate new insolation area data. Then, the solar radiation estimator 12c outputs the solar radiation region data generated by the region interpolator 12c5 to the luminance controller 12e as the solar radiation region information corresponding to the estimated incident angles (-3°, 58°).

The structure of the own vehicle with which the feature points are associated includes, for example, a pillar, a steering wheel, and a seat. In addition, the region interpolation unit 12c5 may generate the solar radiation region data based only on the estimated feature points, or may select one of the selected data based on the estimated feature points. A correction method may be used. The solar radiation area data generated by the area interpolating section 12c5 may be stored in the database section 12c4 or the external storage device 13, and may be made selectable by the data selecting section 12c3.

This embodiment also provides an OLED display system that achieves the effects of the first embodiment. In addition, the OLED display system of this embodiment also provides the following effects.

(1) In the present embodiment, the solar radiation estimator 12c selects solar radiation area data corresponding to a plurality of panel incident angles close to the estimated incident angle, and based on these selected data, generates solar radiation area data at the estimated incident angle. Generate. Therefore, the insolation area data generated corresponding to the estimated incident angle are closer to the actual insolation area and non-insolation area on the display 20 . Therefore, compared to the first embodiment, the accuracy of estimating the insolation area and the accuracy of brightness control are improved, and the visibility of the displayed image on the display 20 and the effect of suppressing the increase in power consumption can be further enhanced.

(Modification of Second Embodiment)
In the above-described second embodiment, the example of generating the solar radiation area data of the panel incident angle _θa corresponding to the altitude among the estimated incident angles based on the two selection data has been described. Further, the region interpolating unit 12c5 may perform similar processing on the panel incident angle _φa corresponding to the azimuth among the estimated incident angles.

Specifically, in the case of the estimated incident angles (−3°, 58°), the region interpolating unit 12c5 converts the panel incident angles (0°, 60°) and the panel incident angles (−10°) as shown in FIG. 18, for example. degree, 60°), the first estimation data of the solar radiation area is generated. The estimated data of the first solar radiation area correspond to the panel incident angles (-3°, 60°).

Next, the region interpolating unit 12c5 calculates the panel incident angles (-3°, 50°) based on the two solar radiation region data of the panel incident angles (0°, 50°) and the panel incident angles (-10°, 50°). ) to generate the estimated data of the second insolation area corresponding to .

Then, the region interpolating unit 12c5 calculates the estimated data of the first solar radiation region corresponding to the panel incident angles (−3°, 60°) and the second solar radiation region corresponding to the panel incident angles (−3°, 50°). Based on the estimation data of the area, a process of generating the estimation data of the third insolation area is performed. The estimated data of the third solar radiation area correspond to estimated incident angles (-3°, 58°). The region interpolating unit 12c5 outputs the estimation data of the third solar irradiation region to the brightness control unit 12e as solar irradiation region information.

According to this modified example, the following effects can be obtained in addition to the effects of the second embodiment.

(1) In this modified example, the control unit 12 generates solar radiation area data corresponding to both the altitude and the direction of the estimated incident angle, and executes luminance control based on this solar radiation area data. Therefore, the estimation accuracy of the insolation area and the accuracy of the brightness control are improved compared to the second embodiment, and the effect of improving the visibility of the display screen and suppressing the increase in power consumption can be further enhanced.

(Third Embodiment)
An OLED display system according to the third embodiment will be described with reference to FIG.

The OLED display system of the present embodiment includes an orientation sensor 46 as the in-vehicle device 40, and the solar radiation estimator 12c corrects the solar radiation area data based on the output signal from the orientation sensor 46. is different from the first embodiment. In this embodiment, this difference will be mainly described.

The attitude sensor 46 is a sensor attached to a structure of the own vehicle associated with the feature points of the solar radiation area data, the attitude or arrangement of which can be changed. The attitude sensor 46 is attached to a structural part of the own vehicle V, such as a seat, and outputs a signal corresponding to the attitude of the attached structural part and the position in the own vehicle. An output signal of the posture sensor 46 is output to the communication section 11 via the in-vehicle LAN 50 and used for processing in the solar radiation estimation section 12c.

In this embodiment, the solar radiation estimator 12c corrects the selected or generated solar radiation area data based on the output signals of the navigation device 41 and the posture sensor 46 as necessary. For example, when the sun is positioned behind the host vehicle and the sun position and the display 20 are connected by a straight line, when the seat of the seat is positioned on the straight line, the solar radiation area on the display surface 20a is the seat changes depending on the position of In such a case, the solar radiation estimator 12c acquires information on the orientation and position of the seat from the orientation sensor 46, and corrects the selected or generated solar radiation region data based on the information. That is, when the solar radiation to the display 20 is blocked and a movable structure exists in the own vehicle, the solar radiation estimation unit 12c corrects the solar radiation area data, and outputs a signal based on the corrected solar radiation area data to the brightness control unit 12e. output to

The OLED display system of this embodiment also provides the same effects as those of the first embodiment. This OLED display system also provides the following effects.

(1) In the present embodiment, when there is a structure that can change the solar radiation area on the display 20, the solar radiation area data is corrected based on the posture of the structure, etc., so the accuracy of estimating the solar radiation area is further improved. do. Therefore, compared to the first embodiment, it is possible to further enhance the effect of improving the visibility of the display screen and suppressing the increase in power consumption.

(Fourth embodiment)
An OLED display system according to the fourth embodiment will be described with reference to FIGS. 20 to 22. FIG.

The OLED display system of the present embodiment includes an in-vehicle camera 47 as the in-vehicle device 40, and the solar radiation estimator 12c corrects the solar radiation area data based on the image data captured by the in-vehicle camera 47. It is different from the above-described first embodiment in that In this embodiment, this difference will be mainly described.

The in-vehicle camera 47 captures an image of the front of the vehicle, for example, and outputs the captured image data to the communication unit 11 as an image outside the vehicle via the in-vehicle LAN 50 . This vehicle exterior image is used to detect a shield that blocks solar radiation to the vehicle.

Examples of the shield include, but are not limited to, any structure such as a building, a tree, a wall, a utility pole, or a large vehicle that shades the position of the own vehicle. Detection of the shielding object and estimation of the direction and size of the shielding object are performed by, for example, a known image analysis technique.

For example, in the present embodiment, when the control unit 12 determines that a shield exists based on the image outside the vehicle, the solar radiation estimation unit 12c calculates a shadow area generated on the display 20 by the shield, to correct the insolation area data. For example, as shown in FIG. 21, the insolation estimating unit 12c corrects the insolation area data by overwriting the selected or generated insolation area data with the shadow area generated by the shield.

The shadow area generated on the display surface 20a of the display 20 by the shield can be calculated by optical simulation software, for example, based on the 3D data of the own vehicle and the position and size of the shield in the same manner as the sunlight area data. be. In addition, the shielding object detection processing based on the captured image may be performed by the in-vehicle camera 47 .

[Correction of insolation area]
The OLED display system of this embodiment executes the processing of the control flow shown in FIG. 22, for example.

The OLED display system of the present embodiment starts the control flow of FIG. 12 when a predetermined start condition is satisfied, such as when the vehicle-mounted camera 47 is turned on. The control flow of FIG. 12 is performed, for example, in parallel with the brightness control shown in FIG. 10, and is premised on the estimation of the insolation area in step S130.

In step S410, the in-vehicle camera 47 captures, for example, the space outside the vehicle V, and outputs the camera image to the control unit 12 as an image outside the vehicle.

Subsequently, the control unit 12 advances the process to step S420 to determine whether or not a shielding object has been detected by, for example, a known image analysis technique. In the case of , the process is returned to step S410.

Next, in step S430, the control unit 12 calculates a shadow area based on the shield detected in step S420.

In the subsequent step S440, the control unit 12 determines whether or not a shadow area is generated on the display surface 20a. If the determination is affirmative, the process proceeds to step S450. back to

In subsequent step S450, the control unit 12 overwrites the solar radiation area estimated in step S130 of FIG. 10 by adding the shade area calculated in step S430, for example, to correct the solar radiation area. After completing step S450, the control unit 12 returns the process to step S410.

The above is the correction processing of the insolation area by the OLED display system of the present embodiment.

According to the present embodiment, the OLED display system can obtain the same effects as those of the first embodiment. Moreover, according to this embodiment, the following effects are also obtained.

(1) In a situation where a shaded area occurs due to a shield, it is not necessary to increase the brightness of the pixel group located in the shaded area among the constituent pixels of the display 20, so it is possible to achieve both the visibility of the displayed image and the reduction of power consumption. is further improved compared to the first embodiment.

(Other embodiments)
Although the present disclosure has been described with reference to examples, it is understood that the present disclosure is not limited to such examples or structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and configurations, as well as other combinations and configurations including only one, more, or less elements thereof, are within the scope and spirit of this disclosure.

(1) For example, the OLED display system includes the sensor unit 30, the communication device 45, the illuminance acquisition unit 12d, and the illuminance estimation unit 12g. Alternatively, the configuration may be estimated. In this case, the OLED display system may be configured to switch between acquisition and estimation of illuminance as required, for example. In this way, the OLED display systems according to the above embodiments and modifications thereof may be freely combined within a possible range.

(2) In the first embodiment and its modification, the solar radiation estimator 12c acquires yaw information (vehicle angle φ ₃ ) of the inclination of the vehicle V from the vehicle ECU 44, and estimates the solar radiation area. has been described, but is not limited to this. For example, the OLED display system may be configured to acquire pitch and/or roll information in addition to yaw information of the own vehicle from the vehicle ECU 44, and estimate the solar radiation area based on these information. good. This also applies to the second and subsequent embodiments. As a result, the accuracy of estimating the insolation area by the insolation estimating unit 12c is further improved.

(3) the control unit 12 and techniques described in this disclosure are provided by configuring a processor and memory programmed to perform one or more functions embodied by a computer program; It may be implemented by a computer. Alternatively, the controller 12 and techniques described in this disclosure may be implemented by a dedicated computer provided by configuring the processor with one or more dedicated hardware logic circuits. Alternatively, the controller 12 and techniques described in this disclosure are a combination of a processor and memory programmed to perform one or more functions and a processor configured by one or more hardware logic circuits. may be implemented by one or more dedicated computers configured by The computer program may also be stored as computer-executable instructions on a computer-readable non-transitional tangible storage medium.

11... communication unit, 12... control unit, 12c1... position calculation unit,
12c2... direction estimation unit, 12c4... database unit, 12d... illuminance acquisition unit,
12e... brightness control section 12e... video output section 12f... illuminance estimation section,
20... display, 20a... display surface, 30... illuminance sensor,
46... Attitude sensor, 47... In-vehicle camera

Claims (9)

A display device for controlling image display in a display (20) having a plurality of pixels composed of self-luminous elements,
a position calculator (12c1) that calculates the position of the sun;
a direction estimator (12c2) for estimating the solar radiation direction with respect to the display based on the calculated position of the sun;
A surface of the display on which the image is displayed is defined as a display surface (20a), an area exposed to sunlight on the display surface is defined as a solar area, and the rest of the display surface is defined as a non-solar area, and a database unit (12c4) storing a data group consisting of a plurality of the solar radiation area data, with data indicating the distribution of the solar radiation area and the non-solar radiation area as the solar radiation area data;
a solar radiation estimation unit (12c) for estimating the solar radiation area based on the estimated solar radiation direction and the data group;
a brightness control unit (12e) that performs brightness adjustment to make the brightness of the solar radiation area higher than the brightness of the non-solar radiation area based on the estimation result of the solar radiation estimation unit;
A display device comprising: a video output section (12f) for outputting a video output signal for displaying the image whose brightness has been adjusted by the brightness control section in the display. further comprising an illuminance acquisition unit (12d) that acquires illuminance information of the environment from an illuminance sensor (30) that outputs an electrical signal corresponding to the illuminance of the environment in which the display is installed,
2. The display device according to claim 1, wherein said brightness control section adjusts brightness of said solar area based on said illuminance information. a communication unit (11) for acquiring weather information of the area where the display is installed;
an illuminance estimation unit (12g) for estimating the illuminance of the environment in which the display is installed based on the weather information acquired by the communication unit;
2. The display device according to claim 1, wherein said luminance control unit adjusts the luminance of said solar area based on the illuminance of said environment estimated by said illuminance estimating unit. A control unit (12) having the brightness control unit,
The control unit determines whether or not to perform the brightness adjustment based on the illuminance of the environment, and does not perform the brightness adjustment by the brightness control unit when it is determined not to perform the brightness adjustment. 4. The display device according to claim 2 or 3, which performs control. The angle of solar radiation incident on the display surface is defined as a panel incident angle, and the database unit stores the data group composed of the solar radiation area data for each panel incident angle,
The solar radiation estimating unit calculates the panel incident angle based on the estimated solar radiation direction, and selects one piece of the solar radiation area data closest to the calculated panel incident angle from the data group to estimate the solar radiation. 5. A display device according to any one of claims 1 to 4, wherein region estimation is performed. The angle of solar radiation incident on the display surface is defined as a panel incident angle, and the database unit stores the data group composed of the solar radiation area data for each panel incident angle,
The solar radiation estimator calculates the panel incident angle based on the estimated solar radiation direction, and calculates the first solar radiation area data closest to the calculated panel incident angle, and the first solar radiation area data next to the first solar radiation area data. selects the second solar radiation area data close to the panel incident angle calculated from the data group, and based on the two solar radiation area data, generates the solar radiation area data corresponding to the calculated panel incident angle. 5. The display device according to any one of claims 1 to 4, wherein the insolation area is estimated by doing. An in-vehicle display system comprising the display device according to any one of claims 1 to 6,
A portion of the solar radiation area data located on the boundary between the solar radiation area and the non-solar radiation area is defined as a feature point, and the feature point is associated with a component of a vehicle on which the display is mounted,
The solar radiation estimator acquires orientation information of the component from an orientation sensor (46) attached to the component, updates the feature points based on the orientation information, and corrects the estimated solar radiation area. In-vehicle display system. An in-vehicle display system comprising the display device according to any one of claims 1 to 6,
When a shield that blocks solar radiation to the vehicle is detected based on image data captured by an on-vehicle camera (47) attached to the vehicle on which the display is mounted, the solar radiation estimator detects the shield. An in-vehicle display system that calculates a shaded area generated on the display surface by a body and corrects the estimated insolation area based on the shaded area. An in-vehicle display system comprising the display device according to any one of claims 1 to 6,
The vehicle-mounted display system, wherein the direction estimating unit acquires pitch, roll, and yaw attitude information of the vehicle on which the display is mounted, and estimates the solar radiation direction based on the attitude information.

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