JP2012042761A - Video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the visibility of a user even if the partial irradiation of external light makes viewing environment change.SOLUTION: A video display device for displaying video on a display is configured to detect illuminance of the display, determine illuminance of each partial area on the display based on the detected illuminance, and decide, based on the determined illuminance of each partial area on the display, a partial area on which one or more video information pieces displayed on the display should be displayed.

Description

  The present invention relates to an image display device that displays an image on a display, and in particular, an image that can ensure visibility for a user even when the viewing environment changes due to partial external light irradiation. The present invention relates to a display device.

  Conventionally, when external light is radiated on the screen displaying images and images, the screen orientation is set so that the reflected light does not face the user in order to prevent the screen from becoming difficult to see due to the reflected light of the external light. A display device for changing the value is known.

  For example, Patent Document 1 calculates the incident angle and reflection angle of external light irradiated on the screen by various sensors and detects the positions of a plurality of users so that the reflected light does not face the user. Discloses a display device that rotates a screen portion.

  According to the display device of Patent Document 1, it is possible to avoid a situation in which the user feels dazzled by receiving reflected light and the entire screen is difficult to see.

JP 2009-69444 A

  The display device of Patent Document 1 is useful when a large screen is applied to a large number of users located relatively far from the screen. However, the display device of Patent Document 1 has a problem that it is difficult to eliminate all the difficulty of viewing for a small number of users located on the small screen and in the vicinity of the screen.

  Specifically, when a specific user uses the display device of Patent Document 1 in a narrow space, the screen portion may rotate in the opposite direction to the user depending on the incident angle of external light. Conceivable. In this case, if the rotation angle is large, the user is positioned in the vicinity of the screen, so that a situation in which the image on the screen cannot be seen at all occurs.

  Moreover, depending on the place where the display device of Patent Document 1 is installed, there is a case where there is little empty space behind the screen, and there is a problem that the screen portion cannot be rotated to an optimal angle that is not dazzling.

  For these reasons, it is a major issue how to realize a video display device that can ensure the visibility for the user even when the visual environment changes due to partial external light irradiation. It has become.

  The present invention was made to solve the above-described problems caused by the prior art, and ensures visibility for the user even when the visual environment changes due to partial external light irradiation. An object of the present invention is to provide a video display device capable of performing the above.

  In order to solve the above-described problems and achieve the object, the present invention is an image display device for displaying an image on a display, the illuminance detecting means for detecting the illuminance near the display, and the illuminance detecting means Display control means for determining a display position of the video to be displayed on the display based on the illuminance.

  Further, the present invention is an image display device for displaying an image on a display, the illuminance detecting means for detecting the illuminance of the display, and for each partial area of the display based on the illuminance detected by the illuminance detecting means. Illuminance determining means for determining the illuminance of the display, and one or more pieces of video information to be displayed on the display based on the illuminance for each partial area of the display determined by the illuminance determining means to any of the partial areas Video distribution means for deciding whether to display.

  According to the present invention, an image display device that displays an image on a display, detects illuminance near the display, and determines a display position of an image to be displayed on the display based on the detected illuminance. Even when the visual environment changes due to partial external light irradiation, it is possible to ensure visibility for the user.

  According to the present invention, there is provided a video display device for displaying video on a display, wherein the illuminance of the display is detected, the illuminance for each partial area of the display is determined based on the detected illuminance, and the determined display Since it is determined which one or a plurality of pieces of video information to be displayed on the display is to be displayed on the basis of the illuminance for each of the partial areas, there is a change in the viewing environment due to partial external light irradiation. Even if it occurs, there is an effect that visibility can be ensured for the user.

FIG. 1 is a diagram illustrating an overview of a video display method according to the present embodiment. FIG. 2 is a block diagram illustrating the configuration of the video display apparatus according to the present embodiment. FIG. 3 is a first diagram for explaining the visibility estimation processing in the visibility estimation unit. FIG. 4 is a second diagram for explaining the visibility estimation process in the visibility estimation unit. FIG. 5 is a diagram illustrating an example of the visibility information. FIG. 6 is a diagram illustrating an example of priority order information. FIG. 7 is a diagram for explaining video distribution processing in the video distribution unit. FIG. 8 is a diagram for explaining the reflectance. FIG. 9 is a flowchart showing an outline of a video distribution processing procedure executed by the video display device.

  Exemplary embodiments of a video display apparatus according to the present invention will be described below in detail with reference to the accompanying drawings. In the following, the outline of the video display method according to the present invention will be described with reference to FIG. 1, and then an embodiment of the video display apparatus according to the present invention will be described with reference to FIGS.

  First, an outline of a video display method according to the present invention will be described with reference to FIG. FIG. 1 is a diagram showing an outline of a video display method according to the present invention. 1A shows a video display method according to the prior art, and FIGS. 1B and 1C show a video display method according to the present invention.

  As shown in FIG. 1A, in the video display method according to the prior art, the incident angle and reflection angle of external light irradiated on the screen by various sensors are calculated, and the positions of a plurality of users are detected. Then, the orientation of the screen is rotated so that the reflected light does not face the user.

  However, in the video display method according to the prior art, when a specific user uses a display in a narrow space, the screen portion rotates in the opposite direction to the user depending on the incident angle of external light, There are also situations where the video on the screen is completely invisible.

  Therefore, in the video display method according to the present invention, a partial area with low visibility due to external light irradiation is estimated in the screen of the display, and an image with high priority is transferred to a partial area with high visibility. It was decided to sort them so that they were displayed.

  Specifically, as shown in FIG. 1B, a case where a video is displayed in each divided area divided into a plurality of screens in the video display device according to the present invention will be described. For example, a case will be described in which a video display device that uses a car navigation function (hereinafter referred to as “car navigation”) as one of the input sources displays two images, a map and a TV. In the case shown in FIG. 1, it is assumed that a map and a TV are set in advance from the highest priority of the video to be displayed.

  Here, in the video display method according to the present invention, the illuminance value is measured by a plurality of illuminometers arranged around the display. In the video display method according to the present invention, a display area with low visibility is estimated in a partial area (hereinafter referred to as “display area”) divided into a plurality of parts based on the measured illuminance value. To do.

  That is, in the video display method according to the present invention, as shown in FIG. 1B, when it is estimated that the left display area has low visibility, a video with high priority, here, a map video is visually recognized. Sort them so that they are displayed in a highly display area.

  As a result, as shown in FIG. 1C, the video display method according to the present invention displays the displayed map video and TV video so that the map video is displayed in the display area with high visibility on the right side. Swap the screen position.

  By doing in this way, in the video display method according to the present invention, it is possible to ensure visibility for the user even when the visual environment changes due to partial external light irradiation.

  In this embodiment, the case where the video display device is applied to a car navigation system mounted on a vehicle will be described. However, the present invention can also be applied to a video display device such as a personal computer display and a TV.

  Below, the Example about the image | video display method based on this invention demonstrated using FIG. 1 is described in detail. First, the configuration of the video display apparatus according to the present embodiment will be described with reference to FIG. FIG. 2 is a block diagram illustrating the configuration of the video display apparatus according to the present embodiment.

  Although only the components necessary for explaining the characteristic points of the video display device 10 are shown in the figure, a so-called GPS (Global Positioning System) function and a map display function provided in the car navigation device are described. It shall have.

  As shown in FIG. 2, the video display device 10 includes a sensor 11, an operation unit 12, a display 13, a communication I / F (interface) 14, a video source 15, a storage unit 16, and a control unit 17. The timer unit 18 is provided.

  The control unit 17 further includes an illuminance acquisition unit 17a, a visibility estimation unit 17b, a priority order changing unit 17c, a video distribution unit 17d, a video correction unit 17e, and a display processing unit 17f. The storage unit 16 stores threshold information 16a, visibility information 16b, and priority information 16c.

  The sensor 11 is a measuring device that detects the illuminance in the vicinity of the display 13, and measures the illuminance value by the plurality of sensors 11. The operation unit 12 receives an operation for changing the priority information 16c of the video. In addition, the operation unit 12 accepts a power ON / OFF operation, a selection operation of the video source 15 displayed on the display 13, a screen division instruction operation of the display 13, and the like.

  The display 13 is a display unit that displays the video source 15. In addition, it is not necessary to limit the component which performs the display and operation of the operation part 12 and the display 13. Therefore, a touch panel type liquid crystal display that accepts an input by pressing a finger or a pointing device and also serves as a display output may be used.

  Moreover, the windshield part in front of the driver may be configured to be translucent by a display such as HUD (Head-Up Display), or may be configured in the instrument part in front of the driver, or the room in front of the driver. You may comprise in a mirror part.

  The communication I / F 14 is connected to an antenna that transmits and receives radio waves and the like, and includes a communication device for performing radio communication. Light or radio waves are transmitted between the information providing apparatus or the GPS satellite and the video display apparatus 10. To send and receive data.

  Note that a plurality of information providing devices are installed on the road, and are equipped with radios such as DSRC (Dedicated Short Range Communication) and radio beacons. The information providing device is a device that provides traffic information and the like to the driver in real time by bidirectional communication with the video display device 10.

  The video source 15 is a video displayed on the display 13. For example, there are a camera image captured by a camera mounted on a vehicle, a TV image received via the communication I / F 14, and the like.

  The video source 15 also includes map video and navigation information (hereinafter referred to as “navigation information”) created based on the position information of the host vehicle, various traffic information, etc. received via the communication I / F 14. .

  The navigation information includes the required time to the destination, traffic jam information, and approach information of a moving object including a pedestrian. The video source 15 also includes an on-screen video that displays a warning or message by a pop-up screen.

  The storage unit 16 is a storage unit configured by a storage device such as a nonvolatile memory or a hard disk drive. This memory | storage part 16 memorize | stores the threshold value used when the visibility estimation part 17b estimates visibility as the threshold value information 16a.

  Further, the storage unit 16 stores information about the visibility estimated by the visibility estimation unit 17b as the visibility information 16b, and stores the priority of the video source 15 as the priority information 16c in advance. Details of the visibility information 16b and the priority information 16c will be described later.

  The control unit 17 is a control unit that performs overall control of the video display device 10. The illuminance acquisition unit 17a is a processing unit that performs processing to receive the illuminance value measured by the sensor 11 and pass it to the visibility estimation unit 17b.

  The visibility estimation unit 17b performs a process of estimating the illuminance value of a predetermined display area of the display 13 based on the illuminance value received from the illuminance acquisition unit 17a and the threshold information 16a, and estimating the visibility for each display area. It is a processing unit. The visibility estimating unit 17b also performs a process of storing the estimated visibility as the visibility information 16b. The details of the visibility estimation process will be described later.

  The priority changing unit 17c performs a process of changing the priority information 16c set for each video based on the change instruction when the user receives an instruction to change the priority information 16c from the operation unit 12. It is.

  The video distribution unit 17d is a processing unit that performs processing to distribute a high-priority video to a display area with high visibility based on the visibility information 16b and priority information 16c stored for each display area. It is. Details of the video distribution process will be described later.

  The video correction unit 17e determines whether or not there is an effect of correcting the video source 15 by the direct sunlight correction process, and corrects the video source 15 by the direct sunlight correction process when it is determined that there is an effect of correction. A processing unit that performs processing.

  Specifically, the video correcting unit 17e determines that there is an effect of correcting when the illuminance value for each display area estimated by the visibility estimating unit 17b does not exceed a predetermined threshold, and the video source 15 Is corrected by direct sunlight correction processing.

  In addition, when the illuminance value for each display area exceeds a predetermined threshold, the video correction unit 17e determines that the correction effect is small and does not correct the video source 15. The details of the direct sunlight correction process will be described later.

  The display processing unit 17f is a processing unit that performs processing to display the video source 15 distributed by the video distribution unit 17d and corrected by the video correction unit 17e on the display 13.

  The time measuring unit 18 includes a device for acquiring the current date and time. For example, the time measuring unit 18 acquires time information from a clock provided in the host vehicle, or time information included in data received together with position information of the host vehicle from a GPS satellite. get. In addition, the time measuring unit 18 passes the acquired time information to the visibility estimating unit 17b. Thereby, in the visibility estimation part 17b, the visibility for every display area is estimated based on the received time information and the installation place (an angle is included) of the display 13. FIG.

  Next, details of the visibility estimation process executed by the visibility estimation unit 17b will be described with reference to FIGS. FIG. 3 is a first diagram for explaining the visibility estimation processing in the visibility estimation unit 17b, and FIG. 4 is a second diagram for explaining the visibility estimation processing in the visibility estimation unit 17b.

  First, as shown in FIG. 3, the display 13 is divided into two screens, a display area 1 and a display area 2. The map image is displayed in the display area 1 and the TV image is displayed in the display area 2. Is displayed.

  In addition, two illuminance sensors, sensor A11 and sensor B11, are installed in the upper part of the display 13, and two illuminance sensors, sensor C11 and sensor D11, are installed in the lower part.

  Therefore, the visibility estimation unit 17b estimates the illuminance value at the top of the display area 1 from the illuminance value measured by the sensor A11, and estimates the illuminance value at the bottom of the display area 1 from the illuminance value measured by the sensor C11. It will be. Similarly, for the display area 2, the upper illuminance value is estimated by the sensor B11, and the lower illuminance value is estimated by the sensor D11.

  Here, as indicated by x, the illuminance value measured by the sensor A11 and the sensor C11 is larger than the threshold value of the threshold information 16a, and the illuminance value measured by the sensor B11 and the sensor D11 is the threshold value of the threshold information 16a. The case where it did not exceed will be described.

  The visibility estimating unit 17b estimates that the visibility is low when the number of sensors 11 (x marks) that measure the illuminance value that is larger than the threshold is equal to or larger than a predetermined number (here, two or more). To do. Therefore, the visibility estimation unit 17b estimates that the display area 1 has low visibility based on the result that there are two sensors 11 in the display area 1.

  Further, the visibility estimation unit 17b estimates that the display area 2 has high visibility based on the result that the display area 2 has zero sensors 11 (× marks) that measure the illuminance value that is larger than the threshold value.

  Next, a case where two images are displayed in display areas having different sizes on the display 13 will be described with reference to FIG. First, as shown in FIG. 2A, the screen is divided so that the horizontal width ratio between the display area 1 and the display area 2 is 1: 2, and the number of sensors 11 having the same ratio as the ratio is obtained. It is assumed that each display area is installed.

  Further, as indicated by a cross, the illuminance values measured by the sensors A11, B11, and D11 are larger than the threshold values of the threshold information 16a, and the illuminance values measured by the sensors C11, E11, and F11 are threshold values. A case where the threshold value of the information 16a is not exceeded will be described.

  Here, as in FIG. 3, the visibility estimation unit 17 b estimates that the visibility is low when the number of sensors 11 (× marks) that measure the illuminance value that is larger than the threshold value is two or more. . In this case, the visibility estimation unit 17b estimates that the display area 1 has low visibility based on the result that there are two sensors 11 (x marks) that measure the illuminance value larger than the threshold. To do.

  Further, the visibility estimation unit 17b estimates that the display area 2 has high visibility based on the result that the sensor 11 (x mark) that has measured the illuminance value that is larger than the threshold value is 1 in the display area 2. .

  Although the number of sensors 11 that measured an illuminance value that was larger than the threshold value in the display area was compared with the threshold value, the number of sensors 11 converted into the number per predetermined unit area and the threshold value were converted. It is good also as comparing with.

  Subsequently, as shown in FIG. 4B, two images are displayed on the display area with different sizes on the display 13, and two sensors 11 are installed on each display. Shall.

  Also in this case, similarly to the estimation method described above, the visibility estimation unit 17b estimates that the visibility is low when the number of sensors 11 that measure the illuminance value that is larger than the threshold value is equal to or greater than a predetermined number. Alternatively, the number of sensors 11 that have measured an illuminance value that is greater than the threshold value may be converted to a predetermined number per unit area, and visibility may be estimated based on the converted number.

  Next, details of the visibility information 16b and the priority information 16c will be described with reference to FIGS. FIG. 5 is a diagram illustrating an example of the visibility information 16b, and FIG. 6 is a diagram illustrating an example of the priority information 16c.

  First, as shown in FIG. 5, the visibility information 16b includes a “display area identifier” item, a “visibility” item, an “upper left coordinate value” item, and an “lower right coordinate value” item. . The “display area identifier” item is an identifier for identifying an area displayed on the display 13.

  The “visibility” item is the visibility estimated for each display area by the visibility estimation unit 17b. Here, it is exemplified that it is classified into high and low, but the visibility level may be subdivided and expressed by a numerical value or the like.

  The “upper left coordinate value” item is the upper left coordinate value (x, y) of the area displayed on the display 13 corresponding to the display area identifier, and the “lower right coordinate value” item is the lower right coordinate of the area. Value (x, y). It should be noted that, when the region is expressed, it is described by a coordinate value, but it may be expressed by various different methods other than the coordinate value.

  For example, as shown in FIG. 4, in the case where the two display areas are vertically divided so that the width ratio is 1: 2, it may be expressed using the width ratio. In this case, the display area “1” is expressed as “horizontal 1”, and the display area “2” is expressed as “horizontal 2”.

  Subsequently, as shown in FIG. 6, the priority order information 16 c includes a “video source type” item and a “priority order” item. The “video source type” item is a type of the video source 15 to which priority is given.

  The “priority order” item is a priority order set corresponding to the video source 15, and is assigned 1 and 2 in order from the highest. It is assumed that a high priority is set in advance for the video source 15 related to safety. For example, as shown in FIG. 6, the priority order of the on-screen video and the navigation video is set to 1 and 2.

  The setting can be added / changed from the operation unit 12 by a user or the like. For example, when a DVD is connected to the video display device 10, “DVD: 5” may be added to the priority order information 16c. Note that the control unit 17 can lock the video source 15 related to safety so that the user cannot change the setting.

  Based on the visibility information 16b and the priority information 16c described above, the video sorting unit 17d sorts the video with high priority so as to be displayed in the display area with high visibility.

  Next, details of the video distribution process executed by the video distribution unit 17d will be described with reference to FIG. FIG. 7 is a diagram for explaining video distribution processing in the video distribution unit 17d. 7A, 7 </ b> B, and 7 </ b> C illustrate a case where the display area that is estimated to have low visibility by the visibility estimation unit 17 b is on the left side of the screen, and FIG. ) Describes a case where a display area with low visibility is at the top of the screen.

  First, as shown in FIG. 7A, when only one map image is displayed at the center of the screen, the image distribution unit 17d distributes the image source 15 so that it is shifted to the right and displayed. .

  Also, as shown in FIG. 7B, when only one map image is displayed on the entire screen, the image distribution unit 17d displays the image source 15 on the right side by reducing the width only. Sort out.

  Next, a case where a map video is displayed in a display area estimated to have low visibility and an on-screen video is displayed on the map video will be described. In the priority information 16c, the highest priority is set for the on-screen.

  In this case, as shown in FIG. 7C, the video distribution unit 17d distributes the on-screen video to the right of the screen, which is a display area with high visibility. Also, as shown in FIG. 7D, when the display area with high visibility is the lower part of the screen, the video distribution unit 17d expands the horizontal width of the display size of the on-screen video to increase the on-screen video. Sort to display. Thus, the position, size and shape of the on-screen video are optimally changed by the video distribution unit 17d based on the illuminance value and visibility.

  When the screen is divided and a plurality of videos are displayed, the video sorting unit 17d displays a video with a high priority on the display area with the highest visibility based on the illuminance value for each display area. Thus, the video source 15 is switched and distributed.

  For example, the video distribution unit 17d may determine that the area with the lowest total illuminance value in the display area is the display area with the highest visibility. Alternatively, the illuminance value in the display area may be converted per predetermined unit area, and the area with the lowest converted value may be determined as the display area with the highest visibility.

  Next, details of the correction processing executed by the video correction unit 17e will be described. Here, in order to explain the correction effect when the video correction unit 17e corrects the video source 15, the reflectance will be described with reference to FIG. FIG. 8 is a diagram for explaining the reflectance. Note that (A) in the figure shows a diagram for explaining the reflectance calculation, and (B) in the figure shows the calculation result of the reflectance.

  As shown in FIG. 8 (A), the surface of the display 13 was irradiated with light from a point light source at an incident angle of 30 °, and the brightness at each position on the surface of the display 13 was measured by a camera for measuring the brightness. An experiment was conducted to calculate the reflectance based on the luminance.

  Here, from the point light source, light equivalent to the illuminance (about 150,000 lux) of direct sunlight in midsummer was irradiated. Further, the reflectance is a value obtained by dividing the luminance by (illuminance / π), and is represented by Expression (1).

  Reflectance (%) = Measured luminance / (Illuminance / π) × 100 (1)

  As a result, the calculated reflectance (%) is represented by a graph 20 as shown in FIG. The X axis in the figure indicates the position of the display 13 and the Y axis indicates the reflectance (%).

  The reflectance from the position a to the position b of the display 13 is 2% or less, but from the position b to the position c, the reflectance exceeds 2%. Even when the incident angle of the point light source is changed from 8 ° to 52 °, substantially the same result is obtained.

  Here, when the video source 15 is corrected by direct sunlight correction processing, if the reflectance exceeds 2%, a sufficient correction effect cannot be obtained. Therefore, the video correction unit 17e determines whether or not to correct the video source 15 based on luminance and illuminance that are assumed to have a reflectance exceeding 2%.

  Specifically, the video correction unit 17e determines that there is an effect of correcting when the illuminance value for each display area estimated by the illuminance acquisition unit 17a does not exceed a predetermined threshold, and corrects the video source 15 to direct sunlight. Correct by processing.

  By the way, the decrease in visibility causes the external light such as very strong direct sunlight to be reflected on the surface of the display 13, and a part of the maximum gradation expression width (hereinafter referred to as “dynamic range”) is lost. This is due to the fact that

  Since the gradation of the RGB pixels is assigned to the normal dynamic range, a part of the gradation is lost with the partial loss of the dynamic range. That is, the visibility is lowered due to the occurrence of gradation that cannot be expressed.

  Therefore, in the direct sunlight correction process performed by the video correction unit 17e, gradations that can no longer be expressed by gradation control of RGB pixels are restored. Further, the video correction unit 17e projects and assigns gradations before irradiation, and restores gradations that can no longer be expressed. Specifically, the dynamic range is expanded to an extent corresponding to the dynamic range before irradiation by increasing the light amount of the backlight light source.

  Further, the video correction unit 17e smoothes the difference in luminance that occurs between the display area with low visibility and the adjacent display area using a predetermined parameter, so that the boundary of the area is displayed when the video is displayed. It was decided not to stand out.

  Further, the video correction unit 17e controls the flickering of the screen that occurs when the video is displayed by smoothing the luminance difference in time series using a predetermined parameter. In this way, the video correction unit 17e performs direct sunlight correction processing of the video source 15. However, in addition to the above correction examples, the video correction unit 17e may be implemented by various different correction methods.

  Next, details of the video distribution processing executed by the video display device 10 according to the present embodiment will be described with reference to FIG. FIG. 9 is a flowchart showing an outline of a video distribution processing procedure executed by the video display device 10.

  As shown in FIG. 9, the illuminance acquisition unit 17a acquires the illuminance near the display 13 measured by the plurality of sensors 11 provided in the video display device 10 (step S101).

  Then, the visibility estimating unit 17b estimates an illuminance value for each display area based on the illuminance value acquired by the illuminance acquiring unit 17a (step S102), and based on the estimated illuminance value of the display area, Visibility is estimated (step S103).

  Subsequently, the video distribution unit 17d acquires the priority information 16c (step S104), and the video source 15 displayed on the display 13 is replaced based on the acquired priority information 16c and the visibility information 16b. It is determined whether or not it is necessary (step S105).

  When it is determined that the video source 15 needs to be replaced (Yes in step S105), the video distribution unit 17d determines whether the video source 15 needs to be corrected. (Step S106).

  When it is determined that the video source 15 needs to be corrected (Yes in step S106), the video correction unit 17e performs a correction process on the video source 15 (step S107). On the other hand, if it is determined that the correction of the video source 15 is not necessary (No at Step S106), the video correction unit 17e shifts the process to Step S108.

  Then, the display processing unit 17f displays the video source 15 distributed by the video distribution unit 17d on the display 13 (step S108), and ends a series of video distribution processing executed by the video display device 10.

  On the other hand, when it is determined in step S105 that the replacement of the video source 15 is unnecessary (No in step S105), the video distribution unit 17d ends the video distribution process. Note that the video display device 10 repeats the video distribution processing in steps S101 to S108 described above at predetermined time intervals.

  In this way, the video display device 10 that displays video on the display 13 detects the illuminance in the vicinity of the display 13, estimates the illuminance and visibility for each partial region of the display 13 based on the detected illuminance, and estimates Since the video display device 10 is configured to distribute to which partial area the video source, which is one or a plurality of video information to be displayed on the display 13, is displayed based on the visibility, Even if the visual environment changes due to the irradiation, the visibility can be secured for the user.

  In the above-described embodiment, an example in which the video display device is applied to a car navigation system mounted on a vehicle has been described. However, the present invention can be similarly applied to a video display device such as a personal computer display and a TV.

  In the above-described embodiment, one screen is divided into a plurality of display areas and distributed. However, the present invention can be similarly applied to a case where a screen is used for a personal computer to which a plurality of displays are connected.

  For example, when it is estimated that there is a display with low visibility among a plurality of displays, it may be distributed so that an image with high priority is displayed on a display with high visibility.

  In the above-described embodiment, the visibility for each display area is estimated based on the illuminance values measured by the plurality of sensors 11. However, it is good also as estimating the visibility for every display area based on the time information acquired by the time measuring part 18, and the installation place (an angle is included) of the display 13. FIG. In addition, when the video display device 10 is applied to a car navigation system mounted on a vehicle, the visibility may be estimated based on the traveling direction of the vehicle, the position of the driver, and the like.

  Specifically, the video display device estimates the amount and angle of solar irradiation based on the date and time included in the time information acquired by the time measuring unit 18, and real-time based on the installation location of the display 13 and the traveling direction of the car. Then, the orientation of the display 13 is calculated. The video display apparatus estimates the visibility for each display area based on the irradiation amount, the irradiation angle, and the orientation of the display 13.

  As described above, the video display device according to the present invention is useful for preventing the screen from becoming difficult to see due to reflected light of outside light, and in particular, changes in the viewing environment due to partial external light irradiation. Even if it occurs, it is suitable for ensuring visibility for the user.

DESCRIPTION OF SYMBOLS 10 Image display apparatus 11 Sensor 12 Operation part 13 Display 14 Communication I / F
DESCRIPTION OF SYMBOLS 15 Image | video source 16 Memory | storage part 16a Threshold information 16b Visibility information 16c Priority information 17 Control part 17a Illuminance acquisition part 17b Visibility estimation part 17c Priority change part 17d Video distribution part 17e Video correction part 17f Display processing part 18 Timing part

Claims (8)

A video display device for displaying video on a display,
Illuminance detection means for detecting illuminance in the vicinity of the display;
An image display device comprising: display control means for determining a display position of the image to be displayed on the display based on the illuminance detected by the illuminance detection means. A video display device for displaying video on a display,
Illuminance detection means for detecting the illuminance of the display;
Illuminance determination means for determining the illuminance for each partial area of the display based on the illuminance detected by the illuminance detection means;
Video distribution means for determining in which partial area one or more pieces of video information to be displayed on the display are to be displayed based on the illuminance for each partial area of the display determined by the illuminance determination means; A video display device comprising: Priority storage means for storing a priority in advance for the video source to be displayed on the display;
Visibility estimating means for estimating the visibility of each partial area of the display based on the illuminance determined by the illuminance determining means, and
The video distribution means includes
2. The display device according to claim 1, wherein the video source stored in the priority storage unit is sorted so as to be displayed on the partial area with high visibility estimated by the visibility estimation unit in preference to the video source with high priority. Item 3. The video display device according to Item 2. The visibility estimating means includes
The video display according to claim 2 or 3, wherein the visibility is estimated based on a number of the illuminance detected by the illuminance detection means associated with the partial area exceeding a predetermined threshold. apparatus. The visibility estimating means includes
5. The video display device according to claim 2, wherein the visibility is estimated based on a total value of the illuminances detected by the illuminance detection means associated with the partial area. The video display device according to claim 2, further comprising: a video correction unit that corrects the video source distributed by the video distribution unit. The priority storage means includes
The video display device according to claim 3, wherein the priority can be changed. The video display device according to claim 1, wherein a plurality of the illuminance detection units are provided.

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