JP2011111123A - Display device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device for vehicle, capable of attaining reduction in cost and improvement in setting flexibility by reducing the number of part items while appropriately maintaining the brightness of a plurality of image to be projected at different places. <P>SOLUTION: The display device for vehicle which displays a first image on an HUD and a second image on a meter by a single indictor 18 includes: a luminance value adjustment means 32 which controls the luminance of a light source unit 23 based on the higher illuminance of a cabin-outside illuminance and a cabin-inside illuminance detected respectively by an external illuminometer 29 and an internal illuminometer 30; and a pixel value adjustment means 33 which performs, based on the lower illuminance of the cabin-outside illuminance and the cabin-inside illuminance detected by the external illuminometer 29 and the internal illuminometer 30, control to reduce the pixel value of one of the first image and the second image lower than the pixel value of the other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle display device that displays images on a plurality of display units.

  Conventionally, two displays are arranged in a case provided inside the instrument panel of a vehicle, an image generated by one display is projected onto a meter panel, and an image generated by the other display There is known a vehicle display device that projects the image onto the vehicle interior side of the front windshield (see, for example, Patent Document 1).

Japanese Utility Model Publication No. 5-72553

However, since the conventional vehicle display device described above includes a plurality of indicators, the number of components increases and the cost increases, and the size of the device increases due to the increase in the number of components. There is a problem that the degree of freedom of installation in an instrument panel is reduced.
In order to reduce the number of parts, for example, two images are generated by a single display, and these two images are reflected by a reflecting plate or the like and projected onto a meter panel and a front windshield, respectively. However, since a single display is used, for example, when the illuminance around the place where the image is projected is different, either one of the images has the appropriate brightness even if the brightness of the light source is adjusted. There is a risk that the merchantability will be reduced.

  The present invention has been made in view of the above circumstances, and reduces the number of parts by reducing the number of parts while improving the brightness of a plurality of images projected at different locations, and improving the degree of freedom of installation. It is an object of the present invention to provide a vehicle display device that can achieve the above.

  In order to solve the above-described problem, the invention described in claim 1 includes an image display unit (for example, the video display unit 22 in the embodiment) for displaying the first image and the second image, and the image display unit. A light source (for example, the light source unit 23 in the embodiment) that irradiates light to a display area of the first image and the second image (for example, the first video display unit 20 and the second video display unit 21 in the embodiment) is used as a vehicle. The first image is displayed on a video display unit (for example, the concave mirror 19 in the embodiment) provided in the instrument panel (for example, the instrument panel 13 in the embodiment). And generating a single image for displaying the second image on the video display unit (for example, the HUD display unit 5 in the embodiment) of the head-up display. In a vehicle display device including a stage (for example, the display 18 in the embodiment), illuminance detection means (for example, an illuminance meter 29 and an illuminance meter 30 in the embodiment) that detects the illuminance outside the vehicle compartment and the illuminance inside the vehicle interior. ) And light source luminance control means (for example, light source luminance control means in the embodiment) for controlling the luminance of the light source based on the higher illuminance among the illuminance outside the vehicle compartment and the illuminance inside the vehicle compartment detected by the illuminance detection means 32) and the pixel value of one of the first image and the second image based on the lower illuminance of the illuminance outside the vehicle compartment and the illuminance inside the vehicle compartment detected by the illuminance acquisition means. It is characterized by comprising pixel value control means (for example, pixel value control means 33 in the embodiment) that performs control for lowering the pixel value.

  According to a second aspect of the present invention, there is provided a luminance calculating means for calculating the display luminance of the second image and calculating the display luminance of the first image based on the illuminance in the vehicle interior (for example, in the embodiment). A luminance level calculation unit 26), and the pixel value control means displays the first image calculated by the luminance calculation means when the pixel value of the first image or the second image is reduced. According to the present invention, the brightness is lowered in accordance with a ratio between brightness and display brightness of the second image.

  According to a third aspect of the present invention, in the first or second aspect of the invention, the pixel value control means is configured such that the display brightness of the first image is lower than the display brightness of the second image. When the display value of the second image is lower than the display value of the first image while the pixel value of the first image is lower than the pixel value of the second image, the pixel value of the second image is set to the first value. It is characterized by being lower than the pixel value of one image.

  According to the first aspect of the present invention, the brightness of the light source is adjusted to the higher illuminance, that is, the brighter one of the illuminance outside the passenger compartment and the illuminance inside the passenger compartment. While adjusting the brightness of one of the second image to an appropriate brightness, the pixel value of the first image or the second image is reduced based on the lower illuminance between the illuminance outside the vehicle interior and the illuminance inside the vehicle interior Therefore, only the brightness of one of the first image and the second image can be reduced while irradiating the light of the light source having the same luminance. Therefore, each of the first image and the second image is appropriate while reducing the number of parts as compared with the case where the image generating means for displaying the first image and the image generating means for displaying the second image are individually provided. There is an effect that it is possible to display with brightness.

  According to the invention described in claim 2, according to the ratio between the display brightness of the second image calculated based on the illuminance outside the passenger compartment and the display brightness of the first image calculated based on the illuminance inside the passenger compartment, Since one pixel value of one image and the second image can be reduced, there is an effect that a more appropriate pixel value can be set.

  According to the invention described in claim 3, when the display brightness of the first image calculated based on the illuminance inside the vehicle interior is lower than the display brightness of the second image calculated based on the illuminance outside the vehicle interior, that is, When the vehicle interior is darker than the vehicle interior, the brightness of the first image displayed on the video display unit provided on the instrument panel that is affected by the illuminance in the vehicle interior can be reduced, When the outside of the passenger compartment is darker than the interior of the passenger compartment, the brightness of the second image displayed on the video display unit of the head-up display affected by the illuminance outside the passenger compartment can be reduced. Regardless, there is an effect that the first image and the second image can be individually displayed with appropriate brightness.

It is a sectional side view which shows schematic structure of the display apparatus for vehicles in embodiment of this invention. It is the figure which looked at the 1st image and 2nd image displayed on a HUD display part and a meter panel in the embodiment of the present invention from the driver's seat side. It is a schematic block diagram of the indicator in the embodiment of the present invention. FIG. 3 is a layout view of a first video display unit and a second video display unit of a transmissive liquid crystal panel in an embodiment of the present invention. It is a block diagram which shows the system configuration | structure of the display apparatus for vehicles in embodiment of this invention. It is a flowchart which shows the operation | movement of the brightness | luminance adjustment means in embodiment of this invention. It is a graph which shows the change of the display brightness level h, m, m 'in the modification of the embodiment of the present invention.

Next, a vehicle display device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration of a vehicle display device 1 according to this embodiment as viewed from the side. As shown in FIG. 1, an instrument panel 13 is disposed in front of a steering wheel 12 operated by an occupant seated in a driver's seat (not shown) of an automobile, and a front windshield is disposed above the instrument panel 13. 14 is inclined. An opening 13 a is formed in the instrument panel 13 on the front side of the steering wheel 12.

  A case 15 is accommodated in the instrument panel 13, and an opening 15 a is provided at a position corresponding to the opening 13 a of the instrument panel 13 of the case 15. In the case 15 below the openings 13a and 15a, a high-brightness reflective first screen 16 and a second screen 17 are installed. The first screen 16 and the second screen 17 are integrally formed, and the second screen 17 is disposed above the first screen 16. Since the first screen 16 and the second screen 17 are disposed below the openings 13a and 15a, the first screen 16 and the second screen 17 are not directly visible to the driver.

  A display 18 is arranged on the vehicle front side of the first screen 16 and the second screen 17 inside the case 15, and the display 18 has a projection port 18 a at the rear of the vehicle on the first screen 16 and the second screen 18. It arrange | positions so that the screen 17 may be opposed. The display 18 projects different first and second images on the first screen 16 and the second screen 17, respectively. For example, the first image projected on the first screen 16 is a speedometer or tachometer. On the other hand, the second image projected on the second screen 17 is an image including information such as a vehicle speed and various warnings that the driver needs to reliably recognize.

  The first image projected from the display 18 and diffused on the first screen 16 is reflected toward the openings 13a and 15a by the concave mirror 19 disposed above the display 18 and passes through the openings 15a and 13a. Reach the driver's eye point. That is, the first image projected on the first screen 16 is visually recognized by the driver as a virtual image that exists in front of the concave mirror 19. The display 18, the first screen 16 and the concave mirror 19 described above constitute a projection type meter panel.

  On the other hand, the second image projected on the second screen 17 is reflected toward the upper opening 15 b formed on the upper surface of the case 15. A pop-up type HUD display unit 5 that rises only at the time of use is supported at the front edge of the upper opening 15b so as to be openable and closable. The second image projected on the second screen 17 is reflected by the HUD display unit 5. Thus, it is visually recognized by the driver as a virtual image existing ahead of the HUD display unit 5. The display 18, the second screen 17, and the HUD display unit 5 described above constitute a so-called head-up display (hereinafter simply referred to as “HUD”) including a display unit above the instrument panel 13.

  FIG. 2 shows the virtual image of the first image that is reflected by the concave mirror 19 through the first screen 16 and the second image that is viewed by reflection at the HUD display unit 5 through the second screen 17. An example of a virtual image of an image is shown. The first image shown in FIG. 2 is composed of an image of a meter panel composed of various meters, and the second image is composed of an image obtained by digitally displaying the vehicle speed. Since the first image and the second image can be visually recognized as virtual images existing in front of the vehicle with respect to the HUD display unit 5 and the concave mirror 19, respectively, it is necessary to adjust the driver's focus when viewing the first and second images during driving. It is possible to reduce the burden.

  FIG. 3 shows a schematic configuration of a three-plate transmissive liquid crystal projector as an example of the display 18. The display 18 includes a light source 23 and an image display unit 22 (see FIG. 5). After the direction of the light output from the light source unit 23 is changed by the total reflection mirror 35, the dichroic mirrors 36, 37,. The light is wavelength-separated sequentially into rgb components through 38, and the light subjected to the wavelength separation is transmitted through transmissive liquid crystal panels 39, 40, 41 provided for each rgb constituting the video display unit 22. The light transmitted through these transmissive liquid crystal panels 39, 40, and 41 is synthesized by the prism 42 and then projected from the projection port 18 a through the projection lens 43.

  As shown in FIG. 4, the transmissive liquid crystal panels 39, 40, and 41 are configured such that the first video display unit 20 corresponding to the first screen 16 and the second video display unit 21 corresponding to the second screen 17 are vertically arranged. Are formed integrally with each other. Each of the first video display units 20 and the second video display units 21 of the transmissive liquid crystal panels 39, 40, and 41 is individually controlled by the display ECU 25.

  The light source unit 23 is a single light source such as a high-intensity lamp, and the brightness can be adjusted by the display ECU 25. The display 18 is not limited to a transmissive liquid crystal projector using a high-intensity lamp as a light source, and may be, for example, a reflective liquid crystal projector or a light source using an LED as a light source.

  As shown in FIG. 5, a display ECU (Electronic Control Unit) 25 that controls the display 18 includes a luminance level calculation unit 26, an original video generation unit 27, and a luminance adjustment unit 28. An illuminance meter 29 for detecting the illuminance outside the vehicle and an illuminance meter 30 for detecting the illuminance in the vehicle interior, more specifically, the illuminance in the vehicle interior behind the instrument panel 13 are connected to each other. Yes.

  The luminance level calculation unit 26 is based on the illuminance o detected by the vehicle illuminometer 29 and the illuminance i detected by the vehicle illuminometer 30, and the optimal display luminance level h for the HUD and the optimal display luminance for the meter panel. The level m is obtained by calculation, and the display luminance level h and the display luminance level m are output to the luminance adjustment unit 28. Illuminance o and illuminance i are relatively high in illuminance o and low in illuminance in the daytime backlight state, and low in illuminance o and high in illuminance i when indoor lighting is turned on at night. Become. If the backlight is in the daytime, the illuminance o is a very large value. The display luminance level h is relatively large corresponding to the illuminance o, and the room lighting is turned on at night. Since the illuminance i is a large value in a state such as being in a state of being in the display, the display luminance level m is a relatively large value corresponding to the illuminance i.

  The display luminance level h described above can be obtained by integrating a predetermined proportional constant set in advance with the illuminance o, and the display luminance level m is integrated with a predetermined proportional constant set in the illuminance i. You can ask for it. That is, the ratio of the display luminance levels h and m is equal to the ratio of the illuminances o and i, and h: m = o: i.

  The original image generation unit 27 is a transmissive liquid crystal panel 39, 40, 41 that constitutes the image display unit 22 of the display 18 based on information about the vehicle state input from various sensors such as a wheel speed sensor (not shown). Images to be displayed on the first video display unit 20 and the second video display unit 21 are respectively generated and output to the luminance adjustment unit 28.

  The luminance adjusting unit 28 controls the projection of the first image onto the first screen 16 and the projection of the second image onto the second screen by the display 18, and includes a light source luminance control means 32, pixel value control, and the like. Each means 33 is provided. The luminance adjustment unit 28 compares the display luminance level h and the display luminance level m input from the luminance level calculation unit 26 to determine the level. That is, the brightness adjustment unit 28 indirectly determines the level of the illuminance o and the illuminance i. Note that the illuminances o and i may be directly compared to determine the respective levels.

  The light source luminance control means 32 outputs to the light source unit 23 a luminance control signal for controlling lighting of the light source unit 23 at the display luminance level h or the display luminance level m corresponding to the higher illuminance among the illuminances o and i. Specifically, when the illuminance o (display luminance level h) is higher, the light source unit 23 is controlled to be turned on at the display luminance level h, and when it is determined that the illuminance i (display luminance level m) is high. Controls the lighting of the light source unit 23 at the display luminance level m.

  The pixel value control means 33 obtains the display pixel value rgb (x, y) of the original image that is optimal for the higher display luminance level of the display luminance level h and the display luminance level m. Here, “x” indicates the horizontal position of the pixel in the image, “y” indicates the same vertical position, and “rgb” indicates red (red) corresponding to the transmissive liquid crystal panels 39, 40, and 41, respectively. It means a combination of three colors of green and blue. In general, display pixel values are respectively set in the range of “0” to “255” for “r”, “g”, and “b”. For example, when the color of the pixel at the horizontal 10 and vertical 20 positions is yellow in the first image or the second image, rgb (10, 20) = (255, 255, 0), that is, the transmissive liquid crystal responsible for red The display pixel value of the horizontal 10 and vertical 20 of the panel 39 is “255”, the display pixel value of the horizontal and vertical 20 of the transmissive liquid crystal panel 40 responsible for green is “255”, and the transmissive liquid crystal panel 41 responsible for blue. The display pixel values of the horizontal 10 and vertical 20 are set to “0”.

  Further, the pixel value control means 33 is based on the lower display luminance level of the display luminance level h and the display luminance level m and the display pixel value rgb (x, y) of the original image. A display pixel value RGB (x, y) that is a display pixel value of two images is obtained. More specifically, when the display luminance level m is lower than the display luminance level h, the display pixel value of the first image is obtained by calculation, and when the display luminance level h is lower than the display luminance level m, the second value is obtained. The display pixel value of the image is obtained by calculation. Further, the display pixel value RGB (x, x, y) of the first image and the second image is obtained by using the obtained display pixel value, the display pixel value rgb (x, y) of the original image, and the ratio of the display luminance levels h, m. y) is obtained, and a video signal for performing display control of the first image and the second image with the display pixel value RGB (x, y) is output to the video display unit 22.

The vehicle display device 1 of this embodiment has the above-described configuration. Next, the operation of the vehicle display device 1 will be described with reference to the flowchart of FIG.
First, the display ECU 25 calculates the display luminance level h of the HUD and the display luminance level m of the meter panel based on the illuminance o and the illuminance i detected by the luminance level calculator 26 by the illuminance meter 29 and the illuminance meter 30 inside the vehicle. Then, it is determined whether or not the display brightness level h is higher than the display brightness level m so that the brightness adjustment unit 28 compares the display brightness level h and the display brightness level m to determine the level (step S01).

  If it is determined that the display luminance level h is higher than the display luminance level m (YES in step S02), the display luminance level h based on the illuminance o is set as the display luminance level L of the light source unit 23, and Of the display pixel values RGB (x, y) of the video display unit 22, the display pixel value rgb (x, y) set by the original video generation unit 27 is set as the display pixel value of the second image (for HUD). On the other hand, the display pixel value of the first image (for the meter panel) is obtained by dividing the lower display luminance level by the higher display luminance level, that is, m / h with respect to the display pixel value rgb (x, y). Is set (step S02). As a result, the display pixel value of the first image is lowered below the display pixel value of the second image in accordance with the ratio between the display luminance level h and the display luminance level m. Here, assuming that the display luminance level h, m is set to a value of 0 to 100% and the display luminance level h, m is (h, m) = (80,50), h> m. The display luminance level L of the light source unit 23 is 80%, and the display pixel value of the first image (for the meter panel) is 50/80 = 0.63 in rgb (x, y) set by the original video generation unit 27. Is a display pixel value obtained by integrating.

  When it is determined that the display luminance level h is equal to or lower than the display luminance level m, that is, when it is determined that the display luminance level m is high (NO in step S02), the display luminance value L of the light source unit 23 is set. The display luminance level m based on the illuminance i is set, and the original image generation unit 27 is used as the display pixel value of the first image (for meter panel) among the display pixel values RGB (x, y) of the image display unit 22. While the display pixel value rgb (x, y) set in step 1 is set, the pixel value of the second image is obtained by dividing the lower display luminance level by the higher display luminance level, that is, h / m. An integrated value is set for the pixel value rgb (x, y) (step S03). As a result, the display pixel value of the second image is lowered from the display pixel value of the first image in accordance with the ratio between the display luminance level h and the display luminance level m. Here, assuming that the display luminance levels h and m are values of 0 to 100% and the display luminance levels h and m are (h, m) = (30, 60), h <m. Therefore, the display luminance value L of the light source unit 23 is 60%, and the display pixel value of the second image (for HUD) is 30/60 = 0.5 in rgb (x, y) set by the original video generation unit 27. Is a display pixel value obtained by integrating.

As described above, when the display pixel value RGB (x, y) is set according to the level of the display luminance level h and the display luminance level m (step S02 and step S03), the display luminance is displayed on the display 18. The video signal of the original image with the level L and the display pixel value RGB (x, y) is output (step S04), and the above-described processing is repeated.
That is, the display pixel value of the first image projected on the first screen 16 and visible through the concave mirror 19 and the second image projected on the second screen 17 and visible via the HUD display unit 5 is The brightness of one image that remains rgb (x, y) is adjusted to an appropriate brightness by adjusting the luminance of the light source unit 23, and the brightness of the other image is adjusted to an appropriate value by reducing the display pixel value. The brightness will be adjusted.

  Therefore, according to the vehicle display device 1 of the first embodiment described above, the luminance of the light source unit 23 that irradiates the video display unit 22 is higher, that is, the higher one of the illuminance o outside the passenger compartment and the illuminance i inside the passenger compartment. By controlling based on the direction, while adjusting the brightness of one of the first image and the second image affected by the brighter illuminance to an appropriate brightness, the illuminance o outside the vehicle interior and the interior of the vehicle interior are adjusted. Since the display pixel value of the first image or the second image can be reduced based on the lower illuminance of the illuminance i, the first image and the first image are emitted while irradiating the light of the light source unit 23 having the same luminance. Only the brightness of one of the two images can be reduced. As a result, the display 18 for displaying the first image and the display 18 for displaying the second image are compared with the case where they are separately provided. The first image and the second image while reducing the number of parts It can be displayed in respectively appropriate brightness.

Further, the first image and the second image according to the ratio between the display luminance level h of the second image calculated based on the illuminance o outside the passenger compartment and the display luminance level m calculated based on the illuminance i inside the passenger compartment. Since one display pixel value can be reduced, a more appropriate display pixel value can be set.
Furthermore, when the illuminance i in the passenger compartment is lower than the illuminance o outside the passenger compartment, the display pixel value of the first image is reduced and the instrument panel 13 is affected by the illuminance i in the passenger compartment. When the brightness of the display image of the video display unit, that is, the first image displayed on the concave mirror 19 (meter panel) can be reduced, and the illuminance o outside the vehicle compartment is lower than the illuminance i inside the vehicle compartment If it is determined, the display pixel value of the second image can be reduced, and the brightness of the second image displayed on the HUD display unit 5 affected by the illuminance o outside the passenger compartment can be reduced. Both the first image and the second image can be displayed with appropriate brightness.

  In the above-described embodiment, the case where the display luminance levels h and m are obtained by calculation based on the illuminances o and i has been described. However, the calculation results of the display luminance levels h and m may be finely adjusted by manual input. Good. Moreover, although the case where the illuminances o and i are detected by the two illuminance meters of the vehicle illuminance meter 29 and the vehicle illuminance meter 30 has been described, the present invention is not limited to this configuration. For example, among the vehicle illuminance meter 29 and the vehicle illuminance meter 30 The illuminances o and i inside and outside the vehicle may be estimated from the lighting state of one illuminance meter or headlamp. Thereby, since the number of illuminance meters can be reduced, cost reduction can be aimed at.

  In the above-described embodiment, the first image and the second image projected from the display unit 18 are diffused on the first screen 16 and the second screen 17, and the first image is reflected by the concave mirror 19 to be the second image. However, the present invention is not limited to these configurations. For example, the display 18 is omitted, and the first screen 16 and the second screen 17 are replaced with the liquid crystal panel and the back. You may make it provide the liquid crystal display which consists of light. In this case, the liquid crystal panel of the liquid crystal display corresponds to the video display unit 22 described above, and the backlight corresponds to the light source unit 23. When this liquid crystal display is provided, the display area of one liquid crystal display is divided into a first area and a second area, and the first image is located in the first area located on the lower side, and the second area located on the upper side. The second image is displayed, and the display pixel value of each region may be individually controlled based on the illuminance i, m (or the display luminance level h, m), as in the video display unit 22 described above. The backlight may use various light sources, and the display luminance value is controlled based on the illuminance i, m (or the display luminance level h, m) as in the light source unit 23 described above.

Furthermore, the present invention is not limited to the configuration of the vehicle display device 1 of the above-described embodiment. In a typical vehicle driving environment, the display luminance of the meter panel (e.g., several tens of ~1000cd / ^{m 2)} HUD display brightness than (e.g., several tens to several thousands cd / ^{m 2)} is more, its The maximum display luminance that can take a large change range also increases. That is, when the illuminance i in the passenger compartment is low and the difference is very large compared to the illuminance o outside the passenger compartment, the display pixel value rgb (x, y) on the first screen needs to be significantly reduced. There is a possibility that the display quality may deteriorate. Therefore, as a modification of the above-described embodiment, for example, the luminance is reduced to 1 / K between the first screen 16 and the display 18, between the first screen 16 and the concave mirror 19, or at the eyepoint side of the concave mirror 19. You may insert and provide the neutral density filter to which it falls twice. With this configuration, the display pixel value rgb (x, y) of the first image can be maintained in a relatively high state, so that the contrast of the first image can be optimized. As a result, the display of the first image can be performed. It is possible to reduce the apparent brightness of the first image while preventing display quality from being deteriorated due to a significant decrease in the pixel value rgb (x, y).

  FIG. 7 is a graph in which the vertical axis represents display luminance levels h and m, and the horizontal axis represents illuminance o, and mainly shows changes in display luminance level h with respect to illuminance o. The curve of the display luminance level m in this graph shows an example of the optimum display luminance level for displaying the first image when the display luminance level h changes as shown in FIG. The display brightness level m ′ is set to the display pixel value rgb (x, y) to the extent that the display quality of the first image can be sufficiently secured when the light source unit 23 is controlled to be turned on at the display brightness level h. This is a reduced display luminance level. In other words, by reducing the display luminance level m ′ by reducing the display pixel value by 1 / K times with a neutral density filter, it is possible to suppress the decrease in the display pixel value, and to prevent the image quality from being deteriorated due to the decrease in the display pixel value. The first image reduced to a display brightness level m can reach the user's eye point.

  In the graph of FIG. 7, the area where the HUD image quality is given priority is that the luminance of the light source unit 23 is set according to the display luminance level h, and the display pixel value rgb (x, y) of the second image is not lowered. That is, an area where the image quality of the second image is prioritized, while an area where the image quality of the meter is prioritized is a display pixel of the first image in which the luminance of the light source unit 23 is set according to the display luminance level m. A region where the value rgb (x, y) is not lowered, that is, a region where the image quality of the first image is prioritized is shown.

5 HUD display part (video display part of head-up display)
13 Instrument panel 18 Display (image generation means)
19 Concave mirror (video display on the instrument panel)
20 First video display section (display area)
21 Second video display section (display area)
22 Video display unit (image display means)
23 Light source (light source)
29 Outside illuminance meter (illuminance detection means)
30 Car illuminance meter (illuminance detection means)
32 Light source luminance control means 33 Pixel value control means

Claims (3)

An image display means for displaying the first image and the second image, and a light source for irradiating light to the display area of the first image and the second image of the image display means are provided inside the instrument panel of the vehicle. A vehicle display device comprising a single image generating means for displaying the first image on a video display unit provided in the instrument panel and displaying the second image on a video display unit of a head-up display. In
Illuminance detection means for detecting the illuminance outside the passenger compartment and the illuminance inside the passenger compartment;
Light source luminance control means for controlling the luminance of the light source based on the higher illuminance among the illuminance outside the vehicle compartment and the illuminance inside the vehicle compartment detected by the illuminance detection means;
Based on the lower illuminance of the illuminance outside the vehicle interior and the illuminance inside the vehicle interior detected by the illuminance acquisition means, the pixel value of either the first image or the second image is set to be higher than the other pixel value. A display device for a vehicle, comprising: a pixel value control unit that performs a control to decrease. A luminance calculating means for calculating the display luminance of the second image based on the illuminance outside the passenger compartment acquired by the illuminance acquiring means, and calculating the display luminance of the first image based on the illuminance inside the passenger compartment;
When the pixel value control means lowers the pixel value of the first image or the second image, the display brightness of the first image calculated by the brightness calculation means and the display brightness of the second image are calculated. The vehicle display device according to claim 1, wherein the display device is reduced in accordance with a ratio of   The pixel value control means reduces the pixel value of the first image below the pixel value of the second image when the display luminance of the first image is lower than the display luminance of the second image. The pixel value of the second image is lowered below the pixel value of the first image when the display luminance of the second image is lower than the display luminance of the first image. The vehicle display device described.

Images