JP2018144555A - Display for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make visibility improve even if there is a brightness irregularity on a display panel mainly.SOLUTION: As for a display for vehicle 1, a light source 3 for transmitted illumination of a display panel 2 is arranged in the back side of the display panel 2. In a light source near section 11 of the display panel 2, display 12 uses colors of low relative luminosity. In a section 13 except the light source near section 11 of the display panel 2, display 14 uses colors of high relative luminosity. It is preferable that the display of the display panel 2 is reflected to a reflection part 23 provided forward in a compartment 22 in a head up display device 21.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle display device.

  Vehicles such as automobiles are provided with various display devices (vehicle display devices) in the passenger compartment (see, for example, Patent Document 1).

  Some display devices are provided with a light source for transmitting and illuminating the display panel on the back side of the display panel.

JP 2012-58690 A

  In the above-described display device, in order to improve visibility, the display panel is designed to eliminate luminance unevenness. However, it is technically difficult to completely eliminate the display panel luminance unevenness.

  Accordingly, the main object of the present invention is to solve the above-described problems.

In order to solve the above problems, the present invention provides:
In the display device for a vehicle in which a light source for transmitting and illuminating the display panel is disposed on the back side of the display panel,
In the vicinity of the light source of the display panel, display with a color with low specific visibility,
The display panel is configured to perform display with a color having a high relative visibility at a portion other than the vicinity of the light source.

  According to the present invention, the above configuration can improve the visibility even when the display panel has uneven luminance.

It is a longitudinal cross-sectional view of the display apparatus for vehicles concerning this Embodiment. It is a top view of FIG. 1 which shows the display of a display panel. It is a graph which shows specific visual sensitivity. It is a schematic side view which shows the structure of a head-up display apparatus.

Hereinafter, the present embodiment will be described in detail with reference to the drawings.
1 to 4 are for explaining this embodiment.

  <Configuration> The configuration of this embodiment will be described below.

  In a vehicle such as an automobile, a display device (vehicle display device) is provided in the passenger compartment.

  As shown in FIG. 1, the display device 1 includes a light source 3 that transmits and illuminates the display panel 2 on the back side of the display panel 2.

  Here, the display panel 2 is a liquid crystal panel or the like. The light source 3 serves as a backlight for the display panel 2. As the light source 3, an LED can be used. The light source 3 is attached to the circuit board 5. A reflective member such as a reflector 6 that guides light from the light source 3 toward the display panel 2 is provided between the display panel 2 and the light source 3. For the reflector 6, it is preferable to use a resin having a high light reflectance, or to apply a specular reflection film 7 to at least a surface that reflects light. A diffusion plate 8 for diffusing light may be provided on the back side of the display panel 2.

  In this embodiment, two light sources 3 are provided, and the reflector 6 has two cylindrical spaces that guide light from the two light sources 3 to the back side of the display panel 2 respectively. The interior of the reflector 6 is divided into two cylindrical spaces surrounding the light sources 3 by a partition 6a. Each cylindrical space of the reflector 6 extends toward the display panel 2. However, the reflector 6 may have no partition 6a inside.

  In contrast to the basic configuration as described above, this embodiment has the following configuration.

(1) As shown in FIG. 2, the light source vicinity portion 11 of the display panel 2 is configured to perform display 12 with a color having low relative visibility.
Further, the portion 13 other than the light source vicinity portion 11 is configured to perform display 14 with a color having high specific visibility.

  Here, the light source vicinity portion 11 is a position on the display panel 2 facing the light source 3 and its peripheral portion. Or it is a part where the luminance is the same as or higher than the average luminance of the display panel 2. The light source vicinity portion 11 is, for example, the center portion of the display panel 2 or the like.

  As shown in FIG. 3, the specific visibility is an index indicating the sensitivity of the eye according to the wavelength of light. The brightness of the light having a wavelength of 555 nm that the eye feels brightest is 1, and the other has the same energy as this. This is a relative value of the brightness of light having a wavelength of.

  A color having a low specific visibility is a color having a specific visibility of about 0.4 or less, such as red, blue, or blue-violet.

  A portion 13 other than the light source vicinity portion 11 is a portion of the display panel 2 that is away from the light source 3. Or it is a part where the luminance is the same as or lower than the average luminance of the display panel 2. The portion 13 other than the light source vicinity portion 11 is, for example, a peripheral portion of the display panel 2 or the like.

  A color having a high specific visibility is a color having a specific visibility of about 0.4 or more, such as yellowish green, green, yellow, and white.

  Specifically, in the display panel 2 of FIG. 2, a display 12 that indicates a traveling direction, a warning, and the like in a color with low relative visibility with respect to the two high-luminance positions in the center directly above the light source 3. Like to do. In addition, a display 14 such as a distance to the destination and a vehicle speed is displayed with a color having a high relative visibility at a low luminance position on the lower side of the display panel 2 that is out of the light source 3. In addition, in order to guide the light from the light source 3 to the lower side of the display panel 2, the reflector 6 may cut out a part of the partition part 6a described above or eliminate the partition part 6a.

  (2) In such a display device 1, as shown in FIG. 4, the display on the display panel 2 is projected on the reflection portion 23 installed in the front of the passenger compartment 22 in the head-up display device 21. Is preferable.

  Here, the head-up display device 21 includes a display device 1 that can display information for assisting driving, and a reflection unit 23 that can display the image 24 of the display device 1 as a virtual image 26 in front of the driver seat 25. ing.

  The information that supports driving can be general information (normal display) such as speed information and route information. The reflector 23 can be a dedicated reflector (combiner), a front window 27, or the like. The front window 27 can reflect the image 24 of the display device 1 by using glass having a wedge-shaped cross section or by providing a reflective film.

  In this embodiment, the head-up display device 21 is attached to a portion of an instrument panel 32 provided on the vehicle 31. That is, the image 24 of the display device 1 installed inside the instrument panel 32 is reflected by the reflecting portion 23 (combiner) attached to the periphery of the opening 33 provided in the instrument panel 32 (in a fixed state or openable). It is supposed to be. The head-up display device 21 displays the virtual image 26 at a position on the back side of the reflection unit 23. The virtual image 26 is displayed so as to be superimposed on an external scenery visible through the front window 27 or arranged side by side on the external scenery.

  A reflection mirror that guides the display of the display device 1 to the reflection unit 23 or a display while the display device 1 is enlarged is reflected at a position between the display device 1 and the reflection unit 23 inside the instrument panel 32. One or more optical components 34 such as a magnifying glass leading to the unit 23 may be installed. The specific configuration of the head-up display device 21 is not limited to the above.

  <Effect> According to this embodiment, the following effects can be obtained.

  (Effect 1) As shown in FIG. 2, the display device 1 is configured to illuminate the display panel 2 by turning on the light source 3 disposed on the back side of the display panel 2.

  At this time, in the vicinity 11 of the light source of the display panel 2, display 12 with a color with low specific visibility is performed. Thereby, it is possible to make the brightness of the light source vicinity portion 11 where the luminance is high on the display panel 2 feel low (dark).

  Further, in the portion 13 other than the light source vicinity portion 11 of the display panel 2, display 14 with a color having a high relative visibility is performed. Accordingly, it is possible to make the brightness of the portion 13 other than the light source vicinity portion 11 where the luminance is low on the display panel 2 feel higher (brighter).

  As a result, even if the brightness of the display panel 2 is not uniform and the display panel 2 has some brightness unevenness, the brightness of the display panel 2 is generally uniform. Can be felt. Therefore, the visibility of the display panel 2 can be improved.

  As a result, it is not necessary to completely eliminate the luminance unevenness of the display panel 2, and accordingly, the development man-hour can be reduced and the development period can be shortened. That is, until now, for example, an excessive luminance is obtained by using a large number of light sources 3 (LEDs), and then the luminance is partially reduced to achieve uniform luminance as a whole. On the other hand, in the case of this embodiment, even if the number of light sources 3 (LEDs) is reduced and brightness unevenness is likely to occur, the brightness is easily shown to be uniform. Will be able to.

  Therefore, for example, it is necessary to provide an optical component 34 such as a Fresnel lens, a microlens array, a light guide, and a diffusion plate 8 for uniform brightness, or to optimally design these optical components 34. Therefore, the optical component 34 itself can be reduced, and the trouble of optimizing the optical component 34 can be eliminated. Accordingly, it is possible to reduce development costs and parts costs.

  (Operation Effect 2) The vehicle head-up display device 21 displays information for assisting driving as a virtual image 26 in front of the driver's seat 25, and the display content of the display panel 2 is limited. Even if there is some brightness unevenness on the panel 2, the apparent brightness is reduced by using a color with low relative visibility in the high brightness area and using a color with high relative visibility in the low brightness area. Uniformity can be easily achieved. Therefore, the display device 1 of this embodiment can be suitably used for the head-up display device 21.

DESCRIPTION OF SYMBOLS 1 Display apparatus 2 Display panel 3 Light source 11 Light source vicinity part 12 Display by color with low relative visibility 13 Parts other than light source vicinity part 14 Display by color with high relative sensitivity 21 Head-up display device 22 Car interior 23 Reflection part

Claims (2)

In the display device for a vehicle in which a light source for transmitting and illuminating the display panel is disposed on the back side of the display panel,
In the vicinity of the light source of the display panel, display with a color with low specific visibility,
A display apparatus for a vehicle, characterized in that a display with a color having a high relative visibility is performed in a portion other than the vicinity of the light source of the display panel. The vehicle display device according to claim 1,
The display device for a vehicle, wherein the display on the display panel is projected on a reflection section installed in front of the passenger compartment in the head-up display device.