JPS61238014A - Display device for vehicle - Google Patents

Abstract

PURPOSE:To shorten the depth of a display part by arranging display panels of a heat-up type and a head-down type display part, back to back, closely and almost coaxially, and arranging one light source between both display panels and using it for both display parts in common. CONSTITUTION:A figure shows an example of a heat-up and head-down type display device for a vehicle. Light from an illumination light source 20 is converged in both directions by a light reflector 21 and diffused by light diffusing plates 17 and 19 respectively to enter transmission type liquid crystal panels 16 and 18, so that they are used as illumination light for liquid crystal display. Consequently, drive information displayed on the liquid crystal panel 16 is magnified by a magnifying lens 22, reflected by a total reflection mirror 23 to travels toward a windshield (not shown in figure), and reflected by the windshield, so that its virtual image is seen outside in front of the windshield. Driver information displayed on the liquid crystal panel 18, on the other hand, is seen through an acryl curved surface plate 24. consequently, the illumination light from the one illumination light source is distributed to right and left; one is used as the light source of the head-up display part and the other is used as the light source of a head-down display part, thereby reducing the depth.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a display device for a vehicle in which the structure of a driving information display section is interconnected to facilitate layout.

(Conventional technology) A special translation of F, I! FJE 1FI-
In the past, driving information such as the time was displayed using meters and clocks installed on the instrument panel, but recently drivers do not have to take their eyes off the front view to view this information. A display device has been devised in which the driving information is imaged in the front field of view outside the windshield so that it can be seen so as to overlap with the foreground in the field of view (for example, Japanese Patent Application Laid-Open No. 182541/1982). It is called a head-up display device.

By the way, vehicle driving information includes information that the driver wants to see all the time while driving, such as vehicle speed and following distance, and information that he wants to see occasionally, such as remaining fuel level and mileage.The former is displayed within the driver's forward field of vision. Although it is convenient (head amplifier type),
Since it is cumbersome to always display the latter in the front field of view, it is convenient to display it in the position of conventional meters on the instrument panel (head-down type).

Figure 3 is an example of a display device in which driving information is displayed in two locations: 1 is the windshield, 2 is the instrument pad, and 3 is the steering wheel. The desired driving information A is displayed within the front field of view of the windshield 1, and the driving information B, which is sometimes desired such as remaining fuel level, is displayed on the front of the instrument pad 2.

FIG. 4 is a sectional view taken along the line A-A in FIG. 3, and the head-up display section includes a fluorescent display tube 5 as a driving information display inside the case 4, a color filter 6, a magnifying lens 7, The head-down type display section is composed of a total reflection mirror 8 arranged in sequence, and a head-down type display unit includes a reflection curved mirror 10, an illumination light source 11, a diffuser plate 12, and a fluorescent display tube as an operating information display inside a case 9. 13 and a filter 14 are arranged in sequence, and the tip 9a of the case 9 is a shade made of transparent acrylic.

In this type of head-up/head-down display device,
Recently, there has been a trend toward using transmissive display type liquid crystal panels in order to improve the appearance and visibility of displays. When such a transmissive liquid crystal panel is used, the thickness in the optical axis direction including the illumination part is about 50 mm, which increases the depth and reduces the degree of freedom in repair design and shaping.

(Objective and Structure of the Invention) The present invention has been made in view of the above points, and an object thereof is to make the head-up/head-down type display section using two transmissive display panels compact and to facilitate the layout. In order to achieve this purpose, the display panels of the head-up type display section and the head-down type display section are arranged close to each other back to back, almost coaxially, and one light source is arranged between both display panels. This is shared by both display sections.

(Example) The present invention will be explained below based on the drawings.

FIG. 1 shows an embodiment of a head-up/head-down type display device which is a vehicle display device according to the present invention.
15 is the case, 16 is the operating information for the head amplifier display (
17 is a light diffusion plate; 18 is a transmission liquid crystal panel that displays driving information (for example, remaining fuel level) for head-down display; 19 is a light diffusion plate; 20 is a light diffusion plate; This is the illumination light source for the transmissive liquid crystal panels 16 and 18, and a white light source such as a cold cathode discharge tube is used. 21 is a light reflector made by bending a thin aluminum plate, 22
2 is a magnifying lens that forms part of the head amplifier display section;
3 is a total reflection mirror, 24 is a transparent acrylic curved plate cover for head-down display, and the instrument side portion of the case 15 forms a shade 15a. As shown in the figure, the head-up display section and the head-down display section are arranged coaxially so that the optical axes of their driving information display lights substantially coincide with each other.

Light from the illumination light source 20 is focused in both directions by the light reflector 21, diffused by the light diffusion plates 17 and 19, and enters the transmissive liquid crystal panels 16 and 18 to become illumination light for liquid crystal display. As a result, the driving information displayed on the liquid crystal panel 16 is magnified by the magnifying lens 22, reflected by the total reflection mirror 23, and directed towards the windshield (not shown). Al m+1 Life-1= +w w 41 Shi J-v
*! The operating information shown is visible through the acrylic curved plate 24.

By configuring the head-up/head-down display section in this way, the illumination light from one illumination light source is divided into left and right sides, and one side is used as a light source for the head-up display section, and the other is used as a light source for the head-down display section. Therefore, the depth of the display section is significantly reduced compared to conventional configurations.

In the display device with the above configuration, by adjusting the brightness of the illumination light source 20 according to the brightness around the vehicle, the brightness of the head-up display and the brightness of the head-down display can be changed at the same time. Even when the driving information and the head-down display are viewed alternately, there is no unnatural difference in the brightness of the display, making it easy to see. It is preferable that the light diffusing plate 17 has a higher transmittance.

FIG. 2 shows another embodiment of the vehicle display device according to the present invention. In this embodiment, the illumination light source section is made into a unit and is replaceable, and shows a point and a light source using three illumination light sources 20. Since the parts other than the parts are completely the same as the embodiment shown in FIG. 1, the same reference numerals will be given and the explanation will be omitted. The light source section has an illumination light source 20 and a light reflector 21 sandwiched between upper and lower clamp sections 25, and a hook section 26 is provided on the upper clamp section 25 to facilitate replacement.

(Effects of the Invention) As explained above, in the present invention, the display panels of the head-up type display section and the head-down type display section are arranged close to each other back to back and almost coaxially, and between the two display panels. Since one light source is arranged and shared by both display sections, the depth of the display section can be shortened, increasing the degree of design freedom in terms of decoration and shaping. Because they share the same brightness, the brightness of the head-up display image and the head-down display image can be controlled equally easily, and there is no eye fatigue due to unnaturalness when viewing both display images alternately.Furthermore, Another advantage is that maintenance is easy, as maintenance, inspection, and replacement of the illumination light source only need to be done once.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of one embodiment of the vehicle display device according to the present invention, FIG. 2 is a schematic diagram of another embodiment of the vehicle display device according to the present invention, and FIG. 3 is a conventional vehicle display device. FIG. 4 is a perspective view showing the state in which the display device is attached, and FIG. 4 is a sectional view taken along line AA in FIG. 3. 15... Case, 16.18... Transmissive liquid crystal panel, 17.19... Light diffuser plate, 20... Illumination light source, 2
1... Light reflector, 22... Magnifying lens, 23...
Total reflection mirror, 24...Acrylic curved plate.

Claims (1)

[Claims] In a vehicle display device having a head-up display section that forms a driving information display image on the outside front of the windshield and a head-down display section that displays driving information in front of the driver's seat in the vehicle interior, a head-up display device is used. The display panel of the head-down type display unit and the display panel of the head-down type display unit are arranged close to each other back-to-back, almost coaxially, and one side is placed between the two display panels.
A display device for a vehicle, characterized in that two light sources are arranged to serve as a common light source for both display sections.