JPS59227531A - Projection type display unit for vehicle - Google Patents

Abstract

PURPOSE:To make such a car projection type display unit as being easy to see all the time attainable, by setting up a liquid crystal display unit as an indicator, while changing it from a positive indication to a negative one according to brightness around. CONSTITUTION:A liquid crystal display unit 4 indicates characters in the specified display pattern by a command out of a display control part 6. At this time, the liquid crystal display unit 4 operates with a positive indication in the day time but in time of dark at night, it operates with a negative indication with a lamp 6 lighted. Indication light shown by the liquid crystal display unit 3 is projected as a virtual image pattern 8 produced by turning over the indicated pattern with front glass 1, which is sighted by a driver. In addition, with an adjusting knob 7, an angle of inclination of a display screen on the liquid crystal display unit 4 is made variable while checking a position of the virtual image pattern 8 projected on the front glass 11 or its projection state. With this constitution, a projection type display for car easy to see all the time can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device for a vehicle, and particularly to a projection type display device for a vehicle that projects meter displays onto a windshield.

Conventional projection display devices for vehicles do not take into account the brightness of the surroundings (they have the disadvantage that they are very difficult to see depending on the illuminance).

The present invention was invented in view of the above-mentioned problems, and its purpose is to provide a vehicle that is always easy to see by installing a liquid crystal display as a display and switching between a positive display and a negative display depending on the surrounding brightness. The details will be explained based on the drawings.

In FIGS. 1 and 2, 1 is a windshield of a vehicle, and 2 is a dash board. The dash board 2 includes a display device 3 for displaying a desired display, such as a speed display. The display device 3 is a liquid crystal display device 4 with a display surface on two sides.
, behind which are an illumination light 5 and a display control section 6 that controls the display on the liquid crystal display 4. The liquid crystal display 4 has a virtual image pattern as shown in FIG. 3 (al) as shown in FIG. 3 (b+).

The operation of the above configuration will be explained.

The liquid crystal display 4 displays a predetermined display pattern according to commands from the display control section 6. At this time, the liquid crystal display 4 shows a positive display as shown in FIG. , a negative display as shown in FIG. 4(I)) is performed. The display light displayed on the liquid crystal display 3 is projected on the windshield 1 as a virtual image pattern 8 that is an inversion of the display pattern, and is visually observed by the driver. Also, while checking the position and projection condition of the virtual image pattern 8 projected onto the windshield 1 using the adjustment knob 7,
The inclination of the display surface of the liquid crystal display 4 can be varied.

For reference, a vehicle projection display device using a self-luminous display device is shown below. In FIGS. 5 and 6, 9 is a self-luminous display device such as a light emitting diode, and 10
1 is a display control unit, 11 is a convex lens such as a frillel lens that magnifies the display light from the display 9, 12 is a projection unit equipped with a half mirror to project the display light, and 13 is a shielding tube that blocks external light. be. The projection part 12 can adjust its inclination depending on the projection condition of the display light, etc., and is placed near the front glass at a position where it is easy to see when driving without depending on the part of the field of view.

Since the present invention has the above-described configuration and operation, it produces the following effects.

By installing a liquid crystal display as a display 2 and switching between a positive display and a negative display depending on the surrounding brightness, it was possible to provide a projection type display device for a vehicle that is always difficult to see.

[Brief explanation of drawings]

1 to 4 (I) show an embodiment of a projection display device for a vehicle according to the present invention, in which FIG. 1 is a front view and FIG. 2 is a line taken along arrow A-A in FIG. 1. A cross-sectional view of the direction, FIG. 3 (al is an explanatory diagram of an example of a display pattern of a liquid crystal display, FIG. 3 (1))
is a virtual image projected from the display pattern example shown in FIG. 3 (al), FIG.
Figures (bl is an explanatory diagram of a negative display on a liquid crystal display, FIG. 5 is a front view showing a reference example of a projection type display device for a vehicle, and FIG. 6 is a view taken from the arrow r3-B in FIG. 5)! It is a sectional view of the direction. 1... Front glass, 2... Dashboard 1-13
・Display device, 4 Liquid crystal display, 5...Lighting device, 7...
High 1 coarse knob Figure 1 Figure 2 Figure 4 (a) Figure 4 (b) Figure 3 (a) Figure 3 (b) Figure 5 Figure 6

Claims (1)

[Claims] Display light is projected onto the windshield of the vehicle (a liquid crystal display built into the dash board, an adjustment mechanism for adjusting the inclination of the display surface of the liquid crystal display, and a lighting lamp provided on the opposite side of the display surface). A projection type display device for a vehicle, characterized by comprising: