JPH08175227A - Display device - Google Patents

Abstract

PURPOSE: To increase the brightness balance of a device, and to realize a small size, by providing a semipermeable reflector plate which permeating displays a fluorescent display lines, and refecting displays a liquid crystal lines, and making the reflectance of the reflector plate at a specific value. CONSTITUTION: The first display 12 uses a fluorescent display tube and meter displays the car speed and the like, while the second display 13 carries out a navigation display, for example, by using a liquid crystal element. A semipermeable reflector plate 17 is provided between both displays, and its reflectance is 47 to 66%, while its permeability is made 20 to 33% being about 1/2 times the reflectance. As a result, since the meter display by the first display 12 permeates the semipermeable reflector plate 17, an expansion display is carried out by an expansion lens 16 by an attenuated brightness. And the navigation display by the second display 13 is reflected by the semipermeable reflector plate 17, and expanded by the expansion lens 16, but it does not permeate the semipermeable reflector plate 17, and almost no attenuation of brightness is generated. Consequently, the brightness of the second display with a relatively low value is maintained almost as it is, so as to improve the brightness balance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display device which is installed in, for example, an automobile and can perform two displays such as a meter display of vehicle speed and engine speed, and a navigation display such as a map.

[0002]

2. Description of the Related Art As a conventional display device capable of performing the above two types of display, there is, for example, a structure as shown in FIG.

For example, a first display 2 and a second display 3 using, for example, a fluorescent display tube are incorporated in an instrument panel 1, and the display by the first display 2 is as follows.
There is a structure in which a real image is displayed through the half mirror 4, and the display by the second display device 3 is reflected by the reflecting mirror 5 and then reflected by the surface of the half mirror to be displayed as a virtual image 3 ′. .

[0004]

However, since the display device having such a structure has a structure in which two kinds of display devices are incorporated by utilizing the narrow space in the instrument panel, The size of the display unit to be built into was naturally limited, and it was impossible to install a large display unit.

Therefore, for example, by the above-mentioned first indicator,
When vehicle information such as vehicle speed and engine speed is displayed and navigation display is to be performed on the second display, at least the second display is required to be a large display screen. However, it was difficult to increase the size of the display in terms of space.

Further, a high-luminance self-luminous fluorescent display tube or the like can be used as the first display for displaying vehicle information, but the second display for displaying a navigation map or the like is a dot matrix. It is conceivable to use a liquid crystal display in the form of a liquid crystal display, but if the second display is a liquid crystal display, it is attempted to increase the brightness balance of both the display and the high brightness display by the first display. For example, it is necessary to increase the brightness of the second display, and in order to increase the display brightness of the second display, a high-intensity back lamp must be installed, which causes deterioration of the liquid crystal display element. Induced, and further, there is a problem that the price becomes high.

[0007]

The present invention has been made in view of the above-mentioned conventional problems, and the first one is a first indicator installed in a narrow space such as the inside of an instrument panel. , The second display is made small in order to enable the equipment in the small space, and the display image of these displays is enlarged and displayed by using a magnifying lens to improve the visibility. .

The second one is that one of the displays is a display by a fluorescent display tube (VFD) and the other display is a display by a dot matrix liquid crystal display device (LCD), and the display is the same. In order to enhance the brightness balance between the display brightness of the display by the LCD and the display brightness of the display by the liquid crystal display element, the display image by the fluorescent display tube is transmitted through the half mirror to attenuate the display brightness and the brightness by both displays. It is to provide a display device with improved balance and excellent visibility.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to embodiments shown in the drawings.

In FIG. 2, reference numeral 11 denotes an instrument panel located in front of a driver's seat of an automobile. At a front portion of the instrument panel 11, there is provided a first display 12 whose display surface is directed obliquely upward. A second indicator 13 having a display surface facing downward is arranged in the upper part of the instrument panel 11.

The first display 12 uses a fluorescent display tube, and for example, as shown in FIG. 3, the vehicle speed, the engine speed,
The second display 13 is a display for displaying the fuel amount, the liquid temperature, etc. by a meter, and the second display 13 uses a dot matrix type liquid crystal display device to display a navigation display 15 shown in the central portion of FIG. 4, for example. It is a display that can.

Reference numeral 16 denotes a magnifying lens which is installed in front of the first display 12 and the second display 13 (toward the driver). The magnifying lens 16 is, for example, one or two. It is composed of a convex lens or a Fresnel lens.
Reference numeral 17 denotes a semi-transmissive reflection plate (half mirror) which is arranged between the first display 12 and the second display 13 at an inclination of approximately 45 degrees on the side surface, and 18 is in front of the magnifying lens 16. It is a smoked front cover.

The reflectivity of the semi-transmissive reflector 17 is 47-6.
The front cover has a characteristic that the transmittance is 6% and the transmittance is 20 to 33% which is about ½ the reflectance, and the front cover has a characteristic that the transmittance is 15 to 30%. Uses a smoked acrylic board.

The structure of this embodiment has been described above. Next, its operation will be described.

Meter display 14 by the first display 12
Is a relatively high-brightness display because it is a display by a fluorescent display tube, and the navigation display 15 by the second display 13 is a relatively low-brightness display by a transmissive liquid crystal display element.

Therefore, the meter display 14 on the first display 12 is transmitted through the semi-transmissive reflection plate 17 and then enlarged and reflected by the magnifying lens, and the magnified reflection image is enlarged and displayed as a virtual image in the front. Since the display 14 is transmitted through the semi-transmissive reflector 17, the display brightness of the first display 12 is attenuated by the semi-transmissive reflector 17 in relation to the transmissivity of the semi-transmissive reflector 17. The meter display 14 is enlarged and displayed with the attenuated luminance.

The navigation display 15 by the second display 13 is displayed in the front as a magnified reflection virtual image which is reflected by the semi-transmissive reflection plate 17 toward the magnifying lens and further magnified by the magnifying lens 16. Is. The brightness of the image displayed by the second display is determined by the reflectance of the semi-transmissive reflector 17, but the image displayed by the second display does not pass through the semi-transmissive reflector, so the brightness is attenuated. Can be almost ignored.

As described above, in the present embodiment, the brightness of the display 14 by the first display, which is relatively high by displaying the fluorescent display tube with high brightness, is attenuated by the semi-transmissive reflection plate 17. In addition, since the brightness of the display 15 by the second display having a relatively low brightness using the transmissive liquid crystal display element is the same as that of the backlight by the second display, the brightness of the first and the second is maintained. It is possible to enhance the display luminance balance by the display device of No. 2.

Therefore, for example, as shown in FIG. 4, when the meter display 14 and the navigation display 15 are simultaneously displayed, the display luminance balance of both displays is good and the visibility is improved.

Further, as in the above-mentioned embodiment, the images displayed by the first display device and the second display device are enlarged and displayed by the magnifying lens 16, so that the first display device and the second display device can be made compact. However, since it is possible to expect a large-sized display, the economy accompanying the miniaturization of the first and second displays and the ease of installation in a small space are improved.

Further, since it is not necessary to increase the brightness of the second display by attenuating the brightness of the image displayed by the first display, it is possible to suppress the heat generation of the backlight by the second display. Therefore, the heat resistant structure is easy and the durability is also improved.

[0022]

As described above, according to the present invention, the first display 12 constituted by either the fluorescent display tube or the liquid crystal display element and the second display 1 constituted by the other one thereof.
3 and a semi-transmissive reflection plate 17 for transmitting and displaying the display image by the fluorescent display tube and for reflecting and displaying the display image by the liquid crystal display element. The semi-transmissive reflection plate 17 has a reflectance of the semi-transmission reflection plate. Since it is a display device having a characteristic about twice as high as the transmittance of the display device, according to this, it is possible to display both the meter display and the navigation display with a good luminance balance on the fluorescent display tube and the liquid crystal display element. it can. Further, according to the present invention, the first display 12 constituted by either the fluorescent display tube or the liquid crystal display element, the second display 13 constituted by the other one, and the display image by the fluorescent display tube. And a magnifying lens 16 that magnifies and displays each of the display images reflected and transmitted by the semi-transmissive reflection plate 17.
Since it is a display device having a display, the display image on both displays is enlarged by the magnifying lens 16 so that the first display and the second display can be made small but large-sized. As a result, it is possible to obtain the effect that the downsizing of the first and second displays improves the economy and the facility of the equipment is improved in a narrow space.

[Brief description of drawings]

FIG. 1 is a structural explanatory view showing a conventional display device.

FIG. 2 is a structural explanatory view showing a display device according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram showing a meter display mode of the embodiment of the present invention.

FIG. 4 is an explanatory diagram showing meter display and navigation display modes of the embodiment of the present invention.

[Explanation of symbols]

11 ... Instrument panel 12 ... 1st display 13 ... 2nd display 14 ... Meter display 15 ... Navigation display 16 ... Magnifying lens 17 ... Semi-transmissive reflector 18 ... Front cover

Claims (3)

[Claims] 1. A first display (12) composed of either a fluorescent display tube or a liquid crystal display element, a second display (13) composed of the other, and a fluorescent display. It has a semi-transmissive reflection plate (17) for transmitting and displaying the display image by the tube and reflecting and displaying the display image by the liquid crystal display element. The semi-transmission reflection plate (17) has a reflectance of that of the semi-transmission reflection plate. A display device having a characteristic of about twice the transmittance. 2. A first display (12) composed of either a fluorescent display tube or a liquid crystal display element, a second display (13) composed of the other, and a fluorescent display. A semi-transmissive reflection plate (17) for transmitting and displaying a display image by a tube and a display image for a liquid crystal display element, and an enlarged display of each display image reflected and transmitted by the semi-transmission reflection plate (17). Display having a magnifying lens (16). 3. A first display (12) composed of either a fluorescent display tube or a liquid crystal display element, a second display (13) composed of the other, and a fluorescent display. A semi-transmissive reflection plate (17) for transmitting and displaying a display image by a tube and a display image for a liquid crystal display element, and an enlarged display of each display image reflected and transmitted by the semi-transmission reflection plate (17). A display device having a magnifying lens (16), and further, the semi-transmissive reflection plate (17) has a reflectance about twice that of the semi-transmission reflection plate. ..