JPS5892816A - Course guiding display for mounting on vehicle - Google Patents

Abstract

PURPOSE:To make the device small-sized, by using a liquid crystal display and projecting map information recorded on microfilms by a projector. CONSTITUTION:Coordinates of the traveling position of a vehicle are operated on the basis of information obtained from a direction sensor and a speed sensor, and a traveling course 2 is traced on a transmission type liquid crystal display 11 on the basis of operation results. Maps of regions where the vehicle travels are recorded on microfilms, and they are stored in a map film cartridge 12, and a map is selected to lead out the current position on the irradition face. By irradiation of a light source 13 for projection, the traveling course 2 traced on the transmission type liquid crystal display 11 and the map selected by the map film cartridge 12 are magnified by a magnifying lens system 14 and are projected onto a projection screen 15 and are superposed and displayed.

Description

DETAILED DESCRIPTION OF THE INVENTION Manufactured by F14, an in-vehicle course guidance display device, in particular, is equipped with a direction sensor and a speed sensor, for example, to display the traveling trajectory of a passenger car on a display screen, and to display a map on the display. In the in-vehicle course guidance display device, the above-mentioned running trajectory was traced using a liquid crystal display as the above-mentioned display, and this was recorded on microfilm or microfiche. The present invention relates to a vehicle-mounted course guidance display device that displays map information in a superimposed manner.

The present applicant installed a direction sensor and a speed sensor so that the travel trajectory of the passenger car can be sequentially plotted on a CRT display, for example, as the vehicle travels, and a map is superimposed on the display screen of the display. In addition, we have developed an in-vehicle course guidance display device that allows the driver to confirm the driving position, and have filed an application.

This in-vehicle course guidance display device has an appearance as shown in FIG. - The map sheet 3 is inserted along the map sheet insertion guide 4, and is fixed by the map sheet fixing means 5 so that the travel trajectory 2 and the map-specific road □ are superimposed.

Regarding the internal structure plotted on the t-CRT display of the above-mentioned running trajectory 2, please refer to the patent application filed in 1986-664.
01, etc. This in-vehicle course guidance display device has the great advantage of being able to display the travel trajectory 2 and the map in a superimposed manner, allowing the driver to confirm his or her own travel position by comparing it with the map. However, since the above-mentioned CRT display is used, it does not consume a large amount of power for display, and because CRT is self-luminous, when the screen receives sunlight during the day, the CRT
The disadvantage is that it is difficult to display the actual driving trajectory 2 clearly by increasing the brightness. Furthermore, since the CRT display is relatively large in volume, there are restrictions on where it can be mounted in a car. Furthermore, in terms of operation, there are also disadvantages in that it is difficult to align the initial transparent map sheet 3 with the traveling trajectory 2, and that replacing the map is extremely complicated.

1. The purpose of the present invention is to solve the above-mentioned drawbacks by simplifying alignment with maps and obtaining clear image information, and by making it possible to make the device thinner and more compact. . This will be explained below with reference to the drawings.

FIG. 2 shows the main part of an embodiment of the present invention. In the figure, reference numeral 2 denotes the travel path, 11 is a transmissive liquid crystal display on which the travel path 2 is traced, 12 is a map film cartridge from which a desired map can be selected, 13 is a projection light source, and 14 is a magnifying lens. system, 15 is a projection screen, 1
6 represents nine projected roads, and 17 represents a projected travel trajectory.

Based on the information obtained from the direction sensor (not shown) and speed sensor (not shown), the coordinates of the vehicle's running position are calculated, and based on the results, the running trajectory 2 is displayed on the transmissive liquid crystal display. 11. on the other hand,
A map of the area in which the vehicle is traveling is recorded on microfilm and stored in the map film cartridge 12, and the map is selected by an appropriate means to display the irradiation surface so that the current position of the vehicle can be displayed. drawn out. By the irradiation of the projection light source 13, the traveling locus 2 traced on the transmissive liquid crystal display 11 and the map selected by the map film cartridge 12 are magnified via the magnifying lens system 14t, and displayed on the projection screen. 15
It is projected on top and displayed superimposed.

FIG. 3 shows another embodiment of the invention. Symbol 2.1 in the figure
1, 13, 15, 16, and 17 correspond to FIG. 2, and 18 represents a microfiche on which map information is recorded. The map film cartridge 12 shown in FIG. 2 makes it easy to search for the required location, but instead a microfiche 18 as shown in FIG.
You may also use a map sheet by Although the operation of the map sheet is slightly more complicated than when using a map film cartridge mechanism, it is possible to superimpose the travel trajectory 2 on the transparent liquid crystal display 11 and the transparent map sheet on the microfiche 18 and project it from the back. By irradiating the vehicle with the light source 13, the travel trajectory 17, the road 16, etc. can be easily displayed on the projection screen 15. (For convenience of illustration, the projection screen 15 is shown in a reduced size.) Figure 4 shows the method for writing the traveling trajectory. corresponding to 19
20 represents an infrared laser light source, 20 represents a movable mirror, and 21 represents an infrared laser beam. Transmissive liquid crystal display 11
To write the traveling trajectory 2 to , select the interelectrode terminal,
Generally, a voltage is applied to drive the liquid crystal to draw dots, but an infrared laser may also be used, as shown in FIG. The infrared laser beam 21 irradiated from the infrared laser light source 19 is transmitted to the movable mirror 2.
0, it is reflected at an appropriate position, and a travel trajectory 2 is written on the liquid crystal display 11.

The movable mirror 20 is configured to be able to vary the angle of reflection of the infrared laser beam 21, and has a mechanism that allows it to freely write a traveling trajectory in the X and Y directions. Of course, it goes without saying that the movable mirror 20 is driven in accordance with coordinate information obtained based on output information from the direction sensor and speed sensor.

A specific explanation will be given of the case where the thermo-optic effect is applied to the above writing method on a liquid crystal display using an infrared laser. A liquid crystal obtained by mixing a cholesteric liquid crystal with a nematic liquid crystal having negative dielectric anisotropy exhibits a cholesteric phase in the liquid crystal temperature range and has a helical structure. Initially, the liquid crystal has a Grandshuan structure with the helical axis perpendicular to the wall surface, and is transparent. When the temperature is raised to turn it into a liquid and then returned to the cholesteric phase, it becomes a 7-helical monochalconic structure with random helical axes due to thermal disturbance, and becomes cloudy. Applying this effect, by irradiating the display panel with an infrared laser and heating it locally so that it becomes a liquid, by removing the laser beam or moving it to another position, the heated part will cool down and become a liquid. It becomes cloudy and you can write on it. By applying pressure in this manner and scanning the liquid crystal panel one after another with a laser beam, any image can be imprinted on it.

To erase it, just apply high frequency sound. Liquid crystal valve: The cells are aligned parallel to the electrodes and return to the original Grandshuan structure, so they are easily erased.

FIG. 5 shows the configuration of a main part of an embodiment of the present invention using a reflective liquid crystal display. In carrying out the present invention, a reflective liquid crystal display is used to trace the traveling trajectory, and a reflective liquid crystal display panel is used. It is also possible to display map information and travel trajectory information by using the surface plate as a map projection surface and superimposing the travel trajectory and map surface image. In Figure 5, code 2.12.13.1
4 corresponds to FIG. 2, 22 is a reflective liquid crystal display,
23 represents a reflecting plate.

The traveling trajectory 2 is displayed and traced by the liquid crystal of the reflective liquid crystal display 22. A reflective plate 23 is provided on the back surface of the reflective liquid crystal display 22 . To display map information, as in the case shown in FIG. 2, a desired map is selected in advance using the map film cartridge 12 containing the microfilm on which the map is recorded, and then the projection light source 13 is used to display the map information. Irradiation is performed so that the map gIt-enlarged by the magnifying lens system 14 is projected onto the reflective liquid crystal display 220 using the reflection plate 23t as a projection surface. In this way, the map surface image and the driving trajectory are superimposed and displayed on the channel surface of the reflective liquid crystal display 22, but the reflective liquid crystal display 22 is used as a screen for direct reflection resistant liquid crystal display 22. Since panels are used, the number of parts can be reduced and the structure can be simplified.

When a liquid crystal (cholesteric type) having a storage property is used as the reflection amount liquid crystal display 22, for example, once the travel trajectory i is recorded, the record can be retained until the next application of the erasing voltage. If such a liquid crystal is used, there is no need to constantly scan all pixels, and it becomes possible to drive using a simple driving method. Note that, as in the case shown in FIG. 3, a microfilm cartridge may be used instead of the map film cartridge 12.

As explained above, according to the present invention, it is possible to make the device thinner and the lid smaller, and unlike light-emitting displays such as CRTs, it is rounded and has a light-receiving type, even when exposed to direct sunlight during the daytime. Good contrast can be obtained. Also,
It is inexpensive and requires extremely little power for display. In particular, if the travel locus is written on a storage liquid crystal using an infrared laser, it is possible to write an infrared laser beam with a spot diameter of several μm using a relatively simple combination of an By scanning the laser tube, it is easy to record the travel trajectory. Map information is recorded on, for example, a 35 mm or 15 mm microfilm, and the drawing area by an infrared laser is only about 35 x 25 mm for a 35 mm microfilm, so the infrared laser scanning device is relatively small and lightweight. Become something. This feature is extremely advantageous for in-vehicle devices that require vibration resistance and impact resistance. In addition, since the map surface image and the travel trajectory are displayed superimposed on the same plane, there is no misalignment between the map and the travel trajectory even when viewed from a position away from the front of the screen. By combining it with a cartridge mechanism, etc., it is possible to easily search for the necessary part, and it has a high degree of decomposition as a recording material, for example, 80 to 140 films/mm in the case of color microfilm, and it is easy to use on the display panel. A clear image of Kanji mixture 9 can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a conventional in-vehicle course guidance display device, Fig. 2 is a main part configuration of an embodiment of the present invention, Fig. 3 is another embodiment of the present invention, and Fig. tllJ4 is a drawing of a traveling trajectory. FIG. 5, which is an explanatory diagram of one aspect of the system, shows the main part configuration of another embodiment of the present invention. In the figure, 2 is the running trajectory, 11 is a transmissive liquid crystal display,
12 is a map film cartridge, 13 is a projection light source, 14 is a magnifying lens system, 15 is a projection screen, 18 is a microfiche, 19 is an infrared laser light source, 20 is a movable mirror, 21 is an infrared laser beam, 22 is a Reflective liquid crystal display, 23 represents reflection @ Patent applicant: Alps Electric Co., Ltd. Patent attorney Hiroshi Mori 1)

Claims (1)

[Scope of Claims] (1) A display is provided which is equipped with a direction sensor and a speed sensor and displays the traveling trajectory of the vehicle based on the respective outputs of the axillary direction sensor and the speed sensor, and the display In the in-vehicle course guidance display device configured to superimpose a map on the above-mentioned driving trajectory and display the driving position of the vehicle in association with the above-mentioned map, the display is constituted by a liquid crystal display. At the same time, the map is projected by a projector that projects map information recorded on microfilm or microfiche, and the vehicle's location is displayed based on the travel trajectory drawn on the liquid crystal and the map. An in-vehicle course guidance display device characterized in that: (1) The on-vehicle course guidance display device according to claim (1), wherein the liquid crystal display is constituted by a transparent liquid crystal display, and the traveling trajectory is written on by an infrared laser beam. (3) The vehicle-mounted course guidance display device according to claim (1), wherein the liquid crystal display is constituted by a reflective liquid crystal display and serves as a projection screen for the map.