JPH0385579A - Display controller for navigation system - Google Patents

Abstract

PURPOSE:To immediately switch the color design to desired one by selecting a color combination corresponding to the ambient brightness from plural color combinations and converting each picture element data to the selected color signal and supplying it to a display device. CONSTITUTION:A picture element data/color signal conversion table 13 has plural color combinations corresponding to respective picture element data. A table selecting means 15 selects the color combination corresponding to the ambient brightness from plural color combinations. A picture element data/color signal converting means 14 converts each picture element data to the color signal selected by the table selecting means 15 and supplies it to a display device 4. Consequently, a picture having the brightness corresponding to ambient circumstances is presented to the display device 4, and it is unnecessary to rewrite picture element data in a picture memory 12. Thus, an operator performs the color design switching operation to immediately switch the color design to desired one.

Description

[Detailed Description of the Invention] Industrial Application Fields The present invention relates to a display control device for an on-vehicle navigation system that displays the current location of a vehicle and a map of the surrounding area of the vehicle, and particularly relates to a display control device for an on-vehicle navigation system that displays the current location of a vehicle and a map of the surrounding area of the vehicle. The present invention relates to a display control device that allows changing the color of objects such as objects depending on the brightness of the surroundings.

<Prior art and problems to be solved by the invention> In the conventional display control device of an in-vehicle navigation system, the current position of the vehicle detected by a locator and a map around the current position stored in a map memory, etc. Each figure is drawn in the image memory to create figure data as shown in FIG.

This drawn figure (current position mark A in the figure).

The current position, roads, surrounding buildings, etc. are converted into color signals by referring to one type of color combination table (see Group 3) for converting each pixel data of road 81back C, etc.) into color signals. , this color signal is displayed on a color display.

By the way, when a map is displayed by a display control device, if the same color design is used for both day and night, the brightness of the surroundings will be different between day and night.

Therefore, it is necessary to make the image displayed on the display easier to see by displaying it in a design with bright colors that match the brightness of the surroundings during the day, and conversely, displaying it in a dark color design at night. .

In conventional display control devices, switching between day and night is performed by rewriting pixel data in an image memory. That is,
The currently displayed daytime pixel data (Table 2 below) is rewritten to nighttime pixel data (Table 3 below) in correspondence with the table for converting each pixel data into a color signal (Table 1 below). be.

Table 1 Table 2 Table 3 However, since map information includes a large amount of data on buildings, railways, rivers, etc. in addition to the information shown in the table above,
Since it takes time to rewrite pixel data, there is an inconvenience that even if the driver performs a switching operation to a desired color design, the switching does not occur immediately.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a display control device that can immediately switch to a desired color design when the driver performs a switching operation to the color design.

Means for Solving the Problems and Effects> This invention to achieve the above object draws the current position of the vehicle detected by a locator and a map around the current position in an image memory, and stores the current position in the image memory. This is a display control device that converts each drawn pixel data into a color signal and displays it on a display, and has the following features. That is, a pixel data/color signal conversion table having a plurality of color combinations corresponding to each pixel data, a table selection means for selecting a color combination corresponding to the surrounding brightness from among the plurality of color combinations, and and pixel differential color signal conversion means for converting the data into a color signal selected by the table selection means and supplying it to the display.

With the above invention, a desired color combination is selected from a plurality of color combinations by the table selection means depending on whether the display screen is bright or dark relative to the surroundings. Next, each pixel data is converted into a color signal selected by the table selection means by the pixel default color signal conversion means. The converted color signal, that is, the video signal is then supplied to the display.

This provides the display with an image whose brightness matches the surrounding environment.

Further, the pixel data/color signal conversion table has two types of color combinations, one for normal use and one for night use, and the table selection means selects one of the color combinations for normal use and night use according to ON/OFF of a headlight switch of the vehicle. If a color combination is selected, the color design can be changed by turning on/off the headlight switch of the vehicle.

<Example> Hereinafter, a display control device for a navigation system according to the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a functional block diagram showing an embodiment of a display device according to the present invention. In the figure, 1 is a display control device, and a locator device 2, a map memory 3, a color display 4, and a display color changeover switch 5 are connected to the display control device 1.

The locator 2 detects the current position of the vehicle based on travel distance data and travel direction data of the vehicle. Methods for detecting the position of the locator 2 include a method using so-called map matching navigation and a method using dead reckoning navigation, and it is possible to employ either method. The map memory 3 stores a road map within a predetermined range (for example, within Japan) divided into multiple scales, and the stored contents include roads, intersections, famous buildings, railways, rivers, etc. This is the background map.

The display control device 1 includes a drawing section 11. Image memory 12, pixel data/color signal conversion table 13, table selection section 14
, a pixel data/color signal converter 15.

The drawing unit 11 draws the current position detected by the locator 2;
Then, each figure of roads, buildings, etc. around the current position is written into the image memory 12. This drawn figure is similar to that shown in FIG.

At this time, pixel data (numbers) defined in Table 4 below are given to each figure and background.

Table 4 The image memory 12 stores each figure written by the drawing section 11 as image data.

The pixel data seven-color signal conversion table 13 has two types of tables in which the color combinations of each pixel data are different depending on day and night. That is, the background is brightly colored during the day and darkly colored during the night. An example is shown in Table 5 below.

Table 5 The table selection unit 14 receives a switching signal from the display color changeover switch 5 and selects a desired color combination from two types of color combination tables: day and night.

As the display color changeover switch 5, a dedicated manual changeover switch may be provided, but it is also possible to use a vehicle headlight switch. That is, the table selection section 14 automatically selects a table depending on whether the headlight switch is turned on or off. It is also possible to use an illuminance sensor. That is, with this, the brightness is detected and the detected signal is supplied to the table selection section 14 as a switching command signal.

The pixel data 7 color signal converter 15 converts each pixel data into a color signal corresponding to the table selected by the table selector 14, and outputs this to the display.

The color display 4 displays the current position, roads, buildings, background, etc. based on color signals, that is, video signals.

In the display device of the navigation system of the above embodiment, when the display color changeover switch 5 is operated to desire a daytime color design, the table selection section 14 selects table 1, and the pixel data/color signal conversion section 15 selects the table 1. However, by referring to Table 1 and converting the pixel data into a color design for daytime use, the background color is displayed in a color (for example, white) that is comparable to daytime brightness. Conversely, if you operate the display color changeover switch 5 and desire the nighttime display color,
Table 2 is selected, and the pixel data/color signal converter 15
By referring to Table 2 and converting the pixel data to a color design for nighttime use, the background color can be changed to a dark color (
(for example, black), making it easier to see.

<Effects of the Invention> According to the present invention, a desired color combination is selected from among a plurality of color combinations by the table selection means depending on whether the display screen is bright or dark relative to the surroundings, and the pixel data/color signal is By converting each pixel data into the color signal selected by the table selection means by the conversion means, there is no need to rewrite the pixel data in the image memory as in the conventional case. This provides the advantage of being able to display maps and the like in display colors that match the surrounding brightness.

[Brief explanation of drawings]

FIG. 1 is a functional block diagram showing an embodiment of a display device according to the present invention, and FIG. 2 shows graphics written in the image memory 1...
Display control device, 5...Display color changeover switch, 11.
...Drawing unit, 12...Image memory, 13...Pixel data color signal conversion table, 14...Table selection unit, 15...Pixel data 7 color signal conversion unit

Claims (1)

[Claims] 1. The current position of the vehicle detected by a locator and a map around the current position are drawn in an image memory, and each pixel data drawn in this image memory is converted into a color signal and displayed on a display. In the display control device of the navigation system to be displayed, a pixel data/color signal conversion table having a plurality of color combinations corresponding to each of the above pixel data, and a color combination corresponding to the surrounding brightness from among the above plurality of color combinations are selected. A display control device for a navigation system, comprising: table selection means for converting each pixel data into a color signal selected by the table selection means, and pixel data/color signal conversion means for converting each pixel data into a color signal selected by the table selection means and supplying it to a display. 2. The pixel data/color signal conversion table has two types of color combinations for daytime and nighttime, and the table selection means
2. A display control device for a navigation system according to claim 1, wherein either a daytime color combination or a nighttime color combination is selected depending on whether a headlight switch of a vehicle is turned on or off.