JPH06258085A - Map information display apparatus - Google Patents

Abstract

PURPOSE:To display an actual geographic azimuth in coincidence with a direction of a map displayed on a screen irrespective of a variation in a direction of a map information display apparatus to be used by portability, on-board, etc. CONSTITUTION:Map data is stored to previously match a reference azimuth N in an image data file 27, and a deviation angle phi from the azimuth N of a body 11 is counted by an up-down counter 25 based on A-, B-phase signals (a), (b) from photoreceivers 23a, 23b and an N-pole signal (c) from a photoreceiver 23c by a relative rotation of an apparatus body 11 of a slit disk having an azimuth magnet. A displacement angle phi is added by an azimuth operator 26 to a polar coordinates address to the file 27, converted to rectangular coordinates address (x, y) through a coordinates converter 29, addressed in an image data memory 30, and its display area of the map data is rotated in response to a change in a body azimuth to be displayed on a display unit 12.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a map information display device used in a mobile phone, a vehicle, or the like.

[0002]

2. Description of the Related Art In recent years, the performance of portable information processing devices has been remarkably improved, and due to the increase in storage capacity and the increase in definition and size of display devices, it is possible to display image information such as maps with high quality. ing.

For example, in an electronic notebook or the like, application software for displaying a map of a city such as a restaurant guide is in practical use. In addition, in the in-vehicle type information processing device, a navigation system or the like that displays the position of the own vehicle on the map information is also realized. Conventionally, when displaying a map with these devices, the display direction of the map with respect to the device body is generally fixed, such as defining the upper side of the display screen in the north direction.

[0004]

Therefore, in order to view the map while carrying the display device for the map information or while traveling on an actual road with the display device mounted on the vehicle, the direction in which the user (own vehicle) is facing, In other words, the direction (direction) the device is facing
If is other than north, the actual geographical direction for oneself does not match the display direction of the map, and there is a problem in usability.

The present invention has been made in view of the above problems.
An object of the present invention is to provide a map information display device capable of displaying the actual geographical direction and the direction of a map displayed on the screen in correspondence with each other regardless of the change in the direction of the device. To do.

[0006]

That is, a map information display device according to the present invention stores storage means for storing map data in accordance with a preset reference direction, and map data stored in the storage means. Address generating means for instructing with a polar coordinate address with the center as the origin, display means for displaying map data read from the storing means in accordance with the polar coordinate address instructed by the address generating means, and the direction in which the apparatus main body is facing. The azimuth detecting means for detecting the azimuth detecting means, the azimuth deviation detecting means for detecting the deviation angle of the azimuth of the apparatus main body obtained by the azimuth detecting means from the reference azimuth, and the azimuth deviation detecting means for detecting the azimuth deviation from the reference azimuth. The polar coordinate address designated by the address generating means is corrected according to the shift angle, and the map data displayed by the display means is corrected. It is constructed by a display control means for displaying rotated around the origin.

[0007]

In other words, the map data stored according to the preset reference azimuth is displayed with the orientation of the map converted according to the azimuth of the apparatus main body detected by the azimuth detecting means.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an external configuration of a map information display device. In FIG. 1, 11 is a map information display device body (hereinafter, referred to as device body 11), and 12 is a display unit (LCD).
Is.

In the case of this embodiment, the display unit 12 has a display pixel of 256 dots (0.3 mm / dot) in both length and width, and an LCD (liquid crystal display unit) having a screen size of 76.8 mm × 76.8 mm. Is used.

FIG. 2 is a diagram showing the structure of the azimuth detecting optical encoder incorporated in the map information display device. FIG. 2A is a plan view of the azimuth detecting optical encoder.
FIG. 1B is a side view of the optical encoder for azimuth detection.

In FIG. 2, reference numeral 13 is a slit disk made of a thin and light metal plate and having a diameter of about 46 mm. At the center of this slit disk 13, an orientation magnet 14 is attached along the disk surface. The slit disk 13 is rotatably attached to the display unit 12 horizontally with respect to a central shaft 15 which is perpendicular to the display unit 12.

On the outer peripheral portion of the slit disk 13, there are formed 360 rotation detecting slits 13a at equal intervals with a pitch of about 0.4 mm. Further, the rotation detecting slits 13a, ...
A slit 13b for N pole detection of about 0.2 mm is formed at one location inside.

At two locations facing the rotation detecting slits 13a of the slit disk 13, a rotation detecting A is provided.
A phase mask plate 16 and a rotation detecting B-phase mask plate 17 are fixedly provided on the apparatus main body 11 side, and three A-phase slits 16a are provided for each of the rotation detecting mask plates 16 and 17. And the B-phase slit 17a is formed.

Then, the rotation detecting mask plates 16 and 1 are provided.
7 and slit disc 13 rotation detection slit 13
The A-phase LED 1 is provided at each of opposing positions sandwiching a, ...
8a, B-phase LED 18b and A-phase photosensor 19
Photosensors 19b for a and B phases are provided.

Further, in a state where the upper surface of the apparatus main body 11 and the N pole of the azimuth magnet 14 in the slit disk 13 are aligned with each other, a mask for N pole detection is provided at a position facing the slit 13b for N pole detection. The plate 20 is the device body 1
It is fixedly provided on the first side. This mask plate 2 for N pole detection
For 0, the slit 20a for the N pole is formed.

An N-pole LED 21 and an N-pole photosensor 22 are provided at opposite positions sandwiching the N-pole detection mask plate 20 and the N-pole detection slit 13b of the slit disk 13.

FIG. 3 is a view showing the positional relationship between the slits 13a for detecting rotation of the slit disk 13 and the slits 16a and 17a for A phase and B phase respectively in the above map information display device.

The slit 16a for the A phase and the slit 17a for the B phase are out of phase with each other by 90 °.
Are arranged so as to detect the rotation detection slits 13a ,. FIG. 4 is a block diagram showing a configuration of an electronic circuit of the map information display device.

The A-phase light receiving circuit 23a is the A-phase LED.
The light from 18a is for amplifying and shaping the signal detected by the A-phase photosensor 19a through the A-phase slit 16a and the rotation detection slit 13a to be binarized. The signal a is supplied to the terminal D of the flip-flop circuit 24.

The B-phase light receiving circuit 23b is the B-phase LED.
The light from 18b passes through the B-phase slit 17a and the rotation detection slit 13a to amplify and shape the signal detected by the B-phase photosensor 19b, and binarizes the signal. The signal b is the terminal CK of the flip-flop circuit 24 and the up / down counter 25.
Is supplied to.

The light receiving circuit N23c is the LED 2 for the N pole.
The light from 1 is amplified and shaped by binarizing the signal detected by the photo sensor 22 for N poles through the slit 20a for N poles and the slit 13b for N pole detection, and the N pole signal from this light receiving circuit N23c. c is supplied to the up / down counter 25.

The flip-flop circuit 24 includes the A
Based on the A phase signal a and the B phase signal b from the phase light receiving circuit 23a and the B phase light receiving circuit 23b, the slit disk 1
3 detects the relative rotation direction of the device body 11 with respect to the device main body 11 and generates an up-down signal d (up "1", down "0") in synchronization with the rising edge of the input of the B-phase signal b to the terminal CK. The input value of the phase A signal to the terminal D is output as the up / down signal d, and the up / down counter 2
5 is supplied.

The up / down counter 25 receives the up / down signal d from the flip-flop circuit 24, the B-phase signal b from the B-phase light receiving circuit 23b, and the light receiving circuit N23c.
Based on the N-pole signal c from, the relative rotation direction and rotation amount of the slit disk 13 with respect to the apparatus main body 11, that is,
The deviation angle φ (0 ° to 359 °) of the apparatus main body 11 with respect to the reference azimuth (N in this embodiment) is counted.
In this case, when the count value φ = “0”, the upper side of the apparatus body 11 is oriented in the north (N) direction, and the up / down count signal e from the up / down counter 25 is sent to the azimuth calculation circuit 26. Supplied.

The image data file 27 has one screen 36.
Image data of 2 dots × 362 dots is stored for a plurality of screens, and the read address of this image data file 27 is polar coordinates (r, θ) “r = 0 to 181, θ = 0.
359 ”and is instructed by the address signal g from the address generation circuit 28.

Here, the display section 12 has one screen 362 dots × 3 stored in the image data file 27.
Of the 62-dot image data, 256 dots × 256 dots in the central portion are displayed, but since the display area needs to be rotated around the center of one screen as a direction change of the apparatus body 11, it is actually Display screen 256 dots x 25
Circular image data having a diameter of 362 dots between diagonals of 6 dots is required, and is stored in the image data file 27 as one screen 362 dots × 362 dots.

The azimuth calculation circuit 26, based on the up / down count signal e from the up / down counter 25 and the address signal g from the address generation circuit 28,
Polar coordinate address (r,
(r), (θ + φ), which is obtained by adding the deviation angle φ of the apparatus main body 11 with respect to the reference azimuth N to (θ), is generated as the display address signal i.

The display address signal i from the azimuth calculation circuit 26 is passed through the coordinate conversion circuit 29 to Cartesian coordinates j = (x,
y) and is output as the address of the image memory 30.

Here, the x-axis direction corresponds to the left-right direction of the apparatus body 11 (right is "+"), and the y-axis direction corresponds to the up-down direction of the apparatus body 11 (upper is "+"). (X, y)
Both values are in the range of 0 to ± 127.

The image memory 30 has the coordinate conversion circuit 29.
Based on the orthogonal coordinate address j = (x, y) obtained from the image data file 27, the image data of only one area of the image data of one screen stored in the image data file 27 is selectively stored. The image data stored in the image memory 30 is sequentially transferred to the display drive circuit 31 and displayed and output on the display unit (LCD) 12.

FIG. 5 shows the relationship between the detection signals from the A-phase and B-phase photosensors 19a and 19b of the map information display device and the binarized signals a and b from the light receiving circuits 23a and 23b. FIG.

Here, FIG. 5 (A) shows a case where the apparatus main body 11 is turned to the west direction and the slit disk 13 is rotated relatively clockwise, and FIG. 5 (B) is shown in FIG. 5 (B).
Shows a case in which the slit disk 13 is turned to the east direction and the slit disk 13 is relatively rotated counterclockwise. Next, the operation of the map information display device having the above configuration will be described. FIG. 6 is a diagram showing a change state of the image data (map) display area due to a change in the direction of the device body 11 in the map information display device.

That is, first, when the power source of the apparatus body 11 is turned on and the apparatus body 11 once turns to the north, the slit disk 13 of the azimuth detecting encoder (see FIG. 2) is moved relative to the apparatus body 11. Of the mask plate 20 for N pole detection when the main body 11 is turned to the north.
The positions of the pole slit 20a and the N pole detection slit 13b of the slit disk 13 are aligned, and the light from the N pole LED 21 is detected by the N pole photosensor 22.

Then, the binarization N from the light receiving circuit N23c is performed.
The pole signal c is supplied to the up / down counter 25, and the up / down counter 25 is reset to have the deviation angle counter value φ = “0”.

On the other hand, polar coordinate addresses (r, θ) are sequentially generated from the address generation circuit 28 in all combinations of r = 0 to 181, θ = 0 to 359, and one map image data of the image data file 27 is generated. When 32 is addressed in a circle having a diameter of 362 dots, the image data 33 addressed in the circle is transferred to and stored in the image memory 30.

Here, the address signal g from the address generation circuit 28 is also supplied to the azimuth calculation circuit 26, but the deviation angle φ = from the up / down counter 25 which is the other input of the azimuth calculation circuit 26. Since it is “0”, the display address signal i (= r, θ + φ) has the same value as the address signal g (= r, θ) from the address generating circuit 28. Then, in the coordinate conversion circuit 29, x = RT [r ² − (Rcos θ) ² ] RT [] indicates the range over which the square root (route) is applied. y = rcos θ

The orthogonal coordinates (x, y) are calculated in accordance with.
Therefore, one image data for (r, θ) from the image data file 27 will be stored in the image memory 30 addressed by (x, y).

In this case, the display area of one piece of map image data 32 in the image data file 27 is set to 32.
The map image data of 256 dots × 256 dots, which is a, is displayed on the display unit 12.

In the display state of the map image data as the display area 32a, when the orientation of the apparatus body 11 changes from northward to westward, the slit disk 13 rotates clockwise relative to the apparatus body 11. The detection signals from the A-phase and B-phase photosensors 19a and 19b and the A-phase and a-phase B photodetectors 23a and 23b from the A-phase signal a and B-phase signals It is obtained as the relationship shown in FIG.

Then, since the up / down signal d from the flip-flop circuit 24 becomes "1", the up / down counter 25 operates as an up counter, and the apparatus main body 11 is turned from true north to west several times. It is changed or the deviation angle φ is counted up from "0".

That is, when the shift angle φ of the apparatus main body 11 is obtained by the up / down counter 25, when the address signal g (= r, θ) from the address generation circuit 28, the display address signal i from the azimuth calculation circuit 26. Is (r, θ +
φ), and the Cartesian coordinate address j from the coordinate conversion circuit 29 is x = RT [r ² − (Rcos (θ + φ)) ² ] RT [] indicates the range over which the square root (route) is applied. y = rcos (θ + φ).

Therefore, the image data from the coordinate data file 27 is stored in the image memory 30 addressed by (x, y), and when the processing of the whole map image data 32 is completed, its display area is changed. 256 with 32b
Map image data of dots x 256 dots is image memory 3
0 is stored in the display area 32a, and the display area 32a in which the apparatus main body 11 is oriented to the true north is rotated by the angle φ in the west and is displayed on the display unit 12. Therefore, according to the map information display device having the above configuration, first, the map data is stored in the image data file 27 in advance in accordance with the reference azimuth N.

Then, by the relative rotation of the slit disk 13 provided with the azimuth magnet 14 with respect to the apparatus main body 11,
A-phase and B-phase signals a and b obtained from the A-phase and B-phase light receiving circuits 23a and 23b and N obtained from the light-receiving circuit N23c.
Based on the polar signal c, the up / down counter 25 counts the deviation angle φ from the reference direction N of the apparatus body 11, and the polar coordinate address (r, θ) for the image data file 27 is calculated by the direction calculation circuit 26. φ is added (r, θ + φ) and converted into a rectangular coordinate address (x, y) via the coordinate conversion circuit 29 to address the image data memory 30.

Then, the map image data read from the image data file 27 is displayed on the display unit 12 by rotating its display area according to the change in the orientation of the apparatus main body 11, so that the map image data can be actually used in a portable or in-vehicle state. When you look at the map while traveling along the road, the direction in which you (the vehicle) is facing,
In other words, even when the direction (direction) of the device is other than north, the actual geographical direction of the device and the display direction of the map can be matched, and a very convenient map information display device can be realized. .

Although the optical encoder is used for detecting the direction in the above embodiment, the direction of the earth's magnetism is detected by using the magnetic resistance, the Hall element, etc., and the direction in which the main body of the apparatus is facing is detected based on the detected direction. The map display may be detected and rotated to be displayed.

[0045]

As described above, according to the present invention, storage means for storing map data in accordance with a preset reference azimuth and polar coordinates having the center of the map data stored in this storage means as an origin. Address generating means designated by an address, display means for displaying the map data read from the storage means in accordance with the polar coordinate address designated by the address generating means, and orientation detecting means for detecting the orientation of the apparatus main body. And an azimuth deviation detecting means for detecting a deviation angle of the azimuth of the apparatus main body obtained by the azimuth detecting means from the reference azimuth, and the azimuth deviation detecting means according to the deviation angle from the reference azimuth obtained by the azimuth deviation detecting means. The polar coordinate address designated by the address generating means is corrected, and the map data displayed by the display means is rotated around the origin and displayed. It is possible to display the actual geographical direction and the direction of the map displayed on the screen in correspondence with each other regardless of the change in the direction in which the device is facing. Become.

[Brief description of drawings]

FIG. 1 is a diagram showing an external configuration of a map information display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a configuration of a direction detection optical encoder incorporated in the map information display device.

FIG. 3 is a diagram showing a positional relationship between rotation detection slits of a slit disk and slits for A phase and B phase respectively in the map information display device.

FIG. 4 is a block diagram showing a configuration of an electronic circuit of the map information display device.

FIG. 5 is a diagram showing a relationship between a detection signal from each of the A-phase and B-phase photosensors of the map information display device and a binarized signal from each light receiving circuit.

FIG. 6 is a diagram showing a change state of an image data (map) display area according to a change in the direction of the device body in the map information display device.

[Explanation of symbols]

11 ... Device main body, 12 ... Display unit (LCD), 13 ... Slit disk, 13a ... Rotation detecting slit, 13b ...
N pole detection slit, 14 ... compass, 15 ... central axis,
16 ... Rotation detecting A phase mask plate, 16a ... A phase slit, 17 ... Rotation detecting B phase mask plate, 17a ... B phase slit, 18a ... A phase LED, 18b ... B phase LE
D, 19a ... A phase photosensor, 19b ... B phase photosensor, 20 ... N pole detection mask plate, 20a ... N pole slit, 21 ... N pole LED, 22 ... N pole photosensor, 23a ... A-phase light receiving circuit, 23b ... B-phase light receiving circuit,
23c ... Light receiving circuit N, 24 ... Flip-flop circuit, 2
5 ... Up-down counter, 26 ... Direction calculation circuit, 27
... image data file, 28 ... address generation circuit, 29
... Coordinate conversion circuit, 30 ... Image memory, 31 ... Display drive circuit, 32 ... Map image data, 32a ... Map display area facing north of device body 32b ... Map display area facing (φ) from west of device body.

Claims (2)

[Claims] 1. Storage means for storing map data according to a preset reference azimuth, and address generation means for instructing the map data stored in this storage means by a polar coordinate address having its center as an origin. Display means for displaying the map data read from the storage means in accordance with the polar coordinate address designated by the address generating means, azimuth detecting means for detecting the azimuth of the apparatus body, and azimuth detecting means An azimuth deviation detecting means for detecting a deviation angle of the azimuth of the apparatus main body from the reference azimuth, and a polar coordinate address designated by the address generating means according to the deviation angle from the reference azimuth obtained by the azimuth deviation detecting means. Display control means for rotating and displaying the map data corrected and displayed by the display means about its origin. Map information display device, characterized in that. 2. The map information display according to claim 1, wherein the display control means converts the map data corresponding to the polar coordinate address corrected according to the deviation angle from the reference azimuth into an orthogonal coordinate address for display. apparatus.