JP2597752B2 - Display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention is to utilize an afterimage effect in eyes. The present invention relates to a scan-type display device in which a display content can be read by an observer moving at a high speed, and a large image can be displayed with a small number of display elements.

<Conventional technology> Conventionally, a scan type display device is disclosed in Japanese Patent Application No.
63-219951 (Japanese Unexamined Patent Application Publication No. 2-89089), "Scanning Advertising Tower Device", and Japanese Patent Application No. 1-35844 (Japanese Unexamined Patent Application Publication No. 2-213)
No. 892) is known as a "display device".

The former type of advertising billboard device describes a pass-type display device which is a display system that uses the movement of a train or the like as one of the scans, and the latter type of display device describes a rotary display device.

<Problems to be Solved by the Invention> However, in the related art, there is an unsolved problem that the image is turned over when the passing direction is reversed.

Also, a system that makes it possible to see things that were not visible from both the up lane and the down lane on trains, etc.
Even if the above problem is solved, even in such a system, there is a problem that the time series of the video is reversed in the case of a video with a story.

Therefore, the following two points can be considered as problems to be solved. In the case of the conventional method, when viewed from a passing train in the opposite direction, 1) the image is turned upside down (mirror image).

2) The time series is reversed.

It is in the point.

Therefore, an object of the present invention is to provide a pass-type display system that can provide a correct display even when viewed from either the up lane or the down lane, and that does not reverse the time series of the story.

<Means for Solving the Problems> According to the present invention, a plurality of display devices for solving the above problems are provided on a path of a moving object for observation, and display of L × M pixels is performed by switching a display surface of L × N pixels. In a scan type display device (N <M) for obtaining a screen, a row address counter is counted up in a manner that implies passage of an observation moving body coming from a direction opposite to the observation moving body, and when a carry is output, a column address counter is increased. One is a means for detecting in the form of being incremented by one and a means for switching the address of the storage means based on the traveling direction of the observation moving body. Similarly, for time series inversion,
Block address switching means is provided.

<Operation> As described above, when the observation moving body in the opposite direction passes, the detection unit detects the passage, and notifies the host station of the passing speed and the passing timing. As a result, the host station notifies each unit that the display is for the observation mobile unit in the opposite direction, and the mode of each unit is switched. Then, according to the passing speed and the display timing of the observation moving object transmitted from the host station, the display is started from the display unit having the larger unit number which is opposite to the normal one.

<Embodiment> Normally, as shown in FIG. 1, the scanning type display device is configured such that each unit 12 of the display device is connected to the observation mobile object 11 by a communication cable 13 in any manner, and the host station 14 Connected to the LAN. At this time, for example, when the observation mobile unit 11 located on the up lane side is located on the down lane side, the detection unit 16 for the observation mobile unit 15 on the down lane side is connected to the communication cable 13. The observation mobile unit 11 is connected to the host station 14 in the same manner as the observation mobile unit 11 is installed on the up lane side. Of course, when the lane for the up and down lanes is shared by a single line, the sensor unit in the unit can be shared without providing a new detection unit 16.

For the sake of simplicity, a system using two red and green LEDs with a display size of 128 × 128 dots as shown in FIG. 2 will be described as an example. As described above, the display size is such that the data size on the red side (R side) and the data size on the green side (G side) are each 2048 bytes. Since this display device is a column scan type, only one line is displayed at a certain moment. In the case of one line as shown in FIG. 2, 128 dots each for the R and G sides are simultaneously displayed. Scanning is performed while the lighting is controlled. At this time, if each dot gradation display is not performed, and if it is a binary expression, one row occupies the data storage means (memory) of 16 bytes for each RG, and the data amount for one screen is RG. Each requires 2048 bytes, for a total of 4096 bytes of memory. Hereinafter, this is referred to as one block.

Therefore, as shown in FIG. 1, assuming that the display device is located on the left side in the traveling direction of the observation vehicle 11 on the up lane side and on the right side in the traveling direction of the observation vehicle 15 on the down lane side. When the display device is viewed from the observation vehicle 11 on the ascending lane side, the display array unit appears to be relatively shifted in the window on the left side in the traveling direction as shown in FIG. From the opposite direction observation moving body 15, the window on the right side in the traveling direction is shown in FIG.
As shown in FIG. 1, the display array unit appears to move relatively.

 FIG. 3 is a block diagram of the present invention.

The addresses in the column are row addresses A0 ... A3, the column addresses are column addresses A4 ... A10 ..., the switching address for switching between the R side and the G side is A11, and the block address is A12.
.., A16 constitutes a row address counter 31, a column address counter 32, and an R / G switching counter 33. These may be provided separately as different counters on the hardware, but the row address counter 31 is counted up in any way,
When the carry is output, the column address counter 32 counts up by one.

Therefore, on the hardware, one 12-bit counter may be referred to as described above.

In the block address latch 34, a block address B12... B16 is directly set by a microprocessor (CPU) 36, and the block address A12. A10 is added to each of the address lines A4 to A10 by an exclusive OR gate 35, and is controlled by a control signal DIR from the CPU 36.

Reference numeral 37 denotes a memory serving as display data storage means.

As is well known, when DIR = 0, the output OUT is the input data d itself, and when DIR = 1, the EXOR operation is the inverse of d when DIR = 1. Therefore, DIR =
When 1, the one's complement A4 '... A10' of the column address A4 ... A10
(FIG. 5).

Then, even though the column address counter 32 counts up the address as usual, the operation is that the complements A4 '... A10' are counted down one by one from the last address of the column address. Since the image is a mirror image, it can be displayed as a regular display when viewed from the observation moving object 15 in the opposite direction.

When the observation mobile in the opposite direction passes, the host station transmits the arrival of the mobile in the opposite direction from the data received by the detection unit 16 to each unit, and each unit switches the DIR signal according to this, By scanning the mirror image data, a regular image can be observed from the observation movable body.

In the case where the same screen such as a still image is repeatedly displayed, it is sufficient to mirror the data of the individual display units. However, in the case of an animation or the like that changes in a time series, the data is reversed. In this reversal, the person runs backwards, or the start and end of the story is reversed, and the end of the story comes first. In this case, the display data whose time series is reversed is loaded in advance at a different block address of each unit, and the host station observes each unit in the opposite direction based on the data of the detection unit 16 as described above. By transmitting the arrival of the mobile unit, each unit can switch the DIR signal and change the block address according to this, so that the normal time-series video can be viewed from the mobile unit 15 for observation in the opposite direction. Become.

 A second embodiment of the present invention will be described with reference to FIG.

In the second embodiment, the display array is moved. In particular, in the case of rotation, in this case, as in the first embodiment, when the rotation direction is reversed, the display data is changed. Become a mirror image. However, in this case, since the rotation direction is not frequently switched, it is sufficient to provide a switch for DIR or to write the value of DIR in the software of the CPU for switching. If it is absolutely necessary to switch automatically, two photo interrupters may be provided to detect the rotation direction.

<Effect of the Invention> As described above, according to the present invention, according to this method, not only can the display be performed for the observation mobile in both the up and down directions, but also the scanning of this column can be performed on either the left or right of the observation mobile. Even when the type display device is installed, there is an effect that the DIR can be controlled and operated without modification.

[Brief description of the drawings]

FIG. 1 is a diagram showing the overall configuration of the present invention, FIG. 2 is a diagram showing a moving direction of a display screen and a display array, FIG. 3 is a block diagram, and FIG.
FIG. 5 is a table showing the operation of exclusive OR, and FIG.
FIG. 6 is a diagram showing that the column address is inverted by the complement of FIG. 6, and FIG. 6 is an external view of the second embodiment.

Claims (1)

(57) [Claims] 1. A plurality of L × N units are provided on a path of a moving object for observation.
In a scan-type display device (N <M) that obtains a display screen of L × M pixels by a switching operation of a display surface of a pixel, a low address counter is formed in such a manner that passage of an observation moving object coming from a direction opposite to the observation moving object is performed. The counter is incremented, and when a carry is output, a column address counter is incremented by one, and a means for detecting and a means for switching the address of the storage means based on the traveling direction of the observation movable body are provided. Display device.