JPH10222103A - Image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large-sized image display device capable of displaying a large-sized image. SOLUTION: A moving body 2 in which plural light emitting trains N1-Nn in which plural light emitting elements 1 are aligned are arranged is made to be rotated. This device is provided with a serial converting circuit 34 converting image data stored in an image memory 28 into a serial signal. Moreover, an image is displayed by controlling light emissions of light emitting elements 1 while providing shift registers S1-Sn made to correspond to plural light emitting elements 1 every light emitting train N1-Nn and providing shift registered DS1-DSn-1 for delay delaying the serial signal by the amount equivalent to the deviation value among light emitting element trains in among light emitting element trains N1-Nn. Furthermore, a scrolling is made possibly by providing a delay amount adjusting circuit 38 adjusting delay amounts of the shift registers DS1-DSn-1 for delay.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image display device for displaying an image of a character, a numeral, a figure, or the like by emitting light from a light emitting element.

[0002]

2. Description of the Related Art Conventionally, there has been known an image display apparatus which displays an image in space by utilizing the afterimage phenomenon of the human eye.
In such an image display device, for example, Japanese Patent Application Laid-Open No. 4-65
As disclosed in Japanese Patent Publication No. 86, a plurality of light-emitting arrays in which a plurality of light-emitting elements are arranged in a direction substantially perpendicular to the moving direction are provided on the surface of a rotating belt, and the light-emitting elements blink according to the amount of movement of the belt. , So as to reproduce and display an image in space.

The light-emitting element converts image data stored in advance into a serial signal, transmits the serial signal to a shift register, reads the image data stored in the shift register in accordance with the amount of movement of the belt, and blinks the image data. Was like that.

[0004]

However, in such a conventional device, when the number of light emitting columns increases due to an increase in the size of the device, it is necessary to increase the transfer speed of the serial signal. For example, when the number of light emitting columns is 16, the vertical resolution is 240 dots, the horizontal resolution is 640 dots, and the rotation speed of the belt is 4 rotations / second, the transfer rate of the serial signal per second is as follows. Become.

The number of rotations × the number of pixels × the number of light emitting columns = 4 × 240
× 640 × 16 = 9.83 Mbit Further, when performing two-color and three-color display, the display becomes twice or three times as large as this, and when luminance modulation is performed for each dot by pulse width modulation, A transfer rate exceeding 100 Mbps is required, and there is a problem that the numerical value is difficult to realize.

An object of the present invention is to provide a large-sized image display device capable of displaying a large image.

[0007]

In order to achieve the above object, the present invention takes the following means to solve the problem. That is, while rotating a moving body in which a plurality of light emitting rows in which a plurality of light emitting elements are arranged are arranged, image data stored in a storage unit is converted into a serial signal and transmitted, and the light emitting elements emit light to display an image. In the image display device, a shift register corresponding to the plurality of light emitting elements is provided for each of the light emitting columns, and a delay shift register for delaying a serial signal by a shift between the light emitting columns is provided between the light emitting columns. The image display device is characterized by the following.

Further, a delay amount adjusting circuit for adjusting the delay amount of the delay shift register may be provided.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. As shown in FIG. 1, reference numeral 1 denotes a light-emitting element, and a light-emitting diode or the like is used as the light-emitting element 1. A plurality of P light-emitting elements 1 are vertically arranged on the surface of a moving body 2 to emit light N1 to N1. Nn are arranged in a plurality of n rows (16 rows in the present embodiment) at regular intervals.

The moving body 2 is connected to a rotation shaft 6 of a motor 4, and the plurality of light emitting elements 1 are arranged in parallel with the rotation center of the rotation shaft 6. Further, a detection plate 10 that is rotated by the rotating shaft 6 is provided, and a position sensor 12 that detects a slit formed in the detection plate 10 and outputs a signal corresponding to the rotation angle is provided. The moving body 2 is not limited to a rotating body, but may be a linearly reciprocating one. In such a case, the position sensor outputs a signal corresponding to a linear displacement of the moving body. I just need.

The moving body 2 is provided with a rotary connector 14 for exchanging signals between the light emitting element 1 and the outside of the moving body 2 coaxially with the center of rotation of the moving body 2. And those using a rotary transformer, a brush, or a mercury contact are known.

Further, as shown in FIG. 2, the light emitting element 1, the motor 4, and the position sensor 12 are connected to an electronic control circuit 20. The electronic control circuit 20 includes a well-known CPU 22 and an RO.
M24, RAM 26, image memory 28 as storage means
Are arranged at the center of a logical operation circuit, and an input / output circuit 30 for performing input / output with the outside is mutually connected via a common bus 32.

The CPU 22 receives signals from the position sensor 12 through an input / output circuit 30, and based on these signals, the recording in the ROM 24, the RAM 26, and the image memory 28, and a control program stored in advance.
Reference numeral 2 denotes an input / output circuit 30 for the light emitting element 1, a serial conversion circuit 34 for converting image data read from the image memory 28 into a serial signal, and the rotary connector 14, and an input / output circuit 30 for the motor 4 The driving signal is output via the circuit 36.

On the other hand, the light emitting columns N1 to Nn are
, Shift registers S1 to Sn are provided, and each bit of each shift register S1 to Sn corresponds to each light emitting element 1. The serial signal supplied via the rotary connector 14 is stored, and the light emission of each light emitting element 1 is controlled based on the contents of each shift register S1 to Sn.

Further, delay shift registers DS1 to DSn-1 are provided between the respective shift registers S1 to Sn, and the delay shift registers DS1 to DSn-1 delay the serial signal by a shift between columns. It is. In the present embodiment, as shown in FIG. 3, the light-emitting column N2 is
, There are S dots whose light emission is controlled at a distance a, and each of the light emitting columns N1 to Nn has P light emitting elements 1
In this case, the delay shift registers DS1 to DSn-1 have the number of bits to be delayed by a shift between columns (= S.times.P bits).

Further, each of the delay shift registers DS1 to DS
A delay amount adjusting circuit 38 is connected to Sn-1 and the delay amount adjusting circuit 38 is connected to each of the delay shift registers DS1 to DS.
A 1-bit or P-bit serial signal is output to Sn-1 to shift the data in each of the delay shift registers DS1 to DSn-1 by 1 bit or P bits.

Next, the operation of the image display device of the present embodiment will be described. First, when the motor 4 is driven to rotate via the motor drive circuit 36, the moving body 2 starts rotating. Then, the rotation angle is detected by the position sensor 12, and image data corresponding to the rotation angle is read from the image memory. Then, the image data is input to the input / output circuit 3.
The signal is sent to the serial conversion circuit 34 via the “0”, and the serial conversion circuit 34 converts the signal into a serial signal.

Each time the moving body 2 rotates by an angle corresponding to the distance a, the CPU 22 reads one row of image data of the light emitting rows N1 to Nn from the image memory 28 and sends it to the serial conversion circuit 34. The serial conversion circuit 34 converts the image data into P
Bit serial signal, and the rotary connector 1
4 and supplied into the moving body 2. The serial signals are transmitted via the rotary connector 14 to the shift registers S1 to Sn and the delay shift registers DS1 to DSn-1 in the mobile unit 2.
Supplied to and stored in

The delay shift register DS1 stores the newly supplied P-bit serial signal, and converts the first P-bit signal into the next delay shift register DS2.
Send to The same applies to each delay shift register D
The processing is performed sequentially from S2 to DSn-1.

On the other hand, in the shift register S1, the CPU 2
2 stores the P-bit serial signal newly supplied. The next shift register S2 stores a P-bit serial signal sent from the delay shift register DS1 to the next delay shift register DS2.

That is, the next shift register S2 has a delay shift register DS1 which is longer than the previous shift register S1.
Is shifted by an amount corresponding to the image data stored in the. This is sequentially performed in the following shift registers S2 to Sn. Therefore, in each of the shift registers S1 to Sn,
Data delayed by the amount of shift (= S × P bits) between columns stored in the delay shift registers DS1 to DSn-1 is stored.

Then, the light emission of the light emitting element 1 is controlled based on the image data stored in the shift registers S1 to Sn. When the moving body 2 is further rotated by the distance a and reaches the next light emitting position, the CPU 22 outputs one of the light emitting columns N1 to Nn.
P-bit image data for a column is supplied.

As described above, the delay shift register DS1 stores a new P-bit serial signal and sends the first P-bit signal to the next delay shift register DS2. Are sequentially performed by the delay shift registers DS2 to DSn-1. The shift register S1 stores a new P-bit serial signal,
In the next shift register S2, a delay shift register D
The P-bit serial signal from S1 is stored.

Therefore, every time the mobile unit 2 rotates to the next light emitting position, the electronic control circuit 20 supplies a P-bit serial signal of one of the light emitting columns N1 to Nn, and the light emitting columns N1 to Nn. Nn, each delay shift register DS1
To DSn-1 (= S × P)
The light emission is controlled by the image data delayed by (bit), and an image is displayed.

That is, when the moving body 2 rotates by the distance a × S, the next light emitting column N 2 reaches the light emitting position of the previous light emitting column N 1. At this time, the image data (P bits) of the previous light emitting column N1 is the same as the image data (P bits) of the next light emitting column N2. Therefore, every time the moving body 2 rotates by the distance a, the electronic control circuit 20 sets the P for one of the light emitting columns N1 to Nn.
An image can be displayed by supplying a bit serial signal. Therefore, the transfer rate of image data can be reduced, and a large image can be displayed on a large-sized device.
If there are 16 columns, delay shift registers DS1 to DS1 to D
The transfer rate can be reduced to 1/16 of that without Sn-1.

On the other hand, when a one-bit signal is supplied from the delay amount adjusting circuit 38 to each of the delay shift registers DS1 to DSn-1, the display image for one line is scrolled upward as shown in FIG. I do. Each delay shift register D
When one bit signal is reduced from S1 to DSn-1, the display image for one line is scrolled down.

When a P-bit signal of one of the light emission columns N1 to Nn is supplied from the delay amount adjustment circuit 38 to each of the delay shift registers DS1 to DSn-1, as shown in FIG. The display image for one column is scrolled to the right. When one column of P-bit signals is reduced from each of the delay shift registers DS1 to DSn-1, the display image for one column is scrolled to the left.

As described above, the delay shift register DS1
ＤＳDSn-1 and the delay amount adjusting circuit 38, the electronic control circuit 20 can easily scroll the image with a small amount of image data. As described above, the present invention is not limited to such embodiments at all, and can be implemented in various modes without departing from the gist of the present invention.

[0029]

As described in detail above, the image display device of the present invention has an effect that the transfer rate of image data can be reduced and a large image can be displayed on a large device. Further, by providing the delay amount adjusting circuit, scrolling can be performed with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an image display device as one embodiment of the present invention.

FIG. 2 is a circuit diagram showing a configuration of an electric system of the image display device according to the embodiment.

FIG. 3 is an explanatory diagram of a light emitting column and a light emitting position according to the embodiment.

FIG. 4 is an explanatory diagram of a scroll according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Light-emitting element 2 ... Moving body 12 ... Position sensor 14 ... Rotary connector 20 ... Electronic control circuit 28 ... Image memory 34 ... Serial conversion circuit 38 ... Delay amount adjustment circuit DS1-DSn-1 ... Delay shift register S1-Sn ... Shift register

Claims (2)

[Claims] 1. A moving body in which a plurality of light-emitting arrays in which a plurality of light-emitting elements are arranged is rotated, and image data stored in a storage unit is converted into a serial signal and transmitted, so that the light-emitting elements emit light. In an image display device for displaying an image, a shift register corresponding to the plurality of light emitting elements is provided for each of the light emitting columns, and a delay shift register for delaying a serial signal between the light emitting columns by a shift between the light emitting columns. An image display device, comprising: 2. The image display device according to claim 1, further comprising a delay amount adjusting circuit for adjusting the delay amount of the delay shift register.