JPH0820852B2 - LED display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention rotates a LED substrate on which a plurality of LED elements are arranged in a row at a high speed, and at the same time turns on and off the LED elements during rotation, thereby The present invention relates to a display device for displaying images such as figures on a rotation track of an LED board.

(Prior Art) There is a conventional LED flat display element in a display device capable of displaying a character, a figure, etc. by arranging a large number of LED elements in a matrix. This display device has been developed, for example, a monolithic type in which matrix-shaped light emitting points are formed on the same substrate crystal and a hybrid type in which independent LED chips are arranged in a matrix on different types of assembled substrates.

The monolithic type has already been applied to various display devices for vehicles and the like, and the hybrid type has practical resolution, so that it is expected to be put to practical use for television image display in the future.

(Problems to be Solved by the Invention) The above-mentioned LED flat display element is an assembly of semiconductors,
It is very expensive at present due to the high manufacturing technology required.

Further, even if the display device is configured by using an inexpensive LED element as a substitute for the LED flat display element, in order to display characters and figures, a large number of LED elements must be arranged in a matrix, so that the cost is low. Up is inevitable.

The present invention has been made in view of the above problems, and an object thereof is to provide an LED display device capable of displaying characters and figures by using a smaller number of LED elements, and further capable of displaying a moving image. To do.

(Means for Solving the Problems) In order to achieve this object, the present invention has a plurality of LED elements arranged in a row and rotatably supported by a stepping motor.
LED board, rotation angle control information for controlling the rotation angle of the LED board, an input device for designating position information for selecting and lighting a desired LED element among the plurality of LED elements, and the rotation angle control information Based on the above, a microcomputer for controlling a stepping motor for rotating the LED substrate and controlling lighting of the LED element based on position information synchronized with each rotation angle is additionally provided.

(Operation) According to the LED display device of the present invention, since the LED substrate is rotationally driven by the stepping motor, the microcomputer maintains the rotational speed at which an optimal afterimage phenomenon effect is obtained and also controls the rotational angle of the LED substrate. Control information and L
The rotation of the LED board can be controlled for each rotation according to the ED lighting information.

(Example) Hereinafter, an example of the present invention is described based on a drawing.

1 to 4 show the configuration of an embodiment of the present invention. FIG. 1 is a block diagram of an LED display device, FIG. 2 is a top view of an LED substrate, and FIG. 3 is for specifying an input position. FIG. 4 is a diagram showing a display example.

In FIG. 1, reference numeral 10 is a base, and an LED substrate 12 rotatably supported is provided on the base 10. This LED
The substrate 12 is formed into a substantially rectangular parallelepiped and has a plurality of LEDs on the top surface.
The elements 14 are arranged in a row. Further, an LED driving chip IC 12a is embedded under the LED substrate 12, and its signal output lead is wired to the lead of each LED element 14.

Further, the central portion of the LED substrate 12 is rotatably supported by a rotary shaft 18 having a stepping motor 16 as a drive source, and is rotated at a high speed in an arbitrary direction.

The LED elements 14 arranged in a row on the LED substrate 12 are of a high-speed response type, for example, elements having characteristics equivalent to those of a light emitting diode for optical communication conventionally used as a light source for optical communication using an optical fiber are adopted. It Then, the LED element is covered with a color cap as required.

20 is a rotary transformer, which is supported by the rotary shaft 18
A rotor 20a that rotates together with the stator 18, a stator 20b fixed to the apparatus in a stationary state, and the rotor 20a and the stator.
It consists of a coil 20c wound around each ferrite core of 20b.
Connect to the 0a side. The signal output induced on the rotor 20a side is passed through the lead wire inserted inside the rotary shaft 18.
It is sent to the LED driving IC 12a.

Reference numeral 22 denotes a coupler, which is a coupler that supplies the power supply 24 to the LED driving IC 12a through the rotary shaft 18. The coupler 22 is composed of, for example, a pair of brushes, and positive and negative power supplies are supplied through the brushes.

Next, reference numeral 26 denotes a microcomputer, which stores information about various characters and figures input from the input device 28, and a storage unit.
The operation is performed based on the ROM information of 30 and the rotation angle control information for rotationally driving the stepping motor 16 at a predetermined timing, and a desired LED element among the plurality of LED elements 14 is selected to drive the motor.
Position control information that sequentially lights in synchronization with 16 rotation timings is output.

The control information output to the stepping motor 16 is sent to the motor drive circuit 34 for power amplification through the parallel interface circuit 32. Meanwhile, a microcomputer
The LED position control information output from 26 is the signal amplification circuit 3
Amplified by 6, this output signal is given to the stator 20b of the rotary transformer 20.

Next, the operation of the embodiment configured as described above will be described.

When the LED element 14 of the rotating LED board 12 is turned on and off to display characters and figures, the information stored in the ROM of the storage unit 30 in advance can be read and displayed. It is also possible to perform input by operating the keys of the input device 28 based on the chart shown in FIG.

Chart Figure 38 shows the rotation angle 38a of the LED board 12 and the LED board 1
The number 38b indicating the position of the LED elements 14 arranged in line in 2 is displayed, and the desired lighting position of the rotating LED element 14 is obtained from the intersection of the rotation angle 38a and the LED position 38b. For example, FIG. The information on the lighting position is input as in the display example. This position information is input by key operation and is stored in the RAM of the storage unit 30.
Once stored in, then read and displayed.

Each phase of the stepping motor 16 is sequentially excited on the basis of the program information, and is rotated 360 degrees by, for example, 360 pulse trains.

Similarly, the LED drive signal as position information output from the microcomputer 26 is input to the rotary transformer 20 via the amplifier 36, and is further sent to the LED drive IC 12a. As a result, the selected LED element among the plurality of rotating LED elements 14 is momentarily turned on in synchronization with the rotation of the stepping motor 16 based on the program information.

When the afterimage phenomenon is utilized by rotating the LED substrate 12, the relationship between the lighting time of the LED element 14 and the rotation speed is a very important factor. First, there is a rotation speed at which an optimum afterimage effect can be obtained. This depends on what kind of character, figure, etc. you draw.
2 is rotationally driven by a stepping motor 16. Further, rotation angle control control information for controlling the rotation angle of the LED substrate 12 and position information for selectively lighting the plurality of LED elements 14 are input to the input device. For this reason, the microcomputer 26 uses the input rotation angle control information for the LED
The rotation of the substrate 12 can be controlled for each rotation.

Therefore, the LED substrate 12 can be kept at the rotation speed that can obtain the optimum afterimage effect, and the LED lighting information is rotated even during one rotation, as shown in FIG. 4 (b), for example. By controlling so that the rotation speed is slowed in the area b which is not continuous in the direction, and is increased in the area q where the LED lighting information is continuous in the rotation direction, the image of characters, figures, etc. becomes clear. Can be displayed.

When the information stored in the ROM of the storage unit 30 is read, if the position is sequentially moved in an arbitrary direction, the displayed graphic can be given a motion. Also ROM
It is also possible to express a sentence by sequentially reading out and displaying a plurality of character information stored in.

It should be noted that the present invention is not limited to the above-described embodiments, and various modifications are included.

For example, the LED elements 14 arranged in a row on the LED substrate 12 are GaP type LEDs.
It is possible to add color display by adopting multi-color such as elements and switching the emission color of multi-color LED elements.

Further, in the embodiment shown in FIG. 2, the plurality of LED elements 14 are arranged in one row, but the same color effect can be obtained by arranging a plurality of LED elements having different emission colors in the rows. .

Furthermore, the LED substrate having a plurality of LED elements arranged in a row is not limited to be formed in a linear shape, and may be formed in a cross shape, for example.

(Effect) As described above, according to the LED display device of the present invention, the input device includes the rotation angle control information for controlling the rotation angle of the LED substrate and the position information for selectively lighting the plurality of LED elements. Is input, and the LED board is driven to rotate by a stepping motor. Therefore, the microcomputer can control the rotation of the LED substrate for each rotation according to the input rotation angle control information. Therefore LE
The D board is kept at a rotation speed that provides an optimal afterimage effect, and the rotation speed is slowed down when the LED lighting information is not continuous in the rotation direction during one rotation. By controlling so that the rotation speed is increased in a continuous place, it is possible to clearly display images such as characters and figures.

Further, since the present invention can suppress the power consumption of the device to an extremely low level, it is expected that the present invention can be applied to portable devices.

[Brief description of drawings]

1 to 4 are configuration diagrams of an embodiment of the present invention. FIG. 1 is a block diagram of an LED display device, FIG. 2 is a top view of an LED substrate, and FIG. FIG. 4 is an example of display by the display device. Reference numeral 12 ... LED display substrate, 14 ... LED element, 26 ... Microcomputer, 28 ... Input device

Claims (1)

[Claims] 1. An LED substrate having a plurality of LED elements arranged in a row and rotatably supported by a stepping motor, rotation angle control information for controlling a rotation angle of the LED substrate, and a desired LED among the plurality of LED elements. An input device that specifies position information for selecting and lighting an element, and a stepping motor that rotates the LED board based on the rotation angle control information, and position information that is synchronized with each rotation angle
An LED display device characterized by being provided with a microcomputer for controlling lighting of LED elements.