JPH08708Y2 - LED display device - Google Patents

Description

[Detailed description of the device]

[Purpose of Invention]

[0002]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED display device for displaying various control panels, adjusting devices, guide displays, news, etc. in the form of characters or figures using light emitting semiconductor elements, and more particularly to LED dot matrix current control. The present invention relates to a miniaturized LED display device by improving a drive substrate.

[0003]

2. Description of the Related Art Generally, the appearance of a small LED display device is shown in FIG.
In such a state, the display surface of the LED dot matrix (1) occupies most of the surface area, and the LED dot matrix (1) is arranged in the lateral direction without any gap. A substrate used in an LED display device having such a structure has an LED dot matrix current control drive circuit as shown in FIGS. 3 (a), 3 (b) and 3 (c), which is formed on one printed wiring board (2a). And are arranged at right angles to the LED dot matrix (1). Therefore, when the column side connector (4) and the row side connector (5) of the LED dot matrix are arranged separately in the vertical direction, both connectors (4) between the boards,
The other connector, which cannot be directly connected to the board in (5), has means for extending the cable (3) or the like and connecting it to the current control drive circuit (2). In these conventional configuration means, the wiring path from the current control drive circuit (2) to the LED dot matrix (1) becomes long, and the circuit impedance increases, so that the flicker on the display screen is eliminated. It has a defect that the current control drive circuit including the dot matrix (1) cannot operate at high speed.

[0004]

In the conventional board structure, the depth dimension of the printed wiring board becomes long, and thus the wiring path between the drive element for connecting and disconnecting the LED lighting current and the LED dot matrix is long and the circuit impedance is large. This leads to an increase in the number and has a drawback that the operation of intermittently scanning the LED lighting current, which is a feature of the dynamic lighting circuit, cannot be performed at high speed.

The object of the present invention is to provide a compact LED as described above.
Regarding a circuit board for controlling and driving the LED lighting current of a dot matrix, the LED display device is miniaturized by shortening the wiring path between the LED dot matrix and the drive element and reducing the depth dimension of the printed wiring board of this circuit. To provide.

[Constitution of device]

[0007]

In order to achieve the above object, in the present invention, a substrate having a circuit for controlling and driving a lighting current to an LED dot matrix in an LED display device is box-shaped, three-dimensionally assembled, It is characterized by being made compact.

[0008]

According to the present invention, the wiring path from the LED dot matrix to the control drive circuit for connecting and disconnecting the lighting current of the LED element is shortened, and the depth dimension of the board having this circuit is less than half of the conventional one. You can

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in FIGS. 1 and 2 will be described below. Incidentally, the same reference numerals as those in the conventional example of FIG. 3 have the same structure, and the description thereof will be omitted.

The current control drive circuit for the LED dot matrix (1) is, as shown in FIG. 2, a portion of the column side data control circuit, that is, the column data control circuit board (9) and the horizontal direction. A scan circuit portion for scanning the row side, that is, a row scan circuit substrate (10) and an input / output buffer circuit substrate (11) for distributing a display control signal to these two types of substrates are roughly divided into circuits. Paying attention to the point, the circuit in this portion was divided into three printed wiring boards. As shown in FIG. 1, these three types of substrates are connected by the column side connector (4) and the row side connector (5) of the part connected to the LED dot matrix (1), and display control signals from the input / output buffer circuit board. The column data / control signal connector (13) and the row scan control signal connector (14) that are distributed and connected to the other two types of substrates are all connected and assembled without a cable or the like to form a box-shaped structure. .

As a result, the wiring path to the LED dot matrix can be shortened, and at the same time, the depth dimension of these substrates can be reduced to less than half of the conventional structure.

[0012]

As described above, according to the present invention, L
The wiring path of the substrate on which the circuit for controlling the current for lighting the ED dot matrix is mounted can be shortened, and the circuit can operate at high speed. Further, since the depth dimension of the combined printed wiring board is reduced, the LED display device using this circuit board can be downsized.

[Brief description of drawings]

1A and 1B are views showing an embodiment of an LED display device of the present invention, in which FIG. 1A is a front view, FIG. 1B is a top view, and FIG.
Is a rear view and (d) is a side view.

FIG. 2 is a system diagram showing the connection configuration of FIG.

FIG. 3 is a view showing a structure of a conventional LED dot matrix and a current drive substrate, (a) is a front view,
(B) is a top view and (c) is a side view.

FIG. 4 is a perspective view of an LED display device showing a part common to a conventional example and an embodiment of the present invention.

[Explanation of symbols]

 1 ... LED dot matrix 9 ... Column data control circuit board 10 ... Row scan circuit board 11 ... Input / output buffer circuit board

Claims (1)

[Scope of utility model registration request] 1. An LED display device having a current control drive circuit for driving an LED dot matrix, wherein a column data control circuit board for controlling the current control drive circuit to control data of a column in the vertical direction of the LED dot matrix. And the LE
Three boards: a row scan circuit board for scanning the row side in the horizontal direction of the D dot matrix, and an input / output buffer circuit board for distributing display control signals to the column data control circuit board and the row scan circuit board. The column data control circuit board and the row scan circuit board are directly connected to each other in a direction perpendicular to the LED dot matrix board, and the input / output buffer circuit board is connected to the column data control circuit board. And an LED display device directly connected to the scan circuit board from the back in a direction perpendicular to the scan circuit board.