JP2668502B2 - LED display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dot matrix type LED display device for forming a large LED display device.

[0002]

2. Description of the Related Art Conventionally, such a dot matrix type LED display device is configured as shown in FIGS. 8 and 9, the dot matrix type LED display device 1 is a static drive type LED display device, in which light emitting dots 3 are arranged in a dot matrix form on an upright display panel 2, and each row of the dots is arranged. A plurality of LED mounting drive control circuit boards 5 having LEDs or LED lamps 4 constituting each light emitting dot at a front edge provided for each light emitting dot, and each LED mounting drive control in parallel with the display panel 2. And a motherboard 6 mounted with a power supply circuit and the like mounted behind the circuit board 5.

Here, the LED mounting drive control circuit board 5 is disposed vertically with respect to the display panel 2 in consideration of heat radiation.

In the dot matrix type LED display device 1 configured as described above, each LED mounting drive control circuit board 5 controls each light emitting dot 3 based on display data.
A desired light emitting display pattern is displayed by sequentially controlling the drive of the LEDs or the LED lamps 4 that compose the.

[0005]

However, in the LED display device 1 having such a configuration, since the LED mounting drive control circuit board 5 is placed vertically, the data transmission direction of the display device 1 is set to the vertical direction. Become. For this reason, for example, when light emission display is performed based on horizontal scan data such as a video signal, it is necessary to switch the input display data from the horizontal direction to the vertical direction. For example, it is configured on the motherboard 6 or provided separately. Therefore, there is a problem that the number of components is increased, a space for incorporating this circuit is required, and the entire display device is enlarged.

In view of the above, the present invention provides a dot matrix type L of a static drive system capable of displaying horizontal scan data with a simple configuration.
It is intended to provide an ED display device.

[0007]

In order to achieve the above object, the present invention provides a display panel in which light emitting dots are arranged in a dot matrix at right angles to an upright display panel. Horizontal scan data to be input in an LED display device including an LED mounting drive control circuit board having LEDs or LED lamps provided for each light emitting dot in the vertical direction and forming each light emitting dot at the front edge. On the other hand, the synchronization signal generated for each line is serial-parallel converted and shifted by the clock signal into a synchronization pulse, and the logical product of this synchronization pulse and the clock signal is used as the clock signal of the data shift register. To capture 1 bit of data, input it to each LED mounting drive control circuit board, and repeat this operation Ri has a configuration to emit the luminous dots by a latch signal.

[0008]

According to the above structure, since the LED mounting drive control circuit boards are vertically arranged, a space extending vertically and having an open top is defined between the LED mounting drive control circuit boards. Is made. Therefore, the heat generated from the LED, the LED lamp, the IC, and the like mounted on each LED mounting drive control circuit board rises by natural convection and dissipates to the outside, so that the heat dissipation of the LED display device is improved. By processing only the clock signal that determines the data capture timing for each LED mounting drive control circuit board, the horizontal scan data is input as it is, so there is no need to replace the display data with the vertical scan data. . Therefore, a circuit for exchanging data is unnecessary, and a desired display pattern is displayed by light emission with a relatively simple configuration.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the embodiments shown in the drawings. 1 to 4 show L according to the present invention.
1 shows an embodiment of an ED display device. In the LED display device 10, the light emitting dots 12 are arranged in a dot matrix of 16 × 16 in the case of an upright display panel 11 in the illustrated case, and the light emission of one row is performed at right angles to the display panel 11. A plurality of, in the illustrated case, 16 LED mounting drive control circuit boards 14 (14a, 14b,... 14p) having LEDs or LED lamps 13 constituting each light emitting dot at the leading edge provided for each dot. ) And each LED
Control circuit 1 for controlling the mounting drive control circuit board 14
5 is included.

Each LED mounting drive control circuit board 14
A driver 16 (16a, 16a) for driving the ED 13
b, ..., 16p) and the data shift register 17 (17a, 17b, ...,) connected to the driver 16.
17p).

A latch signal, a clock signal, and a display data signal are input to each data shift register 17,
Driver 1 with a signal for driving the associated LED 13
6 is output.

The control circuit 15 is provided with a latch signal LATC.
H, the display data signal DATA, the clock signal CLK, and the synchronization signals STA, STB are input via the buffer 15a, of which the latch signal LATCH and the display data signal DATA are supplied to the respective data shift registers 17a, 17a.
b,..., 17p as they are, and output via another buffer 15b to the next similarly configured LED display device.

The clock signal CLK is supplied to each data shift register 17 via an inverter 15c.
, 18p connected to the clock input terminals of a, 17b,..., 17p, and inputted to one of the input terminals of the AND gates 18a, 18b,.
Input to the clock input terminal of the buffer 15
Via b, it is output to the next LED display device having the same configuration.

The synchronizing signal STA among the synchronizing signals STA and STB is input to the shift register 15d. Further, the synchronization signal STB is input to the shift register 15d, and is also output to the next similarly configured LED display device via the buffer 15b.

Further, the output terminals Q0, Q1, ..., Q15 of the shift register 15d are connected to the other input terminals of the AND gates 18a, 18b ,. The output signal of
The signal is output as a synchronization signal STA to the next similarly configured LED display device via the buffer 15b.

The embodiment of the present invention is constructed as described above. For example, when a large-sized display device is constructed, FIG.
As shown in (1), a plurality of LED display devices 10 are arranged vertically and horizontally (X in the horizontal direction in the figure), thereby forming one large display device 20 as a whole.

Then, a row of Ls arranged in the horizontal direction in FIG.
Regarding the ED display device, the input terminal and the output terminal of the control circuit 15 of the LED display devices 10 adjacent to each other are as shown in FIG.
As shown in FIG.

In the large-sized display device 20 configured as described above, each signal, that is, the latch signal LATCH, the display data signal DATA, the clock signal CLK, and the synchronization signal is supplied to the LED display device 10 shown at the left end in FIG. Signal ST
A and STB are input.

Here, the latch signal LATCH is a latch signal for display data.

The display data signal DATA is a display signal for controlling light emission of each LED of the LED display device 10. In the case of monochrome display, it is a 1-bit signal for turning on and off, but in the case of performing gradation display. The number of bits can be appropriately increased, and the dot matrix formed by the LEDs formed by the entire large display device 20 is configured as raster scan data that is scanned horizontally from the upper left in the drawing.

Further, the synchronizing signal STA is transmitted to the shift register 1
It is shift data for 5d and clock signal CLK
Is shifted by

Further, the synchronization signal STB is an enable signal for the shift register 15d, and is shifted by the clock signal CLK when it is at the H level. That is,
When the LED display device 10 is used in a plurality of stages in the vertical direction, it is used as a control signal thereof.

The timing of each signal is, as shown in FIG. 5, for each data signal relating to one vertical line,
First, the synchronization signal STA is input as a pulse signal. On the other hand, the synchronization signal STB is
The number of lines in the horizontal direction of the D display device 10, 1 in the illustrated case.
It is turned on only for the data time of line 6 (see FIG. 6). And in the case shown, this line is
There are N lines (N = X × 16).

Here, the synchronization signal STB is sequentially inputted to each column by the number X arranged in the horizontal direction of the LED display device 10 of the large display device 20 in FIG.
In the illustrated case, the sync signal STB1 is input to the LED display device 10 in the leftmost column, and the sync signal STB2 is input to the LED display device 10 in the second column. (See FIG. 6).

Therefore, the synchronizing signal STB indicates that the display data signal DATA is the 16th of the LED display device 10 of the column.
It should only be turned on when scanning a line.

FIG. 7 shows the synchronizing signals STA and STB, the clock signal CLK and each data shift register 17a, 1
7b, ..., 17p are shown in relation to the clock signal input to them. That is, one row of LED display devices 10
, The clock signal supplied to the clock input terminal of each data shift register 17a, 17b, ..., 17p is the clock signal CLK and each output terminal Q0 of the shift register 15d. It becomes a product of the output signals from Q1, ..., Q15. Therefore, each data shift register 17a, 17b,
, 17p are sequentially turned on in synchronization with the clock signal CLK. Based on this, the display data signal is supplied to each data shift register at the rising timing of the clock signal. 17a, 17b,..., 17p.

Thus, as the data input to the LED display device 10, the display data signal of the horizontal scan is input as it is, so that the synchronization signal STA generated for each line with respect to the display data signal is transmitted to the shift register 15
The serial / parallel conversion is performed by d, and the data is further shifted by a clock signal and output as a synchronization pulse. Then, the logical product of the output signal from the shift register 15d and the clock signal is calculated by the data shift register 17a, 1
By using clock signals 7b, ..., 17p, the data shift registers 17a, 17b ,.
17p takes in one bit of data, and based on the latch signal LATCH, the drivers 16a, 16b, ...
, 16p, and each LED 13 can emit light appropriately.

In this manner, by inputting the display data signal of the horizontal scan as it is without replacing it with the display data in the vertical direction, the LEs arranged in the vertical direction can be input.
The data can be displayed on the display panel of the LED display device 10 by the data shift register 17 and the driver 16 of each LED mounting drive control circuit board 14 having D.

[0029]

As described above, according to the present invention, since each LED mounting drive control circuit board is vertically disposed, it extends vertically between each LED mounting drive control circuit board. In addition, a space with an open top is defined. Therefore, the LE mounted on each LED mounting drive control circuit board
D, heat generated from an LED lamp, an IC, or the like rises due to natural convection and dissipates to the outside, so that the heat dissipation of the LED display device is improved. By processing only the clock signal that determines the data capture timing for each LED mounting drive control circuit board, the horizontal scan data is input as it is, so there is no need to replace the display data with the vertical scan data. . Therefore, a circuit for exchanging data is unnecessary, and a desired display pattern is displayed by light emission with a relatively simple configuration.
The cost is reduced and the size of the entire device is reduced.

Thus, according to the present invention, there is provided an extremely excellent static drive type dot-matrix LED display device capable of displaying horizontal scan data with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a schematic view showing an embodiment of an LED display device according to the present invention.

FIG. 2 is a block diagram of the LED display device of FIG.

FIG. 3 is a front view showing a large display device in which a plurality of the LED display devices of FIG. 1 are arranged vertically and horizontally.

FIG. 4 is a schematic view showing an LED display device arranged beside the large display device of FIG. 3;

FIG. 5 is a time chart illustrating a relationship between signals input to a data shift register of the LED display device of FIG. 4;

6] STA signal and STB1 of the LED display device of FIG.
FIG. 5 is a time chart showing a relationship between the STB2 signal and the STB2 signal.

FIG. 7 is a time chart illustrating a timing of capturing data in a data shift register of the LED display device of FIG. 4;

FIG. 8 is a schematic front view of a conventional LED display device.

FIG. 9 is a schematic top view of the LED display device of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 LED display device 11 display panel 12 light emitting dot 13 LED or LED lamp 14 LED mounting drive control circuit board 15 control circuit 16 driver 17 data shift register 18 AND gate

Claims (1)

(57) [Claims] 1. An upright display panel is provided for each light emitting dot in a vertical direction at right angles to the display panel so that the light emitting dots are arranged in a dot matrix. LED that constitutes each light emitting dot at the leading edge
Alternatively, in an LED display device including an LED mounting drive control circuit board having an LED lamp, a synchronizing signal generated for each line is serial-parallel converted to input horizontal scan data and shifted by a clock signal. By taking the logical product of this synchronous pulse and the above clock signal as the clock signal of the data shift register as a synchronous pulse, one bit of data is fetched and input to each LED mounting drive control circuit board, and this operation is performed. An LED display device characterized in that each light-emitting dot emits light in response to a latch signal by being repeatedly performed.