JPH08297473A - Luminance data receiving circuit in LED display device - Google Patents

Abstract

(57) [Abstract] [Objective] The present invention relates to improvement of a luminance data receiving circuit in an LED display device for numerical information, and particularly to reduce the number of parts. A serial / parallel conversion circuit 8 having a latch circuit 9 for converting serial data transmitted for an LED display device into parallel data is provided, and the serial / parallel conversion circuit 8 continuously outputs luminance data contained in the serial data. In the luminance data receiving circuit 6 for converting the serial luminance data converted into the serial data into the parallel luminance data,
A second serial-parallel conversion circuit 1 having a latch circuit 16 on the output side of the serial-parallel conversion circuit 8.
5 is provided to convert the serial luminance data converted into the continuous serial data by the second serial / parallel conversion circuit 15 into parallel luminance data.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention has seven segments or one.
Numerical information LED for converting data transferred as brightness data for 6-segment display device into parallel data
The present invention relates to a luminance data receiving circuit in a display device.

[0002]

2. Description of the Related Art Conventionally, for example, in order for banks such as financial institutions to provide customers with exchange rates and various interest rate information,
An interest rate board that displays various financial information is installed in the store to provide services to customers. Then, these various types of financial information are transmitted from the head office or the financial information service providing organization to those branches through a communication line, converted into display data, and displayed on the display device. According to the present invention, as shown in FIG. 3, serial data, which is numerical information transmitted through the communication line 1, is displayed on the display device 2.
Is sent to the 7-segment display control circuit 5 via the modem 3 and the main control unit 4 and the parallel data is transmitted from the 7-segment display control circuit 5 to the luminance data receiving circuit 6 as parallel data
This is transferred to the segment LED circuit 7 and relates to an improvement of the luminance data receiving circuit 6 in the LED display device of this numerical information.

In the conventional circuit configuration of the luminance data receiving circuit 6, as shown in FIG. 4, serial data from the 7-segment display control circuit 5 is converted into a serial / parallel conversion circuit 8.
The data is converted into parallel data by the latch circuit 9, and the brightness data is converted into serial data by this conversion.
The serial luminance data is further converted into 4-bit parallel luminance data by the flip-flop circuit (F / F circuit) 10. Then, the numerical information converted into parallel data by the serial / parallel conversion circuit 8,
And the parallel luminance data converted by the F / F circuit 10 is the luminance gate creation circuit 1 of the 7-segment LED circuit 7.
1, a display device drive circuit (not shown) is driven via the scan signal generation circuit 12 and the gate circuit 13. The timing of each signal in this case is
This is as shown in FIG. The brightness data receiving circuit 6 of this conventional example is mounted with 6 printed boards in the case of a 9-row type system and 12 printed boards in the case of a 18-row type system. The serial data is 40 bits per one printed circuit board, and 240 bits in the case of the 9-row type, and the data of one screen is transferred.
The first bit of each printed circuit board during this period is used as luminance data.

[0004]

However, in the above-mentioned conventional circuit, the serial / parallel conversion circuit 8 is used.
The serial luminance data converted into serial data by the F / F circuit 10 is converted into parallel luminance data by the F / F circuit 10. However, the configuration of the F / F circuit 10 is extremely complicated, requires a large number of parts, and is expensive. In addition, the mounting density becomes high, which adversely affects the circuit quality in the mounting process. The present invention has been made to solve these problems, and provides a luminance data receiving circuit that can reduce the number of parts as compared with the conventional circuit.

[0005]

The luminance data receiving circuit in the LED display device of the present invention comprises 7 segments or 1 segment.
A serial-parallel conversion circuit having a latch circuit for converting serial data transmitted for a 6-segment LED display device into parallel data is provided.
In a brightness data receiving circuit for converting the brightness data included in the serial data into continuous serial data by the parallel conversion circuit, and converting the serial brightness data converted into the serial data into parallel brightness data,
A second serial-parallel conversion circuit having a latch circuit is provided on the output side of the serial-parallel conversion circuit,
The serial brightness data converted into the continuous serial data by the second serial-parallel conversion circuit is converted into parallel brightness data having a required number of bits.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a luminance data receiving circuit 14 in an LED display device for numerical information according to the present invention, which corresponds to the portion of the conventional luminance data receiving circuit 6 shown in FIG. In FIG. 1, 8 is a first serial-parallel conversion circuit, 9 is a first latch circuit, which is the same as the serial-parallel conversion circuit 8 and the latch circuit 9 shown in FIG. 15 is a second serial-parallel conversion circuit, 1
6 is a second latch circuit, and 17 is a NOT gate. As described above, the luminance data receiving circuit 14 of the present invention has a two-stage configuration of the serial / parallel conversion circuit and the latch circuit. The operation of the luminance data receiving circuit 14 of the present invention will be described based on the timing chart of each signal shown in FIG.

As described in the conventional example, the serial data is 40 bits per one printed board, and the data for six boards is sent as 240 bits. Of this data
Bits 1, 41, 81, 121, 161.201 are sent as luminance data of each printed circuit board. Therefore, the serial data converted by the serial / parallel conversion circuit 8 and the latch circuit 9 becomes 1 bit of the parallel data. In addition, the brightness data is
Serial luminance data is obtained at the outputs of the parallel conversion circuit 8 and the latch circuit 9. Since this signal is a 1-bit signal of parallel data, the timing is the same as that of parallel data, but D1 to D4 are luminance data "O".
It is used as H "to" FH ", and D5 to D8 are not used. Since this data is apparently serial data, it is further serialized by the serial / parallel conversion circuit 15 and the latch circuit 16 by the latch pulse. The parallel luminance data is obtained by performing the parallel conversion.This signal is converted from the serial luminance data to the parallel for each latch pulse, and the data is updated for each latch pulse.

As described above, according to the present invention, the luminance data included in the numerical information data is converted into the parallel luminance data by forming the simple circuit, that is, the conversion circuit including the serial / parallel conversion circuit and the latch circuit in two stages. Since it can be obtained, the number of electronic circuit components can be reduced by about 20% as compared with a circuit using a conventional serial / parallel conversion circuit, a latch circuit, and an F / F circuit. In addition, although the above-mentioned embodiment explained the example which applied this invention to the 7 segment LED display apparatus, the same circuit structure can be applied also to a 16 segment LED display apparatus.

[0009]

As described in detail above, the luminance data receiving circuit in the LED display device for numerical information of the present invention reduces the number of electronic circuit parts as compared with the circuit using the conventional F / F circuit. As a result, the cost can be reduced, the packaging density can be relaxed, and the reliability of the circuit can be improved.

[Brief description of drawings]

FIG. 1 is a circuit diagram of an embodiment of the present invention.

FIG. 2 is a timing chart of each signal in the circuit according to the exemplary embodiment of the present invention.

FIG. 3 is a block circuit diagram of an LED display device.

FIG. 4 is a circuit diagram of a conventional example.

FIG. 5 is a timing chart of each signal in the conventional circuit.

[Explanation of symbols]

 1 Communication Line 2 Display Device 3 Modem 4 Main Control Section 5 7-Segment Display Control Circuit 6, 14 Luminance Data Reception Circuit 7 7-Segment LED Circuit 8, 15 Serial / Parallel Conversion Circuit 9, 16 Latch Circuit 10 Flip-Flop Circuit 11 Luminance Gate Creation circuit 12 Scan signal creation circuit 13 Gate circuit 17 NOT gate

Claims (1)

[Claims] 1. A 7-segment or 16-segment L
A serial-parallel conversion circuit having a latch circuit for converting serial data transmitted for an ED display device to parallel data is provided, and the serial-parallel conversion circuit converts the luminance data included in the serial data into continuous serial data. Then, in the luminance data receiving circuit for converting the serial luminance data converted into the serial data into the parallel luminance data, a second serial / parallel converting circuit having a latch circuit is provided on the output side of the serial / parallel converting circuit. Provided,
A luminance data receiving circuit in an LED display device, wherein serial luminance data converted into the continuous serial data by the second serial-parallel conversion circuit is converted into parallel luminance data having a required number of bits. .