JPH068627Y2 - Segment display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is an LED capable of displaying multi-digit numbers or characters.
The present invention relates to a segment display comprising a plurality of segments, which is used for a display using a (light emitting diode), a fluorescent display tube or a liquid crystal. This segment display is used for a display device for displaying numerical characters such as a calculator, a clock or a large display.

〔Overview〕

The present invention relates to a multi-digit segment display for displaying numbers or characters in multiple segments. In a multi-digit segment display, a hyphen insertion circuit for displaying numbers and hyphens in one digit number segment By providing a circuit for blinking the corner points, the hyphen display and the time display can be performed on the segment display with a small number of digits by a simple circuit.

[Conventional technology]

2. Description of the Related Art Conventionally, a display device used for a display device such as a calculator or a digital display clock displays a single number or character with a plurality of LEDs such as a 7-segment or 8-segment LED, and displays multiple numbers by arranging them in large numbers. It was a thing.

In this multi-digit display, the display data input with a BCD code or the like is decoded by a decoder, and the segment driver that causes each segment to emit light by this decoded signal causes the LED of each digit segment to emit light to display the desired display. It is something to do.

[Problems to be solved by the invention]

However, in the conventional segment display, when displaying the negative sign of the number, since the segment display for one digit is used, for example, when displaying the number "-1999" as shown in FIG. Requires a segment display device for five digits, and there is a problem that power consumption increases as the number of LEDs increases.

Further, it is possible to display the one corresponding to this negative sign at the most significant digit and display, for example, "-1" in one digit numeral. For that purpose, a special display control integrated circuit is used. However, since it cannot be displayed using a general-purpose integrated circuit, there is a problem that it cannot be manufactured at low cost. Furthermore, when a special display control integrated circuit is used, it is not possible to display in the form of a hyphen in the middle of the digit, so there is no flexibility in the display of numbers, etc. There was a problem that I could not try to display the numbers.

In addition, when you want to use the segment display as a clock display, conventionally, a colon ":" is displayed to distinguish between hours and minutes and minutes and seconds, and a 1-digit segment display is used for this colon. Since it is used, a segment display for at least 5 digits is required, power consumption is increased, and a segment display for 1 digit is required, which causes a problem that the cost cannot be reduced.

The present invention solves the above-mentioned conventional drawbacks by displaying a negative sign and a hyphen on a segment display with a small number of digits, and by displaying a clock without using a segment display for one digit. An object of the present invention is to provide a segment display device that consumes less power and can be manufactured at low cost.

[Means for solving problems]

The present invention is directed to a decoder that decodes input display data and outputs it as a display control signal, a segment driver that outputs an electric signal that causes a plurality of segments to emit light according to the data output decoded by this decoder, and a segment driver of this segment driver. In a segment display comprising a multi-digit light emitter for displaying a multi-digit number or character, each segment being composed of a plurality of segments that emit light according to an output signal, and inputting data indicating a hyphen from the input data, It is characterized in that a hyphen insertion circuit for logically combining the output hyphen with the data to be displayed and giving the data to the segment driver is provided.

In addition, the present invention provides the multi-digit light emitting input for simultaneously blinking the decimal point display segment of the left light emitter of the adjacent light emitters of the multi-digit light emitter and the dot display segment provided in the upper left corner of the right light emitter. A timer circuit can be provided for the container.

[Action]

The segment driver that drives the segment of each digit of the segment display has the input of the decoder that decodes the input display data and outputs the display control signal, as well as the segment of the hyphen (G in the segment code) within that digit. The output of the hyphen insertion circuit to be displayed is input.

This hyphen insertion circuit gives the hyphen display output to the segment driver and the hyphen part output of the decoder output to the segment driver by inputting the negative sign in the input display data or the hyphen display signal. Can display only the hyphen, or can display the negative sign and the number at the most significant digit within one digit.

Furthermore, when performing the clock display, the segment display of the present invention displays the time by blinking the decimal point display section and the display segment in the upper left corner of the adjacent segment displays by the input from the timer circuit. It can be carried out.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

Reference numerals 11, 12, 13, and 14 are 4-digit LED displays, each of which includes a 7-segment number display LED and a decimal point display dot LED.
The LED of the segment displays "0" to "9" in the segments A to G, and the decimal point dot indicates the decimal point in the numerical display. In the present embodiment, the decimal point dots are indicated by the reference numeral 15 on the LED display 12, but LEs of other digits are used.
The D displays 11, 13 and 14 are also provided respectively and are omitted in this figure. Further, a dot LED 16 having the same size as the decimal point dot is provided at the upper left corner of the third digit LED display 13 adjacent to the second digit LED display 12.

The 4-digit LED displays 11 to 14 are inputted with electric signals from the segment drivers 21, 22, 23 and 24 which output electric signals for driving the LED segments of the respective digits. These segment drivers 21 to 24 are connected in parallel to the bus from the connector 60 to which the display data is input.
The composite data from the decoders 31, 32, 33, 34 that decode the display data input to 61 and decode each segment display data are input. Also, this segment driver 21-24
Display data from the bus 61 and decoders 31 to 34
The control signal of the hyphen part of the output of (the control signal for displaying G in the segment) is input, and the hyphen insertion circuit 41, 42, 43, 44 for forcibly displaying the hyphen part of each LED display 11-14. Output is input. Further, the input from the connector 60 is also input to the timer circuit 50, and the output of the timer circuit 50 is input to the adjacent LED displays 12 and 13 among the LED displays 11 to 14 which are adjacent to each other. Dot 15 of dot and dot LED 16 of LED display 13
It is configured to blink and.

FIG. 2 is a block diagram showing in more detail the configuration for displaying a hyphen on the LED display 12 of FIG.

LED display 12 is a 7-segment LED of A to G
And are those numbers by the LED of the decimal point display dot 15 is displayed, the input terminal No.1 is connected to a display power source, Nanba3～nanba9 output terminal 1 ₀ of the segment driver 22 ~ It is connected to 1 _6, N to display the decimal point dot 15
The o.10 terminal is connected to the timer circuit 50. Of the output from the decoder 32 of the segment driver 22, the output of the input terminal No. 2 corresponding to the segment G is not directly input from the decoder 32, but is input via the OR circuit 74 in the hyphen insertion circuit 42. It

The hyphen insertion circuit 42 includes an AND circuit 71 for multiplying the data “1” and “3” in the bus 61, and the AND circuit 71.
The flip-flop 73 is activated by the output of the flip-flop 73, the output Q of the flip-flop 73, and the OR circuit 74 for taking the output "g" of the decoder 32. A clock signal is being input.

The feature of this embodiment is that the hyphen insertion circuit 41-
44 is realized by a simple circuit, and conventionally,
The control signal is input from the output terminal "g" of the decoder 32 to the input terminal No. 2 of the segment driver 22 as indicated by the dotted line 63. Input terminal N of segment driver 22
The feature is that it is connected to o.2.

Next, FIG. 3 shows in detail the structure in which the dot display dot 15 and the decimal point display dot 15 of the LED displays 12 and 13 adjacent to each other blink.

The timer circuit 50 uses a timer IC 555, and
C outputs an intermittent blinking signal from its output terminal “3” according to the time constant determined by the inputs R ₅₁ , R ₅₂ , and C ₅₃ . The output from this output terminal "3" is the LED
Terminal for emitting decimal point display dot 15 on display 12
No. 10 and the terminal No. 2 for emitting the dot LED 16 of the LED display 13 are connected. The timer circuit 50 operates by the power source input from the connector 60.

Next, the operation of the segment display circuit of this embodiment will be described.

8-bit display data is input to the connector 60, and the display data is input to the decoders 31 to 34 and the hyphen insertion circuits 41 to 44, respectively. The hyphen inserting circuits 41 to 44 have a numeric display and a negative sign display in the display data, and when display data which can be simultaneously displayed on the same LED display is input, the AND circuit 71 flips the data.
Input terminal of the segment driver that sets 73 and causes its output to emit the segment “G” through the OR circuit 74.
Output to No.2.

As a result, an LED composed of 7 segments from A to G
As shown in FIG. 4, by controlling the light emission of "-1
999 "can be displayed by a 4-digit LED display. Further, as shown in FIG. 5, when only the hyphen display input is input, it can be displayed in the form of "12-6".

Further, as shown in FIG. 6, a plurality of 4-digit indicators can be connected and used. For example, "14-6" in FIG. 6 is displayed as the product lot number, and "75" is displayed.
8 ”can be used to indicate the number of products produced. Therefore, by displaying only the hyphen through the insertion circuit and using the blank, it is possible to use not only the display of the numbers but also the display of various meanings at the production site or the like.

Since the control output “g” for displaying the segment “G” of each decoder 31 to 34 is input to each segment driver via the OR circuit 74, the segment “G” other than the hyphen for displaying the segment “G” is displayed. There is no effect on the display.

Next, an operation of displaying time as a clock function will be described.

When displaying the time as a clock function, the timer circuit 50 is activated from the connector 60, and the timer circuit 50 gives the LED displays 12 and 13 a blinking signal determined by the time constant. The signal of this timer circuit 50 is the LED display.
Twelve decimal point display dots 15 and dot LED 16 of the LED display 13 are made to blink.

Further, the display data of the time is given to each of the decoders 31 to 34 as the display data, and the LED displays 11 to 14 display the numbers. For this reason, for example, LED displays
11 and 12 are hour display, LED display 13 and
14 minutes display, between which two dots LED
Blinks, so that it can be used as a display function of a clock as shown in the display example of FIG.

In the above embodiment, when the LED displays 12 to 14 are used as the display function of the clock, the LED display
13 is composed of 7 segments A to G for displaying numbers and 8 segments of decimal point display dots, and 9 segments by additionally providing a dot LED 16 at a position symmetrical to the decimal point display dot in the upper left corner. As explained in the example, this LED display 13 is an LED display that uses 8 segments up to the decimal point display dot, and the LED display 12 on the left side is upside down and installed.
By providing the decimal point display dot of the display 13 at a position symmetrical to the decimal point display dot 15 of the LED display 12, it is possible to blink the decimal point display dots of both the LED displays 12 and 13 to display the time. .

In this case, the connection between the LED display 13 and the segment driver 23 is such that the other LED displays 11, 12, 14 are connected.
The numbers can be similarly displayed by connecting symmetrically with and reversing the display control of the segments A to G from the display of the other LED displays.

By doing this, the LED display can be converted into a conventional 8-segment LED display and a 7-segment LED display.
Since the time display can be performed in combination with the ED display, the LED display 13 cannot display the decimal point, but a cheaper segment display can be used as the clock display function. In this case, since the decimal point cannot be displayed on the LED display 13 and the decimal point is not displayed when the number is displayed on the LED display, L
The ED displays 11 and 13 may be LED displays composed of 7 segments.

In addition, although the segment display of the above-described embodiment is described using the LED segment, it goes without saying that a fluorescent display tube or a liquid crystal segment may be used instead of the LED segment.

[Effect of device]

As described above, according to the present invention, the negative sign display, the hyphen display, and the clock display can be performed by the LED segment display or the other segment display having a small number of digits. Since the clock display function can be performed by a simple circuit, the segment display can be manufactured at low cost.

Furthermore, since the number of segment displays used can be reduced, when using LED segment displays or fluorescent display tube segment displays, the power consumption can be reduced and the amount of heat generated can be reduced. You can

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention. FIG. 2 is a block diagram showing in detail a part of the configuration for displaying the hyphen of the embodiment. FIG. 3 is a block diagram showing details of the configuration for performing blinking in the embodiment. FIG. 4 is a diagram showing an example of displaying negative numbers in the embodiment. FIG. 5 is a diagram showing an example in which the hyphen of the embodiment is displayed. FIG. 6 is a diagram showing an example in which the segment displays of the embodiment are connected and displayed. FIG. 7 is a diagram showing an example in which the clock display of the embodiment is performed. FIG. 8 is a diagram showing an example in which a negative number is displayed using a conventional 5-digit display. FIG. 9 is a diagram showing an example in which a clock is displayed using a conventional 5-digit display. 11,12,13,14 ... LED display, 15 ... decimal point display dot, 16 ... dot LED, 21,22,23,24 ......
Segment driver, 31, 32, 33, 34 ... Decoder, 4
1, 42, 43, 44 ... hyphen insertion circuit, 50 ... timer circuit, 60 ... connector, 61 ... bus, 71 ... AND circuit,
73 ... Flip-flop, 74 ... OR circuit.

Claims (2)

[Scope of utility model registration request] 1. A decoder that decodes input display data and outputs it as a display control signal, a segment driver that outputs an electric signal that causes a plurality of segments to emit light by the data output decoded by this decoder, and this segment driver In the segment display, which is composed of a plurality of segments each of which emits light according to the output signal of, and which has a multi-digit light emitter that displays a multi-digit number or character, input the data indicating the hyphen from the above input data, A segment display comprising a hyphen insertion circuit which logically combines the data output from a decoder output hyphen with the segment display and supplies the segment driver with the data. 2. The multi-digit light emitter is an input for simultaneously blinking the decimal point display segment of the left light emitter of the adjacent light emitters of the multi-digit light emitter and the dot display segment provided in the upper left corner of the right light emitter. The segment display according to claim 1, further comprising a timer circuit provided to the display.