JP2958808B2 - Segment display method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a segment display for blinking a predetermined segment of one of the characters and numbers in order to distinguish a pair of characters and numbers that are easily misread. About the method.

[Prior Art] Conventionally, in a 7-segment display unit, a common anode type 7-segment display unit or a common cathode type 7-segment display unit (BCD-To-Seven-
Decoder / Driver, etc.), numbers and symbols are displayed based on input information (input data) input from a CPU or the like. FIG. 3 is a display diagram using a conventional 7-segment display unit, FIG. 4 is a display explanatory diagram when the MB74LS273 is used, and FIG. 5 shows the correspondence between the numerical values indicating the functions of the MB74LS273 in FIG. 4 and the segment display. FIG.

In the figure, (2) indicates Oc to be displayed on the 7-segment display unit (3) based on input information from a CPU (not shown).
tal D-Type Flip-Flop With Clear MB74LS27
Reference numerals 3 and 3 denote a seven-segment display unit including an anode common display unit and each resistance element, and having segments at respective positions a to h.

The conventional seven-segment display device is configured as described above. For example, as shown in FIG. 4, in accordance with a command from a CPU, input data is converted to a seven-segment display unit (3) in decimal (0-9). Hexadecimal (0-F) display as well as display
It was displayed using MB74LS273 (2). This MB74LS2
In 73 (2), each bit of input data from the CPU corresponds to each segment (a to h) position, and sets input data based on a synchronous clock (CLOCK-N) input from the CPU. As shown in FIG. 5, desired numerical values and symbols are displayed on the 7-segment display unit (3). From the correspondence table, each segment is turned on at the Low level, and turned off at the High level.

[Problems to be Solved by the Invention] In the conventional 7-segment display device as described above, it is difficult to distinguish between the numeral 6 and the letter b, and an error code at the time of occurrence of a failure or a status code of status display is erroneously read. However, there has been a problem that the user cannot be given an appropriate instruction.

The present invention has been made in order to solve such a problem, and in order to distinguish a pair of characters and numbers that are liable to be erroneously read from each other, one predetermined segment of the characters and numbers is blinked. It is an object of the present invention to obtain a segment display method that evokes a warning and prevents misreading.

[Means for Solving the Problems] A segment display method according to the present invention provides a segment display in which a segment display unit having a plurality of segments and displaying characters and numbers according to a display pattern of the plurality of segments is displayed. In the method, the character / number to be displayed is the same as the display pattern of the other segment except for the predetermined segment, and the predetermined segment is selected from a pair of characters / numbers having a relationship that is easily misread. Characters / numbers to be displayed (hereinafter, the characters /
(A number) is determined at regular time intervals, and if the character or number to be displayed is determined to be a character or number on one side, the displayed character or number is converted to a pair of characters. A step of judging whether or not a character or a number that does not display a predetermined segment of the number (hereinafter referred to as the other side of the character or number), and the character or number being displayed is the other side of the character or number. Is determined, the character on one side
When displaying a number and judging that the character / number being displayed is not the other side of the character / number, there is a step of displaying the other side of the character / number. A predetermined segment is blinked and displayed.

[Function] In the present invention, when a character / number is displayed by a segment display unit having a plurality of segments and displaying characters / numbers by a display pattern of the plurality of segments, the character / number to be displayed is Judgment is a character / number on one side displaying a predetermined segment, out of a pair of characters / numerals having the same display pattern of other segments except for the predetermined segment and having a relationship that is easily misread. Then, it is determined whether or not the displayed character / number is a character / number on the other side which does not display a predetermined segment among the pair of characters / numbers. If the displayed letter / number is the letter / number on the other side, the letter / number on one side is displayed.If the letter / number displayed is the letter / number on the other side, the letter / number on the other side is displayed. I do. By performing this operation at regular time intervals, if the character / number to be displayed is a character / number on one side of a pair of characters / numbers having a relationship that is easy to misinterpret each other, it is easy to misinterpret each other. A pair of characters and numbers having a relationship are alternately displayed, and a predetermined segment is blinked.

FIG. 1 is a block diagram of an embodiment of the present invention.
(2) and (3) are the same as above. In the figure, (1) is an MCPU (for example, i-8051) having a built-in timer, ROM, RAM, and the like. The ROM has display control means for displaying the numeral 6 and the alphabetic character b separately, It has a data conversion table. In order to distinguish the number 6, the data of the number 6 (40h) and the letter b (C0H) are alternately transmitted from the MCPU (1) to the MB74LS273 at a cycle of, for example, 250 [ms].
It has a built-in timer for outputting to (2) and an external interrupt timer (not shown).

The present invention is configured as described above, and FIG.
It is a flowchart of the display timer processing routine which interrupts every 250 [ms] showing the display operation of the figure, and the operation will be described.

From step 1, when the MCPU (1) causes the 7-segment display unit (3) to display characters by the display control means stored in the ROM, first, data to be output to the MB74LS273 (2) excludes predetermined segments. Data of one side of a pair of characters or numbers (hereinafter simply referred to as characters) in a display pattern of other segments that are the same and easily misread each other, for example, numeral 6 (character code 40)
H) is determined (compared). The data is number 6
If not, the process returns to the conventional process of step 7, but if the data is numeral 6, the process proceeds to step 2.

From step 2, the MCPU (1) determines whether the character displayed immediately before on the 7-segment display unit (3) is the alphabet b, which is data on the other side in a pair of characters that is easily misread with the numeral 6. Judge whether or not. This is to determine whether to display the numeral 6 or the alphabet b (character code C0H). If the letter "b" is displayed, the process proceeds to step 3, and if not, the process proceeds to step 5.

From step 3, the MCPU (1) proceeds to step 4 to clear the immediately preceding display b flag register and output the numeral 6.

From step 4, the MCPU (1) converts the number 6 to MB74LS273
(2) and output to the 7-segment display unit (3) via the MB74LS273 (2). At this time, the 7-segment display section (3) displays the a-segment, which is a portion for distinguishing the alphabetical character b from the numeral 6, in a lit state. afterwards,
Proceed to step 7 of the conventional process.

On the other hand, if the alphabetic character b is not displayed in step 2 from step 5, the immediately preceding display b flag register is set, and the process proceeds to step 6.

From step 6, the MCPU (1) outputs the alphabet b (C0H) and outputs it to the 7-segment display unit (3) via the MB74LS273 (2). At that time, 7 segment display section (3)
Is displayed in a state where the a segment of the alphabet b (C0H) is turned off, and thereafter, the process proceeds to step 7 of the conventional processing.

In this way, 250 [m
In the cycle [s], the display timer processing routine is called, and 6 (40H) and b (C0H) can be alternately displayed.

In the present embodiment, the description has been made using the MCPU (1) in which the storage means (ROM, RAM) is built in. However, the present invention is not limited to this, and an external storage means may be used. When there are a plurality of 7-segment display units (3), the display timer processing routine may be subroutine to process each of the 7-segment display units (3). May be blinked by the same means as described above. Further, without being limited to the seven-segment display, it goes without saying that misreading of not only numbers but also characters can be prevented and discriminated.

[Effects of the Invention] As described above, according to the present invention, characters and numerals to be displayed have the same display pattern of other segments except for a predetermined segment, and have a relationship that they are easily misread. Judge whether it is a character / number on one side of a pair of letters / numbers, and if it is a character / number on the one side to display a predetermined segment, the character / number on one side and a predetermined segment Characters and numbers on the other side that are not displayed are alternately displayed at regular intervals, and as a result, the predetermined segment is blinked, so that the segment is highlighted by blinking and the character is highlighted. -It is easy to judge numbers and misreading can be prevented.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram of an embodiment of the present invention, FIG. 2 is a flowchart showing the display operation of FIG. 1, FIG. 3 is a display diagram using a conventional 7-segment display unit, and FIG.
FIG. 5 is a diagram illustrating display when the LS273 is used, and FIG. 5 is a diagram showing correspondence between numerical values indicating functions of the MB74LS273 and segment display. In the figure, (1) is MCPU, (2) is MB74LS273,
(3) is a 7-segment display unit.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) G09G 3/04

Claims (1)

(57) [Claims] 1. A segment display method for displaying characters and numerals in a segment display unit having a plurality of segments and displaying characters and numerals according to the display pattern of the plurality of segments, wherein the characters and numerals to be displayed are , Except for a predetermined segment, the display pattern of the other segments is the same, and among a pair of characters and numbers having a relationship that is easy to misread each other, a character or a number for displaying a predetermined segment (hereinafter, referred to as
A step of determining at regular time intervals whether or not it is a character / number on one side; and determining that the character / number to be displayed is the character / number on the one side,・ The number is
Judging whether or not the pair of characters / numbers is a character / number which does not display a predetermined segment (hereinafter, referred to as the other-side character / number); If it is determined that the character / number is one, the character / number on the one side is displayed, and if it is determined that the character / number being displayed is not the character / number on the other side, the character / number on the other side is displayed. And displaying the predetermined segment in a blinking manner when displaying the one-sided character / number.