JPS5913289A - Display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention - This invention provides a display device that displays characters as a dot pattern on a multi-digit dot matrix display tube having light emitting elements arranged in a dot matrix, such as a display device used in a cash register or the like. It is related to.

Conventionally, there was a device of this type as shown in Figure O1. In Figure 1, (1) is a digit decoder (digit
decoder), (2; hub module driver,
(31 is a multi-digit dot matrix display tube, (41 is a character generator
(5) is a dot matrix driver.

A large number of light emitting elements are arranged in a matrix in the multi-digit dot matrix display tube +31. :For example 1
The arrangement of light-emitting elements corresponding to the characters is 5 columns x 7 rows = number of numbers (hereinafter, this numerical example will be used in the explanation in this specification, but this invention is not limited to this value example). (This is not to say that this is not the case), and an example is shown in which the number 1' is displayed by the light emission of the light emitting element in the right part of the section designated by the symbol (3) in Figure 1.

The dot matrix driver (51) only the light-emitting elements to which the driving voltage of 3.2 is supplied emit light - the purpose of this display device is for cash registers. etc., the displayed characters are mainly numbers, and the position where the character is displayed represents the digit of the number.The numerical value represented by the digit signal input to the digit decoder (1) changes cyclically from one view to another.For example, the display tube (3
) displays numbers in 1 row and 10 columns, then the digit decoder (1) has 10 output lines from 0 to 9,...+0→≠2→...・→φ9→41→・
A digit signal is input in order of IIIa such that the signal logic on each output line becomes "L". In the digit decoder, the logical "l" signal of each output line from 0 to +9 becomes the driving voltage of the logic "l" on the corresponding drive line of the digit driver (2). A driving voltage of 1 is supplied to all 35 light emitting elements outside the characters. In addition, the arrangement of the 35 light emitting elements in one character is the same for each character, and the 10 light emitting elements located at the same arrangement position of the 10 characters in 1 row and 10 columns are connected slightly in parallel. 35 types of parallel circuits are constructed, and of the 35 types of parallel circuits, only the parallel circuit corresponding to the dot pattern of the character is supplied with the entire second drive voltage from the dot mark) IJ rack sliver (51).

Assuming that the dot pattern corresponding to the number l is as shown on the right side of the display tube (3), the second driving voltage is applied to all the light emitting elements placed in the array position corresponding to the array of this dot pattern. Therefore, if a driving voltage of 1 is supplied to all the light emitting elements in the display tube (3), 10 columns of numbers 1 should be displayed on the display tube (31). However, the dot matrix driver (the light emitting elements corresponding to the dot patterns from 51 to number 1) is supplied only to the light emitting elements corresponding to one letter located on the right side of the display tube (3). Since the second driving voltage is supplied to the display tube (32), the number 1 is displayed on the right side of the display tube (32), and then the digit signal changes and the light emitted for one character at another position in the display tube (31) is displayed. Driving element 1b: When supplying money, it becomes a display data signal or a character code that covers all other numbers, and the character generator (41) outputs a dot pattern indicated by the signal logic of each output line of Hanamoto. is a dot pattern of other characters, so other numbers are displayed at other positions on the display tube (3), and such a display is repeated cyclically in synchronization with the digit signal and display data signal. Therefore, it appears that a multi-digit number is constantly displayed on the display tube (31).

Since the conventional device is configured as described above, in order to generate the dot pattern of the character represented by the display data signal from the display data signal, a character generator (41) must be used, and this character generator (41 is a font memory Also known as font memory, it has a special design and is expensive, and since it is generally composed of a mask ROM, it is impossible to modify or change the font, that is, the dot pattern. (From 41 to the dot matrix driver (51) had the disadvantage of requiring 35 connection lines.

This invention was made in order to eliminate the above-mentioned five drawbacks of the conventional ones, and uses an inexpensive character generator that allows modification and change of fonts, and also allows the character generator to generate single character dots. pattern if
The output of the character grapher generator is read out multiple times (in the above example, 5 times corresponding to the 5 columns of dot patterns) by time-divisionally reading each row of dot patterns (consisting of 7 dots in the above example). The object of the present invention is to provide a display device with a simplified circuit.

The present invention will now be described in detail with reference to the drawings. FIG. 2 is a block diagram showing an embodiment of the present invention, in which the same reference numerals as in FIG. 1 indicate the same parts and operate in the same manner. (6: e-programmable ROM (hereinafter abbreviated as p-ROM), +
7+ is a counter, and 181 is a latch. In the above example where the dot pattern of one character consists of 7 rows x 5 columns of dots, the counter (7) is, for example, a quinary counter, and its parallel output is a 3-pit binary number (0 to 40).
Complete list of 5 types of count values When the count value reaches 5, it returns to 0) and p
-Configures the lower address of ROM +61. The parallel outputs of the counters (7) are decoded into numbers 0 to 4 of 5.
A set pulse of j1 negative order Mi logic "1" is output to the main output line.

The old number operation of the counter (7) and the change in the display data signal are synchronized, and while the display data signal is kept at the same data, the 81 value of the counter (7) changes in order from O to 4. do.

The display data signal is the upper address of the p-ROMt61.Access the memory location where the dot pattern of the character meant by the display data signal is stored, and start the counter (7).
) output 3 bits are p-ROM! Of the dot patterns defined by the upper addresses, the 7-bit dot patterns in columns 0 to 4 defined by the lower addresses are sequentially read out.

The read 7-bit dot pattern is applied to 5 latches (
81 latches (applied to the 810 input terminal, or stored only in the latches to which the set pulse is input at that time. In this way, the dot pattern of 5 rows of 7 dots each for one character is applied to the 5 latches. A second driving voltage is applied to the light emitting elements which are sequentially stored and connected to the output line corresponding to the dot pattern of the character among the 35 output lines via the dot matrix driver (5).Other operations are shown in Figure 1. The same is true for .

When the dot pattern of one character is generally represented by a dot array of n rows by m columns instead of a dot array of 7 rows by 5 columns, it is sufficient to provide fm latches with a capacity of n bits.

As described above, according to the present invention, it is possible to use an inexpensive p-ROM, which is often used for general purposes, as a character generator to read out one character's doratono (turn) one row at a time in a time-sharing manner, Since the structure is stored in a latch, the display device can be constructed at low cost.
In addition, it was possible to modify and change the font.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a conventional equipment, and FIG. 2 is a block diagram showing an embodiment of the present invention. (1)...Digital decoder, (2)...Digital driver, (31...Multi-digit dot matrix display tube, i5)...Dot matrix driver, (6
)... p-ROM. (71... Counter, (81... Latch. In addition, the same reference numerals in the figures indicate the same - or corresponding parts. Agent Shin Kuzuno -

Claims (1)

[Scope of Claims] A multi-digit dot matrix display tube in which light emitting elements corresponding to each dot NC are arranged in a matrix so as to display a plurality of characters in a dot pattern, and a total sequential change in the arrangement position of displayed characters within this display tube. a digit driver that decodes a scanning digit signal sound and supplies a driving voltage of 1 to a group of light emitting elements corresponding to a display character position in the display tube; means for inputting a character code representing a character to be displayed at every character position as a display data signal; A counter that sequentially generates numerical values to represent, and a character 11 dot pattern determined by the display data signal with the display data signal as the upper address and the contents of the counter as the lower address, which is determined by the contents of the counter. A programmable ROM from which the column number dot bar is read out, a latch device in which the output of the programmable ROM is stored each time the contents of the counter changes, and a light emitting element group corresponding to the output of the latch device. A dot matrix driver that supplies a second drive voltage, and a means for sequentially and repeatedly displaying a plurality of characters by causing a light emitting element to which both the first drive voltage and the second drive voltage are supplied to emit light. display device.