JPS5837548B2 - display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a display device including a dot-type character display and a mosaic-type character display, and more particularly to an improvement in a drive control circuit for driving each character display.

Since the dot-type character display and the mosaic-type character display have different forms of light-emitting portions, it is common for a display device including both character displays to provide a separate drive control circuit for each character display.

For example, as a drive control circuit for a mosaic type character display, a static drive driver is prepared for each digit, or a mosaic for each digit is replaced with a 3 (row direction) x 3 (column direction) matrix, and the dot As with the equation display, the same row of all digits is driven by a common row driver, and each column of all digits is driven by a column driver.

The former is clearly different from the drive control circuit of a dot-type character display.

The latter also has a dot-type character display with a 5-character dot structure.
Since the number of dots (in the column direction) x 7 dots (in the row direction) or more is present, separate drive control circuits are currently provided for the dot-type character display and the mosaic-type character display.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a display device in which a dot-type character display and a mosaic-type character display are efficiently driven by a common drive circuit.

Therefore, the display device according to the present invention includes a dot-type character display, a mosaic-type character display, one set of row drive lines, and a number of sets of column drive lines corresponding to the total number of digits of both character displays. and a drive circuit for driving each digit of the dot-type character display, each dot element group of each row of all digits of the dot-type character display is connected in series to a corresponding one of the row drive lines, and each digit of the dot-type character display is Dot element groups of each column are connected in series to a corresponding one of the column drive lines, and specific mosaic element groups of all digits of the mosaic type character display are connected to a corresponding one of the row drive lines. Each mosaic element is connected in series, and one or more specific mosaic elements of each digit of the mosaic character display are connected to a corresponding specific one of the column drive lines. .

That is, according to the present invention, the mosaic element groups of each digit of a mosaic type character display are virtually rearranged into a matrix arrangement according to the case of a dot type character display, and the rows of this matrix are
A row drive line and a column drive line are connected to one or more mosaic elements arranged in the column direction, and are driven by a common drive circuit with the dot type character display.

Hereinafter, the present invention will be explained in detail with reference to the accompanying drawings.

FIG. 1 shows a POS (Point of S) according to the present invention.
FIG. 3 shows a plan view of the display panel of the front center device for the terminal.

In one figure, on the display panel 1 there is a printing surface 2, a marker 3
, a 7-digit mosaic type liquid crystal character display 4 for displaying large numbers, and dot type character displays 7, 9 and 10 for small character sizes are arranged, respectively.

The operation guidance of the POS terminal is displayed using dot type character displays 9 and 10.

The reason why two displays are used is that there are cases where two types of guidance are displayed and the operator is asked to select one of them.

Data read from a credit card, answers to inquiries made to the central computer, and product codes read from price tags are displayed on a dot-type character display 7.

The amount and quantity (both numbers only) are displayed on a mosaic liquid crystal character display 4, and the dot type display 7 indicates whether the displayed content is an amount or a quantity, a total amount or a change amount, etc.

The status of the terminal, that is, whether it is online, offline, or in operation, is displayed by a combination of printing or handwriting on the print surface 2 and lighting of the marker 3.

This marker 3 is handled and driven as one mosaic element for each digit of the mosaic type liquid crystal character display 4, as will be described later.

FIG. 2 shows an example of drive control means for the character displays 4, 7, 9, and 10 and the Maca 3.

The drive circuit is separated from the row driver 11 and column driver 12, and the column driver 12 is separated from the column driver array 15 and shift register 14.

The operation timing of both drivers 11 and 12 is controlled by a control section 13.

A set of row drive lines from the row driver 11 extends in series through the dot character displays 9, 10.7 and the mosaic liquid crystal character display 4 in this order.

On the other hand, from the column driver array 15 of the column driver 12, there are as many sets of column drive lines as the total number of digits of all character displays, and these are connected in parallel to each character display.

FIG. 3 shows details of how to connect the row and column drive lines.

There are seven row drive lines X1 to X7, and the dot element groups of each row of the dot type character displays 7, 9, and 10 are connected in series to the corresponding row drive lines.

In addition, the mosaic element group of each digit of the mosaic liquid crystal character display 4 and the corresponding marker 3 are virtually arranged in a matrix of 3 rows x 3 columns, and the mosaic elements (markers) lined up in each row
are connected in series to the corresponding row drive lines X1, X2, and X3.

Column drive lines Y1-1 to Y1 with 5 lines per digit as one set
-5, ...Yn 1 to Yn4. YM-1
~YM-5 y """ is connected to the corresponding column dot element group or mosaic element group (marker) of the corresponding character display digit.

FIG. 4 shows details of the connection of the drive lines to the mosaic liquid crystal character display 4.

In the figure, a mosaic element group a = a certain digit of the character display 4
Marker 3 corresponding to h is shown.

Mosaic elements a, b and marker 3 are connected to row drive line X1
The mosaic elements f, g, c are connected in series with X2, and the mosaic elements e, d, h (h is for a decimal point) are connected in series with x3.

On the other hand, column drive line YM-1 has marker 3 and mosaic elements f, e, YM-2 has mosaic elements a, g, d, y
Mosaic elements b, c, and h are connected in series to M-s, respectively.

The same applies to other digits. Next, the display operation will be explained.

The row driver 11 connects row drive lines X1, X2, . . . in synchronization with a timing signal sent from the control section 13.
Drive the X7s one by one in sequence.

A column drive line is selected by the column driver array 15 in order to light up necessary ones of the dot elements, mosaic elements, and markers 3 at the intersections of the row drive line and each column drive line while driving a certain row drive line. driven by.

The control unit 13 is a character. It has a built-in generator that generates a character pattern from the character code given from the POS terminal or central computer and sends it to the shift register 14 as a serial signal.

For example, while driving the row drive line X1, a character pattern for the next row is shifted into the shift register 14.

When driving of row drive line X2 begins, the contents of shift register 14 are transferred in parallel to column driver array 15 and latched.

In this manner, each character display is driven.

As described above, since the mosaic type liquid crystal character display 4 is also driven by the same type of driver as the dot type character displays 7, 9, and 10, display control can be unified.
The drive control means including 3 can be simplified.

The mosaic type liquid crystal character display 4 is driven in a virtual matrix of 3 rows x 3 columns, while the dot type character display 7,
Since 9.10 is displayed in a matrix of 7 rows x 5 columns, the control unit 13 requires a memory area for both in the character generator.

However, since the mosaic type liquid crystal character display 4 displays only numbers and decimal points, the memory area for this is small and does not cause any disadvantage.

In other words, by unifying the control method, for example, the capacity of the ROM that stores the control program can be reduced, the circuit for executing the control program can be simplified, and the benefits of standardizing the driver can be far greater.

Here, the merits of the above-mentioned embodiment as a display device for a POS terminal will be briefly added.

Conventional display devices for POS terminals display operation guidance, messages from a central computer, the status of the terminal itself, etc. using a combination of a panel with necessary information printed on it and a large number of lamps (or light emitting diodes) for each item. There is.

In other words, a method is used in which lamps corresponding to the items to be displayed are lit.

In such a method, the panel becomes large, and therefore the display device itself becomes large.

Since POS terminals are installed in stores where the price per area is high, increasing the size of the device is extremely disadvantageous.

In other words, since there are restrictions on the size of the panel, it is not possible to increase the number of items that can be displayed.

Furthermore, it is not easy to incorporate a large number (several dozen or more) of lamps, etc., and this is disadvantageous in terms of cost and reliability.

All of the above-mentioned problems are solved according to this embodiment.

Incidentally, the mosaic type liquid crystal character display device 4 in the above embodiment may be replaced with another mosaic type character display device.

The marker 3 may also be integrated into the mosaic character display.

[Brief explanation of drawings]

1 and 2 show one embodiment of the present invention, FIG. 1 is a plan view of the display panel, FIG. 2 is a block diagram of the display drive section, and FIG. FIG. 4 is a schematic diagram showing connections of row and column drive lines. FIG. 4 is a detailed diagram of connections of row and column drive lines of a mosaic type liquid crystal character display and markers. 1...Display panel, 3...Marker, 4...Mosaic type liquid crystal character display, 7,9.10...Dot type character display, 11...Row driver, 12...Column Driver, 13... Control unit, 14... Shift register, 15
...Column driver array, X...Row drive line, Y
...column drive line.

Claims (1)

[Claims] 1 Dot type character display, mosaic type character display,
comprising a drive circuit that drives one set of row drive lines and a number of sets of column drive lines corresponding to the total number of digits of both character displays,
The dot element groups in each row of all digits of the dot-type character display are connected in series to the corresponding one of the row drive lines, and the dot element groups in each column of each digit of the dot-type character display are connected in series. Connect each in series to the corresponding one of the column drive wires,
A group of specific mosaic elements of all digits of the mosaic character display are connected in series to a corresponding one of the row drive lines, and one or more specific mosaic elements of each digit of the mosaic character display are connected in series. Display devices each connected to a corresponding specific one of the column drive lines.