JPS6353570B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to electronic devices such as calculators and teller's machines that suppress the display of invalid zeros in the upper digits of a display using an upper digit unnecessary zero suppression signal, and in particular display scale marks in an easy-to-read manner. This is how it was done.

Some conventional calculators have three-digit scale marks illuminated to facilitate reading when displaying numerical values. That is, the same symbol mark is placed in each digit as a three-digit scale mark, and the scale mark is illuminated according to the position of the decimal point. Furthermore, various methods have been proposed in which units such as 10,000, 1,000, 100, or MILLION are displayed on a liquid crystal display element in order to make it easier to read scale values. Unlike the scale, the shape of the symbol mark for each digit cannot be made the same, and there is a drawback that it can only be displayed when the decimal point position is determined in advance. Therefore, it is possible to place a mark such as 10,000 or 1,000 on the display as a scale unit that may be displayed for each digit, but this would increase the cost and make the individual marks small and difficult to read. The difficulty increases. Based on the above, it is a good idea to display the unit mark only when the display information is an integer. Further, in this case, if the unit display mark is lit even when the number of digits is small, it will feel bothersome, so in such a case, it is better not to display the unit.

The present invention has been made in view of the above points, and
An object of the present invention is to provide an electronic device that appropriately controls lighting of a unit mark display based on an unnecessary zero suppression signal and decimal point information.

The present invention will be described in detail below with reference to the drawings.

Figure 1 shows an example of the configuration of the calculator of the present invention, where CPU is a central processing unit, and DR is a central processing unit that converts numerical information processed by the CPU into other codes in order to store and display it. The first output drive section, DPR, is a second output drive section that is supplied with and stores only decimal point position information among the information processed by the central processing unit CPU.DIS is, for example, a 7-segment Japanese character on a liquid crystal display. In addition to the 6-digit display of the pattern, the display section has a unit symbol mark such as ○ 1000, ○ 1000, etc. at the top or bottom.For G1, the numerical value is displayed in the fourth digit, and the decimal point position is the lowest, that is, 4 digits or more. The AND gate detects that only integers are displayed and displays the mark ○ thousand, and G2 detects that a number is displayed in the 5th digit and the decimal point is at the lowest position and displays the mark ○ million. This is an AND gate for display. To explain in more detail, in Figure 1,
Each digit output LSD, 2D, 3 of the first output drive unit DR
D, 4D, 5D, MSD and second output drive section
Decimal point position display information DP for each digit of DPR
1, DP2, DP3, DP4, DP5, DP6 are supplied to each digit display position of the display DIS, and
AND gate G1 is supplied with DP1 output and 4D output, and AND gate G2 is supplied with DP1 output and 5D output.
supply the output. AND GATE G1 and G2
Let the respective outputs be the display signals for the marks ○1,000 and ○10,000 on the display unit DIS. The upper digit unnecessary zero suppression signal is sent from the central processing unit CPU to the first output drive unit DR in the form of a binary 4-bit 1111 F code, etc.
A general zero suppression method can be used in which the invalid zeros of the upper digits are determined.

Note that in the example in Figure 1, the output for each digit is shown by one line, but this is because the number of signal lines varies depending on the display drive time division ratio (duty cycle), but it is easy to understand. It is shown as a single line in the figure to make it easier to understand. For example, when the duty is 1/3, three signal lines are generally used per digit, but in this case, the number of gates such as AND gates G1 and G2 is increased,
An and-or configuration may be used.

Next, in Figure 2, the fourth digit is THOUSAND (abbreviation).
A modification of the present invention is shown when reading in units of TH), in which only the AND gate G1 shown in the first figure is arranged in the same way, and ○ is written at the top or bottom of the fourth digit of the display section DIS instead of ○. An appropriate pattern such as TH or 10 ³ may be placed. Furthermore, when the number of display digits increases, it is of course possible to add units of MILLION as necessary.

As is clear from the above description, according to the present invention, units can be displayed only when the displayed numerical value is an integer, and numerical values displayed over multiple digits can be displayed in an extremely easy-to-read format. Moreover, such a display has the advantage that it can be easily realized by only partially changing the output section of the electronic device.

[Brief explanation of drawings]

FIGS. 1 and 2 are block diagrams showing the configurations of two examples of electronic equipment according to the present invention. CPU...Central processing unit, DIS...Display section,
DR...first output drive section, DPR...second output drive section, G1, G2...and gate.

Claims (1)

[Scope of Claims] 1. A display section that displays a plurality of digits, and a plurality of units representing the plurality of specific digits that have different forms from each other in order to distinguish the units of the plurality of specific digits on the display section. a display means having a mark and a decimal point mark representing the position of the decimal point of the display section; a driving means for driving the display means; Means for driving and displaying at least the unit marks representing the plurality of specific digits of the display means in accordance with the number of effective digits, and not driving the plurality of unit marks when a value other than an integer is displayed. An electronic device characterized by having. 2. The electronic device according to claim 1, wherein the unit marks of the plurality of specific digits of the display means are respectively displayed as "10,000" and "1000".