JPS61133463A - Electronic desk calculator - Google Patents

Abstract

PURPOSE:To read the display from the opposite face side similarly to the read from the front face side by applying inverting display control with the operation of a display inverting key. CONSTITUTION:When the level of input signals 1D, 1F, 2A, 2B, 2D, 2F, 2G are logical H with a switching signal 6 from a display inverting key 5 at 'H' level, since the switching signal 6, the input signal 1D are logical H and a switching signal7 is logical L, an output of an AND gate 1d1 is logical H, an output of an OR gate 1d0 is logical H and a segment 1d of the tens digit of a 7-segment display device 1 is driven by a driver 3. While input signals 1D, 1F, 2A, 2B, 2D, 2F, 2G remain logical H, the display inverting key 5 is operated and the switching signal 6 is logical L and then the switching signal 7 is logical H, an output of an AND gate1d2 is logical H by the input signal 1D, or OR gate 1c0 is logical H, and a segment 2c of the units digit of the 7-segment display device 2 is driven by the driver 3. Thus, it is possible to observe the result of input operation by the operation of the display inverting key 5 without changing the direction of the computer main body.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an electronic desktop calculator that can be reversely displayed on the facing side.

[Conventional technology]

Conventionally, the input calculation results of this type of electronic desktop calculator are displayed facing the operator so that the operator can easily check the results, and the results are displayed facing the operator. Nothing has been done about it.

[Problems to be solved]

However, such conventional electronic desktop calculators had no provision for the facing side, so when viewed from the facing side, the characters are reversed, so it is necessary to change the direction of the calculator to view it. When having a face-to-face meeting while showing the calculation results to the other person, there was a drawback in that the orientation of the computer had to be changed each time the calculation was performed.

Solution to Problem c] The present invention has been made in view of such conventional problems.When viewing input calculation results from the facing side, the computer has a normal display, To provide an electronic desktop calculator which switches the reverse display mode so that the reverse display mode can be read in the same way as the normal display when viewed from the opposite side compared to the normal display mode. To this end, the present invention employs a reversal control circuit to display characters so that they are not reversed when viewed from the opposite side when the display is set to reversal mode by operating the display reversal key.

By exchanging the upper and lower digits, and also by switching the upper and lower two segment displays in units of 7 segments corresponding to individual digits, the left and right four segments are displayed in a sash-like shape (rather than display switching). The display is controlled so that it looks the same as usual from the facing side.

〔Example〕

Next, the present invention will be explained in detail with reference to the drawings. Figure 1 shows an example of an electronic desktop calculator, (a)
(b) shows a normal display state, and (b) shows a reverse display state. 10 in the diagram
is an electronic desk calculator, 11 is a display, 12 is a calculation key,
5 is a display inversion key. In FIG. 2, an example of a two-digit display is shown to simplify the explanation.

The outputs 1a to 1g of the driver 3 are the respective segments l of the 7-segment display device 1 that displays the 10th digit.
It is assumed that the outputs 2a to 2g of the dry controller 3 drive the respective segments 2a to 2g of the seven segment device 2 that display the first digit. 4 is a reverse display control circuit, 6.7 is a switching signal, 8
is a NOT gate. Now, when the switching signal 6 from the 1 display inversion key 5 is 1H1, the input signal 10. IF, 2A.

When 2B, 2D, 2F, and 2G are @H", the input signal ID is A because switching signal 6 is "H" and switching signal 7 is @L"
The output of NDr-to 1d is @H#! 50111'-
The 1d6O output also becomes @H” and is sent to driver 3!11
Segment 1d of 7-segment display device 1 for 0th digit
is driven.

Similarly, input signals IF, 2A, 2B, 2D, 2F.

Segments if, 2m, 2b, 2d by 2GK.

Since 2f and 2g are driven, @1yo2 is displayed as shown in FIG. 3(a).

Here, input signal II), IF, 2A, 2B, 20° 2F
, 2G remains @H' and press 1 display inversion key 5't-
When the switching signal 6 becomes 1L" and the switching signal 7 becomes @H", the output of ANDr-to 1d becomes @H" and 90Rr-) 1c6 becomes 1H#, and the output of ANDr-to 1d becomes @H" and the output of Dry/3 becomes 1H#. 1 digit 7 segment display device 2
segment 2C is driven.

Similarly, input signals IF, 2A, 28.2D, 2F.

Segments 2e, lb, la, le by 2G.

Since le and Ig are each driven, "El" is displayed as shown in FIG. 3(b). This can be read as exactly ``13'' when viewed from the opposite side.

In this manner, by operating the display inversion key 5, it becomes possible to view the input calculation results without changing the orientation of the computer main body.

Even if the number of digits increases, it can be expanded using the same idea.

〔Effect of the invention〕

As explained above, by controlling the inverted display by the operation while the display is being inverted, the characters can be read in the same way as normal even from the facing side without being reversed, and input during face-to-face meetings etc. This has the effect that it can be read from the opposite side without any trouble, without having to change the orientation of the computer each time a calculation is performed.

[Brief explanation of the drawing]

FIG. 1(a) shows the normal display state of the electronic desktop calculator of the present invention, FIG. A circuit diagram showing an example, and FIG. 3 is a display example in the embodiment shown in FIG. It is. 1... 7-segment display denomination chair for the 10th digit 2...
7-segment display for 1st digit (Chair 3... Driver 4... Inversion display control circuit 5... Display inversion key 6.7... Switching signal 8... N0Tr-to

Claims (1)

[Claims] In an electronic desktop calculator that uses a 7-segment display device as the device that displays calculation results, there is a normal display mode and a 7-segment unit that swaps the upper and lower digits and corresponds to each individual digit. A reversal control circuit that can select a display mode in which two segments (upper and lower) are displayed and four segments (left and right) are displayed in a sash pattern, and the reversal control circuit is controlled to be inverted to enable normal display on the facing side. An electronic desk calculator characterized by having a display reversal key.