JPS597953B2 - IC for electronic clock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an IC for an electronic watch that simultaneously displays time information for the month and day.

FIG. 1a shows an example of a display of a liquid crystal display type digital electronic watch.

In this display example, 12:30:30 and February 12th are displayed.

The electrode pattern of the liquid crystal cell at this time is as shown in FIG. 1b.

The number 2 display displays numbers 1 to 12, and the number 4 display displays numbers 1 to 31.

However, in Europe, the display example in Figure 1a is 12
I read it as 30 minutes and 30 seconds and December 2nd.

This is because it is customary to read the first number from the left side as the date and the next number as the month when viewing the month and day time information.

Therefore, in order to display the month and date in this European system, it is necessary to configure the electrode pattern of the liquid crystal display cell as shown in FIG. 1C.

By the way, it is an IC for an electronic watch that displays such date information, but if it is the same IC, it will be
When considering configuring a clock by adding a liquid crystal cell of 1. If the IC is configured by matching the output end position of the segment drive signal output from the output end of the IC with the liquid crystal cell shown in Figure 1b, then this IC will be Using this method, it would be difficult to make a watch with the liquid crystal cell shown in Figure 1C added.

This is because the position of the output end does not match the lead electrode position of the liquid crystal cell shown in FIG.

Therefore, in the present invention, an IC for an electronic watch that displays information on the month and day is configured so that segment drive signals for "month" and "day" can be switched and output from the same output terminal. The purpose is to solve the above problems by providing.

Figure 2 shows the situation shown in Figure 1. Minute. It is a liquid crystal cell configured to be able to display seconds, month and day display information in both domestic and European display systems, and both display 6 and display 8 can display numbers from 1 to 31.

FIG. 3 is an enlarged view of the display 6 and display 8 that display the month and day information in FIG. There is.

Segments with the same symbol are segments that are driven simultaneously.

FIG. 4 is a partial circuit block diagram of one embodiment of the IC 9 for electronic timepieces according to the present invention, which was created with the intention of adding the liquid crystal display cells shown in FIGS. 2 and 3 to form a timepiece. It is.

10 is an oscillation circuit, 12 is a frequency dividing circuit, 14 is a "second" counter, 16 is a "minute" counter, 18 is an "hour" counter, 2
0 is a "date" counter, and 22 is a "month" counter.

24 is a "date" decoder and drive circuit, 26 is a "month" decoder drive circuit, and the "date" decoder drive circuit 24 to 1
The segment drive signal line for the 0th digit is 4, 28, 30,
32, 34, and one segment drive signal line 36 for the 10th digit comes out from the "moon" decoder drive circuit 26.

The decoder drive circuits for "hours,""minutes," and "seconds" and the segment drive signal lines from them, and the segment drive signal lines for the first digit from the decoder drive circuits 26 and 24 for "month" and "day" are omitted here. are doing.

a,' to d1' and a2' to d2' are a shown in Fig. 3.
The output terminals are connected to segments 1 to d and a2 to d2, and the positions of these output terminals are in the order in which connection with the liquid crystal display cell of FIG. 3 is considered.

38 is a switching gate for switching the "month" and "day" segment drive signals transmitted from these output terminals;
is this switching mail terminal.

When this terminal 40 is set to H level, date information is transmitted to a1' to d1', "month" information is transmitted to b2' and d2', and the European system month/day information is displayed. This is realized on the liquid crystal display cell shown in Figure 2.

When this terminal 40 is set to L level, "month" information is transmitted to b1' and d1', and date information is transmitted to a2' to d2'. Display information.

Although omitted here, it goes without saying that the output position of the first digit of the month/day information can also be switched in the same way.

As described above, by using the electronic timepiece IC according to the present invention, it is possible to display time information of month and day in both the European system and the domestic system, making it possible to provide an extremely versatile IC.

Of course, this electronic watch IC may be configured not only to fit the embodiment shown in FIG. 4 but also to each of the liquid crystal display cells shown in FIG. 1b and FIG. 1C. It is not limited to display cells, but may be ICs for other photoelectric display devices such as light emitting diodes and ECs.

Fig. 5 shows display examples of a liquid crystal display timepiece using the electronic timepiece IC according to the present invention (Fig. 5a, Fig. 5b, Fig. 5C) and an electrode pattern diagram of this liquid crystal display timepiece (Fig. 5). d).

Figure 5 a shows 2:50 minutes 30 seconds, Figure 5 b and 5
Figure C both shows December 30th.

At this time, in the electronic clock IC, "hour" is output from one output terminal.
The configuration is such that the ``month'', ``day'', or ``minute'', ``month'', and ``day'' information is output by switching.

Of course, switching between the month and day display methods is done by the manufacturer, not the user.

[Brief explanation of the drawing]

Figures 1a, b, and c are electrode pattern diagrams showing display examples of a liquid crystal display timepiece for explaining the present invention, and Figure 2 is the display information of hours, minutes, seconds, and month and day shown in Figure 1. An electrode pattern diagram displayed so that it can be displayed in both domestic and European display systems, FIG. 3 is a partially enlarged view of FIG. 2, and FIG. 4 is a partial circuit block showing an embodiment of an IC for an electronic watch according to the present invention. 5&pbtCed is a liquid crystal display cell pattern diagram showing an example of a liquid crystal display using an IC for an electronic watch according to the present invention. 2... Month display segment, 4... River display segment, 6, 8... Month/day segment,
38...Switching circuit, 40...Switching terminal.

Claims (1)

[Claims] 1 Oscillator circuit, frequency divider circuit, "second" counter, "minute" counter, "hour" counter, "date" counter, "month"
In an electronic watch IC equipped with a counter and configured to output segment drive signals for "month" and "day" at the same time, the output terminal positions of the segment drive signals for "month" and "day" are interchanged. A switching circuit and a switching control terminal for controlling the switching are provided, and the display arrangement of the "month" and "date" can be switched by controlling the control terminal. ■C0 for electronic watches