JPS5848698Y2 - Composite display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composite display device that can display different forms of display on the same display body.

In recent years, small electronic devices such as electronic desktop calculators and electronic clocks have been used to memorize various items necessary in daily life, such as telephone numbers, timetables and schedules for vehicles, etc. There is a growing trend to call up the above data at any time and use it as a simple memo, or to display patterns other than numbers, such as symbols and alphabets, as comments on the displayed numerical data.

In response to this trend, portable electronic devices such as calculators are unable to meet the above demands because they are display devices that only display numbers consisting of 7 segments. However, there was a problem in that even overly complex display devices could not be used.

The present invention was developed in view of the above-mentioned problems with conventional display devices, and it improves the display function by displaying only some of the digits in a display device consisting of multiple digits with a more complicated segment structure. The aim is to expand.

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

FIG. 1 shows a display device made of a liquid crystal, electrochromic, electroluminescent, or fluorescent display tube, and FIG. 2 shows the display device displaying alphabets and numbers.

The display device of this embodiment is made of, for example, a liquid crystal display.
Equipped with 6 digits S1 to S16 display digits, upper 6 digits S1 to S
Each digit of 6 can be displayed as an alphabet.
It is composed of 13 segments, and each of the lower 10 digits S7 to S16 is structured in the form of a 7-segment character, similar to the conventional device.

Note that the upper 6 digits are not limited to 13 segments, and can be configured with a display with a larger number of segments or a dot matrix type display, and the lower 10 digits can also be configured with other numbers of segments. be able to.

The display body S1 to S6 consisting of the 13 segments has two first and second common electrodes Xi1.
X12 (i = 1 to 6) is provided, and the first common electrode Xi
1 has 8 segments) ai to a8 facing each other, and a second electrode
i2 is provided with five segments b1 to b5 facing each other.

Common electrode Xi1. Xi2 is supplied with a data signal for display, segment electrodes a1-a8, b1-b5 are supplied with scanning signals, and, for example, common electrodes Xi1. To Xi2-
■A signal of 1 volt is given, and the segment electrodes a1 to a
8. With the +2 volt signal being applied to bl to b5, the segment electrode section to which the +V2 volt signal is applied is driven for display.

Segment electrode group b1 facing the second common electrode Xi2~
b5 represents segment electrodes a1 to a facing the first common electrode Xi1.

They are connected one-to-one to each other and are commonly scanned by a given timing signal.

Regarding the display bodies S7 to S1E, one common electrode Xj (j=7 to 16) is provided as in the conventional device, and the common electrode Xj has 8 segments C including the decimal point segment C8.
1 to C8 are provided facing each other.

FIG. 4 is a block diagram showing a drive circuit for the display device.

In the figure, reference numeral 1 denotes a latch circuit for selecting segment electrodes of each of the display bodies S1 to S16, to which a 4-bit BCD code is applied from the display control circuit of the main body of the electronic device via the data bus line.

The most significant bit of the 4-bit signal is a signal Q that controls whether the voltage applied to the segment electrode is positive or negative, and is output from the latch circuit 1 to the level conversion circuit 2.

That is, when the signal Q is at logic 1, +2 volts are output, and when it is at logic 0, -v2 volts are output and supplied to the C0M terminal of the analog multiplexer 3 connected to the next stage.

The analog multiplexer 3 is supplied with the remaining 3 bits of the latch circuit 1, and it decodes the BCD code signal and outputs the level conversion signal 2 supplied to the C0M terminal to the decoded line from among the 8 segment electrodes.
A positive or negative voltage is applied from the display device 4 to the corresponding segment electrodes as scanning signals Y1 to Y8.

In this embodiment, since a liquid crystal is used as a display, the scanning signals Y1 to Y8 are set to the fifth scanning signal so that a DC bias voltage is not applied to the liquid crystal after one cycle for dynamically driving the display device is completed. As shown in the figure +
V2 volts and -■2 volts are applied alternately.

On the other hand, the data signal supplied to the common electrode side of each display body is applied from the common electrode signal generation circuit 5 to the common electrode of the corresponding display body.

The common electrode signal generation circuit is composed of a shift register and a latch circuit, and the display stage is composed of a display control circuit (not shown).
1.1. + ■ Lebel signals are sequentially input to the shift register.

Since 22 common electrodes are provided in this embodiment, the capacitor for storing the data signal of the shift register has at least 22 bits.

A clock signal for sequentially shifting the data signal inputted to the e terminal one bit at a time is applied to the f terminal.

The data signals stored in the shift register are transferred all at once to latch circuits connected in parallel to each bit of the shift register at a predetermined timing.

The transfer timing is controlled by a transfer command signal applied to the g terminal, and the transfer command signal is formed at a change point of the scanning signal Yi-1 to transfer the contents of the register to the latch circuit.

The data signal transferred to the latch circuit is in a state where a signal of a predetermined level is applied to each of the 22 common electrodes according to the data storage, and a scanning signal Yi at the next timing that formed the transfer command signal is applied. For the voltage force between the two poles, v1[+
The segment portion that has reached 7v21 operates to display.

Next, the operation will be explained by citing the case where the display shown in FIG. 3 is performed.

The display data is input manually from the display control circuit to the e terminal for each segment electrode from the first segment electrode to the eighth segment electrode in units of 22-bit signals corresponding to the 22 common electrodes, and converted to a predetermined level. is stored in a 22-bit shift register.

For example, when scanning the first segment electrode of each common electrode with the scanning signal Y1, the 22 common electrodes of the shift register are scanned at a stage before the scanning signal Y0 is applied, that is, at the timing of the scanning signal Y8. For the electrode,
A logic 0 is placed on the common electrode that requires the display of the first segment.
A logic 1 has already been applied to the common electrode, which is not required for the display of the first segment.

That is, the register has the first . Data 110010... are transferred and stored in correspondence with the second common electrode.

While stored in the register, when the scanning signal Y8 changes and the next scanning signal Y1 is applied, a change point is detected, a transfer command signal is input to the g terminal, and the contents of the register are transferred all at once to the latch circuit. Ru.

The device housed in the latch circuit applies a voltage of a predetermined level to the common electrode of each display body, and at the timing when the scanning signal Y1 is input, 1v,j+FV2f of the first segment electrodes belonging to each common electrode. The segment section to which the voltage is applied is operated for display.

Similarly, data to be displayed by the scanning signal Yn at the time of the scanning signal Yn-1 is transferred in advance to the register and stored in the register,
A display state is obtained by outputting a scanning signal Yn.

Although the above embodiments use liquid crystal, other display bodies can be used, and the drive circuit for the display body is not limited to the above embodiments.

As described above, according to the present invention, in a display device consisting of multiple digits, by configuring some of the display digits into a display body that can display alphabets and symbols, it is possible to display a richer amount of information using the same display body. This allows the functionality of the display device to be significantly improved.

In addition, for a display with a large number of segments, the common electrode is divided into two or more, and the entire display is time-divisionally driven using the same scanning lines as for a display with a small number of segments.
There is an advantage that the number of scanning lines for driving can be reduced and the display can be driven by the same driving circuit.

[Brief explanation of drawings]

Fig. 1 is a diagram showing an embodiment of the display device according to the present invention, Fig. 2 is a diagram showing the display state of the display device, Fig. 3 is an enlarged view of the main part of the display device, and Fig. 4 is the same display. FIG. 5 is a block diagram showing the drive circuit of the device, and a signal waveform diagram for explaining the operation of the drive circuit. S1 to S16: display body, Xil, Xj2. Xj: common electrode, a1 to a8. b1-b5. C1 to C8: segment electrodes.

Claims (1)

[Scope of utility model registration request] In a display device consisting of multiple digits, a display body with a large number of segments is arranged in some display digits belonging to the same display device, and a display body with a small number of segments is arranged in other display bodies, and a display body with a large number of segments is arranged. divides the common electrode into two or more parts,
A composite display device characterized in that the entire display is driven once per hour in the same way as the scanning lines of a display body with a small number of segments.