JPS6215835B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to time display devices such as timers and clocks.

Conventionally, analog display devices have been used as timer or clock display devices that display multiple unit display sections individually or cumulatively, but these drive circuits are generally complex, and there is a The disadvantage was that the number of wirings increased.

Therefore, the present invention provides a plurality of segment electrodes facing both a common electrode and a plurality of selection electrodes via a liquid crystal, makes the facing area of each segment electrode corresponding to each selection electrode equal, and each segment electrode facing a selection electrode The above drawbacks are eliminated by making the common electrodes of the segment electrodes and the common electrode different from each other, applying a variable drive signal between each selection electrode and the common electrode, and sequentially displaying an integrated display on each display section corresponding to each selection electrode. This is what I did.

An embodiment of the present invention is shown in the drawings below.

In FIG. 1, reference numerals 1 to 4 indicate selection electrodes that are insulated from each other, and corresponding to each selection electrode, common electrodes 5a to 5 are formed in a step shape.
d is arranged. The common electrodes 5a to 5d are electrically conductively coupled to each other at coupling portions 6a to 6c. 7
26 are segment electrodes facing the selection electrodes 1 to 4 and the common electrodes 5a to 5d. In this example, when the opposing area of the segment electrodes 7 to 26 facing the selection electrodes 1 to 4 is "24", the opposing area of the segment electrodes 7 to 11 facing the common electrode 5a is sequentially "56" from the left in the drawing. ”, “26”, “14”, “8.4” and “5.5”. The same applies to the opposing areas of the common electrodes 5b to 5d and the segment electrodes 12 to 26.

FIG. 2 shows a drive circuit that applies a drive signal to the display section shown in the first figure. 27 is a step counter in quinary, and 28 is a step counter in hexadecimal. When a pulse is input, terminals a ₁ to a ₄ , a ₀ and terminals b ₁ to
A high potential output is generated sequentially at b ₄ and b ₀ . In the above, the step counters 27 and 28 constitute a timekeeping circuit. Reference numeral 29 represents a time signal generating circuit, which generates a pulse with a cycle of, for example, 1 second. 30-40 are output transistors. 41 to 46 are resistances,
500KΩ, 344KΩ, 216KΩ, 122KΩ, respectively
It has a resistance value of 60KΩ and 100KΩ. 47~
47 is a resistor, and its resistance value is 10MΩ.
48 is a DC power supply, which is set to 12 volts. In the above, the output transistors 30 to 4
0, resistors 41 to 47, and DC power supply 48 constitute an output circuit.

Next, the operation of displaying information as time passes will be explained. Step counters 27 and 28
Assuming that is cleared, the level of terminals a ₀ and b ₀ becomes high potential, and transistors 34 and 35 are turned on. Therefore, the terminal c ₁ shown in the second diagram
and c ₀ , that is, 2 volts are generated between the first illustrated terminals c ₀ and c ₁ . This voltage is applied between the selection electrode 1 and the common electrode 5a. A capacitor is formed between the segment electrode, the common electrode, and the selection electrode, and the equivalent circuit thereof is shown in FIG. The capacitors 7A to 11A have a capacitance between each of the segment electrodes 7 to 11 shown in the first diagram and the selection electrode 1, and the capacitors 7B to 11B have a capacitance between each of the segment electrodes 7 to 11 and the common electrode 5a. Since the capacitance of a capacitor is proportional to the area of the opposing electrodes, in FIG. The area is "56", therefore the third
If the voltage applied between terminals c ₀ and c ₁ shown in the figure is V, capacitor 7A has 56/80V, capacitor 7B
A voltage of 24/86V is applied to.

Similarly, capacitors 8A to 11A are
26/50V, 14/38V, 8.4/32 respectively.
4V and 5.5/29.5V, 24/50V and 2V to capacitors 8B to 11B, respectively.
4/38V, 24/32.4V and 24/29.5V are applied.

Now, since 2 volts are generated between the terminals c ₁ and c ₀ mentioned above, a response voltage of 1.4 volts is applied to capacitor 7A, and a voltage lower than the response voltage is applied to the other capacitors 8A to 11A. .

The display section corresponding to the segment electrode 7 facing the selection electrode 1 is then turned on.

Next, when a 1-second pulse is generated from the time signal generation circuit 29, the step counter 27 counts "1", the terminal _a1 becomes a high potential, and a voltage is generated between the terminals _c1 and _c0 .
2.7 volts are produced. Therefore, a response voltage higher than the response voltage is applied to the capacitor 7A shown in the third diagram, and a response voltage is applied to the capacitor 8A. As a result, the display portions corresponding to the segment electrodes 7 and 8 facing the common electrode 1 are lit.

Thereafter, every time a 1 second pulse is generated from the time signal generating circuit 29, the terminals a ₂ , a ₃ and a ₄ become high potential in sequence, and the segment electrode 9 facing the common electrode 1
-11 corresponding display sections are sequentially and cumulatively lit.
Further, when a carry pulse is generated in the step counter 27, a high potential is generated at the terminal _b1 of the step counter 28, and a voltage is generated between the terminals _c2 and _c0 . As a result, the display portions corresponding to the segment electrodes 7 to 11 light up, and integrated lighting starts again from the segment electrode 12. After the display portions of the five segment electrodes are lit in an integrated manner in this manner, the next five segment electrodes are sequentially lit in an integrated manner.

For example, in addition to displaying elapsed time for competitions, this example
If Fig. 1 is arranged in a circle and the lights are displayed for 60 seconds, it can also be used as an analog display for a clock.

As described in detail above, the present invention has a plurality of segment electrodes facing each of the common electrode and the selection electrode via the liquid crystal, making the facing areas of the segment electrodes facing the selection electrode equal, and the plurality of segment electrodes facing the selection electrode The opposing areas of the segment electrodes and the common electrodes are made different, and the display section for each selected electrode of the display section whose constituent elements are the common electrode and each segment electrode facing the common electrode is illuminated cumulatively. This is what I did. Therefore, since at least one of the amplitude, pulse width, and period of the drive signal is simply changed without requiring a circuit to select each display section, the circuit configuration is extremely simple. Furthermore, since the wiring is between the common electrode and the selection electrode, the number of lead wires can be reduced. For example, if the number of selection electrodes is 12, the number of common electrodes is 1, and the number of segment electrodes is 60, and 60 display parts are configured,
The number of lead wires connected to the electrodes is 13. However, if you try to light up 60 display units using conventional multiplex drive, you will need at least 16 lights. In this way, the number of lead wires is small.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a plan view of an electrode pattern, FIG. 2 is a drive circuit diagram shown in the first diagram, and FIG. 3 is an equivalent circuit diagram of the first diagram. 1-4...Selection electrode, 5a-5d...Common electrode, 7
~26...Segment electrode, 27~28...Step counter.

Claims (1)

[Claims] 1 Selection electrodes are sequentially arranged without facing the electrode surface of the common electrode, and a plurality of segment electrodes are arranged facing each other through a liquid crystal on the electrode surface of each selection electrode and the common electrode, and each segment electrode corresponds to the electrode surface of the common electrode. The display section is constructed by making the facing area of each selection electrode and each segment electrode equal, and the facing area of each segment electrode facing a predetermined selection electrode and the common electrode being different, and a time measurement circuit is provided. , an output circuit that selects a selected electrode by the output of each digit of this timekeeping circuit, and changes at least one of the amplitude, pulse width, and period of a time signal generated at predetermined time intervals for each digit each time the time signal is generated. A time display device having an output circuit and applying an output of the output circuit between a selection electrode and a common electrode.