JPS6345566A - Charging display device - Google Patents

Abstract

PURPOSE:To eliminate the influence of a voltage applied between a charging part and the ground and the size of the area of characters to be displayed by applying a prescribed potential difference between electrodes of a liquid crystal display element (LCD) by a driving device. CONSTITUTION:A charging and noncharging signal at the time of charging and noncharging are obtained by amplifying voltages obtained through the voltage division of electrostatic capacity C'S between a conductor 1 and a current collection plate 3 and electrostatic capacity C'0 between the current collection plate 3 and the ground 2 by an amplifier 5'. A driving control circuit 9 is controlled with the signals to drive the LCD 4 with a character electrode 5 and a common electrode 5'. Consequently, when various electric equipments are in a charging state, a charging display device 7' displays their charging states with characters 'ON'. Consequently, the influence of the voltage applied between the charging part 1 and ground 2 is eliminated, so this is applicable to wide-range voltage classes.

Description

[Detailed Description of the Invention] Industrial Field of Application The present invention is used to determine whether various electrical devices such as transformers, circuit breakers, cable end connections, conductor busbars, and electric wires are energized or not. i! This relates to electric indicators.

2. Description of the Related Art An example of a conventional charge display will be described with reference to FIG. In the figure, 1 is the charging part of the device to be determined whether or not it is in the energized state;
2 is the earth, and 3 and 3° are the current collector plate on the device side and the earth side, which serve as auxiliary electrodes. 4 is a liquid crystal display element (
(hereinafter abbreviated as rLcDJ), the liquid crystal 4° is sandwiched between a character electrode 5 and a common electrode 5°. The current collector plate 3 on the device side and the character electrode 5 are connected, and the current collector plate 3° on the ground side and the common electrode 5′ are connected, respectively.

In the power charging display 7 configured in this way, the charging unit 1 of the device to be discriminated and the current collecting plate 3 on the device side
There is a capacitance Cs between them, a capacitance 1 cfl between the character shape of the LCD 4, the pole 5 and the common electrode 5', and a capacitance ico between the common electrode 5' and the ground 2.

The magnitude of each of these capacitances is given by -a as CM>Cs>C
o. When a voltage ■ is applied between the charging part 1 and the ground 2, a potential difference Vj! between the character electrode 5 of the LCD 4 and the common Ti electrode 5゛! #(Co/CJZ)V occurs. Therefore, if the ratio of Co and 01 is appropriately set, this potential difference v1 will exceed the threshold voltage VJ2 of the LCD 4, and the LCD 4 will display that the device to be determined is in the energized state.

Problems to be Solved by the Invention When the voltage applied between the charging part 1 and the ground 2 is low, or when the area of the displayed characters is increased to make them easier to see, the area required for display increases, and the current flowing therein also increases. Because it is thick, it is necessary to provide a large current collector plate in order to display it using the conventional method, which makes it almost impractical.

Means for solving the problem The voltage always occurs between the character electrode 5 of the LCD 4 and the common electrode 5°, regardless of the voltage applied between the charging part 1 and the ground 2 or the size of the character area to be displayed. The potential difference is set by the driver to exceed the display voltage threshold.

Operation and Embodiment FIG. 1 shows an embodiment of the present invention, FIG. 2 shows a basic driving circuit of the LCD 4, and FIG. 3 shows a driving waveform of the LCD 4. Components corresponding to those in FIG. 4 showing a conventional configuration example are given the same reference numerals, and redundant explanations will be omitted.

In the embodiment shown in FIG. 1, the LCD 4, current collector plate 3, and drive device 8 are housed in a common case 7a, and necessary parts are sealed with resin to prevent the influence of outside air and internal short circuits. . Instead of housing them in a common case 7a, the LCD 4 and the current collector plate 3 are integrated and the necessary parts are sealed with resin, and the power supply display 7' and the drive device 8, which is separately sealed with resin, are connected via lead wires 13. You may also connect from

The drive device 8 includes a drive control circuit 9, a rectangular wave oscillation circuit 110, and its electric power! 12 (for example, a solar cell or a rechargeable battery), an amplifier 11, and the like. An LCD 4 having character electrodes 5 and a common electrode 5' is driven by a driving device 8. The basic drive control circuit 9 is shown in FIG. 2, and the drive waveform is shown in FIG.

The drive control circuit 9 has two exclusive OR gates 13 and π/
It is composed of a two-phase control circuit 14. Square wave oscillation circuit 1
A rectangular wave from 0 is applied to one gate input of the two-man exclusive OR gate 13 and the common electrode 5' of the LCD 4, and to the other gate input via the π/2 phase control circuit 14. The output of the two-man exclusive OR gate is applied to the character electrode 5. Third
As shown in the figure, the square wave power input to the two-man exclusive OR gate 13 corresponds to 1' (charged) and "0" (not charged) of the charged and non-charged signals <s. The phase of V,,V2 is 90
The voltage between the two electrodes of the LCD 4 is controlled by the π/2 phase control circuit 14 so as to have a phase shift of 0.degree. or the same phase. The vJA voltage and the energized and unenergized signal (s) when no energization is applied are partially determined by the capacitance Cs' between the conductor 1 and the current collector plate 3, and the capacitance Co' between the charging part 1 and the ground 2. The voltage to be
Amplifier 11 amplifies and obtains the signal. The drive control circuit 9 is controlled by this signal, and a drive waveform is applied to the LCD 4.

In this way, if the various electrical devices are in the power charging state, the power charging display 7° displays the power charging state, for example, with the characters "ON".

Effects of the Invention According to the present invention, it is not affected by the voltage applied between the charging part 1 and the ground 2, so it can be applied to a wide range of voltage classes. Furthermore, since the size of the characters to be displayed can be freely selected, it is possible to provide an easy-to-read power charging display.

[Brief explanation of drawings]

Fig. 1 is a detailed explanatory diagram of the present invention, Fig. 2 is a basic drive control circuit diagram of the LCD 4, and Fig. 3 is a diagram of the basic drive control circuit of the LCD 4.
FIG. 4 is a diagram showing a conventional example. In the figure, 3.3' is a current collector plate 4, a liquid crystal display element (LCD), 5 is a letter electrode, 5' is a common electrode, 7.7' is a power display, and 7'' is a case 8, which is a drive device.Patent applicant Takatake Seisakusho Co., Ltd. Naked L Tou 2 Exit 3rd Exit

Claims (1)

[Claims] Liquid crystal display element, current collector plate and its drive A power display consisting of a drive device for Then, connect the character electrode of the liquid crystal display element and the common voltage. Connect the pole to the drive device and connect the voltage of the liquid crystal display element. If the display voltage threshold is exceeded between the poles, The potential difference is set to be applied by the drive device. A power charging indicator characterized by: