JPS6321569A - Loaded power display - Google Patents

Abstract

PURPOSE:To achieve a higher reliability while eliminating a lead wire, by forming a transparent conducting layer on a surface where a polarizing film of a substrate with a transparent electrodes sandwiching a liquid crystal is to be applied. CONSTITUTION:When a transparent conducting layer 5a and a current collector 3 on the side of an equipment are arranged tight through a polarizing film 4b with a reflector, the polarizing film 4b is so thin that a large electrostatic capacitance C35 is generated therebetween to allow the passage of an AC electricity between the transparent conducting layer 5 and the current collector 3 on the side of the equipment. This can yield the results the same as obtained by the connection with a lead simply and setting a conducting plate 3 on the side of an equipment using a liquid crystal display element 14.

Description

[Detailed Description of the Invention] Industrial Application Field The present invention detects the electric field strength near the live parts of various electrical equipment such as transformers, circuit breakers, cable end connections, conductor busbars, and electric wires. This invention relates to a power charging indicator that determines whether or not it is in a powered state.

Conventional technology An example of a conventional charging display is shown in 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 ground, 3 is the device side current collector plate, 3'' is the ground side current collector plate. 4 is the liquid crystal display element, This consists of a liquid crystal 4' and two glass or plastic substrates 4a and 4 that sandwich it.
a', polarizing films 4b and 4b' with reflective plates provided on each outside thereof, and a transparent electrode 5.5°. Lead wires 6 and 6' connect the device-side current collector plate 3 and the transparent electrode 5, and the earth-side current collector plate 3' and the transparent electrode 5°, respectively.

Now, when voltage V is applied between charging part 1 and earth 2,
Due to the electric field near the charging part 1, a potential difference (2) exceeding the display voltage threshold Vt of the liquid crystal display element 4 is generated between the two transparent electrodes 5.5 degrees of the liquid crystal display element 4, and the target device is damaged! Displays fog status. The ground side current collector plate 3° has a transparent window (not shown) in the center, and the display can be seen through this window.

Problems to be Solved by the Invention A voltage indicator is a device that indicates the presence or absence of voltage to improve the safety of work involving high voltage. Therefore, this display device itself is required to be trouble-free and highly reliable. To this end, it is effective to reduce the number of components by even one.

Means for Solving the Problems The key point of the present invention is to improve the structure of the liquid crystal display element and to remove the lead wires 6 and 6'' shown in FIG. 3 from the structure of the conventional power supply display. The main improvement of the R5 crystal display element is that a transparent conductive layer is formed on the surface to which the polarizing film is attached of the substrate with transparent electrodes sandwiching the liquid crystal.

Operation and Embodiment FIG. 1 shows an embodiment of the present invention, and components corresponding to those of the conventional example shown in FIG. 3 are given the same reference numerals, and redundant explanations will be omitted. The liquid crystal display element 14 is provided with a transparent conductive layer 5a on the entire surface of the substrate 4a opposite to the transparent electrode 5, and the transparent electrode 5 and the transparent conductor N5a are conductive parts formed on a part of the side surface of the substrate 4a. 5b. Further, a transparent conductive layer 5a' is applied to the entire surface of the transparent electrode 5' on the opposite side of the liquid crystal 4' so as to sandwich the substrate 4a'.
They are connected at the conductive portion 5b° on the side surface of a'. Further, the thicknesses of the polarizing film 4b with a reflective plate and the polarizing film 4b' provided on the outer surfaces of the transparent conductive layers 5a and 5a' are approximately 0.25 mm and 0.15 mm, respectively.

The main difference between the liquid crystal display element 14 used in the present invention and the conventional liquid crystal display element 4 is that the transparent conductive layers 5a and 5a'
It is to have. When the transparent conductive N 5 a and the device-side current collector plate 3 are placed in close contact with each other via the polarizing film 4b with a reflective plate, a large capacitance Css is generated between them because the polarized light pA4b with a reflective plate is very thin. Capacitance CS
By S, electricity can be reliably passed between the transparent conductive layer 5a and the device-side current collector plate 3. Therefore, by using the liquid crystal display element 14 of the present invention and simply placing the device-side current collector plate 3 in close contact with the polarizing film 4b with a reflective plate, the third plate can be connected between the transparent electrode 5 and the three device-side current collector plates. The relationship between the ground side current collector plate 3° and the transparent conductor 8i5°, which produces the same result as the connection with the lead wire 6 in , is also the same, and electricity can be conducted by the capacitance CSS° between them. Therefore, it is clear that the power charging display of this embodiment has the same electrical function as the conventional power charging display shown in FIG.

Although this embodiment shows a case in which the transparent conductive layer is provided on the entire surface of two substrates, it is not necessarily necessary to provide the transparent conductive layer on the entire surface, but it is sufficient to provide the transparent conductive layer to the extent that the above effect is produced.

FIG. 2 shows another embodiment of the transparent electrode 5 in the first embodiment.
Display pattern electrode 15, transparent electrode 5', common electrode 1
5', and in FIG. 1, the common electrode 15' generally has a large area and conducts electricity through the capacitance C1 formed between the substrate 4a' and the current collector plate 3' via the polarizing film 4b'. Can pass. However, between the display pattern electrode 15 and the device-side current collector plate 3, the display cannot be displayed unless the display pattern electrode 15 and the device-side current collector plate 3 are brought into direct contact or a transparent conductor f'J 5 a connected through the conductive part 5b is formed. 8i15
Since the area of
The capacitance between the end plate 3 on the device side and the end plate 3 on the equipment side becomes larger,
This is because electricity flows directly from the common electrode 15° to the device side current collector plate 3. In this way, the transparent conductive layer 5a'
may not necessarily be formed.

Effects of the Invention Since the present invention removes the lead wires 6 and 6° from the conventional power supply display configuration shown in FIG. 3, the following problems that were considered in the configuration of FIG. 2 do not occur.

Breakage of lead wires 6 and 6' Contact failure at both ends of lead wires 6 and 6' Contact of lead wire 6 to earth side current collector plate 3' Contact of lead wire 6° to device side current collector plate 3 The present invention In this way, the simpler configuration eliminates the concerns that may arise during long-term use, making it possible to produce a power-on display with higher reliability, and as a result, it is possible to produce a power-on display with higher reliability. You can improve your work.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, FIG. 2 is a diagram showing another embodiment of the invention, and FIG. 3 is a diagram for explaining a conventional technique. In the figure, reference numeral 1 indicates a charging section 4° is a liquid crystal 4a, 4a' is a substrate 4b, 4b' is a polarizing film 5.5° is a transparent electrode 5a, and 5a' is a transparent conductive layer 14 which is a liquid crystal display element. Patent Applicant: Takatake Seisakusho Co., Ltd. Kaya 10th Edition 1 smoked

Claims (1)

[Scope of Claims] A charging display using a liquid crystal display element configured by two transparent electrodes sandwiching a liquid crystal, and a polarizing film attached to the outside of each of the two substrates to which the transparent electrodes are attached. In a liquid crystal display element, a transparent conductive layer is formed on the surface of at least one of the substrates to which a polarizing film is pasted, and a potential difference is generated between two transparent electrodes of the liquid crystal display element by an electric field near a charged part when electricity is applied. is set to exceed a display voltage threshold.