JPS58147783A - Liquid crystal display - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] The present invention relates to a liquid crystal display device with a novel structure.

Conventionally, liquid crystal display devices have been electrically connected to an external circuit that provides display signals, and generally a conductive rubber connector or the like is interposed at the connection point to make the device relatively firmly fixed. It was not possible to easily attach and detach the liquid crystal display device.

The present invention provides a connection form that is completely different in concept from the connection form of conventional liquid crystal display devices, and by transmitting signals from the external circuit to the liquid crystal display device by magnetic means, An object of the present invention is to provide a device in which electrical contact between a liquid crystal display device and a liquid crystal display device is made substantially contactless.

Hereinafter, one embodiment of a liquid crystal display device according to the present invention will be described in detail using the drawings.

FIG. 1 shows a plan view of an embodiment of a liquid crystal display device according to the present invention, and FIG. 2 shows an explanatory diagram of its circuit. In FIG. 1, reference numeral 1 indicates a liquid crystal cell, 2 indicates a solar cell, and three or more Hall elements. The solar cell 2 and the Hall element 3 are formed on an extended portion of one substrate of the liquid crystal cell 1. Also, solar cell 2
The Hall element 3 and the electrode of the liquid crystal cell 1 are connected by a lead wire (not shown). This connection is made by depositing a conductive material on the substrate in a predetermined pattern by sputtering, vapor deposition, etching, or the like.

This connection wiring is as shown in FIG. 2, in which the solar cell 2 and the Hall element 3 are connected in parallel, and the output terminal of the Hall element 3 and the electrode of the liquid crystal cell 1 are connected. solar cell 2
A capacitor 5 connected in parallel with is provided to stabilize the output voltage of the solar cell 2. In the figure, the Hall element 3 is shown as a three-terminal type, but it may be of a four-terminal type or a five-terminal type. As is well-known, a Hall element is an element that generates a voltage in a direction perpendicular to the current and magnetic field when a current is applied to the element and a magnetic field is applied in a direction perpendicular to the current direction.The generated voltage V is V=R・BI /d(R:
Hall coefficient, B: magnetic flux density, I: current, d: thickness of element). Since a current is constantly applied to the Hall element 3 of FIG. 1 than the solar cell 2, when a magnetic field is applied to the Hall element 3 from the outside, the Hall element 3 generates a predetermined output voltage. Therefore, this output voltage turns on the liquid crystal display device. In FIG. 1, reference numeral 4 denotes a connecting portion for an external circuit, and a magnetic head is provided at the connecting portion at a position corresponding to the Hall element 3.

By appropriately changing the magnetic field generated by the magnetic head over time, it is possible to change the electric signal applied to the electrodes of the liquid crystal cell 1 via the Hall element 3, so that any desired display can be performed in the liquid crystal cell.

The light supplied to the solar cell 2 may be external light,
Further, a predetermined light may be inputted from the connecting portion 4. Furthermore, both may be performed.

According to the present invention described above, since the signal transmission between the liquid crystal display device and the external circuit is carried out by magnetic means, the liquid crystal display device can be easily attached and detached, and various types can be attached to the same circuit board. It is also possible to easily replace the liquid crystal display device of this type.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of a liquid crystal display device according to the present invention, and FIG. 2 is an explanatory diagram of its circuit. In the figure, 1: Liquid crystal cell 2: Solar cell 3: Hall element 4: Connection part 5: Capacitor

Claims (1)

[Claims] 1. A liquid crystal cell, a solar cell, and a Hall element are provided on the same substrate, a means for applying a current generated in the solar cell to the Hall element, and a means for applying a voltage generated in the Hall element to the liquid crystal cell. A liquid crystal display device comprising: