JPS6070478A - Electronic appliance - 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 an electronic device equipped with a liquid crystal display, and more particularly to an electronic device equipped with a liquid crystal display that prevents malfunctions caused by static electricity.

In recent years, there has been a growing demand for compact and low-cost electronic devices. For this reason, low-cost, low-power consumption liquid crystal displays are used as display media for various electronic devices.

Desktop calculators and wristwatches have so far been known as electronic devices that use liquid crystal displays.

For example, as shown in FIG. 1, a conventional desktop calculator has printed boards 13 and 14 connected by jumper lead wires (not shown) inside an upper case 11 and a lower case 12, and terminals ( (not shown), l! : A conductive rubber member 16 for terminal connection is arranged between the terminal parts (not shown) of the liquid crystal display part 15, and a spacer member 1 is further placed above the liquid crystal display part 15.
It has a structure in which a polarizing plate 18 and a conductive rubber key 10 are arranged through a polarizer 7. An aluminum reflector (not shown) with a polarizing plate pasted 9 is disposed below the liquid crystal display 15, and by applying a predetermined electric signal to the liquid crystal display 15, the display operation can be viewed in reflective mode. Can be done.

In order to achieve a low cost and compact structure, these desktop calculators have small LSI (Large Scale Integrated Circuit) circuits and chip sizes, and to this end, eliminate unnecessary circuits as much as possible, thereby reducing the risk of damage from the human body, etc. The generated static electricity may cause paper malfunctions. In the patent, in a device in which display data is displayed and output via a display buffer constituted by a RAM (Random Access Memory), the display data may change due to static electricity. For this reason, in conventional desktop calculators and the like, a method has been adopted in which a noise plate 19 is provided below the printed board 14, as shown in FIG. 1, to prevent the above-mentioned malfunctions.

However, even if such a noise plate 1q is used, it is difficult to sufficiently prevent malfunctions caused by static electricity, especially when using an LSI that eliminates as many unnecessary circuits as possible. was not at all sufficient.

An object of the present invention is to provide a means for preventing malfunctions caused by static electricity, which is suitable for electronic equipment having a low cost and compact design.

This object of the present invention is achieved by using a liquid crystal display in which a conductive member for ground connection is disposed between the liquid crystal display section and the polarizing plate.

As the conductive member for ground connection used in the present invention, a frame-shaped member molded from a metal such as aluminum, copper, or methineless is suitable, and the frame-shaped member is a spacer that maintains a constant distance between the liquid crystal display section and the polarizing plate. It can have the function of

The present invention will be explained below with reference to the drawings.

FIG. 2 is a perspective view of a liquid crystal display used in electronic equipment. The liquid crystal display shown in FIG. This is more effective as the shielding distance is shorter, and by making the above-mentioned conductive member 21 for ground connection function both as a spacer and as a shield plate,
The distance can be minimized when shielding the liquid crystal display.

Another polarizing plate (not shown) is arranged below the liquid crystal display section 15, and further below that, a light diffusing aluminum reflecting plate (not shown) is arranged. The liquid crystal display section 15 is composed of a pair of electrode plates and a liquid crystal material sandwiched between the pair of electrode plates, and this liquid crystal material uses a twisted nematic liquid crystal mode (TN mode). However, other liquid crystal modes such as guest-host liquid crystal mode, dynamic scattering mode and cholesteric-nematic phase transition mode can also be used.

By loading such a liquid crystal display into a desktop calculator as shown in FIG. 1, malfunctions due to static electricity generated by contact with a human body or the like can be sufficiently prevented. At this time, since the use of the noise plate 19 shown in FIG. 1 can be omitted, the number of parts can be reduced, making it possible to create a more compact and low-cost desk-top bar quadrature calculator.

In addition, in the electronic device of the present invention, the conductive member for ground connection 21 has a spacer function to maintain a constant distance between the polarizing plate 18 and the liquid crystal display 15, so that the problem that occurs when such a spacer is not available. Newton's rings can also be prevented.

According to the present invention, malfunctions due to static electricity can be prevented even when an LSI with a simple circuit configuration is used, and the number of parts can be reduced, so it is possible to provide a low-cost and compact electronic device. It has the advantage of being able to

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional desktop calculator. FIG. 2 is a perspective view of a liquid crystal display used in the electronic device of the present invention. 11. Case 12. Lower case 1!1
, 14... Printed board 15... Liquid crystal display section 16... Conductive rubber member for terminal connection 18...
Polarizing plate 21... Conductive member for ground connection 22... Jumper wire Patent applicant Canon Co., Ltd.

Claims (1)

Claims: (1) An electronic device including a liquid crystal display having a liquid crystal display section and a polarizing plate, characterized in that an electrically conductive member for ground connection is provided between the liquid crystal display section and the polarizing plate. (2) The electronic device according to claim 1, wherein the connecting conductive member has a function of holding the liquid crystal display section and the polarizing plate at a constant distance. (5) The electronic device according to claim 1 or 2, wherein the connection conductor member has a frame-like shape.