Video display appliance including device for eliminating radiation wave

Abstract

A video display appliance having a device for eliminating the radiation wave emitted from a cathode ray tube. The appliance includes a shielding wire wound one to several times along the periphery of a degaussing coil. The pulses having the same level and phase, but inverse polarity to those applied to an anode of the cathode ray tube, is applied to the shielding wire, thereby offsetting the radiation wave emitted from the cathode ray tube.

Description

technical field [0001] This invention relates to video display devices, such as television receivers, computer monitors, etc., and more particularly to video display devices including means for canceling the electric fields emitted by cathode ray tubes. Background technique [0002] Commonly used video display devices include a cathode ray tube (CRT), a cabinet, and a back cover. The case and back cover are made of thermoplastic material that is bonded together to house the CRT. The inside of the CRT is a high vacuum and includes a funnel-shaped bulb with a screen and a neck, an electron gun mounted on the neck of the bulb for emitting electron beams, and a deflection device mounted outside the neck. [0003] In a cathode ray tube such as the one described above, the electron beams emitted from the cathodes of the electron guns are controlled and accelerated by conventional means so as to strike the phosphors located on the back of the screen. In this process, the horizont...

AI Technical Summary

Problems solved by technology

However, such panels require expensive special processing and are difficult to mass produce

Due to this shielding plate, the transmission performance of the CRT monitor is reduced, so the brightness of the monitor is reduced

In addition, since the shielding plate is made of glass, when the shielding plate is mounted on the front of the CRT, the operator will experience visual fatigue due to the reflection of the glass plate

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