| 摘要 |
PURPOSE:To suppress electromagnetic wave leaking from a display device without impairing its resolution and image quality by providing an impedance matching resistance and a filter circuit for cutting off high frequency band without grounding portion, at the picture signal input stage of a picture amplifier. CONSTITUTION:A display device is provided with a filter 6 for cutting high frequency band, which is provided at the picture signal input stage of a picture amplifier 5 and in which an grounding portion is not included, and an impedance matching circuit 4 provided at the front stage of the filter 6. The filter 6 for cutting off high frequency band is, for example, an LC parallel resonance type filter and not provided with the grounding portion. Accordingly, since the impedance on a signal source side becomes infinite near a resonance point, impedance matching is not disturbed by the circuit for impedance matching 4 provided on the front stage. Thus only unnecessary high frequency band component of image signal from the signal source is damped without any disturbance to suppress reflection of electromagnetic wave from the image amplifier 5 without reducing its resolution and image quality of the display device. |
