Patent ID: 6160364
Filing Date: 2000-12-12
Classification: G09G,H03K,H04N

Abstract:
A circuit for limiting horizontal image size of a display comprising:a horizontal driver for amplifying and outputting horizontal pulse signals;PWM control means for producing PWM signals for adjustment of the horizontal image size of the display;horizontal output power supply means that uses a transistor switch and is connected to said PWM control means for supplying driving power in response to the PWM signals outputted from the PWM control means;horizontal output means connected to said horizontal output power supply means for controlling horizontal deflection of an electron beam in accordance with the driving power supplied by the horizontal output power supply means, said horizontal output means being driven in response to the horizontal pulse signals from the horizontal driver; anda current mirror circuit connected between said transistor switch of said horizontal output power supply means and a feedback input of said PWM control means for detecting signals indicative of the horizontal image size of the display, and for feeding the detected signals back to the feedback input of said PWM control means.