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1. 发明授权

US4649325A Scanning CRT control system 失效
标题翻译：扫描CRT控制系统
公开(公告)号：US4649325A
公开(公告)日：1987-03-10
申请号：US820778
申请日：1986-01-21
申请人： Thomas R. Guerin , Theodore V. Lester
发明人： Thomas R. Guerin , Theodore V. Lester
IPC分类号： H04N3/237 , H01J29/52
CPC分类号： H04N3/237
摘要： A scanning CRT control system is disclosed in which horizontal sync pulses are used to develop a pulse signal that provides an input to a transformer circuit also receiving a relatively low DC power supply input signal. The transformer circuit develops a very high DC voltage connected to a CRT screen while also providing a relatively lower voltage power supply signal that is utilized to develop the power supply signal provided to a video driver that controls beam excitation for the CRT. A compensation circuit is provided between the transformer circuit and a power supply terminal of the video driver such that a compensating signal is provided at the transformer circuit in accordance with each horizontal video scan line. The compensating signal has a frequency corresponding to the horizontal sweep frequency and a magnitude that varies in accordance with the average current loading of each individual horizontal scan line. In this manner the compensating signal will cause a variation in horizontal beam positioning so as to maintain horizontal orientation between different sequential horizontal scan lines regardless of the average beam current intensity of each of the horizontal scan lines. Preferably, the compensation circuit comprises a parallel resistor and capacitor connected in series between an output terminal of the transformer and the power supply terminal of the video driver.
摘要翻译：公开了一种扫描CRT控制系统，其中使用水平同步脉冲来产生脉冲信号，该脉冲信号向接收相对低的DC电源输入信号的变压器电路提供输入。变压器电路产生连接到CRT屏幕的非常高的DC电压，同时还提供相对较低的电压电源信号，用于开发提供给控制用于CRT的光束激发的视频驱动器的电源信号。在变压器电路和视频驱动器的电源端子之间设置补偿电路，使得根据每个水平视频扫描线在变压器电路处提供补偿信号。补偿信号具有对应于水平扫描频率的频率和根据每个单独水平扫描线的平均电流负载而变化的幅度。以这种方式，补偿信号将导致水平光束定位的变化，以便在不同的顺序水平扫描线之间保持水平取向，而不管每个水平扫描线的平均束电流强度如何。优选地，补偿电路包括并联电阻器和电容器，其串联连接在变压器的输出端子和视频驱动器的电源端子之间。

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