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1. 发明授权

US5059872A Digital convergence correction device 失效
标题翻译：数字会聚校正装置
公开(公告)号：US5059872A
公开(公告)日：1991-10-22
申请号：US670177
申请日：1991-03-15
申请人： Kuninori Matsumi , Tadahiro Kawagishi , Masahiro Kame , Makoto Shiomi , Kousuke Ozeki , Michitaka Ohsawa
发明人： Kuninori Matsumi , Tadahiro Kawagishi , Masahiro Kame , Makoto Shiomi , Kousuke Ozeki , Michitaka Ohsawa
IPC分类号： H04N9/28
CPC分类号： H04N9/28
摘要： The digital convergence correction device is used for a projection-type television receiver having a Braun tube with an aspherical surface fluorescent screen and a projection lens system with an aspherical surface plastic lens attached to the display screen of th Braun tube. In the digital convergence correction device, a digital memory stores digital correction data corresponding to correction values at the convergence adjustment points on the display screen that is divided in the horizontal and vertical directions. A multiplexer reads the digital correction data out of the digital memory, and implements the time division multiplexing for the data. A D/A converter receives the multiplexed data from the multiplexer, and converts it into an analog signal. The device is provided with sample-holding circuits for making coincident timing for the outputs of the time division multiplexing process, so that no phase shift arises at the time division process and multi-channel time division process is made possible. Among numbers of time divisions, an optimal one can be chosen to meet the system requirement. Consequently, the number of D/A converters is reduced thereby to down-cost the digital convergence correction device. The convergence correction device operates in accordance with the correction signals held in the respective sample-holding circuits.
摘要翻译：数字会聚校正装置用于具有带有非球面荧光屏的布朗管和投影透镜系统的投影型电视接收机，该系统具有安装在布劳恩管显示屏上的非球面塑料透镜。在数字会聚校正装置中，数字存储器将对应于在水平和垂直方向上划分的显示屏上的会聚调整点处的校正值对应的数字校正数据。多路复用器从数字存储器读出数字校正数据，并对数据进行时分复用。 D / A转换器从多路复用器接收多路复用数据，并将其转换为模拟信号。该装置具有用于对时分复用处理的输出进行重合定时的采样保持电路，使得在时分处理和多通道时分处理都不会产生相移。在时间分割的数量中，可以选择最佳的一个来满足系统要求。因此，D / A转换器的数量减少，从而降低数字会聚校正装置的成本。会聚校正装置根据保持在各个采样保持电路中的校正信号进行工作。

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