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    • 7. 发明公开
    • Digital convergence correcting apparatus
    • Digitale Vorrichtung zur Korrektur der Konvergenz。
    • EP0326152A2
    • 1989-08-02
    • EP89101429.2
    • 1989-01-27
    • HITACHI, LTD.Hitachi Video & Information System, Inc.
    • Shiomi, MakotoOhsawa, MichitakaSakamoto, ToshiyukiMatsumi, KuninoriOzeki, KosukeYuki, IkuoSato, Kenji
    • H04N9/28
    • H04N9/28
    • A convergence correcting apparatus is used in a projection television receiver including a CRT (1010) having an aspherical fluorescent screen (P₁) and a projection lens apparatus which is attached to the display screen of the CRT and has aspherical plastic lenses (101, 103, 104). In the digital convergence correcting apparatus, a digital memory (8) stores digital correction data corresponding to correction values of convergence adjustment points (201) indicative of a plurality of points on the display screens divided in the horizontal and vertical directions. A multi­plexer (15) reads out predetermined digital correction data from the digital memory (8) and time sharingly multiplexes. At least one digital/analog converter (19) receives the time sharingly multiplexed data from the multiplexer (15) and generates an analog signal. Sample and hold circuits (26, 26′) extract a predetermined correction signal from the analog output of the digital/analog converter (19) and sample and hold them. The convergence correcting apparatus is driven in accordance with the respective correction signals held by the sample and hold circuits (26, 26′).
    • 会聚校正装置用于包括具有非球面荧光屏(P1)的CRT(1010)和安装在CRT的显示屏上的投影透镜装置的投影电视接收机,并具有非球面塑料透镜(101,103, 104)。 在数字会聚校正装置中,数字存储器(8)存储对应于在水平和垂直方向划分的显示屏上指示多个点的会聚调整点(201)的校正值的数字校正数据。 多路复用器(15)从数字存储器(8)中读出预定的数字校正数据并进行时分复用。 至少一个数字/模拟转换器(19)从多路复用器(15)接收时间共享多路复用的数据并产生模拟信号。 采样和保持电路(26,26分钟)从数字/模拟转换器(19)的模拟输出提取预定的校正信号并进行采样并保持它们。 会聚校正装置根据由采样和保持电路(26,26分钟)保持的各个校正信号来驱动。