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    • 5. 发明授权
    • BLACK LEVEL DETECTING CIRCUIT OF VIDEO SIGNAL
    • 电路用于检测的视频信号的黑电平Level
    • EP0914747B1
    • 2005-02-02
    • EP98905723.7
    • 1998-03-02
    • MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
    • TAKESHIMA, MasahiroKAGEYAMA, Atsuhisa
    • H04N17/00
    • H04N5/20H04N5/16
    • A black level detecting circuit compares an input video signal with a current minimum value of input video signals, then detects a difference between the input signal and the current minimum value when the input value is smaller than the current minimum value, and then outputs the detected difference only during a detecting period of the black level, then corrects the minimum value by using this output for renewing the current minimum value, and finally outputs this renewed minimum value as a new minimum value of the input video signal. The black level detecting circuit also latches the minimum value during the vertical blanking pulse and initializes the minimum value during a vertical blanking period so as to detect a black level of the input signal. As such, the black level detecting circuit measures the black level only during a video period, thereby reducing detection errors due to noises, and also an automatic initialization of the minimum value during a blanking period can contribute to a more stable detection of the black level. The black level detected can be used effectively as a control signal over picture quality for each field or each frame.
    • 8. 发明公开
    • A device for compensating for DC errors in a high definition television receiver
    • 在高分辨率电视接收机补偿直流误差的装置。
    • EP0677951A3
    • 1996-12-04
    • EP95300553.5
    • 1995-01-30
    • LG ELECTRONICS INC.
    • Kim, Dae Jin, Keon Young Villa 918-202,
    • H04N5/16H04N5/44
    • H04N5/4401H03D3/008H04N5/16
    • A device for compensating for direct current (DC) errors in a television receiver. The device includes a non-interference detecting circuit for detecting a DC value representing a channel signal in response to a control signal indicating whether an interference or non-interference condition exists, an interference detecting circuit for detecting a DC value representing the channel signal in response to a synchronization signal, a circuit for selecting a detected DC value either from the non-interference circuit or the interference detecting circuit based on whether the control signal indicates the interference or non-interference condition, and a circuit for providing a DC compensation value based on a selected DC value from the selecting circuit.
    • 一种用于补偿在电视接收机中的直流(DC)的错误的设备。 该装置包括一个非干扰检测电路,用于检测表示响应于控制信号的信道信号的直流值指示是否干扰或无干扰条件存在,其中干扰检测电路,用于检测表示在响应所述信道信号的DC值 到同步信号,用于从所述非干扰电路或基于是否所述控制信号指示所述干扰或无干扰状况的干扰检测电路,以及用于提供DC补偿值的电路选择一个检测到的DC值要么一个电路基于 从DC选择电路所选择的值。
    • 10. 发明公开
    • A signal amplifier circuit and an image display device adopting the signal amplifier circuit
    • Signalverstärkerschaltungund Bildanzeigevorrichtung die einenSignalverstärkerschaltungverwendet。
    • EP0657863A2
    • 1995-06-14
    • EP94302380.4
    • 1994-04-05
    • SHARP KABUSHIKI KAISHA
    • Kubota, YasushiKatoh, Ken-ichiYoneda, Hiroshi
    • G09G3/36
    • G09G3/2011G09G3/3688G09G2310/027G09G2310/0291G11C19/00H03F1/303H03G1/00H04N5/148H04N5/16H04N5/68H04N5/70
    • A signal amplifier circuit is provided with a buffer amplifier (1) and an adjusting circuit (2) for detecting a difference in voltage between a reference voltage (V o ) and an output voltage (V o + ΔV) of the buffer amplifier when the reference voltage (V o ) is inputted to the buffer amplifier (1) as an offset voltage, and for inputting a voltage obtained by subtracting the offset voltage (ΔV) from the voltage of an input signal so as to cancel out the offset voltage. An image display device of the present invention includes the above signal amplifier circuit. According to the above arrangement, the offset voltage (ΔV) can be cancelled out. Therefore, the signal amplifier circuit having a desirable buffer characteristic that a voltage having the same level as the voltage of the input signal can be outputted even if the offset voltage is generated in the buffer amplifier. By adopting the above signal amplifier circuit, an image display device which permits a high quality image display can be achieved.
    • 信号放大器电路设置有缓冲放大器(1)和调整电路(2),用于检测当基准电压(Vo)与缓冲放大器的输出电压(Vo + DELTA V)之间的电压差时, 电压(Vo)作为偏移电压被输入到缓冲放大器(1),并且用于输入通过从输入信号的电压中减去偏移电压(DELTA V)而获得的电压,以抵消偏移电压。 本发明的图像显示装置包括上述信号放大电路。 根据上述结构,可以消除偏移电压(DELTA V)。 因此,即使在缓冲放大器中产生偏移电压,信号放大器电路也可以输出具有与输入信号的电压相同电平的电压的期望的缓冲特性。 通过采用上述信号放大器电路,可以实现允许高质量图像显示的图像显示装置。