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    • 33. 发明申请
    • Liquid-crystal light-amount adjusting device, method of driving liquid-crystal light-amount adjusting device, and camera including the liquid-crystal light-amount adjusting device
    • 液晶光量调节装置,液晶光量调节装置的驱动方法和包括液晶光量调节装置的照相机
    • US20080074532A1
    • 2008-03-27
    • US11973194
    • 2007-10-05
    • Toshifumi Takaoka
    • Toshifumi Takaoka
    • H04N5/335G09G5/00
    • H04N5/238G02F1/13306G02F2203/60H04N5/2254
    • A liquid-crystal light-amount adjusting device in which the effective power of driving pulses for acceleration is optimized to improve response characteristics of optical transmittance, a method of driving the apparatus, and a camera including the apparatus. The liquid-crystal light-amount adjusting device according to the present invention includes a driving-pulse generating circuit (16) for generating driving pulses having pulsed voltages, a liquid-crystal light-amount adjusting unit (12) for changing the optical transmittance of a liquid crystal according to pulse shapes of the driving pulses, and a microcomputer (19) for controlling frequencies and duty ratios of the driving pulses. The microcomputer (19) exercises control so that the driving-pulse generating circuit (16) generates driving pulses including driving pulses for acceleration, having a pulse shape with a first frequency and a first duty ratio, and driving pulses for dimming, having a pulse shape with a second frequency that is different from the first frequency and a second duty ratio that is different from the first duty ratio.
    • 一种液晶光量调节装置,其中优化用于加速的驱动脉冲的有效功率以改善光透射率的响应特性,驱动装置的方法以及包括该装置的照相机。 根据本发明的液晶光量调节装置包括用于产生具有脉冲电压的驱动脉冲的驱动脉冲发生电路(16),用于改变具有脉冲电压的驱动脉冲发生电路的液晶光量调节单元(12) 根据驱动脉冲的脉冲形状的液晶,以及用于控制驱动脉冲的频率和占空比的微计算机(19)。 微型计算机(19)进行控制,使得驱动脉冲发生电路(16)产生包括具有第一频率和第一占空比的脉冲形状的用于加速的驱动脉冲的驱动脉冲和具有脉冲的驱动脉冲 形状具有不同于第一频率的第二频率和与第一占空比不同的第二占空比。
    • 34. 发明授权
    • Electric dimming device and its driving method
    • 电动调光装置及其驱动方法
    • US07230598B2
    • 2007-06-12
    • US10311656
    • 2002-04-19
    • Masaru KawabataToru UdakaToshiharu YanagidaToshifumi TakaokaKazuhiro Tanaka
    • Masaru KawabataToru UdakaToshiharu YanagidaToshifumi TakaokaKazuhiro Tanaka
    • G09G3/36
    • H04N5/238G02F1/13306G02F1/133528G02F1/13725
    • An electrical dimmer device and its driving method applicable to, for example, an image pickup unit and a display unit operate so that when a control signal for stop adjustment is changed from its current value of stop adjustment to a larger value, which occurs when the light transmissivity of a positive type liquid crystal is raised, or when the light transmissivity of a negative type liquid crystal is lowered, the control signal is temporarily varied to an intermediate value that is larger than the larger value. The energy of the varied larger value and a time during which that varied value is applied are determined in accordance with predetermined values. By doing so, it is possible to make a response speed when changing the light transmissivity extremely faster and thus attain a response time, of for example, one field period of time or less required for a stop mechanism of a video camera.
    • 适用于例如图像拾取单元和显示单元的电气调光装置及其驱动方法进行操作,使得当用于停止调整的控制信号从其当前的停止调整值改变为更大的值时 正型液晶的透光率提高,或者当负型液晶的透光率降低时,控制信号暂时变化为大于较大值的中间值。 根据预定值确定变化的较大值的能量和施加该变化值的时间。 通过这样做,可以更快地改变光透射率时作出响应速度,从而获得例如对于摄像机的停止机构所要求的一个场周期或更短的响应时间。