Technique for trimming photoresistors and trimmed photoresistors
    1.
    发明授权
    Technique for trimming photoresistors and trimmed photoresistors 失效
    修整光敏电阻和微调光敏电阻的技术

    公开(公告)号:US5309132A

    公开(公告)日:1994-05-03

    申请号:US41551

    申请日:1993-04-02

    IPC分类号: H01L31/0216 H01L31/08

    CPC分类号: H01L31/0216 H01L31/08

    摘要: A technique for trimming photoresistors to change relatively high tolerance parts to relatively low tolerance parts by blocking out a portion of the photoactive area, and the so-trimmed photoresistors. The blocking out can be performed by placing ink over the photo-active area. This ink placement step can be easily added in the photoresistor assembly line after the initial calibration location.

    摘要翻译: 一种用于修整光敏电阻器以通过阻挡一部分光活性区域而将相对较高公差部分改变为相对较低公差部分的技术,以及如此修整的光敏电阻器。 可以通过将墨水放置在光活性区域上来进行遮挡。 在初始校准位置之后,该墨水放置步骤可以容易地添加到光电晶体组装线中。

    Tapped inductor slave regulating circuit
    2.
    发明授权
    Tapped inductor slave regulating circuit 失效
    分接电感从调节电路

    公开(公告)号:US5336985A

    公开(公告)日:1994-08-09

    申请号:US973267

    申请日:1992-11-09

    IPC分类号: G05F1/56

    CPC分类号: G05F1/56 Y10T307/43

    摘要: A tapped inductor slave regulating circuit provides a second slave output voltage derived from a tapped connection to the filter storage inductor of a first output voltage of a switching power supply converter. In the converter, an unregulated voltage is provided through a switching circuit to a storage inductor to develop a first output. The switching circuit is turned off and a synchronous rectifier is turned on to freewheel the current through the storage inductor and the load. The storage inductor is center-tapped and coupled to a switching circuit to provide a second slaved output. The location of the center tap is chosen to provide the proper voltage of the second output. In one embodiment, the switching circuit for the slaved output is turned on during the freewheel portion of each cycle to provide a proper voltage level for the second output. In another embodiment, a separate local feedback circuit is provided to further regulate the second output voltage level.

    摘要翻译: 抽头电感器从调节电路提供从与开关电源转换器的第一输出电压的滤波器存储电感器的抽头连接导出的第二从输出电压。 在转换器中,通过开关电路向存储电感器提供未调节的电压以产生第一输出。 开关电路被关闭,并且同步整流器导通以使通过存储电感器和负载的电流释放。 存储电感器被中心抽头并耦合到开关电路以提供第二从属输出。 选择中心抽头的位置以提供第二输出的适当电压。 在一个实施例中,用于从动输出的开关电路在每个周期的续流部分期间导通,以为第二输出提供适当的电压电平。 在另一个实施例中,提供了单独的局部反馈电路以进一步调节第二输出电压电平。

    Circuit for controlling bias voltage used to regulate contrast in a
display panel
    3.
    发明授权
    Circuit for controlling bias voltage used to regulate contrast in a display panel 失效
    用于控制用于调节显示面板对比度的偏置电压的电路

    公开(公告)号:US5534889A

    公开(公告)日:1996-07-09

    申请号:US119422

    申请日:1993-09-10

    IPC分类号: G09G3/36 G09G5/00

    CPC分类号: G09G3/36

    摘要: A liquid crystal display (LCD) panel which has its contrast controlled through the use of a pulse width modulation (PWM) circuit contained in the video controller and a contrast control circuit. In response to a particular video refresh mode, the PWM circuit modulates the pulse width of a signal that is an input to the contrast control circuit. The pulse width is changed by the use of a base contrast register and two offset registers. Depending on the video mode, the base register is used alone or is combined with one of the offset registers to provide a signal to indicate the duty cycle of the signal. The pulse width modulated signal is converted to a DC bias contrast voltage which is provided to the LCD panel.

    摘要翻译: 通过使用包含在视频控制器中的脉冲宽度调制(PWM)电路和对比度控制电路来控制其对比度的液晶显示器(LCD)面板。 响应于特定的视频刷新模式,PWM电路调制作为对比度控制电路的输入的信号的脉冲宽度。 通过使用基本对比度寄存器和两个偏移寄存器来改变脉冲宽度。 根据视频模式,基本寄存器单独使用或与其中一个偏移寄存器组合,以提供信号以指示信号的占空比。 脉冲宽度调制信号被转换为提供给LCD面板的DC偏压对比度电压。