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公开(公告)号：US4701788A
公开(公告)日：1987-10-20
申请号：US823677
申请日：1986-01-29
摘要： A color video projector of the type employing red, green and blue cathode ray tubes, dichroic mirrors and a final single lens through which the red, green and blue light from the CRTs is projected on a screen exhibits non-uniform color temperature across the width of the screen. Compensating waveforms for the red, green and blue video signals are generated and multiplied with the respective red, green and blue contrast signals, the products then being multiplied with the red, green and blue video signals respectively and applied to the cathodes (or grids) of the red, green and blue CRTs respectively to provide a more uniform color temperature across the width of the screen.
摘要翻译： 使用红色，绿色和蓝色阴极射线管，二向色镜和最终单透镜的彩色视频投影仪，来自CRT的红色，绿色和蓝色光通过该透镜投射在屏幕上，在整个宽度上表现出不均匀的色温 的屏幕。 产生红色，绿色和蓝色视频信号的补偿波形并与相应的红色，绿色和蓝色对比度信号相乘，产物分别与红色，绿色和蓝色视频信号相乘并施加到阴极（或网格） 的红色，绿色和蓝色CRT，以在屏幕的宽度上提供更均匀的色温。
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公开(公告)号：US4510432A
公开(公告)日：1985-04-09
申请号：US464490
申请日：1983-02-07
CPC分类号： G09G1/08
摘要： A vector generator includes a linear charge pump in the form of a DAC with a constant but variable current output that can charge a capacitor connected between the output and one of the input terminals of an operational amplifier. A second constant current generator having an output current one-half that of the maximum output current of the DAC and of opposite polarity also is provided for charging the capacitor, the constant current generators being so connected to the capacitor that it can be charged either positively or negatively. A switching network controls whether the capacitor is charging or not depending on the state of the switching network. A second DAC with a constant but variable output voltage is provided and produces an output indicative of the coordinate of the vector to be drawn. The voltage on the capacitor is compared to the output voltage of the second DAC, and, when they are equal, a control signal is produced that changes the state of the switch to terminate charging of the capacitor.
摘要翻译： 矢量发生器包括具有恒定但可变电流输出的DAC形式的线性电荷泵，其可对连接在运算放大器的输出端和输入端之间的电容器进行充电。 提供具有DAC的最大输出电流的两倍的输出电流并且具有相反极性的第二恒定电流发生器用于对电容器充电，恒定电流发生器被连接到电容器，使其可以正向地被充电 或负面。 交换网络根据交换网络的状态来控制电容器是否正在充电。 提供具有恒定但可变输出电压的第二DAC，并产生指示要绘制的矢量的坐标的输出。 将电容器上的电压与第二DAC的输出电压进行比较，当它们相等时，产生改变开关状态以终止电容器充电的控制信号。
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