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    • 21. 发明授权
    • Intensity control for light-emitting diode display
    • 用于发光二极管显示器的强度控制
    • US3787752A
    • 1974-01-22
    • US3787752D
    • 1972-07-28
    • US NAVY
    • DELAY D
    • G01R13/40G04G9/00H03K19/14
    • G01R13/405G04G9/0088
    • A plurality of light-emitting diode elements which are unmatched in light output at the lower portions of their forward current ranges and which form an integrated illuminated visual display are activated by a power supply arrangement which applies to each diode element a series of independent power pulses of sufficient power to activate each diode element to saturation and into light-emitting condition in a frequency range which appears to the human eye to be steady illumination, the power supply arrangement being provided with a control feature for selectively varying the duration of the power pulses in order to vary the apparent intensity of the illuminated display, and also provided with current limiting means to limit the current passed by each diode element, during each power pulse and its activation thereby, to a given upper range of forward current in which the light-emitting diode element light outputs are substantially matched and in which optimum light emission efficiency is achieved.
    • 多个发光二极管元件在其正向电流范围的下部输出的光不匹配,并形成集成的照明可视显示器,由一个电源装置激活,该电源装置将一系列独立的功率脉冲 具有足够的功率以将每个二极管元件激活到在人眼看起来稳定照明的频率范围内的饱和和发光状态,电源装置被提供有用于选择性地改变功率脉冲的持续时间的控制特征 为了改变照明显示器的表观强度,并且还设有电流限制装置,以限制每个二极管元件在每个功率脉冲及其激活期间通过的电流到给定的上升范围的正向电流,其中光 发光二极管元件光输出基本匹配,其中最佳发光效率为 实现了