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    • 6. 发明授权
    • Pulse width modulation with effective high duty resolution
    • 具有高占空比分辨率的脉宽调制
    • US09490792B2
    • 2016-11-08
    • US12703239
    • 2010-02-10
    • Bin Zhao
    • Bin Zhao
    • H03K7/08H04N9/31H05B33/08H02M1/084
    • H03K7/08H02M1/084H04N9/3123H05B33/0818H05B33/0845Y02B20/346
    • A pulse width modulation (PWM) signal generator generates a PWM signal having a specified effective PWM duty resolution for a corresponding cycle window. The PWM signal generator receives an N-bit value representing a duty to be implemented and sets values X and Y to the M least significant bits and the N-M most significant bits, respectively, of the N-bit value. The value M can be determined based on the value N and a maximum implementable frequency of a clock signal used to time the generation of each PWM cycle. The PWM signal generator generates a cycle window of 2M PWM cycles, each PWM cycle of the cycle window having a duty of either Y or Y+1. The number of PWM cycles in the cycle window having the duty Y+1 is based on the value X and the PWM cycles having a particular duty are contiguous within the cycle window.
    • 脉冲宽度调制(PWM)信号发生器产生对于相应的周期窗口具有指定的有效PWM占空比分辨率的PWM信号。 PWM信号发生器接收表示要实现的占空比的N位值,并将值X和Y分别设置为N位值的M个最低有效位和N-M个最高有效位。 可以基于用于时间产生每个PWM周期的时钟信号的值N和最大可实施频率来确定值M. PWM信号发生器产生2M个PWM周期的周期窗口,周期窗口的每个PWM周期具有Y或Y + 1的占空比。 具有占空比Y + 1的周期窗口中的PWM周期的数量基于值X,并且具有特定占空比的PWM周期在周期窗口内是连续的。
    • 10. 发明授权
    • LED driver with frame-based dynamic power management
    • LED驱动器采用基于帧的动态电源管理
    • US08279144B2
    • 2012-10-02
    • US12183492
    • 2008-07-31
    • Bin ZhaoJack W. CornishBrian B. HorngAndrew M KameyaJan KrellnerKenneth C. KwokVictor K. LeeWeizhuang W. Xin
    • Bin ZhaoJack W. CornishBrian B. HorngAndrew M KameyaJan KrellnerKenneth C. KwokVictor K. LeeWeizhuang W. Xin
    • G09G3/32
    • H05B33/0815H05B33/0827H05B33/086
    • Disclosed are example techniques for frame-based power management in a light emitting diode (LED) system having a plurality of LED strings. A voltage source provides an output voltage to drive the LED strings. An LED driver generates a frame timing reference representative of the frame rate or display timing of a series of image frames to be displayed via the LED system. An update reference is generated from the frame timing reference. The LED driver monitors one or more operating parameters of the LED system. In response to update triggers marked by the update reference, the LED driver adjusts the output voltage of the voltage source based on the status of each of the one or more monitored operating parameters (either from the previous update period or determined in response to the update trigger), thereby synchronizing the updating of the output voltage to the frame rate (or a virtual approximation of the frame rate) of the video being displayed.
    • 公开了具有多个LED串的发光二极管(LED)系统中用于基于帧的电源管理的示例技术。 电压源提供输出电压来驱动LED串。 LED驱动器生成表示要通过LED系统显示的一系列图像帧的帧速率或显示定时的帧定时参考。 从帧定时参考生成更新参考。 LED驱动器监视LED系统的一个或多个操作参数。 响应于由更新参考标记的更新触发器,LED驱动器基于一个或多个监视的操作参数中的每一个的状态来调节电压源的输出电压(从先前的更新周期或响应于更新确定) 触发),从而将输出电压的更新同步于正在显示的视频的帧速率(或帧速率的虚拟近似)。