公开(公告)号：US07825610B2

公开(公告)日：2010-11-02

申请号：US12056237

申请日：2008-03-26

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  H05B33/0815 ,  Y02B20/347

摘要： Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive the LED strings. An LED driver monitors the tail voltages of the active LED strings to identify the minimum, or lowest, tail voltage and adjusts the output voltage of the voltage source based on the lowest tail voltage. The LED driver can adjust the output voltage so as to maintain the lowest tail voltage at or near a predetermined threshold voltage so as to ensure that the output voltage is sufficient to properly drive each active LED string with a regulated current in view of pulse width modulation (PWM) performance requirements without excessive power consumption.

摘要翻译： 公开了具有多个LED串的发光二极管（LED）系统中的电源管理。 电压源提供输出电压来驱动LED串。 LED驱动器监视有源LED串的尾部电压，以识别最小或最低的尾部电压，并根据最低的尾部电压调节电压源的输出电压。 LED驱动器可以调节输出电压，以将最低的尾部电压保持在预定阈值电压处或接近预定阈值电压，以便确保输出电压足以根据脉宽调制来适当地驱动具有调节电流的每个有源LED串 （PWM）性能要求，而无需过多的功耗。

公开(公告)号：US20100194308A1

公开(公告)日：2010-08-05

申请号：US12363607

申请日：2009-01-30

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  Y02B20/347

摘要： A voltage source provides an output voltage to drive a plurality of light emitting diode (LED) strings. A LED driver adjusts the level of the output voltage so as to maintain the lowest tail voltage of the LED strings at or near a predetermined threshold voltage so as provide sufficient headroom voltages for current regulators for the LED strings. The LED driver operates in an operational mode and a calibration mode, which can be implemented in parallel with, or part of, the operational mode. During the calibration mode, the LED driver determines, for each LED string, a code value representative of the level of the output voltage necessary to maintain the tail voltage of the corresponding LED string at or near the predetermined threshold voltage. In the operational mode, the code values from the calibration mode are used to control the voltage source to provide an appropriate level for the output voltage.

摘要翻译： 电压源提供输出电压以驱动多个发光二极管（LED）串。 LED驱动器调节输出电压的电平，以便将LED串的最低尾电压保持在预定阈值电压处或接近预定阈值电压，以便为LED串的电流调节器提供足够的净空电压。 LED驱动器在操作模式和校准模式下操作，其可以与操作模式并行或部分实现。 在校准模式期间，LED驱动器针对每个LED串确定代表将相应LED串的尾部电压保持在或接近预定阈值电压所需的输出电压电平的代码值。 在操作模式下，来自校准模式的代码值用于控制电压源以为输出电压提供适当的电平。

公开(公告)号：US08049439B2

公开(公告)日：2011-11-01

申请号：US12363607

申请日：2009-01-30

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  Y02B20/347

摘要： A voltage source provides an output voltage to drive a plurality of light emitting diode (LED) strings. A LED driver adjusts the level of the output voltage so as to maintain the lowest tail voltage of the LED strings at or near a predetermined threshold voltage so as provide sufficient headroom voltages for current regulators for the LED strings. The LED driver operates in an operational mode and a calibration mode, which can be implemented in parallel with, or part of, the operational mode. During the calibration mode, the LED driver determines, for each LED string, a code value representative of the level of the output voltage necessary to maintain the tail voltage of the corresponding LED string at or near the predetermined threshold voltage. In the operational mode, the code values from the calibration mode are used to control the voltage source to provide an appropriate level for the output voltage.

摘要翻译： 电压源提供输出电压以驱动多个发光二极管（LED）串。 LED驱动器调节输出电压的电平，以便将LED串的最低尾电压保持在预定阈值电压处或接近预定阈值电压，以便为LED串的电流调节器提供足够的净空电压。 LED驱动器在操作模式和校准模式下操作，其可以与操作模式并行或部分实现。 在校准模式期间，LED驱动器针对每个LED串确定代表将相应LED串的尾部电压维持在或接近预定阈值电压所需的输出电压电平的代码值。 在操作模式下，来自校准模式的代码值用于控制电压源以为输出电压提供适当的电平。

公开(公告)号：US08035315B2

公开(公告)日：2011-10-11

申请号：US12340985

申请日：2008-12-22

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

IPC分类号： H05B37/02 ,  G09G5/00

CPC分类号： H05B33/0818 ,  H05B33/0827 ,  H05B33/0851

摘要： Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.

摘要翻译： 公开了具有多个LED串的发光二极管（LED）系统中的电源管理。 电压源提供输出电压以驱动多个LED串。 LED驱动器实现反馈机制来监测有源LED串的尾部电压以识别最小尾电压，并且基于最低的尾部电压来调节电压源的输出电压。 LED驱动器的回路校准模块基于用于产生特定输出电压的数字代码值与基于由特定输出电压产生的最小尾部电压产生的另一数字代码值之间的关系来校准LED驱动器的反馈机制 。

公开(公告)号：US20100156315A1

公开(公告)日：2010-06-24

申请号：US12340985

申请日：2008-12-22

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

IPC分类号： H05B41/36

CPC分类号： H05B33/0818 ,  H05B33/0827 ,  H05B33/0851

摘要： Power management in a light emitting diode (LED) system having a plurality of LED strings is disclosed. A voltage source provides an output voltage to drive a plurality of LED strings. An LED driver implements a feedback mechanism to monitor the tail voltages of the active LED strings to identify the minimum tail voltage and adjust the output voltage of the voltage source based on the lowest tail voltage. A loop calibration module of the LED driver calibrates the feedback mechanism of the LED driver based on a relationship between a digital code value used to generate a particular output voltage and another digital code value generated based on the minimum tail voltage resulting from the particular output voltage.

摘要翻译： 公开了具有多个LED串的发光二极管（LED）系统中的电源管理。 电压源提供输出电压以驱动多个LED串。 LED驱动器实现反馈机制来监测有源LED串的尾部电压以识别最小尾电压，并且基于最低的尾部电压来调节电压源的输出电压。 LED驱动器的回路校准模块基于用于产生特定输出电压的数字代码值与基于由特定输出电压产生的最小尾部电压产生的另一数字代码值之间的关系来校准LED驱动器的反馈机制 。

公开(公告)号：US20100026203A1

公开(公告)日：2010-02-04

申请号：US12183492

申请日：2008-07-31

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

IPC分类号： H05B33/00

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  H05B33/086

摘要： 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.

摘要翻译： 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）。

公开(公告)号：US08279144B2

公开(公告)日：2012-10-02

申请号：US12183492

申请日：2008-07-31

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M Kameya ,  Jan Krellner ,  Kenneth C. Kwok ,  Victor K. Lee ,  Weizhuang W. Xin

IPC分类号： G09G3/32

CPC分类号： H05B33/0815 ,  H05B33/0827 ,  H05B33/086

摘要： 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.

摘要翻译： 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）。

公开(公告)号：US08115414B2

公开(公告)日：2012-02-14

申请号：US12363179

申请日：2009-01-30

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Victor K. Lee ,  Andrew M. Kameya

IPC分类号： H05B37/02

CPC分类号： H05B33/0815 ,  H05B33/0827

摘要： Techniques for dynamic headroom control in a light emitting diode (LED) system are disclosed. An output voltage is provided to drive a plurality of LED strings. A feedback controller monitors the tail voltages of the LED strings to identify the minimum tail voltage and adjusts the output voltage based on the lowest tail voltage. The LED strings grouped into subsets and the feedback controller is segmented such that, for a certain duration, a minimum tail voltage is determined for each subset. The minimum tail voltages of the subsets are used to determine the overall minimum tail voltage of the plurality of LED strings for the certain duration so as to control the output voltage in the following duration. The segments of the feedback controller can be implemented in separate integrated circuit (IC) packages, thereby facilitating adaptation to different numbers of LED strings by integrating the corresponding number of IC packages.

摘要翻译： 公开了一种用于发光二极管（LED）系统中的动态裕量控制技术。 提供输出电压以驱动多个LED串。 反馈控制器监视LED串的尾部电压，以识别最小尾电压，并根据最低的尾部电压调节输出电压。 将LED串分组成子集，并且反馈控制器被分段，使得在一定持续时间内，为每个子集确定最小尾电压。 子集的最小尾电压用于在特定持续时间内确定多个LED串的总体最小尾电压，以便在随后的持续时间内控制输出电压。 反馈控制器的段可以在单独的集成电路（IC）封装中实现，从而通过集成相应数量的IC封装来促进适应不同数量的LED串。

公开(公告)号：US20090273288A1

公开(公告)日：2009-11-05

申请号：US12504335

申请日：2009-07-16

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  G09G3/342 ,  G09G2320/064 ,  H05B33/0815 ,  H05B33/0818

摘要： A light emitting diode (LED) system implements a LED driver to drive a set of one or more LED strings. The LED driver includes a voltage source to provide an adjustable output voltage to a head end of each LED string of the set for a first duration and a second duration following the first duration. The LED driver further includes a feedback controller to control the voltage source to adjust the output voltage for the second duration based on a digital code value generated from a minimum tail voltage of one or more tail voltages of the set at a sample point of the first duration. The LED driver further includes a power controller to temporarily enable one or more components of the feedback controller for a sample period of the first duration, the sample period comprising the sample point.

摘要翻译： 发光二极管（LED）系统实现LED驱动器以驱动一组或多个LED串。 LED驱动器包括电压源，以在第一持续时间和第一持续时间之后的第一持续时间和第二持续时间内向组的每个LED串的头端提供可调节的输出电压。 所述LED驱动器还包括反馈控制器，用于控制所述电压源，以基于在所述第一持续时间内的所述第一持续时间的采样点从所述组的一个或多个尾部电压的最小尾部电压产生的数字代码值来调整所述输出电压 持续时间 LED驱动器还包括功率控制器，用于临时使得反馈控制器的一个或多个部件在第一持续时间的采样周期内，该采样周期包括采样点。

公开(公告)号：US08106604B2

公开(公告)日：2012-01-31

申请号：US12504335

申请日：2009-07-16

申请人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

发明人： Bin Zhao ,  Jack W. Cornish ,  Brian B. Horng ,  Andrew M. Kameya ,  Kenneth C. Kwok ,  Victor K. Lee

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  G09G3/342 ,  G09G2320/064 ,  H05B33/0815 ,  H05B33/0818

摘要： A light emitting diode (LED) system implements a LED driver to drive a set of one or more LED strings. The LED driver includes a voltage source to provide an adjustable output voltage to a head end of each LED string of the set for a first duration and a second duration following the first duration. The LED driver further includes a feedback controller to control the voltage source to adjust the output voltage for the second duration based on a digital code value generated from a minimum tail voltage of one or more tail voltages of the set at a sample point of the first duration. The LED driver further includes a power controller to temporarily enable one or more components of the feedback controller for a sample period of the first duration, the sample period comprising the sample point.

摘要翻译： 发光二极管（LED）系统实现LED驱动器以驱动一组或多个LED串。 LED驱动器包括电压源，以在第一持续时间和第一持续时间之后的第一持续时间和第二持续时间内向组的每个LED串的头端提供可调节的输出电压。 所述LED驱动器还包括反馈控制器，用于控制所述电压源，以基于在所述第一持续时间内的所述第一持续时间的采样点从所述组的一个或多个尾部电压的最小尾部电压产生的数字代码值来调整所述输出电压 持续时间 LED驱动器还包括功率控制器，用于临时使得反馈控制器的一个或多个部件在第一持续时间的采样周期内，该采样周期包括采样点。