公开(公告)号：US20090224736A1

公开(公告)日：2009-09-10

申请号：US12045588

申请日：2008-03-10

申请人： Hendrik Santo ,  Dilip S. ,  Kien Vi ,  Ranajit Ghoman ,  Matthew D. Schindler

发明人： Hendrik Santo ,  Dilip S. ,  Kien Vi ,  Ranajit Ghoman ,  Matthew D. Schindler

IPC分类号： G05F1/10

CPC分类号： G05F1/561

摘要： The present invention relates to circuits and methods for limiting the operating area of a transistor in a constant current source. The circuits and methods use a detector and a driver to limit the operating area of a transistor. The detector and driver have parameters selected so that, when the voltage at the drain of the transistor satisfies a reference condition, the driver causes drain current of the transistor to decrease. The reference condition is determined relative to the maximum safe drain-to-source voltage at the design drain current of the constant current source.

摘要翻译： 本发明涉及用于限制恒流源中的晶体管的工作面积的电路和方法。 电路和方法使用检测器和驱动器来限制晶体管的工作面积。 检测器和驱动器具有选择的参数，使得当晶体管的漏极处的电压满足参考条件时，驱动器使晶体管的漏极电流减小。 参考条件是相对于恒流源设计漏极电流的最大安全漏极 - 源极电压来确定的。

公开(公告)号：US20080290803A1

公开(公告)日：2008-11-27

申请号：US11805522

申请日：2007-05-22

申请人： Hendrik Santo ,  Gurjit Thandi ,  Dilip S. ,  Kien Vi

发明人： Hendrik Santo ,  Gurjit Thandi ,  Dilip S. ,  Kien Vi

IPC分类号： H05B37/02

CPC分类号： H05B37/0218 ,  G09G3/3413 ,  G09G2320/0242 ,  G09G2320/0606 ,  G09G2320/0626 ,  G09G2360/144 ,  Y02B20/46

摘要： The techniques of the present invention relate to automatically controlling display intensity. The present invention includes a calibration step in which the display intensity settings are correlated to the ambient light intensity conditions. The present invention also includes an automatic adjustment step in which the ambient light intensity is measured and the display intensity is automatically adjusted according to a correlation defined in the calibration step.

摘要翻译： 本发明的技术涉及自动控制显示强度。 本发明包括其中显示强度设置与环境光强条件相关的校准步骤。 本发明还包括自动调整步骤，其中测量环境光强度，并且根据校准步骤中定义的相关度自动调节显示强度。

公开(公告)号：US20080290933A1

公开(公告)日：2008-11-27

申请号：US11805523

申请日：2007-05-22

申请人： Gurjit S. Thandi ,  Dilip S. ,  Hendrik Santo ,  Kien Vi

发明人： Gurjit S. Thandi ,  Dilip S. ,  Hendrik Santo ,  Kien Vi

IPC分类号： G05F3/02

CPC分类号： G05F3/205

摘要： The present invention uses two transistors instead of a sensing resistor to provide a constant current source for a load such as an array of light emitting diodes (“LEDs”). In the present invention, a bias current is applied to a branch of the circuit. The drain-to-source voltages of two transistors are matched. The voltage at the gate of both transistors is controlled based on the bias current and the drain-to-source current of the first of the two transistors. The second of the two transistors is sized such that source current of the second transistor is a multiple of the source current of the first transistor for a given gate voltage. By the techniques of this invention, the load current in a circuit is efficiently kept constant at a multiple of the input bias current.

摘要翻译： 本发明使用两个晶体管代替感测电阻器来为诸如发光二极管阵列（“LED”）的负载提供恒定电流源。 在本发明中，偏置电流被施加到电路的支路。 两个晶体管的漏极 - 源极电压匹配。 基于两个晶体管中的第一个的偏置电流和漏极 - 源极电流来控制两个晶体管的栅极处的电压。 两个晶体管中的第二个的尺寸使得第二晶体管的源电流对于给定的栅极电压是第一晶体管的源极电流的倍数。 通过本发明的技术，电路中的负载电流被有效地保持恒定在输入偏置电流的倍数。

公开(公告)号：US20100237786A1

公开(公告)日：2010-09-23

申请号：US12649057

申请日：2009-12-29

申请人： Hendrik Santo ,  Matthew D. Schindler ,  Dilip S. ,  Tushar Dhayagude

发明人： Hendrik Santo ,  Matthew D. Schindler ,  Dilip S. ,  Tushar Dhayagude

IPC分类号： H05B37/02

CPC分类号： H05B33/0851 ,  G09G3/342 ,  H05B33/0842

摘要： The present invention relates to circuits and methods for controlling one or more LED strings. The circuit comprises a programmable controller coupled to one or more detectors, wherein the one or more detectors are configured to detect one or more measurable parameters of one or more LEDs or LED drivers. The controller is configured to receive information from the one or more detectors related to the one or more measurable parameters and use that information to determine the desired drive voltage for the LED strings. The controller is associated with a power supply having power factor correction (PFC) capability. The controller provides the power supply with a control signal indicative of the desired drive voltage for one or more LED strings. The power supply also receives ac voltage and current waveforms as inputs and performs power factor correction and rectified waveforms related to the ac waveforms. The power supply generates the desired drive voltage based on the control signal.

摘要翻译： 本发明涉及用于控制一个或多个LED串的电路和方法。 电路包括耦合到一个或多个检测器的可编程控制器，其中所述一个或多个检测器被配置为检测一个或多个LED或LED驱动器的一个或多个可测量的参数。 控制器被配置为从与一个或多个可测量参数相关的一个或多个检测器接收信息，并使用该信息来确定LED串所需的驱动电压。 控制器与具有功率因数校正（PFC）能力的电源相关联。 控制器为电源提供指示一个或多个LED串的期望驱动电压的控制信号。 电源还接收交流电压和电流波形作为输入，并进行与交流波形相关的功率因数校正和整流波形。 电源根据控制信号产生所需的驱动电压。

公开(公告)号：US20110267375A1

公开(公告)日：2011-11-03

申请号：US12772067

申请日：2010-04-30

申请人： Zhiyu Yang ,  Kien Vi ,  Dilip S. ,  Tushar Dhayagude

发明人： Zhiyu Yang ,  Kien Vi ,  Dilip S. ,  Tushar Dhayagude

IPC分类号： G09G5/10 ,  H05B37/02

CPC分类号： G09G3/342 ,  G09G3/3406 ,  G09G2320/064 ,  H05B33/0818 ,  H05B33/0827 ,  H05B33/0851 ,  Y02B20/346

摘要： System(s) and method(s) are provided for power management in an electronic display via compensation of a power source of a light-emitting-diode (LED) backlighting system. A compensation feedback loop includes a load-aware controller that receives the load condition from a dimming controller and supplies a control signal to the power source. An efficiency regulator functionally connected the backlight circuitry closes the compensation feedback loop and provides an input signal to the load-aware controller. The dimming controller implements phase-shifted pulse-modulation dimming, which based on duty cycle can establish a dimming equilibrium with two load conditions. The load aware controller includes a set of compensation blocks arranged in parallel, with a single compensation block connected to the input signal and that provides the control signal. A selector component in the load aware controller determines a compensation block to be connected to the compensation feedback loop based on the received load condition.

摘要翻译： 通过补偿发光二极管（LED）背光系统的电源，为电子显示器中的电力管理提供系统和方法。 补偿反馈回路包括负载感知控制器，其从调光控制器接收负载状况，并向控制电源提供控制信号。 功能上连接到背光电路的效率调节器关闭补偿反馈回路并向负载感知控制器提供输入信号。 调光控制器实现相移脉冲调制调光，其基于占空比可以在两个负载条件下建立调光平衡。 负载感知控制器包括并联布置的一组补偿块，单个补偿块连接到输入信号并提供控制信号。 负载感知控制器中的选择器部件基于接收的负载条件确定要连接到补偿反馈回路的补偿块。

公开(公告)号：US20090184904A1

公开(公告)日：2009-07-23

申请号：US12018399

申请日：2008-01-23

申请人： Dilip S. ,  Hendrik Santo ,  Tushar Dhayagude ,  Klen Vi ,  Sean Chen

发明人： Dilip S. ,  Hendrik Santo ,  Tushar Dhayagude ,  Klen Vi ,  Sean Chen

IPC分类号： G09G3/32

CPC分类号： G09G3/3426 ,  G09G3/3413 ,  G09G2310/0237 ,  G09G2310/024 ,  G09G2320/0633 ,  G09G2320/0666 ,  G09G2360/144

摘要： The present invention discloses apparatus and techniques relating to the intelligent control of a display's backlight LED strings. The present invention provides for controlling the display intensity on a region-by-region basis and for adjusting the intensity multiple times within the duration of a frame. The present invention also provides backlight adjustment in a manner that emphasizes certain colors and deemphasizes certain colors. The present invention also provides for adjustment of the backlight based on the ambient temperature.

摘要翻译： 本发明公开了与显示器的背光LED串的智能控制相关的装置和技术。 本发明提供了在逐帧的基础上控制显示强度并且在帧的持续时间内多次调整强度。 本发明还以强调某些颜色并且强调某些颜色的方式提供背光调整。 本发明还提供了基于环境温度来调节背光。

公开(公告)号：US20110204810A1

公开(公告)日：2011-08-25

申请号：US12712930

申请日：2010-02-25

申请人： Zhiyu Yang ,  Dilip S. ,  Tushar Dhayagude

发明人： Zhiyu Yang ,  Dilip S. ,  Tushar Dhayagude

IPC分类号： H05B41/16 ,  H03K3/00

CPC分类号： H05B33/0809 ,  H03K3/012 ,  H03K7/08 ,  H05B33/0842

摘要： Systems, circuits and methods for phase-shifting pulse width modulated signal generation are disclosed. In some embodiments, a phase-shifting pulse width modulation circuit is configured to output pulses based on an input pulse width modulated signal. The pulses are staggered relative to one another, and can be received by a light-emitting diode driver for driving a light-emitting diode string at one or more time periods. The phase-shifting pulse width modulation circuit can include a counter-based programmable delay subcircuit consisting of two counter-based programmable delay blocks.

摘要翻译： 公开了用于相移脉宽调制信号产生的系统，电路和方法。 在一些实施例中，移相脉宽调制电路被配置为基于输入脉宽调制信号输出脉冲。 脉冲相对于彼此交错，并且可以由用于在一个或多个时间段驱动发光二极管串的发光二极管驱动器接收。 相移脉宽调制电路可以包括由两个基于计数器的可编程延迟块组成的基于计数器的可编程延迟子电路。