公开(公告)号：US20080290804A1

公开(公告)日：2008-11-27

申请号：US11805525

申请日：2007-05-22

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

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

IPC分类号： H05B41/36

CPC分类号： H05B33/0854

摘要： The present invention provides a controller for regulating current in LEDs in electronic displays. The controller uses temperature sensing diodes to detect changes in the LED ambient temperature. As the LED ambient temperature changes, the forward voltage of the temperature sensing diode decreases. A signal processor adjusts the current passing through the LEDs based on the temperature induced changes in the forward voltage of the temperature sensing diodes. The present invention can reduce costs over the present methods of regulating current in LEDs and may more easily be integrated into a single integrated circuit chip. The temperature sensing may also be implemented outside the integrated circuit chip.

摘要翻译： 本发明提供一种用于调节电子显示器中的LED中的电流的控制器。 控制器使用温度感应二极管来检测LED环境温度的变化。 随着LED环境温度的变化，温度感应二极管的正向电压降低。 信号处理器根据温度感应二极管正向电压的变化来调节通过LED的电流。 本发明可以降低LED中调节电流的现有方法的成本，并且可以更容易地集成到单个集成电路芯片中。 也可以在集成电路芯片之外实现温度感测。

公开(公告)号：US07777704B2

公开(公告)日：2010-08-17

申请号：US11652736

申请日：2007-01-12

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

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

IPC分类号： G09G3/32

CPC分类号： G09G3/3413 ,  G09G2320/064 ,  H05B33/0815 ,  H05B33/0827 ,  Y02B20/346

摘要： The present invention relates to displays that use LED strings for backlighting. A lead string is provided with continuous drive voltage and the non-lead strings are provided with pulsed drive pulses. The string having the highest forward voltage is selected as the lead string. Feedback information indicative of the currents flowing through the non-lead strings is used to determine the duty cycles of the voltage pulses provided to drive the non-lead strings. The non-lead strings are controlled using pulsed drive voltages to minimize power dissipation in the circuit.

摘要翻译： 本发明涉及使用LED串进行背光照明的显示器。 引线串具有连续驱动电压，非引线串提供脉冲驱动脉冲。 选择具有最高正向电压的串作为引线串。 指示流经非引线串的电流的反馈信息用于确定为驱动非引线串提供的电压脉冲的占空比。 使用脉冲驱动电压来控制非引线串，以最小化电路中的功耗。

公开(公告)号：US07663326B2

公开(公告)日：2010-02-16

申请号：US11805525

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： H05B33/0854

摘要： The present invention provides a controller for regulating current in LEDs in electronic displays. The controller uses temperature sensing diodes to detect changes in the LED ambient temperature. As the LED ambient temperature changes, the forward voltage of the temperature sensing diode decreases. A signal processor adjusts the current passing through the LEDs based on the temperature induced changes in the forward voltage of the temperature sensing diodes. The present invention can reduce costs over the present methods of regulating current in LEDs and may more easily be integrated into a single integrated circuit chip. The temperature sensing may also be implemented outside the integrated circuit chip.

摘要翻译： 本发明提供一种用于调节电子显示器中的LED中的电流的控制器。 控制器使用温度感应二极管来检测LED环境温度的变化。 随着LED环境温度的变化，温度感应二极管的正向电压降低。 信号处理器根据温度感应二极管的正向电压的变化来调节通过LED的电流。 本发明可以降低LED中调节电流的现有方法的成本，并且可以更容易地集成到单个集成电路芯片中。 也可以在集成电路芯片之外实现温度感测。

公开(公告)号：US20090267652A1

公开(公告)日：2009-10-29

申请号：US12111114

申请日：2008-04-28

申请人： Hendrik Santo ,  Kien Vi ,  Dilip S

发明人： Hendrik Santo ,  Kien Vi ,  Dilip S

IPC分类号： H03K5/153

CPC分类号： H03K17/18

摘要： The present invention relates to circuits and methods for detecting transistor operation in the triode region including a circuit for a transistor in a constant current source. The circuit comprises a detector having a first input, a second input, and an output. The first input of the detector is coupled to the source of the transistor and the second input of the detector is coupled to the set point terminal of the constant current source. The circuit also comprises a flag coupled to the detector output. The detector has parameters selected so that, when the voltage at the source of the transistor satisfies a reference condition, the output of the detector sets the flag. The reference condition is established relative to the voltage at the set point terminal of the constant current source and relative to the triode transition voltage of the transistor at a selected drain-source current.

摘要翻译： 本发明涉及用于检测三极管区域中的晶体管工作的电路和方法，包括恒流源中的晶体管的电路。 电路包括具有第一输入，第二输入和输出的检测器。 检测器的第一输入耦合到晶体管的源极，并且检测器的第二输入端耦合到恒流源的设定点端子。 电路还包括耦合到检测器输出的标志。 检测器具有选择的参数，使得当晶体管的源极处的电压满足参考条件时，检测器的输出设置标志。 相对于恒定电流源的设定点端子处的电压并且相对于所选择的漏极 - 源极电流下的晶体管的三极管转换电压，建立参考条件。

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：US20080170085A1

公开(公告)日：2008-07-17

申请号：US11652739

申请日：2007-01-12

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

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

IPC分类号： G09G5/00

CPC分类号： H05B33/0827 ,  G09G3/3406 ,  G09G3/342 ,  G09G2320/0626

摘要： The present invention provides a controller for controlling strings of LEDs in a liquid crystal display. The hybrid controller uses both analog and digital circuit components. Error amplifiers are used to compare analog feedback signals received from the LED strings with reference signals. The results of those comparisons are converted to digital data and processed by a digital signal processor (DSP). The DSP calculates the drive voltages for the LED strings based on the deviation between the actual current flows (represented by feedback signals) and the desired current flows (represented by reference signals) through the LED strings. Analog drivers provide the drive voltages to the LED strings.

摘要翻译： 本发明提供一种用于控制液晶显示器中的LED串的控制器。 混合控制器使用模拟和数字电路组件。 误差放大器用于将从LED串接收的模拟反馈信号与参考信号进行比较。 这些比较的结果被转换成数字数据并由数字信号处理器（DSP）处理。 DSP根据通过LED串的实际电流（由反馈信号表示）与期望的电流（由参考信号表示）之间的偏差来计算LED串的驱动电压。 模拟驱动器为LED串提供驱动电压。

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：US20090128053A1

公开(公告)日：2009-05-21

申请号：US11942239

申请日：2007-11-19

申请人： Tushar Heramb Dhayagude ,  Dilip S ,  Hendrik Santo ,  Anjan Sen

发明人： Tushar Heramb Dhayagude ,  Dilip S ,  Hendrik Santo ,  Anjan Sen

IPC分类号： H05B37/02

CPC分类号： H05B33/0827 ,  G09G3/2085 ,  G09G3/2088 ,  G09G3/3426 ,  G09G2320/029 ,  G09G2320/04 ,  G09G2320/064 ,  G09G2330/021 ,  H05B33/0851

摘要： The present invention discloses apparatus and techniques for modular backlighting control of a display. The display includes a number of strings of LEDs. The display is divided into several sections, and each section includes one or more strings of LEDs. A local controller is assigned to each section. The local controller receives feedback signals from the strings of LEDs in its sections and controls the drive voltages and drive currents of those strings. The local controllers communicate with each other and also with the main system controller.

摘要翻译： 本发明公开了一种用于显示器的模块化背光控制的装置和技术。 显示器包括多个LED串。 显示器分为几个部分，每个部分包括一个或多个LED串。 每个部分分配一个本地控制器。 本地控制器在其部分中从LED串中接收反馈信号，并控制这些串的驱动电压和驱动电流。 本地控制器相互通信，并与主系统控制器进行通信。

公开(公告)号：US5617015A

公开(公告)日：1997-04-01

申请号：US477455

申请日：1995-06-07

申请人： Dimitry Goder ,  Hendrik Santo

发明人： Dimitry Goder ,  Hendrik Santo

IPC分类号： G05F1/56 ,  H02M3/155

CPC分类号： H02M3/155 ,  G05F1/56 ,  H02M2001/009

摘要： A switching voltage regulator is described which provides multiple independently regulated outputs. A switch control independently monitors two or more voltage outputs and generates control signals for driving a main switch and two or more auxiliary switches to charge selective ones of the outputs which have fallen below their target voltages. Time sequencing techniques are utilized to control the switching of the auxiliary switches such that energy stored in an inductor is transferred to the appropriate voltage outputs. The switching voltage regulator may be implemented as an integrated circuit and may have various topologies, such as boost, buck, flyback or SEPIC.

摘要翻译： 描述了提供多个独立调节输出的开关电压调节器。 开关控制独立地监视两个或更多个电压输出，并且产生用于驱动主开关和两个或更多个辅助开关的控制信号，以对低于其目标电压的选择性输出进行充电。 利用时间排序技术来控制辅助开关的切换，使得存储在电感器中的能量转移到适当的电压输出。 开关电压调节器可以被实现为集成电路，并且可以具有各种拓扑，例如升压，降压，反激或SEPIC。

公开(公告)号：US20090230882A1

公开(公告)日：2009-09-17

申请号：US12046280

申请日：2008-03-11

申请人： Hendrik Santo ,  Ranajit Ghoman ,  S. Dilip

发明人： Hendrik Santo ,  Ranajit Ghoman ,  S. Dilip

IPC分类号： H05B37/02 ,  H03K5/01 ,  H03K5/00

CPC分类号： H05B33/0842

摘要： The present invention involves an electrical system in which an analog signal channel passes through various integrated circuit chips (ICs). The channel can carry one or more analog signals. Each IC can modify the signal(s) passing through it and pass it on to another IC or system component. The channel can be programmable. Each IC can include a comparator or a multiplexor to receive the channel signal from another IC or system component and to modify the received signal before transmitting it to another IC or system component. The comparator or the multiplexor can be programmable and can be selectively configured to compare the incoming signal from the channel with a variety of other signals and thresholds, or to simply act as a flow through gate and allow the signal to pass without any modification. The comparison can determine the output of the comparator. The operation and programming of the comparators, the multiplexors and the channel can be centrally controlled by a system controller, can be independently controlled by the ICs, or a combination thereof.

摘要翻译： 本发明涉及一种电气系统，其中模拟信号通道通过各种集成电路芯片（IC）。 通道可以携带一个或多个模拟信号。 每个IC可以修改通过它的信号并将其传递到另一个IC或系统组件。 通道可编程。 每个IC可以包括比较器或多路复用器，以从另一个IC或系统组件接收信道信号，并且在将其发送到另一IC或系统组件之前修改接收的信号。 比较器或多路复用器可以是可编程的，并且可以被选择性地配置为将来自信道的输入信号与各种其他信号和阈值进行比较，或者简单地充当通过门的流，并允许信号通过而不进行任何修改。 比较可以确定比较器的输出。 比较器，多路复用器和通道的操作和编程可以由系统控制器集中控制，可以由IC独立控制或其组合。