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：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：US07598800B2

公开(公告)日：2009-10-06

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： G05F1/10

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：US08378957B2

公开(公告)日：2013-02-19

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： G09G3/36

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：US20080170012A1

公开(公告)日：2008-07-17

申请号：US11652736

申请日：2007-01-12

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

发明人： Dilip S ,  Gurjit S. 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：US20120176184A1

公开(公告)日：2012-07-12

申请号：US13426322

申请日：2012-03-21

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：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：US20110156600A1

公开(公告)日：2011-06-30

申请号：US12648610

申请日：2009-12-29

申请人： Hendrik Santo ,  Dilip S ,  Timothy James Herklots ,  Kien Vi ,  Ronald William Young ,  Matthew D. Schindler

发明人： Hendrik Santo ,  Dilip S ,  Timothy James Herklots ,  Kien Vi ,  Ronald William Young ,  Matthew D. Schindler

IPC分类号： H05B37/00 ,  G01R31/00

CPC分类号： G01R31/2635

摘要： System(s) and method(s) are provide to efficiently assess performance of a set of light emitting diode (LED) strings in an illumination system. A multiplexer component collects input signal from the one or more LED strings via a first set of one or more monitoring pins, processes the collected input signal, and extracts at least one output signal. The at least one output signal is conveyed to a demultiplexer component through a second set of one or more monitoring pins, wherein the number of elements in the second set of monitoring pins is equal to or smaller than the number of monitoring pins in the first set. The collected input signal is processed in accordance with at least one mode of operation of the multiplexer component, the mode of operation autonomously configured by the demultiplexer component. The multiplexer component can autonomously generate intelligence on operating status of the set of LED strings.

摘要翻译： 提供系统和方法以有效地评估照明系统中的一组发光二极管（LED）串的性能。 复用器部件经由第一组一个或多个监视引脚从一个或多个LED串收集输入信号，处理所收集的输入信号，并提取至少一个输出信号。 所述至少一个输出信号经由第二组一个或多个监视引脚传送到解复用器组件，其中第二组监视引脚中的元件数量等于或小于第一组中监视引脚的数量 。 所收集的输入信号根据复用器组件的至少一种操作模式进行处理，即由解复用器组件自主配置的操作模式。 多路复用器组件可以自主地生成关于该组LED串的操作状态的智能。

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。