公开(公告)号：US20020171373A1

公开(公告)日：2002-11-21

申请号：US09820517

申请日：2001-03-29

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Subramanian Muthu

IPC: H05B037/02

CPC classification number: G01J3/51 ,  G01J3/513 ,  G01J2001/4252 ,  G09G3/3406 ,  H05B33/0863 ,  H05B33/0869 ,  Y10S362/80

Abstract: A method and a system for controlling a RBG based LED luminary which tracks the tristimulus values of both feedback and reference whereby the forward currents driving the LED luminary are adjusted in accordance with the errors between the feed tristimulus values and the reference tristimulus values until the errors are zero.

Abstract translation: 一种用于控制基于RBG的LED照明器的方法和系统，其跟踪反馈和参考的三刺激值，由此根据馈入三刺激值与参考三刺激值之间的误差来调节驱动LED发光体的正向电流，直到错误 是零。

公开(公告)号：US20020145041A1

公开(公告)日：2002-10-10

申请号：US09810142

申请日：2001-03-16

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Subramanian Muthu ,  Chin Chang

IPC: G06K007/10

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/0866

Abstract: A device for controlling and adjusting a display light for a retail display system comprising a computer associated with plural light sources for adjusting the light sources to optimally display particular products. The light sources are adjusted based upon a prestored table specifying optimal lighting conditions for each of plural products, and a feedback loop that feeds back actual lighting conditions.

Abstract translation: 一种用于控制和调节用于零售显示系统的显示灯的装置，包括与多个光源相关联的计算机，用于调节光源以最佳地显示特定产品。 基于预先存储的表来调整光源，该表格指定了多个产品中的每一个的最佳照明条件，以及反馈实际照明条件的反馈回路。

公开(公告)号：US20030090605A1

公开(公告)日：2003-05-15

申请号：US10052995

申请日：2001-11-09

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Gert W. Bruning ,  Subramanian Muthu ,  Jeffrey A. Shimizu

IPC: G02F001/1335

CPC classification number: G02F1/133615 ,  G02F1/133524

Abstract: Backlighting is provided for an LCD-TV display by directing light from a source into an open end of a cylindrical drum, the other end of which is closed. The drum has a highly reflective inside surface and a beam is directed through an orifice in the cylindrical wall of the drum. A plurality of optical fibers are positioned with one end of each on a circle coaxial with the drum and the other end of each attached along one edge of the panel to which backlighting is provided. The drum, and thus the beam, is rotated about its axis at constant angular velocity, providing light sequentially to each of the fibers with resulting scrolling of the light across the panel behind the LCD array.

Abstract translation: 通过将来自源的光引导到圆柱形鼓的开口端中，其另一端被封闭，为LCD-TV显示器提供背光。 鼓具有高度反射的内表面，并且梁被引导通过滚筒的圆柱形壁中的孔口。 多个光纤被定位成其一端分别与滚筒同轴的圆周上，而每个光纤的另一端沿着设置有背光的面板的一个边缘。 鼓以及因此的光束以恒定的角速度围绕其轴线旋转，顺序地向每个光纤提供光，从而导致光穿过LCD阵列后面板的滚动。

公开(公告)号：US20020195541A1

公开(公告)日：2002-12-26

申请号：US09827629

申请日：2001-04-06

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Subramanian Muthu ,  Arjen Gerben Van Der Sijde

IPC: G01J001/32

CPC classification number: H05B33/086 ,  H05B33/0869

Abstract: A light output control system for implementing a method for sensing the tri-stimulus values for controlling a light output illuminated from an LED based luminary is disclosed. The system comprises one or more filter/photo diode sensors for sensing a first set of tri-stimulus values of the light output and providing signals indicative thereof. The signals are utilized in a transformation matrix whereby a second set of tri-stimulus values is obtained. The system controls the light output as a function of the second set of tri-stimulus values.

Abstract translation: 公开了一种用于实现用于感测用于控制从基于LED的发光体照射的光输出的三刺激值的方法的光输出控制系统。 该系统包括一个或多个滤光器/光电二极管传感器，用于感测光输出的第一组三激励值，并提供指示其的信号。 这些信号用于转换矩阵，从而获得第二组三刺激值。 系统控制光输出作为第二组三重刺激值的函数。

公开(公告)号：US20030230991A1

公开(公告)日：2003-12-18

申请号：US10173346

申请日：2002-06-17

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Subramanian Muthu ,  Frank J. Schuurmans ,  Chin Chang ,  James Gaines

IPC: G05F001/00

CPC classification number: G09G3/3413 ,  G09G2320/043 ,  G09G2320/0606 ,  G09G2320/0626 ,  G09G2320/0633 ,  G09G2320/064 ,  G09G2320/0666 ,  G09G2360/145 ,  H05B33/0869 ,  H05B33/0872

Abstract: Apparatus and method for backlighting an electronic display with LEDs to control luminosity, radiometric power, and color levels by means of feedback control through a microprocessor, thereby maintaining white backlight at substantially constant levels, which can be chosen by an operator.

Abstract translation: 用于用LED背光的电子显示器的装置和方法，以通过微处理器的反馈控制来控制亮度，辐射功率和色彩水平，从而将白色背光保持在基本恒定的水平，这可以由操作者选择。

公开(公告)号：US20030066945A1

公开(公告)日：2003-04-10

申请号：US09972111

申请日：2001-10-05

Applicant: Koninklijke Philips Electronics N.V.

Inventor： Subramanian Muthu ,  Frank Schuurmans

IPC: G01J001/32

CPC classification number: H05B33/0818 ,  H05B33/0869 ,  H05B33/0872

Abstract: An LED array is controlled by determining a constant relating the peak light output of an LED to the peak driving current of a PWM pulse driving the LED, and multiplying the average current of the PWM pulse by the constant to obtain a value of average light output for the LED. The constant may be determined by simultaneously measuring peak light output of the LED and peak current of a PWM pulse driving the LED. The constant is then calculated by dividing the peak light output by the peak current of the PWM pulse. By making the simultaneous measurements at a time during the duration of the PWM pulse where the pulse has reached its full magnitude, rise and fall times of the pulse do not affect the measurements. The average current of the PWM pulse may be determined by a variety of methods including integrating current in the PWM pulse over time, or passing the PWM current through a low pass filter configured for providing an average value of PWM current. Determining average current in this manner further reduces the effect of rise and fall time on determining the average light output of the LED.

Abstract translation: 通过确定将LED的峰值光输出与驱动LED的PWM脉冲的峰值驱动电流相关联的常数来确定LED阵列，并将PWM脉冲的平均电流乘以常数以获得平均光输出的值 为LED。 该常数可以通过同时测量LED的峰值光输出和驱动LED的PWM脉冲的峰值电流来确定。 然后通过将峰值光输出除以PWM脉冲的峰值电流来计算常数。 通过在脉冲达到其全部幅度的PWM脉冲的持续时间期间进行同时测量，脉冲的上升和下降时间不会影响测量。 PWM脉冲的平均电流可以通过各种方法来确定，包括随时间积分PWM脉冲中的电流，或者通过配置成提供PWM电流的平均值的低通滤波器来传递PWM电流。 以这种方式确定平均电流进一步降低了上升和下降时间对确定LED的平均光输出的影响。