Red, green and blue LED-based white light source: implementation challenges and control design

Muthu, S.; Gaines, J. H.

doi:10.1109/ias.2003.1257549

Cited by 95 publications

(42 citation statements)

References 2 publications

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“…1 [6]. Indirect temperature compensation techniques like sensing the temperature of the heat sink on which the LEDs are mounted [7] or the method of two-diode driving voltages [3] Fig. 5.…”

Section: Overview Of Rgb Led Color Controlmentioning

confidence: 99%

Color Control System for RGB LED Light Sources Using Junction Temperature Measurement

Wong

Tse

2007

IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-The efficiency of LED lights is approaching that of fluorescent lamps. LED light sources are finding more applications than conventional light bulbs due to their compactness, lower heat dissipation, and most importantly, real-time color changing capability. Accurate control of colors for RGB LED lights is a challenging task, which includes optical color mixing, color light intensity control and color point maintenance due to LED junction temperature change and device aging. In this paper , we present a LED junction temperature measurement technique for a pulse width modulation (PWM) diode forward current controlled RGB LED lighting system. The technique can control the color effectively without the need for using expensive feedback systems involving light sensors. Performance of chromaticity and luminance stability for a temperature compensated RGB LED system will be presented.

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“…1 [6]. Indirect temperature compensation techniques like sensing the temperature of the heat sink on which the LEDs are mounted [7] or the method of two-diode driving voltages [3] Fig. 5.…”

Section: Overview Of Rgb Led Color Controlmentioning

confidence: 99%

Color Control System for RGB LED Light Sources Using Junction Temperature Measurement

Wong

Tse

2007

IECON 2007 - 33rd Annual Conference of the IEEE Industrial Electronics Society

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“…In practical design, an external inductor L e is usually needed to be added in series connected with L l for satisfying ZVS condition [26][27][28]. The input current has a near sinusoidal waveform and in phase with the input voltage.…”

Section: Single-stage Led Backlight Circuitmentioning

confidence: 99%

Introduction to LED Backlight Driving Techniques for Liquid Crystal Display Panels

Chiu¹,

Lo²,

Pai³

et al. 2009

New Developments in Liquid Crystals

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“…Bit weights gray modulation controls the scanning driver to output logic effective value according to the weights of the gray [13]. Suppose each pixel in the image using n data bits to represent its gray value (N= 2 n gray levels), any one pixel of the image, in order to achieve its desired display gray scale, the data of lowest bit of the pixel is firstly sent to the display system and delayed a fixed time which defined by the lowest bit according to the corresponding weight value.…”

Section: B Bit Weights Gray Modulationmentioning

confidence: 99%

The Realization of Gray Scale Control for AM-OLED Based on Fractal theory

Ma¹,

Ran²,

Huang³

et al. 2013

Proceedings of the International Conference on Computer, Networks and Communication Engineering (ICCNCE 2013)

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-Fractal theory was firstly applied in gray scale control of Active Matrix/Organic Light Emitting Diode (AM-OLED) display system, which settled the problem of time redundancy of traditional scanning methods. In the experiment, a fractal scanning controller was designed and applied in a AM-OLED matrix display with 12 by 12 pixels. Timing simulation results indicate that compared with the traditional scanning methods, the novel method can improve scanning efficiency evidently, especially in the case of high gray scale and large screen. Therefore, the method provides a new way to solve the bottle problem of high articulation multimedia FPDs development.

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Red, green and blue LED-based white light source: implementation challenges and control design

Cited by 95 publications

References 2 publications

Color Control System for RGB LED Light Sources Using Junction Temperature Measurement

Color Control System for RGB LED Light Sources Using Junction Temperature Measurement

Introduction to LED Backlight Driving Techniques for Liquid Crystal Display Panels

The Realization of Gray Scale Control for AM-OLED Based on Fractal theory

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