Newer optics efficiently mix, dim, and color-tune LED light

Dominguez, Juan Carlos Miñano; Mohedano, Rubén; Gimenez, Pablo Benitez; Álvarez, Roberto Fidel Porto

doi:10.1117/2.1201302.004679

Cited by 5 publications

(4 citation statements)

References 4 publications

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“…Hence, the light color is important in the manufacturing process, but the color selection is mostly limited at the hardware level of a light source. A mixed light source can generate various colors by combining RGB LEDs, and it is constructed by using an optical mixer such as a collimator [4] , micro-lens array [5] , shell mixer [6] , diffuser [7] , or bundle of optical fibers [8] . Although such a mixed light source can generate various colors, the spectral ranges of high-power LEDs are constant.…”

Section: Introductionmentioning

confidence: 99%

Generating selected color using RGB, auxiliary lights, and simplex search

Kim

et al. 2016

International Journal of Optomechatronics

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A mixed light source generates various colors with the potential to adjust the intensities of multiple LEDs, which makes it possible to generate arbitrary colors. Currently, PCs and OSs provide color selection windows that can obtain the red, green, and blue (RGB) or hue, saturation, and lightness (HSL) color coordinates of a user's selection. Mixed light sources are usually composed of primary-colored LEDs with LEDs in auxiliary colors such as white and yellow used in a few cases. The number of LED inputs and the dimming levels are greater than the number of elements in the color coordinate when using auxiliary-colored LEDs, which causes an underdetermined problem. This study proposes a method to determine the dimming levels of LEDs based on a simplex search method (SSM). Commercial LEDs have different optical power values and impure color elements, even if they are RGB. Hence, the characteristics of the LEDs were described using a linear model derived from the tri-stimulus values (an XYZ color coordinate model) and dimming levels. Color mixing models were derived for an arbitrary number of auxiliary-colored LEDs. The underdetermined problem was solved using an SSM without an inverse matrix operation. The proposed method can be applied to a machine vision system and an RGBW light mixer for semiconductor inspection. The dimming levels, obtained using the proposed method showed better optical responses than those derived using other methods.

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Section: Introductionmentioning

confidence: 99%

Generating selected color using RGB, auxiliary lights, and simplex search

Kim

et al. 2016

International Journal of Optomechatronics

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“…[2,3] Hence, the light color is important in manufacturing process but the color selection is limited at the hardware level when using a single light source. A mixed light source can generate various colors by combining RGB LEDs and is constructed using an optical mixer such as a collimator, [4] micro-lens array, [5] shell mixer, [6] diffuser, [7] or bundle of optical fibers. [8] Although such a mixed light source can generate various colors, the spectral ranges of highpower LEDs are constant.…”

Section: Introductionmentioning

confidence: 99%

Generating Selected Color using RGB, Auxiliary Lights, and Simplex Search

Kim

et al. 2015

MATEC Web of Conferences

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Abstract. A mixed light source generates various colors, with the potential to adjust intensities of multiple LEDs, which makes it possible to generate arbitrary colors. Currently, PCs and OSs provide color selection windows that can obtain the RGB or HSL color coordinates of a user's selection. Mixed light sources are usually composed of LEDs in the primary colors, with LEDs in auxiliary colors such as white and yellow used in a few cases. When using auxiliary color LEDs, the number of LED inputs, the dimming levels, is larger than the number of elements in the color coordinate, which causes an under-determined problem. This study proposed how to determine the dimming levels of LEDs based on the selected color. Commercial LEDs have different optical power values and impure color coordinates, even if they are RGB. Hence, the characteristics of the LEDs were described using a linear model derived from the tri-stimulus values (an XYZ color coordinate model) and dimming levels. Color mixing models were derived for the arbitrary number of auxiliary color LEDs. The under-determined problem was solved using a simplex search method without an inverse matrix operation. The proposed method can be applied to a machine vision system and an RGBW light mixer for semiconductor inspection. The dimming levels, obtained using the proposed method were better than derived using other methods.

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“…1 Another newly developed optics system uses minilenses arranged on both the outer and the inner surfaces of a hollow dome that covers the LED chips. 2,3 This dome mixes colored light, which can then be collimated using additional optics. Although these optics mix and project colored light at a distance, they are secondary optical elements that are added to the encapsulating package.…”

mentioning

confidence: 99%

“…Although these optics mix and project colored light at a distance, they are secondary optical elements that are added to the encapsulating package. [1][2][3] We have now developed novel multifunctional LED packaging to simultaneously mix and project color light within the encapsulating lens for simple, color-tunable spotlights. 4 The LED package fulfills three optical functions: light extraction, beam projection, and color mixing.…”

mentioning

confidence: 99%