Design of off-axis arranged light-emitting diodes and dual dichroic mirrors based color mixing system for micro-projection display

Chen, Enguo; Yu, Feihong; Guo, Tailiang

doi:10.1364/ao.53.001151

Cited by 5 publications

(2 citation statements)

References 19 publications

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“…Therefore, the light mixing using RGB LEDs is to place the R, G, and B chips in single package and change the light flux of chips or output power by realigning the LED chips or regulating the voltage input to the chips, thus achieving the control of proportion of incident lights and achieving the International Journal of Photoenergy 3 purpose of light mixing. This allows the generation of light mixing effect of multiple colors with the color of light source [18][19][20][21]. The RGB LEDs provide many opportunities for illumination.…”

Section: Introductionmentioning

confidence: 99%

“…The quantity of voltage and current inputted is used to control the RGB colors mix ratio. And, by changing the LEDs array alignment, RGB chips can achieve overlapping colors of light and create the fun of changing colors in light mixing [18][19][20][21]. Therefore, the purpose of this study is to propose an innovative technique of light mixing.…”

Section: Introductionmentioning

confidence: 99%

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Application of the Mechanism Design to Develop the RGB LEDs Color Mixing

Hung

Yang

2015

International Journal of Photoenergy

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The big advantage of LED is the flexible spectral design to make white light using different color mixing schemes. Recently, the color mixing of RGB LEDs is mostly done by sealing all three chips at single package and regulated the mix ratio of these three colors to produce the color of light. And, by changing the LEDs array alignment, RGB chips can achieve overlapping colors of light and create the fun of changing colors in light mixing. Therefore, the purpose of this study is to propose an innovative technique of light mixing. By applying the mechanism design, a RGB light mixing mechanism is produced. Each of the RGB LEDs lamp-type is installed on the couple link of the three mechanisms, respectively. By driving a crank makes the couple link and an output link to produce the relative motion, this will result in the fact that the RGB lamps can project lights on the same plane in order to obtain the color mixing. Unlike mixing technique by control system, this design generates light mixing and changes of color with the synchronized driving of three mechanisms, thus achieving the dazzling perception of single-color lights or mixing of multiple colors for creating ambience of a space.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of the Mechanism Design to Develop the RGB LEDs Color Mixing

Hung

Yang

2015

International Journal of Photoenergy

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Projection optical engine design based on tri-color LEDs and digital light processing technology

Jiang

Lin

et al. 2021

Appl. Opt.

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Digital light processing (DLP) is currently a cutting-edge technology for desktop projection optical engines. Due to the passive luminescence characteristics, the DLP projection engine needs a few specific illumination optical components for light collimation, homogenization, and color combination, together with a projection lens matching the DLP chip and magnifying the image. In this paper, we propose a design approach that first splits the DLP projection optical engine into individual components for separate design, and then integrates them into a whole system for further verification. For the first step, the collimating lens group is designed for light collection, and the dichroic mirrors are used to fold the light path based on tri-color LED light sources. For the second step, a fly-eye lens and the corresponding relay lens group are designed to achieve uniform illumination on the DMD chip. The third step is to optimize the projection lens group for high-resolution projection display. Based on the design and simulation, the optical efficiency is 63.4% and the uniformity reaches 94.9% on the projection screen. The modulation transfer function (MTF) of the projection lens is higher than 0.4 at 66 lines for the distance of 500 ∼ 1500 m m , and the distortion is lower than 1%. Simulation results show that the total luminous flux is estimated to reach 224.15 lm when the powers of tri-color LEDs are 21 W, 15.5 W, and 25 W, respectively. A projector prototype is built and tested for further verification, which provides a luminous flux of 220.43 lm and uniformity of 90.22%, respectively. The proposed design, demonstrated by both simulation and experiment, exhibits high feasibility and application potential in state-of-the-art commercial projector design.

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Design method for the high optical efficiency and uniformity illumination system of the projector

2021

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How to balance the optical efficiency, illumination uniformity and the size of the illumination system is a challenging task in projector design. In this paper, we present a mathematical model describing the relationship between optical energy of the illumination system and the optical parameters and an optimization design method considering the light intensity distribution of the light source. By using the proposed method, two illumination systems are designed with different types of the digital micromirror device chips. In addition, we also propose a non-coaxial system to solve the deformation problem caused by the large flip angle of the DMD chip and further improve the illumination uniformity based on Scheimpflug principle. The optical efficiency and illumination uniformity of the illumination systems were verified and analyzed. The results indicate that the systems designed by the proposed method can provide a good design scheme and obtain a satisfactory utilization rate of the optical energy and higher uniformity.

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Design of off-axis arranged light-emitting diodes and dual dichroic mirrors based color mixing system for micro-projection display

Cited by 5 publications

References 19 publications

Application of the Mechanism Design to Develop the RGB LEDs Color Mixing

Application of the Mechanism Design to Develop the RGB LEDs Color Mixing

Projection optical engine design based on tri-color LEDs and digital light processing technology

Design method for the high optical efficiency and uniformity illumination system of the projector

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