Compact, high‐brightness LED illumination for projection systems

Bruzzone, Charles L.; English, R. Edward; Aastuen, D. J. W.

doi:10.1889/jsid17.12.1043

Cited by 3 publications

(2 citation statements)

References 9 publications

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“…The optical characteristic of a single-panel projector highly depends on the illumination system. A typical illumination system is composed of the light source, the color mixing system, integral components, the beam splitter prism, and the micro-display panel [5,6]. Employing LEDs as light sources, a number of studies have been mainly focused on the integral components, including light pipes [7], lens arrays [8], compound parabolic concentrators [9], or gradual enlarging tapered light pipes [10,11], with few of them paying enough attention to the color mixing system.…”

Section: Introductionmentioning

confidence: 99%

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

Chen

Guo

2014

Appl. Opt.

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A simple but efficient color mixing system for micro-projection display is presented in this paper, which has employed off-axis arranged LEDs and specifically designed dichroic mirrors in order to achieve higher optical efficiency and a better space utilization ratio compared with previous systems. The design method of the dual-dichroic-mirror (DDM) system is investigated both analytically and numerically. The design results are consistent with the theoretical calculation, and the advantages of the proposed DDM system are obvious. Compared with traditional systems that are commonly used in micro-projectors, the DDM system has indicated a much higher collection efficiency (up to 93.36%) with a significantly reduced size of 1.47 cc. Equipped with the DDM system, the designed micro-projector has realized an energy utilization ratio of 76.92% and an irradiance uniformity of 96.59% with an ultra-compact volume of 28.8 mm×28.1 mm×10 mm, which is competent for embedded projection display. It is believed that such a design has good prospects in commercialized production in the future.

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Section: Introductionmentioning

confidence: 99%

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

Chen

Guo

2014

Appl. Opt.

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“…Improving the brightness of such light sources is therefore a key area for manufacturers in the development of mobile projectors. 4 White LEDs have been nominated as the light source with the most potential for general applications in the 21st century. They are a type of cold light source with low power consumption, long component lifetime, and fast reaction time.…”

Section: Introductionmentioning

confidence: 99%

Study on the light delivery to a transmissive‐LCD spatial light modulator used in an LED projector

Lin

2010

J Soc Info Display

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Abstract— The main targeted areas of this study focused on the optical analysis and design verification of light delivery to a transmissive‐LCD spatial light modulator in LED projectors. The behavior and the distribution pattern of the LED light source, its ray path, and its secondary optical performance in the light tube were investigated. Through the use of LightTools, an optical analysis software, an optical engine structure was established to simulate the LED‐light‐source distribution at the outlet of the light tube after passing through the focus lens. Optical experiments, including a goniophotometer, and scanning illumination measurements were then used to compare the results with computer‐software simulation results to ensure rationality and accuracy of the optical simulation. By using the improved approximation method for uniformity, it was found that the most suitable tilting angle for the light tube would be between 49.2° and 49.4°. The value of the light angle for minimal light intensity deviation to occur was found to be 9°. The optimum location for the light source was found to be 1 mm within the center of the light tube and at 35 mm away from the inlet of the light tube; the effect of uniformity was observed.

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65.4: High Brightness LED Based Projector with NTSC 120% Wide Color Gamut

Cheng

Tsai

Wang

et al. 2010

Symp Digest of Tech Papers

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A high brightness LED home theatre projector can achieve up to 870 ANSI lumens with NTSC 120% wide color gamut (equivalent of 1150 lumens in data projector with the same design concept) have been developed. The high brightness is achieved by using the optimized optical design and liquid cooling thermal solution. The optical designs in consideration are the light collection optical system and the lens group between mixing rod and DMD. The light collection system is optimized to obtain 90% coupling efficiency into the mixing rod. The lens group is designed to match the DMD with F number of 2.4 and have optical efficiency of almost 97%. Furthermore, the liquid cooling thermal solution is capable of keeping the LEDs well under 25 o C of the junction temperature limit. Both optical design and thermal solution will be discussed in the paper.

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Compact, high‐brightness LED illumination for projection systems

Cited by 3 publications

References 9 publications

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

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

Study on the light delivery to a transmissive‐LCD spatial light modulator used in an LED projector

65.4: High Brightness LED Based Projector with NTSC 120% Wide Color Gamut

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