Maximizing optical efficacy and color gamut in projection applications by combining four laser wavelengths

Ian Wallhead; Roberto Ocaña

doi:10.1117/12.2052163

15 May 2014 Maximizing optical efficacy and color gamut in projection applications by combining four laser wavelengths

Ian Wallhead, Roberto Ocaña

Proceedings Volume 9138, Optics, Photonics, and Digital Technologies for Multimedia Applications III; 91380G (2014) https://doi.org/10.1117/12.2052163
Event: SPIE Photonics Europe, 2014, Brussels, Belgium

Abstract

Laser projection devices should be designed to maximize their luminous efficacy and color gamut. This is for two main reasons. Firstly, being either stand alone devices or embedded in other products, they could be powered by battery, and lifetime is an important factor. Secondly, the increasing use of lasers to project images calls for a consideration of eye safety issues. The brightness of the projected image may be limited by the Class II accessible emission limit. There is reason to believe that current laser beam scanning projection technology is already close to the power ceiling based on eye safety limits. Consequently, it would be desirable to improve luminous efficacy to increase the output luminous flux whilst maintaining or improving color gamut for the same eye-safe optical power limit. Here we present a novel study about the combination of four laser wavelengths in order to maximize both color gamut and efficacy to produce the color white. Firstly, an analytic method to calculate efficacy as function of both four laser wavelengths and four laser powers is derived. Secondly we provide a new way to present the results by providing the diagram efficacy vs color gamut area that summarizes the performance of any wavelength combination for projection purposes. The results indicate that the maximal efficacy for the D65 white is only achievable by using a suitable combination of both laser power ratios and wavelengths.

Citation Download Citation

Ian Wallhead and Roberto Ocaña "Maximizing optical efficacy and color gamut in projection applications by combining four laser wavelengths", Proc. SPIE 9138, Optics, Photonics, and Digital Technologies for Multimedia Applications III, 91380G (15 May 2014); https://doi.org/10.1117/12.2052163

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KEYWORDS

Eye

Projection systems

Safety

Laser applications

Lead

Pico projectors

Laser safety

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