In this paper, we propose an innovative adaptive automotive headlamp design that incorporates a volume holographic optical element (VHOE) as a beam splitter. The VHOE is recorded with an infrared divergent spherical wave, allowing for the efficient combination of both time-of-flight (ToF) laser beam and miniLED imaging automotive headlamp. By exploiting the Bragg selectivity property of the VHOE, only the ToF light is affected while the imaging headlamp light passes through unaffected. This facilitates the adaptation of the automotive headlamp to different lighting conditions, providing enhanced visibility and safety for drivers. The ToF laser beam provides accurate depth information, while the miniLED can create a high-contrast cut-off line. The VHOE beam splitter enables the effective combination of these two lighting sources, ensuring that each is used to its full potential. Our design offers a promising solution for adaptive automotive headlamp systems that could potentially improve driver safety on the road.
In this study, we first focus on the study of the mass-productive Fresnel lens in the HCPV to calculate the amount of the leakage light. Then we will study the leakage light by the natural factor, such as clear sky, light cloud, medium cloud, and heavy cloud. Finally, we will summarize the characteristic of the light leakage in HCPV in considering the engineering and natural factors.
We introduce a current development in optical design for vehicle forward lighting based on solid-state lighting, in particular, phosphor-converted white LEDs. The vehicles include bicycles, bikes, and automobiles. Although the requirements regulating different vehicles are different, the low beam always requires a high-contrast cutoff line. Three optical design approaches are discussed; these include a projection lens incorporated with a baffle or beam shaper, multisegment reflectors, and complex lenses. A new design approach called light field management technology for the multisegment reflector is introduced. In addition, the possible related manufacturing errors and the robustness of different optical approaches are analyzed. Finally, we introduce three approaches to adaptive forward lighting that provide a driver with brighter and clearer vision without inducing glare to people on the roadway. The application of video projection technology to roadway illumination could be a trend of vehicle forward lighting based on solid-state lighting.
We present the results of this study of a calculation model built for predicting the spectrum of white-light LED (WLLED) with different concentration formula of three kinds of the phosphor. First, we analyze the spectrum of the blue light LED with different penetrating concentrations of the phosphor. Next, we analyze the emission spectrum after absorption of blue light by the phosphor and the re-absorption effect. Then, we introduce the re-absorption effect into the superimposed spectrum of blue light and the emitting light. Finally, we compare the superimposed spectrum with the experimental result. By this method, we can predict the behavior of the WLLED, such as optical efficiency, chromaticity coordinates, correlated color temperature (CCT), and color rendering. Thus, we obtain the weight ratio of the multi-color mixed phosphor (MCP) of high color rendering WLLED.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.