LEAF LED headlamps (4): The future strives to use only one white LED

City Light Industry has proposed the goal of a new generation of LED headlamps, which is to realize the integration of the high beam and low beam light sources. Each headlamp uses only one LED. The goal is to reduce power consumption and reduce cost, size, and weight by reducing the number of components. The company is currently advancing towards this goal. The LED headlamps introduced this time use halogen lamps in the high beam and two white LEDs in the low beam.

How can I reduce these lights to one? Simply put, it is possible to increase the number of white LED mounted LED chips from the current four to eight, or to increase the current input white LED by a factor of two. But these are not the best policy. Increasing the number of LED chips will increase the cost. When the input current is increased, the heat density on the LED chip rises, which further increases the junction temperature of the LED chip, resulting in a decrease in luminous efficiency. And in doing so, the white LED is also easy to store heat.

However, white LED technology is also progressing year by year. City Light Industry expects to obtain white LEDs with brightness more than twice and more than 1000 lm in 2 to 3 years. Even if the junction temperature rises, white LEDs with high luminous efficiency will be developed in the future, and the luminous efficiency will be further improved by lowering the thermal resistance and improving the heat dissipation. Philips Lumileds Lighting, which developed the white LED used this time, announced that it was developing a white LED with a brightness of more than 1000 lm when it delivered a keynote speech at "Green Device 2010" in November 2010.

When the brightness exceeds 1000 lm, the LED headlight can be realized with one white LED. City Light Industry is developing LED headlamps that use only one white LED. Although the relevant details have not yet been announced, it says that “it will be produced soon on the research level” (P2P3 first project team of Research and Development Department of Shiguang Industrial Development Division) The person in charge is Murakami Katsuhide). The company did not explicitly state when a white LED headlamp would reach a practical level, but technically, it is not surprising that “the market is popular in five years” (Village Bridge).

When Shikoko Co., Ltd. began to jointly develop the LED headlamps in 2005, it is "very difficult" to obtain sufficient brightness with two white LEDs (village bridge). However, in view of the technological advancement of white LEDs, the company is still working on the design of using two white LEDs. The company is currently developing a design that uses only one white LED based on the idea of ​​white LED technology advancement.

1 white LED is the new starting point

City Light Industry said that LED headlamps with a white LED are not the end point. Although white LEDs typically use multiple LED chips to achieve sufficient brightness, the company intends to reduce the number of LED chips to further reduce costs as LED chips improve performance. If this goal is achieved, it is expected to reduce the size of white LEDs. And when white LEDs become small and cheap, it is possible to use multiple white LEDs to advance the advancement of variable light distribution systems.

City Light Industry said that the company also considers semiconductor lasers as a new generation of light sources after LEDs. The semiconductor laser can separate the light emitting portion and the heat generating portion (semiconductor laser) by connecting the optical fibers. In other words, the part required for the heat dissipation design can be taken out of the headlights, so that the heat dissipation design can be implemented without considering the shape of the headlights. However, LED headlamps still have a lot of room for improvement in the future, so the use of semiconductor lasers requires long-term consideration.

A technician involved in the development of LED headlamps.
The central government is the representative of the development of the business of the city's light industry LED headlamps, Kwon Kwon (the head of the P2P3 project team of the research and development department of the City Light Industry Development Division), and the left is the Kikuchi and the heavy (the simulation of the core engineering department of the Shikoku Industrial Development Division) Senior expert (analytical technology) senior engineer), and Iwasaki Kazuyoshi (head of simulation department of core engineering department of Shikoku Industrial Development Division).

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