Improvement of the blue-color quenching and optical efficiency of laser for the head-up display

This paper presents an examination of the control of optical quenching according to the junction temperature of a high-brightness laser. A high-brightness blue laser source is being reviewed for head-up display). The laser is problematic, however, because its luminous efficiency, and hence its lifetime, is reduced due to its low laser junction temperature, and particularly due to its blue optical quenching, which is a disadvantageous characteristic. This problem was addressed by applying a current supply method with a high-frequency pulse width modulation (PWM) scheme and a digital micro-mirror device panel based on a method using a color wheel that uses yellow phosphor material. PWM of the frequency and analysis and optimization of the duty ratio enabled the prevention of the optical quenching of the blue laser to obtain high optical efficiency.