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

Figures & data

Figure 1. Optical configuration with laser and a DMD panel.

Figure 2. Spoke time (color transition zone) and phosphor wheel using laser.

Figure 3. Case temperature according to the threshold current of laser.

Figure 4. Color quenching of the blue laser according to the stem temperature.

Figure 5. Current driving schematic of the laser module.

Table 1. Duty ratio and wavelength of blue laser.

PWM Duty (%)	Wavelength (nm)	FWHM (nm)	x, y color coordinate
10	441	5.77	(0.1672, 0.02191)
20	441	5.66	(0.1654, 0.01809)
30	441	5.58	(0.1644, 0.01605)
40	441	5.55	(0.164, 0.01563)
50	441	5.55	(0.1636, 0.01504)
60	441	5.64	(0.1636, 0.01481)
70	441	5.70	(0.1637, 0.01476)
80	442	5.66	(0.1638, 0.01505)
90	442	5.49	(0.164, 0.01587)
100	442	5.45	(0.164, 0.01671)

Figure 6. Radiant flux and duty ratio of PWM driving.

Figure 7. Optical relative efficiency and driving method of laser.