| 摘要 |
PROBLEM TO BE SOLVED: To provide a drive method of semiconductor laser and a display system capable of reducing speckle noises without increasing the cost.SOLUTION: A semiconductor laser is driven a drive current of a rectangular wave with a pulse width of 0.4-2 ms. Since the pulse width is narrow, the temperature of an active layer in a semiconductor laser does not reach steady temperature during supplying the pulse of drive current. Therefore, the temperature of the active layer and the oscillation wavelength continuously increase during driving the semiconductor laser. As a result, since the half width of the spectrum gets wider, speckle noises can be reduced without increasing the cost.SELECTED DRAWING: Figure 3 |
