Patent ID: 7336686

Claim:
A laser display apparatus comprising: a laser comprising a first mirror and a second mirror that are separated by a cavity distance and form a cavity; and a spatial modulator modulating light transmitted through the first mirror of the laser to display an image on a screen, wherein, when a coherence length l c and an effective reflectivity R of the laser are defined by the following equation: l c = 2 ⁢ d ⁢ ⁢ π ⁢ ⁢ R 1 / 2 1 - R R = R 1 × R 2 [ Equation ] where d is the cavity distance of the laser, R 1 is the reflectivity of the first mirror, and R 2 is the reflectivity of the second mirror, the coherence length l c satisfies the following inequality: 0 <l c ≦0.85[cm].