Column-Scanned Architecture
The Laser Projector derives its enormous resolution advantage from the fact that it emits a moving column of light, as opposed to a single-pixel beam, or point light source. This also turns out to be an advantage in terms of safety, since the light output is similarly less concentrated.
We have illustrated how a portion of the GLV modulates a single pixel. But, in fact, the GLV is a linear array of many of these multi-ribbon elements, such that an entire column of pixels can be modulated at once. By illuminating the GLV with a column of light and then sweeping the modulated result across the screen, a dynamic projection display is achieved.
Another advantage of this type of mechanical scanning system is its simplicity and reliability. The only moving part in the system is a single motor-driven mirror that sweeps across the screen, and this part rotates at a relatively low frequency of 60-120Hz typically. This is essentially the same type of scanning mirror as used at a common grocery-store checkout counter, and is extremely reliable.