Optoelectronic apparatus includes a semiconductor die and a monolithic array of light-emitting elements formed on the semiconductor die in a grid pattern comprising multiple columns. Conductors formed on the die define a respective common contact for driving each column of the light-emitting elements. A diffractive optical element (DOE) is configured to project multiple replicas of a pattern of stripes generated by the light-emitting elements, each stripe corresponding to a respective one of the columns.