The DLP991U DMD is a 0.99-inch diagonal spatial light modulator that consists of an array of highly reflective aluminum micromirrors. The DMD is an electrical input, optical output micro-electrical-mechanical system (MEMS). The input electrical data interface is a differential high-speed serial interface (HSSI). The DMD consists of a two-dimensional array of 1-bit CMOS memory cells. The array is organized in a grid of M memory cell columns by N memory cell rows. Refer to Figure 5-14. The positive or negative deflection angle of the micromirrors can be individually controlled by writing a '1' or a '0' to each memory cell thereby changing the address voltage of underlying CMOS addressing circuitry.

To ensure reliable operation, the DLP991U DMD must always be used with the TI-provided DLPC964 industrial controller.