Brashear LP will use Three-Five Systems Inc.'s Brillian Z86D-3 microdisplay as the primary display in a weapon for US ground troops. Three-Five will provide Brashear with SVGA microdisplays, ASICs and optics and illumination consultation for the target acquisition and fire control aiming system in the XM29.   . . .   Epistar Corp., of Taiwan, has ordered two additional AIX 2600G3 HT mass-production Reactors from AIXTRON for the production of blue and green LED wafers and chips.