Every blue LED DMD on the market has grid sections as far as I know, if you want to avoid them put a ColorDMD in and set it to blue. Bonus, you can try the blend modes, and it maybe be possible to sync the color to Eli's ramp mod soon.
I picked up my Tron Friday night and I'm loving it. Kicking my ass, got to Sea of Simulation and promptly drained. Got the arcade mod installed, wired up my light cycles, and I'm working on custom LEDing a recognizer, gonna get them all interactive with a Pig 2. Eli ramp mod upacked but I haven't touched the installation yet. Have to stop playing first so I can take off the ramps!