The current generations of long wavelength infrared focal plane array based sensor systems require complex, dynamic imagery for performance testing. We propose to design a target array held at cryogenic temperature with the array elements heated by an electron beam. Proper design of the array target will allow complex thermal imagery to be generated from either computer graphics or stored and processed video images. By designing the array to properly manage the heat transfer out of the array elements, dynamic changes in the target image can be realized.