Charge-coupled-device imagers have great potential to replace photographic film for recording cathode ray tube (CRT) displays. The basic problem, detection of electrons impacting with variable densities on a sensing screen, implies high sensitivity for single-electron detection. Few data have been published on CCD performance in this regime, especially as one component of a complete readout system. We report on the basic sensitivity and resolution of one possible system, the electron beam and phosphor coupled with fiber optics to a thermoelectrically cooled CCD camera. Observed performance indicates that present sensitivity is several CRT beam electrons per pixel and that resolutions of 25 Âµm trace width present no problem. Improved experiments are expected to yield single-electron detection capability in the near future. The outlook for broad use of this readout in oscilloscopes, streak tubes, and imagers is discussed with regard to this performance.