Patent ID: 8044977

Claim:
A method of operating a data driver for a display, comprising: generating L gray scale reference currents simultaneously, the L gray scale reference currents comprising K gamma reference current groups and being associated with non-zero gray scale levels, each of the K gamma reference current groups having M of the L scale reference currents as gamma reference currents; selecting M gamma reference currents, which are included in one of the K gamma reference current groups, from the L gray scale reference currents responsive to a gamma signal; generating a zero gray scale level gamma reference voltage; selecting one of the M gamma reference currents or the zero gray scale level gamma reference voltage responsive to a color signal; and generating a data current responsive to the selected one of the M gamma reference currents or zero gray scale level gamma reference voltage; wherein L is greater than one; and wherein generating the L gray a scale reference currents comprises generating the L gray scale reference currents using a current mirror comprising L transistors having L different widths.