Patent ID: 6967634

Claim:
A display driver circuit which drives an electro-optical device having scan electrodes and signal electrodes by using a multi-line selection that selects three scan electrodes simultaneously, the display driver circuit comprising: first to m-tb (m is a natural number) decoder circuits which are provided for respective bits of each of first to third grayscale data and output decoded output signals based on a field signal and the respective bits of each of the first to third grayscale data, the first to third grayscale data being m-bit data and corresponding to a scan pattern of the three scan electrodes; a pulse width modulation signal conversion circuit which modulates pulse width of m bits of the decoded output signals output from the first to m-th decoder circuits; and a signal electrode driver circuit which drives the signal electrode based on signals, pulse width of which is modulated by the pulse width modulation signal conversion circuit, wherein an i-th (i is a natural number equal to or greater than one and equal to or less than m) decoder circuit outputs one of the decoded output signals corresponding to the field signal, by using a result of a given operation executed on a display pattern and a dummy pattern corresponding to the display pattern, based on an orthogonal function which defines the scan pattern of the three scan electrodes in each field and a scan pattern of a virtual scan electrode corresponding to the scan pattern of the three scan electrodes, the display pattern being corresponding the i-bit data of the first to third grayscale data; and wherein the signal electrode driver circuit drives the signal electrode by using one of two potential levels based on the signals, pulse width of which is modulated by the pulse width modulation signal conversion circuit.