Patent ID: 8081179

Claim:
A method to display gray shades using a root mean squared (RMS) responding matrix display comprising acts of: (a) selecting a select voltage (r i ) from a first predefined set of s number of select voltages, wherein s is an integer greater than 2; (b) during a predetermined time interval (t i ), selecting a row of the matrix display by applying the select voltage (r i ) to the row while all other rows of the matrix display are grounded; (c) selecting a data voltage (d i ) from a second predefined set of 2s number of data voltages during the predetermined time interval (t i ), the 2s number of data voltages consisting of a positive and a negative value of each of s number of predetermined voltage amplitudes; (d) applying the data voltage (d i ) to all of the columns of the matrix display simultaneously during the time interval (t i ); and (e) repeating (a) - (d) during s−1 number of future time intervals including selecting and applying a different one of the s select voltages and a different one of the s predetermined voltage amplitudes during each of the s−1 future time intervals such that each of the s select voltages and the s predetermined voltage amplitudes is selected and applied only once over a period defined by the predetermined time interval (t i ) and the s−1 future time intervals, in order to display gray shades.