Patent ID: 9235280
Filing Date: 2016-01-12
CPC Classification: G06F

Claim Text:
1. A touch screen controller for a mutual capacitance touch screen panel having a plurality of row conductors intersecting with a plurality of column conductors to form a matrix of pixels, each pixel configured to have a mutual capacitance, the touch screen controller comprising: a transmitting unit configured to drive the row conductors with row drive signals formed from an excitation matrix, wherein each row in the excitation matrix is orthogonal to every other row in the excitation matrix, wherein the excitation matrix includes a cyclic extension at the end of each row, the cyclic extension for each row repeating a sequence of elements taken in order from a beginning portion of the row, and wherein the excitation matrix has a dimension larger than the matrix of pixels and is a modified Hadamard matrix that is a dot product of a Hadamard matrix with a cover code matrix, the cover code matrix determined by comparing absolute values of columns summed over non-zero rows of the matrix of pixels; and a receiving unit configured to sense signals from the column conductors and to determine the mutual capacitance of the pixels using the sensed signals and an inverse of the excitation matrix.