Linear system coefficient estimating method, integrated circuit, and electronic device

摘要

A touch panel controller (3) capable of accurately detecting a change in capacitance includes: a driving section (4) which drives capacitors (C1 through CM) in parallel in accordance with N M-dimensional vectors; and an estimating section (5) which obtains linear sums of the capacitors (C1 through CM) in accordance with the driving in parallel and estimates values of the capacitors (C1 through CM) based on an inner product operation carried out with respect to (i) the linear sums of the capacitors (C1 through CM) and (ii) the N M-dimensional vectors, the driving section (4) driving the capacitors (C1 through CM) in parallel in a first order of the N M-dimensional vectors, the estimating section (5) estimating a first estimated value of the capacitors (C1 through CM) in accordance with the driving in parallel in the first order, the driving section (4) driving the capacitors (C1 through CM) in parallel in a second order of the N M-dimensional vectors, the estimating section (5) estimating a second estimated value of the capacitors (C1 through CM) in accordance with the driving in parallel in the second order, and the touch panel controller (3) further including an averaging section (17) estimating the values of the capacitors (C1 through CM) by averaging the first estimated value and the second estimated value.

主权项

1. A capacitance estimating method in which N linear sums of M capacitors provided at intersections of sense lines and M drive lines are obtained by driving the M capacitors in parallel in accordance with voltages which constitute N M-dimensional vectors and values of the M capacitors are estimated based on an inner product operation carried out with respect to (i) the N linear sums of the M capacitors and (ii) M N-dimensional vectors,
the M N-dimensional vectors being vectors which make it possible to obtain, as a result of an inner product operation carried out with respect to the M N-dimensional vectors and the N M-dimensional vectors, a matrix which is a square matrix with M rows and M columns and in which an absolute value of a diagonal element is relatively larger than an absolute value of a non-diagonal element, said capacitance estimating method comprising: a first estimating step of estimating a first estimated value of the M capacitors by driving the M capacitors in parallel in accordance with a first matrix in which the N M-dimensional vectors are arranged in a first order; a second estimating step of estimating a second estimated value of the M capacitors by driving the M capacitors in parallel in accordance with a second matrix in which the N M-dimensional vectors are arranged in a second order that is different from the first order; and an averaging step of estimating the values of the M capacitors by averaging the first estimated value and the second estimated value.