Measurement method for a device, matrix device, and method for driving matrix device
Provided is a method for measuring a current that a component of a matrix device can supply. A device including components (pixels) arranged in a matrix, first wirings, and second wirings and third wirings which cross the first wirings is used. Each component includes a potential supply circuit, a transistor, and a capacitor. The device is designed as follows: at a point in time, one electrode of the capacitor has a potential equal to that of a gate of the transistor, the other electrode of the capacitor has a potential equal to that of the second wiring, one of a source and a drain of the transistor has a potential equal to that of the first wiring, and the other of the source and the drain of the transistor has a potential equal to that of the third wiring; and the potential of the second wiring and the potential of the third wiring in the case where each component supplies the first wiring with a current in a given direction are different from the potential of the second wiring and the potential of the third wiring in the case where each component supplies the first wiring with a current in the opposite direction.
1. A measurement method for a device comprising:
N components;
a first wiring; and
second wirings which cross the first wiring,
wherein N is an integer of two or more,
wherein each component is configured to supply the first wiring with a current whose direction is configured to be changed,
wherein each component comprises a potential supply circuit, a transistor, and a capacitor,
wherein the device is designed so that, at a point in time, one of a source and a drain of the transistor has a potential equal to that of the first wiring and the other of the source and the drain of the transistor has a potential equal to that of a third wiring, and
wherein the device is designed so that a potential of the second wiring in the case where each component supplies the first wiring with a current in a first direction is different from a potential of the second wiring in the case where each component supplies the first wiring with a current in a second direction opposite to the first direction,
wherein the method comprises:
a process in which the current directions of the N components are individually set and a current flowing through the first wiring is measured N times; and
a process in which a magnitude of a current flowing through each electrical element in the N components is calculated on a basis of currents I[ 1 ] to I[N] obtained by the N measurements and combinations of the current directions of the components in the N measurements, whereby a magnitude of the current supplied from the component to the first wiring is determined,
wherein:
the N measurements differ from each other in combination of the current directions of the N components, and
the magnitude of the current flowing through each electrical element is calculated using a polynomial of the currents I[ 1 ] to I[N].
2. The measurement method according to claim 1 , wherein the device further comprises N third wirings,
wherein the device is designed so that each third wiring has a potential equal to that of an electrode of the capacitor of the corresponding component, and
wherein the device is designed so that a potential of the third wiring in the case where each component supplies the first wiring with the current in the first direction is different from a potential of the third wiring in the case where each component supplies the first wiring with the current in the second direction.
3. The measurement method according to claim 1 , wherein the device is designed so that a potential of a gate of the transistor of each component in the case where each component supplies the first wiring with the current in the first direction is different from that in the case where each component supplies the first wiring with the current in the second direction.
4. A matrix device configured to execute the measurement method according to claim 1 .
5. The matrix device according to claim 4 , wherein the matrix device is a display device or a photodetector device.
6. A method for driving a matrix device, wherein input or output data is corrected on the basis of current values of components measured by the measurement method according to claim 1 .
7. A measurement method for a device comprising:
components arranged in a matrix with N rows and M columns (N and M are each an integer of two or more);
M first wirings; and
N second wirings which cross the first wirings,
wherein each component is configured to supply one of the M first wirings with a current whose direction is configured to be changed,
wherein each component comprises a potential supply circuit, a transistor, and a capacitor,
wherein the device is designed so that, at a point in time, one of a source and a drain of the transistor of each component has a potential equal to that of the first wiring and the other of the source and the drain of the transistor has a potential equal to that of the second wiring, and
wherein the device is designed so that a potential of the second wiring in the case where each component supplies the first wiring with a current in a first direction is different from a potential of the second wiring in the case where each component supplies the first wiring with a current in a second direction opposite to the first direction,
wherein the method comprises:
a process in which the potentials of the N second wirings are individually set and currents flowing through the M first wirings are each measured N times, and
a process in which a magnitude of a current flowing through each electrical element in an m-th column (m is an integer of 1 or more and M or less) is calculated on a basis of currents I[ 1 ,m] to I[N,m] of the first wiring in the m-th column, which are obtained by the N measurements, and combinations of the potentials of the N second wirings in the N measurements, whereby a magnitude of the current supplied from each component to the corresponding first wiring is determined,
wherein:
the N measurements differ from each other in combination of the potentials of the N second wirings, and
the magnitude of the current flowing through each electrical element in the m-th column is calculated using a polynomial of the currents I[ 1 ,m] to I[N,m].
8. The measurement method according to claim 7 , wherein:
the polynomial of the currents I[ 1 ,m] to I[N,m] is expressed as a product of an inverse matrix of a square matrix A with N rows and a matrix with N rows and M columns whose elements are the currents I[ 1 ,m] to I[N,m], and
no element of the inverse matrix of the square matrix A with N rows is 0.
9. The measurement method according to claim 8 , wherein all the elements of the inverse matrix of the square matrix A with N rows have the same magnitude.
10. The measurement method according to claim 8 , wherein the square matrix A with N rows is a Hadamard matrix.
11. The measurement method according to claim 8 , wherein the square matrix A with N rows is a circulant matrix.
12. The measurement method according to claim 8 , wherein:
N is a multiple of 4, and
the sum of elements of a given row of the square matrix A with N rows is 2 or 2.