The present application claims priority of Chinese Patent Application filed with China Patent Office on Jun. 5, 2019, with the application number 201910487416.3 and entitled “Imaging backplane, driving method thereof and fingerprint identification panel”, the contents of which are incorporated herein by reference in their entirety.

TECHNICAL FIELD

The present disclosure relates to, but is not limited to, the technical field of imaging, in particular to an imaging backplane, a driving method thereof and a fingerprint identification panel.

BACKGROUND

Fingerprint identification refers to that an identity distinguishing is performed by comparing detailed feature points of different fingerprints. Because everyone has different fingerprints, even for ten fingers of a same person, their fingerprints are also different, so fingerprints can be used for identity authentication.

Point light source imaging is an implementation of fingerprint identification. The point light source imaging is mainly implemented by two point light sources and a photoelectric sensor, its working principle is as follows: two point light sources are turned on in a time-sharing manner, light of each point light source is directed to the finger, and the photoelectric sensor receives the light reflected by the finger to identify the fingerprint.

SUMMARY

The following is a summary of the subject matter described in detail in the present disclosure. This summary is not intended to limit the protection scope of the claims.

In a first aspect, the present disclosure provides an imaging backplane including M rows and N columns of imaging structures, 2M rows of first signal lines, 2N columns of second signal lines, a first reset sub-circuit and a second reset sub-circuit;

wherein each imaging structure includes a first imaging unit and a second imaging unit; the first imaging unit of the imaging structure of row i and column j is connected with the first signal line of row2i-1and the second signal line of column2j-1respectively, and the second imaging unit of the imaging structure of row i and column j is connected with the first signal line of row2iand the second signal line of column2jrespectively, where 1≤i≤M and 1≤j≤N;

the first reset sub-circuit is respectively connected with a first reset terminal, a low-level power supply terminal and the second signal lines of all odd-numbered columns, and is configured to provide a signal of the low-level power supply terminal to the second signal lines of all the odd-numbered columns under control of the first reset terminal, so as to reset the first imaging units; and

the second reset sub-circuit is respectively connected with a second reset terminal, the low-level power supply terminal and the second signal lines of all even-numbered columns, and is configured to provide the signal of the low-level power supply terminal to the second signal lines of all the even-numbered columns under control of the second reset terminal, so as to reset the second imaging units.

In some possible implementations, for the imaging structure of row i and column j, the first imaging unit includes P first imaging subunits, and the second signal lines of column2j-1include P columns of first sub-signal lines, and the P columns of first sub-signal lines correspond to the P first imaging subunits in a one-by-one manner;

each first imaging subunit comprises a photoelectric sensor and a first switching element;

the first switching element is respectively connected with the first signal line of row2i-1, the first sub-signal line corresponding to the first imaging subunit and the photoelectric sensor, where P≥1.

In some possible implementations, for the imaging structure of row i and column j, the second imaging unit includes Q second imaging subunits, and the second signal lines of column2jinclude Q columns of second sub-signal lines, and the Q columns of second sub-signal lines correspond to the Q second imaging subunits in a one-by-one manner;

each second imaging subunit includes a photoelectric sensor and a second switching element; and

the second switching element is respectively connected with the first signal line of row2i, the second sub-signal line corresponding to the second imaging subunit and the photoelectric sensor, where Q≥1.

In some possible implementations, the second signal line is multiplexed as a signal reading line, which is configured to read an electrical signal which is obtained by the photoelectric sensor according to received light.

In some possible implementations, for the imaging structures of row i and column j, the first switching element is a first transistor;

a control electrode of the first transistor is connected with the first signal line of row2i-1, a first electrode of the first transistor is connected with a first sub-signal line corresponding to a first imaging subunit where the first switching element is located, and a second electrode of the first transistor is connected with the photoelectric sensor.

In some possible implementations, for the imaging structure of row i and column j, the second switching element is a second transistor;

a control electrode of the second transistor is connected with the first signal line of row2i, a first electrode of the second transistor is connected with a second sub-signal line corresponding to a second imaging subunit where the second switching element is located, and a second electrode of the second transistor is connected with the photoelectric sensor.

In some possible implementations, the first reset sub-circuit comprises N third transistors;

a control electrode of each third transistor is connected with the first reset terminal, a first electrode of each third transistor is connected with the low-level power supply terminal, and a second electrode of the jththird transistor is connected with the second signal line of column2j-1.

In some possible implementations, the second reset sub-circuit comprises N fourth transistors;

a control electrode of each fourth transistor is connected with the second reset terminal, a first electrode of each fourth transistor is connected with the low-level power supply terminal, and a second electrode of the jthfourth transistor is connected with the second signal line of column2j.

In a second aspect, the present disclosure further provides a fingerprint identification panel including the above imaging backplane.

In a third aspect, the present disclosure further provides a driving method of an imaging backplane, which is applied to the above imaging backplane, including:

a first reset sub-circuit provides a signal of a low-level power supply terminal to second signal lines of all odd-numbered columns under control of a first reset terminal, so as to reset first imaging units; and

a second reset sub-circuit provides the signal of the low-level power supply terminal to second signal lines of all even-numbered columns under control of a second reset terminal, so as to reset second imaging units.

Other aspects will become apparent upon reading and understanding accompanying drawings and the detailed description.

