Display assembly, display apparatus, and fingerprint recognition method

A display apparatus, comprising a display assembly, wherein the display assembly comprises a display panel and a fingerprint recognition module located on a light-emitting surface of the display panel, and wherein:

• the fingerprint recognition module comprises a plurality of fingerprint recognition units, and each fingerprint recognition unit comprises at least one phototransistor and one switch transistor;
• the phototransistor comprises a first active layer, a first gate, a first source, and a first drain, a material for making the first active layer comprises an organic semiconductor material, and, in a direction perpendicular to the display assembly, the first drain and the first gate partially overlap to form a first capacitor;
• the switch transistor comprises a second active layer, a second gate, a second source, and a second drain;
• and
• the fingerprint recognition module comprises a first metal layer, wherein the first source, the first drain, the second source, and the second drain are all located at the first metal layer, and the first drain is connected to the second source.

A fingerprint recognition method for a display assembly, wherein the display assembly comprises a display panel and a fingerprint recognition module located on a light-emitting surface of the display panel, and wherein:

• the fingerprint recognition module comprises a plurality of fingerprint recognition units, and each fingerprint recognition unit comprises at least one phototransistor and one switch transistor;
• the phototransistor comprises a first active layer, a first gate, a first source, and a first drain, a material for making the first active layer comprises an organic semiconductor material, and, in a direction perpendicular to the display assembly, the first drain and the first gate partially overlap to form a first capacitor;
• the switch transistor comprises a second active layer, a second gate, a second source, and a second drain;
• and
• the fingerprint recognition module comprises a first metal layer, wherein the first source, the first drain, the second source, and the second drain are all located at the first metal layer, and the first drain is connected to the second source;
• and
• wherein the fingerprint recognition method comprises:
• controlling both the switch transistor and the phototransistor to be turned off, and charging the first capacitor to accumulate an amount of initial charge under an action of a leakage current of the phototransistor;
• controlling the switch transistor to be turned on, discharging the first capacitor, and controlling the switch transistor to be turned off after reading the amount of initial charge through the second drain;
• after the phototransistor receives light reflected by a finger, increasing the leakage current, and charging the first capacitor to accumulate an amount of fingerprint charge;
• and
• controlling the switch transistor to be turned on, discharging the first capacitor, and reading the amount of fingerprint charge through the second drain.