An optical detection method, applied to an optical detection circuit, wherein the optical detection circuit comprises a photosensitive transistor, a resetting unit, an energy storing unit, a detection control unit and a detection unit, wherein:
- a first electrode of the photosensitive transistor is connected to a first node, a second electrode of the photosensitive transistor is connected to a first voltage input terminal, a gate electrode of the photosensitive transistor is connected to a gate control terminal, a threshold voltage of the photosensitive transistor changes as an intensity of an optical signal received by the photosensitive transistor changes, a wavelength of the optical signal is within a preset wavelength range, and the first voltage input terminal is configured to input a first voltage;
- the resetting unit is configured to control, under control of a resetting control terminal, whether the first node is connected to a second voltage input terminal or not, a first terminal of the resetting unit is connected to the first node, a second terminal of the resetting unit is connected to the second voltage input terminal, and the second voltage input terminal is configured to input a second voltage;
- the energy storing unit comprises a first terminal connected to the first node and a second terminal connected to the second voltage input terminal;
- the detection control unit is configured to control, under control of a detection control terminal, whether the first node is connected to the detection unit;
- and
- the detection unit is connected to the first node via the detection control unit and is configured to, in a case that the detection control unit controls the first node to be connected to the detection unit, detect an electric signal from the first node and obtain the intensity of the optical signal based on the electric signal;
- wherein a detection cycle of the optical detection circuit comprises a resetting phase, a sensing phase and a detecting phase, and the optical detection method comprises:
- in the resetting phase, resetting, by the resetting unit under control of the resetting control terminal, a voltage at the first node to turn on the photosensitive transistor and controlling, by the detection control unit under control of the detection control terminal, the first node to be disconnected from the detection unit;
- in the sensing phase, stopping resetting the voltage at the first node by the resetting unit under control of the resetting control terminal, and enabling, by the photosensitive transistor which continues to be turned on, the energy storing unit to charge or discharge until the photosensitive transistor is turned off;
- and
- in the detecting phase, controlling, by the detection control unit under control of the detection control terminal, the first node to be connected to the detection unit, detecting, by the detection unit, an electric signal from the first node, and obtaining, by the detection unit, an intensity of the optical signal based on the electric signal.