Patent ID: 11860029
Assignee: BOE TECHNOLOGY GROUP CO., LTD.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 5:
6. The light intensity detection circuit of claim 1, wherein the read sub-circuit comprises a first transistor inside a pixel unit and an external read integrated circuit outside the pixel unit, the photoelectric conversion sub-circuit comprises a photodiode, the source follower sub-circuit comprises a second transistor, the reset sub-circuit comprises a third transistor, and the sense sub-circuit comprises a fourth transistor inside the pixel unit and an external sense circuit outside the pixel unit, wherein the external sense circuit comprises a capacitor and a differential amplifier,
wherein a control electrode of the first transistor is connected to a read control terminal, a first electrode of the first transistor is connected to the second node, and a second electrode of the first transistor is connected to the external read integrated circuit;
an anode terminal of the photodiode is connected to a bias voltage terminal, and a cathode terminal of the photodiode is connected to the first node;
a control electrode of the second transistor is connected to the first node, a first electrode of the second transistor is connected to a first voltage terminal, and a second electrode of the second transistor is connected to the second node;
a control electrode of the third transistor is connected to a reset control terminal, a first electrode of the third transistor is connected to the offset voltage terminal, and a second electrode of the third transistor is connected to the first node;
a control electrode of the fourth transistor is connected to a sense control terminal, a first electrode of the fourth transistor is connected to the second node, and a second electrode of the fourth transistor is connected to an end of the capacitor; and
the end of the capacitor is further connected to a negative input terminal of the differential amplifier, and the other end of the capacitor is grounded; a positive input terminal of the differential amplifier is connected to a reference voltage terminal, and an output terminal of the differential amplifier is connected to an sense end.