Pixel driving circuit, pixel driving method, array substrate, and display device

A pixel driving method applied to a pixel driving circuit,

• wherein the pixel driving circuit includes a pixel driving unit and an optical detection unit;
• wherein the pixel driving unit is configured to drive a light-emitting element comprised in a pixel unit to emit light;
• the optical detection unit comprises a photoelectric conversion sub-circuit and a switch control sub-circuit;
• the photoelectric conversion sub-circuit is configured to receive light emitted from the light-emitting element, and convert the light into an electrical signal;
• the switch control sub-circuit is configured to control an output of the electrical signal under control of a first scanning signal;
• and
• the pixel driving unit is further configured to adjust brightness of the light emitted from the light-emitting element according to the electrical signal,
• the pixel driving method comprises a display stage and an optical detection stage,
• wherein, in the display stage, the pixel driving unit drives the light-emitting element comprised in the pixel unit to emit light;
• and
• in the optical detection stage, the pixel driving unit continues driving the light-emitting element to emit light, the photoelectric conversion sub-circuit receives the light emitted from the light-emitting element and converts the light into an electrical signal;
• the switch control sub-circuit controls an output of the electrical signal under control of the first scanning signal;
• and the pixel driving unit adjusts brightness of the light emitted from the light-emitting element according to the electrical signal.

An array substrate comprising pixel units arranged in an array, a plurality of first scanning lines, a plurality of second scanning lines, a plurality of data lines and a plurality of compensation lines;

• each of the pixel units comprises a light-emitting element and a pixel driving circuit;
• wherein the pixel driving circuit includes a pixel driving unit and an optical detection unit;
• wherein the pixel driving unit is configured to drive a light-emitting element comprised in a pixel unit to emit light;
• the optical detection unit comprises a photoelectric conversion sub-circuit and a switch control sub-circuit;
• the photoelectric conversion sub-circuit is configured to receive light emitted from the light-emitting element, and convert the light into an electrical signal;
• the switch control sub-circuit is configured to control an output of the electrical signal under control of a first scanning signal;
• and
• the pixel driving unit is further configured to adjust brightness of the light emitted from the light-emitting element according to the electrical signal,
• the light-emitting element is connected to the pixel driving circuit;
• the first scanning lines and the second scanning lines extend along a row direction, and the data lines extend along a column direction;
• the pixel driving circuits in a same row are connected to a first scanning line and a second scanning line for the row respectively;
• the pixel driving circuits in a same column are connected to a data line for the column;
• each pixel driving circuit is connected to one compensation line;
• the first scanning line for the row is configured to output a first scanning signal, the second scanning line for the row is configured to output a second scanning signal, the data line for the column is configured to output a data voltage signal, the compensation line is configured to receive an electrical signal outputted from a photoelectric conversion sub-circuit in the pixel driving circuit.