Pixel driving circuit with driving current controlled by digital signals for grayscale control, display device and display method

A display method, comprising:

• providing a pixel driving circuit including a first circuit and a second circuit;
• providing, by the first circuit, a driving current to the light emitting element under a control of the second circuit;
• receiving, by the second circuit, a digital selection signal from at least one digital selection signal line and receiving a digital data signal from at least one digital data signal line;
• and
• controlling, by the second circuit, a frequency and duration of the driving current received by the light emitting element during one frame of image, thereby controlling a gray scale of a sub-pixel having the light emitting element, wherein:
• the second circuit includes a latch, a first transistor and a second transistor;
• the latch includes a third transistor, a fourth transistor, a fifth transistor and a sixth transistor;
• gate electrodes of the fourth transistor and the sixth transistor are coupled to a first latch node in the second circuit, and the first latch node is coupled to a second electrode of the first transistor;
• gate electrodes of the third transistor and the fifth transistor are coupled to a second latch node, and the second latch node is coupled to a second electrode of the second transistor;
• second electrodes of the third transistor and the fifth transistor are coupled to the first latch node, and the first latch node is coupled to gate electrodes of the fourth transistor and the sixth transistor;
• second electrodes of the fourth transistor and the sixth transistor are coupled to the second latch node in the second circuit, the second latch node is coupled to the gate electrode of the third transistor and the gate electrode of the fifth transistor;
• first electrodes of the third transistor and the fourth transistor are coupled to a voltage supply signal line and configured to receive a voltage supply signal from the voltage supply signal line;
• first electrodes of the fifth transistor and the sixth transistor are coupled to a low voltage signal line and configured to receive a low voltage signal from the low voltage signal line;
• the second circuit further includes a seventh transistor and an eighth transistor;
• gate electrodes of the seventh transistor and the eighth transistor are coupled to the first latch node;
• second electrodes of the seventh transistor and the eighth transistor are coupled to the gate electrode of the light emitting control transistor in the first circuit;
• a first electrode of the seventh transistor is coupled to the voltage supply signal line;
• and
• a first electrode of the eighth transistor is coupled to the low voltage signal line.