A display device that can compensate for degradation of circuit elements while suppressing an increase in circuit size is implemented. A data signal line (S(j)) is not only used as a signal line that transfers a signal for allowing an organic EL element (OLED) in each pixel circuit (11) to emit light at a desired luminance, but also used as a signal line for characteristic detection. In addition, a switch (334) is provided between the data signal line (S(j)) and an internal data line (Sin(j)). In such a configuration, during an AD conversion period during which analog data obtained for characteristic detection is converted into digital data, the switch (334) is brought into an off state and a potential of the data signal line (S(j)) obtained immediately before the AD conversion period is supplied from through a predetermined control line (CL) to the data signal line (S(j)).

A display panel and a display device are provided. The display panel includes a pixel circuit and a light-emitting element. The pixel circuit includes a data-writing module, a driving module, and a compensation module. The data-writing module is configured to selectively provide a data signal for the driving module. The driving module includes a driving transistor and is configured to provide a driving current to the light-emitting element. The compensation module is configured to compensate a threshold voltage of the driving transistor. A source of the driving transistor includes a first source and a second source, and a drain of the driving transistor includes a first drain and a second drain. A third driving portion is arranged between the first source and the second source. A first driving portion is arranged between the second source and the first drain.

A pixel circuit, a method for driving the same, a display panel and a display device are provided. The pixel circuit includes: a driving sub-circuit, a first light-emission controlling sub-circuit, a second light-emission controlling sub-circuit, an anode potential controlling sub-circuit, all of which operate in cooperation so that the pixel circuit drives a light-emitting element to emit light, where the second light-emission controlling sub-circuit provides voltage output by the driving sub-circuit to an anode of the light-emitting element in a light-emission period, and the anode potential controlling sub-circuit provides a signal of a first voltage signal terminal to the anode of the light-emitting element in a non-light-emission period.

A display device includes: a substrate; a driving voltage line and a data line that are on the substrate; a semiconductor layer that includes a first electrode, a channel, and a second electrode of a driving transistor, the driving transistor being connected to the driving voltage line; a gate electrode of the driving transistor overlapping the channel; a lower storage electrode extending from the gate electrode; and an upper storage electrode overlapping the lower storage electrode, wherein the semiconductor layer further includes a first electrode, a channel, and a second electrode of a switching transistor, the switching electrode being connected between the lower storage electrode and the data line, the upper storage electrode does not overlap the channel of the driving transistor, the lower storage electrode includes a first portion and a second portion that are at opposite sides of the gate electrode.

A driving transistor is configured to control driving current for the light-emitting element. A first capacitive element and a second capacitive element are connected in series between a gate and a source of the driving transistor. A first switching transistor is configured to switch connection/disconnection between a data line and an intermediate node located between the first capacitive element and the second capacitive element. A second switching transistor is configured to switch connection/disconnection between the gate and a drain of the driving transistor. A third switching transistor is configured to switch connection/disconnection between the intermediate node and a reference power line. A fourth switching transistor is configured to switch supply/non-supply of driving current from the driving transistor to the light-emitting element. A fifth switching transistor is configured to switch connection/disconnection between an anode of the light-emitting element and a reset power line.

A driving transistor is configured to control driving current for the light-emitting element. A first capacitive element and a second capacitive element are connected in series between a gate and a source of the driving transistor. A first switching transistor is configured to switch connection/disconnection between a data line and an intermediate node located between the first capacitive element and the second capacitive element. A second switching transistor is configured to switch connection/disconnection between the gate and a drain of the driving transistor. A third switching transistor is configured to switch connection/disconnection between the intermediate node and a reference power line. A fourth switching transistor is configured to switch supply/non-supply of driving current from the driving transistor to the light-emitting element. A fifth switching transistor is configured to switch connection/disconnection between an anode of the light-emitting element and a reset power line.

In the case of reducing an effect of variations in current characteristics of transistors by inputting a signal current to a transistor in a pixel, a potential of a wiring is detected by using a precharge circuit. In the case where there is a difference between a predetermined potential and the potential of the wiring, a charge is supplied to the wiring to perform a precharge by charging rapidly. When the potential of the wiring reaches the predetermined potential, the supply of charge is stopped and a signal current only is supplied. Thus, a precharge is performed only in a period until the potential of the wiring reaches the predetermined potential, therefore, a precharge can be performed for an optimal period.

In the case of reducing an effect of variations in current characteristics of transistors by inputting a signal current to a transistor in a pixel, a potential of a wiring is detected by using a precharge circuit. In the case where there is a difference between a predetermined potential and the potential of the wiring, a charge is supplied to the wiring to perform a precharge by charging rapidly. When the potential of the wiring reaches the predetermined potential, the supply of charge is stopped and a signal current only is supplied. Thus, a precharge is performed only in a period until the potential of the wiring reaches the predetermined potential, therefore, a precharge can be performed for an optimal period.

Pixel compensation circuit, method and flat display device. The circuit includes a control terminal of a first controllable switch connected with a first scanning line, first terminal connected with data line; second terminal connected with control terminal of the driving switch through a storage capacitor, a first terminal of the driving switch connected with a voltage terminal; a control terminal of the second controllable switch connected with a second scanning line, a first terminal connected with the control terminal of the driving switch, the second terminal connected with second terminal of the driving switch; control terminal of the third controllable switch connected with a third scanning line, first terminal connected with the second terminal of the driving switch; anode of an OLED connected with the second terminal of the third controllable switch, cathode is grounded to avoid unstable current of the OLED by drift of threshold voltage of driving transistor.

Pixel compensation circuit, method and flat display device. The circuit includes a control terminal of a first controllable switch connected with a first scanning line, first terminal connected with data line; second terminal connected with control terminal of the driving switch through a storage capacitor, a first terminal of the driving switch connected with a voltage terminal; a control terminal of the second controllable switch connected with a second scanning line, a first terminal connected with the control terminal of the driving switch, the second terminal connected with second terminal of the driving switch; control terminal of the third controllable switch connected with a third scanning line, first terminal connected with the second terminal of the driving switch; anode of an OLED connected with the second terminal of the third controllable switch, cathode is grounded to avoid unstable current of the OLED by drift of threshold voltage of driving transistor.