TECHNICAL FIELD

The present disclosure relates to a pixel circuit, a display device, a driving method of the pixel circuit, and an electronic apparatus.

BACKGROUND ART

In recent years, in the field of display devices, a flat (flat-panel) display device in which pixels including light-emitting units are arranged in rows and columns (a matrix) has become the mainstream. One example of the flat display devices is an organic electroluminescence (EL) display device using a so-called current-driven electro-optical element such as an organic EL element whose emission luminance changes according to the value of a current flowing through a light-emitting unit.

In a flat display device a typical example of which is this organic EL display device, transistor characteristics (for example, a threshold voltage) of a drive transistor that drives an electro-optical element varies from pixel to pixel due to process variations or the like in some cases. For example, Patent Document 1 discloses a technology of a display device capable of shortening a writing time of an initialization voltage to a gate node of a drive transistor in performing correction operation of characteristics of the drive transistor.

CITATION LIST

Patent Document

Patent Document 1: Japanese Patent Application Laid-Open No. 2015-034861

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

In such an organic EL display device, a driving method in which output of a video signal is stopped at the time of displaying a still image to reduce power consumption is becoming common. When output of a video signal is stopped at the time of displaying a still image, a constant current needs to be continuously supplied to an organic EL element in a pixel circuit, and the luminance changes if the operating point of a drive transistor changes. MOS, low-temperature polycrystalline silicon (LTPS), and the like have relatively large leakage currents. If the number of transistors is increased to maintain the operating point of the drive transistor, pixel layout at a narrow pitch becomes difficult, which hinders high definition of the display.

Thus, in the present disclosure, a new and improved pixel circuit, display device, driving method of the pixel circuit, and electronic apparatus are proposed which can suppress a decrease in luminance due to leakage in a transistor without increasing the number of elements or with a minimum increase in the number of elements even if the number is increased.

Solutions to Problems

According to the present disclosure, there is provided a pixel circuit including a light-emitting element, a drive transistor configured to supply a current to the light-emitting element, a first reset transistor configured to set a potential of an anode of the light-emitting element to a predetermined potential, a first write transistor configured to control writing of a signal voltage at a gate node of the drive transistor, a holding capacitance having one end connected to the gate node of the drive transistor and configured to hold a threshold voltage of the drive transistor, and a second write transistor connected in series between the gate node of the drive transistor and the first write transistor.

Furthermore, according to the present disclosure, there is provided a driving method of a pixel circuit including a light-emitting element, a drive transistor configured to supply a current to the light-emitting element, the first reset transistor configured to set a potential of an anode of the light-emitting element to a predetermined potential, a first write transistor configured to control writing of a signal voltage at a gate node of the drive transistor, a holding capacitance having one end connected to the gate node of the drive transistor and configured to hold a threshold voltage of the drive transistor, and a second write transistor connected in series between the gate node of the drive transistor and the first write transistor, the method including turning on the first write transistor and the second write transistor in a first period after light emission ends, correcting the threshold voltage of the drive transistor in a second period after the first period, writing a signal voltage to the drive transistor in a third period after the second period, and turning off the first write transistor and the second write transistor and allowing a current to flow through the light-emitting element through the drive transistor to cause the light-emitting element to emit light in a fourth period after the third period.

Effects of the Invention

As described above, according to the present disclosure, it is possible to provide a new and improved pixel circuit, display device, driving method of the pixel circuit, and electronic apparatus which can suppress a decrease in luminance due to leakage in a transistor without increasing the number of elements or with a minimum increase in the number of elements even if the number is increased.

Note that the effects described above are not necessarily limited, and along with or in lieu of the effects described above, any of the effects described in the present Description, or another effect that can be grasped from the present Description may be exhibited.

