Abstract: A display device able to hold a drain potential of an output transistor functioning as a constant current source constant even in a sampling period of another circuit, able to suppress a change due to leakage of a gate potential of the output transistor, able to obtain a uniform current source free from variation in current value of an output stage, and able to display a high quality image without occurrence of uneven luminance toward a scanning end part, wherein for example a current sample and hold circuit finishing a sampling and holding operation during a period where the sampling and holding operation of its own stage is ended and another stage is performing a sampling and holding operation is configured so as to carry a constant current corresponding to a sampled current by a thin film transistor through a node by operating a leakage elimination circuit.

Abstract: In an embodiment of the present invention, for an active-matrix organic EL display in which pixel circuits each including five transistors and one capacitor are two-dimensionally arranged in rows and columns, the timing of transition of a drive signal DS from the “H” level to the “L” level is brought close to the timing of transition of a write signal WS from the “L” level to the “H” level. Furthermore, the active period of a first auto-zero signal AZ1 is overlapped with the active period of the write signal WS. This timing relationship achieves suppression of variation in the source voltage and gate voltage of a drive transistor due to leakage currents, in addition to realization of a function to compensate variation in the characteristic of an organic EL element and a function to compensate variation in the threshold voltage Vth of the drive transistor with a small number of components. Thus, a uniform image quality free from image unevenness can be achieved.

Abstract: A display device able to hold a drain potential of an output transistor functioning as a constant current source constant even in a sampling period of another circuit, able to suppress a change due to leakage of a gate potential of the output transistor, able to obtain a uniform current source free from variation in current value of an output stage, and able to display a high quality image without occurrence of uneven luminance toward a scanning end part, wherein for example a current sample and hold circuit finishing a sampling and holding operation during a period where the sampling and holding operation of its own stage is ended and another stage is performing a sampling and holding operation is configured so as to carry a constant current corresponding to a sampled current by a thin film transistor through a node by operating a leakage elimination circuit.