Pixel circuit, driving method, pixel structure and display panel

Abstract

The embodiments of the invention provide a pixel circuit, a driving method, a pixel structure and a display panel. A driving unit of the pixel circuit comprises an isolation transistor, a driving transistor and a light emitting control transistor which are sequentially connected in series between an external power supply and a light emitting unit through a source and a drain. The gates of the light emitting control transistor and the isolation transistor are jointly connected with a first control signal. The driving transistor and a compensation transistor are common-gate transistors. The driving transistor is used for generating a driving current to drive the light emitting unit to emit light when the first control signal makes the isolation transistor and the light emitting control transistor switched on, wherein the driving current is obtained according to a first voltage, the external power supply and the threshold voltage of the driving transistor in the driving unit. Because of the isolation transistor, the data signal will not be affected by the external power signal in the common-gate area in the data writing stage, and the light emitting stability of light emitting diodesis further improved.

Description

technical field [0001] The invention relates to the technical field of electronic displays, in particular to a pixel circuit, a driving method, a pixel structure and a display panel. Background technique [0002] In an existing pixel circuit, generally a light emitting diode in the pixel circuit is driven to emit light through a thin film transistor, and this thin film transistor is called a driving transistor. The driving transistor works in a saturated state, because in the saturated state, the sensitivity of the driving current output by the driving transistor to the source-drain voltage is lower than that of the driving transistor in the linear state, which can provide a more stable driving current for the light emitting diode. figure 1 For the existing most basic pixel circuit, such as figure 1 As shown, the pixel circuit is composed of two transistors T11 and T12, and a capacitor C11. When the Sn signal controls the transistor T12 to be turned on, the data signal dat...

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Problems solved by technology

[0008] However, with figure 2 As a representative of the existing threshold compensation circuit, in the data writing stage, only the transistor T25 is separated between the power supply ELVDD and the data signal, because the voltage of the power supply ELVDD is far away from other signal voltages, and the existence of the leakage current of T25, the data signal Very susceptible to the influence of the power supply ELVDD, which affects the light-emitting stability of the light-emitting diode

[0009] In summary, there is a problem of unstable light emitting diodes in the prior art

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