AMOLED pixel drive circuit

Abstract

The invention relates to an AMOLED pixel drive circuit comprising a first thin film transistor (T1), a second thin film transistor (T2), a third thin film transistor (T3), a fourth thin film transistor (T4), a first capacitor (C) and a second capacitor (Cst) and an organic light-emitting diode (D1), wherein a top gate electrode of the first thin film transistor (T1) is connected with a first node (G), a bottom gate electrode of the first thin film transistor (T1) is connected with a second node (B), a source electrode and a drain electrode of the first thin film transistor (T1) are respectively connected with a power source high potential (VDD) and a third node (S), a gate electrode of the second thin film transistor (T2) is connected with a scanning line (Scan), a source electrode and a drain electrode of the second thin film transistor (T2) are respectively connected with the first node (G) and a first data line (Data1), a gate electrode of the third thin film transistor (T3) is connected with the scanning line (Scan), a source electrode and a drain electrode of the third thin film transistor (T3) are respectively connected with a detecting signal line (Sense) and a third node (S), a gate electrode of the fourth thin film transistor (T4) is connected with the scanning line (Scan), a source electrode and a drain electrode of the fourth thin film transistor (T4) are respectively connected with the second node (B) and a second data line (Data2), the first capacitor (C) is connected with the second node (B) and the power source high potential (VDD), the second capacitor (Cst) is connected with the first node (G) and the third node (S), and an anode of the organic light-emitting diode (D1) is connected with the third node (S). The AMOLED pixel drive circuit can be used for effectively compensating TFT driving electric drifting.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an AMOLED pixel driving circuit. Background technique [0002] Organic light-emitting diode (OLED) display devices have self-illumination, low driving voltage, high luminous efficiency, short response time, high definition and contrast, nearly 180° viewing angle, and wide operating temperature range, which can realize flexible display and large-area full-color display And many other advantages, it is recognized by the industry as the display device with the most development potential. According to the driving method, OLED display devices can be classified into two categories: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED). Among them, AMOLED has pixels arranged in an array, belongs to the active display type, has high luminous efficiency, and is usually used as a high-definition large-size display device. [0003] AMOLED i...

AI Technical Summary

Problems solved by technology

Therefore, the importance of the threshold voltage Vth of the driving TFT is very obvious. The positive or negative drift of the threshold voltage will cause different currents to pass through the organic light-emitting diode under the same data signal, affecting the uniformity of the brightness of the entire panel.

However, thin film transistors made of low-temperature polysilicon or oxide semiconductors will experience threshold voltage drift during use due to various factors.

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