Pixel circuit, display panel and compensation method for reference voltage of pixel circuit

Abstract

The invention provides a pixel circuit, a display panel and a compensation method for reference voltage of the pixel circuit. The pixel circuit comprises a plurality of pixel internal driving circuitswhich are arranged in an array mode. Each pixel internal driving circuit comprises a first thin film transistor (T1), a second thin film transistor (T2), a fourth thin film transistor (T4), a first capacitor (C1), an organic light emitting diode (D1) and a compensation module. A compensation module is arranged. A scanning signal (EM) is accessed into the compensation module; one end of the compensation module is connected with a first node (G); and the other end thereof is connected with a power supply voltage (VDD) so as to compensate the potential drop of the first node (G) caused by the coupling of the first capacitor (C1), so that the reference voltage Vgs is kept unchanged, the current flowing through the driving thin film transistor (namely the first thin film transistor) is not changed, and the panel emits light uniformly.

Description

Technical field [0001] The present invention relates to the field of display technology, in particular to a pixel circuit, a display panel and a method for compensating the reference voltage of the pixel circuit. Background technique [0002] Organic light emitting diode (OLED) is a self-luminous display technology that has the advantages of wide viewing angle, high contrast, low power consumption, and bright colors. Due to these advantages, the proportion in the display industry is increasing year by year. Oxide thin film transistors are widely used in large-size AMOLEDs due to the advantages of high mobility and good uniformity. However, as the use time of the panel is prolonged, the electrical properties of the thin film transistor and OLED will drift, and eventually become invalid due to problems such as uneven display. [0003] Such as figure 1 As shown, the pixel circuit of the traditional active matrix organic light emitting diode (AMOLED) is 3T1C. When the Data signal is ...

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Problems solved by technology

However, as the panel is used for a longer period of time, the electrical properties of thin film transistors and OLEDs will drift, and eventually fail due to problems such as uneven display.

[0003] like figure 1 As shown, the pixel circuit of the traditional active matrix organic light emitting diode (AMOLED) is 3T1C. When the Data signal is written to the node G point stage, when the gate of T2 is closed, due to the coupling of the capacitor C1 The effect causes the voltage at point G to drop, causing the current flowing through T1 to change (such as figure 2 In the mark 10, there is a fluctuation in the current curve climb), and the coupling effect of different positions of the panel is different, resulting in uneven light emission of the panel

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