Pixel circuit and driving method and application thereof

Abstract

The invention provides a pixel circuit and a driving method thereof. A first capacitor is electrically connected between the positive pole of an organic LED and the grid electrode of a driving transistor. When all pixel circuits respond to the same data signal, the carrier mobilities of the driving transistors of all the pixel circuits are different, so that current flowing through the organic LEDs is not absolutely the same, and the uniformity of the lighting brightness of all pixel units is influenced; and voltage variation is fed back to the grid electrodes of the driving transistors through the first capacitors connected in parallel with the driving transistors, and all the transistors which are field-effect transistors with the same channel polarity can play a role of negative feedback adjustment of current flowing into the positive poles of the organic LEDs, so that current, flowing through the organic LEDs, in all pixels is compensated to be consistent, and accordingly, the problem that the display effect of an organic light-emitting display device applying the organic LEDs is influenced by nonuniformity of the organic LEDs due to difference between the carrier mobilities is effectively solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a pixel circuit capable of effectively improving the response characteristics of a display device and displaying uniform pixel quality, a driving method thereof, and a display device using the pixel circuit. Background technique [0002] Flat panel display has the characteristics of complete planarization, lightness, thinness, and power saving. It is an inevitable trend and research focus of image display development. Among various types of flat panel display devices, since the active matrix organic light emitting display device (English full name is Active Matrix Organic Light Emitting Display, referred to as AMOLED) uses self-luminous organic light emitting diode (English full name is Organic Light Emitting Diode, referred to as OLED). ) to display images, has the characteristics of short response time, driving with low power consumption, and relatively better brightness and c...

AI Technical Summary

Problems solved by technology

[0006] although figure 1 The traditional active matrix organic light emitting display device has the advantage of low power consumption, but due to the manufacturing process of thin film transistors, it is difficult to make all the thin film transistors in the active matrix organic light emitting display device have the same carrier mobility In particular, the carrier mobility of the driving transistors in different pixel units is different, so that when the same gate driving voltage is applied, the current flowing through the organic light-emitting diodes is inconsistent, resulting in inconsistent brightness of the organic light-emitting diodes in different pixel units; When the pixel unit responds to the same data signal, it produces light with different brightness, which seriously affects the display effect of the active matrix organic light-emitting display device.

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