Pixel driving circuit

Abstract

The invention discloses a pixel driving circuit which comprises a scanning line S0, a scanning line S1 and a data line. The S0 is connected to a grid of a thin film transistor (TFT) T3 and a grid of a TFT T4, and the S1 is connected to a grid of a TFT T5, a grid of a TFT T2, a grid of a TFT T6 and one end of a capacitor C2. The data line is connected to a source electrode of the T2, a source electrode of the T4 is connected to a reference voltage wire, a drain electrode of the T6 is connected with a voltage drain drain (VDD) wire, the VDD wire is connected with one end of a capacitor C1, and the other end of the C1 is connected to a grid of a TFT T1, the other end of the C2, a source electrode of T5 and a drain electrode of the T4. A source electrode of the T1 is connected to a drain electrode of the T2 and a source electrode of the T6, a drain electrode of the T3 is connected to a drain electrode of the T1 and a drain electrode of the T5, A source electrode of the T3 is connected to an anode of an organic light-emitting diode (OLED), and a cathode of the OLED is connected to a negative voltage VSS. The pixel driving circuit enables brightness of a screen body to be uniform and consistent, and a narrow frame of the screen body can be achieved.

Description

technical field [0001] The present invention relates to a pixel circuit, in particular to an AMOLED pixel drive circuit capable of making the brightness of Active Matrix Organic Light Emitting Diode (AMOLED, Active Matrix Organic Light Emitting Diode) more uniform. Background technique [0002] Organic light-emitting diode (OLED) is an active light-emitting device. Compared with the current mainstream flat-panel display technology thin-film field-effect transistor liquid crystal display (TFT-LCD), OLED has the advantages of high contrast, wide viewing angle, low power consumption and thinner volume. It becomes the next-generation flat-panel display technology after LCD, and is one of the most concerned technologies in flat-panel display technology. [0003] For an active organic light-emitting display (AMOLED), FIG. 1 is a schematic diagram of a pixel circuit in the prior art, and FIG. 2 is a working timing diagram of a pixel circuit in the prior art. The brightness of the ...

AI Technical Summary

Problems solved by technology

[0006] In the LTPS (Low Temperature Poly Silicon) process, a laser crystallization step is required. Due to the limited width of the laser, it is impossible to scan the TFTs of all pixels at one time. Therefore, it is necessary to go through multiple laser crystallization steps. The TFTs of all pixels are scanned once, but the intensity of the laser light cannot be exactly the same each time, so when the laser scans different positions, the received laser energy will be different, which in turn makes the TFTs irradiated at different times have different thresholds Voltage, so that the current driving OLED light emission in each pixel is different, and also causes different brightness, making the brightness between pixels inconsistent, and the consistency of the screen is seriously affected

Therefore, it is very difficult to manufacture a uniformly luminous display panel with this circuit

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