AMOLED (active matrix/organic light emitting diode) drive circuit, display panel and display

Abstract

The invention discloses an AMOLED (active matrix / organic light emitting diode) drive circuit, a display panel and a display. The AMOLED drive circuit comprises a capacitor, a first thin film transistor, a second thin film transistor, a first OLED (organic light emitting diode) and a second OLED, wherein the first thin film transistor comprises a first grid, a first source and a first drain, the first grid is connected with a scanning signal line, the first source is connected with a signal line, and the first drain is connected with the capacitor; the second thin film transistor comprises a second grid, a second source and a second drain, the second grid is connected with the first drain, the second source is connected with a first level, and the second drain is connected with a second level; the first OLED and the second OLED are located between the sources of the first thin film transistor and the second thin film transistor and arranged in parallel, the polarities of the first OLED and the second OLED are opposite, the size relation between the first level and the second level is alternatively varied in adjacent two frame times, and the first OLED and the second OLED are alternatively conducted in adjacent two frame times. According to the invention, two OLEDs which are opposite in polarity are arranged in the AMOLED drive circuit, and the two OLEDs alternatively emit light, so that the thin film transistors are driven to work in an alternating-current mode, and then driven to be subjected to Vth drift caused by direct-current bias.

Description

technical field [0001] The invention relates to the technical field of liquid crystal display, in particular to an AMOLED driving circuit, a display panel and a display. Background technique [0002] As a new generation display technology, AMOLED (Active-matrix organic light emitting diode, active matrix organic light emitting diode or active matrix organic light emitting diode) has low power consumption, high color gamut, high brightness, high resolution, wide viewing angle, high response Speed ​​and other advantages, so it is favored by the market. [0003] In TFTLCD, the brightness is controlled by voltage, as long as the accuracy of the pixel voltage is controlled to a few millivolts, the non-uniformity can be limited within the required range of about ±1%. This is easy to achieve, because in TFTLCD, the pixel TFT does not need to transform the transmitted signal voltage, but is only used as a switch to transmit the signal voltage directly from the data line to the pixe...

AI Technical Summary

Problems solved by technology

The actual AMOLED pixel development process proves that this is a difficult task. The threshold voltage and channel mobility of LTPSTFTs for AMOLED are not uniform enough in space. The threshold voltage and channel mobility of a-SiTFTs for AMOLED Mobility shifts over time, and these drawbacks contribute to non-uniformity and instability in display brightness

For this reason, it is necessary to introduce various pixel compensation circuits to make the uniformity and stability of the luminous brightness of the display screen meet the requirements of the product, which makes the AMOLED drive circuit more complicated and increases the process cost.

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