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Active matrix organic light emitting diode (AMOLED) pixel unit, driving method and display device

A technology of pixel unit and driving transistor

Active Publication Date: 2015-03-25
BOE TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The technical problems to be solved by the present invention include, aiming at the non-uniformity of the threshold voltage of the thin film transistor between different pixel units of the existing pixel unit driving circuit and the non-uniformity of the organic light-emitting diode, the circuit is unstable and the organic The problem of the uniformity of the picture of the light-emitting display and the poor quality of light emission provide an AMOLED that can effectively compensate the non-uniformity of the threshold voltage of the thin film transistor and the non-uniformity of the organic light-emitting diode, so that the picture uniformity of the organic light-emitting display is improved. Pixel unit, driving method thereof, and display device

Method used

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  • Active matrix organic light emitting diode (AMOLED) pixel unit, driving method and display device
  • Active matrix organic light emitting diode (AMOLED) pixel unit, driving method and display device
  • Active matrix organic light emitting diode (AMOLED) pixel unit, driving method and display device

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Embodiment 1

[0037] An embodiment of the present invention provides an AMOLED pixel unit, including: a compensation unit, a light emission control unit, a driving transistor T4, a storage capacitor C, and an organic light-emitting diode OLED. The data line DATA signal is transmitted to the gate and source of the driving transistor T4, and at the same time, the reference power signal VREF is transmitted to the first end of the storage capacitor C; the light emission control unit is used to conduct under the control of the light emission control line EM signal, The first power supply signal is transmitted to the source of the driving transistor T4, and at the same time, the first end of the storage capacitor C is connected to the gate of the driving transistor T4 to drive the organic light emitting diode OLED to emit light; the anode of the organic light emitting diode OLED is connected to the storage The cathode of the second terminal of the capacitor C is connected to the second power suppl...

Embodiment 2

[0044] This embodiment provides a method for driving an AMOLED pixel unit, including the following two steps:

[0045] Compensation stage: the scanning line Scan signal is selected, the compensation unit is turned on, the data line DATA signal is transmitted to the gate and source of the drive transistor T4, and the reference power signal VREF is transmitted to the first end of the storage capacitor C;

[0046] Light-emitting stage: the EM signal of the light-emitting control line is gated, the Scan signal of the scanning line is cut off, the light-emitting control unit is turned on, the first power supply signal ELVDD is transmitted to the source of the driving transistor T4, and the first end of the storage capacitor C is connected to the driving transistor T4 The gate of T4 is turned on to drive the organic light emitting diode OLED to emit light.

[0047] Wherein, the compensation unit includes: a first switch transistor T1, a third switch transistor T3, and a fifth switch...

Embodiment 3

[0056] This embodiment provides a display device, including the AMOLED pixel unit described in Embodiment 1, which will not be described in detail here.

[0057] Of course, the display device in this embodiment can be any product or component with a display function such as an OLED panel, a mobile phone, a tablet computer, a television set, a monitor, a notebook computer, a digital photo frame, a navigator, and the like.

[0058] Of course, the display device in this embodiment also has structures such as an outer frame of a conventional AMOLED display device.

[0059] Since the display device of this embodiment has the AMOLED pixel unit in Embodiment 1, its image uniformity is obviously improved.

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Abstract

The embodiments of the present invention provide an AMOLED pixel unit and a drive method therefor, and a display device. The AMOLED pixel unit comprises: a compensation unit, a light-emitting control unit, a driving transistor, a storage capacitor and an organic light-emitting diode, wherein the compensation unit is used for transmitting a data line signal to the gate electrode and a first electrode of the driving transistor in the case of being powered on under a scanning line signal, and transmitting a reference power supply signal to a first end of the storage capacitor at the same time; the light-emitting control unit is used for transmitting a first power supply signal to the first electrode of the driving transistor in the case of being powered on under a light-emitting control line signal, and powering on the first end of the storage capacitor and the gate electrode of the driving transistor at the same time so as to drive the organic light-emitting diode to emit lights; and the anode of the organic light-emitting diode is connected to a second end of the storage capacitor, and the cathode thereof is connected to a second power supply signal. The circuit can effectively compensate the threshold voltage drift and non-uniformity of the transistor and the voltage non-uniformity of the organic light-emitting diode.

Description

technical field [0001] The invention belongs to the display field, and in particular relates to an AMOLED pixel unit, a driving method thereof, and a display device. Background technique [0002] Organic light-emitting display diodes (OLEDs), as a current-mode light-emitting device, have been increasingly used in high-performance displays. Traditional passive matrix organic light-emitting display (Passive Matrix OLED) requires a shorter driving time of a single pixel as the display size increases, so it needs to increase the transient current and increase power consumption. At the same time, the application of high current will cause the voltage drop on the ITO line to be too large, and the working voltage of the OLED will be too high, thereby reducing its efficiency. The active matrix organic light-emitting display (Active Matrix OLED) can solve these problems well by inputting OLED current through the progressive scanning of switching tubes. [0003] In AMOLED backplane ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32
CPCG09G3/32G09G3/3233G09G2300/0842G09G2310/0262G09G2320/045G09G2300/0814G09G2300/0819G09G2320/0233G09G3/3225G09G2320/0204G09G2320/0257
Inventor 盖翠丽宋丹娜吴仲远
Owner BOE TECH GRP CO LTD
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