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Pixel driving circuit, driving method thereof, and display device

A pixel driving circuit and driving power technology, applied in circuits, electrical components, static indicators, etc., can solve problems such as differences in driving current, different successive currents, and affecting user experience, so as to improve uniformity, consistency, and The effect of user experience

Active Publication Date: 2016-03-16
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above formula that if the V between different pixel units th Different, there is a difference in the drive current; if the threshold voltage V of the drive transistor th Drift over time may cause different currents successively, resulting in residual image, reducing the display effect and affecting the user experience

Method used

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  • Pixel driving circuit, driving method thereof, and display device
  • Pixel driving circuit, driving method thereof, and display device
  • Pixel driving circuit, driving method thereof, and display device

Examples

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Embodiment 1

[0040] Such as figure 2 As shown in , a pixel driving circuit provided by the present invention mainly includes an electroluminescent element, a driving transistor DTFT, a switching unit, a charging unit, a compensation unit, an isolation unit and a storage unit; the switching unit is used to control the data of the data line Voltage writing, the first end of which is connected to the data line, and the second end is respectively connected to the charging unit, the compensation unit, the first end of the storage unit and the gate of the driving transistor DTFT; the charging unit is used to control the driving power as the storage capacitor C Charging, its second terminal is respectively connected to the first terminal of the driving power supply and the electroluminescent element; the isolation unit is used to isolate the electrical connection between the electroluminescent element and the source of the driving transistor DTFT, and its first terminal is connected to the electr...

Embodiment 2

[0057] This embodiment provides a display device, including the above-mentioned pixel circuit. Specifically, the display device includes a plurality of pixel unit arrays, and each pixel unit corresponds to any pixel circuit in the above-mentioned embodiments. Since the pixel circuit compensates the drift of the threshold voltage of the driving transistor, the display of the organic light-emitting diode OLED is stable, the uniformity of the display brightness is improved, and the display quality is greatly improved.

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Abstract

The present invention relates to the technical field of organic light-emitting display, in particular to a pixel driving circuit, a driving method thereof, and a display device. The pixel driving circuit includes an electroluminescent element, a driving transistor, a switch unit, a charging unit, a compensation unit, an isolation unit and a storage unit. In the pixel drive circuit provided by the embodiment of the present invention, the storage capacitor is first charged by the charging unit, and then the voltage in the storage capacitor is quickly matched with the driving current by using the method of charging first and then discharging, so as to quickly compensate the threshold voltage Vth, The drive current provided by the drive transistor is not affected by the threshold voltage Vth, which improves the consistency of the drive current, improves the uniformity of display brightness, and improves user experience.

Description

technical field [0001] The present invention relates to the technical field of organic light-emitting display, in particular to a pixel driving circuit, a driving method thereof, and a display device. Background technique [0002] Compared with traditional LCD panels, AMOLED (ActiveMatrix / OrganicLightEmittingDiode, active matrix organic light-emitting diode) display panels have the characteristics of faster response, higher contrast, and wider viewing angles. Therefore, AMOLED has been increasingly popular among display technology developers. focus on. [0003] The active matrix organic light emitting diode display panel can emit light by driving the current generated by the thin film field effect transistor (ThinFilmTransistor, TFT) in the saturation state, because when the same gray scale voltage is input, different threshold voltages will generate different currents , causing inconsistency in the drive current. Low temperature polysilicon technology (LowTemperaturePoly-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/3258
CPCG09G3/3233G09G2300/0819G09G2300/0842G09G2300/0861G09G2310/0262G09G2320/045G09G3/3225G09G2320/043G09G3/3208G09G2320/0233H10K59/1213G09G3/3258G09G2330/00
Inventor 李天马李凡
Owner BOE TECH GRP CO LTD
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