OELD pixel circuit, display device and control method

A pixel circuit and voltage value technology, applied to static indicators, instruments, etc., can solve the problems of restricted and inflexible data signal design, and achieve the effects of improving flexibility, ensuring normal operation, and ensuring conduction

Active Publication Date: 2015-06-10
BOE TECH GRP CO LTD
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Problems solved by technology

[0007] However, the driving circuit in the prior art has the disadvantage that th

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  • OELD pixel circuit, display device and control method
  • OELD pixel circuit, display device and control method
  • OELD pixel circuit, display device and control method

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[0056] The purpose of the embodiments of the present invention is to provide an OELD pixel circuit and a display device, in which a separately designed charging signal whose voltage value is greater than the actual voltage value of the data signal is used to charge the capacitor, instead of the existing power supply used as the charging signal. signal, avoids the design restriction of the power signal on the data signal, improves the flexibility of designing the OLED pixel circuit, and at the same time improves the reliability of the threshold voltage compensation.

[0057] In the process of implementing the embodiments of the present invention, the inventor found through creative work that the driving circuit of the OLED pixel in the prior art has mutual constraints between the power supply signal and the data signal, which leads to the limitation in designing the driving circuit of the OLED pixel. There are many problems, and the threshold voltage compensation is unreliable, ...

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Abstract

The invention discloses an OELD pixel circuit, a display device and a control method. The OELD pixel circuit comprises an organic light emitting diode, a driving transistor, a first switch unit, a second switch unit and a compensation unit for a capacitor structure, and wherein a drain electrode is connected with the organic light emitting diode; the first switch unit is used for outputting a power source signal to a source electrode of the driving transistor in a light emitting stage; the second switch unit is used for outputting a data signal to a grid electrode of the driving transistor in a current scanning stage; the OELD pixel circuit further comprises a charging control unit, the charging control unit is used for outputting a charging signal to the capacitor structure in a charging stage, charging for the capacitor structure and enabling the capacitor structure to maintain a grid voltage of the driving transistor in the light emitting stage, and the voltage value of the charging signal is larger than the actual voltage value of the data signal. The OELD pixel circuit, the display device and the control method improve design flexibility of a driving circuit, and the normal conduct of threshold voltage compensation is guaranteed.

Description

technical field [0001] The invention relates to display technology, in particular to an OELD pixel circuit, a display device and a control method. Background technique [0002] As far as display devices are concerned, organic light-emitting diodes (Organic Light-Emitting Diode, OLED) have the advantages of self-illumination, high contrast, wide color gamut, etc., and also have the advantages of simple preparation process, low power consumption, and easy realization of flexible display. , becoming an important light-emitting element in emerging flat panel display devices. [0003] In the pixel structure of the OLED display panel, each sub-pixel includes a driving transistor. In the OLED pixel circuit, the current flowing through the OLED is not only controlled by the data signal Vdata, but also affected by the threshold voltage Vth of the driving transistor. [0004] Due to differences in the threshold voltage and mobility of TFTs in multiple pixel circuits, it is impossibl...

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Application Information

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IPC IPC(8): G09G3/32G09G3/3208
CPCG09G2300/0819G09G2320/045G09G3/3233G09G2300/0842G09G2320/0233G09G3/3266
Inventor 孙亮
Owner BOE TECH GRP CO LTD
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