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Organic electroluminescence display panel and display device

An electroluminescence display and display panel technology, which is applied in the direction of circuits, electrical components, and electric solid-state devices, can solve problems such as OLED brightness attenuation, and achieve the effects of avoiding potential rise, improving screen flicker, and reducing attenuation

Active Publication Date: 2019-12-24
XIAMEN TIANMA MICRO ELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Embodiments of the present invention provide an organic electroluminescent display panel and a display device to solve the problem of OLED brightness attenuation in the prior art

Method used

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  • Organic electroluminescence display panel and display device
  • Organic electroluminescence display panel and display device
  • Organic electroluminescence display panel and display device

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Embodiment Construction

[0031] In the traditional 2T1C pixel circuit, such as figure 1 as shown, figure 1 It is a circuit structure schematic diagram of an existing pixel circuit; the circuit is composed of a driving transistor DTFT, a switching transistor D1 and a storage capacitor Cs', when the scanning line Scan selects a certain row, the scanning line Scan inputs the scanning signal, The switching transistor D1 is turned on, and the voltage of the data line Data is written into the storage capacitor Cs'; when the row scan is completed, the switching transistor D1 is turned off, and the gate voltage stored in the storage capacitor Cs' makes the driving transistor DTFT generate current to drive the OLED, ensuring OLEDs emit light continuously for one frame. Among them, the saturation current formula of the driving transistor DTFT is I OLED =K(V GS -V th ) 2 , as mentioned above, due to the process and device aging, the threshold voltage V of the drive transistor DTFT th will drift, which caus...

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Abstract

The invention discloses an organic electroluminescence display panel and a display device. The threshold voltage of the driving transistor drifts due to reasons such as process, device aging and the like, and the compensation transistor is arranged to compensate the threshold voltage before the pixel driving circuit controls the OLED to display, so that the saturation current of the driving transistor is irrelevant to the threshold voltage of the driving transistor. The orthographic projection of the third metal layer on the substrate covers the orthographic projection of the compensation transistor on the substrate; in this way, electric leakage of the compensation transistor due to illumination can be prevented, so that potential rise of the grid electrode of the driving transistor of the pixel driving circuit due to electric leakage of the compensation transistor in the light-emitting stage can be avoided, and the grid-source voltage of the driving transistor can be prevented from becoming small. Furthermore, attenuation of OLED brightness can be reduced, and the problem of image flickering of the display panel is effectively solved.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an organic electroluminescent display panel and a display device. Background technique [0002] Organic Light Emitting Diode (OLED) is one of the hot spots in the field of flat panel display research today. Compared with liquid crystal displays, OLED has the advantages of low energy consumption, low production cost, self-illumination, wide viewing angle and fast response speed. , OLEDs have begun to replace traditional LCD displays in display fields such as mobile phones, PDAs, and digital cameras. Among them, pixel circuit design is the core technical content of OLED display, which has important research significance. [0003] Unlike LCD, which uses a stable voltage to control brightness, OLED is current-driven and requires a stable current to control light emission. Due to reasons such as process technology and device aging, the threshold voltage V of the driving transistor ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G09G3/3233H01L27/32H01L51/52
CPCG09G3/3233H10K59/1213H10K59/1216H10K59/131H10K50/80
Inventor 何水袁永柳家娴
Owner XIAMEN TIANMA MICRO ELECTRONICS
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