Capacitor structure, pixel circuit and AMOLED display device

Abstract

The invention relates to the technical field of display devices, in particular to a capacitor structure, a pixel circuit and an AMOLED display device.The capacitor structure comprises a first electrode plate and a second electrode plate which are sequentially arranged in a stacked mode from bottom to top, the orthographic projection of the second electrode plate on a substrate falls into the orthographic projection of the first electrode plate on the substrate, a gap b is formed between each edge of the second electrode plate and each edge of the corresponding first electrode plate, and the capacitor structure is also provided with a contact hole for exposing the first electrode plate; in conclusion, under the influence of process deviation, when the line width of the first electrode plate fluctuates within the range of the gap b, the opposite areas of the first electrode plate and the second electrode plate are the area of the second electrode plate, so that the capacitance value is ensured to be fixed, the compensation effect of the pixel circuit on the threshold voltage is further ensured, and the image quality of a display device is improved.

Description

technical field [0001] The invention relates to the technical field of display devices, in particular to a capacitor structure, a pixel circuit and an AMOLED display device. Background technique [0002] Organic light-emitting diode (OLED) display devices have many advantages such as self-illumination, low driving voltage, high luminous efficiency, short response time, and wide operating temperature range, and are recognized by the industry as the most promising display device; OLED display panels are driven according to The methods can be divided into two categories: passive matrix OLED (Passive Matrix OLED, PMOLED) and active matrix OLED (Active Matrix OLED, AMOLED). Among them, the AMOLED panel has pixels arranged in an array, belongs to the active display type, has high luminous efficiency, and is usually used in large-sized display devices with high definition. [0003] In order to eliminate the difference in threshold voltage between different pixels, existing convent...

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Problems solved by technology

[0005] The purpose of this application is to provide a capacitive structure, a pixel circuit and an AMOLED display device, so as to solve the problem that the line width of the first electrode plate fluctuates due to the process deviation in the prior art, which causes the first electrode plate to be separated from the second electrode plate. The technical problem that the size of the corresponding capacitance also changes when the area of ​​the front face changes.

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