OLED display panel and preparation method thereof

Abstract

The invention discloses an OLED display panel and a preparation method. The OLED display panel comprises a glass substrate, a first bottom gate, a light shielding layer, a buffer layer, a first polycrystalline silicon layer, a second polycrystalline silicon layer, a gate insulating layer, a first top gate, a second top gate, an interlayer insulating layer, a first source electrode, a first drain electrode, a second source electrode, a second drain electrode, a passivation layer, a planarization layer, a pixel electrode, a pixel definition layer, an OLED light-emitting device and a cathode metal layer. The first source electrode is in contact with the first bottom grid electrode through a via hole, and the second source electrode is in contact with the light shielding layer through anothervia hole.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an OLED display panel and a preparation method thereof. Background technique [0002] With the development of the field of flat panel display, the panel display tends to be more and more high-frequency and high-resolution, and higher requirements are put forward for the panel driver. At present, the pixel driving circuit of AMOLED (active matrix light-emitting diode panel) display usually adopts TFT (thin film transistor) array substrate, and its carrier concentration is ten times that of amorphous silicon compared with amorphous silicon. TFT adopts low-temperature polysilicon (LTPS) material. Because of its high mobility, smaller TFTs can be used to drive the deflection of liquid crystal molecules, better meet the requirements of driving current, and are more and more widely used. It has been found in the prior art that double-gate low-temperature polysilicon thin-film transis...

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Problems solved by technology

[0004] The present invention provides a liquid crystal display panel, which can protect the through-hole structure corresponding to the frame glue from short circuit caused by water vapor corrosion, so as to solve the problem of existing liquid crystal display panels. Part of the via structure is covered to realize the connection between the functional signal line and the GOA line. The frame glue absorbs water vapor and causes the contact via structure to be corroded, thereby affecting the technical problem of the display.

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