Display panel and manufacturing method thereof

Abstract

The invention discloses a display panel, which comprises a substrate, a metal wiring layer, an OLED light-emitting layer and a barrier layer, wherein the barrier layer is arranged between the metal wiring layer and the OLED light-emitting layer, and the barrier layer covers the metal wiring layer. The barrier layer capable of absorbing ultraviolet light is arranged on the metal wiring layer, ultraviolet light of an exposure machine can be prevented from irradiating the lower metal wiring layer, and thus, when a planarization layer is manufactured subsequently, light of the bottom layer is prevented from being reflected to the planarization layer, the planarization layer is prevented from locally receiving light energy abnormally to generate protrusions or pits, the flatness of a pixel definition area is improved, and the risk of OLED device short circuit or performance abnormity caused by unevenness of a film layer in a pixel is reduced to a great extent.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a display panel and a preparation method thereof. Background technique [0002] With the development of OLED (Organic Light-Emitting Diode, Organic Light-Emitting Diode) technology, there are two ways to prepare OLED devices: evaporation and printing. The thickness of the OLED device between the cathode and the anode is small, usually between 100 ~500 nanometers, so the flatness of the substrate for preparing the OLED device is particularly important, and too large or too steep a step difference in the pixel definition area will cause a short circuit or abnormal performance of the OLED device. [0003] In order to fill the level difference within the pixel definition, a planarization layer is usually made after the TFT (Thin Film Transistor, thin film transistor) device is prepared. The material of the planarization layer is generally an organic photosensitive photoresist, but t...

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Problems solved by technology

[0005] The present invention provides a display panel and its preparation method to solve the problem of existing display panels. Since a large number of metal wires are used in TFT devices, and the sides of the metal wires generally have burr-like protrusions, which will reflect the exposure of the exposure machine. The planarization layer will absorb the light energy of the reflected light to a certain extent, which affects the local film thickness on the surface of the planarization layer, resulting in burr-like protrusions on the surface of the negative planarization film layer or positive planarization layer. Surface pits, which in turn lead to a short circuit of the OLED device, which in turn affects the technical problems of the display

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