Thin film transistor liquid crystal display (TFT-LCD) array substrate and manufacturing method thereof

Abstract

The invention relates to a thin film transistor liquid crystal display (TFT-LCD) array substrate and a manufacturing method thereof, wherein the manufacturing method comprises the following steps of: 1, depositing a gate metal thin film on a substrate, forming a figure consisting of a gate electrode and a gate line through a first-time composition process; 2, depositing a gate insulating thin film, a semiconductor thin film and a barrier thin film on the substrate subjected to the step 1, forming figures of a semiconductor layer and a barrier layer through a second-time composition process, wherein the barrier layer is used for preventing the semiconductor layer from being etched; and 3, depositing an ohmic contact thin film, a transparent conductive thin film, a source-drain metal thin film and a passivated thin film on the substrate subjected to the step 2, and forming the figures of a source electrode, a drain electrode, a thin film transistor (TFT) channel, a data line, a pixel electrode and a passivation layer through a third-time composition process. The invention can reduce the thickness of the semiconductor layer and the off-state current of a TFT and enhance the performance of the TFT by adopting three times of the composition processes and arranging the barrier layer between the semiconductor layer and an ohmic contact layer in a clamping way.

Description

technical field [0001] The invention relates to a manufacturing method of a thin film transistor liquid crystal display, in particular to a thin film transistor liquid crystal display (Thin Film Transistor Liquid Crystal Display, TFT-LCD for short) array substrate and a manufacturing method thereof. Background technique [0002] TFT-LCD has the characteristics of small size, low power consumption, and no radiation, and occupies a dominant position in the current flat panel display market. For TFT-LCD, the array substrate structure and manufacturing process determine its product performance, yield and price. [0003] In order to effectively reduce the price of TFT-LCD and increase the yield, the manufacturing process of the TFT-LCD array substrate structure has been gradually simplified. Composition (4mask) process. [0004] In the prior art, a gray-tone or half-tone mask is used in the four-step patterning process, and the active layer, data lines, source electrodes, drain...

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Problems solved by technology

[0006] The purpose of the present invention is to provide a TFT-LCD array substrate and its manufacturing method, which overcomes the excessive TFT off-state current caused by the thicker semiconductor layer in the four-time patterning process of the prior art, and the shortening of the pixel electrode charge retention time, which affects the TFT. performance flaws

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