COA (color-filter on array) substrate

Abstract

The invention provides a COA (color-filter on array) substrate. 3T design and DBS (data line BM less) design are adopted simultaneously, in each pixel unit, a source of a shared thin film transistor is electrically connected with the corresponding metal common electrode wire through a floating block arranged in a first via hole, and the floating block is electrically connected with a DBS common electrode wire through a first lead introduced into the first via hole where the floating block is located. By means of the characteristic that DBS common electrode wires are idiostaic with floating blocks, the DBS common electrode wires are electrically connected with the floating blocks through the first leads, that is, the first leads are introduced into the first via holes where the floating blocks are located, so that a PI (polyimide) liquid flows conveniently into the first via holes where the floating blocks are located in a PI process under the drainage action of the first leads, mura of sloping grains can be improved effectively, product quality is improved, and cost for equipment transformation and upgrading is saved.

Description

technical field [0001] The present invention relates to the field of display technology, in particular to a COA type array substrate. Background technique [0002] A liquid crystal display (Liquid Crystal Display, LCD) has many advantages such as a thin body, power saving, and no radiation, and has been widely used. Such as: LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer screen or laptop screen, etc. [0003] Generally, a liquid crystal display device includes a housing, a liquid crystal panel disposed in the housing, and a backlight module disposed in the housing. Among them, the structure of the liquid crystal panel is mainly composed of a thin film transistor array (Thin Film Transistor Array, TFT Array) substrate, a color filter (Color Filter, CF) substrate, and a liquid crystal layer (Liquid Crystal Layer) arranged between the two substrates. Its working principle is to control the rotation of the liquid crystal molecules in the liqui...

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Problems solved by technology

[0009] However, due to the introduction of deep holes in the pixel structure, the corresponding requirements for the performance of PI coating equipment will also increase, because in the general case of PI coating equipment capabilities (the minimum amount of PI droplets spit out is 75ng), Due to the surface tension of PI liquid, poor diffusion of PI liquid near the deep hole will occur during the PI process, resulting in the accumulation of PI liquid around the deep hole, which will cause uneven brightness (mura) of twill lines on the product, seriously affecting product quality , and for the shallow hole, because the ITO lead of the pixel electrode enters the shallow hole, the PI liquid can easily enter the shallow hole, so that there is no accumulation of PI liquid

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