Pixel unit and method of fabricating the same, array substrate and display device
First Claim
1. A pixel unit, including a thin film transistor and a pixel electrode, the thin film transistor including a gate, a source and a drain, the pixel electrode being electrically connected to the drain through a via hole, whereina via-hole electrode is provided to fill the via hole, an upper end surface of the via-hole electrode is connected to a lower surface of the pixel electrode, and a lower end surface of the via-hole electrode is connected to the drain,the via hole is a step-shaped hole, and an area of the upper end surface of the via-hole electrode is larger than that of the lower end surface of the via-hole electrode,the via hole includes a large via portion and a small via portion, the via-hole electrode includes a large electrode portion corresponding to the large via portion and a small electrode portion corresponding to the small via portion, andone end surface of the large electrode portion is connected to the pixel electrode, one end surface of the small electrode portion is connected to the drain, and a height of the large electrode portion along a vertical direction is the same as that of the small electrode portion.
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Abstract
The present invention provides a pixel unit including a thin film transistor and a pixel electrode, the thin film transistor includes a gate, a source and a drain, and the pixel electrode is electrically connected to the drain through a via hole. An upper end surface of the via hole is connected to the pixel electrode, and a lower end surface of the via hole is connected to the drain. The via hole is a step-shaped hole, and an area of the upper end surface of the via hole is larger than that of the lower end surface of the via hole. The present invention also provides a method of fabricating the pixel unit, an array substrate including the pixel unit, and a display device including the array substrate.
9 Citations
18 Claims
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1. A pixel unit, including a thin film transistor and a pixel electrode, the thin film transistor including a gate, a source and a drain, the pixel electrode being electrically connected to the drain through a via hole, wherein
a via-hole electrode is provided to fill the via hole, an upper end surface of the via-hole electrode is connected to a lower surface of the pixel electrode, and a lower end surface of the via-hole electrode is connected to the drain, the via hole is a step-shaped hole, and an area of the upper end surface of the via-hole electrode is larger than that of the lower end surface of the via-hole electrode, the via hole includes a large via portion and a small via portion, the via-hole electrode includes a large electrode portion corresponding to the large via portion and a small electrode portion corresponding to the small via portion, and one end surface of the large electrode portion is connected to the pixel electrode, one end surface of the small electrode portion is connected to the drain, and a height of the large electrode portion along a vertical direction is the same as that of the small electrode portion.
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7. A method of fabricating a pixel unit, comprising:
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forming a thin film transistor; forming a via hole that penetrates an upper surface of the thin film transistor to reach a drain of the thin film transistor, the via hole being a step-shaped hole, an area of an upper end surface of the via hole being larger than that of a lower end surface of the via hole; and forming a via-hole electrode that fills the via hole and forming a pixel electrode so that the pixel electrode is electrically connected to the drain through the via hole, wherein an area of an upper end surface of the via-hole electrode is larger than that of a lower end surface of the via-hole electrode, the upper end surface of the via-hole electrode is connected to a lower surface of the pixel electrode and the lower end surface of the via-hole electrode is connected to the drain, the via hole includes a large via portion and a small via portion, the via-hole electrode includes a large electrode portion corresponding to the large via portion and a small electrode portion corresponding to the small via portion, and one end surface of the large electrode portion is connected to the pixel electrode, one end surface of the small electrode portion is connected to the drain, and a height of the large electrode portion along a vertical direction is the same as that of the small electrode portion. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. An array substrate, including a pixel unit comprising a thin film transistor and a pixel electrode, the thin film transistor including a gate, a source and a drain, the pixel electrode being electrically connected to the drain through a via hole, wherein
a via-hole electrode is provided to fill the via hole, an upper end surface of the via-hole electrode is connected to a lower surface of the pixel electrode, and a lower end surface of the via-hole electrode is connected to the drain, the via hole is a step-shaped hole, and an area of the upper end surface of the via-hole electrode is larger than that of the lower end surface of the via-hole electrode, the via hole includes a large via portion and a small via portion, the via-hole electrode includes a large electrode portion corresponding to the large via portion and a small electrode portion corresponding to the small via portion, and one end surface of the large electrode portion is connected to the pixel electrode, one end surface of the small electrode portion is connected to the drain, and a height of the large electrode portion along a vertical direction is the same as that of the small electrode portion.
Specification