Display Devices

By setting a lower conductive layer in the recessed area on the substrate of the display device and connecting it with the upper conductive layer, the step difference problem between the conductive layer and the semiconductor layer is solved, and uniform formation of polysilicon and high-quality production of the display device are achieved.

CN112216718BActive Publication Date: 2025-03-25SAMSUNG DISPLAY CO LTD
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Patent Information

Application Number
CN202010588927.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2019-07-10
Filing Date
2020-06-24
Publication Date
2025-03-25
Estimated Expiration
2040-06-24

AI Technical Summary

Technical Problem

During the manufacturing process, there is a step difference between the conductive layer and the semiconductor layer in the existing display equipment, resulting in uneven formation of polysilicon and affecting the quality of the display equipment.

Method used

By providing a lower conductive layer in the recessed area of ​​the top surface of the substrate and connecting it with the upper conductive layer through a contact hole, a flat contact between the conductive layer and the semiconductor layer is ensured, thereby reducing step difference.

Benefits of technology

The uniform formation of polysilicon of the semiconductor layer is achieved, the quality and reliability of the display device are improved, and the afterimage problem is reduced.

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Abstract

A display device includes: a substrate defining a concave portion recessed from a top surface of the substrate; a lower conductive layer in the concave portion; an upper conductive layer connected to the lower conductive layer; an insulating layer between the lower conductive layer and the upper conductive layer, and defining a contact hole in the insulating layer, the upper conductive layer being connected to the lower conductive layer at the contact hole; a thin film transistor including a semiconductor layer and a gate electrode on the semiconductor layer; and a display element connected to the thin film transistor.
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