Display Substrate Recessed Contact Structure for Lower Resistance
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Solution Overview
Problem
Current display substrates for active matrix organic light emitting diode (AMOLED) devices face challenges in achieving sufficient contact area and reduced contact resistance between drain electrodes and conductive light-shielding structures, leading to poor electrical connection and increased contact resistance.
Innovation Solution
The display substrate design includes a conductive light-shielding structure with a recessed portion and a contact hole that penetrates the interlayer insulating layer and buffer layer, increasing the contact area between the drain electrode and the conductive light-shielding structure, and a surface area of the recessed portion closer to the conductive layer is larger than its orthographic projection on the base substrate, enhancing electrical connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional flat conductive light-shielding structure is used, then the manufacturing process is simple, but the contact area between drain electrode and light-shielding structure is insufficient leading to high contact resistance
Solution Approach 1:
The conductive light-shielding structure transitions from a flat two-dimensional surface to a three-dimensional structure with recessed portions. These recesses create additional contact surfaces within the vertical dimension, allowing the drain electrode to make contact with the light-shielding structure at multiple levels, thereby increasing the effective contact area and reducing contact resistance without significantly complicating the manufacturing process
Solution Approach 2:
The recessed portions are strategically positioned at specific locations where the drain electrode requires enhanced contact with the light-shielding structure. This localized modification concentrates the contact area improvement where it is most needed, rather than uniformly increasing complexity across the entire structure, thus improving electrical connection quality while maintaining manufacturing simplicity
Data Source
AI summary
A display substrate and a display device are disclosed. In the display substrate, each sub-pixel includes: a conductive light-shielding structure; a buffer layer; a semiconductor layer; an interlayer insulating layer, located on a side of the semiconductor layer away from the buffer layer; and a conductive layer, located on a side of the interlayer insulating layer away from the semiconductor layer, and including a conductive structure. The conductive light-shielding structure includes a first main body portion and a first recessed portion, an average thickness of the first recessed portion is smaller than an average thickness of the first main body portion. The display substrate further includes a first contact hole, the first contact hole penetrates both the interlayer insulating layer and the buffer layer, the conductive structure is electrically connected with the first recessed portion through the first contact hole.