Semiconductor Layer Segmentation for Display Device Resistance
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Solution Overview
Problem
Display devices, such as OLEDs and LCDs, face challenges in reducing the electrical resistance of semiconductor layers, which affects the reliability of transistors and overall device performance.
Innovation Solution
The design incorporates a semiconductor layer with a specific pattern of holes and sub-areas, aligned with electrodes, to reduce resistance by creating current flow paths, and using the same conductive layer for gate and source/drain electrodes to simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the semiconductor layer is made thinner to reduce resistance, then electrical resistance decreases, but the transistor's current driving capability and reliability deteriorate
Solution Approach 1:
The semiconductor layer is segmented into multiple regions with different thicknesses: a first region (source/drain region) with reduced thickness to lower resistance, and a second region (channel region) with maintained or increased thickness to preserve current driving capability. This segmentation allows each region to be optimized for its specific function, resolving the contradiction between reducing resistance and maintaining reliability.
2Ease of manufacture
If the gate electrode and source/drain electrodes are composed of the same conductive layer, then manufacturing process is simplified, but electrode performance and reliability may deteriorate
Solution Approach 1:
Different regions of the same conductive layer are assigned different local properties: the gate electrode region is optimized for electrical control function, while the source/drain electrode regions are optimized for current conduction. This is achieved through selective thickness adjustment and material composition variation in different areas of the conductive layer, allowing each electrode to perform its specific function optimally while maintaining manufacturing simplicity.
Data Source
AI summary
Provided is a display device which comprises a substrate, a first insulating layer disposed on the substrate, a semiconductor layer disposed on the first insulating layer, wherein the semiconductor layer includes an active pattern, a second insulating layer disposed on the semiconductor layer, and a first conductive layer disposed on the second insulating layer. The display device further comprises a gate electrode and source/drain electrodes composed of the same conductive layer, and comprises a semiconductor layer having reduced resistance against an electrical signal applied to the transistor. Thus, reliability of the display device is improved due to the decrease in the resistance of the semiconductor layer.