Flexible Display TFT Layout for Low-Power Line Isolation
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Solution Overview
Problem
Current display devices face challenges in achieving low power consumption, which is essential for portable and wearable devices, but they struggle to realize this due to inefficiencies in their design and materials.
Innovation Solution
The use of a display device with a combination of thin film transistors, including those with polycrystalline semiconductor layers for switching transistors and oxide semiconductor layers for drive transistors, along with a specific layout of supply lines and overlapping configurations to minimize power consumption and prevent signal line shorting, while simplifying the manufacturing process by forming openings and contact holes through the same process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If display devices use conventional transistor structures and materials, then manufacturing processes are simpler, but power consumption cannot be reduced sufficiently
Solution Approach 1:
The patent divides the transistor structure into distinct functional regions: a bending area with openings for flexibility and an active area with contact holes for electrical connections. This segmentation allows each region to be optimized independently - the bending area enables portability while the active area maintains electrical performance, resolving the contradiction between power reduction and structural complexity.
Solution Approach 2:
The patent applies different structural configurations to different regions: openings are disposed in the bending area to enable flexibility and reduce material usage, while contact holes are formed in the active area to ensure proper electrical connections. This local differentiation allows the device to achieve low power consumption in portable applications without compromising the functional requirements of the active display area.
2Adaptability or versatility
If openings in bending area have different depths from contact holes, then structural flexibility is improved, but manufacturing process complexity increases
Solution Approach 1:
The patent merges the formation of openings in the bending area with the formation of contact holes in the active area into a single manufacturing process step. By configuring the openings to have the same depth as the contact holes, the patent enables both features to be created simultaneously through the same etching or deposition process, thereby achieving bending flexibility without increasing manufacturing complexity.
3Area of stationary object
If high-potential and low-potential supply lines are placed close together, then area utilization is improved, but signal line shorting risk increases
Solution Approach 1:
The patent resolves the contradiction between area utilization and signal line insulation by transitioning from a two-dimensional planar arrangement to a three-dimensional stacked configuration. High-potential and low-potential supply lines are disposed at different vertical levels (different dimensions) rather than being placed side-by-side in the same plane. This dimensional separation maintains electrical insulation while achieving compact area utilization, preventing signal line shorting without sacrificing space efficiency.
Data Source
AI summary
Disclosed is a display device that with low power consumption. The display device includes a first thin film transistor having a polycrystalline semiconductor layer in an active area and a second thin film transistor having an oxide semiconductor layer in the active area, wherein at least one opening disposed in a bending area has the same depth as one of a plurality of contact holes disposed in the active area, whereby the opening and the contact holes are formed through the same process, and the process is therefore simplified, and wherein a high-potential supply line and a low-potential supply line are disposed so as to be spaced apart from each other in the horizontal direction, whereas a reference line and the low-potential supply line are disposed so as to overlap each other, thereby preventing signal lines from being shorted.