Pixel Driving Transistor Layout for Low-Coupling LED Displays
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Solution Overview
Problem
The mutual interference among signal nodes in pixel driving circuits of LED display panels due to the intensive distribution of transistors and wires within limited space affects the driving capability, particularly in high-resolution displays.
Innovation Solution
The pixel driving circuit design includes a first drive transistor with a first electrode and a second electrode, where the first electrode has a first subsection extending in a first direction and a second subsection extending in a second direction, with the second subsection's area per unit length less than the first subsection's, reducing overlapping areas and parasitic capacitance to improve control accuracy and driving capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If transistors and wires are intensively distributed within limited space to meet high-resolution display demands, then the display resolution is improved, but the mutual interference among signal nodes increases
Solution Approach 1:
The patent applies dimensionality change by extending electrodes in multiple directions (first direction and second direction intersecting at an angle) rather than only along signal line directions. This spatial arrangement redistributes overlapping regions from a concentrated 2D pattern to a distributed 3D configuration, reducing parasitic capacitance while maintaining high-resolution display requirements.
Solution Approach 2:
The patent implements local quality by creating non-uniform electrode structures where the first electrode has different extensions in different directions, and the second electrode has selective overlapping only in specific regions. This localized design reduces parasitic capacitance at critical intersections while preserving necessary electrical connections, thereby reducing mutual interference among signal nodes.
2Object-affected harmful factors
If electrodes are extended in multiple directions to reduce overlapping areas, then parasitic capacitance is reduced, but the device structure becomes more complex
Solution Approach 1:
The patent applies segmentation by dividing the first electrode into multiple subsections (first subsection extending in first direction, second subsection extending in second direction) and the second electrode into corresponding segments. This segmented approach allows precise control of overlapping regions while maintaining a systematic design framework that manages structural complexity.
Solution Approach 2:
The patent implements asymmetry by designing the first and second electrodes with non-symmetric extensions - the first electrode extends primarily in the first direction with selective second-direction extensions, while the second electrode extends in the second direction with controlled first-direction overlaps. This asymmetric configuration optimizes parasitic capacitance reduction while providing clear manufacturing guidelines.
Data Source
AI summary
A display panel includes a base substrate and a pixel driving circuit disposed on a side of the base substrate; the pixel driving circuit includes a first drive transistor, and the first drive transistor includes a first electrode and a second electrode; the first electrode includes a first subsection extending in a first direction, and the second electrode includes a second subsection extending in a second direction; the first subsection includes a first segment and a second segment arranged in the first direction, a vertical projection of the second segment on a base substrate overlaps a vertical projection of the second subsection on the base substrate, and an area of the second segment per unit length is less than an area of the first segment per unit length in the first direction.