Pixel Driving Circuit Layout for Low Gray-Scale Display
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Solution Overview
Problem
The complexity of forming pixel driving circuits in display apparatuses due to the different electrical characteristics of driving and switching thin film transistors, leading to potential image quality deterioration.
Innovation Solution
A display apparatus with a semiconductor pattern featuring a first active region and a second active region, where a first sub-gate overlaps both active channels and a second sub-gate is insulated and disposed between the semiconductor pattern and the first sub-gate, optimizing the channel resistance and driving current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If different electrical characteristics are used for driving and switching thin film transistors, then functional performance is improved, but manufacturing complexity increases
Solution Approach 1:
The patent applies local quality by creating different channel widths within the same transistor structure. The first active channel has a first width while the second active channel has a second width different from the first, allowing different electrical characteristics (driving vs switching functionality) to be achieved in different regions of the semiconductor pattern without requiring different transistor types or complex manufacturing processes.
2Power
If channel width is increased, then driving current is improved, but device area increases
Solution Approach 1:
The patent segments the channel into two distinct active channels with different widths. The first active channel has a larger width optimized for driving current, while the second active channel has a smaller width. This segmentation allows the transistor to achieve high driving current through the first channel without proportionally increasing the overall device area, as the second channel provides additional functionality in a compact form.
Data Source
AI summary
A display apparatus is disclosed to improve low gray-scale image display and increase driving current. A light-emitting device and a pixel driving circuit electrically connected to the light-emitting device may be disposed in each pixel area. The pixel driving circuit may include a driving thin film transistor. A semiconductor pattern of the driving thin film transistor may include a first active region and a second active region parallel to the first active region. A first sub-gate of the driving thin film transistor may be disposed on a first active channel of the first active region and a second active channel of the second active region. The driving thin film transistor may include a second sub-gate between the semiconductor pattern and the first sub-gate. The second active region may include a portion disposed outside the second sub-gate.