Branched Pixel Structure for Lower Feed-Through Voltage
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Solution Overview
Problem
High PPI display technologies face challenges due to insufficient charging capacity, primarily attributed to high feed-through voltage and limited pixel storage capacitance, which is difficult to increase without compromising device miniaturization and performance.
Innovation Solution
A pixel structure with a scan line and semiconductor pattern featuring a branch structure, where the second channel region has a width less than the first channel region, reducing stray capacitance and feed-through voltage without increasing gate delay, thereby enhancing charge capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the width of the channel of the pixel structure is reduced, then the feed-through voltage is reduced and charging capability is improved, but gate delay increases and charging capability becomes unequal on left and right sides of the panel
Solution Approach 1:
The scan line is divided into two separate lines: a first scan line that forms a first thin-film transistor with a first channel, and a second scan line that forms a second thin-film transistor with a second channel. This segmentation allows independent optimization of each channel's width to reduce feed-through voltage while maintaining adequate charging capability and minimizing gate delay.
2Object-affected harmful factors
If the storage capacitance of the pixel structure is increased, then the feed-through voltage is reduced, but the pixel pitch must be increased which conflicts with high-PPI miniaturization requirements
Solution Approach 1:
The invention optimizes the local properties of the channel regions by making the width of the first channel different from the width of the second channel. This allows tailored reduction of feed-through voltage in specific regions without requiring overall increase in pixel area, thus maintaining high-PPI compatibility.
3Object-affected harmful factors
If the voltage difference of TFT when turned on and turned off is reduced, then the feed-through voltage is reduced, but charging capability is reduced
Solution Approach 1:
By segmenting the scan control into two separate TFTs with different channel widths, the invention can reduce feed-through voltage through the narrower channel while the broader channel maintains adequate charging capability, thus resolving the trade-off between reducing voltage difference and maintaining charging power.
Data Source
AI summary
The present application discloses a pixel structure and a display device. The pixel structure includes a scan line having a branch structure; and a semiconductor pattern intersecting with the scan line and the branch structure. The semiconductor pattern includes: a first channel region disposed below the scan line; a second channel region disposed below the branch structure; and doping regions respectively disposed at two sides of the first channel region and at two sides of the second channel region. Wherein, the width of the second channel region is less than the width of the first channel region. The pixel structure may improve the display performance of the display screen.