Display Panel Gate Driving Circuit Impedance Matching
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Solution Overview
Problem
The increasing demand for high-resolution display panels with narrow frames leads to impedance mismatch issues in signal lines, causing bright/dark lines on the display screen due to the density of signal lines in the peripheral region.
Innovation Solution
A display panel design that includes a gate driving circuit with first, second, and dummy signal lines arranged in specific directions and connected via contact structures, ensuring uniform cross-over capacitance distribution, thereby preventing impedance mismatch and enhancing display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the density of signal lines in the peripheral region is increased to achieve high resolution, then the display resolution is improved, but impedance mismatch occurs causing bright/dark lines on the display screen
Solution Approach 1:
The signal lines are segmented into three types: first signal lines extending in a first direction, second signal lines extending in a second direction, and dummy signal lines extending in the first direction. This segmentation allows each line type to be optimized independently for its specific function, with first and second signal lines carrying actual signals and dummy signal lines providing impedance matching without affecting display resolution
Solution Approach 2:
Different regions of the peripheral area are assigned different functions: first signal lines are placed in regions requiring signal transmission, second signal lines are placed in regions requiring impedance matching, and dummy signal lines are placed in regions where impedance matching is critical but signal transmission is not needed. This local differentiation allows the system to maintain high resolution while preventing impedance mismatch in specific areas
2Area of stationary object
If the frame width is reduced to achieve a narrow frame design, then the display area ratio is improved, but signal line impedance mismatch becomes more severe
Solution Approach 1:
Dummy signal lines serve as intermediary elements between the first signal lines and the second signal lines. These dummy lines are specifically designed to provide impedance matching functionality without interfering with the signal transmission of the first and second signal lines, thereby enabling narrow frame design while maintaining signal integrity
Solution Approach 2:
The dummy signal lines are configured as copies of the first signal lines in terms of their physical structure and material properties, but they differ in function. These copied lines replicate the impedance characteristics needed for matching without carrying actual display signals, thus enabling the narrow frame design while maintaining electrical integrity
Data Source
AI summary
A display panel including a pixel array substrate, an opposite substrate, and a display media is provided. The pixel array substrate includes a substrate, a plurality of scan lines, a plurality of data lines, a plurality of pixel units, and a gate driving circuit. The gate driving circuit including a plurality of first signal lines, a plurality of second signal lines, a plurality of dummy signal lines, and a plurality of contact structures is disposed in a peripheral region of the substrate. Each of the second signal lines is electrically connected to one corresponding first signal line. Each of the dummy signal lines is electrically connected to one corresponding second signal line via one corresponding contact structure. Each of the first signal lines is electrically connected to the corresponding second signal line via one corresponding contact structure.