Display Fan-Out Line Overlap for Gray-Scale Flicker Reduction
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Solution Overview
Problem
Display devices with multiplexer circuits experience reduced display quality due to gray-scale flickering caused by low frame rates, which results from uneven voltage distribution on data lines due to differences in the length of fan-out lines.
Innovation Solution
The electronic device incorporates a substrate with a fan-out area containing overlapping segments of first and second fan-out lines, which receive data signals of opposite polarities. The multiplexer circuit, located between the active and fan-out areas, couples these lines to reduce voltage differences and improve signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If fan-out lines are extended to cover larger display areas, then the display area is increased, but the voltage distribution on data lines becomes uneven causing gray-scale flickering
Solution Approach 1:
The fan-out lines are divided into multiple segments (first fan-out line with first segment, second fan-out line with second segment) that overlap with each other. This segmentation allows the voltage signal to be distributed through multiple paths, reducing the voltage drop and improving uniformity across the display area.
Solution Approach 2:
The patent introduces overlapping segments in the fan-out area, creating a two-dimensional layout where fan-out lines from different directions intersect and overlap. This dimensional approach allows voltage signals to reach data lines through multiple geometric paths, balancing the voltage distribution across the display.
2Productivity
If multiplexer circuits are used to increase frame rate, then display quality is improved, but uneven voltage distribution on data lines causes gray-scale flickering
Solution Approach 1:
The patent applies different routing strategies to different regions of the display. The fan-out area contains overlapping segments specifically designed to compensate for voltage drops in distant data lines, while the active area maintains standard routing. This local optimization ensures uniform voltage distribution across the entire display while enabling high frame rates.
3Length of stationary object
If fan-out lines are made longer to reach distant data lines, then coverage is increased, but voltage differences increase causing flickering
Solution Approach 1:
Multiple fan-out lines (first fan-out line and second fan-out line) are merged in the fan-out area through overlapping segments. This merging creates redundant signal paths, where the voltage signal can travel through multiple routes simultaneously, reducing the overall voltage drop and ensuring uniform distribution even over long distances.
Data Source
AI summary
An electronic device including a substrate, a first fan-out line, a second fan-out line, and a multiplexer circuit is disclosed. The substrate has an active area and a fan-out area. The first fan-out line is located in the fan-out area and has a first segment. The second fan-out line is located in the fan-out area and has a second segment. The first segment overlaps the second segment. A multiplexer circuit is located between the active area and the fan-out area and coupled to the first fan-out line and the second fan-out line. The first fan-out line receives a first data signal and the second fan-out line receives a second data signal. Polarities of the first data signal and the second data signal are opposite.