Array Substrate With Shared Scan Lines For Aperture Ratio
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Solution Overview
Problem
Conventional LCD array substrates require a large layout area, result in low utilization of data lines and scan lines, increasing production costs and reducing the aperture ratio due to the regular connection method of sub-pixels.
Innovation Solution
The array substrate design features data lines and scan lines that run across but do not touch each other, with RGB sub-pixels lined in parallel along the data lines, each connected via a TFT, and neighboring pixel areas having different scan lines, reducing the number of data lines and layout area while increasing the aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If sub-pixels are connected to scan lines and data lines using conventional regular connection method, then each sub-pixel can be electrically connected to receive scan signals and data signals, but the layout room required is large, occupying areas covered by photoshield and lowering the aperture ratio
Solution Approach 1:
Multiple sub-pixels share common scan lines and data lines. Specifically, multiple even-numbered sub-pixels share a common even scan line, and multiple odd-numbered sub-pixels share a common odd scan line. Similarly, multiple sub-pixels share common data lines. This merging reduces the total number of scan lines required, freeing up layout space that can be converted to aperture area.
Solution Approach 2:
Scan lines are designed to serve multiple functions: they act as both gate lines for TFT control and as signal distribution lines for multiple sub-pixels. The same applies to data lines which serve multiple sub-pixels simultaneously. This multi-functionality reduces the overall line density and increases the aperture ratio.
2Reliability
If conventional regular connection method is used for sub-pixels, then complete electrical connection is achieved, but the utilization rate of data lines and scan lines is low, wasting resources and increasing production cost
Solution Approach 1:
The patent merges the connection paths by having multiple sub-pixels share common scan lines and data lines. Instead of dedicating separate lines to each sub-pixel, the same lines are reused across multiple sub-pixels, significantly reducing the total line count while maintaining complete electrical connectivity.
Solution Approach 2:
Instead of connecting each sub-pixel to unique scan lines in sequential order, the patent inverts the connection pattern by grouping sub-pixels by parity (even/odd) and connecting them to corresponding parity-matched scan lines. This inverted grouping strategy enables efficient line sharing and reduces overall complexity.
3Reliability
If more data lines and scan lines are used to ensure proper sub-pixel connection, then electrical connection is improved, but the layout area increases and production cost increases
Solution Approach 1:
By merging multiple sub-pixel connections into shared scan lines and data lines, the total number of lines is reduced. This reduction directly decreases the layout area required and simplifies the manufacturing process, thereby lowering production costs while maintaining reliable electrical connections.
Solution Approach 2:
The patent changes the connection parameter from one-to-one mapping to many-to-one mapping, where multiple sub-pixels map to a single scan line or data line. This parameter change optimizes the line utilization rate and reduces the overall system complexity, leading to cost-effective manufacturing.
Data Source
AI summary
The present invention propose an array substrate and a liquid crystal display device. The array substrate includes data lines and scan lines and a plurality of red, green and blue sub-pixels. The data lines and scan lines run across but not touching each other. The red, green and blue sub-pixels are lined in parallel along the data lines. Each sub-pixel connects corresponding scan line and data line via a thin film transistor. Each pixel area is installed with at least one sub-pixel, and scan lines forming two neighboring pixel areas are different. The two neighboring sub-pixels have opposite polarity, and sub-pixels lined horizontally along the scan lines have the same color. The present invention requires the fewer number of data lines, saving the cost of the array substrate. The present invention also saves the layout room on the array substrate, reduces non-transparent areas, and increases aperture ratio.