LCD Array Substrate Common Line Overlap Aperture Ratio
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Solution Overview
Problem
The aperture ratio of liquid crystal display (LCD) devices is limited due to the design of storage-on-common (SOC) type array substrates, which results in reduced transmittance and increased costs, especially in small-sized devices, as the common lines and data lines occupy significant space, limiting the ability to increase the aperture ratio.
Innovation Solution
The array substrate design includes common lines that overlap and contact each other under the data lines, reducing the occupied space and allowing the pixel electrodes to be closer to the data lines, thereby increasing the aperture ratio without the need for additional common bridge lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If common lines and data lines are arranged separately in traditional SOC-type LCD devices, then the storage capacitor function is achieved, but the aperture ratio is reduced due to the space occupied by these lines
Solution Approach 1:
The patent merges the common lines and data lines by arranging them in an overlapping configuration where common lines extend under data lines. This integration reduces the total space occupied by conductive lines, thereby increasing the aperture ratio while maintaining the storage capacitor function through the overlapping region that forms the storage capacitor electrode.
Solution Approach 2:
The patent utilizes the vertical dimension by extending common lines underneath data lines rather than keeping them strictly planar and separate. This three-dimensional arrangement allows the common lines to occupy space in a different layer, reducing the horizontal space requirement and increasing the aperture area without compromising electrical connectivity.
2Reliability
If additional common bridge lines are added to connect common lines, then the electrical connectivity is improved, but the space occupation increases and aperture ratio decreases
Solution Approach 1:
The patent eliminates the need for separate common bridge lines by integrating the connection function into the overlapping region between common lines and data lines. The storage capacitor electrode formed in the overlapping area serves dual purposes: maintaining electrical connectivity and providing the storage capacitor function, thereby removing the need for additional bridge lines that would occupy space.
Solution Approach 2:
The overlapping region between common lines and data lines serves multiple functions simultaneously: it provides electrical connectivity between common lines, forms the storage capacitor electrode, and maintains signal integrity. This multi-functional design eliminates the need for dedicated bridge lines, reducing space occupation and increasing the aperture ratio.
3Area of moving object
If pixel electrodes are positioned farther from data lines in traditional designs, then interference is reduced, but the aperture ratio is limited
Solution Approach 1:
The patent merges the common lines and data lines into an overlapping configuration that allows pixel electrodes to be positioned closer to data lines without increasing interference. The integrated structure optimizes the spatial relationship between components, enabling closer positioning while maintaining signal integrity through the designed overlapping geometry.
Solution Approach 2:
By transitioning from a planar arrangement to a three-dimensional overlapping configuration, the patent allows pixel electrodes to be positioned closer to data lines in the horizontal plane without increasing interference. The vertical separation achieved through the overlapping structure maintains electrical isolation while reducing horizontal distance, thereby increasing the aperture ratio.
Data Source
AI summary
A LCD device including a substrate, first and second gate lines along a first direction, first through third data lines along a second direction and crossing the first and second gate lines to define first and second pixel regions, first and second TFTs at a crossing of the second gate line and the first data line and a crossing of the second gate line and the second data line, first and second pixel electrodes in the first and second pixel regions, the first pixel electrode connected to the first TFT and the second pixel electrode connected to the second TFT, and first and second common lines between the first and second gate lines and overlapping the first and second pixel electrodes, and connected to each other under the second data line to cover a part of the second data line between the first and second gate lines.