Liquid Crystal Display Common Line Mesh Structure
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Solution Overview
Problem
Active matrix liquid crystal displays face issues with common voltage distortion due to resistance in common lines, leading to ripple phenomena, horizontal crosstalk, luminance differences, and image sticking, which limit aperture ratio and increase in manufacturing costs.
Innovation Solution
The liquid crystal display optimally disposes common lines with edge common lines and longitudinal common lines forming a mesh structure, connected through multiple input units, reducing resistance and distributing load, thereby maintaining constant common voltage and increasing aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If common lines are formed parallel to gate lines to supply common voltage to pixels, then common voltage can be distributed across the display, but the resistance of common lines increases causing voltage distortion and ripple phenomena
Solution Approach 1:
The common line structure is segmented into multiple independent common lines instead of using a single continuous common line. Each common line is assigned to specific pixel rows or columns, which divides the total resistance and reduces voltage distortion. This segmentation allows each common line to serve a limited area, reducing the cumulative resistance effect while maintaining comprehensive voltage distribution across the entire display panel.
2Reliability
If the resistance of common lines is reduced to minimize RC delay, then voltage distortion is reduced, but the aperture ratio decreases due to wider common lines occupying more space
Solution Approach 1:
By dividing the common voltage distribution into multiple separate common lines, each line can be optimized for minimal resistance without requiring excessive width. The segmented approach allows common lines to be positioned strategically around pixel electrodes rather than requiring wide continuous lines across the entire display, thus maintaining low resistance while preserving aperture ratio.
Solution Approach 2:
The common line structure transitions from a single-dimension continuous line to a two-dimensional mesh or grid pattern. This dimensional change allows common lines to distribute voltage more efficiently by utilizing both horizontal and vertical pathways, reducing the need for any single line to be excessively wide while achieving comprehensive voltage distribution across the display panel.
3Reliability
If as many common lines as horizontal lines are formed to supply common voltage, then voltage distribution is improved, but the number of common lines increases complexity and manufacturing difficulty
Solution Approach 1:
The common line system is segmented into a manageable number of distinct lines that can be systematically assigned to pixel rows or columns. This segmentation creates a regular pattern that simplifies manufacturing processes, as each common line follows a predictable path and can be fabricated using standardized photolithography masks, reducing overall complexity despite the increased number of lines.
Solution Approach 2:
Multiple common lines are merged with the existing gate line and data line structures to share fabrication processes and alignment references. By integrating common lines with other existing circuit elements, the patent reduces the incremental complexity of adding multiple common lines, as they can be formed using similar material layers and processing steps already established in the display manufacturing workflow.
Data Source
AI summary
A liquid crystal display is provided. In the liquid crystal display, a common line includes an edge common line that is formed in a non-display area outside a display area of a liquid crystal display panel to receive a common voltage through a plurality of input units, a plurality of pixel common line patterns that are formed along edges of each of subpixels to be electrically connected to one another, and a plurality of longitudinal common lines that is electrically connected to the edge common line to apply the common voltage to the pixel common line patterns. Each of the pixel common line patterns has a mesh structure and is connected to common electrodes of the subpixels. Each of the longitudinal common lines is formed between two horizontally adjacent pixels in a direction parallel to the data lines.