Array Substrate Common Electrode Segmentation for Voltage Stability
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Solution Overview
Problem
In liquid crystal display panels, the high electrical resistance of common electrodes due to metallic conducting wires causes unstable voltage conditions, leading to a greenish phenomenon and potential open-circuit or short-circuit failures, which affect aperture ratio and transmittance, and existing segmented common electrode designs can result in non-repairable failures and lowered product yield.
Innovation Solution
An array substrate design with first and second signal lines in separate layers, intersecting and insulated, and common electrodes with compensation lines within pixel regions of minimal transmittance, ensuring constant voltage without overlapping with signal lines, allowing for repair without affecting transmittance and minimizing production costs through simultaneous patterning processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the common electrode is formed using transparent electrically conductive film ITO to increase aperture ratio, then the aperture ratio is improved, but the electrical resistance increases causing unstable voltage and greenish phenomenon
Solution Approach 1:
The common electrode is divided into multiple segments (first common electrode, second common electrode, third common electrode) that are electrically connected through compensation lines. This segmentation allows each segment to be independently controlled and compensated, reducing the overall electrical resistance and improving voltage stability while maintaining the high aperture ratio achieved through transparent conductive film.
2Reliability
If the common electrode is designed in a segmented manner with compensation lines overlapping data lines to ensure constant voltage, then the voltage stability is improved, but open-circuit or short-circuit failures occur resulting in lowered product yield
Solution Approach 1:
The compensation lines are arranged in a specific spatial configuration where they extend in the row direction and are positioned between data lines in the column direction. This dimensional arrangement ensures that compensation lines do not overlap with data lines, eliminating the risk of open-circuit or short-circuit failures while still providing effective voltage compensation across the common electrode segments.
3Reliability
If common electrode compensation lines are arranged to overlap data lines to ensure constant voltage, then the voltage stability is improved, but repairability of data lines is affected
Solution Approach 1:
The compensation function is extracted and implemented through dedicated compensation lines that are spatially separated from data lines. By positioning compensation lines in the row direction between data lines (which run in the column direction), the compensation function is achieved without interfering with data line routing, thereby maintaining full repairability of data lines while ensuring constant voltage across the common electrode.
Data Source
AI summary
The embodiment of the present application discloses an array substrate, a liquid crystal display panel, and a display device, with first common electrode compensation lines being arranged within pixel regions which correspond to pixels provided with a minimal transmittance, by which first common electrode compensation lines a common electrode is charged so as to ensure a constant voltage on the common electrode. Moreover, since the first common electrode compensation lines are configured to overlap neither first signal lines nor second signal lines, a repairmen of the first signal lines or the second signal lines will not be adversely affected in case that there is short-circuit or open-circuit thereon. Besides, since the common electrode compensation lines are arranged within pixel regions provided with the lowest transmittance, the influence onto overall transmittance of the display panel is minimized relatively.