Liquid Crystal Display Storage Line Auxiliary Capacitor Design
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Solution Overview
Problem
Liquid crystal display devices face a reduction in aperture ratio due to the presence of dead spaces in the common electrode, which affects display quality and kick-back, especially when capacitors are added to improve capacitance.
Innovation Solution
The formation of auxiliary capacitors that correspond to openings in the common electrode, utilizing the storage line and drain electrode to overlap with the opening, thereby increasing capacitance without reducing the aperture ratio, and eliminating the need for additional masks in the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If capacitors are added to improve capacitance, then capacitance increases, but aperture ratio decreases due to dead spaces in the common electrode
Solution Approach 1:
The patent extends the storage line from a single-plane configuration to a multi-dimensional structure that projects onto both the first substrate (array substrate) and the second substrate (color filter substrate). The storage line includes a first portion on the first substrate and a second portion on the second substrate, creating a three-dimensional capacitor structure that utilizes vertical space rather than consuming horizontal aperture area.
Solution Approach 2:
The auxiliary capacitor is nested within the existing pixel structure by positioning it to overlap with the opening in the common electrode. The storage line's second portion is formed on the color filter substrate within the pixel region, effectively nesting the capacitor function within the available space without requiring additional lateral area that would reduce aperture ratio.
2Quantity of substance
If additional capacitors are added to increase capacitance, then manufacturing complexity increases due to additional masks
Solution Approach 1:
The storage line serves multiple functions simultaneously: it provides the storage function for the auxiliary capacitor by forming both the first portion on the array substrate and the second portion on the color filter substrate. This multi-functional design eliminates the need for separate capacitor electrodes and reduces the number of photomask patterns required during manufacturing.
Solution Approach 2:
The patent merges the formation of the auxiliary capacitor with the existing storage line structure. The storage line is configured to extend across both substrates and overlap with the common electrode opening, combining the capacitor formation process with the existing pixel electrode and storage line fabrication steps, thereby avoiding additional manufacturing complexity.
3Quantity of substance
If the storage line is extended to form auxiliary capacitor, then capacitance increases, but device structure becomes more complex
Solution Approach 1:
The storage line transitions from a two-dimensional planar structure on the first substrate to a three-dimensional structure that extends to the second substrate. The first portion resides on the array substrate while the second portion projects onto the color filter substrate, utilizing the vertical dimension between substrates to create capacitor area without increasing lateral device footprint.
Solution Approach 2:
The storage line exhibits different configurations in different regions: the first portion on the first substrate has one configuration, while the second portion on the second substrate has a different configuration optimized for overlapping the common electrode opening. This localized differentiation allows the structure to serve multiple functions while maintaining overall simplicity.
Data Source
AI summary
A liquid crystal display device includes a pixel region defined by a gate line and a data line, a thin film transistor in the pixel region, and a storage line in the pixel region. The storage line includes a first portion extending in a direction parallel to the gate line, and a second portion split from the first portion in a direction toward the pixel electrode and extending in a direction parallel to the data line. A common electrode corresponds to the pixel region on a second substrate combined with a first substrate to accommodate a liquid crystal layer, and an opening in the common electrode corresponds to a pixel electrode. The drain electrode includes a first region overlapping the first portion of the storage line and a second region overlapping the second portion of the storage line. The second portion of the storage line and the second region of the drain electrode correspond to the opening.