LCD Panel Storage Capacitance Line Positioning
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Solution Overview
Problem
Current LCD panels face issues with wide view angle, leading to color shift and color de-saturation due to brightness differences when viewed from different angles, and existing solutions complicate interconnection and reduce aperture ratio, causing flickering and retained images.
Innovation Solution
The LCD panel design includes a thin film transistor substrate with multiple scan lines and pixels, each with three TFTs and a pixel electrode divided into regions, where the storage capacitance line is positioned differently to reduce interconnection complexity and adjust capacitance, ensuring consistent signal levels across regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sub-pixel electrode is divided into multiple regions with different brightness ratios to improve color shift, then color shift compensation is improved, but interconnection complexity increases and aperture ratio decreases
Solution Approach 1:
The patent combines the storage capacitance function with the auxiliary capacitance function into a single integrated structure. The storage capacitance line serves dual purposes: maintaining storage capacitance for each sub-pixel region while also providing auxiliary capacitance to compensate for feed-through effects. This merging eliminates the need for separate auxiliary capacitance structures and their associated interconnections, thereby reducing interconnection complexity while maintaining color shift compensation capability.
Solution Approach 2:
The storage capacitance line is designed to perform multiple functions simultaneously: it acts as the storage capacitance electrode for maintaining voltage in each sub-pixel region, and also serves as the auxiliary capacitance electrode for compensating feed-through effects in divided brightness regions. This multi-functionality reduces the overall number of components and interconnections needed in the display panel.
2Reliability
If the sub-pixel electrode is divided into multiple regions with different brightness ratios to improve color shift, then color shift compensation is improved, but aperture ratio decreases
Solution Approach 1:
By merging the storage capacitance and auxiliary capacitance functions into a single integrated structure using the same storage capacitance line, the patent eliminates redundant capacitance structures. This integration reduces the total area occupied by capacitance elements and their interconnections, thereby increasing the aperture ratio while maintaining the ability to compensate for color shift in divided brightness regions.
3Ease of manufacture
If the storage capacitance line is positioned at the middle position of the sub-pixel electrode to maintain symmetry, then manufacturing is simplified, but interconnection loading increases and capacitance adjustment becomes difficult
Solution Approach 1:
The patent applies different positioning strategies for the storage capacitance line in different regions of the sub-pixel electrode. In the first brightness region, the storage capacitance line is positioned to optimize storage capacitance, while in the second brightness region, it is positioned to provide auxiliary capacitance for feed-through compensation. This localized differentiation allows the system to achieve both manufacturing simplicity and reduced interconnection loading by optimizing each region's capacitance line position for its specific function.
4Reliability
If additional interconnection is added to the storage capacitance line to adjust capacitance, then color shift compensation is improved, but aperture ratio decreases
Solution Approach 1:
The patent merges the auxiliary capacitance function into the existing storage capacitance line structure, eliminating the need for additional separate interconnections. The storage capacitance line itself is configured to provide both storage capacitance and auxiliary capacitance functions through strategic positioning in different sub-pixel regions, thereby achieving color shift compensation without adding extra interconnection elements that would reduce aperture ratio.
Data Source
AI summary
A liquid crystal display (LCD) panel includes pixels arranged in matrix, and first and second scan lines and a storage capacitance line. Each pixel has a first sub-pixel, which is disposed between the first and second scan lines, and first to third thin-film transistors (TFTs) and a pixel electrode divided into first and second regions. The first TFT is electrically connected to the first scan line and the first region. The second TFT is electrically connected to the first scan line and the second region. The third TFT is electrically connected to the second scan line and the second region. The storage capacitance line is electrically connected to the third TFT. A distance between the storage capacitance line and the first scan line is longer than that between the storage capacitance line and the second scan line.