Pixel Electrode Overlap with Common Electrode for Storage Capacitor
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Solution Overview
Problem
Conventional liquid crystal display pixel structures suffer from reduced transmittance and increased power consumption due to non-light-transmitting areas and displaying inhomogeneity caused by the arrangement of storage capacitance, either overlapping the common electrode or the gate line.
Innovation Solution
A pixel structure where the pixel electrode overlaps the common electrode of a color filter substrate to form a storage capacitor, with the capacitor located at a via hole or diagonal corner, enhancing transmittance and reducing energy consumption while maintaining manufacturing cost and process integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the common electrode is arranged on the array substrate with a portion overlapping the pixel electrode to form storage capacitance, then the storage capacitance is provided for stabilizing the potential of the pixel electrode, but a non-light-transmitting area is formed on the center of the pixel structure, leading to reduction of aperture rate and transmittance of the liquid crystal display panel
Solution Approach 1:
The patent moves the storage capacitance from the array substrate to the color filter substrate, utilizing the space dimension on the opposite substrate. This relocates the capacitance-forming electrodes to an area that does not obstruct the central light path, thereby maintaining transmittance while providing the necessary storage capacitance for potential stabilization.
Solution Approach 2:
The storage capacitance structure is extracted from the array substrate and relocated to the color filter substrate. This separation allows the capacitance function to be maintained while removing the obstruction to light transmission from the pixel center area.
2Reliability
If the pixel electrode has a portion overlapping a gate line to serve as storage capacitance, then the storage capacitance is provided, but the loading of the gate line increases, leading to displaying inhomogeneity of the liquid crystal display panel
Solution Approach 1:
The storage capacitance is extracted from the gate line structure and relocated to the color filter substrate. This removes the additional loading from the gate line, preventing displaying inhomogeneity while maintaining the potential stabilization function through the common electrode and pixel electrode overlap on the color filter substrate.
3Reliability
If the aperture rate of the pixel structure is reduced due to non-light-transmitting areas, then the storage capacitance can be formed, but the energy consumption of the liquid crystal display increases
Solution Approach 1:
By relocating the storage capacitance formation to the color filter substrate in a different spatial dimension from the liquid crystal layer, the patent maintains the capacitance function without reducing the aperture rate. This preserves light transmission efficiency and prevents increased power consumption while still providing the necessary storage capacitance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration increases liquid crystal display transmittance, reduces energy consumption, and enhances displaying homogeneity without altering the existing manufacturing process or increasing costs.
Implementation Method 1
the pixel electrode has a portion overlapping a common electrode of a color filter substrate to serve as storage capacitance
Data Source
AI summary
The present invention provides a structure of a pixel, which includes an array substrate (10), a color filter substrate (20), and a liquid crystal layer (30) between the array substrate (10) and the color filter substrate (20). The array substrate (10) includes a first substrate (11), a data line (12) and a gate line (13) arranged on the first substrate (11), and a pixel unit (14). The pixel unit (14) includes a thin-film transistor (15) and a pixel electrode (16). The thin-film transistor (15) is electrically connected to the data line (12), the gate line (13), and the pixel electrode (16). The color filter substrate (20) includes a second substrate (21) and a common electrode (22) arranged on the second substrate (21). The common electrode (22) and the pixel electrode (16) have a first overlapping portion (23), which forms a first storage capacitor of the pixel unit (14).