Segmented Common Electrode Reduces Kickback in Liquid Crystal Displays
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Solution Overview
Problem
Display panels experience image flickering due to parasitic capacitance between the source and gate of the switching device, leading to deteriorated display quality.
Innovation Solution
A display panel design featuring a common line with a main common electrode, a first common electrode, and a second common electrode, where the electrodes are electrically connected and arranged adjacent to data and scan lines, forming storage capacitors with pixel electrodes to enhance brightness and reduce parasitic capacitance effects, thereby alleviating flicker and improving viewing angle and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional common electrode structure is used, then the device complexity is low, but the image flickering occurs due to parasitic capacitance coupling
Solution Approach 1:
The common electrode is divided into multiple segments (first common electrode adjacent to data lines, second common electrode adjacent to scan lines, and third common electrode in the center). This segmentation allows each segment to serve specific functions: the first and second segments reduce parasitic capacitance coupling from data and scan lines respectively, while the third segment maintains the liquid crystal alignment. This resolves the contradiction by improving display quality through targeted parasitic capacitance reduction while keeping the overall structure manageable through functional division.
Solution Approach 2:
The patent introduces a common electrode structure that acts as an intermediary between the pixel electrode and the external circuit lines (data and scan lines). The common electrode segments positioned adjacent to these lines serve as shielding intermediaries, reducing the direct parasitic capacitance coupling between the signal lines and the pixel electrode. This intermediary structure improves display quality by minimizing kickback effects while maintaining a relatively simple overall device architecture.
2Illumination intensity
If the aperture ratio is increased to improve brightness, then the transmittance increases, but the parasitic capacitance effect worsens due to closer proximity to data lines
Solution Approach 1:
The common electrode is segmented into multiple functional regions, with the first common electrode segment positioned between the pixel electrode and the data lines. This segmentation creates a shielding layer that reduces parasitic capacitance coupling, allowing the pixel electrode to be positioned closer to data lines (increasing aperture ratio) without suffering from excessive parasitic effects. The segmentation enables simultaneous achievement of high brightness and low parasitic capacitance.
Solution Approach 2:
The first common electrode segment acts as an intermediary shielding layer between the pixel electrode and the data lines. This intermediary structure reduces the harmful parasitic capacitance coupling while allowing the pixel electrode to maintain a large area for high aperture ratio and brightness. The intermediary common electrode segment effectively decouples the pixel electrode from the data line interference.
3Object-affected harmful factors
If the pixel electrode area is reduced to minimize parasitic capacitance, then the parasitic capacitance coupling decreases, but the aperture ratio and brightness are compromised
Solution Approach 1:
The common electrode is divided into multiple segments, with the first segment positioned to shield the pixel electrode from data line parasitic capacitance. This segmentation allows the pixel electrode to maintain a large area for high brightness and aperture ratio, while the shielding segment minimizes the parasitic capacitance coupling. The segmentation strategy enables both large pixel electrode area and reduced parasitic effects to coexist.
Solution Approach 2:
The first common electrode segment serves as an intermediary shielding layer that reduces parasitic capacitance coupling between the data lines and the pixel electrode. This intermediary structure allows the pixel electrode to maintain a large area for high brightness without suffering from excessive parasitic effects. The shielding segment effectively protects the large-area pixel electrode from data line interference.
4Object-affected harmful factors
If additional common electrodes are added to reduce kickback, then the parasitic capacitance coupling is reduced, but the device complexity increases
Solution Approach 1:
The common electrode is divided into three functional segments: the first segment adjacent to data lines for reducing data line parasitic capacitance, the second segment adjacent to scan lines for reducing scan line parasitic capacitance, and the third segment in the center for maintaining liquid crystal alignment. This segmentation approach reduces kickback phenomena by targeting specific parasitic capacitance sources while keeping the overall structure relatively simple through clear functional division and integration with the existing common line structure.
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
The solution effectively reduces image flickering, enhances viewing angle, and conserves energy by optimizing the aperture ratio and transmittance of the display panel while maintaining constant transmittance.
Implementation Method 1
the first pixel electrode partially overlaps the first common electrode to form a first storage capacitor; the second pixel electrode partially overlaps the second common electrode to form a second storage capacitor
Data Source
AI summary
The present application discloses a display panel, wherein the driving brightness of a first pixel of the display panel is greater than the original brightness thereof, and a first pixel electrode partially overlaps with a first common electrode; the driving brightness of a second pixel is smaller than the original brightness thereof, and a second pixel electrode partially overlaps with a second common electrode.