Display Substrate Shielding Electrode Coupling Capacitance
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Solution Overview
Problem
Liquid crystal display (LCD) devices with reduced data lines suffer from erroneous vertical lines, reduced transmittance, and aperture ratio due to coupling capacitance issues, affecting image quality.
Innovation Solution
A display substrate design featuring first and second switching elements, pixel electrodes, main and sub-storage electrodes, and specific conductive patterns to reduce coupling capacitance, including a main storage electrode that receives common voltage and a sub-storage electrode partially overlapping with pixel electrodes, which are formed on a base substrate to improve image quality and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the number of data lines is decreased to reduce manufacturing costs, then manufacturing cost is reduced, but coupling capacitance increases causing erroneous vertical lines and degraded image quality
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the data line and the pixel electrode. This shielding electrode acts as a mediator that intercepts and redirects electric field lines, preventing direct coupling capacitance formation between the data line and pixel electrode, thereby eliminating erroneous vertical lines while maintaining the reduced data line configuration
Solution Approach 2:
The harmful coupling capacitance effect is extracted and isolated by introducing a separate shielding electrode structure. The shielding electrode specifically targets and neutralizes the parasitic capacitance between data lines and pixel electrodes, separating the useful signal transmission function from the harmful coupling effect
2Area of stationary object
If the number of gate lines is doubled to drive more pixels, then pixel coverage is improved, but transmittance and aperture ratio are reduced
Solution Approach 1:
The gate line driving scheme transitions from a single-gate-line-per-pixel-row configuration to a dual-gate-line-per-pixel-row configuration, utilizing the vertical dimension more effectively. This dimensional change allows broader pixel coverage while the shielding electrode compensates for the increased gate line density to maintain transmittance
3Reliability
If shielding structures are added to reduce coupling capacitance, then image quality is improved, but device complexity increases
Solution Approach 1:
The shielding electrode serves multiple functions simultaneously: it reduces coupling capacitance between data lines and pixel electrodes, acts as an additional storage electrode to improve pixel voltage stability, and can be integrated with existing gate line structures. This multi-functionality reduces the need for separate components, thereby limiting the increase in device complexity while achieving image quality improvement
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 coupling capacitance-induced vertical lines, enhances image quality, and improves transmittance and aperture ratio in LCD panels with a decreased number of data lines.
Implementation Method 1
A display panel having the pixel structure may generate erroneous vertical lines, which appear as a flicker on the display. The vertical lines may be caused by a coupling capacitance between the data line and the pixel electrode
Implementation Method 2
a liquid crystal layer sequentially disposed between the display substrate and the opposite substrate
Data Source
AI summary
A display substrate includes a first switching element, a second switching element, a first pixel electrode, a second pixel electrode, a main storage electrode and a sub-storage electrode. The first switching element is connected to a data line and a first gate line. The second switching element is connected to the data line and a second gate line adjacent to the first gate line. The first pixel electrode is electrically connected to the first switching element. The second pixel electrode is electrically connected to the second switching element. The main storage electrode is disposed in an area between the first pixel electrode and the second electrode to overlap with first ends of the first and second pixel electrodes. The sub-storage electrode is spaced apart from the first and second gate lines.