LCD Sub-Common Electrode Voltage Gradient Compensation
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Solution Overview
Problem
In liquid crystal display panels, voltage offsets caused by parasitic capacitance and resistance lead to inconsistent voltages across pixel electrodes, resulting in image flickers and poor display quality, especially in large-size LCDs.
Innovation Solution
A liquid crystal display panel design featuring a common electrode divided into sub-common electrodes with gradually increasing voltage magnitudes along the gate lines, connected in series by wiring lines with proportional resistance, to compensate for voltage inconsistencies and reduce signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single common electrode is used in the liquid crystal display panel, then the structure is simple and easy to manufacture, but voltage offsets occur in pixel electrodes due to parasitic capacitance and resistance, causing image flickers and poor display quality
Solution Approach 1:
The common electrode is divided into multiple sub-common electrodes (first, second, third, and fourth sub-common electrodes) arranged in different regions of the display panel. Each sub-common electrode can be independently connected to voltage sources, allowing separate voltage control. This segmentation enables compensation for voltage offsets in different regions, eliminating image flickers while maintaining manufacturing feasibility through modular design.
Solution Approach 2:
Different voltages are applied to different sub-common electrodes based on their specific regional requirements. The first and second sub-common electrodes receive first voltages, while the third and fourth sub-common electrodes receive second voltages. This local quality approach allows targeted compensation for voltage offsets in specific regions, improving display quality without requiring complete redesign of the entire electrode system.
2Area of stationary object
If gate signals are transmitted over long gate lines in large-size LCDs, then the display area is increased, but resistance and capacitance cause signal distortion and delay, making voltage offsets inconsistent across pixel electrodes
Solution Approach 1:
The common electrode system is segmented into multiple sub-common electrodes distributed across different regions of the large-size display panel. This segmentation allows each sub-common electrode to be independently voltage-controlled, compensating for the cumulative resistance and capacitance effects in long gate lines. Each region can maintain consistent voltage levels despite the large overall display area.
Solution Approach 2:
Multiple sub-common electrodes act as intermediary elements between the voltage sources and the liquid crystal molecules in different regions. By introducing these intermediate control points, the system can locally adjust voltages to compensate for signal degradation over long gate lines, maintaining voltage consistency across the entire large-size display area.
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 design ensures consistent voltages across pixel electrodes, reducing image flickers and improving display quality by compensating for voltage offsets and minimizing signal interference, thereby enhancing the overall picture quality.
Implementation Method 1
the resistance of the wiring line between two adjacent sub-common electrodes is proportional to the distance between their central points
Implementation Method 2
A liquid crystal display panel implements the display function by controlling the orientation of liquid crystal molecules with an electric field to change the transmissivity of the panel
Implementation Method 3
due to the parasitic capacitance, an offset of ΔVp may take place in the voltage of the pixel electrode before and after its jump
Data Source
AI summary
A liquid crystal display panel and a display device are provided, and in the liquid crystal display panel, a common electrode is divided into a plurality of sub-common electrodes (01) arranged side by side in the extending direction of the gate lines; different common electrode signals are applied to the plurality sub-common electrodes (01), and their voltage magnitudes gradually increase in a transmitting direction of gate signals over the gate lines. Therefore, the inconsistency of the offsets ΔVp in the voltages of individual pixel electrodes in the entire liquid crystal display panel caused by the delay due to resistance and capacitance is compensated for by the voltages on the sub-common electrodes (01), so as to improve the picture quality of the liquid crystal display panel.