Display Panel Driving Method for Flicker Reduction
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Solution Overview
Problem
Liquid crystal display panels experience image flicker due to the high resistivity of common electrodes, which degrades display quality when data voltages of one polarity are applied to pixels connected to gate electrodes.
Innovation Solution
A method of driving a display panel involves applying data signals of alternating polarities to common electrode contact pixels, ensuring equal numbers of pixels receive data signals of each polarity, and alternating the sequence of polarities in specific orders to reduce image flicker.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If data voltages of one polarity are applied to pixels where the common electrode is contacted with the gate electrode, then the switching element can be properly driven, but image flicker is generated and display quality is degraded
Solution Approach 1:
The pixel array is segmented into multiple groups based on the polarity of data voltages applied to them. Common electrode contact pixels are divided into first group (receiving first polarity voltages) and second group (receiving second polarity voltages). This segmentation allows independent control of voltage polarities for different pixel groups, enabling proper switching element driving while preventing image flicker by ensuring balanced voltage distribution.
Solution Approach 2:
Different local regions of the pixel array are assigned different voltage polarity characteristics. Pixels in the first group receive data voltages of first polarity while pixels in the second group receive data voltages of second polarity. This local differentiation ensures that common electrode contact pixels experience balanced electrical stress, maintaining switching element functionality while eliminating the harmful flicker effect.
2Reliability
If the common electrode is contacted with the gate electrode to reduce resistivity, then voltage distribution is improved, but image flicker occurs when single-polarity data voltages are applied
Solution Approach 1:
The data voltage application follows a periodic pattern where first polarity voltages and second polarity voltages are alternately applied to different pixel groups. This periodic voltage switching ensures that common electrode contact pixels experience alternating electrical stress, maintaining good voltage distribution while preventing the accumulation of electrical imbalance that causes image flicker.
Solution Approach 2:
The polarity parameter of data voltages is changed between different pixel groups. First polarity voltages are applied to some common electrode contact pixels while second polarity voltages are applied to others. This parameter change creates a balanced electrical environment at the common electrode-gate electrode contact interface, improving voltage distribution without generating image flicker.
3Object-affected harmful factors
If equal numbers of pixels receive data signals of first and second polarities, then image flicker is reduced, but the control complexity increases
Solution Approach 1:
The pixel array is pre-divided into first and second groups based on their electrical characteristics before voltage application. This preliminary classification allows the control system to automatically assign appropriate polarity voltages to each group without real-time complex calculations, reducing control complexity while ensuring equal representation of polarities to minimize image flicker.
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 approach decreases image flicker and enhances display quality by ensuring balanced voltage application across common electrode contact pixels.
Implementation Method 1
An arrangement of a liquid crystal included in the liquid crystal layer may be changed by the application of an electric field formed by a pixel voltage applied to the pixel electrode and a common voltage applied to the common electrode.
Data Source
AI summary
A method of driving a display panel includes applying gate signals to gate lines of the display panel that extend in a first direction. A plurality of data lines extends in a second direction perpendicular to the first direction. Pixels are defined by an intersection of the gate lines and the data lines. Common electrode contact pixels are provided, in which a common electrode is contacted with a gate electrode extruded from the gate line. A data signal having a first polarity and a data signal having a second polarity, inverse to the first polarity, are applied to an equal number of the common electrode contact pixels.