LCD Common Voltage Compensation via Feedback Detection
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Solution Overview
Problem
Liquid Crystal Displays (LCDs) face issues with unstable common voltage due to abrupt changes in coupling capacitors, leading to afterimages and crosstalk, which affect the display effect.
Innovation Solution
A common voltage compensation method and device that includes a common voltage compensation unit and common electrode lines, where the actual common voltage is detected on specific lines and a compensation voltage is provided to stabilize the common voltage across the common electrode, using a voltage feedback line and multiple voltage compensation lines to accurately reflect and transmit the compensation voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If common voltage is provided through multiple common electrode lines, then the common electrode can be uniformly driven, but voltage fluctuations occur due to coupling capacitors formed with gate lines and data lines
Solution Approach 1:
The patent implements a feedback mechanism by detecting the actual common voltage on specific common electrode lines (N1-th to N2-th) and using this detected voltage to generate compensation voltages. The compensation voltage is provided through selected common electrode lines to counteract voltage fluctuations, thereby stabilizing the common electrode voltage despite coupling capacitor effects from gate and data lines.
Solution Approach 2:
The patent changes the parameter of voltage by introducing compensation voltages that are dynamically adjusted based on the detected actual common voltage. The compensation voltage magnitude and distribution are modified according to the detected voltage deviations, allowing the system to adapt to and correct voltage fluctuations caused by coupling capacitors.
2Reliability
If voltage compensation is implemented, then display quality improves by reducing afterimages and crosstalk, but device complexity increases due to additional detection and compensation circuits
Solution Approach 1:
The patent segments the common electrode into multiple sub-electrodes driven by separate common electrode lines (at least three lines). This segmentation allows selective voltage compensation on specific lines rather than uniformly complicating the entire system. The detection and compensation are performed on selected lines (N1-th to N2-th) rather than all lines, reducing overall complexity while maintaining display quality.
Solution Approach 2:
The patent applies local quality by performing voltage detection and compensation on specific common electrode lines (N1-th to N2-th) rather than uniformly treating all lines. This localized approach targets the regions most affected by coupling capacitor effects, improving display quality where needed while avoiding unnecessary complexity in regions where compensation is less critical.
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 method effectively reduces voltage fluctuations, improving the display effect by accurately compensating the common voltage and maintaining stability, thereby reducing afterimages and crosstalk in LCDs.
Implementation Method 1
the voltage feedback line is configured to acquire the actual common voltage on the common electrode line coupled to the voltage feedback line and transmit the acquired actual common voltage to the common voltage compensation unit
Implementation Method 2
the common voltage compensation unit is configured to provide a compensation voltage to at least one of the plurality of common electrode lines to compensate the common voltage of the common electrode
Implementation Method 3
since coupling capacitors are formed by the common electrode and wirings in the LCD, for example, a coupling capacitor is formed by the common electrode and the data line, and a coupling capacitor is formed by the common electrode and the gate line
Data Source
AI summary
The present disclosure provides common voltage compensation method and device for display panel, a display panel, and a display device. The display panel includes a common electrode, a common voltage compensation unit, and common electrode lines. The common electrode lines are sequentially numbered according to a distance from the common voltage compensation unit, a number of the common electrode lines is n, and n is an integer greater than 8. The method includes: the common voltage compensation unit providing common voltage to the common electrode; the common voltage compensation unit detecting actual common voltage on one of N1-th common electrode line to N2-th common electrode line, N1 being a value rounded down from n/8, and N2 being a value rounded down from n/4; the common voltage compensation unit compensating the common voltage of the common electrode according to the detected actual common voltage.