Voltage Regulation Circuit for LCD Panel Crosstalk Elimination
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Solution Overview
Problem
Unstable common electrode voltage in liquid crystal display panels leads to dark lines and crosstalk phenomena due to the presence of alternating current ripples, which affect the display's brightness and gray-scale consistency.
Innovation Solution
A voltage regulation circuit comprising a common voltage generating module, a reverse processing module, and an integration module that processes and regulates the voltage to remove DC components and stabilize the liquid crystal drive voltage, ensuring a consistent difference between the common and pixel voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage follower with resistance and capacitor is used to buffer and filter the common voltage, then the alternating current is removed and the common voltage is stabilized, but the ripple is not completely eliminated and crosstalk phenomenon still occurs
Solution Approach 1:
The patent introduces a feedback mechanism where the output voltage of the voltage follower is detected and fed back to the input through a feedback resistor. This feedback loop allows the circuit to automatically adjust and compensate for ripple voltage, thereby eliminating crosstalk between adjacent pixel rows while maintaining stable common voltage.
Solution Approach 2:
The patent introduces an intermediary feedback path consisting of a feedback resistor that connects the output to the input of the voltage follower. This intermediary element mediates the voltage signal, allowing the circuit to suppress ripple components without affecting the overall voltage buffering function.
2Illumination intensity
If the common electrode is driven with direct current to obtain a stable potential, then the brightness is improved, but alternating current ripples are inevitably present due to incomplete filtering
Solution Approach 1:
The feedback mechanism detects the ripple voltage on the DC common electrode potential and generates a compensating signal through the feedback resistor. This allows the circuit to maintain bright display while automatically suppressing the harmful AC ripple components that would otherwise cause crosstalk.
Solution Approach 2:
The patent converts the harmful AC ripple signal into a useful feedback signal. By feeding back the ripple through the feedback resistor, the circuit generates a compensating voltage that cancels out the harmful ripple, thereby transforming the harmful effect into a beneficial self-correcting mechanism.
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 eliminates crosstalk and maintains a stable liquid crystal drive voltage, enhancing display quality by removing AC ripples and maintaining consistent pixel voltages across adjacent rows.
Implementation Method 1
a DC blocking unit which is used for removing the DC voltage of the first initial voltage inputted by the first input terminal
Implementation Method 2
A common voltage is inputted into an anode input terminal of the voltage follower 14. A output terminal of the voltage follower 14 is grounded through a resistance R and a capacitor C
Implementation Method 3
a capacitor C, for blocking a direct current and for allowing the alternating current to pass through
Data Source
AI summary
A voltage regulation circuit is provided, including a reverse processing module for processing a first initial voltage of a common voltage generating module so as to obtain a reverse voltage of AC voltage; and an integration module for regulating the first initial voltage according to the reverse voltage of the AC voltage so as to make a liquid crystal drive voltage equal to a preset value. The liquid crystal drive voltage is a difference value of between a second initial voltage and the first initial voltage which is regulated.