LCD Data Driver Circuit Compensation Module for Crosstalk Reduction
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Solution Overview
Problem
In liquid crystal displays (LCDs), high resistance in the common electrode can lead to unstable voltage potentials, causing crosstalk and decreased image quality due to parasitic capacitance and resistance variations.
Innovation Solution
A data driver circuit with a compensation module that combines the changed common electrode voltage with the gamma voltage, using a comparator and resistors to generate a compensation voltage, which is then sent to the source driver module to maintain consistent voltage differences across the pixel capacitor, thereby reducing crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high resistance is used in the common electrode, then the voltage stability is improved, but the response time deteriorates
Solution Approach 1:
The patent introduces a feedback mechanism through the compensation module that continuously monitors the common electrode voltage and adjusts the driving voltage accordingly. The feedback signal from the common electrode voltage is combined with the original driving voltage to compensate for potential fluctuations, maintaining both stability and response time performance.
Solution Approach 2:
The patent changes the electrical parameters by introducing a compensation voltage that dynamically adjusts the effective resistance and capacitance characteristics of the common electrode circuit. This parameter change allows the system to maintain voltage stability while improving response time through optimized electrical characteristics.
2Duration of action of stationary object
If parasitic capacitance is increased, then the voltage retention is improved, but the signal integrity deteriorates
Solution Approach 1:
The patent converts the harmful effect of parasitic capacitance into a beneficial feature by using the compensation module to intentionally compensate for voltage changes caused by capacitance. The system acknowledges the parasitic capacitance effect and designs the compensation circuit to counteract it, transforming the harmful capacitance into a manageable and compensated characteristic.
Solution Approach 2:
The compensation module acts as an intermediary between the common electrode and the data driver circuit. It introduces an intermediate compensation voltage that mediates the interaction between the parasitic capacitance and the driving signal, preventing direct harmful effects such as crosstalk while maintaining voltage retention.
3Loss of energy
If the common electrode resistance is increased, then the power consumption is reduced, but the voltage stability deteriorates
Solution Approach 1:
The feedback mechanism in the compensation module continuously monitors the common electrode voltage and adjusts the driving voltage to compensate for any fluctuations. This feedback loop maintains voltage stability even when the common electrode resistance is increased, allowing reduced power consumption without sacrificing stability.
Solution Approach 2:
The compensation module dynamically changes the electrical parameters by introducing a compensation voltage that offsets the voltage drops caused by high resistance. This parameter change allows the system to operate with higher resistance (reducing power consumption) while maintaining stable voltage through active compensation.
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 stabilizes the voltage difference between the pixel and common electrodes, preventing crosstalk and improving image quality by using a compensation module that adjusts the driving voltage in a 1:1 ratio, simplifying logical operations and reducing development complexity.
Implementation Method 1
the compensation module detects and obtains a changed voltage of the common electrode voltage to generate to compensation voltage
Implementation Method 2
A first resistor and a second resistor are connected in series between a grounding end of the data driver circuit and the output end of the comparator
Implementation Method 3
A third resistor is connected in series between a non-inverting input end of the comparator and the common electrode. A fourth resistor is connected in series between the non-inverting input end of the comparator and the gamma voltage
Data Source
AI summary
The present disclosure provides a data driver circuit, a liquid crystal display (LCD) device, and a driving method. The data driver circuit for an LCD panel includes a source driver module, a pixel electrode, a common electrode opposite to the pixel electrode, and a gamma calibration module coupled to the source driver module. The source driver module is coupled to the pixel electrode. The data driver circuit further includes a compensation module. The compensation module detects and obtains a changed voltage of the common electrode voltage to generate a compensation voltage, and combines the compensation voltage and the gamma voltage of the gamma calibration module, then sends the combined voltage to the source driver module. The compensation voltage output by the compensation module and the changed voltage of the common electrode voltage can be mutually counteracted.