LCD Panel Brightness Compensation for Parasitic Capacitance Flickering
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Solution Overview
Problem
Liquid crystal display (LCD) panels experience screen flickering due to parasitic capacitance, which affects the uniformity of voltage across pixels, leading to abnormal brightness and reduced display quality.
Innovation Solution
A control method for the display panel that acquires actual and reference brightness parameters, determines a compensated brightness parameter when the difference exceeds a threshold, and adjusts target brightness parameters to mitigate the impact of parasitic capacitance by updating pixel and common voltages, thereby improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bipolar voltage is applied to liquid crystal molecules to prevent damage from long-time fixed electric field, then reliability of liquid crystal display is improved, but parasitic capacitance between gate line and pixel electrode causes voltage inconsistency and screen flickering
Solution Approach 1:
The patent applies preliminary anti-action by introducing a compensation voltage specifically designed to counteract the parasitic capacitance effect before it causes display abnormalities. The compensation voltage is calculated based on the expected parasitic capacitance impact and is applied in advance to the pixel electrode, ensuring that the net voltage remains accurate even when bipolar voltages are applied to the liquid crystal molecules.
Solution Approach 2:
The patent uses an intermediary approach by introducing a compensation voltage as a mediating electrical signal between the data voltage and the actual pixel electrode voltage. This compensation voltage acts as a mediator that balances the parasitic capacitance effect, allowing the main display voltage to maintain its bipolar characteristics for liquid crystal protection while the compensation voltage ensures voltage consistency across pixels.
2Object-generated harmful factors
If compensation voltage is applied to pixel electrode to counteract parasitic capacitance, then screen flickering is reduced, but additional voltage control complexity is introduced
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the compensation voltage parameter based on the data voltage characteristics and parasitic capacitance measurements. The compensation voltage is not a fixed value but is calculated and adjusted according to operating conditions, allowing the system to maintain simplicity while effectively counteracting parasitic capacitance effects across different display scenarios.
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 method effectively reduces abnormal brightness caused by parasitic capacitance, minimizing screen flickering and enhancing the display quality by ensuring consistent brightness across the panel during transitions between forward and reverse bias.
Implementation Method 1
A liquid crystal display (LCD) drives deflection of liquid crystal molecules by applying a voltage across the liquid crystal molecules, to control the degree of polarization of each pixel to achieve the purpose of display.
Implementation Method 2
the parasitic capacitance generated between the gate line and the pixel electrode will cause the voltage value in the pixel electrode to be different from the voltage value in the data line
Data Source
AI summary
A display panel, a control method thereof, and a storage medium are provided. The method includes acquiring a first actual brightness parameter and a first reference brightness parameter at a first position; determining a first compensated brightness parameter at the first position according to the first reference brightness parameter and the first actual brightness parameter if the absolute value of the difference between the first reference brightness parameter and the first actual brightness parameter is not less than a first threshold; and determining a first target brightness parameter at the first position according to the first compensated brightness parameter and a first preset brightness parameter at the first position.