Electro-optical Device Driving Method with Adjustable Black Display Voltage
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Solution Overview
Problem
Existing liquid crystal display devices face issues with flicker and burn-in due to residual direct-current voltage components and charge deviations between substrates, despite using inversion driving schemes, as conventional methods fail to fully suppress these issues.
Innovation Solution
A driving method for electro-optical devices that involves alternately supplying positive and negative voltages to pixel electrodes, with a variable ratio of voltage application periods to adjust the counter electrode potential, thereby reducing flicker and burn-in by separately addressing the field-through and electrical characteristic differences between substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inversion driving is performed to suppress direct-current voltage components and charge deviations, then display stability is improved, but residual direct-current voltage components and charge deviations still cause flicker and burn-in
Solution Approach 1:
The patent applies dynamics by making the black display voltage adjustable rather than fixed. The black display voltage can be dynamically changed based on display conditions to optimize the suppression of direct-current voltage components. This dynamic adjustment allows the system to adapt to different scenarios and effectively reduce flicker and burn-in while maintaining display stability.
Solution Approach 2:
The patent changes the parameter of black display voltage from a fixed value to an adjustable parameter. By modifying this voltage parameter, the system can better compensate for residual direct-current voltage components and charge deviations that cause flicker and burn-in, while still benefiting from the stability provided by inversion driving.
2Object-affected harmful factors
If black display voltage is adjusted to suppress direct-current voltage components, then flicker and burn-in are reduced, but display quality may be affected
Solution Approach 1:
The system dynamically adjusts the black display voltage based on actual display conditions rather than using a fixed value. This dynamic approach allows the system to suppress direct-current voltage components effectively while maintaining optimal display quality by adapting to different scenarios.
Solution Approach 2:
The patent implements feedback by monitoring display conditions and adjusting the black display voltage accordingly. This feedback mechanism ensures that the voltage adjustment suppresses harmful direct-current components while maintaining high display quality, as the system continuously adapts based on actual performance.
3Stability of the object's composition
If fixed correction voltage is applied to counter electrode to compensate for field-through phenomenon, then voltage drop is reduced, but display disadvantages still occur due to correlative relationship between correction voltage and driving voltage
Solution Approach 1:
The patent makes the black display voltage dynamic rather than fixed, allowing it to adapt to different driving voltages and display conditions. This dynamic adjustment compensates for the correlative relationship between correction voltage and driving voltage, effectively reducing both pixel electrode voltage drop and display disadvantages like flicker and burn-in.
Solution Approach 2:
The patent changes the black display voltage parameter based on driving conditions. By adjusting this parameter dynamically, the system can compensate for field-through phenomenon while avoiding the display disadvantages that arise from using a fixed correction voltage in relation to varying driving voltages.
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 suppresses flicker and burn-in by adjusting the voltage ratio and counter electrode potential, improving display quality by minimizing direct-current voltage components applied to the liquid crystal layer.
Implementation Method 1
an electro-optical layer interposed between the pixel electrode and the counter electrode
Implementation Method 2
application of a direct-current voltage component to the liquid crystal layer
Data Source
AI summary
A method of driving an electro-optical device having scanning lines, data lines, a switching transistor and a pixel electrode. The device also has an electro-optical layer interposed between the pixel electrode and a counter electrode. The method includes: supplying a data signal alternate between a positive and a negative voltage to the pixel electrode. The positive voltage has a potential greater than a counter electrode potential applied to the counter electrode and the negative voltage is a potential lower than the counter electrode potential; setting the counter electrode potential to reduce a flicker; supplying a first voltage that is either the positive or negative voltage to the pixel electrode in a first period; the other voltage to the pixel electrode in a second period. A ratio of the first period to the second period is variable.