Liquid Crystal Panel Driving Voltage Segmentation for Trace Mura
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Solution Overview
Problem
Liquid crystal display panels, such as IPS and FFS, suffer from trace mura phenomena when touched, leading to poor displaying quality due to vertical rotation of liquid crystal molecules, which is not effectively addressed by existing technologies.
Innovation Solution
A method for driving liquid crystal panels involves applying a two-phase driving voltage scheme when the greyscale value is between certain levels, using a lower voltage in the first phase to help liquid crystal molecules resume a horizontal orientation and a higher voltage in the second phase to enhance transmittance, thereby reducing trace mura and improving touch performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a normal driving voltage is applied to drive the data lines for high greyscale values, then the transmittance of the liquid crystal panel is improved, but the liquid crystal molecules rotate vertically causing trace mura when touched
Solution Approach 1:
The driving voltage is segmented into two distinct phases: a first phase with a first driving voltage and a second phase with a second driving voltage. This segmentation allows the system to apply different voltages at different times to achieve both trace mura elimination and high transmittance, resolving the contradiction between these two requirements.
Solution Approach 2:
The first phase with the first driving voltage is applied preliminarily before the second phase. This preliminary action prevents the liquid crystal molecules from rotating vertically in the first place, thereby preventing trace mura formation while maintaining the capability for high transmittance in the subsequent second phase.
2Object-affected harmful factors
If a lower driving voltage is applied to prevent liquid crystal molecules from rotating vertically, then trace mura is reduced, but the transmittance and response speed of the panel decreases
Solution Approach 1:
The driving voltage is applied periodically in two phases: the first phase uses a lower first driving voltage to prevent vertical rotation and trace mura, while the second phase uses a higher second driving voltage to achieve high transmittance. This periodic alternation resolves the contradiction by applying the appropriate voltage at the appropriate time.
Solution Approach 2:
The driving voltage parameter is changed between two phases: a lower first driving voltage in the first phase to prevent trace mura, and a higher second driving voltage in the second phase to enhance transmittance. This dynamic parameter change allows the system to optimize both trace mura prevention and transmittance performance.
3Object-affected harmful factors
If a lower driving voltage is applied to reduce trace mura, then the finger touch phenomenon is improved, but the response speed of the liquid crystal panel becomes slower
Solution Approach 1:
The driving process is segmented into two phases with different voltage levels. The first phase uses a lower first driving voltage to prevent trace mura, while the second phase uses a higher second driving voltage to ensure fast response speed, thus resolving the contradiction between trace mura reduction and response speed maintenance.
Solution Approach 2:
The first phase with the lower first driving voltage is applied preliminarily to prevent vertical rotation and trace mura formation. This preliminary prevention allows the subsequent second phase to use a higher voltage for fast response without suffering from trace mura issues, effectively resolving the speed-trace mura contradiction.
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 approach effectively eliminates trace mura and enhances the performance of liquid crystal display panels by ensuring liquid crystal molecules return to a horizontal orientation upon touch, improving display quality and transmittance.
Implementation Method 1
a first driving voltage is applied to drive the data lines, the first driving voltage being a normal driving voltage corresponding to the greyscale value; and when the greyscale value of the liquid crystal panel is greater than the first grey level and smaller than or equal to a maximum grey level, driving of the data lines is performed with an operation comprising a first phase and a second phase
Data Source
AI summary
Disclosed is a method for driving a liquid crystal panel, which includes: when a greyscale value of the liquid crystal panel is smaller than a first grey level, a first driving voltage that is a normal driving voltage corresponding to the greyscale value is applied to drive the data lines; and when the greyscale value of the liquid crystal panel is greater than the first grey level and smaller than or equal to a maximum grey level, driving of the data lines includes a first phase and a second phase, the first phase being in front of the second phase, the first phase using a second driving voltage smaller than or equal to the first driving voltage to drive the liquid crystal panel, the second phase using a third driving voltage that is a normal driving voltage corresponding to the greyscale value to drive the liquid crystal panel.