LCD Flicker Suppression via Local Common Voltage Segmentation
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Solution Overview
Problem
LCD panels experience flicker due to parasitic capacitances, which existing solutions attempt to address by increasing storage capacitors, but this compromises pixel aperture ratio and increases material and power costs, making it difficult to meet safety and green product standards.
Innovation Solution
A driving method and circuit that generate multiple common voltages and source signals with different levels to compensate for feed-through voltages, allowing pixels to display the same gray scale image without flicker, thereby improving display quality without increasing costs or power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage capacitor is increased to compensate for voltage disturbance caused by parasitic capacitance, then the flicker problem is reduced, but the pixel aperture ratio is sacrificed and screen brightness decreases
Solution Approach 1:
The patent changes the voltage parameter of the common electrode by providing different common voltages (first common voltage and second common voltage) to different pixels. This parameter change compensates for the voltage disturbance caused by parasitic capacitance without requiring increased storage capacitor capacity, thereby suppressing flicker while maintaining pixel aperture ratio and screen brightness.
Solution Approach 2:
The patent applies different common voltages to different pixels based on their specific parasitic capacitance characteristics. By making the common electrode voltage local rather than uniform, the system compensates for varying voltage disturbances in different pixel regions, effectively suppressing flicker while preserving overall display quality and brightness.
2Reliability
If the storage capacitor is increased to compensate for voltage disturbance, then the flicker problem is reduced, but material cost and power consumption increase
Solution Approach 1:
The patent uses voltage parameter modulation of the common electrode instead of increasing hardware capacitor capacity. This approach suppresses flicker through electrical parameter optimization rather than material escalation, avoiding increased material costs and power consumption while achieving reliable flicker suppression.
3Reliability
If different common voltages are provided to pixels on different scanning lines, then flicker is suppressed, but device complexity increases
Solution Approach 1:
The patent segments the common electrode voltage control by providing different common voltages to different scanning line groups. This segmentation allows flicker suppression to be achieved through controlled voltage differentiation while maintaining a manageable driving circuit architecture, balancing flicker suppression effectiveness with device complexity.
Data Source
AI summary
The present invention relates to a driving method for flicker suppression of a display panel and a driving circuit thereof. The driving circuit includes a source driving circuit and a common voltage generating circuit. The driving method includes driving the source driving circuit to generate at least one first source signal and at least one second source signal, the first source signal corresponds to at least one first pixel on a first scanning line; the second source signal corresponds to at least one second pixel on a second scanning line. The common voltage generating circuit generates at least one common voltage. While driving the first pixel and the second pixel to display the same gray scale image, the first source signal is not equal to the second source signal, or a first common voltage and a second common voltage generated by the common voltage generating circuit are different.