Display Panel Driving Method for Color Shift and Vcom Stability
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Solution Overview
Problem
In vertical alignment liquid crystal display devices, the increase in pixel electrodes to address color shift issues leads to increased metal wires and TFT elements, reducing light transmittance and causing parasitic capacitance imbalances that affect image quality and induce abnormal image outputs.
Innovation Solution
A driving method that divides pixel units into groups, using different voltage levels and polarities to drive sub-pixels, ensuring equal numbers of positive and negative high voltage sub-pixels in each row to prevent Vcom voltage interference and maintain image signal correctness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If pixel electrodes are divided into two independent pixel electrodes to improve color shift, then color shift is improved, but the number of metal wires and TFT elements increases, reducing light transmittance and increasing manufacturing complexity
Solution Approach 1:
The patent segments the pixel units into different groups (first group and second group) and applies different driving voltage strategies to each group. This segmentation allows the system to achieve color shift improvement through voltage differentiation rather than physical electrode multiplication, thereby avoiding the need for additional metal wires and TFT elements while still addressing the color shift issue.
Solution Approach 2:
The patent changes the driving voltage parameters by applying different voltage levels (first driving voltage and second driving voltage with different polarity distributions) to different pixel unit groups. This parameter-based differentiation enables color shift correction without requiring additional physical structures, thus avoiding increased device complexity.
2Device complexity
If two high and low different driving voltage signals are applied to each adjacent two pixel units to avoid increasing metal wires or TFT elements, then device complexity is reduced, but parasitic capacitance imbalance occurs, affecting display color and quality
Solution Approach 1:
The patent divides pixel units into distinct groups (first group and second group) with different driving voltage applications. This segmentation creates a balanced structure where the first group uses a reference driving voltage and the second group uses a modified driving voltage, ensuring that parasitic capacitance effects are compensated and image signal correctness is maintained without reducing device complexity.
Solution Approach 2:
The patent implements a feedback mechanism by comparing the driving voltage applied to the first pixel unit group with the driving voltage applied to the second pixel unit group. The system adjusts the second driving voltage based on the first driving voltage to compensate for parasitic capacitance effects, ensuring accurate image signal output while maintaining simple device structure.
3Ease of manufacture
If driving voltages with mismatched positive and negative high voltage sub-pixels are applied to improve color shift, then color shift is addressed, but Vcom voltage is interfered with, causing abnormal image output
Solution Approach 1:
The patent segments pixel units into first and second groups, where the first group serves as a reference with standard driving voltage and the second group receives adjusted driving voltage. This segmentation isolates the Vcom voltage interference issue to specific groups, allowing the system to maintain overall Vcom stability while still achieving color shift correction in the affected groups.
Solution Approach 2:
The patent changes the driving voltage parameters by applying different polarity distributions to different pixel unit groups. By carefully controlling the voltage parameters and their distribution across groups, the system achieves color shift correction while preventing Vcom voltage interference from causing abnormal image output.
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 prevents Vcom voltage impact from parasitic capacitance, ensuring correct image signals and avoiding color shift or abnormal image quality, while reducing the need for additional metal wires and TFT elements.
Implementation Method 1
liquid crystal molecules maintain certain deflection angles so that light transmittances at different viewing angles are different
Implementation Method 2
due to the influence of parasitic capacitance, in a same row, when the number of sub-pixels with positive high voltages is greater than the number of sub-pixels with negative high voltages, an equivalent voltage of a common voltage Vcom is increased
Data Source
AI summary
A driving method and a driving apparatus of a display panel and a display apparatus are provided. The display panel includes adjacently disposed several first pixel units and several second pixel units. The driving method includes: dividing multiple pixel units of the display panel into multiple pixel unit groups each including adjacent two rows of pixel units; using driving voltages of different voltage levels to drive each sub-pixel of a first pixel unit and each sub-pixel of a second pixel unit; using driving voltages of opposite polarities to drive sub-pixels arranged in a same column in each adjacent two of the pixel unit groups; and using driving voltages with a same polarity distribution to drive adjacent two columns of pixel units of each successively arranged three columns of pixel units in a same pixel unit group.