Liquid Crystal Display Driving Method for Flicker Reduction
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Solution Overview
Problem
Existing liquid crystal display devices face challenges in achieving low power consumption and high image quality while maintaining cost-effectiveness, particularly in implementing common inversion drive methods that do not deteriorate image quality or increase manufacturing costs, especially in high-definition displays.
Innovation Solution
A method of driving liquid crystal display devices by applying selection and non-selection potentials to scanning lines, inverting the common electrode between specific potentials, and using capacitive coupling to maintain image signal polarity, allowing for invisible flicker and reduced potential differences between data lines and the common electrode, thereby enabling low-power, high-quality display with reduced manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If common inversion drive is performed to reduce signal amplitude and power consumption, then power consumption decreases, but the polarity inversion can only be performed in one scanning period or one field period, making source inversion drive or dot inversion drive impossible
Solution Approach 1:
The patent segments the common inversion operation into two distinct phases: a first inversion period where the common electrode potential is inverted, and a second inversion period where the common electrode potential is inverted again. This segmentation allows the system to achieve both common inversion benefits (reduced signal amplitude) and dot inversion benefits (improved display quality) within a single frame period, resolving the contradiction between power consumption reduction and inversion drive method flexibility.
2Adaptability or versatility
If patterning of common electrode is performed to enable separate driving of common electrodes, then inversion drive flexibility improves, but additional photolithographic process is required, increasing manufacturing cost
Solution Approach 1:
The patent makes the single common electrode perform multiple functions by sequentially applying different potentials during different time periods. The common electrode first receives a first potential during the first inversion period, then receives a second potential during the second inversion period, enabling both common inversion and dot inversion effects without requiring physical segmentation or additional photolithographic processes, thus maintaining ease of manufacture while achieving driving flexibility.
3Illumination intensity
If gate inversion drive or source inversion drive is used to reduce flicker visibility, then display quality improves, but common inversion drive cannot be simultaneously performed, increasing power consumption
Solution Approach 1:
The patent employs periodic action by alternating between two inversion periods within one frame period. The first inversion period applies common inversion to reduce signal amplitude, while the second inversion period applies dot inversion to eliminate flicker. This periodic alternation allows the system to achieve both low power consumption and high display quality by combining the benefits of different inversion drive methods in a time-multiplexed manner.
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 achieves invisible flicker, high image quality, and low power consumption while maintaining cost-effectiveness, suitable for high-definition displays, by effectively managing potential differences and using a cheap driver IC, thus extending battery life in electronic devices.
Implementation Method 1
using capacitive coupling to maintain image signal polarity, allowing for invisible flicker and reduced potential differences between data lines and the common electrode
Data Source
AI summary
A method of driving a liquid crystal display device includes a plurality of scanning lines, a plurality of data lines arranged to intersect the plurality of scanning lines, a plurality of pixel electrodes arranged in correspondence with the intersections between the plurality of scanning lines and the plurality of data lines, a plurality of pixel switching elements for supplying the signals of the data lines to the pixel electrodes based on the signals of the scanning lines, and an opposed electrode facing the pixel electrodes. The plurality of scanning lines are supplied with respective timings to apply any one of a selection potential and a non-selection potential to the pixel switching elements, the opposed electrode is inversion-driven between a first potential and a second potential, and at least one of the plurality of scanning lines has the selection potential at a common inversion timing when the opposed electrode is inverted from the first potential to the second potential.