Auxiliary Capacitance Electrode Segmentation for Flicker Reduction
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Solution Overview
Problem
The existing liquid crystal display devices using the fringe field switching mode suffer from flicker due to the limitation of only being able to perform line inversion drive, which results in flicker generation.
Innovation Solution
The implementation of a liquid crystal display device with two auxiliary capacitance electrodes per pixel, where each electrode is connected to a different auxiliary capacitance line and configured to apply different potentials, allowing for dot inversion drive and reducing the need for additional auxiliary capacitance lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If line inversion drive is performed by changing potential at the auxiliary capacitance line corresponding to each scanning signal line, then power consumption is reduced, but flicker is generated due to inability to perform dot inversion drive
Solution Approach 1:
The auxiliary capacitance electrode is divided into two separate electrodes (first auxiliary capacitance electrode and second auxiliary capacitance electrode) that can be independently controlled. This segmentation allows different potentials to be applied to different regions within the same pixel, enabling dot inversion drive while maintaining power consumption reduction benefits.
Solution Approach 2:
Different regions within a pixel (first and second auxiliary capacitance electrodes) are assigned different electrical potentials independently. This local quality control enables precise inversion of individual pixels (dot inversion) rather than entire lines, eliminating flicker while maintaining low power consumption.
2Device complexity
If only one auxiliary capacitance line is provided per pixel line, then device complexity is reduced, but only line inversion drive can be performed causing flicker
Solution Approach 1:
The auxiliary capacitance electrode is segmented into two independently controllable electrodes within each pixel, allowing one auxiliary capacitance line to serve multiple functions by controlling different regions with different potentials, thus preventing flicker without increasing line complexity.
Solution Approach 2:
A single auxiliary capacitance line is designed to control two different auxiliary capacitance electrodes within each pixel, enabling both line inversion and dot inversion capabilities through one line, thereby preventing flicker without increasing device complexity.
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 configuration enables dot inversion driving, effectively suppressing flicker and improving display quality by maintaining the same luminance across all pixels at the same gray scale.
Implementation Method 1
a liquid crystal layer containing a plurality of liquid crystal molecules interposed therebetween
Implementation Method 2
liquid crystal molecules having negative anisotropy of dielectric constant
Data Source
AI summary
A liquid crystal display device includes an upper substrate and a lower substrate; and a liquid crystal layer sandwiched between the upper and lower substrates. The lower substrate includes a pixel electrode, a first auxiliary capacitance electrode, and a second auxiliary capacitance electrode for one pixel, and one or two auxiliary capacitance lines for one pixel line including pixels. The two auxiliary capacitive electrodes are electrically connected to different auxiliary capacitance lines. Each of the first auxiliary capacitance electrode and the second auxiliary capacitance electrode and the pixel electrode overlap each other in a plan view. The first auxiliary capacitance electrode and the second auxiliary capacitance electrode differ from each other in shape in a display region of each of the pixels. The shape of the first auxiliary capacitance electrode in a first pixel is identical to the shape of the second auxiliary capacitance electrode in a second pixel adjacent to the first pixel.